<?php  // $Id$

require_once($CFG->libdir.'/filelib.php');

/// CONSTANTS ///////////////////////////////////////////////////////////

define('FORUM_MODE_FLATOLDEST', 1);
define('FORUM_MODE_FLATNEWEST', -1);
define('FORUM_MODE_THREADED', 2);
define('FORUM_MODE_NESTED', 3);

define('FORUM_FORCESUBSCRIBE', 1);
define('FORUM_INITIALSUBSCRIBE', 2);
define('FORUM_DISALLOWSUBSCRIBE',3);

define('FORUM_TRACKING_OFF', 0);
define('FORUM_TRACKING_OPTIONAL', 1);
define('FORUM_TRACKING_ON', 2);

define('FORUM_UNSET_POST_RATING', -999);

define ('FORUM_AGGREGATE_NONE', 0); //no ratings
define ('FORUM_AGGREGATE_AVG', 1);
define ('FORUM_AGGREGATE_COUNT', 2);
define ('FORUM_AGGREGATE_MAX', 3);
define ('FORUM_AGGREGATE_MIN', 4);
define ('FORUM_AGGREGATE_SUM', 5);

/// STANDARD FUNCTIONS ///////////////////////////////////////////////////////////

/**
 * Given an object containing all the necessary data,
 * (defined by the form in mod.html) this function
 * will create a new instance and return the id number
 * of the new instance.
 * @param object $forum add forum instance (with magic quotes)
 * @return int intance id
 */
function forum_add_instance($forum) {
    global $CFG;

    $forum->timemodified = time();

    if (empty($forum->assessed)) {
        $forum->assessed = 0;
    }

    if (empty($forum->ratingtime) or empty($forum->assessed)) {
        $forum->assesstimestart  = 0;
        $forum->assesstimefinish = 0;
    }

    if (!$forum->id = insert_record('forum', $forum)) {
        return false;
    }

    if ($forum->type == 'single') {  // Create related discussion.
        $discussion = new object();
        $discussion->course   = $forum->course;
        $discussion->forum    = $forum->id;
        $discussion->name     = $forum->name;
        $discussion->intro    = $forum->intro;
        $discussion->assessed = $forum->assessed;
        $discussion->format   = $forum->type;
        $discussion->mailnow  = false;
        $discussion->groupid  = -1;

        if (! forum_add_discussion($discussion, $discussion->intro)) {
            error('Could not add the discussion for this forum');
        }
    }

    if ($forum->forcesubscribe == FORUM_INITIALSUBSCRIBE) {
    /// all users should be subscribed initially
    /// Note: forum_get_potential_subscribers should take the forum context,
    /// but that does not exist yet, becuase the forum is only half build at this
    /// stage. However, because the forum is brand new, we know that there are
    /// no role assignments or overrides in the forum context, so using the
    /// course context gives the same list of users.
        $users = forum_get_potential_subscribers(get_context_instance(CONTEXT_COURSE, $forum->course), 0, 'u.id, u.email', '');
        foreach ($users as $user) {
            forum_subscribe($user->id, $forum->id);
        }
    }

    $forum = stripslashes_recursive($forum);
    forum_grade_item_update($forum);

    return $forum->id;
}


/**
 * Given an object containing all the necessary data,
 * (defined by the form in mod.html) this function
 * will update an existing instance with new data.
 * @param object $forum forum instance (with magic quotes)
 * @return bool success
 */
function forum_update_instance($forum) {
    global $USER;

    $forum->timemodified = time();
    $forum->id           = $forum->instance;

    if (empty($forum->assessed)) {
        $forum->assessed = 0;
    }

    if (empty($forum->ratingtime) or empty($forum->assessed)) {
        $forum->assesstimestart  = 0;
        $forum->assesstimefinish = 0;
    }

    $oldforum = get_record('forum', 'id', $forum->id);

    // MDL-3942 - if the aggregation type or scale (i.e. max grade) changes then recalculate the grades for the entire forum
    // if  scale changes - do we need to recheck the ratings, if ratings higher than scale how do we want to respond?
    // for count and sum aggregation types the grade we check to make sure they do not exceed the scale (i.e. max score) when calculating the grade
    if (($oldforum->assessed<>$forum->assessed) or ($oldforum->scale<>$forum->scale)) {
        forum_update_grades($forum); // recalculate grades for the forum
    }

    if ($forum->type == 'single') {  // Update related discussion and post.
        if (! $discussion = get_record('forum_discussions', 'forum', $forum->id)) {
            if ($discussions = get_records('forum_discussions', 'forum', $forum->id, 'timemodified ASC')) {
                notify('Warning! There is more than one discussion in this forum - using the most recent');
                $discussion = array_pop($discussions);
            } else {
                // try to recover by creating initial discussion - MDL-16262
                $discussion = new object();
                $discussion->course   = $forum->course;
                $discussion->forum    = $forum->id;
                $discussion->name     = $forum->name;
                $discussion->intro    = $forum->intro;
                $discussion->assessed = $forum->assessed;
                $discussion->format   = $forum->type;
                $discussion->mailnow  = false;
                $discussion->groupid  = -1;

                forum_add_discussion($discussion, $discussion->intro);

                if (! $discussion = get_record('forum_discussions', 'forum', $forum->id)) {
                    error('Could not add the discussion for this forum');
                }

            }
        }
        if (! $post = get_record('forum_posts', 'id', $discussion->firstpost)) {
            error('Could not find the first post in this forum discussion');
        }

        $post->subject  = $forum->name;
        $post->message  = $forum->intro;
        $post->modified = $forum->timemodified;
        $post->userid   = $USER->id;    // MDL-18599, so that current teacher can take ownership of activities

        if (! update_record('forum_posts', ($post))) {
            error('Could not update the first post');
        }

        $discussion->name = $forum->name;

        if (! update_record('forum_discussions', ($discussion))) {
            error('Could not update the discussion');
        }
    }

    if (!update_record('forum', $forum)) {
        error('Can not update forum');
    }

    $forum = stripslashes_recursive($forum);
    forum_grade_item_update($forum);

    return true;
}


/**
 * Given an ID of an instance of this module,
 * this function will permanently delete the instance
 * and any data that depends on it.
 * @param int forum instance id
 * @return bool success
 */
function forum_delete_instance($id) {

    if (!$forum = get_record('forum', 'id', $id)) {
        return false;
    }

    $result = true;

    if ($discussions = get_records('forum_discussions', 'forum', $forum->id)) {
        foreach ($discussions as $discussion) {
            if (!forum_delete_discussion($discussion, true)) {
                $result = false;
            }
        }
    }

    if (!delete_records('forum_subscriptions', 'forum', $forum->id)) {
        $result = false;
    }

    forum_tp_delete_read_records(-1, -1, -1, $forum->id);

    if (!delete_records('forum', 'id', $forum->id)) {
        $result = false;
    }

    forum_grade_item_delete($forum);

    return $result;
}


/**
 * Function to be run periodically according to the moodle cron
 * Finds all posts that have yet to be mailed out, and mails them
 * out to all subscribers
 * @return void
 */
function forum_cron() {
// (Shirai005): 未送信の要約メールをいつでもユーザプロフィール画面で表示可能（HTML形式）とする改良 (2008/02/01)
// (Shirai005): ここから追加
    global $fsCFG;
    if (isset($fsCFG->unreadforum->displayonly) && $fsCFG->unreadforum->displayonly) $displayOnly = true; else $displayOnly = false;
    if (!fs_function_enable('FS_DISABLE_DISPLAYUNMAILEDFORUMLIST') && $displayOnly) {
        error('This function is disabled now!');
    }
// (Shirai005): ここまで追加
    global $CFG, $USER;

// (Shirai005): ここから追加
// forum_cron()は２部構成．前半はデータベースへの未読フォーラムの登録，後半がそれを読み出してメールを作成／送信．
// したがって未読を随時画面表示する（$displayOnly）では前半の処理は不要．後半の処理のみを行うためにif文で飛ばしてしまう．
    if (!$displayOnly) {
// (Shirai005): ここまで追加
    $cronuser = clone($USER);
    $site = get_site();

    // all users that are subscribed to any post that needs sending
    $users = array();

    // status arrays
    $mailcount  = array();
    $errorcount = array();

    // caches
    $discussions     = array();
    $forums          = array();
    $courses         = array();
    $coursemodules   = array();
    $subscribedusers = array();


    // Posts older than 2 days will not be mailed.  This is to avoid the problem where
    // cron has not been running for a long time, and then suddenly people are flooded
    // with mail from the past few weeks or months
    $timenow   = time();
    $endtime   = $timenow - $CFG->maxeditingtime;
    $starttime = $endtime - 48 * 3600;   // Two days earlier

    if ($posts = forum_get_unmailed_posts($starttime, $endtime, $timenow)) {
        // Mark them all now as being mailed.  It's unlikely but possible there
        // might be an error later so that a post is NOT actually mailed out,
        // but since mail isn't crucial, we can accept this risk.  Doing it now
        // prevents the risk of duplicated mails, which is a worse problem.

        if (!forum_mark_old_posts_as_mailed($endtime)) {
            mtrace('Errors occurred while trying to mark some posts as being mailed.');
            return false;  // Don't continue trying to mail them, in case we are in a cron loop
        }

        // checking post validity, and adding users to loop through later
        foreach ($posts as $pid => $post) {

            $discussionid = $post->discussion;
            if (!isset($discussions[$discussionid])) {
                if ($discussion = get_record('forum_discussions', 'id', $post->discussion)) {
                    $discussions[$discussionid] = $discussion;
                } else {
                    mtrace('Could not find discussion '.$discussionid);
                    unset($posts[$pid]);
                    continue;
                }
            }
            $forumid = $discussions[$discussionid]->forum;
            if (!isset($forums[$forumid])) {
                if ($forum = get_record('forum', 'id', $forumid)) {
                    $forums[$forumid] = $forum;
                } else {
                    mtrace('Could not find forum '.$forumid);
                    unset($posts[$pid]);
                    continue;
                }
            }
            $courseid = $forums[$forumid]->course;
            if (!isset($courses[$courseid])) {
                if ($course = get_record('course', 'id', $courseid)) {
                    $courses[$courseid] = $course;
                } else {
                    mtrace('Could not find course '.$courseid);
                    unset($posts[$pid]);
                    continue;
                }
            }
            if (!isset($coursemodules[$forumid])) {
                if ($cm = get_coursemodule_from_instance('forum', $forumid, $courseid)) {
                    $coursemodules[$forumid] = $cm;
                } else {
                    mtrace('Could not course module for forum '.$forumid);
                    unset($posts[$pid]);
                    continue;
                }
            }


            // caching subscribed users of each forum
            if (!isset($subscribedusers[$forumid])) {
                $modcontext = get_context_instance(CONTEXT_MODULE, $coursemodules[$forumid]->id);
                if ($subusers = forum_subscribed_users($courses[$courseid], $forums[$forumid], 0, $modcontext)) {
                    foreach ($subusers as $postuser) {
                        // do not try to mail users with stopped email
                        if ($postuser->emailstop) {
                            if (!empty($CFG->forum_logblocked)) {
                                add_to_log(SITEID, 'forum', 'mail blocked', '', '', 0, $postuser->id);
                            }
                            continue;
                        }
                        // this user is subscribed to this forum
                        $subscribedusers[$forumid][$postuser->id] = $postuser->id;
                        // this user is a user we have to process later
                        $users[$postuser->id] = $postuser;
                    }
                    unset($subusers); // release memory
                }
            }

            $mailcount[$pid] = 0;
            $errorcount[$pid] = 0;
        }
    }

    if ($users && $posts) {

        $urlinfo = parse_url($CFG->wwwroot);
        $hostname = $urlinfo['host'];

        foreach ($users as $userto) {

            @set_time_limit(120); // terminate if processing of any account takes longer than 2 minutes

            // set this so that the capabilities are cached, and environment matches receiving user
            $USER = $userto;

            mtrace('Processing user '.$userto->id);

            // init caches
            $userto->viewfullnames = array();
            $userto->canpost       = array();
            $userto->markposts     = array();
            $userto->enrolledin    = array();

            // reset the caches
            foreach ($coursemodules as $forumid=>$unused) {
                $coursemodules[$forumid]->cache       = new object();
                $coursemodules[$forumid]->cache->caps = array();
                unset($coursemodules[$forumid]->uservisible);
            }

            foreach ($posts as $pid => $post) {

                // Set up the environment for the post, discussion, forum, course
                $discussion = $discussions[$post->discussion];
                $forum      = $forums[$discussion->forum];
                $course     = $courses[$forum->course];
                $cm         =& $coursemodules[$forum->id];

                // Do some checks  to see if we can bail out now
                if (!isset($subscribedusers[$forum->id][$userto->id])) {
                    continue; // user does not subscribe to this forum
                }

                // Verify user is enrollend in course - if not do not send any email
                if (!isset($userto->enrolledin[$course->id])) {
                    $userto->enrolledin[$course->id] = has_capability('moodle/course:view', get_context_instance(CONTEXT_COURSE, $course->id));
                }
                if (!$userto->enrolledin[$course->id]) {
                    // oops - this user should not receive anything from this course
                    continue;
                }

                // Don't send email if the forum is Q&A and the user has not posted
                if ($forum->type == 'qanda' && !forum_get_user_posted_time($discussion->id, $userto->id)) {
                    mtrace('Did not email '.$userto->id.' because user has not posted in discussion');
                    continue;
                }

                // Get info about the sending user
                if (array_key_exists($post->userid, $users)) { // we might know him/her already
                    $userfrom = $users[$post->userid];
                } else if ($userfrom = get_record('user', 'id', $post->userid)) {
                    $users[$userfrom->id] = $userfrom; // fetch only once, we can add it to user list, it will be skipped anyway
                } else {
                    mtrace('Could not find user '.$post->userid);
                    continue;
                }

                // setup global $COURSE properly - needed for roles and languages
                course_setup($course);   // More environment

                // Fill caches
                if (!isset($userto->viewfullnames[$forum->id])) {
                    $modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);
                    $userto->viewfullnames[$forum->id] = has_capability('moodle/site:viewfullnames', $modcontext);
                }
                if (!isset($userto->canpost[$discussion->id])) {
                    $modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);
                    $userto->canpost[$discussion->id] = forum_user_can_post($forum, $discussion, $userto, $cm, $course, $modcontext);
                }
                if (!isset($userfrom->groups[$forum->id])) {
                    if (!isset($userfrom->groups)) {
                        $userfrom->groups = array();
                        $users[$userfrom->id]->groups = array();
                    }
                    $userfrom->groups[$forum->id] = groups_get_all_groups($course->id, $userfrom->id, $cm->groupingid);
                    $users[$userfrom->id]->groups[$forum->id] = $userfrom->groups[$forum->id];
                }

                // Make sure groups allow this user to see this email
                if ($discussion->groupid > 0 and $groupmode = groups_get_activity_groupmode($cm, $course)) {   // Groups are being used
                    if (!groups_group_exists($discussion->groupid)) { // Can't find group
                        continue;                           // Be safe and don't send it to anyone
                    }

                    if (!groups_is_member($discussion->groupid) and !has_capability('moodle/site:accessallgroups', $modcontext)) {
                        // do not send posts from other groups when in SEPARATEGROUPS or VISIBLEGROUPS
                        continue;
                    }
                }

                // Make sure we're allowed to see it...
                if (!forum_user_can_see_post($forum, $discussion, $post, NULL, $cm)) {
                    mtrace('user '.$userto->id. ' can not see '.$post->id);
                    continue;
                }

                // OK so we need to send the email.

                // Does the user want this post in a digest?  If so postpone it for now.
                if ($userto->maildigest > 0) {
                    // This user wants the mails to be in digest form
                    $queue = new object();
                    $queue->userid       = $userto->id;
                    $queue->discussionid = $discussion->id;
                    $queue->postid       = $post->id;
                    $queue->timemodified = $post->created;
                    if (!insert_record('forum_queue', $queue)) {
                        mtrace("Error: mod/forum/cron.php: Could not queue for digest mail for id $post->id to user $userto->id ($userto->email) .. not trying again.");
                    }
                    continue;
                }


                // Prepare to actually send the post now, and build up the content

                $cleanforumname = str_replace('"', "'", strip_tags(format_string($forum->name)));

                $userfrom->customheaders = array (  // Headers to make emails easier to track
                           'Precedence: Bulk',
                           'List-Id: "'.$cleanforumname.'" <moodleforum'.$forum->id.'@'.$hostname.'>',
                           'List-Help: '.$CFG->wwwroot.'/mod/forum/view.php?f='.$forum->id,
                           'Message-ID: <moodlepost'.$post->id.'@'.$hostname.'>',
                           'X-Course-Id: '.$course->id,
                           'X-Course-Name: '.format_string($course->fullname, true)
                );

                if ($post->parent) {  // This post is a reply, so add headers for threading (see MDL-22551)
                    $userfrom->customheaders[] = 'In-Reply-To: <moodlepost'.$post->parent.'@'.$hostname.'>';
                    $userfrom->customheaders[] = 'References: <moodlepost'.$post->parent.'@'.$hostname.'>';
                }

                $postsubject = "$course->shortname: ".format_string($post->subject,true);
                $posttext = forum_make_mail_text($course, $forum, $discussion, $post, $userfrom, $userto);
                $posthtml = forum_make_mail_html($course, $forum, $discussion, $post, $userfrom, $userto);

                // Send the post now!

                mtrace('Sending ', '');

                if (!$mailresult = email_to_user($userto, $userfrom, $postsubject, $posttext,
                                                 $posthtml, '', '', $CFG->forum_replytouser)) {
                    mtrace("Error: mod/forum/cron.php: Could not send out mail for id $post->id to user $userto->id".
                         " ($userto->email) .. not trying again.");
                    add_to_log($course->id, 'forum', 'mail error', "discuss.php?d=$discussion->id#p$post->id",
                               substr(format_string($post->subject,true),0,30), $cm->id, $userto->id);
                    $errorcount[$post->id]++;
                } else if ($mailresult === 'emailstop') {
                    // should not be reached anymore - see check above
                } else {
                    $mailcount[$post->id]++;

                // Mark post as read if forum_usermarksread is set off
                    if (!$CFG->forum_usermarksread) {
                        $userto->markposts[$post->id] = $post->id;
                    }
                }

                mtrace('post '.$post->id. ': '.$post->subject);
            }

            // mark processed posts as read
            forum_tp_mark_posts_read($userto, $userto->markposts);
        }
    }

    if ($posts) {
        foreach ($posts as $post) {
            mtrace($mailcount[$post->id]." users were sent post $post->id, '$post->subject'");
            if ($errorcount[$post->id]) {
                set_field("forum_posts", "mailed", "2", "id", "$post->id");
            }
        }
    }

    // release some memory
    unset($subscribedusers);
    unset($mailcount);
    unset($errorcount);

    $USER = clone($cronuser);
    course_setup(SITEID);

    $sitetimezone = $CFG->timezone;

    // Now see if there are any digest mails waiting to be sent, and if we should send them

    mtrace('Starting digest processing...');

    @set_time_limit(300); // terminate if not able to fetch all digests in 5 minutes

    if (!isset($CFG->digestmailtimelast)) {    // To catch the first time
        set_config('digestmailtimelast', 0);
    }

// (Shirai005): ここから追加
// if (!$displayOnly) に対応するカッコ
    } else {
        // $displayOnlyをtrueとした場合のための後半部の初期設定
        $posthtml = null;
        $site = get_site();
        $sitetimezone = $CFG->timezone;
        @set_time_limit(300); // terminate if not able to fetch all digests in 5 minutes
    }
// (Shirai005): ここまで追加
    $timenow = time();
// (Shirai005): ここから追加
    if (!$displayOnly) {
// (Shirai005): ここまで追加
    $digesttime = usergetmidnight($timenow, $sitetimezone) + ($CFG->digestmailtime * 3600);

    // Delete any really old ones (normally there shouldn't be any)
    $weekago = $timenow - (7 * 24 * 3600);
    delete_records_select('forum_queue', "timemodified < $weekago");
    mtrace ('Cleaned old digest records');
// (Shirai005): ここから追加
    } else {
        $weekago    = $timenow - (7 * 24 * 3600);
        $digesttime = $timenow;
    }
// (Shirai005): ここまで追加

// (Shirai005): ここから修正
//  if ($CFG->digestmailtimelast < $digesttime and $timenow > $digesttime) {
    if (($CFG->digestmailtimelast < $digesttime and $timenow > $digesttime) || ($displayOnly)) {
// (Shirai005): ここまで修正

// (Shirai005): ここから追加
        if (!$displayOnly) {
// (Shirai005): ここまで追加
        mtrace('Sending forum digests: '.userdate($timenow, '', $sitetimezone));
// (Shirai005): ここから追加
        }
// (Shirai005): ここまで追加

        $digestposts_rs = get_recordset_select('forum_queue', "timemodified < $digesttime");

        if (!rs_EOF($digestposts_rs)) {

            // We have work to do
            $usermailcount = 0;

            //caches - reuse the those filled before too
            $discussionposts = array();
            $userdiscussions = array();

            while ($digestpost = rs_fetch_next_record($digestposts_rs)) {
                if (!isset($users[$digestpost->userid])) {
                    if ($user = get_record('user', 'id', $digestpost->userid)) {
                        $users[$digestpost->userid] = $user;
                    } else {
                        continue;
                    }
                }
// (Shirai005): ここから追加
                if (!$displayOnly) {
// (Shirai005): ここまで追加
                $postuser = $users[$digestpost->userid];
                if ($postuser->emailstop) {
                    if (!empty($CFG->forum_logblocked)) {
                        add_to_log(SITEID, 'forum', 'mail blocked', '', '', 0, $postuser->id);
                    }
                    continue;
                }
// (Shirai005): ここから追加
                }
// (Shirai005): ここまで追加

                if (!isset($posts[$digestpost->postid])) {
                    if ($post = get_record('forum_posts', 'id', $digestpost->postid)) {
                        $posts[$digestpost->postid] = $post;
                    } else {
                        continue;
                    }
                }
                $discussionid = $digestpost->discussionid;
                if (!isset($discussions[$discussionid])) {
                    if ($discussion = get_record('forum_discussions', 'id', $discussionid)) {
                        $discussions[$discussionid] = $discussion;
                    } else {
                        continue;
                    }
                }
                $forumid = $discussions[$discussionid]->forum;
                if (!isset($forums[$forumid])) {
                    if ($forum = get_record('forum', 'id', $forumid)) {
                        $forums[$forumid] = $forum;
                    } else {
                        continue;
                    }
                }

                $courseid = $forums[$forumid]->course;
                if (!isset($courses[$courseid])) {
                    if ($course = get_record('course', 'id', $courseid)) {
                        $courses[$courseid] = $course;
                    } else {
                        continue;
                    }
                }

                if (!isset($coursemodules[$forumid])) {
                    if ($cm = get_coursemodule_from_instance('forum', $forumid, $courseid)) {
                        $coursemodules[$forumid] = $cm;
                    } else {
                        continue;
                    }
                }
                $userdiscussions[$digestpost->userid][$digestpost->discussionid] = $digestpost->discussionid;
                $discussionposts[$digestpost->discussionid][$digestpost->postid] = $digestpost->postid;
            }
            rs_close($digestposts_rs); /// Finished iteration, let's close the resultset

            // Data collected, start sending out emails to each user
            foreach ($userdiscussions as $userid => $thesediscussions) {
// (Shirai005): ここから追加
                if ($displayOnly) {
                    if ($userid != $USER->id) continue;
                    $userto = $USER;
                    if (isset($fsCFG->unreadforum->maildigest) && ($fsCFG->unreadforum->maildigest >= 0)) $userto->maildigest = $fsCFG->unreadforum->maildigest;
                }
// (Shirai005): ここまで追加

                @set_time_limit(120); // terminate if processing of any account takes longer than 2 minutes

// (Shirai005): ここから追加
                if (!$displayOnly) {
// (Shirai005): ここまで追加
                $USER = $cronuser;
                course_setup(SITEID); // reset cron user language, theme and timezone settings

                mtrace(get_string('processingdigest', 'forum', $userid), '... ');

                // First of all delete all the queue entries for this user
                delete_records_select('forum_queue', "userid = $userid AND timemodified < $digesttime");
                $userto = $users[$userid];

                // Override the language and timezone of the "current" user, so that
                // mail is customised for the receiver.
                $USER = $userto;
                course_setup(SITEID);
// (Shirai005): ここから追加
                }
// (Shirai005): ここまで追加

                // init caches
                $userto->viewfullnames = array();
                $userto->canpost       = array();
                $userto->markposts     = array();

                $postsubject = get_string('digestmailsubject', 'forum', format_string($site->shortname, true));

                $headerdata = new object();
                $headerdata->sitename = format_string($site->fullname, true);
                $headerdata->userprefs = $CFG->wwwroot.'/user/edit.php?id='.$userid.'&amp;course='.$site->id;

                $posttext = get_string('digestmailheader', 'forum', $headerdata)."\n\n";
                $headerdata->userprefs = '<a target="_blank" href="'.$headerdata->userprefs.'">'.get_string('digestmailprefs', 'forum').'</a>';

                $posthtml = "<head>";
                foreach ($CFG->stylesheets as $stylesheet) {
                    $posthtml .= '<link rel="stylesheet" type="text/css" href="'.$stylesheet.'" />'."\n";
                }
                $posthtml .= "</head>\n<body id=\"email\">\n";
                $posthtml .= '<p>'.get_string('digestmailheader', 'forum', $headerdata).'</p><br /><hr size="1" noshade="noshade" />';

// (Shirai170): フォーラム投稿のダイジェストメール内のディスカッショントピックスの並び順を整列させる改良 (2009/10/01)
// (Shirai170): ここから追加
                if (count($thesediscussions) >= 3) {
                    // ディスカッショントピックス３つ以上の場合のみソートの意味がある．
                    $cfd = array();
                    foreach ($thesediscussions as $discussionid) {
                        $discussion = $discussions[$discussionid];
                        $forum      = $forums[$discussion->forum];
                        $course     = $courses[$forum->course];
                        $cfd[$course->id][$forum->id][$discussionid] = $discussionid;
                    }
                    // キーでソート
                    $thesediscussions = array();
                    ksort($cfd);
                    foreach ($cfd as $cfd_forums) {
                        ksort($cfd_forums);
                        foreach ($cfd_forums as $cfd_discussions) {
                            ksort($cfd_discussions);
                            foreach ($cfd_discussions as $cfd_discussion) {
                                $thesediscussions[$cfd_discussion] = $cfd_discussion;
                            }
                        }
                    }
                }
// (Shirai170): ここまで追加
                foreach ($thesediscussions as $discussionid) {

                    @set_time_limit(120);   // to be reset for each post

                    $discussion = $discussions[$discussionid];
                    $forum      = $forums[$discussion->forum];
                    $course     = $courses[$forum->course];
                    $cm         = $coursemodules[$forum->id];

                    //override language
                    course_setup($course);

                    // Fill caches
                    if (!isset($userto->viewfullnames[$forum->id])) {
                        $modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);
                        $userto->viewfullnames[$forum->id] = has_capability('moodle/site:viewfullnames', $modcontext);
                    }
                    if (!isset($userto->canpost[$discussion->id])) {
                        $modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);
                        $userto->canpost[$discussion->id] = forum_user_can_post($forum, $discussion, $userto, $cm, $course, $modcontext);
                    }

                    $strforums      = get_string('forums', 'forum');
                    $canunsubscribe = ! forum_is_forcesubscribed($forum);
                    $canreply       = $userto->canpost[$discussion->id];

                    $posttext .= "\n \n";
                    $posttext .= '=====================================================================';
                    $posttext .= "\n \n";
                    $posttext .= "$course->shortname -> $strforums -> ".format_string($forum->name,true);
                    if ($discussion->name != $forum->name) {
                        $posttext  .= " -> ".format_string($discussion->name,true);
                    }
                    $posttext .= "\n";

                    $posthtml .= "<p><font face=\"sans-serif\">".
                    "<a target=\"_blank\" href=\"$CFG->wwwroot/course/view.php?id=$course->id\">$course->shortname</a> -> ".
                    "<a target=\"_blank\" href=\"$CFG->wwwroot/mod/forum/index.php?id=$course->id\">$strforums</a> -> ".
                    "<a target=\"_blank\" href=\"$CFG->wwwroot/mod/forum/view.php?f=$forum->id\">".format_string($forum->name,true)."</a>";
                    if ($discussion->name == $forum->name) {
                        $posthtml .= "</font></p>";
                    } else {
                        $posthtml .= " -> <a target=\"_blank\" href=\"$CFG->wwwroot/mod/forum/discuss.php?d=$discussion->id\">".format_string($discussion->name,true)."</a></font></p>";
                    }
                    $posthtml .= '<p>';

                    $postsarray = $discussionposts[$discussionid];
                    sort($postsarray);

                    foreach ($postsarray as $postid) {
                        $post = $posts[$postid];

                        if (array_key_exists($post->userid, $users)) { // we might know him/her already
                            $userfrom = $users[$post->userid];
                        } else if ($userfrom = get_record('user', 'id', $post->userid)) {
                            $users[$userfrom->id] = $userfrom; // fetch only once, we can add it to user list, it will be skipped anyway
                        } else {
                            mtrace('Could not find user '.$post->userid);
                            continue;
                        }

                        if (!isset($userfrom->groups[$forum->id])) {
                            if (!isset($userfrom->groups)) {
                                $userfrom->groups = array();
                                $users[$userfrom->id]->groups = array();
                            }
                            $userfrom->groups[$forum->id] = groups_get_all_groups($course->id, $userfrom->id, $cm->groupingid);
                            $users[$userfrom->id]->groups[$forum->id] = $userfrom->groups[$forum->id];
                        }

                        $userfrom->customheaders = array ("Precedence: Bulk");

                        if ($userto->maildigest == 2) {
                            // Subjects only
                            $by = new object();
                            $by->name = fullname($userfrom);
                            $by->date = userdate($post->modified);
                            $posttext .= "\n".format_string($post->subject,true).' '.get_string("bynameondate", "forum", $by);
                            $posttext .= "\n---------------------------------------------------------------------";

                            $by->name = "<a target=\"_blank\" href=\"$CFG->wwwroot/user/view.php?id=$userfrom->id&amp;course=$course->id\">$by->name</a>";
                            $posthtml .= '<div><a target="_blank" href="'.$CFG->wwwroot.'/mod/forum/discuss.php?d='.$discussion->id.'#p'.$post->id.'">'.format_string($post->subject,true).'</a> '.get_string("bynameondate", "forum", $by).'</div>';

                        } else {
                            // The full treatment
                            $posttext .= forum_make_mail_text($course, $forum, $discussion, $post, $userfrom, $userto, true);
                            $posthtml .= forum_make_mail_post($course, $forum, $discussion, $post, $userfrom, $userto, false, $canreply, true, false);

// (Shirai005): ここから追加
                            if (!$displayOnly) {
// (Shirai005): ここまで追加
                        // Create an array of postid's for this user to mark as read.
                            if (!$CFG->forum_usermarksread) {
                                $userto->markposts[$post->id] = $post->id;
                            }
// (Shirai005): ここから追加
                            }
// (Shirai005): ここまで追加
                        }
                    }
                    if ($canunsubscribe) {
                        $posthtml .= "\n<div class='mdl-right'><font size=\"1\"><a href=\"$CFG->wwwroot/mod/forum/subscribe.php?id=$forum->id\">".get_string("unsubscribe", "forum")."</a></font></div>";
                    } else {
                        $posthtml .= "\n<div class='mdl-right'><font size=\"1\">".get_string("everyoneissubscribed", "forum")."</font></div>";
                    }
                    $posthtml .= '<hr size="1" noshade="noshade" /></p>';
                }
                $posthtml .= '</body>';
// (Shirai005): ここから追加
                if ($displayOnly) echo $posthtml;
                    else {
// (Shirai005): ここまで追加

                if ($userto->mailformat != 1) {
                    // This user DOESN'T want to receive HTML
                    $posthtml = '';
                }

                if (!$mailresult =  email_to_user($userto, $site->shortname, $postsubject, $posttext, $posthtml,
                                                  '', '', $CFG->forum_replytouser)) {
                    mtrace("ERROR!");
                    echo "Error: mod/forum/cron.php: Could not send out digest mail to user $userto->id ($userto->email)... not trying again.\n";
                    add_to_log($course->id, 'forum', 'mail digest error', '', '', $cm->id, $userto->id);
                } else if ($mailresult === 'emailstop') {
                    // should not happen anymore - see check above
                } else {
                    mtrace("success.");
                    $usermailcount++;

                    // Mark post as read if forum_usermarksread is set off
                    forum_tp_mark_posts_read($userto, $userto->markposts);
                }
// (Shirai005): ここから追加
                }
// (Shirai005): ここまで追加
            }
        }
// (Shirai005): ここから追加
        if (!$displayOnly) {
// (Shirai005): ここまで追加
    /// We have finishied all digest emails, update $CFG->digestmailtimelast
        set_config('digestmailtimelast', $timenow);
// (Shirai005): ここから追加
        } else {
            if ($posthtml == null) {
                echo get_string('thereisnounmailedpost', 'fs_moodle').'<BR>';
                if ($USER->emailstop)       echo get_string('needtoactivateemail', 'fs_moodle').'<BR>';
                if ($USER->maildigest == 0) echo get_string('needtosetemaildigesttype', 'fs_moodle').'<BR>';
            }

            echo '<Form><Input type="button" value="'.get_string('closewindow').'" onClick="javascript:window.close();"></Form>';  // (2008/08/11追加)
            die;    // ($displayOnly == true)の場合はここで処理を全て終了する．
        }
// (Shirai005): ここまで追加
    }

    $USER = $cronuser;
    course_setup(SITEID); // reset cron user language, theme and timezone settings

    if (!empty($usermailcount)) {
        mtrace(get_string('digestsentusers', 'forum', $usermailcount));
    }

    if (!empty($CFG->forum_lastreadclean)) {
        $timenow = time();
        if ($CFG->forum_lastreadclean + (24*3600) < $timenow) {
            set_config('forum_lastreadclean', $timenow);
            mtrace('Removing old forum read tracking info...');
            forum_tp_clean_read_records();
        }
    } else {
        set_config('forum_lastreadclean', time());
    }


    return true;
}

/**
 * Builds and returns the body of the email notification in plain text.
 *
 * @param object $course
 * @param object $forum
 * @param object $discussion
 * @param object $post
 * @param object $userfrom
 * @param object $userto
 * @param boolean $bare
 * @return string The email body in plain text format.
 */
function forum_make_mail_text($course, $forum, $discussion, $post, $userfrom, $userto, $bare = false) {
    global $CFG, $USER;

    if (!isset($userto->viewfullnames[$forum->id])) {
        if (!$cm = get_coursemodule_from_instance('forum', $forum->id, $course->id)) {
            error('Course Module ID was incorrect');
        }
        $modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);
        $viewfullnames = has_capability('moodle/site:viewfullnames', $modcontext, $userto->id);
    } else {
        $viewfullnames = $userto->viewfullnames[$forum->id];
    }

    if (!isset($userto->canpost[$discussion->id])) {
        $modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);
        $canreply = forum_user_can_post($forum, $discussion, $userto, $cm, $course, $modcontext);
    } else {
        $canreply = $userto->canpost[$discussion->id];
    }

    $by = New stdClass;
    $by->name = fullname($userfrom, $viewfullnames);
    $by->date = userdate($post->modified, "", $userto->timezone);

    $strbynameondate = get_string('bynameondate', 'forum', $by);

    $strforums = get_string('forums', 'forum');

    $canunsubscribe = ! forum_is_forcesubscribed($forum);

    $posttext = '';

    if (!$bare) {
        $posttext  = "$course->shortname -> $strforums -> ".format_string($forum->name,true);

        if ($discussion->name != $forum->name) {
            $posttext  .= " -> ".format_string($discussion->name,true);
        }
    }

    $posttext .= "\n---------------------------------------------------------------------\n";
    $posttext .= format_string($post->subject,true);
    if ($bare) {
        $posttext .= " ($CFG->wwwroot/mod/forum/discuss.php?d=$discussion->id#p$post->id)";
    }
    $posttext .= "\n".$strbynameondate."\n";
    $posttext .= "---------------------------------------------------------------------\n";
    $posttext .= format_text_email(trusttext_strip($post->message), $post->format);
    $posttext .= "\n\n";
    if ($post->attachment) {
        $post->course = $course->id;
        $post->forum = $forum->id;
        $posttext .= forum_print_attachments($post, "text");
    }
    if (!$bare && $canreply) {
        $posttext .= "---------------------------------------------------------------------\n";
        $posttext .= get_string("postmailinfo", "forum", $course->shortname)."\n";
        $posttext .= "$CFG->wwwroot/mod/forum/post.php?reply=$post->id\n";
    }
    if (!$bare && $canunsubscribe) {
        $posttext .= "\n---------------------------------------------------------------------\n";
        $posttext .= get_string("unsubscribe", "forum");
        $posttext .= ": $CFG->wwwroot/mod/forum/subscribe.php?id=$forum->id\n";
    }

    return $posttext;
}

/**
 * Builds and returns the body of the email notification in html format.
 *
 * @param object $course
 * @param object $forum
 * @param object $discussion
 * @param object $post
 * @param object $userfrom
 * @param object $userto
 * @return string The email text in HTML format
 */
function forum_make_mail_html($course, $forum, $discussion, $post, $userfrom, $userto) {
    global $CFG;

    if ($userto->mailformat != 1) {  // Needs to be HTML
        return '';
    }

    if (!isset($userto->canpost[$discussion->id])) {
        $canreply = forum_user_can_post($forum, $discussion, $userto);
    } else {
        $canreply = $userto->canpost[$discussion->id];
    }

    $strforums = get_string('forums', 'forum');
    $canunsubscribe = ! forum_is_forcesubscribed($forum);

    $posthtml = '<head>';
    foreach ($CFG->stylesheets as $stylesheet) {
        $posthtml .= '<link rel="stylesheet" type="text/css" href="'.$stylesheet.'" />'."\n";
    }
    $posthtml .= '</head>';
    $posthtml .= "\n<body id=\"email\">\n\n";

    $posthtml .= '<div class="navbar">'.
    '<a target="_blank" href="'.$CFG->wwwroot.'/course/view.php?id='.$course->id.'">'.$course->shortname.'</a> &raquo; '.
    '<a target="_blank" href="'.$CFG->wwwroot.'/mod/forum/index.php?id='.$course->id.'">'.$strforums.'</a> &raquo; '.
    '<a target="_blank" href="'.$CFG->wwwroot.'/mod/forum/view.php?f='.$forum->id.'">'.format_string($forum->name,true).'</a>';
    if ($discussion->name == $forum->name) {
        $posthtml .= '</div>';
    } else {
        $posthtml .= ' &raquo; <a target="_blank" href="'.$CFG->wwwroot.'/mod/forum/discuss.php?d='.$discussion->id.'">'.
                     format_string($discussion->name,true).'</a></div>';
    }
    $posthtml .= forum_make_mail_post($course, $forum, $discussion, $post, $userfrom, $userto, false, $canreply, true, false);

    if ($canunsubscribe) {
        $posthtml .= '<hr /><div class="mdl-align unsubscribelink">
                      <a href="'.$CFG->wwwroot.'/mod/forum/subscribe.php?id='.$forum->id.'">'.get_string('unsubscribe', 'forum').'</a>&nbsp;
                      <a href="'.$CFG->wwwroot.'/mod/forum/unsubscribeall.php">'.get_string('unsubscribeall', 'forum').'</a></div>';
    }

    $posthtml .= '</body>';

    return $posthtml;
}


/**
 *
 * @param object $course
 * @param object $user
 * @param object $mod TODO this is not used in this function, refactor
 * @param object $forum
 * @return object A standard object with 2 variables: info (number of posts for this user) and time (last modified)
 */
function forum_user_outline($course, $user, $mod, $forum) {
    global $CFG;
    require_once("$CFG->libdir/gradelib.php");
    $grades = grade_get_grades($course->id, 'mod', 'forum', $forum->id, $user->id);
    if (empty($grades->items[0]->grades)) {
        $grade = false;
    } else {
        $grade = reset($grades->items[0]->grades);
    }

    $count = forum_count_user_posts($forum->id, $user->id);

    if ($count && $count->postcount > 0) {
        $result = new object();
        $result->info = get_string("numposts", "forum", $count->postcount);
        $result->time = $count->lastpost;
        if ($grade) {
            $result->info .= ', ' . get_string('grade') . ': ' . $grade->str_long_grade;
        }
        return $result;
    } else if ($grade) {
        $result = new object();
        $result->info = get_string('grade') . ': ' . $grade->str_long_grade;

        //datesubmitted == time created. dategraded == time modified or time overridden
        //if grade was last modified by the user themselves use date graded. Otherwise use date submitted
        if ($grade->usermodified == $user->id || empty($grade->datesubmitted)) {
            $result->time = $grade->dategraded;
        } else {
            $result->time = $grade->datesubmitted;
        }

        return $result;
    }
    return NULL;
}


/**
 *
 */
function forum_user_complete($course, $user, $mod, $forum) {
    global $CFG,$USER;
    require_once("$CFG->libdir/gradelib.php");

    $grades = grade_get_grades($course->id, 'mod', 'forum', $forum->id, $user->id);
    if (!empty($grades->items[0]->grades)) {
        $grade = reset($grades->items[0]->grades);
        echo '<p>'.get_string('grade').': '.$grade->str_long_grade.'</p>';
        if ($grade->str_feedback) {
            echo '<p>'.get_string('feedback').': '.$grade->str_feedback.'</p>';
        }
    }

    if ($posts = forum_get_user_posts($forum->id, $user->id)) {

        if (!$cm = get_coursemodule_from_instance('forum', $forum->id, $course->id)) {
            error('Course Module ID was incorrect');
        }
        $discussions = forum_get_user_involved_discussions($forum->id, $user->id);

        // preload all user ratings for these discussions - one query only and minimal memory
        $cm->cache->ratings = array();
        $cm->cache->myratings = array();
        if ($postratings = forum_get_all_user_ratings($user->id, $discussions)) {
            foreach ($postratings as $pr) {
                if (!isset($cm->cache->ratings[$pr->postid])) {
                    $cm->cache->ratings[$pr->postid] = array();
                }
                $cm->cache->ratings[$pr->postid][$pr->id] = $pr->rating;

                if ($pr->userid == $USER->id) {
                    $cm->cache->myratings[$pr->postid] = $pr->rating;
                }
            }
            unset($postratings);
        }

        foreach ($posts as $post) {
            if (!isset($discussions[$post->discussion])) {
                continue;
            }
            $discussion = $discussions[$post->discussion];
            
            $ratings = null;

            if ($forum->assessed) {
                if ($scale = make_grades_menu($forum->scale)) {
                    $ratings =new object();
                    $ratings->scale = $scale;
                    $ratings->assesstimestart = $forum->assesstimestart;
                    $ratings->assesstimefinish = $forum->assesstimefinish;
                    $ratings->allow = false;
                }
            }

            forum_print_post($post, $discussion, $forum, $cm, $course, false, false, false, $ratings);

        }
    } else {
        echo "<p>".get_string("noposts", "forum")."</p>";
    }
}


/**
 *
 */
function forum_print_overview($courses,&$htmlarray) {
    global $USER, $CFG;
    //$LIKE = sql_ilike();//no longer using like in queries. MDL-20578

    if (empty($courses) || !is_array($courses) || count($courses) == 0) {
        return array();
    }

    if (!$forums = get_all_instances_in_courses('forum',$courses)) {
        return;
    }


    // get all forum logs in ONE query (much better!)
    $sql = "SELECT instance,cmid,l.course,COUNT(l.id) as count FROM {$CFG->prefix}log l "
        ." JOIN {$CFG->prefix}course_modules cm ON cm.id = cmid "
        ." WHERE (";
    foreach ($courses as $course) {
        $sql .= '(l.course = '.$course->id.' AND l.time > '.$course->lastaccess.') OR ';
    }
    $sql = substr($sql,0,-3); // take off the last OR

    $sql .= ") AND l.module = 'forum' AND action = 'add post' "
        ." AND userid != ".$USER->id." GROUP BY cmid,l.course,instance";

    if (!$new = get_records_sql($sql)) {
        $new = array(); // avoid warnings
    }

    // also get all forum tracking stuff ONCE.
    $trackingforums = array();
    foreach ($forums as $forum) {
        if (forum_tp_can_track_forums($forum)) {
            $trackingforums[$forum->id] = $forum;
        }
    }

    if (count($trackingforums) > 0) {
        $cutoffdate = isset($CFG->forum_oldpostdays) ? (time() - ($CFG->forum_oldpostdays*24*60*60)) : 0;
        $sql = 'SELECT d.forum,d.course,COUNT(p.id) AS count '.
            ' FROM '.$CFG->prefix.'forum_posts p '.
            ' JOIN '.$CFG->prefix.'forum_discussions d ON p.discussion = d.id '.
            ' LEFT JOIN '.$CFG->prefix.'forum_read r ON r.postid = p.id AND r.userid = '.$USER->id.' WHERE (';
        foreach ($trackingforums as $track) {
            $sql .= '(d.forum = '.$track->id.' AND (d.groupid = -1 OR d.groupid = 0 OR d.groupid = '.get_current_group($track->course).')) OR ';
        }
        $sql = substr($sql,0,-3); // take off the last OR
        $sql .= ') AND p.modified >= '.$cutoffdate.' AND r.id is NULL GROUP BY d.forum,d.course';

        if (!$unread = get_records_sql($sql)) {
            $unread = array();
        }
    } else {
        $unread = array();
    }

    if (empty($unread) and empty($new)) {
        return;
    }

    $strforum = get_string('modulename','forum');
    $strnumunread = get_string('overviewnumunread','forum');
    $strnumpostssince = get_string('overviewnumpostssince','forum');

    foreach ($forums as $forum) {
        $str = '';
        $count = 0;
        $thisunread = 0;
        $showunread = false;
        // either we have something from logs, or trackposts, or nothing.
        if (array_key_exists($forum->id, $new) && !empty($new[$forum->id])) {
            $count = $new[$forum->id]->count;
        }
        if (array_key_exists($forum->id,$unread)) {
            $thisunread = $unread[$forum->id]->count;
            $showunread = true;
        }
        if ($count > 0 || $thisunread > 0) {
            $str .= '<div class="overview forum"><div class="name">'.$strforum.': <a title="'.$strforum.'" href="'.$CFG->wwwroot.'/mod/forum/view.php?f='.$forum->id.'">'.
                $forum->name.'</a></div>';
            $str .= '<div class="info">';
            $str .= $count.' '.$strnumpostssince;
            if (!empty($showunread)) {
                $str .= '<br />'.$thisunread .' '.$strnumunread;
            }
            $str .= '</div></div>';
        }
        if (!empty($str)) {
            if (!array_key_exists($forum->course,$htmlarray)) {
                $htmlarray[$forum->course] = array();
            }
            if (!array_key_exists('forum',$htmlarray[$forum->course])) {
                $htmlarray[$forum->course]['forum'] = ''; // initialize, avoid warnings
            }
            $htmlarray[$forum->course]['forum'] .= $str;
        }
    }
}

/**
 * Given a course and a date, prints a summary of all the new
 * messages posted in the course since that date
 * @param object $course
 * @param bool $viewfullnames capability
 * @param int $timestart
 * @return bool success
 */
function forum_print_recent_activity($course, $viewfullnames, $timestart) {
    global $CFG, $USER;

    // do not use log table if possible, it may be huge and is expensive to join with other tables

    if (!$posts = get_records_sql("SELECT p.*, f.type AS forumtype, d.forum, d.groupid,
                                          d.timestart, d.timeend, d.userid AS duserid,
                                          u.firstname, u.lastname, u.email, u.picture
                                     FROM {$CFG->prefix}forum_posts p
                                          JOIN {$CFG->prefix}forum_discussions d ON d.id = p.discussion
                                          JOIN {$CFG->prefix}forum f             ON f.id = d.forum
                                          JOIN {$CFG->prefix}user u              ON u.id = p.userid
                                    WHERE p.created > $timestart AND f.course = {$course->id}
                                 ORDER BY p.id ASC")) { // order by initial posting date
         return false;
    }

    $modinfo =& get_fast_modinfo($course);

    $groupmodes = array();
    $cms    = array();

    $strftimerecent = get_string('strftimerecent');

    $printposts = array();
    foreach ($posts as $post) {
        if (!isset($modinfo->instances['forum'][$post->forum])) {
            // not visible
            continue;
        }
        $cm = $modinfo->instances['forum'][$post->forum];
        if (!$cm->uservisible) {
            continue;
        }
        $context = get_context_instance(CONTEXT_MODULE, $cm->id);

        if (!has_capability('mod/forum:viewdiscussion', $context)) {
            continue;
        }

        if (!empty($CFG->forum_enabletimedposts) and $USER->id != $post->duserid
          and (($post->timestart > 0 and $post->timestart > time()) or ($post->timeend > 0 and $post->timeend < time()))) {
            if (!has_capability('mod/forum:viewhiddentimedposts', $context)) {
                continue;
            }
        }

        $groupmode = groups_get_activity_groupmode($cm, $course);

        if ($groupmode) {
            if ($post->groupid == -1 or $groupmode == VISIBLEGROUPS or has_capability('moodle/site:accessallgroups', $context)) {
                // oki (Open discussions have groupid -1)
            } else {
                // separate mode
                if (isguestuser()) {
                    // shortcut
                    continue;
                }

                if (is_null($modinfo->groups)) {
                    $modinfo->groups = groups_get_user_groups($course->id); // load all my groups and cache it in modinfo
                }

                if (!array_key_exists($post->groupid, $modinfo->groups[0])) {
                    continue;
                }
            }
        }

        $printposts[] = $post;
    }
    unset($posts);

    if (!$printposts) {
        return false;
    }

    print_headline(get_string('newforumposts', 'forum').':', 3);
    echo "\n<ul class='unlist'>\n";

    foreach ($printposts as $post) {
        $subjectclass = empty($post->parent) ? ' bold' : '';

        echo '<li><div class="head">'.
               '<div class="date">'.userdate($post->modified, $strftimerecent).'</div>'.
               '<div class="name">'.fullname($post, $viewfullnames).'</div>'.
             '</div>';
        echo '<div class="info'.$subjectclass.'">';
        if (empty($post->parent)) {
            echo '"<a href="'.$CFG->wwwroot.'/mod/forum/discuss.php?d='.$post->discussion.'">';
        } else {
            echo '"<a href="'.$CFG->wwwroot.'/mod/forum/discuss.php?d='.$post->discussion.'&amp;parent='.$post->parent.'#p'.$post->id.'">';
        }
        $post->subject = break_up_long_words(format_string($post->subject, true));
        echo $post->subject;
        echo "</a>\"</div></li>\n";
    }

    echo "</ul>\n";

    return true;
}

/**
 * Return grade for given user or all users.
 *
 * @param int $forumid id of forum
 * @param int $userid optional user id, 0 means all users
 * @return array array of grades, false if none
 */
function forum_get_user_grades($forum, $userid=0) {
    global $CFG;

    $user = $userid ? "AND u.id = $userid" : "";

    $aggtype = $forum->assessed;
    switch ($aggtype) {
        case FORUM_AGGREGATE_COUNT :
            $sql = "SELECT u.id, u.id AS userid, COUNT(fr.rating) AS rawgrade
                      FROM {$CFG->prefix}user u, {$CFG->prefix}forum_posts fp,
                           {$CFG->prefix}forum_ratings fr, {$CFG->prefix}forum_discussions fd
                     WHERE u.id = fp.userid AND fp.discussion = fd.id AND fr.post = fp.id
                           AND fr.userid != u.id AND fd.forum = $forum->id
                           $user
                  GROUP BY u.id";
            break;
        case FORUM_AGGREGATE_MAX :
            $sql = "SELECT u.id, u.id AS userid, MAX(fr.rating) AS rawgrade
                      FROM {$CFG->prefix}user u, {$CFG->prefix}forum_posts fp,
                           {$CFG->prefix}forum_ratings fr, {$CFG->prefix}forum_discussions fd
                     WHERE u.id = fp.userid AND fp.discussion = fd.id AND fr.post = fp.id
                           AND fr.userid != u.id AND fd.forum = $forum->id
                           $user
                  GROUP BY u.id";
            break;
        case FORUM_AGGREGATE_MIN :
            $sql = "SELECT u.id, u.id AS userid, MIN(fr.rating) AS rawgrade
                      FROM {$CFG->prefix}user u, {$CFG->prefix}forum_posts fp,
                           {$CFG->prefix}forum_ratings fr, {$CFG->prefix}forum_discussions fd
                     WHERE u.id = fp.userid AND fp.discussion = fd.id AND fr.post = fp.id
                           AND fr.userid != u.id AND fd.forum = $forum->id
                           $user
                  GROUP BY u.id";
            break;
        case FORUM_AGGREGATE_SUM :
            $sql = "SELECT u.id, u.id AS userid, SUM(fr.rating) AS rawgrade
                     FROM {$CFG->prefix}user u, {$CFG->prefix}forum_posts fp,
                          {$CFG->prefix}forum_ratings fr, {$CFG->prefix}forum_discussions fd
                    WHERE u.id = fp.userid AND fp.discussion = fd.id AND fr.post = fp.id
                          AND fr.userid != u.id AND fd.forum = $forum->id
                          $user
                 GROUP BY u.id";
            break;
        default : //avg
            $sql = "SELECT u.id, u.id AS userid, AVG(fr.rating) AS rawgrade
                      FROM {$CFG->prefix}user u, {$CFG->prefix}forum_posts fp,
                           {$CFG->prefix}forum_ratings fr, {$CFG->prefix}forum_discussions fd
                     WHERE u.id = fp.userid AND fp.discussion = fd.id AND fr.post = fp.id
                           AND fr.userid != u.id AND fd.forum = $forum->id
                           $user
                  GROUP BY u.id";
            break;
    }

    if ($results = get_records_sql($sql)) {
        // it could throw off the grading if count and sum returned a rawgrade higher than scale
        // so to prevent it we review the results and ensure that rawgrade does not exceed the scale, if it does we set rawgrade = scale (i.e. full credit)
        foreach ($results as $rid=>$result) {
            if ($forum->scale >= 0) {
                //numeric
                if ($result->rawgrade > $forum->scale) {
                    $results[$rid]->rawgrade = $forum->scale;
                }
            } else {
                //scales
                if ($scale = get_record('scale', 'id', -$forum->scale)) {
                    $scale = explode(',', $scale->scale);
                    $max = count($scale);
                    if ($result->rawgrade > $max) {
                        $results[$rid]->rawgrade = $max;
                    }
                }
            }
        }
    }

    return $results;
}

/**
 * Update grades by firing grade_updated event
 *
 * @param object $forum null means all forums
 * @param int $userid specific user only, 0 mean all
 * @param boolean $nullifnone return null if grade does not exist
 * @return void
 */
function forum_update_grades($forum=null, $userid=0, $nullifnone=true) {
    global $CFG;

    if ($forum != null) {
        require_once($CFG->libdir.'/gradelib.php');
        if ($grades = forum_get_user_grades($forum, $userid)) {
            forum_grade_item_update($forum, $grades);

        } else if ($userid and $nullifnone) {
            $grade = new object();
            $grade->userid   = $userid;
            $grade->rawgrade = NULL;
            forum_grade_item_update($forum, $grade);

        } else {
            forum_grade_item_update($forum);
        }

    } else {
        $sql = "SELECT f.*, cm.idnumber as cmidnumber
                  FROM {$CFG->prefix}forum f, {$CFG->prefix}course_modules cm, {$CFG->prefix}modules m
                 WHERE m.name='forum' AND m.id=cm.module AND cm.instance=f.id";
        if ($rs = get_recordset_sql($sql)) {
            while ($forum = rs_fetch_next_record($rs)) {
                if ($forum->assessed) {
                    forum_update_grades($forum, 0, false);
                } else {
                    forum_grade_item_update($forum);
                }
            }
            rs_close($rs);
        }
    }
}

/**
 * Create/update grade item for given forum
 *
 * @param object $forum object with extra cmidnumber
 * @param mixed optional array/object of grade(s); 'reset' means reset grades in gradebook
 * @return int 0 if ok
 */
function forum_grade_item_update($forum, $grades=NULL) {
    global $CFG;
    if (!function_exists('grade_update')) { //workaround for buggy PHP versions
        require_once($CFG->libdir.'/gradelib.php');
    }

    $params = array('itemname'=>$forum->name, 'idnumber'=>$forum->cmidnumber);

    if (!$forum->assessed or $forum->scale == 0) {
        $params['gradetype'] = GRADE_TYPE_NONE;

    } else if ($forum->scale > 0) {
        $params['gradetype'] = GRADE_TYPE_VALUE;
        $params['grademax']  = $forum->scale;
        $params['grademin']  = 0;

    } else if ($forum->scale < 0) {
        $params['gradetype'] = GRADE_TYPE_SCALE;
        $params['scaleid']   = -$forum->scale;
    }

    if ($grades  === 'reset') {
        $params['reset'] = true;
        $grades = NULL;
    }

    return grade_update('mod/forum', $forum->course, 'mod', 'forum', $forum->id, 0, $grades, $params);
}

/**
 * Delete grade item for given forum
 *
 * @param object $forum object
 * @return object grade_item
 */
function forum_grade_item_delete($forum) {
    global $CFG;
    require_once($CFG->libdir.'/gradelib.php');

    return grade_update('mod/forum', $forum->course, 'mod', 'forum', $forum->id, 0, NULL, array('deleted'=>1));
}


/**
 * Returns the users with data in one forum
 * (users with records in forum_subscriptions, forum_posts and forum_ratings, students)
 * @param int $forumid
 * @return mixed array or false if none
 */
function forum_get_participants($forumid) {

    global $CFG;

    //Get students from forum_subscriptions
    $st_subscriptions = get_records_sql("SELECT DISTINCT u.id, u.id
                                         FROM {$CFG->prefix}user u,
                                              {$CFG->prefix}forum_subscriptions s
                                         WHERE s.forum = '$forumid' and
                                               u.id = s.userid");
    //Get students from forum_posts
    $st_posts = get_records_sql("SELECT DISTINCT u.id, u.id
                                 FROM {$CFG->prefix}user u,
                                      {$CFG->prefix}forum_discussions d,
                                      {$CFG->prefix}forum_posts p
                                 WHERE d.forum = '$forumid' and
                                       p.discussion = d.id and
                                       u.id = p.userid");

    //Get students from forum_ratings
    $st_ratings = get_records_sql("SELECT DISTINCT u.id, u.id
                                   FROM {$CFG->prefix}user u,
                                        {$CFG->prefix}forum_discussions d,
                                        {$CFG->prefix}forum_posts p,
                                        {$CFG->prefix}forum_ratings r
                                   WHERE d.forum = '$forumid' and
                                         p.discussion = d.id and
                                         r.post = p.id and
                                         u.id = r.userid");

    //Add st_posts to st_subscriptions
    if ($st_posts) {
        foreach ($st_posts as $st_post) {
            $st_subscriptions[$st_post->id] = $st_post;
        }
    }
    //Add st_ratings to st_subscriptions
    if ($st_ratings) {
        foreach ($st_ratings as $st_rating) {
            $st_subscriptions[$st_rating->id] = $st_rating;
        }
    }
    //Return st_subscriptions array (it contains an array of unique users)
    return ($st_subscriptions);
}

/**
 * This function returns if a scale is being used by one forum
 * @param int $forumid
 * @param int $scaleid negative number
 * @return bool
 */
function forum_scale_used ($forumid,$scaleid) {

    $return = false;

    $rec = get_record("forum","id","$forumid","scale","-$scaleid");

    if (!empty($rec) && !empty($scaleid)) {
        $return = true;
    }

    return $return;
}

/**
 * Checks if scale is being used by any instance of forum
 *
 * This is used to find out if scale used anywhere
 * @param $scaleid int
 * @return boolean True if the scale is used by any forum
 */
function forum_scale_used_anywhere($scaleid) {
    if ($scaleid and record_exists('forum', 'scale', -$scaleid)) {
        return true;
    } else {
        return false;
    }
}

// SQL FUNCTIONS ///////////////////////////////////////////////////////////

/**
 * Gets a post with all info ready for forum_print_post
 * Most of these joins are just to get the forum id
 * @param int $postid
 * @return mixed array of posts or false
 */
function forum_get_post_full($postid) {
    global $CFG;

    return get_record_sql("SELECT p.*, d.forum, u.firstname, u.lastname, u.email, u.picture, u.imagealt
                             FROM {$CFG->prefix}forum_posts p
                                  JOIN {$CFG->prefix}forum_discussions d ON p.discussion = d.id
                                  LEFT JOIN {$CFG->prefix}user u ON p.userid = u.id
                            WHERE p.id = '$postid'");
}

/**
 * Gets posts with all info ready for forum_print_post
 * We pass forumid in because we always know it so no need to make a
 * complicated join to find it out.
 * @return mixed array of posts or false
 */
function forum_get_discussion_posts($discussion, $sort, $forumid) {
    global $CFG;

    return get_records_sql("SELECT p.*, $forumid AS forum, u.firstname, u.lastname, u.email, u.picture, u.imagealt
                              FROM {$CFG->prefix}forum_posts p
                         LEFT JOIN {$CFG->prefix}user u ON p.userid = u.id
                             WHERE p.discussion = $discussion
                               AND p.parent > 0 $sort");
}

/**
 * Gets all posts in discussion including top parent.
 * @param int $discussionid
 * @param string $sort
 * @param bool $tracking does user track the forum?
 * @return array of posts
 */
function forum_get_all_discussion_posts($discussionid, $sort, $tracking=false) {
    global $CFG, $USER;

    $tr_sel  = "";
    $tr_join = "";

    if ($tracking) {
        $now = time();
        $cutoffdate = $now - ($CFG->forum_oldpostdays * 24 * 3600);
        $tr_sel  = ", fr.id AS postread";
        $tr_join = "LEFT JOIN {$CFG->prefix}forum_read fr ON (fr.postid = p.id AND fr.userid = $USER->id)";
    }

    if (!$posts = get_records_sql("SELECT p.*, u.firstname, u.lastname, u.email, u.picture, u.imagealt $tr_sel
                                     FROM {$CFG->prefix}forum_posts p
                                          LEFT JOIN {$CFG->prefix}user u ON p.userid = u.id
                                          $tr_join
                                    WHERE p.discussion = $discussionid
                                 ORDER BY $sort")) {
        return array();
    }

    foreach ($posts as $pid=>$p) {
        if ($tracking) {
            if (forum_tp_is_post_old($p)) {
                 $posts[$pid]->postread = true;
            }
        }
        if (!$p->parent) {
            continue;
        }
        if (!isset($posts[$p->parent])) {
            continue; // parent does not exist??
        }
        if (!isset($posts[$p->parent]->children)) {
            $posts[$p->parent]->children = array();
        }
        $posts[$p->parent]->children[$pid] =& $posts[$pid];
    }

    return $posts;
}

/**
 * Gets posts with all info ready for forum_print_post
 * We pass forumid in because we always know it so no need to make a
 * complicated join to find it out.
 */
function forum_get_child_posts($parent, $forumid) {
    global $CFG;

    return get_records_sql("SELECT p.*, $forumid AS forum, u.firstname, u.lastname, u.email, u.picture, u.imagealt
                              FROM {$CFG->prefix}forum_posts p
                         LEFT JOIN {$CFG->prefix}user u ON p.userid = u.id
                             WHERE p.parent = '$parent'
                          ORDER BY p.created ASC");
}
// (Shirai118): フォーラム投稿のサーチ機能を強化するいくつかの機能拡張 (2009/02/12)
// (Shirai118): ここから追加
function forum_get_discussion_post_id($child) {
    global $CFG;

    return get_records_sql("SELECT p.discussion
                              FROM {$CFG->prefix}forum_posts p
                             WHERE p.id = '$child'");
}
// (Shirai118): ここまで追加

/**
 * An array of forum objects that the user is allowed to read/search through.
 * @param $userid
 * @param $courseid - if 0, we look for forums throughout the whole site.
 * @return array of forum objects, or false if no matches
 *         Forum objects have the following attributes:
 *         id, type, course, cmid, cmvisible, cmgroupmode, accessallgroups,
 *         viewhiddentimedposts
 */
function forum_get_readable_forums($userid, $courseid=0) {

    global $CFG, $USER;
    require_once($CFG->dirroot.'/course/lib.php');

    if (!$forummod = get_record('modules', 'name', 'forum')) {
        error('The forum module is not installed');
    }

    if ($courseid) {
        $courses = get_records('course', 'id', $courseid);
    } else {
        // If no course is specified, then the user can see SITE + his courses.
        // And admins can see all courses, so pass the $doanything flag enabled
        $courses1 = get_records('course', 'id', SITEID);
        $courses2 = get_my_courses($userid, null, null, true);
        $courses = array_merge($courses1, $courses2);
    }
    if (!$courses) {
        return array();
    }

    $readableforums = array();

    foreach ($courses as $course) {

        $modinfo =& get_fast_modinfo($course);
        if (is_null($modinfo->groups)) {
            $modinfo->groups = groups_get_user_groups($course->id, $userid);
        }

        if (empty($modinfo->instances['forum'])) {
            // hmm, no forums?
            continue;
        }

        $courseforums = get_records('forum', 'course', $course->id);

        foreach ($modinfo->instances['forum'] as $forumid => $cm) {
            if (!$cm->uservisible or !isset($courseforums[$forumid])) {
                continue;
            }
            $context = get_context_instance(CONTEXT_MODULE, $cm->id);
            $forum = $courseforums[$forumid];
            $forum->context = $context;
            $forum->cm = $cm;

            if (!has_capability('mod/forum:viewdiscussion', $context)) {
                continue;
            }

         /// group access
            if (groups_get_activity_groupmode($cm, $course) == SEPARATEGROUPS and !has_capability('moodle/site:accessallgroups', $context)) {
                if (is_null($modinfo->groups)) {
                    $modinfo->groups = groups_get_user_groups($course->id, $USER->id);
                }
                if (empty($CFG->enablegroupings)) {
                    $forum->onlygroups = $modinfo->groups[0];
                    $forum->onlygroups[] = -1;
                } else if (isset($modinfo->groups[$cm->groupingid])) {
                    $forum->onlygroups = $modinfo->groups[$cm->groupingid];
                    $forum->onlygroups[] = -1;
                } else {
                    $forum->onlygroups = array(-1);
                }
            }

        /// hidden timed discussions
            $forum->viewhiddentimedposts = true;
            if (!empty($CFG->forum_enabletimedposts)) {
                if (!has_capability('mod/forum:viewhiddentimedposts', $context)) {
                    $forum->viewhiddentimedposts = false;
                }
            }

        /// qanda access
            if ($forum->type == 'qanda'
                    && !has_capability('mod/forum:viewqandawithoutposting', $context)) {

                // We need to check whether the user has posted in the qanda forum.
                $forum->onlydiscussions = array();  // Holds discussion ids for the discussions
                                                    // the user is allowed to see in this forum.
                if ($discussionspostedin = forum_discussions_user_has_posted_in($forum->id, $USER->id)) {
                    foreach ($discussionspostedin as $d) {
                        $forum->onlydiscussions[] = $d->id;
                    }
                }
            }

            $readableforums[$forum->id] = $forum;
        }

        unset($modinfo);

    } // End foreach $courses

    //print_object($courses);
    //print_object($readableforums);

    return $readableforums;
}

/**
 * Returns a list of posts found using an array of search terms.
 * @param $searchterms - array of search terms, e.g. word +word -word
 * @param $courseid - if 0, we search through the whole site
 * @param $page
 * @param $recordsperpage=50
 * @param &$totalcount
 * @param $extrasql
 * @return array of posts found
 */
function forum_search_posts($searchterms, $courseid=0, $limitfrom=0, $limitnum=50,
                            &$totalcount, $extrasql='') {
    global $CFG, $USER;
    require_once($CFG->libdir.'/searchlib.php');

    $forums = forum_get_readable_forums($USER->id, $courseid);

    if (count($forums) == 0) {
        $totalcount = 0;
        return false;
    }

    $now = round(time(), -2); // db friendly

    $fullaccess = array();
    $where = array();

    foreach ($forums as $forumid => $forum) {
        $select = array();

        if (!$forum->viewhiddentimedposts) {
            $select[] = "(d.userid = {$USER->id} OR (d.timestart < $now AND (d.timeend = 0 OR d.timeend > $now)))";
        }

        $cm = $forum->cm;
        $context = $forum->context;

        if ($forum->type == 'qanda'
            && !has_capability('mod/forum:viewqandawithoutposting', $context)) {
            if (!empty($forum->onlydiscussions)) {
                $discussionsids = implode(',', $forum->onlydiscussions);
                $select[] = "(d.id IN ($discussionsids) OR p.parent = 0)";
            } else {
                $select[] = "p.parent = 0";
            }
        }

        if (!empty($forum->onlygroups)) {
            $groupids = implode(',', $forum->onlygroups);
            $select[] = "d.groupid IN ($groupids)";
        }

        if ($select) {
            $selects = implode(" AND ", $select);
            $where[] = "(d.forum = $forumid AND $selects)";
        } else {
            $fullaccess[] = $forumid;
        }
    }

    if ($fullaccess) {
        $fullids = implode(',', $fullaccess);
        $where[] = "(d.forum IN ($fullids))";
    }

    $selectdiscussion = "(".implode(" OR ", $where).")";

    // Some differences SQL
    $LIKE = sql_ilike();
    $NOTLIKE = 'NOT ' . $LIKE;
    if ($CFG->dbfamily == 'postgres') {
        $REGEXP = '~*';
        $NOTREGEXP = '!~*';
    } else {
        $REGEXP = 'REGEXP';
        $NOTREGEXP = 'NOT REGEXP';
    }

    $messagesearch = '';
    $searchstring = '';

    // Need to concat these back together for parser to work.
    foreach($searchterms as $searchterm){
// (Shirai118): フォーラム投稿のサーチ機能を強化するいくつかの機能拡張 (2009/02/12)に拡張
// (Shirai118): ここから追加
        if (strncasecmp($searchterm, 'ratingmin:', 10) == 0) {
            $ratingmin = substr($searchterm, 10);
            continue;
        }
// (Shirai118): ここまで追加
        if ($searchstring != '') {
            $searchstring .= ' ';
        }
        $searchstring .= $searchterm;
    }

    // We need to allow quoted strings for the search. The quotes *should* be stripped
    // by the parser, but this should be examined carefully for security implications.
    $searchstring = str_replace("\\\"","\"",$searchstring);
    $parser = new search_parser();
    $lexer = new search_lexer($parser);

    if ($lexer->parse($searchstring)) {
        $parsearray = $parser->get_parsed_array();
    // Experimental feature under 1.8! MDL-8830
    // Use alternative text searches if defined
    // This feature only works under mysql until properly implemented for other DBs
    // Requires manual creation of text index for forum_posts before enabling it:
    // CREATE FULLTEXT INDEX foru_post_tix ON [prefix]forum_posts (subject, message)
    // Experimental feature under 1.8! MDL-8830
        if (!empty($CFG->forum_usetextsearches)) {
            $messagesearch = search_generate_text_SQL($parsearray, 'p.message', 'p.subject',
                                                 'p.userid', 'u.id', 'u.firstname',
                                                 'u.lastname', 'p.modified', 'd.forum');
        } else {
            $messagesearch = search_generate_SQL($parsearray, 'p.message', 'p.subject',
                                                 'p.userid', 'u.id', 'u.firstname',
                                                 'u.lastname', 'p.modified', 'd.forum');
        }
    }

// (Shirai118): フォーラム投稿のサーチ機能を強化するいくつかの機能拡張 (2009/02/12)
// (Shirai118): ここからコメントアウト
//  $fromsql = "{$CFG->prefix}forum_posts p,
//                {$CFG->prefix}forum_discussions d,
//                {$CFG->prefix}user u";
// (Shirai118): ここから追加
    if (empty($ratingmin)) {
        $fromsql = "{$CFG->prefix}forum_posts p,
                      {$CFG->prefix}forum_discussions d,
                      {$CFG->prefix}user u";
    } else {
        $fromsql = "{$CFG->prefix}forum_posts p,
                      {$CFG->prefix}forum_ratings r,
                      {$CFG->prefix}forum_discussions d,
                      {$CFG->prefix}user u";
        $extrasql .= "AND (p.id = r.post
               AND     r.rating >= $ratingmin)";
    }
// (Shirai118): ここまで追加

    $selectsql = " $messagesearch
               AND p.discussion = d.id
               AND p.userid = u.id
               AND $selectdiscussion
                   $extrasql";

    $countsql = "SELECT COUNT(*)
                   FROM $fromsql
                  WHERE $selectsql";

    $searchsql = "SELECT p.*,
                         d.forum,
                         u.firstname,
                         u.lastname,
                         u.email,
                         u.picture,
                         u.imagealt
                    FROM $fromsql
                   WHERE $selectsql
                ORDER BY p.modified DESC";

    $totalcount = count_records_sql($countsql);

    return get_records_sql($searchsql, $limitfrom, $limitnum);
}

/**
 * Returns a list of ratings for all posts in discussion
 * @param object $discussion
 * @return array of ratings or false
 */
function forum_get_all_discussion_ratings($discussion) {
    global $CFG;
    return get_records_sql("SELECT r.id, r.userid, p.id AS postid, r.rating
                              FROM {$CFG->prefix}forum_ratings r,
                                   {$CFG->prefix}forum_posts p
                             WHERE r.post = p.id AND p.discussion = $discussion->id
                             ORDER BY p.id ASC");
}

/**
 * Returns a list of ratings for one specific user for all posts in discussion
 * @global object $CFG
 * @param object $discussions the discussions for which we return all ratings
 * @param int $userid the user for who we return all ratings
 * @return object
 */
function forum_get_all_user_ratings($userid, $discussions) {
    global $CFG;


    foreach ($discussions as $discussion) {
     if (!isset($discussionsid)){
         $discussionsid = $discussion->id;
     }
     else {
         $discussionsid .= ",".$discussion->id;
     }
    }

    $sql = "SELECT r.id, r.userid, p.id AS postid, r.rating
                              FROM {$CFG->prefix}forum_ratings r,
                                   {$CFG->prefix}forum_posts p
                             WHERE r.post = p.id AND p.userid = $userid";
    //postgres compability
    if (!isset($discussionsid)) {
       $sql .=" AND p.discussion IN (".$discussionsid.")";
    }
    $sql .=" ORDER BY p.id ASC";

    return get_records_sql($sql);
    

}

/**
 * Returns a list of ratings for a particular post - sorted.
 * @param int $postid
 * @param string $sort
 * @return array of ratings or false
 */
function forum_get_ratings($postid, $sort="u.firstname ASC") {
    global $CFG;
    return get_records_sql("SELECT u.*, r.rating, r.time
                              FROM {$CFG->prefix}forum_ratings r,
                                   {$CFG->prefix}user u
                             WHERE r.post = '$postid'
                               AND r.userid = u.id
                             ORDER BY $sort");
}

/**
 * Returns a list of all new posts that have not been mailed yet
 * @param int $starttime - posts created after this time
 * @param int $endtime - posts created before this
 * @param int $now - used for timed discussions only
 */
function forum_get_unmailed_posts($starttime, $endtime, $now=null) {
    global $CFG;

    if (!empty($CFG->forum_enabletimedposts)) {
        if (empty($now)) {
            $now = time();
        }
        $timedsql = "AND (d.timestart < $now AND (d.timeend = 0 OR d.timeend > $now))";
    } else {
        $timedsql = "";
    }

    return get_records_sql("SELECT p.*, d.course, d.forum
                              FROM {$CFG->prefix}forum_posts p
                                   JOIN {$CFG->prefix}forum_discussions d ON d.id = p.discussion
                             WHERE p.mailed = 0
                                   AND p.created >= $starttime
                                   AND (p.created < $endtime OR p.mailnow = 1)
                                   $timedsql
                          ORDER BY p.modified ASC");
}

/**
 * Marks posts before a certain time as being mailed already
 */
function forum_mark_old_posts_as_mailed($endtime, $now=null) {
    global $CFG;
    if (empty($now)) {
        $now = time();
    }

    if (empty($CFG->forum_enabletimedposts)) {
        return execute_sql("UPDATE {$CFG->prefix}forum_posts
                               SET mailed = '1'
                             WHERE (created < $endtime OR mailnow = 1)
                                   AND mailed = 0", false);

    } else {
        return execute_sql("UPDATE {$CFG->prefix}forum_posts
                               SET mailed = '1'
                             WHERE discussion NOT IN (SELECT d.id
                                                        FROM {$CFG->prefix}forum_discussions d
                                                       WHERE d.timestart > $now)
                                   AND (created < $endtime OR mailnow = 1)
                                   AND mailed = 0", false);
    }
}

/**
 * Get all the posts for a user in a forum suitable for forum_print_post
 */
function forum_get_user_posts($forumid, $userid) {
    global $CFG;

    $timedsql = "";
    if (!empty($CFG->forum_enabletimedposts)) {
        $cm = get_coursemodule_from_instance('forum', $forumid);
        if (!has_capability('mod/forum:viewhiddentimedposts' , get_context_instance(CONTEXT_MODULE, $cm->id))) {
            $now = time();
            $timedsql = "AND (d.timestart < $now AND (d.timeend = 0 OR d.timeend > $now))";
        }
    }

    return get_records_sql("SELECT p.*, d.forum, u.firstname, u.lastname, u.email, u.picture, u.imagealt
                              FROM {$CFG->prefix}forum f
                                   JOIN {$CFG->prefix}forum_discussions d ON d.forum = f.id
                                   JOIN {$CFG->prefix}forum_posts p       ON p.discussion = d.id
                                   JOIN {$CFG->prefix}user u              ON u.id = p.userid
                             WHERE f.id = $forumid
                                   AND p.userid = $userid
                                   $timedsql
                          ORDER BY p.modified ASC");
}

/**
 * Get all the discussions user participated in
 * @param int $forumid
 * @param int $userid
 * @return array or false
 */
function forum_get_user_involved_discussions($forumid, $userid) {
    global $CFG;

    $timedsql = "";
    if (!empty($CFG->forum_enabletimedposts)) {
        $cm = get_coursemodule_from_instance('forum', $forumid);
        if (!has_capability('mod/forum:viewhiddentimedposts' , get_context_instance(CONTEXT_MODULE, $cm->id))) {
            $now = time();
            $timedsql = "AND (d.timestart < $now AND (d.timeend = 0 OR d.timeend > $now))";
        }
    }

    return get_records_sql("SELECT DISTINCT d.*
                              FROM {$CFG->prefix}forum f
                                   JOIN {$CFG->prefix}forum_discussions d ON d.forum = f.id
                                   JOIN {$CFG->prefix}forum_posts p       ON p.discussion = d.id
                             WHERE f.id = $forumid
                                   AND p.userid = $userid
                                   $timedsql");
}

/**
 * Get all the posts for a user in a forum suitable for forum_print_post
 * @param int $forumid
 * @param int $userid
 * @return array of counts or false
 */
function forum_count_user_posts($forumid, $userid) {
    global $CFG;

    $timedsql = "";
    if (!empty($CFG->forum_enabletimedposts)) {
        $cm = get_coursemodule_from_instance('forum', $forumid);
        if (!has_capability('mod/forum:viewhiddentimedposts' , get_context_instance(CONTEXT_MODULE, $cm->id))) {
            $now = time();
            $timedsql = "AND (d.timestart < $now AND (d.timeend = 0 OR d.timeend > $now))";
        }
    }

    return get_record_sql("SELECT COUNT(p.id) AS postcount, MAX(p.modified) AS lastpost
                             FROM {$CFG->prefix}forum f
                                  JOIN {$CFG->prefix}forum_discussions d ON d.forum = f.id
                                  JOIN {$CFG->prefix}forum_posts p       ON p.discussion = d.id
                                  JOIN {$CFG->prefix}user u              ON u.id = p.userid
                            WHERE f.id = $forumid
                                  AND p.userid = $userid
                                  $timedsql");
}

/**
 * Given a log entry, return the forum post details for it.
 */
function forum_get_post_from_log($log) {
    global $CFG;

    if ($log->action == "add post") {

        return get_record_sql("SELECT p.*, f.type AS forumtype, d.forum, d.groupid,
                                           u.firstname, u.lastname, u.email, u.picture
                                 FROM {$CFG->prefix}forum_discussions d,
                                      {$CFG->prefix}forum_posts p,
                                      {$CFG->prefix}forum f,
                                      {$CFG->prefix}user u
                                WHERE p.id = '$log->info'
                                  AND d.id = p.discussion
                                  AND p.userid = u.id
                                  AND u.deleted <> '1'
                                  AND f.id = d.forum");


    } else if ($log->action == "add discussion") {

        return get_record_sql("SELECT p.*, f.type AS forumtype, d.forum, d.groupid,
                                           u.firstname, u.lastname, u.email, u.picture
                                 FROM {$CFG->prefix}forum_discussions d,
                                      {$CFG->prefix}forum_posts p,
                                      {$CFG->prefix}forum f,
                                      {$CFG->prefix}user u
                                WHERE d.id = '$log->info'
                                  AND d.firstpost = p.id
                                  AND p.userid = u.id
                                  AND u.deleted <> '1'
                                  AND f.id = d.forum");
    }
    return NULL;
}

/**
 * Given a discussion id, return the first post from the discussion
 */
function forum_get_firstpost_from_discussion($discussionid) {
    global $CFG;

    return get_record_sql("SELECT p.*
                             FROM {$CFG->prefix}forum_discussions d,
                                  {$CFG->prefix}forum_posts p
                            WHERE d.id = '$discussionid'
                              AND d.firstpost = p.id ");
}

/**
 * Returns an array of counts of replies to each discussion
 */
function forum_count_discussion_replies($forumid, $forumsort="", $limit=-1, $page=-1, $perpage=0) {
    global $CFG;

    if ($limit > 0) {
        $limitfrom = 0;
        $limitnum  = $limit;
    } else if ($page != -1) {
        $limitfrom = $page*$perpage;
        $limitnum  = $perpage;
    } else {
        $limitfrom = 0;
        $limitnum  = 0;
    }

    if ($forumsort == "") {
        $orderby = "";
        $groupby = "";

    } else {
        $orderby = "ORDER BY $forumsort";
        $groupby = ", ".strtolower($forumsort);
        $groupby = str_replace('desc', '', $groupby);
        $groupby = str_replace('asc', '', $groupby);
    }

    if (($limitfrom == 0 and $limitnum == 0) or $forumsort == "") {
        $sql = "SELECT p.discussion, COUNT(p.id) AS replies, MAX(p.id) AS lastpostid
                  FROM {$CFG->prefix}forum_posts p
                       JOIN {$CFG->prefix}forum_discussions d ON p.discussion = d.id
                 WHERE p.parent > 0 AND d.forum = $forumid
              GROUP BY p.discussion";
        return get_records_sql($sql);

    } else {
        $sql = "SELECT p.discussion, (COUNT(p.id) - 1) AS replies, MAX(p.id) AS lastpostid
                  FROM {$CFG->prefix}forum_posts p
                       JOIN {$CFG->prefix}forum_discussions d ON p.discussion = d.id
                 WHERE d.forum = $forumid
              GROUP BY p.discussion $groupby
              $orderby";
        return get_records_sql("SELECT * FROM ($sql) sq", $limitfrom, $limitnum);
    }
}

function forum_count_discussions($forum, $cm, $course) {
    global $CFG, $USER;

    static $cache = array();

    $now = round(time(), -2); // db cache friendliness

    if (!isset($cache[$course->id])) {
        if (!empty($CFG->forum_enabletimedposts)) {
            $timedsql = "AND d.timestart < $now AND (d.timeend = 0 OR d.timeend > $now)";
        } else {
            $timedsql = "";
        }

        $sql = "SELECT f.id, COUNT(d.id) as dcount
                  FROM {$CFG->prefix}forum f
                       JOIN {$CFG->prefix}forum_discussions d ON d.forum = f.id
                 WHERE f.course = $course->id
                       $timedsql
              GROUP BY f.id";

        if ($counts = get_records_sql($sql)) {
            foreach ($counts as $count) {
                $counts[$count->id] = $count->dcount;
            }
            $cache[$course->id] = $counts;
        } else {
            $cache[$course->id] = array();
        }
    }

    if (empty($cache[$course->id][$forum->id])) {
        return 0;
    }

    $groupmode = groups_get_activity_groupmode($cm, $course);

    if ($groupmode != SEPARATEGROUPS) {
        return $cache[$course->id][$forum->id];
    }

    if (has_capability('moodle/site:accessallgroups', get_context_instance(CONTEXT_MODULE, $cm->id))) {
        return $cache[$course->id][$forum->id];
    }

    require_once($CFG->dirroot.'/course/lib.php');

    $modinfo =& get_fast_modinfo($course);
    if (is_null($modinfo->groups)) {
        $modinfo->groups = groups_get_user_groups($course->id, $USER->id);
    }

    if (empty($CFG->enablegroupings)) {
        $mygroups = $modinfo->groups[0];
    } else {
        $mygroups = $modinfo->groups[$cm->groupingid];
    }

    // add all groups posts
    if (empty($mygroups)) {
        $mygroups = array(-1=>-1);
    } else {
        $mygroups[-1] = -1;
    }
    $mygroups = implode(',', $mygroups);

    if (!empty($CFG->forum_enabletimedposts)) {
        $timedsql = "AND d.timestart < $now AND (d.timeend = 0 OR d.timeend > $now)";
    } else {
        $timedsql = "";
    }

    $sql = "SELECT COUNT(d.id)
              FROM {$CFG->prefix}forum_discussions d
             WHERE d.forum = $forum->id AND d.groupid IN ($mygroups)
                   $timedsql";

    return get_field_sql($sql);
}

/**
 * How many unrated posts are in the given discussion for a given user?
 */
function forum_count_unrated_posts($discussionid, $userid) {
    global $CFG;
    if ($posts = get_record_sql("SELECT count(*) as num
                                   FROM {$CFG->prefix}forum_posts
                                  WHERE parent > 0
                                    AND discussion = '$discussionid'
                                    AND userid <> '$userid' ")) {

        if ($rated = get_record_sql("SELECT count(*) as num
                                       FROM {$CFG->prefix}forum_posts p,
                                            {$CFG->prefix}forum_ratings r
                                      WHERE p.discussion = '$discussionid'
                                        AND p.id = r.post
                                        AND r.userid = '$userid'")) {
            $difference = $posts->num - $rated->num;
            if ($difference > 0) {
                return $difference;
            } else {
                return 0;    // Just in case there was a counting error
            }
        } else {
            return $posts->num;
        }
    } else {
        return 0;
    }
}

/**
 * Get all discussions in a forum
 */
function forum_get_discussions($cm, $forumsort="d.timemodified DESC", $fullpost=true, $unused=-1, $limit=-1, $userlastmodified=false, $page=-1, $perpage=0) {
    global $CFG, $USER;

    $timelimit = '';

    $modcontext = null;

    $now = round(time(), -2);

    $modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);

    if (!has_capability('mod/forum:viewdiscussion', $modcontext)) { /// User must have perms to view discussions
        return array();
    }

    if (!empty($CFG->forum_enabletimedposts)) { /// Users must fulfill timed posts

        if (!has_capability('mod/forum:viewhiddentimedposts', $modcontext)) {
            $timelimit = " AND ((d.timestart <= $now AND (d.timeend = 0 OR d.timeend > $now))";
            if (isloggedin()) {
                $timelimit .= " OR d.userid = $USER->id";
            }
            $timelimit .= ")";
        }
    }

    if ($limit > 0) {
        $limitfrom = 0;
        $limitnum  = $limit;
    } else if ($page != -1) {
        $limitfrom = $page*$perpage;
        $limitnum  = $perpage;
    } else {
        $limitfrom = 0;
        $limitnum  = 0;
    }

    $groupmode    = groups_get_activity_groupmode($cm);
    $currentgroup = groups_get_activity_group($cm);

    if ($groupmode) {
        if (empty($modcontext)) {
            $modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);
        }

        if ($groupmode == VISIBLEGROUPS or has_capability('moodle/site:accessallgroups', $modcontext)) {
            if ($currentgroup) {
                $groupselect = "AND (d.groupid = $currentgroup OR d.groupid = -1)";
            } else {
                $groupselect = "";
            }

        } else {
            //seprate groups without access all
            if ($currentgroup) {
                $groupselect = "AND (d.groupid = $currentgroup OR d.groupid = -1)";
            } else {
                $groupselect = "AND d.groupid = -1";
            }
        }
    } else {
        $groupselect = "";
    }


    if (empty($forumsort)) {
        $forumsort = "d.timemodified DESC";
    }
    if (empty($fullpost)) {
        $postdata = "p.id,p.subject,p.modified,p.discussion,p.userid";
    } else {
        $postdata = "p.*";
    }

    if (empty($userlastmodified)) {  // We don't need to know this
        $umfields = "";
        $umtable  = "";
    } else {
        $umfields = ", um.firstname AS umfirstname, um.lastname AS umlastname";
        $umtable  = " LEFT JOIN {$CFG->prefix}user um ON (d.usermodified = um.id)";
    }

    $sql = "SELECT $postdata, d.name, d.timemodified, d.usermodified, d.groupid, d.timestart, d.timeend,
                   u.firstname, u.lastname, u.email, u.picture, u.imagealt $umfields
              FROM {$CFG->prefix}forum_discussions d
                   JOIN {$CFG->prefix}forum_posts p ON p.discussion = d.id
                   JOIN {$CFG->prefix}user u ON p.userid = u.id
                   $umtable
             WHERE d.forum = {$cm->instance} AND p.parent = 0
                   $timelimit $groupselect
          ORDER BY $forumsort";
    return get_records_sql($sql, $limitfrom, $limitnum);
}

function forum_get_discussions_unread($cm) {
    global $CFG, $USER;

    $now = round(time(), -2);

    $groupmode    = groups_get_activity_groupmode($cm);
    $currentgroup = groups_get_activity_group($cm);

    if ($groupmode) {
        $modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);

        if ($groupmode == VISIBLEGROUPS or has_capability('moodle/site:accessallgroups', $modcontext)) {
            if ($currentgroup) {
                $groupselect = "AND (d.groupid = $currentgroup OR d.groupid = -1)";
            } else {
                $groupselect = "";
            }

        } else {
            //seprate groups without access all
            if ($currentgroup) {
                $groupselect = "AND (d.groupid = $currentgroup OR d.groupid = -1)";
            } else {
                $groupselect = "AND d.groupid = -1";
            }
        }
    } else {
        $groupselect = "";
    }

    $cutoffdate = $now - ($CFG->forum_oldpostdays*24*60*60);

    if (!empty($CFG->forum_enabletimedposts)) {
        $timedsql = "AND d.timestart < $now AND (d.timeend = 0 OR d.timeend > $now)";
    } else {
        $timedsql = "";
    }

    $sql = "SELECT d.id, COUNT(p.id) AS unread
              FROM {$CFG->prefix}forum_discussions d
                   JOIN {$CFG->prefix}forum_posts p     ON p.discussion = d.id
                   LEFT JOIN {$CFG->prefix}forum_read r ON (r.postid = p.id AND r.userid = $USER->id)
             WHERE d.forum = {$cm->instance}
                   AND p.modified >= $cutoffdate AND r.id is NULL
                   $timedsql
                   $groupselect
          GROUP BY d.id";
    if ($unreads = get_records_sql($sql)) {
        foreach ($unreads as $unread) {
            $unreads[$unread->id] = $unread->unread;
        }
        return $unreads;
    } else {
        return array();
    }
}

function forum_get_discussions_count($cm) {
    global $CFG, $USER;

    $now = round(time(), -2);

    $groupmode    = groups_get_activity_groupmode($cm);
    $currentgroup = groups_get_activity_group($cm);

    if ($groupmode) {
        $modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);

        if ($groupmode == VISIBLEGROUPS or has_capability('moodle/site:accessallgroups', $modcontext)) {
            if ($currentgroup) {
                $groupselect = "AND (d.groupid = $currentgroup OR d.groupid = -1)";
            } else {
                $groupselect = "";
            }

        } else {
            //seprate groups without access all
            if ($currentgroup) {
                $groupselect = "AND (d.groupid = $currentgroup OR d.groupid = -1)";
            } else {
                $groupselect = "AND d.groupid = -1";
            }
        }
    } else {
        $groupselect = "";
    }

    $cutoffdate = $now - ($CFG->forum_oldpostdays*24*60*60);

    $timelimit = "";

    if (!empty($CFG->forum_enabletimedposts)) {

        $modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);

        if (!has_capability('mod/forum:viewhiddentimedposts', $modcontext)) {
            $timelimit = " AND ((d.timestart <= $now AND (d.timeend = 0 OR d.timeend > $now))";
            if (isloggedin()) {
                $timelimit .= " OR d.userid = $USER->id";
            }
            $timelimit .= ")";
        }
    }

    $sql = "SELECT COUNT(d.id)
              FROM {$CFG->prefix}forum_discussions d
                   JOIN {$CFG->prefix}forum_posts p ON p.discussion = d.id
             WHERE d.forum = {$cm->instance} AND p.parent = 0
                   $timelimit $groupselect";

    return get_field_sql($sql);
}


/**
 * Get all discussions started by a particular user in a course (or group)
 * This function no longer used ...
 */
function forum_get_user_discussions($courseid, $userid, $groupid=0) {
    global $CFG;

    if ($groupid) {
        $groupselect = " AND d.groupid = '$groupid' ";
    } else  {
        $groupselect = "";
    }

    return get_records_sql("SELECT p.*, d.groupid, u.firstname, u.lastname, u.email, u.picture, u.imagealt,
                                   f.type as forumtype, f.name as forumname, f.id as forumid
                              FROM {$CFG->prefix}forum_discussions d,
                                   {$CFG->prefix}forum_posts p,
                                   {$CFG->prefix}user u,
                                   {$CFG->prefix}forum f
                             WHERE d.course = '$courseid'
                               AND p.discussion = d.id
                               AND p.parent = 0
                               AND p.userid = u.id
                               AND u.id = '$userid'
                               AND d.forum = f.id $groupselect
                          ORDER BY p.created DESC");
}

/**
 * Get the list of potential subscribers to a forum. 
 *
 * @param object $forumcontext the forum context.
 * @param integer $groupid the id of a group, or 0 for all groups.
 * @param string $fields the list of fields to return for each user. As for get_users_by_capability.
 * @param string $sort sort order. As for get_users_by_capability.
 * @return array list of users.
 */
function forum_get_potential_subscribers($forumcontext, $groupid, $fields, $sort) {
    return get_users_by_capability($forumcontext, 'mod/forum:initialsubscriptions', $fields, $sort, '', '', $groupid, '', false, true);
}

/**
 * Returns list of user objects that are subscribed to this forum
 *
 * @param object $course the course
 * @param forum $forum the forum
 * @param integer $groupid group id, or 0 for all.
 * @param object $context the forum context, to save re-fetching it where possible.
 * @return array list of users.
 */
function forum_subscribed_users($course, $forum, $groupid=0, $context = NULL) {
    global $CFG;

    if ($groupid) {
        $grouptables = ", {$CFG->prefix}groups_members gm ";
        $groupselect = "AND gm.groupid = $groupid AND u.id = gm.userid";

    } else  {
        $grouptables = '';
        $groupselect = '';
    }

    if (forum_is_forcesubscribed($forum)) {
        if (empty($context)) {
            $cm = get_coursemodule_from_instance('forum', $forum->id, $course->id);
            $context = get_context_instance(CONTEXT_MODULE, $cm->id);
        }
        $sort = "u.email ASC";
        $fields ="u.id, u.username, u.firstname, u.lastname, u.maildisplay, u.mailformat, u.maildigest, u.emailstop, u.imagealt,
                  u.email, u.city, u.country, u.lastaccess, u.lastlogin, u.picture, u.timezone, u.theme, u.lang, u.trackforums, u.mnethostid";
        $results = forum_get_potential_subscribers($context, $groupid, $fields, $sort);
    } else {
        $results = get_records_sql("SELECT u.id, u.username, u.firstname, u.lastname, u.maildisplay, u.mailformat, u.maildigest, u.emailstop, u.imagealt,
                                   u.email, u.city, u.country, u.lastaccess, u.lastlogin, u.picture, u.timezone, u.theme, u.lang, u.trackforums, u.mnethostid
                              FROM {$CFG->prefix}user u,
                                   {$CFG->prefix}forum_subscriptions s $grouptables
                             WHERE s.forum = '$forum->id'
                               AND s.userid = u.id
                               AND u.deleted = 0  $groupselect
                          ORDER BY u.email ASC");
    }

    static $guestid = null;

    if (is_null($guestid)) {
        if ($guest = guest_user()) {
            $guestid = $guest->id;
        } else {
            $guestid = 0;
        }
    }

    // Guest user should never be subscribed to a forum.
    unset($results[$guestid]);

    return $results;
}



// OTHER FUNCTIONS ///////////////////////////////////////////////////////////


function forum_get_course_forum($courseid, $type) {
// How to set up special 1-per-course forums
    global $CFG;

    if ($forums = get_records_select("forum", "course = '$courseid' AND type = '$type'", "id ASC")) {
        // There should always only be ONE, but with the right combination of
        // errors there might be more.  In this case, just return the oldest one (lowest ID).
        foreach ($forums as $forum) {
            return $forum;   // ie the first one
        }
    }

    // Doesn't exist, so create one now.
    $forum->course = $courseid;
    $forum->type = "$type";
    switch ($forum->type) {
        case "news":
            $forum->name  = addslashes(get_string("namenews", "forum"));
            $forum->intro = addslashes(get_string("intronews", "forum"));
            $forum->forcesubscribe = FORUM_FORCESUBSCRIBE;
            $forum->assessed = 0;
            if ($courseid == SITEID) {
                $forum->name  = get_string("sitenews");
                $forum->forcesubscribe = 0;
            }
            break;
        case "social":
            $forum->name  = addslashes(get_string("namesocial", "forum"));
            $forum->intro = addslashes(get_string("introsocial", "forum"));
            $forum->assessed = 0;
            $forum->forcesubscribe = 0;
            break;
        default:
            notify("That forum type doesn't exist!");
            return false;
            break;
    }

    $forum->timemodified = time();
    $forum->id = insert_record("forum", $forum);

    if (! $module = get_record("modules", "name", "forum")) {
        notify("Could not find forum module!!");
        return false;
    }
    $mod = new object();
    $mod->course = $courseid;
    $mod->module = $module->id;
    $mod->instance = $forum->id;
    $mod->section = 0;
    if (! $mod->coursemodule = add_course_module($mod) ) {   // assumes course/lib.php is loaded
        notify("Could not add a new course module to the course '" . format_string($course->fullname) . "'");
        return false;
    }
    if (! $sectionid = add_mod_to_section($mod) ) {   // assumes course/lib.php is loaded
        notify("Could not add the new course module to that section");
        return false;
    }
    if (! set_field("course_modules", "section", $sectionid, "id", $mod->coursemodule)) {
        notify("Could not update the course module with the correct section");
        return false;
    }
    include_once("$CFG->dirroot/course/lib.php");
    rebuild_course_cache($courseid);

    return get_record("forum", "id", "$forum->id");
}


/**
* Given the data about a posting, builds up the HTML to display it and
* returns the HTML in a string.  This is designed for sending via HTML email.
*/
function forum_make_mail_post($course, $forum, $discussion, $post, $userfrom, $userto,
                              $ownpost=false, $reply=false, $link=false, $rate=false, $footer="") {

    global $CFG;

    if (!isset($userto->viewfullnames[$forum->id])) {
        if (!$cm = get_coursemodule_from_instance('forum', $forum->id, $course->id)) {
            error('Course Module ID was incorrect');
        }
        $modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);
        $viewfullnames = has_capability('moodle/site:viewfullnames', $modcontext, $userto->id);
    } else {
        $viewfullnames = $userto->viewfullnames[$forum->id];
    }

    // format the post body
    $options = new object();
    $options->para = true;
    $formattedtext = format_text(trusttext_strip($post->message), $post->format, $options, $course->id);

    $output = '<table border="0" cellpadding="3" cellspacing="0" class="forumpost">';

    $output .= '<tr class="header"><td width="35" valign="top" class="picture left">';
    $output .= print_user_picture($userfrom, $course->id, $userfrom->picture, false, true);
    $output .= '</td>';

    if ($post->parent) {
        $output .= '<td class="topic">';
    } else {
        $output .= '<td class="topic starter">';
    }
    $output .= '<div class="subject">'.format_string($post->subject).'</div>';

    $fullname = fullname($userfrom, $viewfullnames);
    $by = new object();
    $by->name = '<a href="'.$CFG->wwwroot.'/user/view.php?id='.$userfrom->id.'&amp;course='.$course->id.'">'.$fullname.'</a>';
    $by->date = userdate($post->modified, '', $userto->timezone);
    $output .= '<div class="author">'.get_string('bynameondate', 'forum', $by).'</div>';

    $output .= '</td></tr>';

    $output .= '<tr><td class="left side" valign="top">';

    if (isset($userfrom->groups)) {
        $groups = $userfrom->groups[$forum->id];
    } else {
        if (!$cm = get_coursemodule_from_instance('forum', $forum->id, $course->id)) {
            error('Course Module ID was incorrect');
        }
// (Debug022): フォーラムのHTMLメール送信時に$groupsがUnknownとなるバグ (2009/07/06)
// (Debug022): ここから修正
//      $group = groups_get_all_groups($course->id, $userfrom->id, $cm->groupingid);
        $groups = groups_get_all_groups($course->id, $userfrom->id, $cm->groupingid);
// (Debug022): ここまで修正
    }

    if ($groups) {
        $output .= print_group_picture($groups, $course->id, false, true, true);
    } else {
        $output .= '&nbsp;';
    }

    $output .= '</td><td class="content">';

    if ($post->attachment) {
        $post->course = $course->id;
        $output .= '<div class="attachments">';
        $output .= forum_print_attachments($post, 'html');
        $output .= "</div>";
    }

    $output .= $formattedtext;

// Commands
    $commands = array();

    if ($post->parent) {
        $commands[] = '<a target="_blank" href="'.$CFG->wwwroot.'/mod/forum/discuss.php?d='.
                      $post->discussion.'&amp;parent='.$post->parent.'">'.get_string('parent', 'forum').'</a>';
    }

    if ($reply) {
        $commands[] = '<a target="_blank" href="'.$CFG->wwwroot.'/mod/forum/post.php?reply='.$post->id.'">'.
                      get_string('reply', 'forum').'</a>';
    }

    $output .= '<div class="commands">';
    $output .= implode(' | ', $commands);
    $output .= '</div>';

// Context link to post if required
    if ($link) {
        $output .= '<div class="link">';
        $output .= '<a target="_blank" href="'.$CFG->wwwroot.'/mod/forum/discuss.php?d='.$post->discussion.'#p'.$post->id.'">'.
                     get_string('postincontext', 'forum').'</a>';
        $output .= '</div>';
    }

    if ($footer) {
        $output .= '<div class="footer">'.$footer.'</div>';
    }
    $output .= '</td></tr></table>'."\n\n";

    return $output;
}

/**
 * Print a forum post
 *
 * @param object $post The post to print.
 * @param integer $courseid The course this post belongs to.
 * @param boolean $ownpost Whether this post belongs to the current user.
 * @param boolean $reply Whether to print a 'reply' link at the bottom of the message.
 * @param boolean $link Just print a shortened version of the post as a link to the full post.
 * @param object $ratings -- I don't really know --
 * @param string $footer Extra stuff to print after the message.
 * @param string $highlight Space-separated list of terms to highlight.
 * @param int $post_read true, false or -99. If we already know whether this user
 *          has read this post, pass that in, otherwise, pass in -99, and this
 *          function will work it out.
 * @param boolean $dummyifcantsee When forum_user_can_see_post says that
 *          the current user can't see this post, if this argument is true
 *          (the default) then print a dummy 'you can't see this post' post.
 *          If false, don't output anything at all.
 */
function forum_print_post($post, $discussion, $forum, &$cm, $course, $ownpost=false, $reply=false, $link=false,
                          $ratings=NULL, $footer="", $highlight="", $post_read=null, $dummyifcantsee=true, $istracked=null) {

    global $USER, $CFG;
// (Shirai088): フォーラムのスレッドをZIPファイルで出力するフォーラムダンプ機能の追加 (2008/08/29)
// (Shirai088): ここから追加
    global $forumdump;
// (Shirai088): ここまで追加

    static $stredit, $strdelete, $strreply, $strparent, $strprune;
    static $strpruneheading, $displaymode;
    static $strmarkread, $strmarkunread;

    $post->course = $course->id;
    $post->forum  = $forum->id;

    // caching
    if (!isset($cm->cache)) {
        $cm->cache = new object();
    }

    if (!isset($cm->cache->caps)) {
        $cm->cache->caps = array();
        $modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);
        $cm->cache->caps['mod/forum:viewdiscussion']   = has_capability('mod/forum:viewdiscussion', $modcontext);
        $cm->cache->caps['moodle/site:viewfullnames']  = has_capability('moodle/site:viewfullnames', $modcontext);
        $cm->cache->caps['mod/forum:editanypost']      = has_capability('mod/forum:editanypost', $modcontext);
        $cm->cache->caps['mod/forum:splitdiscussions'] = has_capability('mod/forum:splitdiscussions', $modcontext);
        $cm->cache->caps['mod/forum:deleteownpost']    = has_capability('mod/forum:deleteownpost', $modcontext);
        $cm->cache->caps['mod/forum:deleteanypost']    = has_capability('mod/forum:deleteanypost', $modcontext);
        $cm->cache->caps['mod/forum:viewanyrating']    = has_capability('mod/forum:viewanyrating', $modcontext);
    }

    if (!isset($cm->uservisible)) {
        $cm->uservisible = coursemodule_visible_for_user($cm);
    }

    if (!forum_user_can_see_post($forum, $discussion, $post, NULL, $cm)) {
        if (!$dummyifcantsee) {
            return;
        }
        echo '<a id="p'.$post->id.'"></a>';
        echo '<table cellspacing="0" class="forumpost">';
        echo '<tr class="header"><td class="picture left">';
        //        print_user_picture($post->userid, $courseid, $post->picture);
        echo '</td>';
        if ($post->parent) {
            echo '<td class="topic">';
        } else {
            echo '<td class="topic starter">';
        }
        echo '<div class="subject">'.get_string('forumsubjecthidden','forum').'</div>';
        echo '<div class="author">';
        print_string('forumauthorhidden','forum');
        echo '</div></td></tr>';

        echo '<tr><td class="left side">';
        echo '&nbsp;';

        // Actual content

        echo '</td><td class="content">'."\n";
        echo get_string('forumbodyhidden','forum');
        echo '</td></tr></table>';
        return;
    }

    if (empty($stredit)) {
        $stredit         = get_string('edit', 'forum');
        $strdelete       = get_string('delete', 'forum');
        $strreply        = get_string('reply', 'forum');
        $strparent       = get_string('parent', 'forum');
        $strpruneheading = get_string('pruneheading', 'forum');
        $strprune        = get_string('prune', 'forum');
        $displaymode     = get_user_preferences('forum_displaymode', $CFG->forum_displaymode);
        $strmarkread     = get_string('markread', 'forum');
        $strmarkunread   = get_string('markunread', 'forum');

    }

    $read_style = '';
    // ignore trackign status if not tracked or tracked param missing
    if ($istracked) {
        if (is_null($post_read)) {
            debugging('fetching post_read info');
            $post_read = forum_tp_is_post_read($USER->id, $post);
        }

        if ($post_read) {
            $read_style = ' read';
        } else {
            $read_style = ' unread';
            echo '<a name="unread"></a>';
        }
    }

    echo '<a id="p'.$post->id.'"></a>';
    echo '<table cellspacing="0" class="forumpost'.$read_style.'">';

    // Picture
    $postuser = new object();
    $postuser->id        = $post->userid;
    $postuser->firstname = $post->firstname;
    $postuser->lastname  = $post->lastname;
    $postuser->imagealt  = $post->imagealt;
    $postuser->picture   = $post->picture;
// (Shirai084): 写真をクリックすると，このフォーラムで，このユーザが投稿した投稿の検索結果を表示する機能の追加 (2008/08/19)
// (Shirai084): ここから追加
    if (fs_function_enable('FS_DISABLE_FORUMSEARCHBYPICTURE')) $postuser->byPicture = $forum->id;
// (Shirai084): ここまで追加

    echo '<tr class="header"><td class="picture left">';
// (Shirai088): フォーラムのスレッドをZIPファイルで出力するフォーラムダンプ機能の追加 (2008/08/29)
// (Shirai088): ここから追加
    if (!$forumdump) {
// (Shirai088): ここまで追加
    print_user_picture($postuser, $course->id);
// (Shirai088): ここから追加
    } else {
        global $fsCFG;
        $file   = 'f2';
        $size   = 35;
        $class  = "userpicture";
        $imagealt = get_string('pictureof','',fullname($postuser));
        if (!empty($HTTPSPAGEREQUIRED)) $wwwroot = $CFG->httpswwwroot;
            else                        $wwwroot = $CFG->wwwroot;
        $url = '/user/view.php?id='. $post->userid .'&amp;course='. $course->id ;
        $target="target = '_blank'";
        $output = '<a '.$target.' href="'. $wwwroot . $url .'">';
        if ($post->picture) {  // Print custom user picture
            $image  = $file.'.jpg';
            $src    = make_user_directory($post->userid, true) . "/$image";
        } else {         // Print default user pictures (use theme version if available)
            $class .= " defaultuserpic";
            $image  = $file.'.png';
            $src    =  "$CFG->dirroot/pix/u/$file.png";
        }
        $lsrc   = "pix/$post->userid/$image";
        if (file_exists($src) and !is_dir($src)) {
            $output .= "<img class=\"$class\" src=\"$lsrc\" height=\"$size\" width=\"$size\" alt=\"".s($imagealt).'"  />';
            $dest = "$fsCFG->fdump_pixpath/$post->userid";
            if (!fs_file_exists($dest)) fs_mkdir($dest);
            fs_copy($src, "$dest/$image");
        }
        echo $output;
    }
// (Shirai088): ここまで追加
    echo '</td>';

    if ($post->parent) {
        echo '<td class="topic">';
    } else {
        echo '<td class="topic starter">';
    }

    if (!empty($post->subjectnoformat)) {
        echo '<div class="subject">'.$post->subject.'</div>';
    } else {
        echo '<div class="subject">'.format_string($post->subject).'</div>';
    }

    echo '<div class="author">';
    $fullname = fullname($postuser, $cm->cache->caps['moodle/site:viewfullnames']);
    $by = new object();
// (Shirai088): フォーラムのスレッドをZIPファイルで出力するフォーラムダンプ機能の追加 (2008/08/29)
// (Shirai088): ここから追加
    if (!$forumdump) {
// (Shirai088): ここまで追加
    $by->name = '<a href="'.$CFG->wwwroot.'/user/view.php?id='.
                $post->userid.'&amp;course='.$course->id.'">'.$fullname.'</a>';
// (Shirai088): ここから追加
    } else $by->name = $fullname;
// (Shirai088): ここまで追加
    $by->date = userdate($post->modified);
    print_string('bynameondate', 'forum', $by);
// (Shirai002): フォーラムの書き込みに一つずつ固有のナンバを表示する（吉田さん）
// (Shirai118): フォーラム投稿のサーチ機能を強化するいくつかの機能拡張 (2009/02/12)
// (Shirai118): ここから追加
    if (fs_function_enable('FS_DISABLE_FORUM_EXSEARCH') && !is_mobile_on()) {
        $prestr  = '<a href="'.public_wwwroot().'/mod/forum/discuss.php?d='.$post->discussion.'#p'.$post->id.'">';
        $poststr = '</a>';
    } else $prestr = $poststr = '';
    echo '&nbsp;(ID:'.$prestr.$post->id.$poststr.')';
// (Shirai118): ここまで追加
    echo '</div></td></tr>';

    echo '<tr><td class="left side">';
    if (isset($cm->cache->usersgroups)) {
        $groups = array();
        if (isset($cm->cache->usersgroups[$post->userid])) {
            foreach ($cm->cache->usersgroups[$post->userid] as $gid) {
                $groups[$gid] = $cm->cache->groups[$gid];
            }
        }
    } else {
        $groups = groups_get_all_groups($course->id, $post->userid, $cm->groupingid);
    }

    if ($groups) {
        print_group_picture($groups, $course->id, false, false, true);
    } else {
        echo '&nbsp;';
    }

// Actual content

    echo '</td><td class="content">'."\n";

    if ($post->attachment) {
        echo '<div class="attachments">';
        $attachedimages = forum_print_attachments($post);
        echo '</div>';
    } else {
        $attachedimages = '';
    }


    $options = new object();
    $options->para      = false;
    $options->trusttext = true;
    if ($link and (strlen(strip_tags($post->message)) > $CFG->forum_longpost)) {
        // Print shortened version
        echo format_text(forum_shorten_post($post->message), $post->format, $options, $course->id);
        $numwords = count_words(strip_tags($post->message));
        echo '<div class="posting"><a href="'.$CFG->wwwroot.'/mod/forum/discuss.php?d='.$post->discussion.'">';
        echo get_string('readtherest', 'forum');
        echo '</a> ('.get_string('numwords', '', $numwords).')...</div>';
    } else {
        // Print whole message
        echo '<div class="posting">';
        if ($highlight) {
            echo highlight($highlight, format_text($post->message, $post->format, $options, $course->id));
        } else {
            echo format_text($post->message, $post->format, $options, $course->id);
        }
        echo '</div>';
        echo $attachedimages;
    }


// Commands

    $commands = array();

// (Shirai157): ”このコンテンツを電子メール送信するボタン”機能の追加 (2009/07/04)
// (Shirai157): ここから追加
    if (fs_function_enable('FS_DISABLE_SENDTHISCONTENTS2ME') and is_send2me_on() and isloggedin() and !isguest()) {
        $commands[] = '<a href="'.$CFG->wwwroot.'/lib/fs_moodle/send2me.php?type=forum&amp;d='.
              $post->discussion.'&amp;postid='.$post->id.'" target="_blank">'.get_string('send2meButton','fs_moodle').'</a>';
    }
// (Shirai157): ここまで追加
    if ($istracked) {
        // SPECIAL CASE: The front page can display a news item post to non-logged in users.
        // Don't display the mark read / unread controls in this case.
        if ($CFG->forum_usermarksread and isloggedin()) {
            if ($post_read) {
                $mcmd = '&amp;mark=unread&amp;postid='.$post->id;
                $mtxt = $strmarkunread;
            } else {
                $mcmd = '&amp;mark=read&amp;postid='.$post->id;
                $mtxt = $strmarkread;
            }
            if ($displaymode == FORUM_MODE_THREADED) {
                $commands[] = '<a href="'.$CFG->wwwroot.'/mod/forum/discuss.php?d='.
                              $post->discussion.'&amp;parent='.$post->id.$mcmd.'">'.$mtxt.'</a>';
            } else {
                $commands[] = '<a href="'.$CFG->wwwroot.'/mod/forum/discuss.php?d='.
                              $post->discussion.$mcmd.'#p'.$post->id.'">'.$mtxt.'</a>';
            }
        }
    }

    if ($post->parent) {  // Zoom in to the parent specifically
        if ($displaymode == FORUM_MODE_THREADED) {
            $commands[] = '<a href="'.$CFG->wwwroot.'/mod/forum/discuss.php?d='.
                      $post->discussion.'&amp;parent='.$post->parent.'">'.$strparent.'</a>';
        } else {
            $commands[] = '<a href="'.$CFG->wwwroot.'/mod/forum/discuss.php?d='.
                      $post->discussion.'#p'.$post->parent.'">'.$strparent.'</a>';
        }
    }

    $age = time() - $post->created;
    // Hack for allow to edit news posts those are not displayed yet until they are displayed
    if (!$post->parent and $forum->type == 'news' and $discussion->timestart > time()) {
        $age = 0;
    }
    $editanypost = $cm->cache->caps['mod/forum:editanypost'];

    if ($ownpost or $editanypost) {
        if (($age < $CFG->maxeditingtime) or $editanypost) {
            $commands[] =  '<a href="'.$CFG->wwwroot.'/mod/forum/post.php?edit='.$post->id.'">'.$stredit.'</a>';
        }
    }

    if ($cm->cache->caps['mod/forum:splitdiscussions']
                && $post->parent && $forum->type != 'single') {

        $commands[] = '<a href="'.$CFG->wwwroot.'/mod/forum/post.php?prune='.$post->id.
                      '" title="'.$strpruneheading.'">'.$strprune.'</a>';
    }

    if (($ownpost and $age < $CFG->maxeditingtime
                and $cm->cache->caps['mod/forum:deleteownpost'])
                or $cm->cache->caps['mod/forum:deleteanypost']) {
        $commands[] = '<a href="'.$CFG->wwwroot.'/mod/forum/post.php?delete='.$post->id.'">'.$strdelete.'</a>';
    }

    if ($reply) {
        $commands[] = '<a href="'.$CFG->wwwroot.'/mod/forum/post.php?reply='.$post->id.'">'.$strreply.'</a>';
    }

// (Shirai088): フォーラムのスレッドをZIPファイルで出力するフォーラムダンプ機能の追加 (2008/08/29)
// (Shirai088): ここから追加
    if (!$forumdump) {
// (Shirai088): ここまで追加
    echo '<div class="commands">';
    echo implode(' | ', $commands);
    echo '</div>';
// (Shirai088): ここから追加
    }
// (Shirai088): ここまで追加


// Ratings

// (Shirai088): フォーラムのスレッドをZIPファイルで出力するフォーラムダンプ機能の追加 (2008/08/29)
// (Shirai088): ここから追加
    if (!$forumdump) {
// (Shirai088): ここまで追加
    $ratingsmenuused = false;
    if (!empty($ratings) and isloggedin()) {
        echo '<div class="ratings">';
        $useratings = true;
        if ($ratings->assesstimestart and $ratings->assesstimefinish) {
            if ($post->created < $ratings->assesstimestart or $post->created > $ratings->assesstimefinish) {
                $useratings = false;
            }
        }
        if ($useratings) {
            $mypost = ($USER->id == $post->userid);

            $canviewallratings = $cm->cache->caps['mod/forum:viewanyrating'];

            if (isset($cm->cache->ratings)) {
                if (isset($cm->cache->ratings[$post->id])) {
                    $allratings = $cm->cache->ratings[$post->id];
                } else {
                    $allratings = array(); // no reatings present yet
                }
            } else {
                $allratings = NULL; // not preloaded
            }

            if (isset($cm->cache->myratings)) {
                if (isset($cm->cache->myratings[$post->id])) {
                    $myrating = $cm->cache->myratings[$post->id];
                } else {
                    $myrating = FORUM_UNSET_POST_RATING; // no reatings present yet
                }
            } else {
                $myrating = NULL; // not preloaded
            }

            if ($canviewallratings and !$mypost) {
                echo '<span class="forumpostratingtext">' .
                     forum_print_ratings($post->id, $ratings->scale, $forum->assessed, $canviewallratings, $allratings, true) .
                     '</span>';
                if (!empty($ratings->allow)) {
                    echo '&nbsp;';
                    forum_print_rating_menu($post->id, $USER->id, $ratings->scale, $myrating);
                    $ratingsmenuused = true;
                }

            } else if ($mypost) {
                echo '<span class="forumpostratingtext">' .
                     forum_print_ratings($post->id, $ratings->scale, $forum->assessed, true, $allratings, true) .
                     '</span>';

            } else if (!empty($ratings->allow) ) {
                forum_print_rating_menu($post->id, $USER->id, $ratings->scale, $myrating);
                $ratingsmenuused = true;
            }
        }
        echo '</div>';
    }
// (Shirai088): ここから追加
    } else {
        $ratingsmenuused = false;
    }
// (Shirai088): ここまで追加

// Link to post if required

    if ($link) {
        echo '<div class="link">';
        if ($post->replies == 1) {
            $replystring = get_string('repliesone', 'forum', $post->replies);
        } else {
            $replystring = get_string('repliesmany', 'forum', $post->replies);
        }
        echo '<a href="'.$CFG->wwwroot.'/mod/forum/discuss.php?d='.$post->discussion.'">'.
             get_string('discussthistopic', 'forum').'</a>&nbsp;('.$replystring.')';
        echo '</div>';
    }

    if ($footer) {
        echo '<div class="footer">'.$footer.'</div>';
    }
    echo '</td></tr></table>'."\n\n";

    if ($istracked && !$CFG->forum_usermarksread && !$post_read) {
        forum_tp_mark_post_read($USER->id, $post, $forum->id);
    }

    return $ratingsmenuused;
}


/**
 * This function prints the overview of a discussion in the forum listing.
 * It needs some discussion information and some post information, these
 * happen to be combined for efficiency in the $post parameter by the function
 * that calls this one: forum_print_latest_discussions()
 *
 * @param object $post The post object (passed by reference for speed).
 * @param object $forum The forum object.
 * @param int $group Current group.
 * @param string $datestring Format to use for the dates.
 * @param boolean $cantrack Is tracking enabled for this forum.
 * @param boolean $forumtracked Is the user tracking this forum.
 * @param boolean $canviewparticipants True if user has the viewparticipants permission for this course
 */
function forum_print_discussion_header(&$post, $forum, $group=-1, $datestring="",
                                        $cantrack=true, $forumtracked=true, $canviewparticipants=true, $modcontext=NULL) {

    global $USER, $CFG;

    static $rowcount;
    static $strmarkalldread;

    if (empty($modcontext)) {
        if (!$cm = get_coursemodule_from_instance('forum', $forum->id, $forum->course)) {
            error('Course Module ID was incorrect');
        }
        $modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);
    }

    if (!isset($rowcount)) {
        $rowcount = 0;
        $strmarkalldread = get_string('markalldread', 'forum');
    } else {
        $rowcount = ($rowcount + 1) % 2;
    }

    $post->subject = format_string($post->subject,true);

    echo "\n\n";
    echo '<tr class="discussion r'.$rowcount.'">';

    // Topic
    echo '<td class="topic starter">';
    echo '<a href="'.$CFG->wwwroot.'/mod/forum/discuss.php?d='.$post->discussion.'">'.$post->subject.'</a>';
    echo "</td>\n";

    // Picture
    $postuser = new object;
    $postuser->id = $post->userid;
    $postuser->firstname = $post->firstname;
    $postuser->lastname = $post->lastname;
    $postuser->imagealt = $post->imagealt;
    $postuser->picture = $post->picture;
// (Shirai084): 写真をクリックすると，このフォーラムで，このユーザが投稿した投稿の検索結果を表示する機能の追加 (2008/08/19)
// (Shirai084): ここから追加
    if (fs_function_enable('FS_DISABLE_FORUMSEARCHBYPICTURE')) $postuser->byPicture = $forum->id;
// (Shirai084): ここまで追加

// (Shirai180): モバイルモード時にフォーラム投稿のリスト表示画面を簡素化する改良 (2010/02/09)
// (Shirai180): ここから追加
    if (!is_mobile_on()) {
// (Shirai180): ここまで追加
    echo '<td class="picture">';
    print_user_picture($postuser, $forum->course);
    echo "</td>\n";
// (Shirai180): ここから追加
    }
// (Shirai180): ここまで追加

    // User name
    $fullname = fullname($post, has_capability('moodle/site:viewfullnames', $modcontext));
    echo '<td class="author">';
    echo '<a href="'.$CFG->wwwroot.'/user/view.php?id='.$post->userid.'&amp;course='.$forum->course.'">'.$fullname.'</a>';
    echo "</td>\n";

    // Group picture
    if ($group !== -1) {  // Groups are active - group is a group data object or NULL
        echo '<td class="picture group">';
        if (!empty($group->picture) and empty($group->hidepicture)) {
            print_group_picture($group, $forum->course, false, false, true);
        } else if (isset($group->id)) {
            if($canviewparticipants) {
                echo '<a href="'.$CFG->wwwroot.'/user/index.php?id='.$forum->course.'&amp;group='.$group->id.'">'.$group->name.'</a>';
            } else {
                echo $group->name;
            }
        }
        echo "</td>\n";
    }

    if (has_capability('mod/forum:viewdiscussion', $modcontext)) {   // Show the column with replies
        echo '<td class="replies">';
        echo '<a href="'.$CFG->wwwroot.'/mod/forum/discuss.php?d='.$post->discussion.'">';
        echo $post->replies.'</a>';
        echo "</td>\n";

        if ($cantrack) {
            echo '<td class="replies">';
            if ($forumtracked) {
                if ($post->unread > 0) {
                    echo '<span class="unread">';
                    echo '<a href="'.$CFG->wwwroot.'/mod/forum/discuss.php?d='.$post->discussion.'#unread">';
                    echo $post->unread;
                    echo '</a>';
                    echo '<a title="'.$strmarkalldread.'" href="'.$CFG->wwwroot.'/mod/forum/markposts.php?f='.
                         $forum->id.'&amp;d='.$post->discussion.'&amp;mark=read&amp;returnpage=view.php">' .
                         '<img src="'.$CFG->pixpath.'/t/clear.gif" class="iconsmall" alt="'.$strmarkalldread.'" /></a>';
                    echo '</span>';
                } else {
                    echo '<span class="read">';
                    echo $post->unread;
                    echo '</span>';
                }
            } else {
                echo '<span class="read">';
                echo '-';
                echo '</span>';
            }
            echo "</td>\n";
        }
    }

    echo '<td class="lastpost">';
    $usedate = (empty($post->timemodified)) ? $post->modified : $post->timemodified;  // Just in case
    $parenturl = (empty($post->lastpostid)) ? '' : '&amp;parent='.$post->lastpostid;
    $usermodified = new object();
    $usermodified->id        = $post->usermodified;
    $usermodified->firstname = $post->umfirstname;
    $usermodified->lastname  = $post->umlastname;
    echo '<a href="'.$CFG->wwwroot.'/user/view.php?id='.$post->usermodified.'&amp;course='.$forum->course.'">'.
         fullname($usermodified).'</a><br />';
// (Shirai180): モバイルモード時にフォーラム投稿のリスト表示画面を簡素化する改良 (2010/02/09)
// (Shirai180): ここからコメントアウト
//  echo '<a href="'.$CFG->wwwroot.'/mod/forum/discuss.php?d='.$post->discussion.$parenturl.'">'.
//        userdate($usedate, $datestring).'</a>';
// (Shirai180): ここから追加
    if (is_mobile_on()) $datestring = "'".'%y/%m/%d %H:%M';
    echo '<a href="'.$CFG->wwwroot.'/mod/forum/discuss.php?d='.$post->discussion.$parenturl.'">';
    if (is_mobile_on()) echo userdate($usedate, $datestring, 99, false);
      else              echo userdate($usedate, $datestring);
    echo '</a>';
// (Shirai180): ここまで追加
    echo "</td>\n";

    echo "</tr>\n\n";

}


/**
 * Given a post object that we already know has a long message
 * this function truncates the message nicely to the first
 * sane place between $CFG->forum_longpost and $CFG->forum_shortpost
 */
function forum_shorten_post($message) {

   global $CFG;

   $i = 0;
   $tag = false;
// (Shirai173): フロントページに表示するニュースフォーラムの省略表示が日本語の場合は全文表示されてしまう問題 (2009/10/30)
// (Shirai173): ここから修正
// $length = strlen($message);
   $length = mb_strlen($message);
// (Shirai173): ここまで修正
   $count = 0;
   $stopzone = false;
   $truncate = 0;

   for ($i=0; $i<$length; $i++) {
// (Shirai173): ここから修正
//     $char = $message[$i];
       $char = mb_substr($message, $i, 1);
// (Shirai173): ここまで修正

       switch ($char) {
           case "<":
               $tag = true;
               break;
           case ">":
               $tag = false;
               break;
           default:
               if (!$tag) {
                   if ($stopzone) {
// (Shirai173): ここから修正
//                     if ($char == ".") {
                       if (($char == ".") or ($char == '．') or ($char == '。')) {
// (Shirai173): ここまで修正
                           $truncate = $i+1;
                           break 2;
                       }
                   }
                   $count++;
               }
               break;
       }
       if (!$stopzone) {
           if ($count > $CFG->forum_shortpost) {
               $stopzone = true;
           }
       }
   }

   if (!$truncate) {
       $truncate = $i;
   }

// (Shirai173): ここから修正
// return substr($message, 0, $truncate);
   return mb_substr($message, 0, $truncate);
// (Shirai173): ここまで修正
}


/**
 * Print the multiple ratings on a post given to the current user by others.
 * Forumid prevents the double lookup of the forumid in discussion to determine the aggregate type
 * Scale is an array of ratings
 */
function forum_print_ratings($postid, $scale, $aggregatetype, $link=true, $ratings=null, $return=false) {

    $strratings = '';

    switch ($aggregatetype) {
        case FORUM_AGGREGATE_AVG :
            $agg        = forum_get_ratings_mean($postid, $scale, $ratings);
            $strratings = get_string("aggregateavg", "forum");
            break;
        case FORUM_AGGREGATE_COUNT :
            $agg        = forum_get_ratings_count($postid, $scale, $ratings);
            $strratings = get_string("aggregatecount", "forum");
            break;
        case FORUM_AGGREGATE_MAX :
            $agg        = forum_get_ratings_max($postid, $scale, $ratings);
            $strratings = get_string("aggregatemax", "forum");
            break;
        case FORUM_AGGREGATE_MIN :
            $agg        = forum_get_ratings_min($postid, $scale, $ratings);
            $strratings = get_string("aggregatemin", "forum");
            break;
        case FORUM_AGGREGATE_SUM :
            $agg        = forum_get_ratings_sum($postid, $scale, $ratings);
            $strratings = get_string("aggregatesum", "forum");
            break;
    }

    if ($agg !== "") {

        if (empty($strratings)) {
            $strratings = get_string("ratings", "forum");
        }

        $strratings .= ': ';

        if ($link) {
            $strratings .= link_to_popup_window ("/mod/forum/report.php?id=$postid", "ratings", $agg, 400, 600, null, null, true);
        } else {
            $strratings .= "$agg ";
        }

        if ($return) {
            return $strratings;
        } else {
            echo $strratings;
        }
    }
}


/**
 * Return the mean rating of a post given to the current user by others.
 * Scale is an array of possible ratings in the scale
 * Ratings is an optional simple array of actual ratings (just integers)
 * Forumid is the forum id field needed - passing it avoids a double query of lookup up the discusion and then the forum id to get the aggregate type
 */
function forum_get_ratings_mean($postid, $scale, $ratings=NULL) {

    if (is_null($ratings)) {
        $ratings = array();
        if ($rates = get_records("forum_ratings", "post", $postid)) {
            foreach ($rates as $rate) {
                $ratings[] = $rate->rating;
            }
        }
    }

    $count = count($ratings);

    if ($count == 0 ) {
        return "";

    } else if ($count == 1) {
        $rating = reset($ratings);
        return $scale[$rating];

    } else {
        $total = 0;
        foreach ($ratings as $rating) {
            $total += $rating;
        }
        $mean = round( ((float)$total/(float)$count) + 0.001);  // Little fudge factor so that 0.5 goes UP

        if (isset($scale[$mean])) {
            return $scale[$mean]." ($count)";
        } else {
            return "$mean ($count)";    // Should never happen, hopefully
        }
    }
}

/**
 * Return the count of the ratings of a post given to the current user by others.
 *
 * For numerical grades, the scale index is the same as the real grade value from interval {0..n}
 * and $scale looks like Array( 0 => '0/n', 1 => '1/n', ..., n => 'n/n' )
 *
 * For scales, the index is the order of the scale item {1..n}
 * and $scale looks like Array( 1 => 'poor', 2 => 'weak', 3 => 'good' )
 * In case of no ratings done yet, we have nothing to display.
 *
 * @param int $postid
 * @param array $scale Possible ratings in the scale - the end of the scale is the highest or max grade
 * @param array $ratings An optional simple array of actual ratings (just integers)
 */
function forum_get_ratings_count($postid, $scale, $ratings=NULL) {

    if (is_null($ratings)) {
        $ratings = array();
        if ($rates = get_records("forum_ratings", "post", $postid)) {
            foreach ($rates as $rate) {
                $ratings[] = $rate->rating;
            }
        }
    }

    $count = count($ratings);
    if (! array_key_exists(0, $scale)) {
        $scaleused = true;
    } else {
        $scaleused = false;
    }

    if ($count == 0) {
        if ($scaleused) {    // If no rating given yet and we use a scale
            return get_string('noratinggiven', 'forum');
        } else {
            return '';
        }
    }

    $maxgradeidx = max(array_keys($scale)); // For numerical grades, the index is the same as the real grade value {0..n}
                                            // and $scale looks like Array( 0 => '0/n', 1 => '1/n', ..., n => 'n/n' )
                                            // For scales, the index is the order of the scale item {1..n}
                                            // and $scale looks like Array( 1 => 'poor', 2 => 'weak', 3 => 'good' )

    if ($count > $maxgradeidx) {      // The count exceeds the max grade
        $a = new stdClass();
        $a->count = $count;
        $a->grade = $scale[$maxgradeidx];
        return get_string('aggregatecountformat', 'forum', $a);
    } else {                                // Display the count and the aggregated grade for this post
        $a = new stdClass();
        $a->count = $count;
        $a->grade = $scale[$count];
        return get_string('aggregatecountformat', 'forum', $a);
    }
}

/**
 * Return the max rating of a post given to the current user by others.
 * Scale is an array of possible ratings in the scale
 * Ratings is an optional simple array of actual ratings (just integers)
 */
function forum_get_ratings_max($postid, $scale, $ratings=NULL) {

    if (is_null($ratings)) {
        $ratings = array();
        if ($rates = get_records("forum_ratings", "post", $postid)) {
            foreach ($rates as $rate) {
                $ratings[] = $rate->rating;
            }
        }
    }

    $count = count($ratings);

    if ($count == 0 ) {
        return "";

    } else if ($count == 1) { //this works for max
        $rating = reset($ratings);
        return $scale[$rating];

    } else {
        $max = max($ratings);

        if (isset($scale[$max])) {
            return $scale[$max]." ($count)";
        } else {
            return "$max ($count)";    // Should never happen, hopefully
        }
    }
}

/**
 * Return the min rating of a post given to the current user by others.
 * Scale is an array of possible ratings in the scale
 * Ratings is an optional simple array of actual ratings (just integers)
 */
function forum_get_ratings_min($postid, $scale,  $ratings=NULL) {

    if (is_null($ratings)) {
        $ratings = array();
        if ($rates = get_records("forum_ratings", "post", $postid)) {
            foreach ($rates as $rate) {
                $ratings[] = $rate->rating;
            }
        }
    }

    $count = count($ratings);

    if ($count == 0 ) {
        return "";

    } else if ($count == 1) {
        $rating = reset($ratings);
        return $scale[$rating]; //this works for min

    } else {
        $min = min($ratings);

        if (isset($scale[$min])) {
            return $scale[$min]." ($count)";
        } else {
            return "$min ($count)";    // Should never happen, hopefully
        }
    }
}


/**
 * Return the sum or total of ratings of a post given to the current user by others.
 * Scale is an array of possible ratings in the scale
 * Ratings is an optional simple array of actual ratings (just integers)
 */
function forum_get_ratings_sum($postid, $scale, $ratings=NULL) {

    if (is_null($ratings)) {
        $ratings = array();
        if ($rates = get_records("forum_ratings", "post", $postid)) {
            foreach ($rates as $rate) {
                $ratings[] = $rate->rating;
            }
        }
    }

    $count = count($ratings);
    $scalecount = count($scale)-1; //this should give us the last element of the scale aka the max grade with  $scale[$scalecount]

    if ($count == 0 ) {
        return "";

    } else if ($count == 1) { //this works for max.
        $rating = reset($ratings);
        return $scale[$rating];

    } else {
        $total = 0;
        foreach ($ratings as $rating) {
            $total += $rating;
        }
        if ($total > $scale[$scalecount]) { //if the total exceeds the max grade then set it to the max grade
            $total = $scale[$scalecount];
        }
        if (isset($scale[$total])) {
            return $scale[$total]." ($count)";
        } else {
            return "$total ($count)";    // Should never happen, hopefully
        }
    }
}

/**
 * Return a summary of post ratings given to the current user by others.
 * Scale is an array of possible ratings in the scale
 * Ratings is an optional simple array of actual ratings (just integers)
 */
function forum_get_ratings_summary($postid, $scale, $ratings=NULL) {

    if (is_null($ratings)) {
        $ratings = array();
        if ($rates = get_records("forum_ratings", "post", $postid)) {
            foreach ($rates as $rate) {
                $rating[] = $rate->rating;
            }
        }
    }


    if (!$count = count($ratings)) {
        return "";
    }


    foreach ($scale as $key => $scaleitem) {
        $sumrating[$key] = 0;
    }

    foreach ($ratings as $rating) {
        $sumrating[$rating]++;
    }

    $summary = "";
    foreach ($scale as $key => $scaleitem) {
        $summary = $sumrating[$key].$summary;
        if ($key > 1) {
            $summary = "/$summary";
        }
    }
    return $summary;
}

/**
 * Print the menu of ratings as part of a larger form.
 * If the post has already been - set that value.
 * Scale is an array of ratings
 */
function forum_print_rating_menu($postid, $userid, $scale, $myrating=NULL) {

    static $strrate;

    if (is_null($myrating)) {
        if (!$rating = get_record("forum_ratings", "userid", $userid, "post", $postid)) {
            $myrating = FORUM_UNSET_POST_RATING;
        } else {
            $myrating = $rating->rating;
        }
    }

    if (empty($strrate)) {
        $strrate = get_string("rate", "forum");
    }
    $scale = array(FORUM_UNSET_POST_RATING => $strrate.'...') + $scale;
    choose_from_menu($scale, $postid, $myrating, '', '', '0', false, false, 0, '', false, false, 'forumpostratingmenu');
}

/**
 * Print the drop down that allows the user to select how they want to have
 * the discussion displayed.
 * @param $id - forum id if $forumtype is 'single',
 *              discussion id for any other forum type
 * @param $mode - forum layout mode
 * @param $forumtype - optional
 */
function forum_print_mode_form($id, $mode, $forumtype='') {
    if ($forumtype == 'single') {
        echo '<div class="forummode">';
        popup_form("view.php?f=$id&amp;mode=", forum_get_layout_modes(), "mode", $mode, "");
        echo '</div>';
    } else {
        popup_form("discuss.php?d=$id&amp;mode=", forum_get_layout_modes(), "mode", $mode, "");
    }
}

/**
 *
 */
function forum_search_form($course, $search='') {
    global $CFG;
// (Shirai004): ”フォーラムの検索”の高度な検索画面においてフォーラムの検索対象のデフォルトを現在のフォーラムとする改良 (2008/02/21)
// (Shirai004): 以下１行を追加
    global $forum;
// (Shirai004): ここまで

    $output  = '<div class="forumsearch">';
    $output .= '<form action="'.$CFG->wwwroot.'/mod/forum/search.php" style="display:inline">';
    $output .= '<fieldset class="invisiblefieldset">';
    $output .= helpbutton('search', get_string('search'), 'moodle', true, false, '', true);
    $output .= '<input name="search" type="text" size="18" value="'.s($search, true).'" alt="search" />';
    $output .= '<input value="'.get_string('searchforums', 'forum').'" type="submit" />';
    $output .= '<input name="id" type="hidden" value="'.$course->id.'" />';
// (Shirai004): 以下１行を追加
    if (!empty($forum->id)) $output .= '<input name="frmid" type="hidden" value="'.$forum->id.'" />';
// (Shirai004): ここまで
    $output .= '</fieldset>';
    $output .= '</form>';
    $output .= '</div>';

    return $output;
}


/**
 *
 */
function forum_set_return() {
    global $CFG, $SESSION;

    if (! isset($SESSION->fromdiscussion)) {
        if (!empty($_SERVER['HTTP_REFERER'])) {
            $referer = $_SERVER['HTTP_REFERER'];
        } else {
            $referer = "";
        }
        // If the referer is NOT a login screen then save it.
        if (! strncasecmp("$CFG->wwwroot/login", $referer, 300)) {
            $SESSION->fromdiscussion = $_SERVER["HTTP_REFERER"];
        }
    }
}


/**
 *
 */
function forum_go_back_to($default) {
    global $SESSION;

    if (!empty($SESSION->fromdiscussion)) {
        $returnto = $SESSION->fromdiscussion;
        unset($SESSION->fromdiscussion);
        return $returnto;
    } else {
        return $default;
    }
}

/**
 * Creates a directory file name, suitable for make_upload_directory()
 */
function forum_file_area_name($post) {
    global $CFG;

    if (!isset($post->forum) or !isset($post->course)) {
        debugging('missing forum or course', DEBUG_DEVELOPER);
        if (!$discussion = get_record('forum_discussions', 'id', $post->discussion)) {
            return false;
        }
        if (!$forum = get_record('forum', 'id', $discussion->forum)) {
            return false;
        }
        $forumid  = $forum->id;
        $courseid = $forum->course;
    } else {
        $forumid  = $post->forum;
        $courseid = $post->course;
    }

    return "$courseid/$CFG->moddata/forum/$forumid/$post->id";
}

/**
 *
 */
function forum_file_area($post) {
    $path = forum_file_area_name($post);
    if ($path) {
        return make_upload_directory($path);
    } else {
        return false;
    }
}

/**
 *
 */
function forum_delete_old_attachments($post, $exception="") {

/**
 * Deletes all the user files in the attachments area for a post
 * EXCEPT for any file named $exception
 */
    if ($basedir = forum_file_area($post)) {
        if ($files = get_directory_list($basedir)) {
            foreach ($files as $file) {
                if ($file != $exception) {
// (FS_CONVERTER): ここから
//                  unlink("$basedir/$file");
                    fs_unlink("$basedir/$file");
// (FS_CONVERTER): ここまで
                    notify("Existing file '$file' has been deleted!");
                }
            }
        }
        if (!$exception) {  // Delete directory as well, if empty
// (FS_CONVERTER): ここから
//          rmdir("$basedir");
            fs_rmdir("$basedir");
// (FS_CONVERTER): ここまで
        }
    }
}

/**
 * Given a discussion object that is being moved to forumid,
 * this function checks all posts in that discussion
 * for attachments, and if any are found, these are
 * moved to the new forum directory.
 */
function forum_move_attachments($discussion, $forumid) {

    global $CFG;

    require_once($CFG->dirroot.'/lib/uploadlib.php');

    $return = true;

    if ($posts = get_records_select("forum_posts", "discussion = '$discussion->id' AND attachment <> ''")) {
        foreach ($posts as $oldpost) {
            $oldpost->course = $discussion->course;
            $oldpost->forum = $discussion->forum;
            $oldpostdir = "$CFG->dataroot/".forum_file_area_name($oldpost);
            if (is_dir($oldpostdir)) {
                $newpost = $oldpost;
                $newpost->forum = $forumid;
                $newpostdir = forum_file_area_name($newpost);
                // take off the last directory because otherwise we're renaming to a directory that already exists
                // and this is unhappy in certain situations, eg over an nfs mount and potentially on windows too.
                make_upload_directory(substr($newpostdir,0,strrpos($newpostdir,'/')));
                $newpostdir = $CFG->dataroot.'/'.forum_file_area_name($newpost);
                $files = get_directory_list($oldpostdir); // get it before we rename it.
                if (! @rename($oldpostdir, $newpostdir)) {
                    $return = false;
                }
                foreach ($files as $file) {
                    clam_change_log($oldpostdir.'/'.$file,$newpostdir.'/'.$file);
                }
            }
        }
    }
    return $return;
}

/**
 * if return=html, then return a html string.
 * if return=text, then return a text-only string.
 * otherwise, print HTML for non-images, and return image HTML
 */
function forum_print_attachments($post, $return=NULL) {

    global $CFG;
// (Shirai088): フォーラムのスレッドをZIPファイルで出力するフォーラムダンプ機能の追加 (2008/08/29)
// (Shirai088): ここから追加
    global $forumdump;
    if (!isset($forumdump)) $forumdump = 0;
// (Shirai088): ここまで追加

    $filearea = forum_file_area_name($post);

    $imagereturn = "";
    $output = "";

    if ($basedir = forum_file_area($post)) {
        if ($files = get_directory_list($basedir)) {
            $strattachment = get_string("attachment", "forum");
            foreach ($files as $file) {
                $icon = mimeinfo("icon", $file);
                $type = mimeinfo("type", $file);
                $ffurl = get_file_url("$filearea/$file");
                $image = "<img src=\"$CFG->pixpath/f/$icon\" class=\"icon\" alt=\"\" />";
// (Shirai088): ここから追加
                if ($forumdump) {
                    global $fsCFG;
                    $attachpath = "$fsCFG->fdump_attpath/$post->id";
                    if (!fs_file_exists($attachpath)) fs_mkdir($attachpath);
                    fs_copy("$CFG->dataroot/$post->course/$CFG->moddata/forum/$post->forum/$post->id/$file", "$attachpath/$file");
                    $ffurl = convert_download_filename_encoding("attachment/$post->id/$file");
                    fs_copy("$CFG->pixpath/f/$icon", "$fsCFG->fdump_iconpath/$icon");
                    $image = "<img src=\"icon/$icon\" class=\"icon\" alt=\"\" />";
                }
// (Shirai088): ここまで追加

                if ($return == "html") {
                    $output .= "<a href=\"$ffurl\">$image</a> ";
                    $output .= "<a href=\"$ffurl\">$file</a><br />";

                } else if ($return == "text") {
                    $output .= "$strattachment $file:\n$ffurl\n";

                } else {
                    if (in_array($type, array('image/gif', 'image/jpeg', 'image/png'))) {    // Image attachments don't get printed as links
// (Shirai189): フォーラムの貼付画像のサイズを制限する機能の追加 (2010/05/20)
// (Shirai189): ここからコメントアウト
//                      $imagereturn .= "<br /><img src=\"$ffurl\" alt=\"\" />";
// (Shirai189): ここから追加
                        $imagereturn .= "<br /><img ".fs_image_width_height("{$CFG->dataroot}/$filearea/$file")." src=\"$ffurl\" alt=\"\" />";
// (Shirai189): ここまで追加
                    } else {
                        echo "<a href=\"$ffurl\">$image</a> ";
                        echo filter_text("<a href=\"$ffurl\">$file</a><br />");
                    }
                }
            }
        }
    }

    if ($return) {
        return $output;
    }

    return $imagereturn;
}
/**
 * If successful, this function returns the name of the file
 * @param $post is a full post record, including course and forum
 * @param $newfile is a full upload array from $_FILES
 * @param $message is a string to hold the messages.
 */

/**
 *
 */
function forum_add_attachment($post, $inputname,&$message) {

    global $CFG;

    if (!$forum = get_record("forum", "id", $post->forum)) {
        return "";
    }

    if (!$course = get_record("course", "id", $forum->course)) {
        return "";
    }

    require_once($CFG->dirroot.'/lib/uploadlib.php');
    $um = new upload_manager($inputname,true,false,$course,false,$forum->maxbytes,true,true);
    $dir = forum_file_area_name($post);
    if ($um->process_file_uploads($dir)) {
        $message .= $um->get_errors();
        return $um->get_new_filename();
    }
    $message .= $um->get_errors();
    return null;
}

/**
 *
 */
function forum_add_new_post($post,&$message) {

    global $USER, $CFG;

    $discussion = get_record('forum_discussions', 'id', $post->discussion);
    $forum      = get_record('forum', 'id', $discussion->forum);

    $post->created    = $post->modified = time();
    $post->mailed     = "0";
    $post->userid     = $USER->id;
    $post->attachment = "";
    $post->forum      = $forum->id;     // speedup
    $post->course     = $forum->course; // speedup

    if (! $post->id = insert_record("forum_posts", $post)) {
        return false;
    }

    if ($post->attachment = forum_add_attachment($post, 'attachment',$message)) {
// (Shirai100): フォーラムの添付ファイルにシングルクオートなどの特殊文字を含むファイル名のファイルを添付できない制限の改良 (2008/11/02)
// (Shirai100): ここから
//      set_field("forum_posts", "attachment", $post->attachment, "id", $post->id);
        set_field("forum_posts", "attachment", addslashes($post->attachment), "id", $post->id);
// (Shirai100): ここまで
    }

    // Update discussion modified date
    set_field("forum_discussions", "timemodified", $post->modified, "id", $post->discussion);
    set_field("forum_discussions", "usermodified", $post->userid, "id", $post->discussion);

    if (forum_tp_can_track_forums($forum) && forum_tp_is_tracked($forum)) {
        forum_tp_mark_post_read($post->userid, $post, $post->forum);
    }

    return $post->id;
}

/**
 *
 */
function forum_update_post($post,&$message) {

    global $USER, $CFG;

    $forum = get_record('forum', 'id', $post->forum);

    $post->modified = time();

    $updatediscussion = new object();
    $updatediscussion->id           = $post->discussion;
    $updatediscussion->timemodified = $post->modified; // last modified tracking
    $updatediscussion->usermodified = $post->userid;   // last modified tracking

    if (!$post->parent) {   // Post is a discussion starter - update discussion title and times too
        $updatediscussion->name      = $post->subject;
        $updatediscussion->timestart = $post->timestart;
        $updatediscussion->timeend   = $post->timeend;
    }

    if (!update_record('forum_discussions', $updatediscussion)) {
        return false;
    }

    if ($newfilename = forum_add_attachment($post, 'attachment',$message)) {
        $post->attachment = $newfilename;
    } else {
        unset($post->attachment);
    }

    if (forum_tp_can_track_forums($forum) && forum_tp_is_tracked($forum)) {
        forum_tp_mark_post_read($post->userid, $post, $post->forum);
    }

// (Shirai100): フォーラムの添付ファイルにシングルクオートなどの特殊文字を含むファイル名のファイルを添付できない制限の改良 (2008/11/02)
// (Shirai100): ここから追加
    if (!empty($post->attachment)) {
        $post->attachment = addslashes($post->attachment);
    }
// (Shirai100): ここまで追加
    return update_record('forum_posts', $post);
}

/**
 * Given an object containing all the necessary data,
 * create a new discussion and return the id
 */
function forum_add_discussion($discussion,&$message) {

    global $USER, $CFG;

    $timenow = time();

    // The first post is stored as a real post, and linked
    // to from the discuss entry.

    $forum = get_record('forum', 'id', $discussion->forum);

    $post = new object();
    $post->discussion  = 0;
    $post->parent      = 0;
    $post->userid      = $USER->id;
    $post->created     = $timenow;
    $post->modified    = $timenow;
    $post->mailed      = 0;
    $post->subject     = $discussion->name;
    $post->message     = $discussion->intro;
    $post->attachment  = "";
    $post->forum       = $forum->id;     // speedup
    $post->course      = $forum->course; // speedup
    $post->format      = $discussion->format;
    $post->mailnow     = $discussion->mailnow;

    if (! $post->id = insert_record("forum_posts", $post) ) {
        return 0;
    }

    if ($post->attachment = forum_add_attachment($post, 'attachment',$message)) {
        set_field("forum_posts", "attachment", $post->attachment, "id", $post->id); //ignore errors
    }

    // Now do the main entry for the discussion,
    // linking to this first post

    $discussion->firstpost    = $post->id;
    $discussion->timemodified = $timenow;
    $discussion->usermodified = $post->userid;
    $discussion->userid = $USER->id;

    if (! $post->discussion = insert_record("forum_discussions", $discussion) ) {
        delete_records("forum_posts", "id", $post->id);
        return 0;
    }

    // Finally, set the pointer on the post.
    if (! set_field("forum_posts", "discussion", $post->discussion, "id", $post->id)) {
        delete_records("forum_posts", "id", $post->id);
        delete_records("forum_discussions", "id", $post->discussion);
        return 0;
    }

    if (forum_tp_can_track_forums($forum) && forum_tp_is_tracked($forum)) {
        forum_tp_mark_post_read($post->userid, $post, $post->forum);
    }

    return $post->discussion;
}


/**
 *
 */
function forum_delete_discussion($discussion, $fulldelete=false) {
// $discussion is a discussion record object

    $result = true;

    if ($posts = get_records("forum_posts", "discussion", $discussion->id)) {
        foreach ($posts as $post) {
            $post->course = $discussion->course;
            $post->forum  = $discussion->forum;
            if (! delete_records("forum_ratings", "post", "$post->id")) {
                $result = false;
            }
            if (! forum_delete_post($post, $fulldelete)) {
                $result = false;
            }
        }
    }

    forum_tp_delete_read_records(-1, -1, $discussion->id);

    if (! delete_records("forum_discussions", "id", "$discussion->id")) {
        $result = false;
    }

    return $result;
}


/**
 *
 */
function forum_delete_post($post, $children=false) {
   if ($childposts = get_records('forum_posts', 'parent', $post->id)) {
       if ($children) {
           foreach ($childposts as $childpost) {
               forum_delete_post($childpost, true);
           }
       } else {
           return false;
       }
   }
   if (delete_records("forum_posts", "id", $post->id)) {
       delete_records("forum_ratings", "post", $post->id);  // Just in case

       forum_tp_delete_read_records(-1, $post->id);

       if ($post->attachment) {
           $discussion = get_record("forum_discussions", "id", $post->discussion);
           $post->course = $discussion->course;
           $post->forum  = $discussion->forum;
           forum_delete_old_attachments($post);
       }

   // Just in case we are deleting the last post
       forum_discussion_update_last_post($post->discussion);

       return true;
   }
   return false;
}

/**
 *
 */
function forum_count_replies($post, $children=true) {
    $count = 0;

    if ($children) {
        if ($childposts = get_records('forum_posts', 'parent', $post->id)) {
           foreach ($childposts as $childpost) {
               $count ++;                   // For this child
               $count += forum_count_replies($childpost, true);
           }
        }
    } else {
        $count += count_records('forum_posts', 'parent', $post->id);
    }

    return $count;
}


/**
 *
 */
function forum_forcesubscribe($forumid, $value=1) {
    return set_field("forum", "forcesubscribe", $value, "id", $forumid);
}

/**
 *
 */
function forum_is_forcesubscribed($forum) {
    if (isset($forum->forcesubscribe)) {    // then we use that
        return ($forum->forcesubscribe == FORUM_FORCESUBSCRIBE);
    } else {   // Check the database
       return (get_field('forum', 'forcesubscribe', 'id', $forum) == FORUM_FORCESUBSCRIBE);
    }
}

/**
 *
 */
function forum_is_subscribed($userid, $forum) {
    if (is_numeric($forum)) {
        $forum = get_record('forum', 'id', $forum);
    }
    if (forum_is_forcesubscribed($forum)) {
        return true;
    }
    return record_exists("forum_subscriptions", "userid", $userid, "forum", $forum->id);
}

function forum_get_subscribed_forums($course) {
    global $USER, $CFG;
    $sql = "SELECT f.id
              FROM {$CFG->prefix}forum f
                   LEFT JOIN {$CFG->prefix}forum_subscriptions fs ON (fs.forum = f.id AND fs.userid = $USER->id)
             WHERE f.forcesubscribe <> ".FORUM_DISALLOWSUBSCRIBE."
                   AND (f.forcesubscribe = ".FORUM_FORCESUBSCRIBE." OR fs.id IS NOT NULL)";
    if ($subscribed = get_records_sql($sql)) {
        foreach ($subscribed as $s) {
            $subscribed[$s->id] = $s->id;
        }
        return $subscribed;
    } else {
        return array();
    }
}

/**
 * Adds user to the subscriber list
 */
function forum_subscribe($userid, $forumid) {

    if (record_exists("forum_subscriptions", "userid", $userid, "forum", $forumid)) {
        return true;
    }

    $sub = new object();
    $sub->userid  = $userid;
    $sub->forum = $forumid;

    return insert_record("forum_subscriptions", $sub);
}

/**
 * Removes user from the subscriber list
 */
function forum_unsubscribe($userid, $forumid) {
    return delete_records("forum_subscriptions", "userid", $userid, "forum", $forumid);
}

/**
 * Given a new post, subscribes or unsubscribes as appropriate.
 * Returns some text which describes what happened.
 */
function forum_post_subscription($post, $forum) {

    global $USER;
    
    $action = '';
    $subscribed = forum_is_subscribed($USER->id, $forum);
    
    if ($forum->forcesubscribe == FORUM_FORCESUBSCRIBE) { // database ignored
        return "";

    } elseif (($forum->forcesubscribe == FORUM_DISALLOWSUBSCRIBE)
        && !has_capability('moodle/course:manageactivities', get_context_instance(CONTEXT_COURSE, $forum->course), $USER->id)) {
        if ($subscribed) {
            $action = 'unsubscribe'; // sanity check, following MDL-14558
        } else {
            return "";
        }

    } else { // go with the user's choice
        if (isset($post->subscribe)) {
            // no change
            if ((!empty($post->subscribe) && $subscribed)
                || (empty($post->subscribe) && !$subscribed)) {
                return "";

            } elseif (!empty($post->subscribe) && !$subscribed) {
                $action = 'subscribe';

            } elseif (empty($post->subscribe) && $subscribed) {
                $action = 'unsubscribe';
            }
        }
    }

    $info = new object();
    $info->name  = fullname($USER);
    $info->forum = format_string($forum->name);

    switch ($action) {
        case 'subscribe':
            forum_subscribe($USER->id, $post->forum);
            return "<p>".get_string("nowsubscribed", "forum", $info)."</p>";
        case 'unsubscribe':
            forum_unsubscribe($USER->id, $post->forum);
            return "<p>".get_string("nownotsubscribed", "forum", $info)."</p>";
    }
}

/**
 * Generate and return the subscribe or unsubscribe link for a forum.
 * @param object $forum the forum. Fields used are $forum->id and $forum->forcesubscribe.
 * @param object $context the context object for this forum.
 * @param array $messages text used for the link in its various states
 *      (subscribed, unsubscribed, forcesubscribed or cantsubscribe).
 *      Any strings not passed in are taken from the $defaultmessages array
 *      at the top of the function.
 * @param
 */
function forum_get_subscribe_link($forum, $context, $messages = array(), $cantaccessagroup = false, $fakelink=true, $backtoindex=false, $subscribed_forums=null) {
    global $CFG, $USER;
    $defaultmessages = array(
        'subscribed' => get_string('unsubscribe', 'forum'),
        'unsubscribed' => get_string('subscribe', 'forum'),
        'cantaccessgroup' => get_string('no'),
        'forcesubscribed' => get_string('everyoneissubscribed', 'forum'),
        'cantsubscribe' => get_string('disallowsubscribe','forum')
    );
    $messages = $messages + $defaultmessages;

    if (forum_is_forcesubscribed($forum)) {
        return $messages['forcesubscribed'];
    } else if ($forum->forcesubscribe == FORUM_DISALLOWSUBSCRIBE && !has_capability('mod/forum:managesubscriptions', $context)) {
        return $messages['cantsubscribe'];
    } else if ($cantaccessagroup) {
        return $messages['cantaccessgroup'];
    } else {
        if (is_null($subscribed_forums)) {
            $subscribed = forum_is_subscribed($USER->id, $forum);
        } else {
            $subscribed = !empty($subscribed_forums[$forum->id]);
        }
        if ($subscribed) {
            $linktext = $messages['subscribed'];
            $linktitle = get_string('subscribestop', 'forum');
        } else {
            $linktext = $messages['unsubscribed'];
            $linktitle = get_string('subscribestart', 'forum');
        }

        $options = array();
        if ($backtoindex) {
            $backtoindexlink = '&amp;backtoindex=1';
            $options['backtoindex'] = 1;
        } else {
            $backtoindexlink = '';
        }
        $link = '';
        $sesskeylink = '&amp;sesskey='.sesskey();

        if ($fakelink) {
            $link .= <<<EOD
<script type="text/javascript">
//<![CDATA[
var subs_link = document.getElementById("subscriptionlink");
if(subs_link){
    subs_link.innerHTML = "<a title=\"$linktitle\" href='$CFG->wwwroot/mod/forum/subscribe.php?id={$forum->id}{$backtoindexlink}{$sesskeylink}'>$linktext<\/a>";
}
//]]>
</script>
<noscript>
EOD;
        }
        $options['id'] = $forum->id;
        $options['sesskey'] = sesskey();
        $link .= print_single_button($CFG->wwwroot . '/mod/forum/subscribe.php',
                $options, $linktext, 'post', '_self', true, $linktitle);
        if ($fakelink) {
            $link .= '</noscript>';
        }

        return $link;
    }
}


/**
 * Generate and return the track or no track link for a forum.
 * @param object $forum the forum. Fields used are $forum->id and $forum->forcesubscribe.
 */
function forum_get_tracking_link($forum, $messages=array(), $fakelink=true) {
    global $CFG, $USER;

    static $strnotrackforum, $strtrackforum;

    if (isset($messages['trackforum'])) {
         $strtrackforum = $messages['trackforum'];
    }
    if (isset($messages['notrackforum'])) {
         $strnotrackforum = $messages['notrackforum'];
    }
    if (empty($strtrackforum)) {
        $strtrackforum = get_string('trackforum', 'forum');
    }
    if (empty($strnotrackforum)) {
        $strnotrackforum = get_string('notrackforum', 'forum');
    }

    if (forum_tp_is_tracked($forum)) {
        $linktitle = $strnotrackforum;
        $linktext = $strnotrackforum;
    } else {
        $linktitle = $strtrackforum;
        $linktext = $strtrackforum;
    } 

    $link = '';
    if ($fakelink) {
        $link .= '<script type="text/javascript">';
        $link .= '//<![CDATA['."\n";
        $link .= 'document.getElementById("trackinglink").innerHTML = "<a title=\"' . $linktitle . '\" href=\"' . $CFG->wwwroot .
           '/mod/forum/settracking.php?id=' . $forum->id . '\">' . $linktext . '<\/a>";'."\n";
        $link .= '//]]>'."\n";
        $link .= '</script>';
        // use <noscript> to print button in case javascript is not enabled
        $link .= '<noscript>';
    }
    $link .= print_single_button($CFG->wwwroot . '/mod/forum/settracking.php?id=' . $forum->id,
            '', $linktext, 'post', '_self', true, $linktitle);
    if ($fakelink) {
        $link .= '</noscript>';
    }

    return $link;
}



/**
 * Returns true if user created new discussion already
 * @param int $forumid
 * @param int $userid
 * @return bool
 */
function forum_user_has_posted_discussion($forumid, $userid) {
    global $CFG;

    $sql = "SELECT 'x'
              FROM {$CFG->prefix}forum_discussions d, {$CFG->prefix}forum_posts p
             WHERE d.forum = $forumid AND p.discussion = d.id AND p.parent = 0 and p.userid = $userid";

    return record_exists_sql($sql);
}

/**
 *
 */
function forum_discussions_user_has_posted_in($forumid, $userid) {
    global $CFG;

    $haspostedsql = "SELECT d.id AS id,
                            d.*
                       FROM {$CFG->prefix}forum_posts p,
                            {$CFG->prefix}forum_discussions d
                      WHERE p.discussion = d.id
                        AND d.forum = $forumid
                        AND p.userid = $userid";

    return get_records_sql($haspostedsql);
}

/**
 *
 */
function forum_user_has_posted($forumid, $did, $userid) {
    global $CFG;

    if (empty($did)) {
        // posted in any forum discussion?
        $sql = "SELECT 'x'
                  FROM {$CFG->prefix}forum_posts p
                  JOIN {$CFG->prefix}forum_discussions d ON d.id = p.discussion
                 WHERE p.userid = $userid AND d.forum = $forumid";
        return record_exists_sql($sql);
    } else {
        // started discussion?
        return record_exists('forum_posts','discussion',$did,'userid',$userid);
    }
}

/**
 *
 */
function forum_user_can_post_discussion($forum, $currentgroup=null, $unused=-1, $cm=NULL, $context=NULL) {
// $forum is an object
    global $USER;

    // shortcut - guest and not-logged-in users can not post
    if (isguestuser() or !isloggedin()) {
        return false;
    }

    if (!$cm) {
        debugging('missing cm', DEBUG_DEVELOPER);
        if (!$cm = get_coursemodule_from_instance('forum', $forum->id, $forum->course)) {
            error('Course Module ID was incorrect');
        }
    }

    if (!$context) {
        $context = get_context_instance(CONTEXT_MODULE, $cm->id);
    }

    if ($currentgroup === null) {
        $currentgroup = groups_get_activity_group($cm);
    }

    $groupmode = groups_get_activity_groupmode($cm);

    if ($forum->type == 'news') {
        $capname = 'mod/forum:addnews';
    } else {
        $capname = 'mod/forum:startdiscussion';
    }

    if (!has_capability($capname, $context)) {
        return false;
    }

    if ($forum->type == 'single') {
        return false;
    }

    if ($forum->type == 'eachuser') {
        if (forum_user_has_posted_discussion($forum->id, $USER->id)) {
            return false;
        }
    }

    if (!$groupmode or has_capability('moodle/site:accessallgroups', $context)) {
        return true;
    }

    if ($currentgroup) {
        return groups_is_member($currentgroup);
    } else {
        // no group membership and no accessallgroups means no new discussions
        // reverted to 1.7 behaviour in 1.9+,  buggy in 1.8.0-1.9.0
        return false;
    }
}

/**
 * This function checks whether the user can reply to posts in a forum
 * discussion. Use forum_user_can_post_discussion() to check whether the user
 * can start dicussions.
 * @param $forum - forum object
 * @param $user - user object
 */
function forum_user_can_post($forum, $discussion, $user=NULL, $cm=NULL, $course=NULL, $context=NULL) {
    global $USER;
    if (empty($user)) {
        $user = $USER;
    }

    // shortcut - guest and not-logged-in users can not post
    if (isguestuser($user) or empty($user->id)) {
        return false;
    }

    if (!isset($discussion->groupid)) {
        debugging('incorrect discussion parameter', DEBUG_DEVELOPER);
        return false;
    }

    if (!$cm) {
        debugging('missing cm', DEBUG_DEVELOPER);
        if (!$cm = get_coursemodule_from_instance('forum', $forum->id, $forum->course)) {
            error('Course Module ID was incorrect');
        }
    }

    if (!$course) {
        debugging('missing course', DEBUG_DEVELOPER);
        if (!$course = get_record('course', 'id', $forum->course)) {
            error('Incorrect course id');
        }
    }

    if (!$context) {
        $context = get_context_instance(CONTEXT_MODULE, $cm->id);
    }

    // normal users with temporary guest access can not post
    if (has_capability('moodle/legacy:guest', $context, $user->id, false)) {
        return false;
    }

    if ($forum->type == 'news') {
        $capname = 'mod/forum:replynews';
    } else {
        $capname = 'mod/forum:replypost';
    }

    if (!has_capability($capname, $context, $user->id, false)) {
        return false;
    }

    if (!$groupmode = groups_get_activity_groupmode($cm, $course)) {
        return true;
    }

    if (has_capability('moodle/site:accessallgroups', $context)) {
        return true;
    }

    if ($groupmode == VISIBLEGROUPS) {
        if ($discussion->groupid == -1) {
            // allow students to reply to all participants discussions - this was not possible in Moodle <1.8
            return true;
        }
        return groups_is_member($discussion->groupid);

    } else {
        //separate groups
        if ($discussion->groupid == -1) {
            return false;
        }
        return groups_is_member($discussion->groupid);
    }
}


//checks to see if a user can view a particular post
function forum_user_can_view_post($post, $course, $cm, $forum, $discussion, $user=NULL){

    global $CFG, $USER;

    if (!$user){
        $user = $USER;
    }

    $modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);
    if (!has_capability('mod/forum:viewdiscussion', $modcontext)) {
        return false;
    }

// If it's a grouped discussion, make sure the user is a member
    if ($discussion->groupid > 0) {
        $groupmode = groups_get_activity_groupmode($cm);
        if ($groupmode == SEPARATEGROUPS) {
            return groups_is_member($discussion->groupid) || has_capability('moodle/site:accessallgroups', $modcontext);
        }
    }
    return true;
}


/**
 *
 */
function forum_user_can_see_discussion($forum, $discussion, $context, $user=NULL) {
    global $USER;

    if (empty($user) || empty($user->id)) {
        $user = $USER;
    }

    // retrieve objects (yuk)
    if (is_numeric($forum)) {
        debugging('missing full forum', DEBUG_DEVELOPER);
        if (!$forum = get_record('forum','id',$forum)) {
            return false;
        }
    }
    if (is_numeric($discussion)) {
        debugging('missing full discussion', DEBUG_DEVELOPER);
        if (!$discussion = get_record('forum_discussions','id',$discussion)) {
            return false;
        }
    }

    if (!has_capability('mod/forum:viewdiscussion', $context)) {
        return false;
    }

    if ($forum->type == 'qanda' &&
            !forum_user_has_posted($forum->id, $discussion->id, $user->id) &&
            !has_capability('mod/forum:viewqandawithoutposting', $context)) {
        return false;
    }
    return true;
}


/**
 *
 */
function forum_user_can_see_post($forum, $discussion, $post, $user=NULL, $cm=NULL) {
    global $CFG, $USER;

    // retrieve objects (yuk)
    if (is_numeric($forum)) {
        debugging('missing full forum', DEBUG_DEVELOPER);
        if (!$forum = get_record('forum','id',$forum)) {
            return false;
        }
    }

    if (is_numeric($discussion)) {
        debugging('missing full discussion', DEBUG_DEVELOPER);
        if (!$discussion = get_record('forum_discussions','id',$discussion)) {
            return false;
        }
    }
    if (is_numeric($post)) {
        debugging('missing full post', DEBUG_DEVELOPER);
        if (!$post = get_record('forum_posts','id',$post)) {
            return false;
        }
    }
    if (!isset($post->id) && isset($post->parent)) {
        $post->id = $post->parent;
    }

    if (!$cm) {
        debugging('missing cm', DEBUG_DEVELOPER);
        if (!$cm = get_coursemodule_from_instance('forum', $forum->id, $forum->course)) {
            error('Course Module ID was incorrect');
        }
    }

    if (empty($user) || empty($user->id)) {
        $user = $USER;
    }

    if (isset($cm->cache->caps['mod/forum:viewdiscussion'])) {
        if (!$cm->cache->caps['mod/forum:viewdiscussion']) {
            return false;
        }
    } else {
        $modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);
        if (!has_capability('mod/forum:viewdiscussion', $modcontext, $user->id)) {
            return false;
        }
    }

    if (isset($cm->uservisible)) {
        if (!$cm->uservisible) {
            return false;
        }
    } else {
        if (!coursemodule_visible_for_user($cm, $user->id)) {
            return false;
        }
    }

    if ($forum->type == 'qanda') {
        $firstpost = forum_get_firstpost_from_discussion($discussion->id);
        $modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);
        $userfirstpost = forum_get_user_posted_time($discussion->id, $user->id);

        return (($userfirstpost !== false && (time() - $userfirstpost >= $CFG->maxeditingtime)) ||
                $firstpost->id == $post->id || $post->userid == $user->id || $firstpost->userid == $user->id ||
                has_capability('mod/forum:viewqandawithoutposting', $modcontext, $user->id, false));
    }
    return true;
}


/**
 * Prints the discussion view screen for a forum.
 *
 * @param object $course The current course object.
 * @param object $forum Forum to be printed.
 * @param int $maxdiscussions .
 * @param string $displayformat The display format to use (optional).
 * @param string $sort Sort arguments for database query (optional).
 * @param int $groupmode Group mode of the forum (optional).
 * @param void $unused (originally current group)
 * @param int $page Page mode, page to display (optional).
 * @param int perpage The maximum number of discussions per page(optional)
 *
 */
function forum_print_latest_discussions($course, $forum, $maxdiscussions=-1, $displayformat='plain', $sort='',
                                        $currentgroup=-1, $groupmode=-1, $page=-1, $perpage=100, $cm=NULL) {
    global $CFG, $USER;

// (Shirai003) フォーラムのトピック一覧の並び順を選択可能とする改良 (2008/1/10)
// (Shirai003): ここから追加
    if (isset($_SESSION['sortorderfirstpost'])) {
        switch ($_SESSION['sortorderfirstpost']) {
          case "2": $sort = "d.firstpost"; break;
          case "3": $sort = "d.firstpost DESC"; break;
          default : $sort = '';
        }
    }
// (Shirai003): ここまで追加
    if (!$cm) {
        if (!$cm = get_coursemodule_from_instance('forum', $forum->id, $forum->course)) {
            error('Course Module ID was incorrect');
        }
    }
    $context = get_context_instance(CONTEXT_MODULE, $cm->id);

    if (empty($sort)) {
        $sort = "d.timemodified DESC";
    }

    $olddiscussionlink = false;

 // Sort out some defaults
    if ($perpage <= 0) {
        $perpage = 0;
        $page    = -1;
    }

    if ($maxdiscussions == 0) {
        // all discussions - backwards compatibility
        $page    = -1;
        $perpage = 0;
        if ($displayformat == 'plain') {
            $displayformat = 'header';  // Abbreviate display by default
        }

    } else if ($maxdiscussions > 0) {
        $page    = -1;
        $perpage = $maxdiscussions;
    }

    $fullpost = false;
    if ($displayformat == 'plain') {
        $fullpost = true;
    }


// Decide if current user is allowed to see ALL the current discussions or not

// First check the group stuff
    if ($currentgroup == -1 or $groupmode == -1) {
        $groupmode    = groups_get_activity_groupmode($cm, $course);
        $currentgroup = groups_get_activity_group($cm);
    }

// If the user can post discussions, then this is a good place to put the
// button for it. We do not show the button if we are showing site news
// and the current user is a guest.

    if (forum_user_can_post_discussion($forum, $currentgroup, $groupmode, $cm, $context) ||
        ($forum->type != 'news'
         and (isguestuser() or !isloggedin() or has_capability('moodle/legacy:guest', $context, NULL, false))) ) {

        echo '<div class="singlebutton forumaddnew">';
        echo "<form id=\"newdiscussionform\" method=\"get\" action=\"$CFG->wwwroot/mod/forum/post.php\">";
        echo '<div>';
        echo "<input type=\"hidden\" name=\"forum\" value=\"$forum->id\" />";
        echo '<input type="submit" value="';
        echo ($forum->type == 'news') ? get_string('addanewtopic', 'forum')
            : (($forum->type == 'qanda')
               ? get_string('addanewquestion','forum')
               : get_string('addanewdiscussion', 'forum'));
        echo '" />';
        echo '</div>';
        echo '</form>';
        echo "</div>\n";

    } else if (isguestuser() or !isloggedin() or $forum->type == 'news') {
        // no button and no info

    } else if ($groupmode and has_capability('mod/forum:startdiscussion', $context)) {
        // inform users why they can not post new discussion
        if ($currentgroup) {
            notify(get_string('cannotadddiscussion', 'forum'));
        } else {
            notify(get_string('cannotadddiscussionall', 'forum'));
        }
    }

// Get all the recent discussions we're allowed to see

    $getuserlastmodified = ($displayformat == 'header');

    if (! $discussions = forum_get_discussions($cm, $sort, $fullpost, null, $maxdiscussions, $getuserlastmodified, $page, $perpage) ) {
        echo '<div class="forumnodiscuss">';
        if ($forum->type == 'news') {
            echo '('.get_string('nonews', 'forum').')';
        } else if ($forum->type == 'qanda') {
            echo '('.get_string('noquestions','forum').')';
        } else {
            echo '('.get_string('nodiscussions', 'forum').')';
        }
        echo "</div>\n";
        return;
    }

// If we want paging
    if ($page != -1) {
        ///Get the number of discussions found
        $numdiscussions = forum_get_discussions_count($cm);

        ///Show the paging bar
        print_paging_bar($numdiscussions, $page, $perpage, "view.php?f=$forum->id&amp;");
        if ($numdiscussions > 1000) {
            // saves some memory on sites with very large forums
            $replies = forum_count_discussion_replies($forum->id, $sort, $maxdiscussions, $page, $perpage);
        } else {
            $replies = forum_count_discussion_replies($forum->id);
        }

    } else {
        $replies = forum_count_discussion_replies($forum->id);

        if ($maxdiscussions > 0 and $maxdiscussions <= count($discussions)) {
            $olddiscussionlink = true;
        }
    }

    $canviewparticipants = has_capability('moodle/course:viewparticipants',$context);

    $strdatestring = get_string('strftimerecentfull');

    // Check if the forum is tracked.
    if ($cantrack = forum_tp_can_track_forums($forum)) {
        $forumtracked = forum_tp_is_tracked($forum);
    } else {
        $forumtracked = false;
    }

    if ($forumtracked) {
        $unreads = forum_get_discussions_unread($cm);
    } else {
        $unreads = array();
    }

    if ($displayformat == 'header') {
        echo '<table cellspacing="0" class="forumheaderlist">';
        echo '<thead>';
        echo '<tr>';
// (Shirai180): モバイルモード時にフォーラム投稿のリスト表示画面を簡素化する改良 (2010/02/09)
// (Shirai180): ここからコメントアウト
//      echo '<th class="header topic" scope="col">'.get_string('discussion', 'forum').'</th>';
//      echo '<th class="header author" colspan="2" scope="col">'.get_string('startedby', 'forum').'</th>';
// (Shirai180): ここから追加
        echo '<th class="header topic" scope="col"';
        if (is_mobile_on()) echo ' colspan="2"';
        echo '>'.get_string('discussion', 'forum').'</th>';
        if (!is_mobile_on()) echo '<th class="header author" colspan="2" scope="col">'.get_string('startedby', 'forum').'</th>';
// (Shirai180): ここまで追加
        if ($groupmode > 0) {
            echo '<th class="header group" scope="col">'.get_string('group').'</th>';
        }
        if (has_capability('mod/forum:viewdiscussion', $context)) {
            echo '<th class="header replies" scope="col">'.get_string('replies', 'forum').'</th>';
            // If the forum can be tracked, display the unread column.
            if ($cantrack) {
                echo '<th class="header replies" scope="col">'.get_string('unread', 'forum');
                if ($forumtracked) {
                    echo '&nbsp;<a title="'.get_string('markallread', 'forum').
                         '" href="'.$CFG->wwwroot.'/mod/forum/markposts.php?f='.
                         $forum->id.'&amp;mark=read&amp;returnpage=view.php">'.
                         '<img src="'.$CFG->pixpath.'/t/clear.gif" class="iconsmall" alt="'.get_string('markallread', 'forum').'" /></a>';
                }
                echo '</th>';
            }
        }
// (Shirai003) フォーラムのトピック一覧の並び順を選択可能とする改良 (2008/1/10)
// (Shirai180): モバイルモード時にフォーラム投稿のリスト表示画面を簡素化する改良 (2010/02/09)
// (Shirai003): ここからコメントアウト
//      echo '<th class="header lastpost" scope="col">'.get_string('lastpost', 'forum').'</th>';
// (Shirai003): ここから追加
        if (!isset($_SESSION['sortorderfirstpost'])) {
            $sortorderfirstpost = 1;
        } else {
            $sortorderfirstpost = $_SESSION['sortorderfirstpost'];
        }
        $larrow = '&#x25C0;';
        if (fs_function_enable('FS_ENABLE_MOBILE_DISPLAY')) {
            $larrow = replace_htmlchar4mobile($larrow, '&lt;=');
        }
        $linklastpost = '<a title="'.get_string('sortbylastpost', 'fs_moodle')."\" href=\"subscribe.php?id=$forum->id&amp;sortorder=1\">".$larrow."</a>";
        $linkfirstpostolder = '<a title="'.get_string('sortbyfirstpostolder', 'fs_moodle')."\" href=\"subscribe.php?id=$forum->id&amp;sortorder=2\">&#x25B2;</a>";
        $linkfirstpostnewer = '<a title="'.get_string('sortbyfirstpostnewer', 'fs_moodle')."\" href=\"subscribe.php?id=$forum->id&amp;sortorder=3\">&#x25BC;</a>";
// (Shirai180): 以下，$sortordermsgをis_mobile_on()に応じて修正する改良
        $sortordermsg = '';
        switch ($sortorderfirstpost) {
          case 2:
            $sortordermsg .= $linklastpost.'&nbsp;';
            if (!is_mobile_on()) $sortordermsg .= get_string('firstpost', 'fs_moodle').'&nbsp;';
            $sortordermsg .= '(&#x25B2;/'.$linkfirstpostnewer.')';
            break;
          case 3:
            $sortordermsg .= $linklastpost.'&nbsp;';
            if (!is_mobile_on()) $sortordermsg .= get_string('firstpost', 'fs_moodle').'&nbsp;';
            $sortordermsg .= '('.$linkfirstpostolder.'/&#x25BC;)';
            break;
          case 1:
          default:
            if (!is_mobile_on()) $sortordermsg .= get_string('lastpost', 'forum').'&nbsp;';
            $sortordermsg .= '('.$linkfirstpostolder.'/'.$linkfirstpostnewer.')';
            break;
        }
        echo '<th class="header lastpost" scope="col">'.$sortordermsg.'</th>';
// (Shirai003): ここまで追加
        echo '</tr>';
        echo '</thead>';
        echo '<tbody>';
    }

    foreach ($discussions as $discussion) {
        if (!empty($replies[$discussion->discussion])) {
            $discussion->replies = $replies[$discussion->discussion]->replies;
            $discussion->lastpostid = $replies[$discussion->discussion]->lastpostid;
        } else {
            $discussion->replies = 0;
        }

        // SPECIAL CASE: The front page can display a news item post to non-logged in users.
        // All posts are read in this case.
        if (!$forumtracked) {
            $discussion->unread = '-';
        } else if (empty($USER)) {
            $discussion->unread = 0;
        } else {
            if (empty($unreads[$discussion->discussion])) {
                $discussion->unread = 0;
            } else {
                $discussion->unread = $unreads[$discussion->discussion];
            }
        }

        if (!empty($USER->id)) {
            $ownpost = ($discussion->userid == $USER->id);
        } else {
            $ownpost=false;
        }
        // Use discussion name instead of subject of first post
        $discussion->subject = $discussion->name;

        switch ($displayformat) {
            case 'header':
                if ($groupmode > 0) {
                    if (isset($groups[$discussion->groupid])) {
                        $group = $groups[$discussion->groupid];
                    } else {
                        $group = $groups[$discussion->groupid] = groups_get_group($discussion->groupid);
                    }
                } else {
                    $group = -1;
                }
                forum_print_discussion_header($discussion, $forum, $group, $strdatestring, $cantrack, $forumtracked,
                    $canviewparticipants, $context);
            break;
            default:
                $link = false;

                if ($discussion->replies) {
                    $link = true;
                } else {
                    $modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);
                    $link = forum_user_can_post($forum, $discussion, $USER, $cm, $course, $modcontext);
                }

                $discussion->forum = $forum->id;

                forum_print_post($discussion, $discussion, $forum, $cm, $course, $ownpost, 0, $link, false);
            break;
        }
    }

    if ($displayformat == "header") {
        echo '</tbody>';
        echo '</table>';
    }

    if ($olddiscussionlink) {
        if ($forum->type == 'news') {
            $strolder = get_string('oldertopics', 'forum');
        } else {
            $strolder = get_string('olderdiscussions', 'forum');
        }
        echo '<div class="forumolddiscuss">';
        echo '<a href="'.$CFG->wwwroot.'/mod/forum/view.php?f='.$forum->id.'&amp;showall=1">';
        echo $strolder.'</a> ...</div>';
    }

    if ($page != -1) { ///Show the paging bar
        print_paging_bar($numdiscussions, $page, $perpage, "view.php?f=$forum->id&amp;");
    }
}


/**
 *
 */
function forum_print_discussion($course, $cm, $forum, $discussion, $post, $mode, $canreply=NULL, $canrate=false) {

    global $USER, $CFG;

    if (!empty($USER->id)) {
        $ownpost = ($USER->id == $post->userid);
    } else {
        $ownpost = false;
    }
    if ($canreply === NULL) {
        $modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);
        $reply = forum_user_can_post($forum, $discussion, $USER, $cm, $course, $modcontext);
    } else {
        $reply = $canreply;
    }

    // $cm holds general cache for forum functions
    $cm->cache = new object();
    $cm->cache->groups      = groups_get_all_groups($course->id, 0, $cm->groupingid);
    $cm->cache->usersgroups = array();

    $posters = array();

    // preload all posts - TODO: improve...
    if ($mode == FORUM_MODE_FLATNEWEST) {
        $sort = "p.created DESC";
    } else {
        $sort = "p.created ASC";
    }

    $forumtracked = forum_tp_is_tracked($forum);
    $posts = forum_get_all_discussion_posts($discussion->id, $sort, $forumtracked);
    $post = $posts[$post->id];

    foreach ($posts as $pid=>$p) {
        $posters[$p->userid] = $p->userid;
    }

    // preload all groups of ppl that posted in this discussion
    if ($postersgroups = groups_get_all_groups($course->id, $posters, $cm->groupingid, 'gm.id, gm.groupid, gm.userid')) {
        foreach($postersgroups as $pg) {
            if (!isset($cm->cache->usersgroups[$pg->userid])) {
                $cm->cache->usersgroups[$pg->userid] = array();
            }
            $cm->cache->usersgroups[$pg->userid][$pg->groupid] = $pg->groupid;
        }
        unset($postersgroups);
    }

    $ratings = NULL;
    $ratingsmenuused = false;
    $ratingsformused = false;
    if ($forum->assessed and isloggedin()) {
        if ($scale = make_grades_menu($forum->scale)) {
            $ratings =new object();
            $ratings->scale = $scale;
            $ratings->assesstimestart = $forum->assesstimestart;
            $ratings->assesstimefinish = $forum->assesstimefinish;
            $ratings->allow = $canrate;

            if ($ratings->allow) {
                echo '<form id="form" method="post" action="rate.php">';
                echo '<div class="ratingform">';
                echo '<input type="hidden" name="forumid" value="'.$forum->id.'" />';
                echo '<input type="hidden" name="sesskey" value="'.sesskey().'" />';
                $ratingsformused = true;
            }

            // preload all ratings - one query only and minimal memory
            $cm->cache->ratings = array();
            $cm->cache->myratings = array();
            if ($postratings = forum_get_all_discussion_ratings($discussion)) {
                foreach ($postratings as $pr) {
                    if (!isset($cm->cache->ratings[$pr->postid])) {
                        $cm->cache->ratings[$pr->postid] = array();
                    }
                    $cm->cache->ratings[$pr->postid][$pr->id] = $pr->rating;
                    if ($pr->userid == $USER->id) {
                        $cm->cache->myratings[$pr->postid] = $pr->rating;
                    }
                }
                unset($postratings);
            }
        }

    }

    $post->forum = $forum->id;   // Add the forum id to the post object, later used by forum_print_post
    $post->forumtype = $forum->type;

    $post->subject = format_string($post->subject);

    $postread = !empty($post->postread);

// (Shirai088): フォーラムのスレッドをZIPファイルで出力するフォーラムダンプ機能の追加 (2008/08/29)
// (Shirai088): ここから追加
    global $forumdump;
    global $fsCFG;
    if (!isset($forumdump)) $forumdump = 0;
    if ($forumdump) {
        // フォルダの作成
        $fsCFG->fdump_rootpath = $CFG->dataroot.'/temp/forum_dump';
        if (!fs_file_exists($fsCFG->fdump_rootpath))    fs_mkdir($fsCFG->fdump_rootpath);
        $uniqid = md5(uniqid(rand(), true));
        $fsCFG->fdump_rootpath .= '/'.$uniqid;  // fdump_rootpath確定
        if (!fs_file_exists($fsCFG->fdump_rootpath))    fs_mkdir($fsCFG->fdump_rootpath);
        $fsCFG->fdump_zipbasename = mb_ereg_replace('[<>"\|:\\/\*\? ]', '_', $post->subject);
        $fsCFG->fdump_zipbasename = mb_ereg_replace('_+', '_', $fsCFG->fdump_zipbasename);
        $fsCFG->fdump_indexpath = $fsCFG->fdump_rootpath.'/'.$fsCFG->fdump_zipbasename;
        if (!fs_file_exists($fsCFG->fdump_indexpath))   fs_mkdir($fsCFG->fdump_indexpath);
        $fsCFG->fdump_csspath   = $fsCFG->fdump_indexpath.'/css';
        if (!fs_file_exists($fsCFG->fdump_csspath))     fs_mkdir($fsCFG->fdump_csspath);
        $fsCFG->fdump_attpath   = $fsCFG->fdump_indexpath.'/attachment';
        if (!fs_file_exists($fsCFG->fdump_attpath))     fs_mkdir($fsCFG->fdump_attpath);
        $fsCFG->fdump_pixpath   = $fsCFG->fdump_indexpath.'/pix';
        if (!fs_file_exists($fsCFG->fdump_pixpath))     fs_mkdir($fsCFG->fdump_pixpath);
        $fsCFG->fdump_iconpath  = $fsCFG->fdump_indexpath.'/icon';
        if (!fs_file_exists($fsCFG->fdump_iconpath))    fs_mkdir($fsCFG->fdump_iconpath);
    }
// (Shirai088): ここまで追加
    if (forum_print_post($post, $discussion, $forum, $cm, $course, $ownpost, $reply, false, $ratings,
                         '', '', $postread, true, $forumtracked)) {
        $ratingsmenuused = true;
    }

    switch ($mode) {
        case FORUM_MODE_FLATOLDEST :
        case FORUM_MODE_FLATNEWEST :
        default:
            if (forum_print_posts_flat($course, $cm, $forum, $discussion, $post, $mode, $ratings, $reply, $forumtracked, $posts)) {
                $ratingsmenuused = true;
            }
            break;

        case FORUM_MODE_THREADED :
            if (forum_print_posts_threaded($course, $cm, $forum, $discussion, $post, 0, $ratings, $reply, $forumtracked, $posts)) {
                $ratingsmenuused = true;
            }
            break;

        case FORUM_MODE_NESTED :
            if (forum_print_posts_nested($course, $cm, $forum, $discussion, $post, $ratings, $reply, $forumtracked, $posts)) {
                $ratingsmenuused = true;
            }
            break;
    }
// (Shirai088): フォーラムのスレッドをZIPファイルで出力するフォーラムダンプ機能の追加 (2008/08/29)
// (Shirai088): ここから追加
    global $fsCFG, $css_no;

    function get_php2css($matches)
    {
        global $fsCFG;
        global $CFG;
        ob_start();
        include($CFG->dirroot.'/'.$matches[1]);
        $css = ob_get_contents();
        ob_get_clean();
        $csspath = "$fsCFG->fdump_csspath/css$fsCFG->css_no.css";
        fs_file_put_contents($csspath,  $css);
        $ret = '<link rel="stylesheet" type="text/css" href="'."css/css$fsCFG->css_no.css".'" />';
        $fsCFG->css_no++;
        return $ret;
    }
    function get_css($matches)
    {
        global $fsCFG, $CFG;
        $csspath = "$fsCFG->fdump_csspath/css$fsCFG->css_no.css";
        fs_copy($CFG->dirroot.$matches[1], $csspath);
        $ret = '<link rel="stylesheet" type="text/css" href="'."css/css$fsCFG->css_no.css".'" />';
        $fsCFG->css_no++;
        return $ret;
    }
    function clean_head($matches)
    {
        return $matches[1].preg_replace("/<script.+<\/script>/s", '', $matches[2]).$matches[3];
    }
    function get_favicon($matches)
    {
        global $fsCFG, $CFG;
        $faviconpath = "$fsCFG->fdump_iconpath/favicon.ico";
        fs_copy($CFG->dirroot.$matches[1], $faviconpath);
        $ret = '<link rel="shortcut icon" href="'."icon/favicon.ico".'" />';
        return $ret;
    }

    if ($forumdump) {
        $log = ob_get_contents();
        echo '</body>';
        ob_end_clean();
        $log .= '</body>';
        // CSSの読み込み
        $fsCFG->css_no = 1;
        $log = preg_replace_callback("|<link\\s+rel=\"stylesheet\"\\s+type=\"text/css\"\\shref=\"$CFG->wwwroot([/a-zA-Z0-9._]+.css)\"\\s/>|",
            "get_css", $log);
        $log = preg_replace_callback("|<link\\s+rel=\"stylesheet\"\\s+type=\"text/css\"\\shref=\"$CFG->wwwroot([/a-zA-Z0-9._]+.php)\"\\s/>|",
            "get_php2css", $log);
        // head部の掃除：Scriptの削除
        $log = preg_replace_callback("/(<head>)(.+)(<\/head>)/s", "clean_head", $log, 1);
        // ショートカットアイコンのコピー
        $log = preg_replace_callback("|<link\\s+rel=\"shortcut\\s+icon\"\\s+href=\"$CFG->wwwroot([/a-zA-Z0-9._]+.favicon.ico)\"\\s/>|",
            "get_favicon", $log);
        // ファイルの出力
        fs_file_put_contents($fsCFG->fdump_indexpath.'/index.html', $log);
        // ZIP書庫作成
        $sjiszipflag = false;
        $files = array();
        $files[] = $fsCFG->fdump_indexpath;
        $zipname = "$fsCFG->fdump_zipbasename.zip";
        $zippath = "$CFG->dataroot/temp/forum_dump/$zipname";
        if (!zip_files($files, $zippath, $sjiszipflag)) {
            error_log("Error : Cannot create zip file");
            fulldelete($fsCFG->fdump_rootpath);
            exit;
        }
        // sweep file
        fulldelete($fsCFG->fdump_rootpath);
        require_once($CFG->libdir.'/filelib.php');
        send_temp_file($zippath, $zipname);
        return;
    }
// (Shirai088): ここまで追加

    if ($ratingsformused) {
        if ($ratingsmenuused) {
            echo '<div class="ratingsubmit">';
            echo '<input type="submit" id="forumpostratingsubmit" value="'.get_string('sendinratings', 'forum').'" />';
            if (ajaxenabled() && !empty($CFG->forum_ajaxrating)) { /// AJAX enabled, standard submission form
                $rate_ajax_config_settings = array("pixpath"=>$CFG->pixpath, "wwwroot"=>$CFG->wwwroot, "sesskey"=>sesskey());
                echo "<script type=\"text/javascript\">//<![CDATA[\n".
                     "var rate_ajax_config = " . json_encode($rate_ajax_config_settings) . ";\n".
                     "init_rate_ajax();\n".
                     "//]]></script>\n";
            }
            if ($forum->scale < 0) {
                if ($scale = get_record("scale", "id", abs($forum->scale))) {
                    print_scale_menu_helpbutton($course->id, $scale );
                }
            }
            echo '</div>';
        }

        echo '</div>';
        echo '</form>';
    }
}


/**
 *
 */
function forum_print_posts_flat($course, &$cm, $forum, $discussion, $post, $mode, $ratings, $reply, $forumtracked, $posts) {
    global $USER, $CFG;

    $link  = false;
    $ratingsmenuused = false;

    if ($mode == FORUM_MODE_FLATNEWEST) {
        $sort = "ORDER BY created DESC";
    } else {
        $sort = "ORDER BY created ASC";
    }

    foreach ($posts as $post) {
        if (!$post->parent) {
            continue;
        }
        $post->subject = format_string($post->subject);
        $ownpost = ($USER->id == $post->userid);

        $postread = !empty($post->postread);

        if (forum_print_post($post, $discussion, $forum, $cm, $course, $ownpost, $reply, $link, $ratings,
                             '', '', $postread, true, $forumtracked)) {
            $ratingsmenuused = true;
        }
    }

    return $ratingsmenuused;
}


/**
 * TODO document
 */
function forum_print_posts_threaded($course, &$cm, $forum, $discussion, $parent, $depth, $ratings, $reply, $forumtracked, $posts) {
    global $USER, $CFG;

    $link  = false;
    $ratingsmenuused = false;

    if (!empty($posts[$parent->id]->children)) {
        $posts = $posts[$parent->id]->children;

        $modcontext       = get_context_instance(CONTEXT_MODULE, $cm->id);
        $canviewfullnames = has_capability('moodle/site:viewfullnames', $modcontext);

        foreach ($posts as $post) {

            echo '<div class="indent">';
            if ($depth > 0) {
                $ownpost = ($USER->id == $post->userid);
                $post->subject = format_string($post->subject);

                $postread = !empty($post->postread);

                if (forum_print_post($post, $discussion, $forum, $cm, $course, $ownpost, $reply, $link, $ratings,
                                     '', '', $postread, true, $forumtracked)) {
                    $ratingsmenuused = true;
                }
            } else {
                if (!forum_user_can_see_post($forum, $discussion, $post, NULL, $cm)) {
                    echo "</div>\n";
                    continue;
                }
                $by = new object();
                $by->name = fullname($post, $canviewfullnames);
                $by->date = userdate($post->modified);

                if ($forumtracked) {
                    if (!empty($post->postread)) {
                        $style = '<span class="forumthread read">';
                    } else {
                        $style = '<span class="forumthread unread">';
                    }
                } else {
                    $style = '<span class="forumthread">';
                }
                echo $style."<a name=\"$post->id\"></a>".
                     "<a href=\"discuss.php?d=$post->discussion&amp;parent=$post->id\">".format_string($post->subject,true)."</a> ";
                print_string("bynameondate", "forum", $by);
                echo "</span>";
            }

            if (forum_print_posts_threaded($course, $cm, $forum, $discussion, $post, $depth-1, $ratings, $reply, $forumtracked, $posts)) {
                $ratingsmenuused = true;
            }
            echo "</div>\n";
        }
    }
    return $ratingsmenuused;
}

/**
 *
 */
function forum_print_posts_nested($course, &$cm, $forum, $discussion, $parent, $ratings, $reply, $forumtracked, $posts) {
    global $USER, $CFG;

    $link  = false;
    $ratingsmenuused = false;

    if (!empty($posts[$parent->id]->children)) {
        $posts = $posts[$parent->id]->children;

        foreach ($posts as $post) {

            echo '<div class="indent">';
            if (empty($USER->id)) {
                $ownpost = false;
            } else {
                $ownpost = ($USER->id == $post->userid);
            }

            $post->subject = format_string($post->subject);
            $postread = !empty($post->postread);

            if (forum_print_post($post, $discussion, $forum, $cm, $course, $ownpost, $reply, $link, $ratings,
                                 '', '', $postread, true, $forumtracked)) {
                $ratingsmenuused = true;
            }
            if (forum_print_posts_nested($course, $cm, $forum, $discussion, $post, $ratings, $reply, $forumtracked, $posts)) {
                $ratingsmenuused = true;
            }
            echo "</div>\n";
        }
    }
    return $ratingsmenuused;
}

/**
 * Returns all forum posts since a given time in specified forum.
 */
function forum_get_recent_mod_activity(&$activities, &$index, $timestart, $courseid, $cmid, $userid=0, $groupid=0)  {
    global $CFG, $COURSE, $USER;

    if ($COURSE->id == $courseid) {
        $course = $COURSE;
    } else {
        $course = get_record('course', 'id', $courseid);
    }

    $modinfo =& get_fast_modinfo($course);

    $cm = $modinfo->cms[$cmid];

    if ($userid) {
        $userselect = "AND u.id = $userid";
    } else {
        $userselect = "";
    }

    if ($groupid) {
        $groupselect = "AND gm.groupid = $groupid";
        $groupjoin   = "JOIN {$CFG->prefix}groups_members gm ON  gm.userid=u.id";
    } else {
        $groupselect = "";
        $groupjoin   = "";
    }

    if (!$posts = get_records_sql("SELECT p.*, f.type AS forumtype, d.forum, d.groupid,
                                          d.timestart, d.timeend, d.userid AS duserid,
                                          u.firstname, u.lastname, u.email, u.picture, u.imagealt
                                     FROM {$CFG->prefix}forum_posts p
                                          JOIN {$CFG->prefix}forum_discussions d ON d.id = p.discussion
                                          JOIN {$CFG->prefix}forum f             ON f.id = d.forum
                                          JOIN {$CFG->prefix}user u              ON u.id = p.userid
                                          $groupjoin
                                    WHERE p.created > $timestart AND f.id = $cm->instance
                                          $userselect $groupselect
                                 ORDER BY p.id ASC")) { // order by initial posting date
         return;
    }

    $groupmode       = groups_get_activity_groupmode($cm, $course);
    $cm_context      = get_context_instance(CONTEXT_MODULE, $cm->id);
    $viewhiddentimed = has_capability('mod/forum:viewhiddentimedposts', $cm_context);
    $accessallgroups = has_capability('moodle/site:accessallgroups', $cm_context);

    if (is_null($modinfo->groups)) {
        $modinfo->groups = groups_get_user_groups($course->id); // load all my groups and cache it in modinfo
    }

    $printposts = array();
    foreach ($posts as $post) {

        if (!empty($CFG->forum_enabletimedposts) and $USER->id != $post->duserid
          and (($post->timestart > 0 and $post->timestart > time()) or ($post->timeend > 0 and $post->timeend < time()))) {
            if (!$viewhiddentimed) {
                continue;
            }
        }

        if ($groupmode) {
            if ($post->groupid == -1 or $groupmode == VISIBLEGROUPS or $accessallgroups) {
                // oki (Open discussions have groupid -1)
            } else {
                // separate mode
                if (isguestuser()) {
                    // shortcut
                    continue;
                }

                if (!array_key_exists($post->groupid, $modinfo->groups[0])) {
                    continue;
                }
            }
        }

        $printposts[] = $post;
    }

    if (!$printposts) {
        return;
    }

    $aname = format_string($cm->name,true);

    foreach ($printposts as $post) {
        $tmpactivity = new object();

        $tmpactivity->type         = 'forum';
        $tmpactivity->cmid         = $cm->id;
        $tmpactivity->name         = $aname;
        $tmpactivity->sectionnum   = $cm->sectionnum;
        $tmpactivity->timestamp    = $post->modified;

        $tmpactivity->content = new object();
        $tmpactivity->content->id         = $post->id;
        $tmpactivity->content->discussion = $post->discussion;
        $tmpactivity->content->subject    = format_string($post->subject);
        $tmpactivity->content->parent     = $post->parent;

        $tmpactivity->user = new object();
        $tmpactivity->user->id        = $post->userid;
        $tmpactivity->user->firstname = $post->firstname;
        $tmpactivity->user->lastname  = $post->lastname;
        $tmpactivity->user->picture   = $post->picture;
        $tmpactivity->user->imagealt  = $post->imagealt;
        $tmpactivity->user->email     = $post->email;

        $activities[$index++] = $tmpactivity;
    }

    return;
}

/**
 *
 */
function forum_print_recent_mod_activity($activity, $courseid, $detail, $modnames, $viewfullnames) {
    global $CFG;

    if ($activity->content->parent) {
        $class = 'reply';
    } else {
        $class = 'discussion';
    }

    echo '<table border="0" cellpadding="3" cellspacing="0" class="forum-recent">';

    echo "<tr><td class=\"userpicture\" valign=\"top\">";
    print_user_picture($activity->user, $courseid);
    echo "</td><td class=\"$class\">";

    echo '<div class="title">';
    if ($detail) {
        $aname = s($activity->name);
        echo "<img src=\"$CFG->modpixpath/$activity->type/icon.gif\" ".
             "class=\"icon\" alt=\"{$aname}\" />";
    }
    echo "<a href=\"$CFG->wwwroot/mod/forum/discuss.php?d={$activity->content->discussion}"
         ."#p{$activity->content->id}\">{$activity->content->subject}</a>";
    echo '</div>';

    echo '<div class="user">';
    $fullname = fullname($activity->user, $viewfullnames);
    echo "<a href=\"$CFG->wwwroot/user/view.php?id={$activity->user->id}&amp;course=$courseid\">"
         ."{$fullname}</a> - ".userdate($activity->timestamp);
    echo '</div>';
      echo "</td></tr></table>";

    return;
}

/**
 * recursively sets the discussion field to $discussionid on $postid and all its children
 * used when pruning a post
 */
function forum_change_discussionid($postid, $discussionid) {
    set_field('forum_posts', 'discussion', $discussionid, 'id', $postid);
    if ($posts = get_records('forum_posts', 'parent', $postid)) {
        foreach ($posts as $post) {
            forum_change_discussionid($post->id, $discussionid);
        }
    }
    return true;
}

/**
 * Prints the editing button on subscribers page
 */
function forum_update_subscriptions_button($courseid, $forumid) {
    global $CFG, $USER;

    if (!empty($USER->subscriptionsediting)) {
        $string = get_string('turneditingoff');
        $edit = "off";
    } else {
        $string = get_string('turneditingon');
        $edit = "on";
    }

    return "<form $CFG->frametarget method=\"get\" action=\"$CFG->wwwroot/mod/forum/subscribers.php\">".
           "<input type=\"hidden\" name=\"id\" value=\"$forumid\" />".
           "<input type=\"hidden\" name=\"edit\" value=\"$edit\" />".
           "<input type=\"submit\" value=\"$string\" /></form>";
}

/*
 * This function gets run whenever a role is assigned to a user in a context
 *
 * @param integer $userid
 * @param object $context
 * @return bool
 */
function forum_role_assign($userid, $context, $roleid) {
    // check to see if this role comes with mod/forum:initialsubscriptions
    $cap = role_context_capabilities($roleid, $context, 'mod/forum:initialsubscriptions');
    $cap1 = role_context_capabilities($roleid, $context, 'moodle/course:view');
    // we are checking the role because has_capability() will pull this capability out
    // from other roles this user might have and resolve them, which is no good
    // the role needs course view to
    if (isset($cap['mod/forum:initialsubscriptions']) && $cap['mod/forum:initialsubscriptions'] == CAP_ALLOW &&
        isset($cap1['moodle/course:view']) && $cap1['moodle/course:view'] == CAP_ALLOW) {
        return forum_add_user_default_subscriptions($userid, $context);
    } else {
        // MDL-8981, do not subscribe to forum
        return true;
    }
}


/**
 * This function gets run whenever a role is assigned to a user in a context
 *
 * @param integer $userid
 * @param object $context
 * @return bool
 */
function forum_role_unassign($userid, $context) {
    if (empty($context->contextlevel)) {
        return false;
    }

    forum_remove_user_subscriptions($userid, $context);
    forum_remove_user_tracking($userid, $context);

    return true;
}


/**
 * Add subscriptions for new users
 */
function forum_add_user_default_subscriptions($userid, $context) {

    if (empty($context->contextlevel)) {
        return false;
    }

    switch ($context->contextlevel) {

        case CONTEXT_SYSTEM:   // For the whole site
             $rs = get_recordset('course', '', '', '', 'id');
             while ($course = rs_fetch_next_record($rs)) {
                 $subcontext = get_context_instance(CONTEXT_COURSE, $course->id);
                 forum_add_user_default_subscriptions($userid, $subcontext);
             }
             rs_close($rs);
             break;

        case CONTEXT_COURSECAT:   // For a whole category
            $rs = get_recordset('course', 'category', $context->instanceid, '', 'id');
            while ($course = rs_fetch_next_record($rs)) {
                $subcontext = get_context_instance(CONTEXT_COURSE, $course->id);
                forum_add_user_default_subscriptions($userid, $subcontext);
            }
            rs_close($rs);
             if ($categories = get_records('course_categories', 'parent', $context->instanceid)) {
                 foreach ($categories as $category) {
                     $subcontext = get_context_instance(CONTEXT_COURSECAT, $category->id);
                     forum_add_user_default_subscriptions($userid, $subcontext);
                 }
             }
             break;


        case CONTEXT_COURSE:   // For a whole course
             if ($course = get_record('course', 'id', $context->instanceid)) {
                 if ($forums = get_all_instances_in_course('forum', $course, $userid, false)) {
                     foreach ($forums as $forum) {
                         if ($forum->forcesubscribe != FORUM_INITIALSUBSCRIBE) {
                             continue;
                         }
                         if ($modcontext = get_context_instance(CONTEXT_MODULE, $forum->coursemodule)) {
                             if (has_capability('mod/forum:viewdiscussion', $modcontext, $userid)) {
                                 forum_subscribe($userid, $forum->id);
                             }
                         }
                     }
                 }
             }
             break;

        case CONTEXT_MODULE:   // Just one forum
             if ($cm = get_coursemodule_from_id('forum', $context->instanceid)) {
                 if ($forum = get_record('forum', 'id', $cm->instance)) {
                     if ($forum->forcesubscribe != FORUM_INITIALSUBSCRIBE) {
                         continue;
                     }
                     if (has_capability('mod/forum:viewdiscussion', $context, $userid)) {
                         forum_subscribe($userid, $forum->id);
                     }
                 }
             }
             break;
    }

    return true;
}


/**
 * Remove subscriptions for a user in a context
 */
function forum_remove_user_subscriptions($userid, $context) {

    global $CFG;

    if (empty($context->contextlevel)) {
        return false;
    }

    switch ($context->contextlevel) {

        case CONTEXT_SYSTEM:   // For the whole site
            //if ($courses = get_my_courses($userid)) {
            // find all courses in which this user has a forum subscription
            if ($courses = get_records_sql("SELECT c.id
                                              FROM {$CFG->prefix}course c,
                                                   {$CFG->prefix}forum_subscriptions fs,
                                                   {$CFG->prefix}forum f
                                                   WHERE c.id = f.course AND f.id = fs.forum AND fs.userid = $userid
                                                   GROUP BY c.id")) {

                foreach ($courses as $course) {
                    $subcontext = get_context_instance(CONTEXT_COURSE, $course->id);
                    forum_remove_user_subscriptions($userid, $subcontext);
                }
            }
            break;

        case CONTEXT_COURSECAT:   // For a whole category
             if ($courses = get_records('course', 'category', $context->instanceid, '', 'id')) {
                 foreach ($courses as $course) {
                     $subcontext = get_context_instance(CONTEXT_COURSE, $course->id);
                     forum_remove_user_subscriptions($userid, $subcontext);
                 }
             }
             if ($categories = get_records('course_categories', 'parent', $context->instanceid, '', 'id')) {
                 foreach ($categories as $category) {
                     $subcontext = get_context_instance(CONTEXT_COURSECAT, $category->id);
                     forum_remove_user_subscriptions($userid, $subcontext);
                 }
             }
             break;

        case CONTEXT_COURSE:   // For a whole course
             if ($course = get_record('course', 'id', $context->instanceid, '', '', '', '', 'id')) {
                // find all forums in which this user has a subscription, and its coursemodule id
                if ($forums = get_records_sql("SELECT f.id, cm.id as coursemodule
                                                 FROM {$CFG->prefix}forum f,
                                                      {$CFG->prefix}modules m,
                                                      {$CFG->prefix}course_modules cm,
                                                      {$CFG->prefix}forum_subscriptions fs
                                                WHERE fs.userid = $userid AND f.course = $context->instanceid
                                                      AND fs.forum = f.id AND cm.instance = f.id
                                                      AND cm.module = m.id AND m.name = 'forum'")) {

                     foreach ($forums as $forum) {
                         if ($modcontext = get_context_instance(CONTEXT_MODULE, $forum->coursemodule)) {
                             if (!has_capability('mod/forum:viewdiscussion', $modcontext, $userid)) {
                                 forum_unsubscribe($userid, $forum->id);
                             }
                         }
                     }
                 }
             }
             break;

        case CONTEXT_MODULE:   // Just one forum
             if ($cm = get_coursemodule_from_id('forum', $context->instanceid)) {
                 if ($forum = get_record('forum', 'id', $cm->instance)) {
                     if (!has_capability('mod/forum:viewdiscussion', $context, $userid)) {
                         forum_unsubscribe($userid, $forum->id);
                     }
                 }
             }
             break;
    }

    return true;
}

// Functions to do with read tracking.

/**
 * Remove post tracking for a user in a context
 */
function forum_remove_user_tracking($userid, $context) {

    global $CFG;

    if (empty($context->contextlevel)) {
        return false;
    }

    switch ($context->contextlevel) {

        case CONTEXT_SYSTEM:   // For the whole site
            // find all courses in which this user has tracking info
            $allcourses = array();
            if ($courses = get_records_sql("SELECT c.id
                                              FROM {$CFG->prefix}course c,
                                                   {$CFG->prefix}forum_read fr,
                                                   {$CFG->prefix}forum f
                                                   WHERE c.id = f.course AND f.id = fr.forumid AND fr.userid = $userid
                                                   GROUP BY c.id")) {

                $allcourses = $allcourses + $courses;
            }
            if ($courses = get_records_sql("SELECT c.id
                                              FROM {$CFG->prefix}course c,
                                                   {$CFG->prefix}forum_track_prefs ft,
                                                   {$CFG->prefix}forum f
                                             WHERE c.id = f.course AND f.id = ft.forumid AND ft.userid = $userid")) {

                $allcourses = $allcourses + $courses;
            }
            foreach ($allcourses as $course) {
                $subcontext = get_context_instance(CONTEXT_COURSE, $course->id);
                forum_remove_user_tracking($userid, $subcontext);
            }
            break;

        case CONTEXT_COURSECAT:   // For a whole category
             if ($courses = get_records('course', 'category', $context->instanceid, '', 'id')) {
                 foreach ($courses as $course) {
                     $subcontext = get_context_instance(CONTEXT_COURSE, $course->id);
                     forum_remove_user_tracking($userid, $subcontext);
                 }
             }
             if ($categories = get_records('course_categories', 'parent', $context->instanceid, '', 'id')) {
                 foreach ($categories as $category) {
                     $subcontext = get_context_instance(CONTEXT_COURSECAT, $category->id);
                     forum_remove_user_tracking($userid, $subcontext);
                 }
             }
             break;

        case CONTEXT_COURSE:   // For a whole course
             if ($course = get_record('course', 'id', $context->instanceid, '', '', '', '', 'id')) {
                // find all forums in which this user has reading tracked
                if ($forums = get_records_sql("SELECT f.id, cm.id as coursemodule
                                                 FROM {$CFG->prefix}forum f,
                                                      {$CFG->prefix}modules m,
                                                      {$CFG->prefix}course_modules cm,
                                                      {$CFG->prefix}forum_read fr
                                                WHERE fr.userid = $userid AND f.course = $context->instanceid
                                                      AND fr.forumid = f.id AND cm.instance = f.id
                                                      AND cm.module = m.id AND m.name = 'forum'")) {

                     foreach ($forums as $forum) {
                         if ($modcontext = get_context_instance(CONTEXT_MODULE, $forum->coursemodule)) {
                             if (!has_capability('mod/forum:viewdiscussion', $modcontext, $userid)) {
                                forum_tp_delete_read_records($userid, -1, -1, $forum->id);
                             }
                         }
                     }
                 }

                // find all forums in which this user has a disabled tracking
                if ($forums = get_records_sql("SELECT f.id, cm.id as coursemodule
                                                 FROM {$CFG->prefix}forum f,
                                                      {$CFG->prefix}modules m,
                                                      {$CFG->prefix}course_modules cm,
                                                      {$CFG->prefix}forum_track_prefs ft
                                                WHERE ft.userid = $userid AND f.course = $context->instanceid
                                                      AND ft.forumid = f.id AND cm.instance = f.id
                                                      AND cm.module = m.id AND m.name = 'forum'")) {

                     foreach ($forums as $forum) {
                         if ($modcontext = get_context_instance(CONTEXT_MODULE, $forum->coursemodule)) {
                             if (!has_capability('mod/forum:viewdiscussion', $modcontext, $userid)) {
                                delete_records('forum_track_prefs', 'userid', $userid, 'forumid', $forum->id);
                             }
                         }
                     }
                 }
             }
             break;

        case CONTEXT_MODULE:   // Just one forum
             if ($cm = get_coursemodule_from_id('forum', $context->instanceid)) {
                 if ($forum = get_record('forum', 'id', $cm->instance)) {
                     if (!has_capability('mod/forum:viewdiscussion', $context, $userid)) {
                        delete_records('forum_track_prefs', 'userid', $userid, 'forumid', $forum->id);
                        forum_tp_delete_read_records($userid, -1, -1, $forum->id);
                     }
                 }
             }
             break;
    }

    return true;
}

/**
 * Mark posts as read.
 * @param object $user object
 * @param array $postids array of post ids
 * @return boolean success
 */
function forum_tp_mark_posts_read($user, $postids) {
    global $CFG;

    if (!forum_tp_can_track_forums(false, $user)) {
        return true;
    }

    $status = true;

    $now = time();
    $cutoffdate = $now - ($CFG->forum_oldpostdays * 24 * 3600);

    if (empty($postids)) {
        return true;

    } else if (count($postids) > 200) {
        while ($part = array_splice($postids, 0, 200)) {
            $status = forum_tp_mark_posts_read($user, $part) && $status;
        }
        return $status;
    }

    $sql = "SELECT id
              FROM {$CFG->prefix}forum_read
             WHERE userid = $user->id AND postid IN (".implode(',', $postids).")";
    if ($existing = get_records_sql($sql)) {
        $existing = array_keys($existing);
    } else {
        $existing = array();
    }

    $new = array_diff($postids, $existing);

    if ($new) {
        $sql = "INSERT INTO {$CFG->prefix}forum_read (userid, postid, discussionid, forumid, firstread, lastread)

                SELECT $user->id, p.id, p.discussion, d.forum, $now, $now
                  FROM {$CFG->prefix}forum_posts p
                       JOIN {$CFG->prefix}forum_discussions d       ON d.id = p.discussion
                       JOIN {$CFG->prefix}forum f                   ON f.id = d.forum
                       LEFT JOIN {$CFG->prefix}forum_track_prefs tf ON (tf.userid = $user->id AND tf.forumid = f.id)
                 WHERE p.id IN (".implode(',', $new).")
                       AND p.modified >= $cutoffdate
                       AND (f.trackingtype = ".FORUM_TRACKING_ON."
                            OR (f.trackingtype = ".FORUM_TRACKING_OPTIONAL." AND tf.id IS NULL))";
        $status = execute_sql($sql, false) && $status;
    }

    if ($existing) {
        $sql = "UPDATE {$CFG->prefix}forum_read
                   SET lastread = $now
                 WHERE userid = $user->id AND postid IN (".implode(',', $existing).")";
        $status = execute_sql($sql, false) && $status;
    }

    return $status;
}

/**
 * Mark post as read.
 */
function forum_tp_add_read_record($userid, $postid) {
    global $CFG;

    $now = time();
    $cutoffdate = $now - ($CFG->forum_oldpostdays * 24 * 3600);

    if (!record_exists('forum_read', 'userid', $userid, 'postid', $postid)) {
        $sql = "INSERT INTO {$CFG->prefix}forum_read (userid, postid, discussionid, forumid, firstread, lastread)

                SELECT $userid, p.id, p.discussion, d.forum, $now, $now
                  FROM {$CFG->prefix}forum_posts p
                       JOIN {$CFG->prefix}forum_discussions d ON d.id = p.discussion
                 WHERE p.id = $postid AND p.modified >= $cutoffdate";
        return execute_sql($sql, false);

    } else {
        $sql = "UPDATE {$CFG->prefix}forum_read
                   SET lastread = $now
                 WHERE userid = $userid AND postid = $userid";
        return execute_sql($sql, false);
    }
}

/**
 * Returns all records in the 'forum_read' table matching the passed keys, indexed
 * by userid.
 */
function forum_tp_get_read_records($userid=-1, $postid=-1, $discussionid=-1, $forumid=-1) {
    $select = '';
    if ($userid > -1) {
        if ($select != '') $select .= ' AND ';
        $select .= 'userid = \''.$userid.'\'';
    }
    if ($postid > -1) {
        if ($select != '') $select .= ' AND ';
        $select .= 'postid = \''.$postid.'\'';
    }
    if ($discussionid > -1) {
        if ($select != '') $select .= ' AND ';
        $select .= 'discussionid = \''.$discussionid.'\'';
    }
    if ($forumid > -1) {
        if ($select != '') $select .= ' AND ';
        $select .= 'forumid = \''.$forumid.'\'';
    }

    return get_records_select('forum_read', $select);
}

/**
 * Returns all read records for the provided user and discussion, indexed by postid.
 */
function forum_tp_get_discussion_read_records($userid, $discussionid) {
    $select = 'userid = \''.$userid.'\' AND discussionid = \''.$discussionid.'\'';
    $fields = 'postid, firstread, lastread';
    return get_records_select('forum_read', $select, '', $fields);
}

/**
 * If its an old post, do nothing. If the record exists, the maintenance will clear it up later.
 */
function forum_tp_mark_post_read($userid, $post, $forumid) {
    if (!forum_tp_is_post_old($post)) {
        return forum_tp_add_read_record($userid, $post->id);
    } else {
        return true;
    }
}

/**
 * Marks a whole forum as read, for a given user
 */
function forum_tp_mark_forum_read($user, $forumid, $groupid=false) {
    global $CFG;

    $cutoffdate = time() - ($CFG->forum_oldpostdays*24*60*60);

    $groupsel = "";
    if ($groupid !== false) {
        $groupsel = " AND (d.groupid = $groupid OR d.groupid = -1)";
    }

    $sql = "SELECT p.id
              FROM {$CFG->prefix}forum_posts p
                   LEFT JOIN {$CFG->prefix}forum_discussions d ON d.id = p.discussion
                   LEFT JOIN {$CFG->prefix}forum_read r        ON (r.postid = p.id AND r.userid = $user->id)
             WHERE d.forum = $forumid
                   AND p.modified >= $cutoffdate AND r.id is NULL
                   $groupsel";

    if ($posts = get_records_sql($sql)) {
        $postids = array_keys($posts);
        return forum_tp_mark_posts_read($user, $postids);
    }

    return true;
}

/**
 * Marks a whole discussion as read, for a given user
 */
function forum_tp_mark_discussion_read($user, $discussionid) {
    global $CFG;

    $cutoffdate = time() - ($CFG->forum_oldpostdays*24*60*60);

    $sql = "SELECT p.id
              FROM {$CFG->prefix}forum_posts p
                   LEFT JOIN {$CFG->prefix}forum_read r ON (r.postid = p.id AND r.userid = $user->id)
             WHERE p.discussion = $discussionid
                   AND p.modified >= $cutoffdate AND r.id is NULL";

    if ($posts = get_records_sql($sql)) {
        $postids = array_keys($posts);
        return forum_tp_mark_posts_read($user, $postids);
    }

    return true;
}

/**
 *
 */
function forum_tp_is_post_read($userid, $post) {
    return (forum_tp_is_post_old($post) ||
            record_exists('forum_read', 'userid', $userid, 'postid', $post->id));
}

/**
 *
 */
function forum_tp_is_post_old($post, $time=null) {
    global $CFG;

    if (is_null($time)) {
        $time = time();
    }
    return ($post->modified < ($time - ($CFG->forum_oldpostdays * 24 * 3600)));
}

/**
 * Returns the count of records for the provided user and discussion.
 */
function forum_tp_count_discussion_read_records($userid, $discussionid) {
    global $CFG;

    $cutoffdate = isset($CFG->forum_oldpostdays) ? (time() - ($CFG->forum_oldpostdays*24*60*60)) : 0;

    $sql = 'SELECT COUNT(DISTINCT p.id) '.
           'FROM '.$CFG->prefix.'forum_discussions d '.
           'LEFT JOIN '.$CFG->prefix.'forum_read r ON d.id = r.discussionid AND r.userid = '.$userid.' '.
           'LEFT JOIN '.$CFG->prefix.'forum_posts p ON p.discussion = d.id '.
                'AND (p.modified < '.$cutoffdate.' OR p.id = r.postid) '.
           'WHERE d.id = '.$discussionid;

    return (count_records_sql($sql));
}

/**
 * Returns the count of records for the provided user and discussion.
 */
function forum_tp_count_discussion_unread_posts($userid, $discussionid) {
    global $CFG;

    $cutoffdate = isset($CFG->forum_oldpostdays) ? (time() - ($CFG->forum_oldpostdays*24*60*60)) : 0;

    $sql = 'SELECT COUNT(p.id) '.
           'FROM '.$CFG->prefix.'forum_posts p '.
           'LEFT JOIN '.$CFG->prefix.'forum_read r ON r.postid = p.id AND r.userid = '.$userid.' '.
           'WHERE p.discussion = '.$discussionid.' '.
                'AND p.modified >= '.$cutoffdate.' AND r.id is NULL';

    return (count_records_sql($sql));
}

/**
 * Returns the count of posts for the provided forum and [optionally] group.
 */
function forum_tp_count_forum_posts($forumid, $groupid=false) {
    global $CFG;

    $sql = 'SELECT COUNT(*) '.
           'FROM '.$CFG->prefix.'forum_posts fp,'.$CFG->prefix.'forum_discussions fd '.
           'WHERE fd.forum = '.$forumid.' AND fp.discussion = fd.id';
    if ($groupid !== false) {
        $sql .= ' AND (fd.groupid = '.$groupid.' OR fd.groupid = -1)';
    }
    $count = count_records_sql($sql);


    return $count;
}

/**
 * Returns the count of records for the provided user and forum and [optionally] group.
 */
function forum_tp_count_forum_read_records($userid, $forumid, $groupid=false) {
    global $CFG;

    $cutoffdate = time() - ($CFG->forum_oldpostdays*24*60*60);

    $groupsel = '';
    if ($groupid !== false) {
        $groupsel = "AND (d.groupid = $groupid OR d.groupid = -1)";
    }

    $sql = "SELECT COUNT(p.id)
              FROM  {$CFG->prefix}forum_posts p
                    JOIN {$CFG->prefix}forum_discussions d ON d.id = p.discussion
                    LEFT JOIN {$CFG->prefix}forum_read r   ON (r.postid = p.id AND r.userid= $userid)
              WHERE d.forum = $forumid
                    AND (p.modified < $cutoffdate OR (p.modified >= $cutoffdate AND r.id IS NOT NULL))
                    $groupsel";

    return get_field_sql($sql);
}

/**
 * Returns the count of records for the provided user and course.
 * Please note that group access is ignored!
 */
function forum_tp_get_course_unread_posts($userid, $courseid) {
    global $CFG;

    $now = round(time(), -2); // db cache friendliness
    $cutoffdate = $now - ($CFG->forum_oldpostdays*24*60*60);

    if (!empty($CFG->forum_enabletimedposts)) {
        $timedsql = "AND d.timestart < $now AND (d.timeend = 0 OR d.timeend > $now)";
    } else {
        $timedsql = "";
    }

    $sql = "SELECT f.id, COUNT(p.id) AS unread
              FROM {$CFG->prefix}forum_posts p
                   JOIN {$CFG->prefix}forum_discussions d       ON d.id = p.discussion
                   JOIN {$CFG->prefix}forum f                   ON f.id = d.forum
                   JOIN {$CFG->prefix}course c                  ON c.id = f.course
                   LEFT JOIN {$CFG->prefix}forum_read r         ON (r.postid = p.id AND r.userid = $userid)
                   LEFT JOIN {$CFG->prefix}forum_track_prefs tf ON (tf.userid = $userid AND tf.forumid = f.id)
             WHERE f.course = $courseid
                   AND p.modified >= $cutoffdate AND r.id is NULL
                   AND (f.trackingtype = ".FORUM_TRACKING_ON."
                        OR (f.trackingtype = ".FORUM_TRACKING_OPTIONAL." AND tf.id IS NULL))
                   $timedsql
          GROUP BY f.id";

    if ($return = get_records_sql($sql)) {
        return $return;
    }

    return array();
}

/**
 * Returns the count of records for the provided user and forum and [optionally] group.
 */
function forum_tp_count_forum_unread_posts($cm, $course) {
    global $CFG, $USER;

    static $readcache = array();

    $forumid = $cm->instance;

    if (!isset($readcache[$course->id])) {
        $readcache[$course->id] = array();
        if ($counts = forum_tp_get_course_unread_posts($USER->id, $course->id)) {
            foreach ($counts as $count) {
                $readcache[$course->id][$count->id] = $count->unread;
            }
        }
    }

    if (empty($readcache[$course->id][$forumid])) {
        // no need to check group mode ;-)
        return 0;
    }

    $groupmode = groups_get_activity_groupmode($cm, $course);

    if ($groupmode != SEPARATEGROUPS) {
        return $readcache[$course->id][$forumid];
    }

    if (has_capability('moodle/site:accessallgroups', get_context_instance(CONTEXT_MODULE, $cm->id))) {
        return $readcache[$course->id][$forumid];
    }

    require_once($CFG->dirroot.'/course/lib.php');

    $modinfo =& get_fast_modinfo($course);
    if (is_null($modinfo->groups)) {
        $modinfo->groups = groups_get_user_groups($course->id, $USER->id);
    }

    if (empty($CFG->enablegroupings)) {
        $mygroups = $modinfo->groups[0];
    } else {
        if (array_key_exists($cm->groupingid, $modinfo->groups)) {
            $mygroups = $modinfo->groups[$cm->groupingid];
        } else {
            $mygroups = false; // Will be set below
        }
    }

    // add all groups posts
    if (empty($mygroups)) {
        $mygroups = array(-1=>-1);
    } else {
        $mygroups[-1] = -1;
    }
    $mygroups = implode(',', $mygroups);


    $now = round(time(), -2); // db cache friendliness
    $cutoffdate = $now - ($CFG->forum_oldpostdays*24*60*60);

    if (!empty($CFG->forum_enabletimedposts)) {
        $timedsql = "AND d.timestart < $now AND (d.timeend = 0 OR d.timeend > $now)";
    } else {
        $timedsql = "";
    }

    $sql = "SELECT COUNT(p.id)
              FROM {$CFG->prefix}forum_posts p
                   JOIN {$CFG->prefix}forum_discussions d ON p.discussion = d.id
                   LEFT JOIN {$CFG->prefix}forum_read r   ON (r.postid = p.id AND r.userid = $USER->id)
             WHERE d.forum = $forumid
                   AND p.modified >= $cutoffdate AND r.id is NULL
                   $timedsql
                   AND d.groupid IN ($mygroups)";

    return get_field_sql($sql);
}

/**
 * Deletes read records for the specified index. At least one parameter must be specified.
 */
function forum_tp_delete_read_records($userid=-1, $postid=-1, $discussionid=-1, $forumid=-1) {
    $select = '';
    if ($userid > -1) {
        if ($select != '') $select .= ' AND ';
        $select .= 'userid = \''.$userid.'\'';
    }
    if ($postid > -1) {
        if ($select != '') $select .= ' AND ';
        $select .= 'postid = \''.$postid.'\'';
    }
    if ($discussionid > -1) {
        if ($select != '') $select .= ' AND ';
        $select .= 'discussionid = \''.$discussionid.'\'';
    }
    if ($forumid > -1) {
        if ($select != '') $select .= ' AND ';
        $select .= 'forumid = \''.$forumid.'\'';
    }
    if ($select == '') {
        return false;
    }
    else {
        return delete_records_select('forum_read', $select);
    }
}
/**
 * Get a list of forums not tracked by the user.
 *
 * @param int $userid The id of the user to use.
 * @param int $courseid The id of the course being checked.
 * @return mixed An array indexed by forum id, or false.
 */
function forum_tp_get_untracked_forums($userid, $courseid) {
    global $CFG;

    $sql = "SELECT f.id
              FROM {$CFG->prefix}forum f
                   LEFT JOIN {$CFG->prefix}forum_track_prefs ft ON (ft.forumid = f.id AND ft.userid = $userid)
             WHERE f.course = $courseid
                   AND (f.trackingtype = ".FORUM_TRACKING_OFF."
                        OR (f.trackingtype = ".FORUM_TRACKING_OPTIONAL." AND ft.id IS NOT NULL))";

    if ($forums = get_records_sql($sql)) {
        foreach ($forums as $forum) {
            $forums[$forum->id] = $forum;
        }
        return $forums;

    } else {
        return array();
    }
}

/**
 * Determine if a user can track forums and optionally a particular forum.
 * Checks the site settings, the user settings and the forum settings (if
 * requested).
 *
 * @param mixed $forum The forum object to test, or the int id (optional).
 * @param mixed $userid The user object to check for (optional).
 * @return boolean
 */
function forum_tp_can_track_forums($forum=false, $user=false) {
    global $USER, $CFG;

    // if possible, avoid expensive
    // queries
    if (empty($CFG->forum_trackreadposts)) {
        return false;
    }

    if ($user === false) {
        $user = $USER;
    }

    if (isguestuser($user) or empty($user->id)) {
        return false;
    }

    if ($forum === false) {
        // general abitily to track forums
        return (bool)$user->trackforums;
    }


    // Work toward always passing an object...
    if (is_numeric($forum)) {
        debugging('Better use proper forum object.', DEBUG_DEVELOPER);
        $forum = get_record('forum', 'id', $forum, '','','','', 'id,trackingtype');
    }

    $forumallows = ($forum->trackingtype == FORUM_TRACKING_OPTIONAL);
    $forumforced = ($forum->trackingtype == FORUM_TRACKING_ON);

    return ($forumforced || $forumallows)  && !empty($user->trackforums);
}

/**
 * Tells whether a specific forum is tracked by the user. A user can optionally
 * be specified. If not specified, the current user is assumed.
 *
 * @param mixed $forum If int, the id of the forum being checked; if object, the forum object
 * @param int $userid The id of the user being checked (optional).
 * @return boolean
 */
function forum_tp_is_tracked($forum, $user=false) {
    global $USER, $CFG;

    if ($user === false) {
        $user = $USER;
    }

    if (isguestuser($user) or empty($user->id)) {
        return false;
    }

    // Work toward always passing an object...
    if (is_numeric($forum)) {
        debugging('Better use proper forum object.', DEBUG_DEVELOPER);
        $forum = get_record('forum', 'id', $forum);
    }

    if (!forum_tp_can_track_forums($forum, $user)) {
        return false;
    }

    $forumallows = ($forum->trackingtype == FORUM_TRACKING_OPTIONAL);
    $forumforced = ($forum->trackingtype == FORUM_TRACKING_ON);

    return $forumforced ||
           ($forumallows && get_record('forum_track_prefs', 'userid', $user->id, 'forumid', $forum->id) === false);
}

/**
 *
 */
function forum_tp_start_tracking($forumid, $userid=false) {
    global $USER;

    if ($userid === false) {
        $userid = $USER->id;
    }

    return delete_records('forum_track_prefs', 'userid', $userid, 'forumid', $forumid);
}

/**
 *
 */
function forum_tp_stop_tracking($forumid, $userid=false) {
    global $USER;

    if ($userid === false) {
        $userid = $USER->id;
    }

    if (!record_exists('forum_track_prefs', 'userid', $userid, 'forumid', $forumid)) {
        $track_prefs = new object();
        $track_prefs->userid = $userid;
        $track_prefs->forumid = $forumid;
        insert_record('forum_track_prefs', $track_prefs);
    }

    return forum_tp_delete_read_records($userid, -1, -1, $forumid);
}


/**
 * Clean old records from the forum_read table.
 */
function forum_tp_clean_read_records() {
    global $CFG;

    if (!isset($CFG->forum_oldpostdays)) {
        return;
    }
// Look for records older than the cutoffdate that are still in the forum_read table.
    $cutoffdate = time() - ($CFG->forum_oldpostdays*24*60*60);

    //first get the oldest tracking present - we need tis to speedup the next delete query
    $sql = "SELECT MIN(fp.modified) AS first
              FROM {$CFG->prefix}forum_posts fp
                   JOIN {$CFG->prefix}forum_read fr ON fr.postid=fp.id";
    if (!$first = get_field_sql($sql)) {
        // nothing to delete;
        return;
    }

    // now delete old tracking info
    $sql = "DELETE
              FROM {$CFG->prefix}forum_read
             WHERE postid IN (SELECT fp.id
                                FROM {$CFG->prefix}forum_posts fp
                               WHERE fp.modified >= $first AND fp.modified < $cutoffdate)";
    execute_sql($sql, false);
}

/**
 * Sets the last post for a given discussion
 **/
function forum_discussion_update_last_post($discussionid) {
    global $CFG, $db;

// Check the given discussion exists
    if (!record_exists('forum_discussions', 'id', $discussionid)) {
        return false;
    }

// Use SQL to find the last post for this discussion
    $sql = 'SELECT id, userid, modified '.
           'FROM '.$CFG->prefix.'forum_posts '.
           'WHERE discussion='.$discussionid.' '.
           'ORDER BY modified DESC ';

// Lets go find the last post
    if (($lastpost = get_record_sql($sql, true))) {
        $discussionobject = new Object;
        $discussionobject->id = $discussionid;
        $discussionobject->usermodified = $lastpost->userid;
        $discussionobject->timemodified = $lastpost->modified;
        if (update_record('forum_discussions', $discussionobject)) {
            return $lastpost->id;
        }
    }

// To get here either we couldn't find a post for the discussion (weird)
// or we couldn't update the discussion record (weird x2)
    return false;
}


/**
 *
 */
function forum_get_view_actions() {
    return array('view discussion','search','forum','forums','subscribers');
}

/**
 *
 */
function forum_get_post_actions() {
    return array('add discussion','add post','delete discussion','delete post','move discussion','prune post','update post');
}

/**
 * this function returns all the separate forum ids, given a courseid
 * @param int $courseid
 * @return array
 */
function forum_get_separate_modules($courseid) {

    global $CFG,$db;
    $forummodule = get_record("modules", "name", "forum");

    $sql = 'SELECT f.id, f.id FROM '.$CFG->prefix.'forum f, '.$CFG->prefix.'course_modules cm WHERE
           f.id = cm.instance AND cm.module ='.$forummodule->id.' AND cm.visible = 1 AND cm.course = '.$courseid.'
           AND cm.groupmode ='.SEPARATEGROUPS;

    return get_records_sql($sql);

}

/**
 *
 */
function forum_check_throttling($forum, $cm=null) {
    global $USER, $CFG;

    if (is_numeric($forum)) {
        $forum = get_record('forum','id',$forum);
    }
    if (!is_object($forum)) {
        return false;  // this is broken.
    }

    if (empty($forum->blockafter)) {
        return true;
    }

    if (empty($forum->blockperiod)) {
        return true;
    }

    if (!$cm) {
        if (!$cm = get_coursemodule_from_instance('forum', $forum->id, $forum->course)) {
            error('Course Module ID was incorrect');
        }
    }

    $modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);
    if(!has_capability('mod/forum:throttlingapplies', $modcontext)) {
        return true;
    }

    // get the number of posts in the last period we care about
    $timenow = time();
    $timeafter = $timenow - $forum->blockperiod;

    $numposts = count_records_sql('SELECT COUNT(p.id) FROM '.$CFG->prefix.'forum_posts p'
                                  .' JOIN '.$CFG->prefix.'forum_discussions d'
                                  .' ON p.discussion = d.id WHERE d.forum = '.$forum->id
                                  .' AND p.userid = '.$USER->id.' AND p.created > '.$timeafter);

    $a = new object();
    $a->blockafter = $forum->blockafter;
    $a->numposts = $numposts;
    $a->blockperiod = get_string('secondstotime'.$forum->blockperiod);

    if ($forum->blockafter <= $numposts) {
        print_error('forumblockingtoomanyposts', 'error', $CFG->wwwroot.'/mod/forum/view.php?f='.$forum->id, $a);
    }
    if ($forum->warnafter <= $numposts) {
        notify(get_string('forumblockingalmosttoomanyposts','forum',$a));
    }


}


/**
 * Removes all grades from gradebook
 * @param int $courseid
 * @param string optional type
 */
function forum_reset_gradebook($courseid, $type='') {
    global $CFG;

    $type = $type ? "AND f.type='$type'" : '';

    $sql = "SELECT f.*, cm.idnumber as cmidnumber, f.course as courseid
              FROM {$CFG->prefix}forum f, {$CFG->prefix}course_modules cm, {$CFG->prefix}modules m
             WHERE m.name='forum' AND m.id=cm.module AND cm.instance=f.id AND f.course=$courseid $type";

    if ($forums = get_records_sql($sql)) {
        foreach ($forums as $forum) {
            forum_grade_item_update($forum, 'reset');
        }
    }
}

/**
 * This function is used by the reset_course_userdata function in moodlelib.
 * This function will remove all posts from the specified forum
 * and clean up any related data.
 * @param $data the data submitted from the reset course.
 * @return array status array
 */
function forum_reset_userdata($data) {
    global $CFG;
    require_once($CFG->libdir.'/filelib.php');

    $componentstr = get_string('modulenameplural', 'forum');
    $status = array();

    $removeposts = false;
    if (!empty($data->reset_forum_all)) {
        $removeposts = true;
        $typesql     = "";
        $typesstr    = get_string('resetforumsall', 'forum');
        $types       = array();

    } else if (!empty($data->reset_forum_types)){
        $removeposts = true;
        $typesql     = "";
        $types       = array();
        $forum_types_all = forum_get_forum_types_all();
        foreach ($data->reset_forum_types as $type) {
            if (!array_key_exists($type, $forum_types_all)) {
                continue;
            }
            $typesql .= " AND f.type='$type'";
            $types[] = $forum_types_all[$type];
        }
        $typesstr = get_string('resetforums', 'forum').': '.implode(', ', $types);

    }

    $alldiscussionssql = "SELECT fd.id
                            FROM {$CFG->prefix}forum_discussions fd, {$CFG->prefix}forum f
                           WHERE f.course={$data->courseid} AND f.id=fd.forum";

    $allforumssql      = "SELECT f.id
                            FROM {$CFG->prefix}forum f
                           WHERE f.course={$data->courseid}";

    $allpostssql       = "SELECT fp.id
                            FROM {$CFG->prefix}forum_posts fp, {$CFG->prefix}forum_discussions fd, {$CFG->prefix}forum f
                           WHERE f.course={$data->courseid} AND f.id=fd.forum AND fd.id=fp.discussion";

    if ($removeposts) {
        $discussionssql = "$alldiscussionssql $typesql";
        $forumssql      = "$allforumssql $typesql";
        $postssql       = "$allpostssql $typesql";

        // first delete all read flags
        delete_records_select('forum_read', "forumid IN ($forumssql)");

        // remove tracking prefs
        delete_records_select('forum_track_prefs', "forumid IN ($forumssql)");

        // remove posts from queue
        delete_records_select('forum_queue', "discussionid IN ($discussionssql)");

        // remove ratings
        delete_records_select('forum_ratings', "post IN ($postssql)");

        // all posts - initial posts must be kept in single simple discussion forums
        delete_records_select('forum_posts', "discussion IN ($discussionssql) AND parent <> 0"); // first all children
        delete_records_select('forum_posts', "discussion IN ($discussionssql AND f.type <> 'single') AND parent = 0"); // now the initial posts for non single simple

        // finally all discussions except single simple forums
        delete_records_select('forum_discussions', "forum IN ($forumssql AND f.type <> 'single')");

        // now get rid of all attachments
        if ($forums = get_records_sql($forumssql)) {
            foreach ($forums as $forumid=>$unused) {
                fulldelete($CFG->dataroot.'/'.$data->courseid.'/moddata/forum/'.$forumid);
            }
        }

        // remove all grades from gradebook
        if (empty($data->reset_gradebook_grades)) {
            if (empty($types)) {
                forum_reset_gradebook($data->courseid);
            } else {
                foreach ($types as $type) {
                    forum_reset_gradebook($data->courseid, $type);
                }
            }
        }

        $status[] = array('component'=>$componentstr, 'item'=>$typesstr, 'error'=>false);
    }

    // remove all ratings
    if (!empty($data->reset_forum_ratings)) {
        delete_records_select('forum_ratings', "post IN ($allpostssql)");
        // remove all grades from gradebook
        if (empty($data->reset_gradebook_grades)) {
            forum_reset_gradebook($data->courseid);
        }
    }

    // remove all subscriptions unconditionally - even for users still enrolled in course
    if (!empty($data->reset_forum_subscriptions)) {
        delete_records_select('forum_subscriptions', "forum IN ($allforumssql)");
        $status[] = array('component'=>$componentstr, 'item'=>get_string('resetsubscriptions','forum'), 'error'=>false);
    }

    // remove all tracking prefs unconditionally - even for users still enrolled in course
    if (!empty($data->reset_forum_track_prefs)) {
        delete_records_select('forum_track_prefs', "forumid IN ($allforumssql)");
        $status[] = array('component'=>$componentstr, 'item'=>get_string('resettrackprefs','forum'), 'error'=>false);
    }

    /// updating dates - shift may be negative too
    if ($data->timeshift) {
        shift_course_mod_dates('forum', array('assesstimestart', 'assesstimefinish'), $data->timeshift, $data->courseid);
        $status[] = array('component'=>$componentstr, 'item'=>get_string('datechanged'), 'error'=>false);
    }

    return $status;
}

/**
 * Called by course/reset.php
 * @param $mform form passed by reference
 */
function forum_reset_course_form_definition(&$mform) {
    $mform->addElement('header', 'forumheader', get_string('modulenameplural', 'forum'));

    $mform->addElement('checkbox', 'reset_forum_all', get_string('resetforumsall','forum'));

    $mform->addElement('select', 'reset_forum_types', get_string('resetforums', 'forum'), forum_get_forum_types_all(), array('multiple' => 'multiple'));
    $mform->setAdvanced('reset_forum_types');
    $mform->disabledIf('reset_forum_types', 'reset_forum_all', 'checked');

    $mform->addElement('checkbox', 'reset_forum_subscriptions', get_string('resetsubscriptions','forum'));
    $mform->setAdvanced('reset_forum_subscriptions');

    $mform->addElement('checkbox', 'reset_forum_track_prefs', get_string('resettrackprefs','forum'));
    $mform->setAdvanced('reset_forum_track_prefs');
    $mform->disabledIf('reset_forum_track_prefs', 'reset_forum_all', 'checked');

    $mform->addElement('checkbox', 'reset_forum_ratings', get_string('deleteallratings'));
    $mform->disabledIf('reset_forum_ratings', 'reset_forum_all', 'checked');
}

/**
 * Course reset form defaults.
 */
function forum_reset_course_form_defaults($course) {
    return array('reset_forum_all'=>1, 'reset_forum_subscriptions'=>0, 'reset_forum_track_prefs'=>0, 'reset_forum_ratings'=>1);
}

/**
 * Converts a forum to use the Roles System
 * @param $forum        - a forum object with the same attributes as a record
 *                        from the forum database table
 * @param $forummodid   - the id of the forum module, from the modules table
 * @param $teacherroles - array of roles that have moodle/legacy:teacher
 * @param $studentroles - array of roles that have moodle/legacy:student
 * @param $guestroles   - array of roles that have moodle/legacy:guest
 * @param $cmid         - the course_module id for this forum instance
 * @return boolean      - forum was converted or not
 */
function forum_convert_to_roles($forum, $forummodid, $teacherroles=array(),
                                $studentroles=array(), $guestroles=array(), $cmid=NULL) {

    global $CFG;

    if (!isset($forum->open) && !isset($forum->assesspublic)) {
        // We assume that this forum has already been converted to use the
        // Roles System. Columns forum.open and forum.assesspublic get dropped
        // once the forum module has been upgraded to use Roles.
        return false;
    }

    if ($forum->type == 'teacher') {

        // Teacher forums should be converted to normal forums that
        // use the Roles System to implement the old behavior.
        // Note:
        //   Seems that teacher forums were never backed up in 1.6 since they
        //   didn't have an entry in the course_modules table.
        require_once($CFG->dirroot.'/course/lib.php');

        if (count_records('forum_discussions', 'forum', $forum->id) == 0) {
            // Delete empty teacher forums.
            delete_records('forum', 'id', $forum->id);
        } else {
            // Create a course module for the forum and assign it to
            // section 0 in the course.
            $mod = new object;
            $mod->course = $forum->course;
            $mod->module = $forummodid;
            $mod->instance = $forum->id;
            $mod->section = 0;
            $mod->visible = 0;     // Hide the forum
            $mod->visibleold = 0;  // Hide the forum
            $mod->groupmode = 0;

            if (!$cmid = add_course_module($mod)) {
                error('Could not create new course module instance for the teacher forum');
            } else {
                $mod->coursemodule = $cmid;
                if (!$sectionid = add_mod_to_section($mod)) {
                    error('Could not add converted teacher forum instance to section 0 in the course');
                } else {
                    if (!set_field('course_modules', 'section', $sectionid, 'id', $cmid)) {
                        error('Could not update course module with section id');
                    }
                }
            }

            // Change the forum type to general.
            $forum->type = 'general';
            if (!update_record('forum', $forum)) {
                error('Could not change forum from type teacher to type general');
            }

            $context = get_context_instance(CONTEXT_MODULE, $cmid);

            // Create overrides for default student and guest roles (prevent).
            foreach ($studentroles as $studentrole) {
                assign_capability('mod/forum:viewdiscussion', CAP_PREVENT, $studentrole->id, $context->id);
                assign_capability('mod/forum:viewhiddentimedposts', CAP_PREVENT, $studentrole->id, $context->id);
                assign_capability('mod/forum:startdiscussion', CAP_PREVENT, $studentrole->id, $context->id);
                assign_capability('mod/forum:replypost', CAP_PREVENT, $studentrole->id, $context->id);
                assign_capability('mod/forum:viewrating', CAP_PREVENT, $studentrole->id, $context->id);
                assign_capability('mod/forum:viewanyrating', CAP_PREVENT, $studentrole->id, $context->id);
                assign_capability('mod/forum:rate', CAP_PREVENT, $studentrole->id, $context->id);
                assign_capability('mod/forum:createattachment', CAP_PREVENT, $studentrole->id, $context->id);
                assign_capability('mod/forum:deleteownpost', CAP_PREVENT, $studentrole->id, $context->id);
                assign_capability('mod/forum:deleteanypost', CAP_PREVENT, $studentrole->id, $context->id);
                assign_capability('mod/forum:splitdiscussions', CAP_PREVENT, $studentrole->id, $context->id);
                assign_capability('mod/forum:movediscussions', CAP_PREVENT, $studentrole->id, $context->id);
                assign_capability('mod/forum:editanypost', CAP_PREVENT, $studentrole->id, $context->id);
                assign_capability('mod/forum:viewqandawithoutposting', CAP_PREVENT, $studentrole->id, $context->id);
                assign_capability('mod/forum:viewsubscribers', CAP_PREVENT, $studentrole->id, $context->id);
                assign_capability('mod/forum:managesubscriptions', CAP_PREVENT, $studentrole->id, $context->id);
                assign_capability('mod/forum:throttlingapplies', CAP_PREVENT, $studentrole->id, $context->id);
            }
            foreach ($guestroles as $guestrole) {
                assign_capability('mod/forum:viewdiscussion', CAP_PREVENT, $guestrole->id, $context->id);
                assign_capability('mod/forum:viewhiddentimedposts', CAP_PREVENT, $guestrole->id, $context->id);
                assign_capability('mod/forum:startdiscussion', CAP_PREVENT, $guestrole->id, $context->id);
                assign_capability('mod/forum:replypost', CAP_PREVENT, $guestrole->id, $context->id);
                assign_capability('mod/forum:viewrating', CAP_PREVENT, $guestrole->id, $context->id);
                assign_capability('mod/forum:viewanyrating', CAP_PREVENT, $guestrole->id, $context->id);
                assign_capability('mod/forum:rate', CAP_PREVENT, $guestrole->id, $context->id);
                assign_capability('mod/forum:createattachment', CAP_PREVENT, $guestrole->id, $context->id);
                assign_capability('mod/forum:deleteownpost', CAP_PREVENT, $guestrole->id, $context->id);
                assign_capability('mod/forum:deleteanypost', CAP_PREVENT, $guestrole->id, $context->id);
                assign_capability('mod/forum:splitdiscussions', CAP_PREVENT, $guestrole->id, $context->id);
                assign_capability('mod/forum:movediscussions', CAP_PREVENT, $guestrole->id, $context->id);
                assign_capability('mod/forum:editanypost', CAP_PREVENT, $guestrole->id, $context->id);
                assign_capability('mod/forum:viewqandawithoutposting', CAP_PREVENT, $guestrole->id, $context->id);
                assign_capability('mod/forum:viewsubscribers', CAP_PREVENT, $guestrole->id, $context->id);
                assign_capability('mod/forum:managesubscriptions', CAP_PREVENT, $guestrole->id, $context->id);
                assign_capability('mod/forum:throttlingapplies', CAP_PREVENT, $guestrole->id, $context->id);
            }
        }
    } else {
        // Non-teacher forum.

        if (empty($cmid)) {
            // We were not given the course_module id. Try to find it.
            if (!$cm = get_coursemodule_from_instance('forum', $forum->id)) {
                notify('Could not get the course module for the forum');
                return false;
            } else {
                $cmid = $cm->id;
            }
        }
        $context = get_context_instance(CONTEXT_MODULE, $cmid);

        // $forum->open defines what students can do:
        //   0 = No discussions, no replies
        //   1 = No discussions, but replies are allowed
        //   2 = Discussions and replies are allowed
        switch ($forum->open) {
            case 0:
                foreach ($studentroles as $studentrole) {
                    assign_capability('mod/forum:startdiscussion', CAP_PREVENT, $studentrole->id, $context->id);
                    assign_capability('mod/forum:replypost', CAP_PREVENT, $studentrole->id, $context->id);
                }
                break;
            case 1:
                foreach ($studentroles as $studentrole) {
                    assign_capability('mod/forum:startdiscussion', CAP_PREVENT, $studentrole->id, $context->id);
                    assign_capability('mod/forum:replypost', CAP_ALLOW, $studentrole->id, $context->id);
                }
                break;
            case 2:
                foreach ($studentroles as $studentrole) {
                    assign_capability('mod/forum:startdiscussion', CAP_ALLOW, $studentrole->id, $context->id);
                    assign_capability('mod/forum:replypost', CAP_ALLOW, $studentrole->id, $context->id);
                }
                break;
        }

        // $forum->assessed defines whether forum rating is turned
        // on (1 or 2) and who can rate posts:
        //   1 = Everyone can rate posts
        //   2 = Only teachers can rate posts
        switch ($forum->assessed) {
            case 1:
                foreach ($studentroles as $studentrole) {
                    assign_capability('mod/forum:rate', CAP_ALLOW, $studentrole->id, $context->id);
                }
                foreach ($teacherroles as $teacherrole) {
                    assign_capability('mod/forum:rate', CAP_ALLOW, $teacherrole->id, $context->id);
                }
                break;
            case 2:
                foreach ($studentroles as $studentrole) {
                    assign_capability('mod/forum:rate', CAP_PREVENT, $studentrole->id, $context->id);
                }
                foreach ($teacherroles as $teacherrole) {
                    assign_capability('mod/forum:rate', CAP_ALLOW, $teacherrole->id, $context->id);
                }
                break;
        }

        // $forum->assesspublic defines whether students can see
        // everybody's ratings:
        //   0 = Students can only see their own ratings
        //   1 = Students can see everyone's ratings
        switch ($forum->assesspublic) {
            case 0:
                foreach ($studentroles as $studentrole) {
                    assign_capability('mod/forum:viewanyrating', CAP_PREVENT, $studentrole->id, $context->id);
                }
                foreach ($teacherroles as $teacherrole) {
                    assign_capability('mod/forum:viewanyrating', CAP_ALLOW, $teacherrole->id, $context->id);
                }
                break;
            case 1:
                foreach ($studentroles as $studentrole) {
                    assign_capability('mod/forum:viewanyrating', CAP_ALLOW, $studentrole->id, $context->id);
                }
                foreach ($teacherroles as $teacherrole) {
                    assign_capability('mod/forum:viewanyrating', CAP_ALLOW, $teacherrole->id, $context->id);
                }
                break;
        }

        if (empty($cm)) {
            $cm = get_record('course_modules', 'id', $cmid);
        }

        // $cm->groupmode:
        // 0 - No groups
        // 1 - Separate groups
        // 2 - Visible groups
        switch ($cm->groupmode) {
            case 0:
                break;
            case 1:
                foreach ($studentroles as $studentrole) {
                    assign_capability('moodle/site:accessallgroups', CAP_PREVENT, $studentrole->id, $context->id);
                }
                foreach ($teacherroles as $teacherrole) {
                    assign_capability('moodle/site:accessallgroups', CAP_ALLOW, $teacherrole->id, $context->id);
                }
                break;
            case 2:
                foreach ($studentroles as $studentrole) {
                    assign_capability('moodle/site:accessallgroups', CAP_ALLOW, $studentrole->id, $context->id);
                }
                foreach ($teacherroles as $teacherrole) {
                    assign_capability('moodle/site:accessallgroups', CAP_ALLOW, $teacherrole->id, $context->id);
                }
                break;
        }
    }
    return true;
}

/**
 * Returns array of forum aggregate types
 */
function forum_get_aggregate_types() {
    return array (FORUM_AGGREGATE_NONE  => get_string('aggregatenone', 'forum'),
                  FORUM_AGGREGATE_AVG   => get_string('aggregateavg', 'forum'),
                  FORUM_AGGREGATE_COUNT => get_string('aggregatecount', 'forum'),
                  FORUM_AGGREGATE_MAX   => get_string('aggregatemax', 'forum'),
                  FORUM_AGGREGATE_MIN   => get_string('aggregatemin', 'forum'),
                  FORUM_AGGREGATE_SUM   => get_string('aggregatesum', 'forum'));
}

/**
 * Returns array of forum layout modes
 */
function forum_get_layout_modes() {
    return array (FORUM_MODE_FLATOLDEST => get_string('modeflatoldestfirst', 'forum'),
                  FORUM_MODE_FLATNEWEST => get_string('modeflatnewestfirst', 'forum'),
                  FORUM_MODE_THREADED   => get_string('modethreaded', 'forum'),
                  FORUM_MODE_NESTED     => get_string('modenested', 'forum'));
}

/**
 * Returns array of forum types
 */
function forum_get_forum_types() {
    return array ('general'  => get_string('generalforum', 'forum'),
                  'eachuser' => get_string('eachuserforum', 'forum'),
                  'single'   => get_string('singleforum', 'forum'),
                  'qanda'    => get_string('qandaforum', 'forum'));
}

/**
 * Returns array of all forum layout modes
 */
function forum_get_forum_types_all() {
    return array ('news'     => get_string('namenews','forum'),
                  'social'   => get_string('namesocial','forum'),
                  'general'  => get_string('generalforum', 'forum'),
                  'eachuser' => get_string('eachuserforum', 'forum'),
                  'single'   => get_string('singleforum', 'forum'),
                  'qanda'    => get_string('qandaforum', 'forum'));
}

/**
 * Returns array of forum open modes
 */
function forum_get_open_modes() {
    return array ('2' => get_string('openmode2', 'forum'),
                  '1' => get_string('openmode1', 'forum'),
                  '0' => get_string('openmode0', 'forum') );
}

/**
 * Returns all other caps used in module
 */
function forum_get_extra_capabilities() {
    return array('moodle/site:accessallgroups', 'moodle/site:viewfullnames', 'moodle/site:trustcontent');
}

/**
 * Returns creation time of the first user's post in given discussion
 * @global object $DB
 * @param int $did Discussion id
 * @param int $userid User id
 * @return int|bool post creation time stamp or return false
 */
function forum_get_user_posted_time($did, $userid) {
    global $CFG;

    $posttime = get_field('forum_posts', 'MIN(created)', 'userid', $userid, 'discussion', $did);
    if (empty($posttime)) {
        return false;
    }
    return $posttime;
}

?>
