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#include "qstandardpaths.h"

#include <qdir.h>
#include <private/qsystemlibrary_p.h>
#include <qstringlist.h>

#ifndef QT_BOOTSTRAPPED
#include <qcoreapplication.h>
#endif

#include <qt_windows.h>
#include <shlobj.h>
#include <intshcut.h>

#ifndef QT_NO_STANDARDPATHS

QT_BEGIN_NAMESPACE

static QString convertCharArray(const wchar_t *path)
{
    return QDir::fromNativeSeparators(QString::fromWCharArray(path));
}

static inline bool isGenericConfigLocation(QStandardPaths::StandardLocation type)
{
    return type == QStandardPaths::GenericConfigLocation || type == QStandardPaths::GenericDataLocation;
}

static inline bool isConfigLocation(QStandardPaths::StandardLocation type)
{
    return type == QStandardPaths::ConfigLocation || type == QStandardPaths::AppConfigLocation
        || type == QStandardPaths::AppDataLocation || type == QStandardPaths::AppLocalDataLocation
        || isGenericConfigLocation(type);
}

static void appendOrganizationAndApp(QString &path) // Courtesy qstandardpaths_unix.cpp
{
#ifndef QT_BOOTSTRAPPED
    const QString &org = QCoreApplication::organizationName();
    if (!org.isEmpty())
        path += QLatin1Char('/') + org;
    const QString &appName = QCoreApplication::applicationName();
    if (!appName.isEmpty())
        path += QLatin1Char('/') + appName;
#else // !QT_BOOTSTRAPPED
    Q_UNUSED(path)
#endif
}

static inline void appendTestMode(QString &path)
{
    if (QStandardPaths::isTestModeEnabled())
        path += QLatin1String("/qttest");
}

// Map QStandardPaths::StandardLocation to KNOWNFOLDERID of SHGetKnownFolderPath()
static GUID writableSpecialFolderId(QStandardPaths::StandardLocation type)
{
    static const GUID folderIds[] = {
        FOLDERID_Desktop,       // DesktopLocation
        FOLDERID_Documents,     // DocumentsLocation
        FOLDERID_Fonts,         // FontsLocation
        FOLDERID_Programs,      // ApplicationsLocation
        FOLDERID_Music,         // MusicLocation
        FOLDERID_Videos,        // MoviesLocation
        FOLDERID_Pictures,      // PicturesLocation
        GUID(), GUID(),         // TempLocation/HomeLocation
        FOLDERID_LocalAppData,  // AppLocalDataLocation ("Local" path), AppLocalDataLocation = DataLocation
        GUID(),                 // CacheLocation
        FOLDERID_LocalAppData,  // GenericDataLocation ("Local" path)
        GUID(),                 // RuntimeLocation
        FOLDERID_LocalAppData,  // ConfigLocation ("Local" path)
        GUID(), GUID(),         // DownloadLocation/GenericCacheLocation
        FOLDERID_LocalAppData,  // GenericConfigLocation ("Local" path)
        FOLDERID_RoamingAppData,// AppDataLocation ("Roaming" path)
        FOLDERID_LocalAppData,  // AppConfigLocation ("Local" path)
    };

    Q_STATIC_ASSERT(sizeof(folderIds) / sizeof(folderIds[0]) == size_t(QStandardPaths::AppConfigLocation + 1));
    return size_t(type) < sizeof(folderIds) / sizeof(folderIds[0]) ? folderIds[type] : GUID();
}

// Convenience for SHGetKnownFolderPath().
static QString sHGetKnownFolderPath(const GUID &clsid)
{
    QString result;
    typedef HRESULT (WINAPI *GetKnownFolderPath)(const GUID&, DWORD, HANDLE, LPWSTR*);

    static const GetKnownFolderPath sHGetKnownFolderPath = // Vista onwards.
        reinterpret_cast<GetKnownFolderPath>(QSystemLibrary::resolve(QLatin1String("shell32"), "SHGetKnownFolderPath"));

    LPWSTR path;
    if (Q_LIKELY(sHGetKnownFolderPath && SUCCEEDED(sHGetKnownFolderPath(clsid, KF_FLAG_DONT_VERIFY, 0, &path)))) {
        result = convertCharArray(path);
        CoTaskMemFree(path);
    }
    return result;
}

QString QStandardPaths::writableLocation(StandardLocation type)
{
    QString result;
    switch (type) {
    case DownloadLocation:
        result = sHGetKnownFolderPath(FOLDERID_Downloads);
        if (result.isEmpty())
            result = QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation);
        break;

    case CacheLocation:
        // Although Microsoft has a Cache key it is a pointer to IE's cache, not a cache
        // location for everyone.  Most applications seem to be using a
        // cache directory located in their AppData directory
        result = sHGetKnownFolderPath(writableSpecialFolderId(AppLocalDataLocation));
        if (!result.isEmpty()) {
            appendTestMode(result);
            appendOrganizationAndApp(result);
            result += QLatin1String("/cache");
        }
        break;

    case GenericCacheLocation:
        result = sHGetKnownFolderPath(writableSpecialFolderId(GenericDataLocation));
        if (!result.isEmpty()) {
            appendTestMode(result);
            result += QLatin1String("/cache");
        }
        break;

    case RuntimeLocation:
    case HomeLocation:
        result = QDir::homePath();
        break;

    case TempLocation:
        result = QDir::tempPath();
        break;

    default:
        result = sHGetKnownFolderPath(writableSpecialFolderId(type));
        if (!result.isEmpty() && isConfigLocation(type)) {
            appendTestMode(result);
            if (!isGenericConfigLocation(type))
                appendOrganizationAndApp(result);
        }
        break;
    }
    return result;
}

#ifndef QT_BOOTSTRAPPED
extern QString qAppFileName();
#endif

QStringList QStandardPaths::standardLocations(StandardLocation type)
{
    QStringList dirs;
    const QString localDir = writableLocation(type);
    if (!localDir.isEmpty())
        dirs.append(localDir);

    // type-specific handling goes here
    if (isConfigLocation(type)) {
        QString programData = sHGetKnownFolderPath(FOLDERID_ProgramData);
        if (!programData.isEmpty()) {
            if (!isGenericConfigLocation(type))
                appendOrganizationAndApp(programData);
            dirs.append(programData);
        }
#ifndef QT_BOOTSTRAPPED
        // Note: QCoreApplication::applicationDirPath(), while static, requires
        // an application instance. But we might need to resolve the standard
        // locations earlier than that, so we fall back to qAppFileName().
        QString applicationDirPath = qApp ? QCoreApplication::applicationDirPath()
            : QFileInfo(qAppFileName()).path();
        dirs.append(applicationDirPath);
        const QString dataDir = applicationDirPath + QLatin1String("/data");
        dirs.append(dataDir);

        if (!isGenericConfigLocation(type)) {
            QString appDataDir = dataDir;
            appendOrganizationAndApp(appDataDir);
            if (appDataDir != dataDir)
                dirs.append(appDataDir);
        }
#endif // !QT_BOOTSTRAPPED
    } // isConfigLocation()

    return dirs;
}

QT_END_NAMESPACE

#endif // QT_NO_STANDARDPATHS
