# This file is part of Buildbot.  Buildbot is free software: you can
# redistribute it and/or modify it under the terms of the GNU General Public
# License as published by the Free Software Foundation, version 2.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along with
# this program; if not, write to the Free Software Foundation, Inc., 51
# Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# Copyright Buildbot Team Members


from buildbot.steps.source.git import Git


class Gerrit(Git):
    def run_vc(self, branch, revision, patch):
        gerrit_branch = None

        changed_project = self.build.getProperty('event.change.project')
        if not self.sourcestamp or (self.sourcestamp.project != changed_project):
            # If we don't have a sourcestamp, or the project is  wrong, this
            # isn't the repo that's changed.  Drop through and check out the
            # head of the given branch
            pass
        elif self.build.hasProperty("event.patchSet.ref"):
            gerrit_branch = self.build.getProperty("event.patchSet.ref")
            self.updateSourceProperty("gerrit_branch", gerrit_branch)
        else:
            try:
                change = self.build.getProperty("gerrit_change", '').split('/')
                if len(change) == 2:
                    gerrit_branch = (
                        f"refs/changes/{(int(change[0]) % 100):2}/{int(change[0])}/{int(change[1])}"
                    )
                    self.updateSourceProperty("gerrit_branch", gerrit_branch)
            except Exception:
                pass

        branch = gerrit_branch or branch
        return super().run_vc(branch, revision, patch)
