#! /usr/bin/env python2


"""Pagure specific hook to add comment on issues if the commits fixes or
relates to an issue.
"""

import os
import sys

import pygit2

from sqlalchemy.exc import SQLAlchemyError

if 'PAGURE_CONFIG' not in os.environ \
        and os.path.exists('/etc/pagure/pagure.cfg'):
    os.environ['PAGURE_CONFIG'] = '/etc/pagure/pagure.cfg'


import pagure
import pagure.exceptions
import pagure.lib.link


abspath = os.path.abspath(os.environ['GIT_DIR'])


def generate_revision_change_log(new_commits_list):

    print 'Detailed log of new commits:\n\n'
    commitid = None
    for line in pagure.lib.git.read_git_lines(
            ['log', '--no-walk'] + new_commits_list + ['--'], abspath):
        if line.startswith('commit'):
            commitid = line.split('commit ')[-1]

        line = line.strip()

        print '*', line
        for relation in pagure.lib.link.get_relation(
                pagure.SESSION,
                pagure.lib.git.get_repo_name(abspath),
                pagure.lib.git.get_username(abspath),
                pagure.lib.git.get_repo_namespace(abspath),
                line,
                'fixes',
                include_prs=True):
            fixes_relation(commitid, relation,
                           pagure.APP.config.get('APP_URL'))

        for issue in pagure.lib.link.get_relation(
                pagure.SESSION,
                pagure.lib.git.get_repo_name(abspath),
                pagure.lib.git.get_username(abspath),
                pagure.lib.git.get_repo_namespace(abspath),
                line,
                'relates'):
            relates_commit(commitid, issue, pagure.APP.config.get('APP_URL'))


def relates_commit(commitid, issue, app_url=None):
    ''' Add a comment to an issue that this commit relates to it. '''

    url = '../%s' % commitid[:8]
    if app_url:
        if app_url.endswith('/'):
            app_url = app_url[:-1]
        project = issue.project.fullname
        if issue.project.is_fork:
            project = 'fork/%s' % project
        url = '%s/%s/c/%s' % (app_url, project, commitid[:8])

    comment = ''' Commit [%s](%s) relates to this ticket''' % (
        commitid[:8], url)

    try:
        pagure.lib.add_issue_comment(
            pagure.SESSION,
            issue=issue,
            comment=comment,
            user=pagure.lib.git.get_author_email(commitid, abspath),
            ticketfolder=pagure.APP.config['TICKETS_FOLDER'],
        )
        pagure.SESSION.commit()
    except pagure.exceptions.PagureException as err:
        print err
    except SQLAlchemyError as err:  # pragma: no cover
        pagure.SESSION.rollback()
        pagure.APP.logger.exception(err)


def fixes_relation(commitid, relation, app_url=None):
    ''' Add a comment to an issue or PR that this commit fixes it and update
    the status if the commit is in the master branch. '''

    url = '../c/%s' % commitid[:8]
    if app_url:
        if app_url.endswith('/'):
            app_url = app_url[:-1]
        project = relation.project.fullname
        if relation.project.is_fork:
            project = 'fork/%s' % project
        url = '%s/%s/c/%s' % (app_url, project, commitid[:8])

    comment = ''' Commit [%s](%s) fixes this %s''' % (
        commitid[:8], url, relation.isa)

    try:
        if relation.isa == 'issue':
            pagure.lib.add_issue_comment(
                pagure.SESSION,
                issue=relation,
                comment=comment,
                user=pagure.lib.git.get_author_email(commitid, abspath),
                ticketfolder=pagure.APP.config['TICKETS_FOLDER'],
            )
        elif relation.isa == 'pull-request':
            pagure.lib.add_pull_request_comment(
                pagure.SESSION,
                request=relation,
                commit=None,
                tree_id=None,
                filename=None,
                row=None,
                comment=comment,
                user=pagure.lib.git.get_author_email(commitid, abspath),
                requestfolder=pagure.APP.config['REQUESTS_FOLDER'],
            )
        pagure.SESSION.commit()
    except pagure.exceptions.PagureException as err:
        print err
    except SQLAlchemyError as err:  # pragma: no cover
        pagure.SESSION.rollback()
        pagure.APP.logger.exception(err)

    try:
        if relation.isa == 'issue':
            pagure.lib.edit_issue(
                pagure.SESSION,
                relation,
                ticketfolder=pagure.APP.config['TICKETS_FOLDER'],
                user=pagure.lib.git.get_author_email(commitid, abspath),
                status='Fixed')
        elif relation.isa == 'pull-request':
            pagure.lib.close_pull_request(
                pagure.SESSION,
                relation,
                requestfolder=pagure.APP.config['REQUESTS_FOLDER'],
                user=pagure.lib.git.get_author_email(commitid, abspath),
                merged=True)
        pagure.SESSION.commit()
    except pagure.exceptions.PagureException as err:
        print err
    except SQLAlchemyError as err:  # pragma: no cover
        pagure.SESSION.rollback()
        pagure.APP.logger.exception(err)


def run_as_post_receive_hook():

    for line in sys.stdin:
        if pagure.APP.config.get('HOOK_DEBUG', False):
            print line
        (oldrev, newrev, refname) = line.strip().split(' ', 2)

        if pagure.APP.config.get('HOOK_DEBUG', False):
            print '  -- Old rev'
            print oldrev
            print '  -- New rev'
            print newrev
            print '  -- Ref name'
            print refname

        # Retrieve the default branch
        repo_obj = pygit2.Repository(abspath)
        default_branch = None
        if not repo_obj.is_empty and not repo_obj.head_is_unborn:
            default_branch = repo_obj.head.shorthand

        # Skip all branch but the default one
        refname = refname.replace('refs/heads/', '')
        if refname != default_branch:
            continue

        if set(newrev) == set(['0']):
            print "Deleting a reference/branch, so we won't run the "\
                "pagure hook"
            return

        generate_revision_change_log(
            pagure.lib.git.get_revs_between(oldrev, newrev, abspath, refname))

    if pagure.APP.config.get('HOOK_DEBUG', False):
        print 'repo:', pagure.lib.git.get_repo_name(abspath)
        print 'user:', pagure.lib.git.get_username(abspath)


def main(args):
        run_as_post_receive_hook()


if __name__ == '__main__':
    main(sys.argv[1:])