#!/usr/bin/python2.7

# Copyright (C) 2012 Canonical, Ltd.
# Author: Brian Murray <brian@canonical.com>

# This program 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 3 of the License.
#
# 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, see <http://www.gnu.org/licenses/>.

# given a release find all the packages published in proposed and
# search each package for bug tasks about the package reported
# since the date the package was uploaded to proposed for apport and release
# tagged bugs that contain the version of the package from -proposed

from __future__ import print_function

import optparse

from launchpadlib.launchpad import Launchpad

try:
    from urllib.request import urlopen
except ImportError:
    from urllib import urlopen


def bugs_from_changes(change_url):
    '''Return (bug_list, cve_list) from a .changes file URL'''
    changelog = urlopen(change_url)

    refs = []
    bugs = set()

    for l in changelog:
        if l.startswith('Launchpad-Bugs-Fixed: '):
            refs = l.split()[1:]
            break

    for b in refs:
        try:
            lpbug = lp.bugs[int(b)]
        except KeyError:
            continue
        bugs.add(lpbug)

    return sorted(bugs)


if __name__ == '__main__':

    APPORT_TAGS = (
        'apport-package',
        'apport-bug',
        'apport-crash',
        'apport-kerneloops',
    )

    lp = Launchpad.login_with(
        'ubuntu-archive-tools', 'production', version='devel')

    ubuntu = lp.distributions['ubuntu']
    archive = ubuntu.getArchive(name='primary')

    parser = optparse.OptionParser(usage="usage: %prog --release RELEASE")
    parser.add_option('--release', help='', dest='release')

    (opt, args) = parser.parse_args()

    releases = {}
    if not opt.release:
        for series in ubuntu.series:
            if not series.supported:
                continue
            if series.active:
                releases[series.name] = series
    else:
        series = ubuntu.getSeries(name_or_version=opt.release)
        releases[series.name] = series

    for release in sorted(releases):
        print('Release: %s' % release)
        for spph in archive.getPublishedSources(
                pocket='Proposed', status='Published',
                distro_series=releases[release]):
            package_name = spph.source_package_name
            # for langpack updates, only keep -en as a representative
            # cargo-culted from sru-report
            if (package_name.startswith('language-pack-') and
                package_name not in ('language-pack-en',
                                     'language-pack-en-base')):
                continue
            date_pub = spph.date_published
            version = spph.source_package_version
            change_url = spph.changesFileUrl()

            if not change_url:
                print("Package %s has no changes file url")
                continue

            package = ubuntu.getSourcePackage(name=package_name)
            tasks = []
            # search for bugs reported by apport
            for tag in APPORT_TAGS:
                for task in package.searchTasks(
                        tags=[tag, release], created_since=date_pub,
                        tags_combinator='All'):
                    tasks.append(task)
            # also search for ones tagged regression-proposed
            for task in package.searchTasks(
                    tags=['regression-proposed', release],
                    created_since=date_pub, tags_combinator='All'):
                tasks.append(task)

            for task in tasks:
                if version not in task.bug.description:
                    continue
                sru_bugs = bugs_from_changes(change_url)
                # check to see if any of the sru bugs are already tagged
                # verification-failed
                v_failed = False
                for sru_bug in sru_bugs:
                    if 'verification-failed' in sru_bug.tags:
                        print('  The SRU for package %s already has a '
                              'verification-failed bug in LP: #%s' %
                              (package_name, sru_bug.id))
                        v_failed = True
                bug = task.bug
                if not v_failed and set(APPORT_TAGS).intersection(bug.tags):
                    print('  LP: #%s is regarding %s from -proposed' %
                          (bug.id, package_name))
                elif not v_failed:
                    print('  LP: #%s is regarding %s from -proposed and '
                          'tagged regression-proposed' %
                          (bug.id, package_name))