#!/usr/bin/python3
#
# Check PTL/liaison has approved release
#
# Copyright 2019 Thierry Carrez <thierry@openstack.org>
# All Rights Reserved.
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.

import argparse
import json
import logging
import os
import sys

from openstack_governance import governance
import requests
from requests.packages import urllib3
import yaml


GERRIT_URL = 'https://review.opendev.org/'
LOG = logging.getLogger(__name__)

# Turn of warnings about bad SSL config.
# https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
urllib3.disable_warnings()


def get_team(deliverablefile):
    with open(deliverablefile, 'r') as dfile:
        team = yaml.safe_load(dfile)['team']
    return team


def get_liaisons(team):
    with open('data/release_liaisons.yaml', 'r') as lfile:
        liaisons = yaml.safe_load(lfile)
    if team in liaisons:
        return [i['email'] for i in liaisons[team]]
    else:
        print('WARNING: %s team does not exist in liaisons file' % team)
        return []


class GerritChange(object):

    def __init__(self, gov_data, changeid):
        # Load governance data
        self.gov_data = governance.Governance.from_remote_repo()

        # Grab changeid details from Gerrit
        call = 'changes/%s' % changeid + \
               '?o=CURRENT_REVISION&o=CURRENT_FILES&o=DETAILED_LABELS' + \
               '&o=DETAILED_ACCOUNTS'
        raw = requests.get(GERRIT_URL + call)

        # Gerrit's REST API prepends a JSON-breaker to avoid XSS
        if raw.text.startswith(")]}'"):
            trimmed = raw.text[4:]
        else:
            trimmed = raw.text

        # Try to decode and bail with much detail if it fails
        try:
            decoded = json.loads(trimmed)
        except Exception:
            LOG.error(
                '\nrequest returned %s error to query:\n\n    %s\n'
                '\nwith detail:\n\n    %s\n',
                raw, raw.url, trimmed)
            raise

        # Instantiate object with retrieved data
        self.raw_data = decoded
        self.approvers = [i['email']
                          for i in decoded['labels']['Code-Review']['all']
                          if i['value'] > 0]
        self.approvers.append(decoded['owner']['email'])
        currev = decoded['current_revision']
        self.deliv_files = list(decoded['revisions'][currev]['files'].keys())

    def is_approved(self):
        LOG.debug('Approvals: %s' % self.approvers)
        approved = True
        for deliv_file in self.deliv_files:
            team = get_team(deliv_file)
            try:
                govteam = self.gov_data.get_team(team)
            except ValueError:
                print('✕ %s mentions unknown team %s' % (deliv_file, team))
                approved = False
                break

            # Check that deliverable is indeed defined in governance team
            delivname, _ = os.path.splitext(os.path.basename(deliv_file))
            if delivname not in govteam.deliverables:
                print('✕ %s not in %s governance' % (deliv_file, team))
                approved = False
                break

            # Fetch PTL and release liaisons
            liaisons = get_liaisons(team)
            if 'email' in govteam.ptl:
                liaisons.append(govteam.ptl['email'])
            LOG.debug('%s needs %s' % (deliv_file, liaisons))

            for approver in self.approvers:
                if approver in liaisons:
                    print('✓ %s validated by %s' % (deliv_file, approver))
                    break
            else:
                print('✕ %s missing PTL/liaison approval' % deliv_file)
                approved = False
        return approved


def main(args=sys.argv[1:]):
    parser = argparse.ArgumentParser()
    parser.add_argument('changeid')
    parser.add_argument("--debug", action='store_true')
    args = parser.parse_args(args)

    if (args.debug):
        logging.basicConfig(level=logging.DEBUG)

    gov_data = governance.Governance.from_remote_repo()
    change = GerritChange(gov_data, args.changeid)

    if not change.is_approved():
        sys.exit(1)


if __name__ == '__main__':
    main()