#!/usr/bin/env python
# -*- coding: utf-8 -*-

"""
 (c) 2016 - Copyright Red Hat Inc

 Authors:
   Pierre-Yves Chibon <pingou@pingoured.fr>


This server listens to message sent via redis and send the corresponding
web-hook request.

Using this mechanism, we no longer block the main application if the
receiving end is offline or so.

"""

import json
import logging
import os
import requests

import trollius
import trollius_redis


LOG = logging.getLogger(__name__)

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


import pagure
import pagure.lib


@trollius.coroutine
def handle_messages():
    ''' Handles connecting to redis and acting upon messages received.
    In this case, it means triggering a build on jenkins based on the
    information provided.
    '''

    host = pagure.APP.config.get('REDIS_HOST', '0.0.0.0')
    port = pagure.APP.config.get('REDIS_PORT', 6379)
    dbname = pagure.APP.config.get('REDIS_DB', 0)
    connection = yield trollius.From(trollius_redis.Connection.create(
        host=host, port=port, db=dbname))

    # Create subscriber.
    subscriber = yield trollius.From(connection.start_subscribe())

    # Subscribe to channel.
    yield trollius.From(subscriber.subscribe(['pagure.ci']))

    # Inside a while loop, wait for incoming events.
    while True:
        reply = yield trollius.From(subscriber.next_published())
        LOG.info(
            'Received: %s on channel: %s',
            repr(reply.value), reply.channel)
        data = json.loads(reply.value)

        pr_id = data['pr']['id']
        pr_uid = data['pr']['uid']
        branch = data['pr']['branch_from']
        LOG.info('Looking for PR: %s', pr_uid)
        session = pagure.lib.create_session(pagure.APP.config['DB_URL'])
        request = pagure.lib.get_request_by_uid(session, pr_uid)

        LOG.info('PR retrieved: %s', request)

        if not request:
            LOG.warning(
                'No request could be found from the message %s', data)
            session.close()
            continue

        LOG.info(
            "Trigger on %s PR #%s from %s: %s",
            request.project.fullname, pr_id,
            request.project_from.fullname, branch)

        url = request.project.ci_hook.ci_url.rstrip('/')

        if data['ci_type'] == 'jenkins':
            url = url + '/buildWithParameters'
            repo = '%s/%s' % (
                pagure.APP.config['GIT_URL_GIT'].rstrip('/'),
                request.project_from.path)
            LOG.info(
                'Triggering the build at: %s, for repo: %s', url, repo)
            requests.post(
                url,
                data={
                    'token': request.project.ci_hook.pagure_ci_token,
                    'cause': pr_id,
                    'REPO': repo,
                    'BRANCH': branch
                }
            )
        else:
            LOG.warning('Un-supported CI type')

        session.close()
        LOG.info('Ready for another')


def main():
    ''' Start the main async loop. '''

    try:
        loop = trollius.get_event_loop()
        tasks = [
            trollius.async(handle_messages()),
        ]
        loop.run_until_complete(trollius.wait(tasks))
        loop.run_forever()
    except KeyboardInterrupt:
        pass
    except trollius.ConnectionResetError:
        pass

    LOG.info("End Connection")
    loop.close()
    LOG.info("End")


if __name__ == '__main__':
    formatter = logging.Formatter(
        "%(asctime)s %(levelname)s [%(module)s:%(lineno)d] %(message)s")

    logging.basicConfig(level=logging.DEBUG)

    # setup console logging
    LOG.setLevel(logging.DEBUG)
    shellhandler = logging.StreamHandler()
    shellhandler.setLevel(logging.DEBUG)

    aslog = logging.getLogger("asyncio")
    aslog.setLevel(logging.DEBUG)
    aslog = logging.getLogger("trollius")
    aslog.setLevel(logging.DEBUG)

    shellhandler.setFormatter(formatter)
    LOG.addHandler(shellhandler)
    main()