# Copyright 2012 Managed I.T.
#
# Author: Kiall Mac Innes <kiall@managedit.ie>
#
# 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 threading
from oslo.config import cfg
from oslo_log import log as logging

from designate.notification_handler.base import BaseAddressHandler


LOG = logging.getLogger(__name__)

cfg.CONF.register_group(cfg.OptGroup(
    name='handler:nova_fixed',
    title="Configuration for Nova Notification Handler"
))

cfg.CONF.register_opts([
    cfg.ListOpt('notification-topics', default=['notifications']),
    cfg.StrOpt('control-exchange', default='nova'),
    cfg.StrOpt('domain-id', default=None),
    cfg.StrOpt('format', default=None)
], group='handler:nova_fixed')


class NovaFixedHandler(BaseAddressHandler):
    """Handler for Nova's notifications"""
    __plugin_name__ = 'nova_fixed'
    lock = threading.Lock()

    def get_exchange_topics(self):
        exchange = cfg.CONF[self.name].control_exchange

        topics = [topic for topic in cfg.CONF[self.name].notification_topics]

        return (exchange, topics)

    def get_event_types(self):
        return [
            'compute.instance.create.end',
            'compute.instance.delete.start',
        ]

    def process_notification(self, context, event_type, payload):
        LOG.debug('NovaFixedHandler received notification - %s' % event_type)

        with self.lock:
            if event_type == 'compute.instance.create.end':
                self._create(payload['fixed_ips'], payload,
                             resource_id=payload['instance_id'],
                             resource_type='instance')

            elif event_type == 'compute.instance.delete.start':
                self._delete(resource_id=payload['instance_id'],
                             resource_type='instance')