# Copyright 2011 OpenStack LLC.
# 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 json

import stubout

import nova
from nova import context
from nova import flags
from nova import log
from nova import rpc
import nova.notifier.api
from nova.notifier.api import notify
from nova.notifier import no_op_notifier
from nova.notifier import rabbit_notifier
from nova import test


class NotifierTestCase(test.TestCase):
    """Test case for notifications"""
    def setUp(self):
        super(NotifierTestCase, self).setUp()
        self.stubs = stubout.StubOutForTesting()

    def tearDown(self):
        self.stubs.UnsetAll()
        super(NotifierTestCase, self).tearDown()

    def test_send_notification(self):
        self.notify_called = False

        def mock_notify(cls, *args):
            self.notify_called = True

        self.stubs.Set(nova.notifier.no_op_notifier, 'notify',
                mock_notify)

        class Mock(object):
            pass
        notify('publisher_id', 'event_type',
                nova.notifier.api.WARN, dict(a=3))
        self.assertEqual(self.notify_called, True)

    def test_verify_message_format(self):
        """A test to ensure changing the message format is prohibitively
        annoying"""

        def message_assert(message):
            fields = [('publisher_id', 'publisher_id'),
                      ('event_type', 'event_type'),
                      ('priority', 'WARN'),
                      ('payload', dict(a=3))]
            for k, v in fields:
                self.assertEqual(message[k], v)
            self.assertTrue(len(message['message_id']) > 0)
            self.assertTrue(len(message['timestamp']) > 0)

        self.stubs.Set(nova.notifier.no_op_notifier, 'notify',
                message_assert)
        notify('publisher_id', 'event_type',
                nova.notifier.api.WARN, dict(a=3))

    def test_send_rabbit_notification(self):
        self.stubs.Set(nova.flags.FLAGS, 'notification_driver',
                'nova.notifier.rabbit_notifier')
        self.mock_cast = False

        def mock_cast(cls, *args):
            self.mock_cast = True

        class Mock(object):
            pass

        self.stubs.Set(nova.rpc, 'cast', mock_cast)
        notify('publisher_id', 'event_type',
                nova.notifier.api.WARN, dict(a=3))

        self.assertEqual(self.mock_cast, True)

    def test_invalid_priority(self):
        def mock_cast(cls, *args):
            pass

        class Mock(object):
            pass

        self.stubs.Set(nova.rpc, 'cast', mock_cast)
        self.assertRaises(nova.notifier.api.BadPriorityException,
                notify, 'publisher_id',
                'event_type', 'not a priority', dict(a=3))

    def test_rabbit_priority_queue(self):
        self.stubs.Set(nova.flags.FLAGS, 'notification_driver',
                'nova.notifier.rabbit_notifier')
        self.stubs.Set(nova.flags.FLAGS, 'notification_topic',
                'testnotify')

        self.test_topic = None

        def mock_cast(context, topic, msg):
            self.test_topic = topic

        self.stubs.Set(nova.rpc, 'cast', mock_cast)
        notify('publisher_id',
                'event_type', 'DEBUG', dict(a=3))
        self.assertEqual(self.test_topic, 'testnotify.debug')

    def test_error_notification(self):
        self.stubs.Set(nova.flags.FLAGS, 'notification_driver',
            'nova.notifier.rabbit_notifier')
        self.stubs.Set(nova.flags.FLAGS, 'publish_errors', True)
        LOG = log.getLogger('nova')
        LOG.setup_from_flags()

        msgs = []
        def mock_cast(context, topic, data):
            msgs.append(data)
        self.stubs.Set(nova.rpc, 'cast', mock_cast) 
        LOG.error('foo');
        self.assertEqual(1, len(msgs))
        msg = msgs[0]
        self.assertEqual(msg['event_type'], 'error_notification')
        self.assertEqual(msg['priority'], 'ERROR')
        self.assertEqual(msg['payload']['error'], 'foo')