# Copyright 2013 eNovance
#
#    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 itertools

from oslo_utils import timeutils
import testscenarios

from oslo import messaging
from oslo.messaging.notify import dispatcher as notify_dispatcher
from oslo_messaging.tests import utils as test_utils
from six.moves import mock

load_tests = testscenarios.load_tests_apply_scenarios


notification_msg = dict(
    publisher_id="publisher_id",
    event_type="compute.start",
    payload={"info": "fuu"},
    message_id="uuid",
    timestamp=str(timeutils.utcnow())
)


class TestDispatcherScenario(test_utils.BaseTestCase):

    scenarios = [
        ('no_endpoints',
         dict(endpoints=[],
              endpoints_expect_calls=[],
              priority='info',
              ex=None,
              return_value=messaging.NotificationResult.HANDLED)),
        ('one_endpoints',
         dict(endpoints=[['warn']],
              endpoints_expect_calls=['warn'],
              priority='warn',
              ex=None,
              return_value=messaging.NotificationResult.HANDLED)),
        ('two_endpoints_only_one_match',
         dict(endpoints=[['warn'], ['info']],
              endpoints_expect_calls=[None, 'info'],
              priority='info',
              ex=None,
              return_value=messaging.NotificationResult.HANDLED)),
        ('two_endpoints_both_match',
         dict(endpoints=[['debug', 'info'], ['info', 'debug']],
              endpoints_expect_calls=['debug', 'debug'],
              priority='debug',
              ex=None,
              return_value=messaging.NotificationResult.HANDLED)),
        ('no_return_value',
         dict(endpoints=[['warn']],
              endpoints_expect_calls=['warn'],
              priority='warn',
              ex=None, return_value=None)),
        ('requeue',
         dict(endpoints=[['debug', 'warn']],
              endpoints_expect_calls=['debug'],
              priority='debug', msg=notification_msg,
              ex=None,
              return_value=messaging.NotificationResult.REQUEUE)),
        ('exception',
         dict(endpoints=[['debug', 'warn']],
              endpoints_expect_calls=['debug'],
              priority='debug', msg=notification_msg,
              ex=Exception,
              return_value=messaging.NotificationResult.HANDLED)),
    ]

    def test_dispatcher(self):
        endpoints = []
        for endpoint_methods in self.endpoints:
            e = mock.Mock(spec=endpoint_methods)
            endpoints.append(e)
            for m in endpoint_methods:
                method = getattr(e, m)
                if self.ex:
                    method.side_effect = self.ex()
                else:
                    method.return_value = self.return_value

        msg = notification_msg.copy()
        msg['priority'] = self.priority

        targets = [messaging.Target(topic='notifications')]
        dispatcher = notify_dispatcher.NotificationDispatcher(
            targets, endpoints, None, allow_requeue=True, pool=None)

        # check it listen on wanted topics
        self.assertEqual(sorted(set((targets[0], prio)
                                    for prio in itertools.chain.from_iterable(
                                        self.endpoints))),
                         sorted(dispatcher._targets_priorities))

        incoming = mock.Mock(ctxt={}, message=msg)
        callback = dispatcher(incoming)
        callback.run()
        callback.done()

        # check endpoint callbacks are called or not
        for i, endpoint_methods in enumerate(self.endpoints):
            for m in endpoint_methods:
                if m == self.endpoints_expect_calls[i]:
                    method = getattr(endpoints[i], m)
                    method.assert_called_once_with(
                        {},
                        msg['publisher_id'],
                        msg['event_type'],
                        msg['payload'], {
                            'timestamp': mock.ANY,
                            'message_id': mock.ANY
                        })
                else:
                    self.assertEqual(0, endpoints[i].call_count)

        if self.ex:
            self.assertEqual(1, incoming.acknowledge.call_count)
            self.assertEqual(0, incoming.requeue.call_count)
        elif self.return_value == messaging.NotificationResult.HANDLED \
                or self.return_value is None:
            self.assertEqual(1, incoming.acknowledge.call_count)
            self.assertEqual(0, incoming.requeue.call_count)
        elif self.return_value == messaging.NotificationResult.REQUEUE:
            self.assertEqual(0, incoming.acknowledge.call_count)
            self.assertEqual(1, incoming.requeue.call_count)


class TestDispatcher(test_utils.BaseTestCase):

    @mock.patch('oslo_messaging.notify.dispatcher.LOG')
    def test_dispatcher_unknown_prio(self, mylog):
        msg = notification_msg.copy()
        msg['priority'] = 'what???'
        dispatcher = notify_dispatcher.NotificationDispatcher(
            [mock.Mock()], [mock.Mock()], None, allow_requeue=True, pool=None)
        callback = dispatcher(mock.Mock(ctxt={}, message=msg))
        callback.run()
        callback.done()
        mylog.warning.assert_called_once_with('Unknown priority "%s"',
                                              'what???')

    def test_dispatcher_executor_callback(self):
        endpoint = mock.Mock(spec=['warn'])
        endpoint_method = endpoint.warn
        endpoint_method.return_value = messaging.NotificationResult.HANDLED

        targets = [messaging.Target(topic='notifications')]
        dispatcher = notify_dispatcher.NotificationDispatcher(
            targets, [endpoint], None, allow_requeue=True)

        msg = notification_msg.copy()
        msg['priority'] = 'warn'

        incoming = mock.Mock(ctxt={}, message=msg)
        executor_callback = mock.Mock()
        callback = dispatcher(incoming, executor_callback)
        callback.run()
        callback.done()
        self.assertTrue(executor_callback.called)
        self.assertEqual(executor_callback.call_args[0][0], endpoint_method)