#
# Copyright 2013 Red Hat, Inc
#
# Author: Eoghan Glynn <eglynn@redhat.com>
#
# 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.
"""Tests for ceilometer.alarm.service.SingletonAlarmService.
"""
import mock

from oslo.config import cfg

from stevedore import extension

from ceilometer.alarm import service
from ceilometer import messaging
from ceilometer.openstack.common import test


class TestSingletonAlarmService(test.BaseTestCase):
    def setUp(self):
        super(TestSingletonAlarmService, self).setUp()
        messaging.setup('fake://')
        self.addCleanup(messaging.cleanup)

        self.threshold_eval = mock.Mock()
        self.evaluators = extension.ExtensionManager.make_test_instance(
            [
                extension.Extension(
                    'threshold',
                    None,
                    None,
                    self.threshold_eval),
            ]
        )
        self.api_client = mock.MagicMock()
        self.singleton = service.SingletonAlarmService()
        self.singleton.tg = mock.Mock()
        self.singleton.evaluators = self.evaluators
        self.singleton.supported_evaluators = ['threshold']

    def test_start(self):
        test_interval = 120
        cfg.CONF.set_override('evaluation_interval',
                              test_interval,
                              group='alarm')
        with mock.patch('ceilometerclient.client.get_client',
                        return_value=self.api_client):
            self.singleton.start()
            expected = [
                mock.call(test_interval,
                          self.singleton._evaluate_assigned_alarms,
                          0),
                mock.call(604800, mock.ANY),
            ]
            actual = self.singleton.tg.add_timer.call_args_list
            self.assertEqual(expected, actual)

    def test_evaluation_cycle(self):
        alarm = mock.Mock(type='threshold')
        self.api_client.alarms.list.return_value = [alarm]
        with mock.patch('ceilometerclient.client.get_client',
                        return_value=self.api_client):
            self.singleton._evaluate_assigned_alarms()
            self.threshold_eval.evaluate.assert_called_once_with(alarm)

    def test_unknown_extension_skipped(self):
        alarms = [
            mock.Mock(type='not_existing_type'),
            mock.Mock(type='threshold')
        ]

        self.api_client.alarms.list.return_value = alarms
        with mock.patch('ceilometerclient.client.get_client',
                        return_value=self.api_client):
            self.singleton.start()
            self.singleton._evaluate_assigned_alarms()
            self.threshold_eval.evaluate.assert_called_once_with(alarms[1])

    def test_singleton_endpoint_types(self):
        endpoint_types = ["internalURL", "publicURL"]
        for endpoint_type in endpoint_types:
            cfg.CONF.set_override('os_endpoint_type',
                                  endpoint_type,
                                  group='service_credentials')
            with mock.patch('ceilometerclient.client.get_client') as client:
                self.singleton.api_client = None
                self.singleton._evaluate_assigned_alarms()
                conf = cfg.CONF.service_credentials
                expected = [mock.call(2,
                                      os_auth_url=conf.os_auth_url,
                                      os_region_name=conf.os_region_name,
                                      os_tenant_name=conf.os_tenant_name,
                                      os_password=conf.os_password,
                                      os_username=conf.os_username,
                                      os_cacert=conf.os_cacert,
                                      os_endpoint_type=conf.os_endpoint_type,
                                      insecure=conf.insecure)]
                actual = client.call_args_list
                self.assertEqual(expected, actual)