# Copyright (c) 2011 OpenStack Foundation
# 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.
"""
Tests For HostManager
"""

import mock
from oslo_config import cfg
from oslo_utils import timeutils

from cinder import exception
from cinder.openstack.common.scheduler import filters
from cinder.scheduler import host_manager
from cinder import test


CONF = cfg.CONF


class FakeFilterClass1(filters.BaseHostFilter):
    def host_passes(self, host_state, filter_properties):
        pass


class FakeFilterClass2(filters.BaseHostFilter):
    def host_passes(self, host_state, filter_properties):
        pass


class HostManagerTestCase(test.TestCase):
    """Test case for HostManager class."""

    def setUp(self):
        super(HostManagerTestCase, self).setUp()
        self.host_manager = host_manager.HostManager()
        self.fake_hosts = [host_manager.HostState('fake_host%s' % x)
                           for x in xrange(1, 5)]

    def test_choose_host_filters_not_found(self):
        self.flags(scheduler_default_filters='FakeFilterClass3')
        self.host_manager.filter_classes = [FakeFilterClass1,
                                            FakeFilterClass2]
        self.assertRaises(exception.SchedulerHostFilterNotFound,
                          self.host_manager._choose_host_filters, None)

    def test_choose_host_filters(self):
        self.flags(scheduler_default_filters=['FakeFilterClass2'])
        self.host_manager.filter_classes = [FakeFilterClass1,
                                            FakeFilterClass2]

        # Test 'volume' returns 1 correct function
        filter_classes = self.host_manager._choose_host_filters(None)
        self.assertEqual(len(filter_classes), 1)
        self.assertEqual(filter_classes[0].__name__, 'FakeFilterClass2')