# Copyright 2013: Mirantis Inc.
# 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 os

import mock
from oslo_config import fixture
from oslotest import base

from rally import db
from tests.unit import fakes


class DatabaseFixture(fixture.Config):
    """Create clean DB before starting test."""
    def setUp(self):
        super(DatabaseFixture, self).setUp()
        db_url = os.environ.get("RALLY_UNITTEST_DB_URL", "sqlite://")
        db.db_cleanup()
        self.conf.set_default("connection", db_url, group="database")
        db.db_drop()
        db.db_create()


class TestCase(base.BaseTestCase):
    """Test case base class for all unit tests."""

    def setUp(self):
        super(TestCase, self).setUp()
        self.addCleanup(mock.patch.stopall)

    def _test_atomic_action_timer(self, atomic_actions, name):
        action_duration = atomic_actions.get(name)
        self.assertIsNotNone(action_duration)
        self.assertIsInstance(action_duration, float)

    def assertSequenceEqual(self, iterable_1, iterable_2):
        self.assertEqual(tuple(iterable_1), tuple(iterable_2))


class DBTestCase(TestCase):
    """Base class for tests which use DB."""

    def setUp(self):
        super(DBTestCase, self).setUp()
        self.useFixture(DatabaseFixture())


class ClientsTestCase(TestCase):
    """Base class for Scenario tests using mocked self.clients."""

    def client_factory(self, client_type, version=None, admin=False):
        """Create a new client object."""
        return mock.MagicMock(client_type=client_type,
                              version=version,
                              admin=admin)

    def clients(self, client_type, version=None, admin=False):
        """Get a mocked client."""
        key = (client_type, version, admin)
        if key not in self._clients:
            self._clients[key] = self.client_factory(client_type,
                                                     version=version,
                                                     admin=admin)
        return self._clients[key]

    def admin_clients(self, client_type, version=None):
        """Get a mocked admin client."""
        return self.clients(client_type, version=version, admin=True)

    def client_created(self, client_type, version=None, admin=False):
        """Determine if a client has been created.

        This can be used to see if a scenario calls
        'self.clients("foo")', without checking to see what was done
        with the client object returned by that call.
        """
        key = (client_type, version, admin)
        return key in self._clients

    def setUp(self):
        super(ClientsTestCase, self).setUp()
        self._clients = {}
        self._client_mocks = [
            mock.patch("rally.benchmark.scenarios.base.Scenario.clients",
                       mock.Mock(side_effect=self.clients)),
            mock.patch("rally.benchmark.scenarios.base.Scenario.admin_clients",
                       mock.Mock(side_effect=self.admin_clients))
        ]
        for patcher in self._client_mocks:
            patcher.start()

    def tearDown(self):
        for patcher in self._client_mocks:
            patcher.stop()
        super(ClientsTestCase, self).tearDown()


class FakeClientsTestCase(ClientsTestCase):
    """Base class for Scenario tests using fake (not mocked) self.clients."""

    def client_factory(self, client_type, version=None, admin=False):
        return getattr(self._fake_clients, client_type)()

    def setUp(self):
        super(FakeClientsTestCase, self).setUp()
        self._fake_clients = fakes.FakeClients()