#    Copyright 2013 IBM Corp.
#
#    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 mock

from nova.db import api as db
from nova import exception
from nova.objects import instance_fault
from nova.tests.unit.objects import test_objects
from nova.tests import uuidsentinel as uuids


fake_faults = {
    'fake-uuid': [
        {'id': 1, 'instance_uuid': uuids.faults_instance, 'code': 123,
         'message': 'msg1', 'details': 'details', 'host': 'host',
         'deleted': False, 'created_at': None, 'updated_at': None,
         'deleted_at': None},
        {'id': 2, 'instance_uuid': uuids.faults_instance, 'code': 456,
         'message': 'msg2', 'details': 'details', 'host': 'host',
         'deleted': False, 'created_at': None, 'updated_at': None,
         'deleted_at': None},
        ]
    }


class _TestInstanceFault(object):
    @mock.patch.object(db, 'instance_fault_get_by_instance_uuids',
                       return_value=fake_faults)
    def test_get_latest_for_instance(self, get_mock):
        fault = instance_fault.InstanceFault.get_latest_for_instance(
            self.context, 'fake-uuid')
        for key in fake_faults['fake-uuid'][0]:
            self.assertEqual(fake_faults['fake-uuid'][0][key], fault[key])
        get_mock.assert_called_once_with(self.context, ['fake-uuid'])

    @mock.patch.object(db, 'instance_fault_get_by_instance_uuids',
                       return_value={})
    def test_get_latest_for_instance_with_none(self, get_mock):
        fault = instance_fault.InstanceFault.get_latest_for_instance(
            self.context, 'fake-uuid')
        self.assertIsNone(fault)
        get_mock.assert_called_once_with(self.context, ['fake-uuid'])

    @mock.patch.object(db, 'instance_fault_get_by_instance_uuids',
                       return_value=fake_faults)
    def test_get_by_instance(self, get_mock):
        faults = instance_fault.InstanceFaultList.get_by_instance_uuids(
            self.context, ['fake-uuid'])
        for index, db_fault in enumerate(fake_faults['fake-uuid']):
            for key in db_fault:
                self.assertEqual(fake_faults['fake-uuid'][index][key],
                                 faults[index][key])
        get_mock.assert_called_once_with(self.context, ['fake-uuid'])

    @mock.patch.object(db, 'instance_fault_get_by_instance_uuids',
                       return_value={})
    def test_get_by_instance_with_none(self, get_mock):
        faults = instance_fault.InstanceFaultList.get_by_instance_uuids(
            self.context, ['fake-uuid'])
        self.assertEqual(0, len(faults))
        get_mock.assert_called_once_with(self.context, ['fake-uuid'])

    @mock.patch('nova.cells.rpcapi.CellsAPI.instance_fault_create_at_top')
    @mock.patch('nova.db.api.instance_fault_create')
    def _test_create(self, update_cells, mock_create, cells_fault_create):
        mock_create.return_value = fake_faults['fake-uuid'][1]
        fault = instance_fault.InstanceFault(context=self.context)
        fault.instance_uuid = uuids.faults_instance
        fault.code = 456
        fault.message = 'foo'
        fault.details = 'you screwed up'
        fault.host = 'myhost'
        fault.create()
        self.assertEqual(2, fault.id)
        mock_create.assert_called_once_with(self.context,
            {'instance_uuid': uuids.faults_instance,
             'code': 456,
             'message': 'foo',
             'details': 'you screwed up',
             'host': 'myhost'})
        if update_cells:
            cells_fault_create.assert_called_once_with(
                    self.context, fake_faults['fake-uuid'][1])
        else:
            self.assertFalse(cells_fault_create.called)

    def test_create_no_cells(self):
        self.flags(enable=False, group='cells')
        self._test_create(False)

    def test_create_api_cell(self):
        self.flags(cell_type='api', enable=True, group='cells')
        self._test_create(False)

    def test_create_compute_cell(self):
        self.flags(cell_type='compute', enable=True, group='cells')
        self._test_create(True)

    def test_create_already_created(self):
        fault = instance_fault.InstanceFault(context=self.context)
        fault.id = 1
        self.assertRaises(exception.ObjectActionError,
                          fault.create)


class TestInstanceFault(test_objects._LocalTest,
                        _TestInstanceFault):
    pass


class TestInstanceFaultRemote(test_objects._RemoteTest,
                              _TestInstanceFault):
    pass