#    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.

from oslo_utils import uuidutils

from nova import context
from nova import exception
from nova import objects
from nova.objects import cell_mapping
from nova import test
from nova.tests import fixtures


SAMPLE_MAPPING = {'uuid': '',
                  'name': 'fake-cell',
                  'transport_url': 'rabbit:///',
                  'database_connection': 'mysql+pymysql:///'}


def create_mapping(**kwargs):
    args = SAMPLE_MAPPING.copy()
    if 'uuid' not in kwargs:
        args['uuid'] = uuidutils.generate_uuid()
    args.update(kwargs)
    ctxt = context.RequestContext()
    return cell_mapping.CellMapping._create_in_db(ctxt, args)


class CellMappingTestCase(test.NoDBTestCase):
    USES_DB_SELF = True

    def setUp(self):
        super(CellMappingTestCase, self).setUp()
        self.useFixture(fixtures.Database(database='api'))
        self.context = context.RequestContext('fake-user', 'fake-project')
        self.mapping_obj = cell_mapping.CellMapping()

    def test_get_by_uuid(self):
        mapping = create_mapping()
        db_mapping = self.mapping_obj._get_by_uuid_from_db(self.context,
                mapping['uuid'])
        for key in self.mapping_obj.fields.keys():
            self.assertEqual(db_mapping[key], mapping[key])

    def test_get_by_uuid_not_found(self):
        self.assertRaises(exception.CellMappingNotFound,
                self.mapping_obj._get_by_uuid_from_db, self.context,
                          uuidutils.generate_uuid())

    def test_save_in_db(self):
        mapping = create_mapping()
        self.mapping_obj._save_in_db(self.context, mapping['uuid'],
                {'name': 'meow'})
        db_mapping = self.mapping_obj._get_by_uuid_from_db(self.context,
                mapping['uuid'])
        self.assertNotEqual(db_mapping['name'], mapping['name'])
        for key in [key for key in self.mapping_obj.fields.keys()
                    if key not in ['name', 'updated_at']]:
            self.assertEqual(db_mapping[key], mapping[key])

    def test_destroy_in_db(self):
        mapping = create_mapping()
        self.mapping_obj._get_by_uuid_from_db(self.context, mapping['uuid'])
        self.mapping_obj._destroy_in_db(self.context, mapping['uuid'])
        self.assertRaises(exception.CellMappingNotFound,
                self.mapping_obj._get_by_uuid_from_db, self.context,
                mapping['uuid'])

    def test_destroy_in_db_not_found(self):
        self.assertRaises(exception.CellMappingNotFound,
                self.mapping_obj._destroy_in_db, self.context,
                uuidutils.generate_uuid())


class CellMappingListTestCase(test.NoDBTestCase):
    USES_DB_SELF = True

    def setUp(self):
        super(CellMappingListTestCase, self).setUp()
        self.useFixture(fixtures.Database(database='api'))

    def test_get_all(self):
        mappings = {}
        mapping = create_mapping()
        mappings[mapping['uuid']] = mapping
        mapping = create_mapping()
        mappings[mapping['uuid']] = mapping

        ctxt = context.RequestContext()
        db_mappings = cell_mapping.CellMappingList._get_all_from_db(ctxt)
        for db_mapping in db_mappings:
            mapping = mappings[db_mapping.uuid]
            for key in cell_mapping.CellMapping.fields.keys():
                self.assertEqual(db_mapping[key], mapping[key])

    def test_get_by_disabled(self):
        enabled_mapping = create_mapping(disabled=False)
        disabled_mapping = create_mapping(disabled=True)

        ctxt = context.RequestContext()
        mappings = cell_mapping.CellMappingList.get_all(ctxt)
        self.assertEqual(2, len(mappings))
        self.assertEqual(enabled_mapping['uuid'], mappings[0].uuid)
        self.assertEqual(disabled_mapping['uuid'], mappings[1].uuid)
        mappings = cell_mapping.CellMappingList.get_by_disabled(ctxt,
                                                                disabled=False)
        self.assertEqual(1, len(mappings))
        self.assertEqual(enabled_mapping['uuid'], mappings[0].uuid)
        mappings = cell_mapping.CellMappingList.get_by_disabled(ctxt,
                                                                disabled=True)
        self.assertEqual(1, len(mappings))
        self.assertEqual(disabled_mapping['uuid'], mappings[0].uuid)

    def test_get_by_project_id(self):
        ctxt = context.RequestContext()
        cell1 = objects.CellMapping.get_by_uuid(ctxt, create_mapping().uuid)
        cell2 = objects.CellMapping.get_by_uuid(ctxt, create_mapping().uuid)
        cell3 = objects.CellMapping.get_by_uuid(ctxt, create_mapping().uuid)
        cells = [cell1, cell2, cell3]

        # Proj1 is all in one cell
        for i in range(0, 5):
            uuid = uuidutils.generate_uuid()
            im = objects.InstanceMapping(context=ctxt,
                                         instance_uuid=uuid,
                                         cell_mapping=cell1,
                                         project_id='proj1')
            im.create()

        # Proj2 is in the first two cells
        for i in range(0, 5):
            uuid = uuidutils.generate_uuid()
            cell = cells[i % 2]
            im = objects.InstanceMapping(context=ctxt,
                                         instance_uuid=uuid,
                                         cell_mapping=cell,
                                         project_id='proj2')
            im.create()

        # One mapping has no cell. This helps ensure that our query
        # filters out any mappings that aren't tied to a cell.
        im = objects.InstanceMapping(context=ctxt,
                                     instance_uuid=uuidutils.generate_uuid(),
                                     cell_mapping=None,
                                     project_id='proj2')
        im.create()

        # Proj1 should only be in cell1 and we should only get back
        # a single mapping for it
        cells = objects.CellMappingList.get_by_project_id(ctxt, 'proj1')
        self.assertEqual(1, len(cells))
        self.assertEqual(cell1.uuid, cells[0].uuid)

        cells = objects.CellMappingList.get_by_project_id(ctxt, 'proj2')
        self.assertEqual(2, len(cells))
        self.assertEqual(sorted([cell1.uuid, cell2.uuid]),
                         sorted([cm.uuid for cm in cells]))