# 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
import six
import sqlalchemy

from alembic import script as alembic_script

from barbican.common import config
from barbican.common import exception
from barbican.model.migration import commands as migration
from barbican.model import models
from barbican.model import repositories
from barbican.tests import database_utils
from barbican.tests import utils

from oslo_config import cfg


class WhenCleaningRepositoryPagingParameters(utils.BaseTestCase):

    def setUp(self):
        super(WhenCleaningRepositoryPagingParameters, self).setUp()
        self.CONF = config.CONF
        self.default_limit = self.CONF.default_limit_paging

    def test_parameters_not_assigned(self):
        """The cleaner should use defaults when params are not specified."""
        clean_offset, clean_limit = repositories.clean_paging_values()

        self.assertEqual(0, clean_offset)
        self.assertEqual(self.default_limit, clean_limit)

    def test_limit_as_none(self):
        """When Limit is set to None it should use the default limit."""
        offset = 0
        clean_offset, clean_limit = repositories.clean_paging_values(
            offset_arg=offset,
            limit_arg=None)

        self.assertEqual(offset, clean_offset)
        self.assertEqual(self.default_limit, clean_limit)

    def test_offset_as_none(self):
        """When Offset is set to None it should use an offset of 0."""
        clean_offset, clean_limit = repositories.clean_paging_values(
            offset_arg=None,
            limit_arg=self.default_limit)

        self.assertEqual(0, clean_offset)
        self.assertEqual(self.default_limit, clean_limit)

    def test_limit_as_uncastable_str(self):
        """When Limit cannot be cast to an int, expect the default."""
        clean_offset, clean_limit = repositories.clean_paging_values(
            offset_arg=0,
            limit_arg='boom')
        self.assertEqual(0, clean_offset)
        self.assertEqual(self.default_limit, clean_limit)

    def test_offset_as_uncastable_str(self):
        """When Offset cannot be cast to an int, it should be zero."""
        clean_offset, clean_limit = repositories.clean_paging_values(
            offset_arg='boom',
            limit_arg=self.default_limit)
        self.assertEqual(0, clean_offset)
        self.assertEqual(self.default_limit, clean_limit)

    def test_limit_is_less_than_one(self):
        """Offset should default to 1."""
        limit = -1
        clean_offset, clean_limit = repositories.clean_paging_values(
            offset_arg=1,
            limit_arg=limit)
        self.assertEqual(1, clean_offset)
        self.assertEqual(1, clean_limit)

    def test_limit_is_too_big(self):
        """Limit should max out at configured value."""
        limit = self.CONF.max_limit_paging + 10
        clean_offset, clean_limit = repositories.clean_paging_values(
            offset_arg=1,
            limit_arg=limit)
        self.assertEqual(self.CONF.max_limit_paging, clean_limit)

    def test_offset_is_too_big(self):
        """When Offset exceeds sys.maxsize, it should be zero."""
        clean_offset, clean_limit = repositories.clean_paging_values(
            offset_arg=265613988875874769338781322035779626829233452653394495,
            limit_arg=self.default_limit)
        self.assertEqual(0, clean_offset)
        self.assertEqual(self.default_limit, clean_limit)


class WhenInvokingExceptionMethods(utils.BaseTestCase):

    def setUp(self):
        super(WhenInvokingExceptionMethods, self).setUp()
        self.CONF = config.CONF

        self.entity_id = '123456'
        self.entity_name = 'test_entity'

    def test_should_raise_for_entity_not_found(self):

        exception_result = self.assertRaises(
            exception.NotFound,
            repositories._raise_entity_not_found,
            self.entity_name,
            self.entity_id)

        self.assertEqual(
            "No test_entity found with ID 123456",
            six.text_type(exception_result))

    def test_should_raise_for_entity_id_not_found(self):

        exception_result = self.assertRaises(
            exception.NotFound,
            repositories._raise_entity_id_not_found,
            self.entity_id)

        self.assertEqual(
            "Entity ID 123456 not found",
            six.text_type(exception_result))

    def test_should_raise_for_no_entities_found(self):

        exception_result = self.assertRaises(
            exception.NotFound,
            repositories._raise_no_entities_found,
            self.entity_name)

        self.assertEqual(
            "No entities of type test_entity found",
            six.text_type(exception_result))


class WhenTestingBaseRepository(database_utils.RepositoryTestCase):

    def setUp(self):
        super(WhenTestingBaseRepository, self).setUp()
        self.repo = repositories.BaseRepo()

    def test_should_raise_invalid_create_from_no_entity(self):
        exception_result = self.assertRaises(
            exception.Invalid,
            self.repo.create_from,
            None)

        self.assertEqual(
            "Must supply non-None Entity.",
            six.text_type(exception_result))

    def test_should_raise_invalid_create_from_entity_with_id(self):
        entity = models.ModelBase()
        entity.id = '1234'

        exception_result = self.assertRaises(
            exception.Invalid,
            self.repo.create_from,
            entity)

        self.assertEqual(
            "Must supply Entity with id=None (i.e. new entity).",
            six.text_type(exception_result))

    def test_should_raise_invalid_do_validate_no_status(self):
        exception_result = self.assertRaises(
            exception.Invalid,
            self.repo._do_validate,
            {})

        self.assertEqual(
            "Entity status is required.",
            six.text_type(exception_result))

    def test_should_raise_invalid_do_validate_bad_status(self):
        exception_result = self.assertRaises(
            exception.Invalid,
            self.repo._do_validate,
            dict(status='BOGUS_STATUS'))

        self.assertEqual(
            "Invalid status 'BOGUS_STATUS' for Entity.",
            six.text_type(exception_result))


class WhenTestingWrapDbError(utils.BaseTestCase):

    def setUp(self):
        super(WhenTestingWrapDbError, self).setUp()
        repositories.CONF.set_override("sql_max_retries", 0)
        repositories.CONF.set_override("sql_retry_interval", 0)

    @mock.patch('barbican.model.repositories.is_db_connection_error')
    def test_should_raise_operational_error_is_connection_error(
            self, mock_is_db_error):
        mock_is_db_error.return_value = True

        @repositories.wrap_db_error
        def test_function():
            raise sqlalchemy.exc.OperationalError(
                'statement', 'params', 'orig')

        self.assertRaises(
            sqlalchemy.exc.OperationalError,
            test_function)


class WhenTestingGetEnginePrivate(utils.BaseTestCase):

    def setUp(self):
        super(WhenTestingGetEnginePrivate, self).setUp()

        repositories.CONF.set_override("sql_connection", "connection")

    @mock.patch('barbican.model.repositories._create_engine')
    def test_should_raise_value_exception_engine_create_failure(
            self, mock_create_engine):
        engine = mock.MagicMock()
        engine.connect.side_effect = ValueError('Abort!')
        mock_create_engine.return_value = engine

        exception_result = self.assertRaises(
            exception.BarbicanException,
            repositories._get_engine,
            None)

        self.assertEqual(
            'Error configuring registry database with supplied '
            'sql_connection. Got error: Abort!',
            six.text_type(exception_result))

    @mock.patch('barbican.model.repositories._create_engine')
    def test_should_complete_with_no_alembic_create_default_configs(
            self, mock_create_engine):

        repositories.CONF.set_override("db_auto_create", False)
        engine = mock.MagicMock()
        mock_create_engine.return_value = engine

        # Invoke method under test.
        repositories._get_engine(None)

        engine.connect.assert_called_once_with()
        mock_create_engine.assert_called_once_with(
            'connection',
            idle_timeout=3600,
            max_pool_size=repositories.CONF.sql_pool_size,
            max_overflow=repositories.CONF.sql_pool_max_overflow
        )

    @mock.patch('barbican.model.repositories._create_engine')
    def test_should_complete_with_no_alembic_create_pool_configs(
            self, mock_create_engine):

        repositories.CONF.set_override("db_auto_create", False)
        repositories.CONF.set_override(
            "sql_pool_class", "QueuePool")
        repositories.CONF.set_override("sql_pool_size", 22)
        repositories.CONF.set_override("sql_pool_max_overflow", 11)

        engine = mock.MagicMock()
        mock_create_engine.return_value = engine

        # Invoke method under test.
        repositories._get_engine(None)

        engine.connect.assert_called_once_with()
        mock_create_engine.assert_called_once_with(
            'connection',
            idle_timeout=3600,
            max_pool_size=22,
            max_overflow=11
        )


class WhenTestingAutoGenerateTables(utils.BaseTestCase):

    @mock.patch('barbican.model.migration.commands.upgrade')
    def test_should_complete_with_alembic_database_update(
            self, mock_commands_upgrade):

        tables = dict(
            alembic_version='version')  # Mimic tables already created.
        engine = 'engine'

        # Invoke method under test.
        repositories._auto_generate_tables(engine, tables)

        mock_commands_upgrade.assert_called_once_with()


class WhenTestingIsDbConnectionError(utils.BaseTestCase):

    def test_should_return_false_no_error_code_in_args(self):

        args = mock.MagicMock()
        args.find.return_value = -1

        result = repositories.is_db_connection_error(args)

        self.assertFalse(result)

    def test_should_return_true_error_code_found_in_args(self):

        args = mock.MagicMock()
        args.find.return_value = 1

        result = repositories.is_db_connection_error(args)

        self.assertTrue(result)


class WhenTestingMigrations(utils.BaseTestCase):

    def setUp(self):
        super(WhenTestingMigrations, self).setUp()
        repositories.CONF.set_override("sql_connection", "connection")
        self.alembic_config = migration.init_config()
        self.alembic_config.barbican_config = cfg.CONF

    def test_no_downgrade(self):
        script_dir = alembic_script.ScriptDirectory.from_config(
            self.alembic_config)
        versions = [v for v in script_dir.walk_revisions(base='base',
                                                         head='heads')]
        failed_revisions = []
        for version in versions:
            if hasattr(version.module, 'downgrade'):
                failed_revisions.append(version.revision)

        if failed_revisions:
            self.fail('Migrations %s have downgrade' % failed_revisions)


class DummyRepo(repositories.BaseRepo):
    """Repository for the increasing code coverage of unit tests."""
    def get_session(self, session=None):
        return None

    def _do_entity_name(self):
        return "Dummy"

    def _do_build_get_query(self, entity_id, external_project_id, session):
        return None

    def _do_validate(self, values):
        pass

    def _build_get_project_entities_query(self, project_id, session):
        return None


class WhenIncreasingRepositoryTestCoverage(utils.BaseTestCase):

    def test_get_count_should_return_zero(self):
        dummy_repo = DummyRepo()
        count = dummy_repo.get_count('dummy_project_id')
        self.assertEqual(0, count)

    def test_get_project_entities_should_return_empty(self):
        dummy_repo = DummyRepo()
        count = dummy_repo.get_project_entities('dummy_project_id')
        self.assertEqual([], count)
