# Copyright 2012 Cloudscaling Group, 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 collections

from oslotest import base as oslo_test
from sqlalchemy import Column
from sqlalchemy import Integer, String
from sqlalchemy.ext.declarative import declarative_base

from oslo_db.sqlalchemy import models
from oslo_db.sqlalchemy import test_base


BASE = declarative_base()


class ModelBaseTest(test_base.DbTestCase):
    def setUp(self):
        super(ModelBaseTest, self).setUp()
        self.mb = models.ModelBase()
        self.ekm = ExtraKeysModel()

    def test_modelbase_has_dict_methods(self):
        dict_methods = ('__getitem__',
                        '__setitem__',
                        '__contains__',
                        'get',
                        'update',
                        'save',
                        'items',
                        'iteritems',
                        'keys')
        for method in dict_methods:
            self.assertTrue(hasattr(models.ModelBase, method),
                            "Method %s() is not found" % method)

    def test_modelbase_is_iterable(self):
        self.assertTrue(issubclass(models.ModelBase, collections.Iterable))

    def test_modelbase_set(self):
        self.mb['world'] = 'hello'
        self.assertEqual(self.mb['world'], 'hello')

    def test_modelbase_update(self):
        h = {'a': '1', 'b': '2'}
        self.mb.update(h)
        for key in h.keys():
            self.assertEqual(self.mb[key], h[key])

    def test_modelbase_contains(self):
        mb = models.ModelBase()
        h = {'a': '1', 'b': '2'}
        mb.update(h)
        for key in h.keys():
            # Test 'in' syntax (instead of using .assertIn)
            self.assertTrue(key in mb)

        self.assertFalse('non-existent-key' in mb)

    def test_modelbase_contains_exc(self):
        class ErrorModel(models.ModelBase):
            @property
            def bug(self):
                raise ValueError

        model = ErrorModel()
        model.update({'attr': 5})

        self.assertTrue('attr' in model)
        self.assertRaises(ValueError, lambda: 'bug' in model)

    def test_modelbase_items_iteritems(self):
        h = {'a': '1', 'b': '2'}
        expected = {
            'id': None,
            'smth': None,
            'name': 'NAME',
            'a': '1',
            'b': '2',
        }
        self.ekm.update(h)
        self.assertEqual(dict(self.ekm.items()), expected)
        self.assertEqual(dict(self.ekm.iteritems()), expected)

    def test_modelbase_dict(self):
        h = {'a': '1', 'b': '2'}
        expected = {
            'id': None,
            'smth': None,
            'name': 'NAME',
            'a': '1',
            'b': '2',
        }
        self.ekm.update(h)
        self.assertEqual(dict(self.ekm), expected)

    def test_modelbase_iter(self):
        expected = {
            'id': None,
            'smth': None,
            'name': 'NAME',
        }
        i = iter(self.ekm)
        found_items = 0
        while True:
            r = next(i, None)
            if r is None:
                break
            self.assertEqual(expected[r[0]], r[1])
            found_items += 1

        self.assertEqual(len(expected), found_items)

    def test_modelbase_keys(self):
        self.assertEqual(set(self.ekm.keys()),
                         set(('id', 'smth', 'name')))

        self.ekm.update({'a': '1', 'b': '2'})
        self.assertEqual(set(self.ekm.keys()),
                         set(('a', 'b', 'id', 'smth', 'name')))

    def test_modelbase_several_iters(self):
        mb = ExtraKeysModel()
        it1 = iter(mb)
        it2 = iter(mb)

        self.assertFalse(it1 is it2)
        self.assertEqual(dict(it1), dict(mb))
        self.assertEqual(dict(it2), dict(mb))

    def test_extra_keys_empty(self):
        """Test verifies that by default extra_keys return empty list."""
        self.assertEqual(self.mb._extra_keys, [])

    def test_extra_keys_defined(self):
        """Property _extra_keys will return list with attributes names."""
        self.assertEqual(self.ekm._extra_keys, ['name'])

    def test_model_with_extra_keys(self):
        data = dict(self.ekm)
        self.assertEqual(data, {'smth': None,
                                'id': None,
                                'name': 'NAME'})


class ExtraKeysModel(BASE, models.ModelBase):
    __tablename__ = 'test_model'

    id = Column(Integer, primary_key=True)
    smth = Column(String(255))

    @property
    def name(self):
        return 'NAME'

    @property
    def _extra_keys(self):
        return ['name']


class TimestampMixinTest(oslo_test.BaseTestCase):

    def test_timestampmixin_attr(self):
        methods = ('created_at',
                   'updated_at')
        for method in methods:
            self.assertTrue(hasattr(models.TimestampMixin, method),
                            "Method %s() is not found" % method)