import mock
from oslo.config import cfg
import testtools
import webtest

from neutron.api import extensions
from neutron.api.v2 import attributes
from neutron.common import config
from neutron.common import exceptions
from neutron import context
from neutron.db import api as db
from neutron.db import quota_db
from neutron import manager
from neutron.plugins.linuxbridge.db import l2network_db_v2
from neutron import quota
from neutron.tests import base
from neutron.tests.unit import test_api_v2
from neutron.tests.unit import test_extensions
from neutron.tests.unit import testlib_api

TARGET_PLUGIN = ('neutron.plugins.linuxbridge.lb_neutron_plugin'
                 '.LinuxBridgePluginV2')

_get_path = test_api_v2._get_path


class QuotaExtensionTestCase(testlib_api.WebTestCase):

    def setUp(self):
        super(QuotaExtensionTestCase, self).setUp()
        # Ensure 'stale' patched copies of the plugin are never returned
        manager.NeutronManager._instance = None

        # Ensure existing ExtensionManager is not used
        extensions.PluginAwareExtensionManager._instance = None

        # Save the global RESOURCE_ATTRIBUTE_MAP
        self.saved_attr_map = {}
        for resource, attrs in attributes.RESOURCE_ATTRIBUTE_MAP.iteritems():
            self.saved_attr_map[resource] = attrs.copy()

        # Create the default configurations
        args = ['--config-file', test_extensions.etcdir('neutron.conf.test')]
        config.parse(args=args)

        # Update the plugin and extensions path
        cfg.CONF.set_override('core_plugin', TARGET_PLUGIN)
        cfg.CONF.set_override(
            'quota_items',
            ['network', 'subnet', 'port', 'extra1'],
            group='QUOTAS')
        quota.QUOTAS = quota.QuotaEngine()
        quota.register_resources_from_config()
        self._plugin_patcher = mock.patch(TARGET_PLUGIN, autospec=True)
        self.plugin = self._plugin_patcher.start()
        self.plugin.return_value.supported_extension_aliases = ['quotas']
        # QUOTAS will regester the items in conf when starting
        # extra1 here is added later, so have to do it manually
        quota.QUOTAS.register_resource_by_name('extra1')
        ext_mgr = extensions.PluginAwareExtensionManager.get_instance()
        l2network_db_v2.initialize()
        app = config.load_paste_app('extensions_test_app')
        ext_middleware = extensions.ExtensionMiddleware(app, ext_mgr=ext_mgr)
        self.api = webtest.TestApp(ext_middleware)

    def tearDown(self):
        self._plugin_patcher.stop()
        self.api = None
        self.plugin = None
        db.clear_db()
        cfg.CONF.reset()

        # Restore the global RESOURCE_ATTRIBUTE_MAP
        attributes.RESOURCE_ATTRIBUTE_MAP = self.saved_attr_map
        super(QuotaExtensionTestCase, self).tearDown()


class QuotaExtensionDbTestCase(QuotaExtensionTestCase):
    fmt = 'json'

    def setUp(self):
        cfg.CONF.set_override(
            'quota_driver',
            'neutron.db.quota_db.DbQuotaDriver',
            group='QUOTAS')
        super(QuotaExtensionDbTestCase, self).setUp()

    def test_quotas_loaded_right(self):
        res = self.api.get(_get_path('quotas', fmt=self.fmt))
        quota = self.deserialize(res)
        self.assertEqual([], quota['quotas'])
        self.assertEqual(200, res.status_int)

    def test_quotas_default_values(self):
        tenant_id = 'tenant_id1'
        env = {'neutron.context': context.Context('', tenant_id)}
        res = self.api.get(_get_path('quotas', id=tenant_id, fmt=self.fmt),
                           extra_environ=env)
        quota = self.deserialize(res)
        self.assertEqual(10, quota['quota']['network'])
        self.assertEqual(10, quota['quota']['subnet'])
        self.assertEqual(50, quota['quota']['port'])
        self.assertEqual(-1, quota['quota']['extra1'])

    def test_show_quotas_with_admin(self):
        tenant_id = 'tenant_id1'
        env = {'neutron.context': context.Context('', tenant_id + '2',
                                                  is_admin=True)}
        res = self.api.get(_get_path('quotas', id=tenant_id, fmt=self.fmt),
                           extra_environ=env)
        self.assertEqual(200, res.status_int)
        quota = self.deserialize(res)
        self.assertEqual(10, quota['quota']['network'])
        self.assertEqual(10, quota['quota']['subnet'])
        self.assertEqual(50, quota['quota']['port'])

    def test_show_quotas_without_admin_forbidden_returns_403(self):
        tenant_id = 'tenant_id1'
        env = {'neutron.context': context.Context('', tenant_id + '2',
                                                  is_admin=False)}
        res = self.api.get(_get_path('quotas', id=tenant_id, fmt=self.fmt),
                           extra_environ=env, expect_errors=True)
        self.assertEqual(403, res.status_int)

    def test_show_quotas_with_owner_tenant(self):
        tenant_id = 'tenant_id1'
        env = {'neutron.context': context.Context('', tenant_id,
                                                  is_admin=False)}
        res = self.api.get(_get_path('quotas', id=tenant_id, fmt=self.fmt),
                           extra_environ=env)
        self.assertEqual(200, res.status_int)
        quota = self.deserialize(res)
        self.assertEqual(10, quota['quota']['network'])
        self.assertEqual(10, quota['quota']['subnet'])
        self.assertEqual(50, quota['quota']['port'])

    def test_list_quotas_with_admin(self):
        tenant_id = 'tenant_id1'
        env = {'neutron.context': context.Context('', tenant_id,
                                                  is_admin=True)}
        res = self.api.get(_get_path('quotas', fmt=self.fmt),
                           extra_environ=env)
        self.assertEqual(200, res.status_int)
        quota = self.deserialize(res)
        self.assertEqual([], quota['quotas'])

    def test_list_quotas_without_admin_forbidden_returns_403(self):
        tenant_id = 'tenant_id1'
        env = {'neutron.context': context.Context('', tenant_id,
                                                  is_admin=False)}
        res = self.api.get(_get_path('quotas', fmt=self.fmt),
                           extra_environ=env, expect_errors=True)
        self.assertEqual(403, res.status_int)

    def test_update_quotas_without_admin_forbidden_returns_403(self):
        tenant_id = 'tenant_id1'
        env = {'neutron.context': context.Context('', tenant_id,
                                                  is_admin=False)}
        quotas = {'quota': {'network': 100}}
        res = self.api.put(_get_path('quotas', id=tenant_id, fmt=self.fmt),
                           self.serialize(quotas), extra_environ=env,
                           expect_errors=True)
        self.assertEqual(403, res.status_int)

    def test_update_quotas_with_non_integer_returns_400(self):
        tenant_id = 'tenant_id1'
        env = {'neutron.context': context.Context('', tenant_id,
                                                  is_admin=True)}
        quotas = {'quota': {'network': 'abc'}}
        res = self.api.put(_get_path('quotas', id=tenant_id, fmt=self.fmt),
                           self.serialize(quotas), extra_environ=env,
                           expect_errors=True)
        self.assertEqual(400, res.status_int)

    def test_update_quotas_with_negative_integer_returns_400(self):
        tenant_id = 'tenant_id1'
        env = {'neutron.context': context.Context('', tenant_id,
                                                  is_admin=True)}
        quotas = {'quota': {'network': -2}}
        res = self.api.put(_get_path('quotas', id=tenant_id, fmt=self.fmt),
                           self.serialize(quotas), extra_environ=env,
                           expect_errors=True)
        self.assertEqual(400, res.status_int)

    def test_update_quotas_to_unlimited(self):
        tenant_id = 'tenant_id1'
        env = {'neutron.context': context.Context('', tenant_id,
                                                  is_admin=True)}
        quotas = {'quota': {'network': -1}}
        res = self.api.put(_get_path('quotas', id=tenant_id, fmt=self.fmt),
                           self.serialize(quotas), extra_environ=env,
                           expect_errors=False)
        self.assertEqual(200, res.status_int)

    def test_update_quotas_exceeding_current_limit(self):
        tenant_id = 'tenant_id1'
        env = {'neutron.context': context.Context('', tenant_id,
                                                  is_admin=True)}
        quotas = {'quota': {'network': 120}}
        res = self.api.put(_get_path('quotas', id=tenant_id, fmt=self.fmt),
                           self.serialize(quotas), extra_environ=env,
                           expect_errors=False)
        self.assertEqual(200, res.status_int)

    def test_update_quotas_with_non_support_resource_returns_400(self):
        tenant_id = 'tenant_id1'
        env = {'neutron.context': context.Context('', tenant_id,
                                                  is_admin=True)}
        quotas = {'quota': {'abc': 100}}
        res = self.api.put(_get_path('quotas', id=tenant_id, fmt=self.fmt),
                           self.serialize(quotas), extra_environ=env,
                           expect_errors=True)
        self.assertEqual(400, res.status_int)

    def test_update_quotas_with_admin(self):
        tenant_id = 'tenant_id1'
        env = {'neutron.context': context.Context('', tenant_id + '2',
                                                  is_admin=True)}
        quotas = {'quota': {'network': 100}}
        res = self.api.put(_get_path('quotas', id=tenant_id, fmt=self.fmt),
                           self.serialize(quotas), extra_environ=env)
        self.assertEqual(200, res.status_int)
        env2 = {'neutron.context': context.Context('', tenant_id)}
        res = self.api.get(_get_path('quotas', id=tenant_id, fmt=self.fmt),
                           extra_environ=env2)
        quota = self.deserialize(res)
        self.assertEqual(100, quota['quota']['network'])
        self.assertEqual(10, quota['quota']['subnet'])
        self.assertEqual(50, quota['quota']['port'])

    def test_update_attributes(self):
        tenant_id = 'tenant_id1'
        env = {'neutron.context': context.Context('', tenant_id + '2',
                                                  is_admin=True)}
        quotas = {'quota': {'extra1': 100}}
        res = self.api.put(_get_path('quotas', id=tenant_id, fmt=self.fmt),
                           self.serialize(quotas), extra_environ=env)
        self.assertEqual(200, res.status_int)
        env2 = {'neutron.context': context.Context('', tenant_id)}
        res = self.api.get(_get_path('quotas', id=tenant_id, fmt=self.fmt),
                           extra_environ=env2)
        quota = self.deserialize(res)
        self.assertEqual(100, quota['quota']['extra1'])

    def test_delete_quotas_with_admin(self):
        tenant_id = 'tenant_id1'
        env = {'neutron.context': context.Context('', tenant_id + '2',
                                                  is_admin=True)}
        res = self.api.delete(_get_path('quotas', id=tenant_id, fmt=self.fmt),
                              extra_environ=env)
        self.assertEqual(204, res.status_int)

    def test_delete_quotas_without_admin_forbidden_returns_403(self):
        tenant_id = 'tenant_id1'
        env = {'neutron.context': context.Context('', tenant_id,
                                                  is_admin=False)}
        res = self.api.delete(_get_path('quotas', id=tenant_id, fmt=self.fmt),
                              extra_environ=env, expect_errors=True)
        self.assertEqual(403, res.status_int)

    def test_quotas_loaded_bad_returns_404(self):
        try:
            res = self.api.get(_get_path('quotas'), expect_errors=True)
            self.assertEqual(404, res.status_int)
        except Exception:
            pass

    def test_quotas_limit_check(self):
        tenant_id = 'tenant_id1'
        env = {'neutron.context': context.Context('', tenant_id,
                                                  is_admin=True)}
        quotas = {'quota': {'network': 5}}
        res = self.api.put(_get_path('quotas', id=tenant_id,
                                     fmt=self.fmt),
                           self.serialize(quotas), extra_environ=env)
        self.assertEqual(200, res.status_int)
        quota.QUOTAS.limit_check(context.Context('', tenant_id),
                                 tenant_id,
                                 network=4)

    def test_quotas_limit_check_with_invalid_quota_value(self):
        tenant_id = 'tenant_id1'
        with testtools.ExpectedException(exceptions.InvalidQuotaValue):
            quota.QUOTAS.limit_check(context.Context('', tenant_id),
                                     tenant_id,
                                     network=-2)

    def test_quotas_get_tenant_from_request_context(self):
        tenant_id = 'tenant_id1'
        env = {'neutron.context': context.Context('', tenant_id,
                                                  is_admin=True)}
        res = self.api.get(_get_path('quotas/tenant', fmt=self.fmt),
                           extra_environ=env)
        self.assertEqual(200, res.status_int)
        quota = self.deserialize(res)
        self.assertEqual(quota['tenant']['tenant_id'], tenant_id)

    def test_quotas_get_tenant_from_empty_request_context_returns_400(self):
        env = {'neutron.context': context.Context('', '',
                                                  is_admin=True)}
        res = self.api.get(_get_path('quotas/tenant', fmt=self.fmt),
                           extra_environ=env, expect_errors=True)
        self.assertEqual(400, res.status_int)


class QuotaExtensionDbTestCaseXML(QuotaExtensionDbTestCase):
    fmt = 'xml'


class QuotaExtensionCfgTestCase(QuotaExtensionTestCase):
    fmt = 'json'

    def test_quotas_default_values(self):
        tenant_id = 'tenant_id1'
        env = {'neutron.context': context.Context('', tenant_id)}
        res = self.api.get(_get_path('quotas', id=tenant_id, fmt=self.fmt),
                           extra_environ=env)
        quota = self.deserialize(res)
        self.assertEqual(10, quota['quota']['network'])
        self.assertEqual(10, quota['quota']['subnet'])
        self.assertEqual(50, quota['quota']['port'])
        self.assertEqual(-1, quota['quota']['extra1'])

    def test_show_quotas_with_admin(self):
        tenant_id = 'tenant_id1'
        env = {'neutron.context': context.Context('', tenant_id + '2',
                                                  is_admin=True)}
        res = self.api.get(_get_path('quotas', id=tenant_id, fmt=self.fmt),
                           extra_environ=env)
        self.assertEqual(200, res.status_int)

    def test_show_quotas_without_admin_forbidden(self):
        tenant_id = 'tenant_id1'
        env = {'neutron.context': context.Context('', tenant_id + '2',
                                                  is_admin=False)}
        res = self.api.get(_get_path('quotas', id=tenant_id, fmt=self.fmt),
                           extra_environ=env, expect_errors=True)
        self.assertEqual(403, res.status_int)

    def test_update_quotas_forbidden(self):
        tenant_id = 'tenant_id1'
        quotas = {'quota': {'network': 100}}
        res = self.api.put(_get_path('quotas', id=tenant_id, fmt=self.fmt),
                           self.serialize(quotas),
                           expect_errors=True)
        self.assertEqual(403, res.status_int)

    def test_delete_quotas_forbidden(self):
        tenant_id = 'tenant_id1'
        env = {'neutron.context': context.Context('', tenant_id,
                                                  is_admin=False)}
        res = self.api.delete(_get_path('quotas', id=tenant_id, fmt=self.fmt),
                              extra_environ=env, expect_errors=True)
        self.assertEqual(403, res.status_int)


class QuotaExtensionCfgTestCaseXML(QuotaExtensionCfgTestCase):
    fmt = 'xml'


class TestDbQuotaDriver(base.BaseTestCase):
    """Test for neutron.db.quota_db.DbQuotaDriver."""

    def test_get_tenant_quotas_arg(self):
        """Call neutron.db.quota_db.DbQuotaDriver._get_quotas."""

        driver = quota_db.DbQuotaDriver()
        ctx = context.Context('', 'bar')

        foo_quotas = {'network': 5}
        default_quotas = {'network': 10}
        target_tenant = 'foo'

        with mock.patch.object(quota_db.DbQuotaDriver,
                               'get_tenant_quotas',
                               return_value=foo_quotas) as get_tenant_quotas:

            quotas = driver._get_quotas(ctx,
                                        target_tenant,
                                        default_quotas,
                                        ['network'])

            self.assertEqual(quotas, foo_quotas)
            get_tenant_quotas.assert_called_once_with(ctx,
                                                      default_quotas,
                                                      target_tenant)