# Copyright 2014 Big Switch Networks, 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 contextlib
import functools

import mock
import webob.exc

from neutron import context as neutron_context
from neutron.extensions import portbindings
from neutron import manager
from neutron.openstack.common import jsonutils
from neutron.plugins.bigswitch import servermanager
from neutron.plugins.ml2 import config as ml2_config
from neutron.plugins.ml2.drivers.mech_bigswitch import driver as bsn_driver
from neutron.plugins.ml2.drivers import type_vlan as vlan_config
import neutron.tests.unit.bigswitch.test_restproxy_plugin as trp
from neutron.tests.unit.ml2 import test_ml2_plugin
from neutron.tests.unit import test_db_plugin

PHYS_NET = 'physnet1'
VLAN_START = 1000
VLAN_END = 1100
SERVER_POOL = 'neutron.plugins.bigswitch.servermanager.ServerPool'
DRIVER_MOD = 'neutron.plugins.ml2.drivers.mech_bigswitch.driver'
DRIVER = DRIVER_MOD + '.BigSwitchMechanismDriver'


class TestBigSwitchMechDriverBase(trp.BigSwitchProxyPluginV2TestCase):

    def setUp(self):
        # Configure the ML2 mechanism drivers and network types
        ml2_opts = {
            'mechanism_drivers': ['bigswitch'],
            'tenant_network_types': ['vlan'],
        }
        for opt, val in ml2_opts.items():
                ml2_config.cfg.CONF.set_override(opt, val, 'ml2')

        # Configure the ML2 VLAN parameters
        phys_vrange = ':'.join([PHYS_NET, str(VLAN_START), str(VLAN_END)])
        vlan_config.cfg.CONF.set_override('network_vlan_ranges',
                                          [phys_vrange],
                                          'ml2_type_vlan')
        super(TestBigSwitchMechDriverBase,
              self).setUp(test_ml2_plugin.PLUGIN_NAME)


class TestBigSwitchMechDriverNetworksV2(test_db_plugin.TestNetworksV2,
                                        TestBigSwitchMechDriverBase):
    pass


class TestBigSwitchMechDriverPortsV2(test_db_plugin.TestPortsV2,
                                     TestBigSwitchMechDriverBase):

    VIF_TYPE = portbindings.VIF_TYPE_OVS

    def setUp(self):
        super(TestBigSwitchMechDriverPortsV2, self).setUp()
        self.port_create_status = 'DOWN'

    def test_update_port_status_build(self):
        with self.port() as port:
            self.assertEqual(port['port']['status'], 'DOWN')
            self.assertEqual(self.port_create_status, 'DOWN')

    def _make_port(self, fmt, net_id, expected_res_status=None, arg_list=None,
                   **kwargs):
        arg_list = arg_list or ()
        arg_list += ('binding:host_id', )
        res = self._create_port(fmt, net_id, expected_res_status,
                                arg_list, **kwargs)
        # Things can go wrong - raise HTTP exc with res code only
        # so it can be caught by unit tests
        if res.status_int >= 400:
            raise webob.exc.HTTPClientError(code=res.status_int)
        return self.deserialize(fmt, res)

    def test_bind_ivs_port(self):
        host_arg = {portbindings.HOST_ID: 'hostname'}
        with contextlib.nested(
            mock.patch(SERVER_POOL + '.rest_get_switch', return_value=True),
            self.port(arg_list=(portbindings.HOST_ID,), **host_arg)
        ) as (rmock, port):
            rmock.assert_called_once_with('hostname')
            p = port['port']
            self.assertEqual('ACTIVE', p['status'])
            self.assertEqual('hostname', p[portbindings.HOST_ID])
            self.assertEqual(portbindings.VIF_TYPE_IVS,
                             p[portbindings.VIF_TYPE])

    def test_dont_bind_non_ivs_port(self):
        host_arg = {portbindings.HOST_ID: 'hostname'}
        with contextlib.nested(
            mock.patch(SERVER_POOL + '.rest_get_switch',
                       side_effect=servermanager.RemoteRestError(
                           reason='No such switch', status=404)),
            self.port(arg_list=(portbindings.HOST_ID,), **host_arg)
        ) as (rmock, port):
            rmock.assert_called_once_with('hostname')
            p = port['port']
            self.assertNotEqual(portbindings.VIF_TYPE_IVS,
                                p[portbindings.VIF_TYPE])

    def test_bind_port_cache(self):
        with contextlib.nested(
            self.subnet(),
            mock.patch(SERVER_POOL + '.rest_get_switch', return_value=True)
        ) as (sub, rmock):
            makeport = functools.partial(self.port, **{
                'subnet': sub, 'arg_list': (portbindings.HOST_ID,),
                portbindings.HOST_ID: 'hostname'})

            with contextlib.nested(makeport(), makeport(),
                                   makeport()) as ports:
                # response from first should be cached
                rmock.assert_called_once_with('hostname')
                for port in ports:
                    self.assertEqual(portbindings.VIF_TYPE_IVS,
                                     port['port'][portbindings.VIF_TYPE])
            rmock.reset_mock()
            # expired cache should result in new calls
            mock.patch(DRIVER_MOD + '.CACHE_VSWITCH_TIME', new=0).start()
            with contextlib.nested(makeport(), makeport(),
                                   makeport()) as ports:
                self.assertEqual(3, rmock.call_count)
                for port in ports:
                    self.assertEqual(portbindings.VIF_TYPE_IVS,
                                     port['port'][portbindings.VIF_TYPE])

    def test_create404_triggers_background_sync(self):
        # allow the async background thread to run for this test
        self.spawn_p.stop()
        with contextlib.nested(
            mock.patch(SERVER_POOL + '.rest_create_port',
                       side_effect=servermanager.RemoteRestError(
                           reason=servermanager.NXNETWORK, status=404)),
            mock.patch(DRIVER + '._send_all_data'),
            self.port(**{'device_id': 'devid', 'binding:host_id': 'host'})
        ) as (mock_http, mock_send_all, p):
            # wait for thread to finish
            mm = manager.NeutronManager.get_plugin().mechanism_manager
            bigdriver = mm.mech_drivers['bigswitch'].obj
            bigdriver.evpool.waitall()
            mock_send_all.assert_has_calls([
                mock.call(
                    send_routers=False, send_ports=True,
                    send_floating_ips=False,
                    triggered_by_tenant=p['port']['tenant_id']
                )
            ])
        self.spawn_p.start()

    def test_udpate404_triggers_background_sync(self):
        with contextlib.nested(