# Copyright (c) 2015 Orange.
# 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 copy
from unittest import mock

from oslo_utils import uuidutils

from networking_bagpipe.agent import bagpipe_bgp_agent
from networking_bagpipe.agent.bgpvpn import constants as bgpvpn_const
from networking_bagpipe.bagpipe_bgp import constants as bbgp_const

from neutron.plugins.ml2.drivers.openvswitch.agent \
    import ovs_agent_extension_api as ovs_ext_agt
from neutron.plugins.ml2.drivers.openvswitch.agent import vlanmanager

from neutron.tests.unit.plugins.ml2.drivers.openvswitch.agent \
    import ovs_test_base

from neutron_lib.plugins.ml2 import ovs_constants as ovs_agt_constants


PORT10_ID = uuidutils.generate_uuid()
PORT10 = {'id': PORT10_ID,
          'mac_address': '00:00:de:ad:be:ef',
          'ip_address': '10.0.0.2'}

PORT11 = {'id': uuidutils.generate_uuid(),
          'mac_address': '00:00:de:ad:f0:0d',
          'ip_address': '10.0.0.3'}

NETWORK1 = {'id': uuidutils.generate_uuid(),
            'gateway_ip': '10.0.0.1',
            'segmentation_id': '101'}

PORT20 = {'id': uuidutils.generate_uuid(),
          'mac_address': '00:00:de:ad:be:ef',
          'ip_address': '20.0.0.2'}

PORT21 = {'id': uuidutils.generate_uuid(),
          'mac_address': '00:00:de:ad:f0:0d',
          'ip_address': '20.0.0.3'}

NETWORK2 = {'id': uuidutils.generate_uuid(),
            'gateway_ip': '20.0.0.1',
            'segmentation_id': '202'}

ROUTER1 = {'id': uuidutils.generate_uuid()}

port_2_net = {
    PORT10['id']: NETWORK1,
    PORT11['id']: NETWORK1,
    PORT20['id']: NETWORK2,
    PORT21['id']: NETWORK2,
}

LOCAL_VLAN_MAP = {
    NETWORK1['id']: [31, NETWORK1['segmentation_id']],
    NETWORK2['id']: [52, NETWORK2['segmentation_id']]
}

BGPVPN_L2_RT10 = {'route_targets': ['BGPVPN_L2:10'],
                  'import_targets': [],
                  'export_targets': []
                  }

BGPVPN_L2_RT20 = {'route_targets': ['BGPVPN_L2:20'],
                  'import_targets': [],
                  'export_targets': []
                  }

BGPVPN_L3_RT100 = {'route_targets': ['BGPVPN_L3:100'],
                   'import_targets': [],
                   'export_targets': []
                   }

BGPVPN_L3_RT200 = {'route_targets': ['BGPVPN_L3:200'],
                   'import_targets': [],
                   'export_targets': []
                   }


class DummyPort:
    def __init__(self, network, port, bgpvpn_port=False,
                 evpn=None, ipvpn=None):
        self.id = port['id']
        self.network_id = network['id']
        self.mac_address = port['mac_address']
        self.ip_address = port['ip_address']
        self.gateway_ip = network['gateway_ip']

        if bgpvpn_port:
            if evpn:
                self.l2vpn = copy.deepcopy(evpn)

            if ipvpn:
                self.l3vpn = copy.deepcopy(ipvpn)
        else:
            if evpn:
                self.evpn = copy.deepcopy(evpn)

            if ipvpn:
                self.ipvpn = copy.deepcopy(ipvpn)


class DummyVif:
    def __init__(self, ofport, port_name):
        self.ofport = ofport
        self.port_name = port_name


class DummyBGPVPN:
    def __init__(self, network, l2vpn=None, l3vpn=None, gateway_mac=None):
        self.id = uuidutils.generate_uuid()
        self.network_id = network['id']

        if l2vpn:
            self.l2vpn = copy.deepcopy(l2vpn)

        if l3vpn:
            self.l3vpn = copy.deepcopy(l3vpn)

        if gateway_mac:
            self.gateway_mac = gateway_mac


class RTList(list):

    def __eq__(self, other):
        return set(self) == set(other)


class BaseTestAgentExtension:

    agent_extension_class = None

    DUMMY_VIF10 = None
    DUMMY_VIF11 = None
    DUMMY_VIF20 = None
    DUMMY_VIF21 = None

    def setUp(self):
        self.mocked_bagpipe_agent = mock.Mock(
            spec=bagpipe_bgp_agent.BaGPipeBGPAgent
        )
        self.mocked_bagpipe_agent.do_port_plug = mock.Mock()
        self.mocked_bagpipe_agent.do_port_plug_refresh = mock.Mock()

        patcher = mock.patch('networking_bagpipe.agent.bagpipe_bgp_agent.'
                             'BaGPipeBGPAgent.get_instance',
                             return_value=self.mocked_bagpipe_agent)
        patcher.start()
        self.addCleanup(patcher.stop)

        self.agent_ext = self.agent_extension_class()
        self.connection = mock.Mock()

    def _port_data(self, port, delete=False, admin_state_up=True):
        data = {
            'port_id': port['id']
        }
        if not delete:
            data.update({
                'port_id': port['id'],
                'admin_state_up': admin_state_up,
                'network_id': port_2_net[port['id']]['id'],
                'segmentation_id': port_2_net[port['id']]['segmentation_id'],
                'network_type': 'vxlan',
                'device_owner': 'compute:None',
                'mac_address': port['mac_address'],
                'fixed_ips': [
                    {
                        'ip_address': port['ip_address'],
                    }
                ]
            })
        return data

    def _get_expected_local_port(self, bbgp_vpn_type, network_id,
                                 segmentation_id, port_id, detach=False):
        raise NotImplementedError

    def _check_network_info(self, network_id, expected_size,
                            vpn_type=None, vpn_rts=None):
        if expected_size == 0:
            self.assertNotIn(network_id, self.agent_ext.networks_info,
                             "Network %s expected to have no ports left"
                             % network_id)
        else:
            self.assertIn(network_id, self.agent_ext.networks_info)
            network_info = self.agent_ext.networks_info[network_id]
            self.assertEqual(len(network_info.ports), expected_size,
                             "Network ports size not as expected")


PATCH_INT_TO_MPLS = 5
PATCH_INT_TO_TUN = 7
PATCH_TUN_TO_MPLS = 1
PATCH_TUN_TO_INT = 4
PATCH_MPLS_TO_TUN = 2
PATCH_MPLS_TO_INT = 6

BR_INT_PATCHES = {
    'patch-tun': PATCH_INT_TO_TUN,
    'patch-int-from-mpls': PATCH_INT_TO_MPLS
}

BR_TUN_PATCHES = {
    'patch-int': PATCH_TUN_TO_INT,
    'patch-to-mpls': PATCH_TUN_TO_MPLS
}

BR_MPLS_PATCHES = {
    'patch-from-tun': PATCH_MPLS_TO_TUN,
    'patch-mpls-to-int': PATCH_MPLS_TO_INT
}


def get_port_ofport_tun_br(port_name):
    return BR_TUN_PATCHES[port_name]


def get_port_ofport_int_br(port_name):
    return BR_INT_PATCHES[port_name]


def add_patch_port_mpls(patch, peer):
    return BR_MPLS_PATCHES[patch]


def add_patch_port_tun(patch, peer):
    return BR_TUN_PATCHES[patch]


def add_patch_port_int(patch, peer):
    return BR_INT_PATCHES[patch]


class BaseTestOVSAgentExtension(ovs_test_base.OVSOSKenTestBase,
                                BaseTestAgentExtension):

    driver_type = ovs_agt_constants.EXTENSION_DRIVER_TYPE

    DUMMY_VIF10 = DummyVif(10, 'VIF10')
    DUMMY_VIF11 = DummyVif(11, 'VIF11')
    DUMMY_VIF20 = DummyVif(20, 'VIF20')
    DUMMY_VIF21 = DummyVif(21, 'VIF21')

    def setUp(self):
        ovs_test_base.OVSOSKenTestBase.setUp(self)
        BaseTestAgentExtension.setUp(self)

        self.int_br = self.br_int_cls("br-int")
        self.int_br.add_patch_port = mock.Mock(
            side_effect=add_patch_port_int)
        self.int_br.get_port_ofport = mock.Mock(
            side_effect=get_port_ofport_int_br)
        self.int_br.add_flow = mock.Mock()
        self.int_br.delete_flows = mock.Mock()
        self.int_br.use_at_least_protocol = mock.Mock()

        self.tun_br = self.br_tun_cls("br-tun")
        self.tun_br.add_patch_port = mock.Mock(
            side_effect=add_patch_port_tun)
        self.tun_br.get_port_ofport = mock.Mock(
            side_effect=get_port_ofport_tun_br)
        self.tun_br.add_flow = mock.Mock()
        self.tun_br.delete_flows = mock.Mock()

        agent_extension_api = ovs_ext_agt.OVSAgentExtensionAPI(self.int_br,
                                                               self.tun_br)
        self.agent_ext.consume_api(agent_extension_api)

        br_exists_patcher = mock.patch(
            'neutron.agent.common.ovs_lib.OVSBridge.bridge_exists',
            return_value=True)
        br_exists_patcher.start()
        self.addCleanup(br_exists_patcher.stop)

        add_patch_patcher = mock.patch('neutron.agent.common.ovs_lib.OVSBridge'
                                       '.add_patch_port',
                                       side_effect=add_patch_port_mpls)
        add_patch_patcher.start()
        self.addCleanup(add_patch_patcher.stop)
        secure_mode_patcher = mock.patch(
            'neutron.agent.common.ovs_lib.OVSBridge.set_secure_mode')
        secure_mode_patcher.start()
        self.addCleanup(secure_mode_patcher.stop)

        self.agent_ext.initialize(self.connection,
                                  ovs_agt_constants.EXTENSION_DRIVER_TYPE)

        self.vlan_manager = vlanmanager.LocalVlanManager()
        for net_id, vlan in LOCAL_VLAN_MAP.items():
            try:
                self.vlan_manager.add(net_id, vlan[0], None, None,
                                      segmentation_id=vlan[1])
            except vlanmanager.MappingAlreadyExists:
                pass

    def _get_expected_local_port(self, bbgp_vpn_type, network_id,
                                 segmentation_id, port_id, detach=False):
        vlan = self.vlan_manager.get(network_id, segmentation_id).vlan
        if bbgp_vpn_type == bbgp_const.IPVPN:
            r = dict(
                local_port=dict(
                    linuxif='{}:{}'.format(bgpvpn_const.LINUXIF_PREFIX, vlan),
                    ovs=dict(plugged=True,
                             port_number=PATCH_MPLS_TO_TUN,
                             vlan=vlan)
                )
            )
            if detach:
                del r['local_port']['ovs']
            return r
        else:
            r = dict(
                local_port=dict(
                    linuxif='{}:{}'.format(bgpvpn_const.LINUXIF_PREFIX, vlan),
                    vlan=vlan
                )
            )
            if detach:
                del r['local_port']['vlan']
            return r
