# Copyright 2016 Huawei corp.
# 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 abc

from neutron.api.v2 import resource_helper
from neutron_lib.api import extensions

from wan_qos.common import constants

RESOURCE_ATTRIBUTE_MAP = {
    constants.WAN_TC_DEVICE_PATH: {
        'id': {'allow_post': False, 'allow_put': False,
               'is_visible': True},
        'host': {'allow_post': True, 'allow_put': False,
                 'validate': {'type:string': None},
                 'is_visible': True, 'default': ''},
        'lan_port': {'allow_post': True, 'allow_put': False,
                     'validate': {'type:string': None},
                     'is_visible': True, 'default': ''},
        'wan_port': {'allow_post': True, 'allow_put': False,
                     'validate': {'type:string': None},
                     'is_visible': True},
        'uptime': {'allow_post': True, 'allow_put': False,
                   'validate': {'type:string': None},
                   'is_visible': True},
        'last_seen': {'allow_post': True, 'allow_put': False,
                      'validate': {'type:string': None},
                      'is_visible': True}
    },
}


class Wantcdevice(extensions.ExtensionDescriptor):
    @classmethod
    def get_name(cls):
        return "WAN Traffic Control device"

    @classmethod
    def get_alias(cls):
        return "wan-tc-device"

    @classmethod
    def get_description(cls):
        return "Device for limiting traffic on WAN links"

    @classmethod
    def get_updated(cls):
        return "2017-01-15T00:00:00-00:00"

    @classmethod
    def get_resources(cls):
        """Returns Ext Resources."""

        mem_actions = {}
        plural_mappings = resource_helper.build_plural_mappings(
            {}, RESOURCE_ATTRIBUTE_MAP)
        resources = resource_helper.build_resource_info(plural_mappings,
                                                        RESOURCE_ATTRIBUTE_MAP,
                                                        constants.WANTC,
                                                        action_map=mem_actions,
                                                        register_quota=True,
                                                        translate_name=True)

        return resources

    def get_extended_resources(self, version):
        if version == "2.0":
            return RESOURCE_ATTRIBUTE_MAP
        else:
            return {}


class WanTcDevicePluginBase(object):
    @abc.abstractmethod
    def get_wan_tc_device(self, context, id, fields=None):
        pass

    @abc.abstractmethod
    def get_wan_tc_devices(self, context, filters=None, fields=None,
                           sorts=None, limit=None, marker=None,
                           page_reverse=False):
        pass

    @abc.abstractmethod
    def delete_wan_tc_device(self, context, id):
        pass