# Copyright 2017 ZTE Corporation.
#
# 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 logging

from drf_yasg.utils import swagger_auto_schema
from rest_framework import status
from rest_framework.response import Response
from rest_framework.views import APIView

from res.pub.exceptions import VNFRESException
from res.pub.database.models import StorageInstModel
from res.pub.database.models import SubNetworkInstModel
from res.pub.database.models import CPInstModel
from res.resources.serializers import VolumeInfoSerializer
from res.resources.serializers import CpsInfoSerializer
from res.resources.serializers import SubnetInfoSerializer
from res.resources.views.base_view import view_safe_call_with_log

logger = logging.getLogger(__name__)


def query_resources(res_type, logger, resources, cvt_fun, res_serializer):
    logger.debug("Enter query %s", res_type)

    resp = {
        'resp_data': [cvt_fun(res) for res in resources]
    }

    resp_serializer = res_serializer(data=resp)
    if not resp_serializer.is_valid():
        raise VNFRESException(resp_serializer.errors)

    return Response(
        data=resp,
        status=status.HTTP_200_OK
    )


class getSubnets(APIView):
    @swagger_auto_schema(
        responses={
            status.HTTP_200_OK: SubnetInfoSerializer(),
            status.HTTP_500_INTERNAL_SERVER_ERROR: 'internal error'
        }
    )
    @view_safe_call_with_log(logger=logger)
    def get(self, request, vnfInstanceId):
        return query_resources(
            res_type="Subnets",
            logger=logger,
            resources=SubNetworkInstModel.objects.filter(instid=vnfInstanceId),
            cvt_fun=fill_subnets_data,
            res_serializer=SubnetInfoSerializer
        )


def fill_subnets_data(subnet):
    subnets_data = {
        "subnetworkid": subnet.subnetworkid,
        "vimid": subnet.vimid,
        "resouceid": subnet.resouceid,
        "networkid": subnet.networkid,
        "insttype": subnet.insttype,
        "instid": subnet.instid,
        "name": subnet.name,
        "cidr": subnet.cidr
    }
    return subnets_data


class getCps(APIView):
    @swagger_auto_schema(
        responses={
            status.HTTP_200_OK: CpsInfoSerializer(),
            status.HTTP_500_INTERNAL_SERVER_ERROR: 'internal error'
        }
    )
    @view_safe_call_with_log(logger=logger)
    def get(self, request, vnfInstanceId):
        return query_resources(
            res_type="Cps",
            logger=logger,
            resources=CPInstModel.objects.filter(ownerid=vnfInstanceId),
            cvt_fun=fill_cps_data,
            res_serializer=CpsInfoSerializer
        )


def fill_cps_data(cp):
    cps_data = {
        "cpinstanceid": cp.cpinstanceid,
        "cpdid": cp.cpdid,
        "cpinstancename": cp.cpinstancename,
        "vlinstanceid": cp.vlinstanceid,
        "ownertype": cp.ownertype,
        "ownerid": cp.ownerid,
        "relatedtype": cp.relatedtype
    }
    return cps_data


class getVolumes(APIView):
    @swagger_auto_schema(
        responses={
            status.HTTP_200_OK: VolumeInfoSerializer(),
            status.HTTP_500_INTERNAL_SERVER_ERROR: 'internal error'
        }
    )
    @view_safe_call_with_log(logger=logger)
    def get(self, request, vnfInstanceId):
        return query_resources(
            res_type="Volumes",
            logger=logger,
            resources=StorageInstModel.objects.filter(instid=vnfInstanceId),
            cvt_fun=fill_volumes_data,
            res_serializer=VolumeInfoSerializer
        )


def fill_volumes_data(v):
    volumes_data = {
        "storageid": v.storageid,
        "vimid": v.vimid,
        "resouceid": v.resouceid,
        "insttype": v.insttype,
        "instid": v.instid,
        "storagetype": v.storagetype,
        "size": v.size
    }
    return volumes_data