# Copyright 2018 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
import traceback

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

from lcm.ns.biz.ns_create import CreateNSService
from lcm.ns.biz.ns_get import GetNSInfoService
from lcm.ns.serializers.create_ns_serializers import CreateNsReqSerializer, CreateNsRespSerializer
from lcm.ns.serializers.pub_serializers import QueryNsRespSerializer
from lcm.pub.exceptions import NSLCMException
from lcm.pub.utils.values import ignore_case_get

logger = logging.getLogger(__name__)


class CreateNSView(APIView):
    @swagger_auto_schema(
        request_body=None,
        responses={
            status.HTTP_200_OK: QueryNsRespSerializer(help_text="NS instances", many=True),
            status.HTTP_500_INTERNAL_SERVER_ERROR: "Inner error"
        }
    )
    def get(self, request):
        try:
            logger.debug("CreateNSView::get")
            ret = GetNSInfoService().get_ns_info()
            logger.debug("CreateNSView::get::ret=%s", ret)
            resp_serializer = QueryNsRespSerializer(data=ret, many=True)
            if not resp_serializer.is_valid():
                raise NSLCMException(resp_serializer.errors)
            return Response(data=resp_serializer.data, status=status.HTTP_200_OK)
        except Exception as e:
            logger.error(traceback.format_exc())
            logger.error("Exception in GetNS: %s", e.message)
            return Response(data={'error': e.message}, status=status.HTTP_500_INTERNAL_SERVER_ERROR)

    @swagger_auto_schema(
        request_body=CreateNsReqSerializer(),
        responses={
            status.HTTP_201_CREATED: CreateNsRespSerializer(),
            status.HTTP_500_INTERNAL_SERVER_ERROR: "Inner error"
        }
    )
    def post(self, request):
        logger.debug("Enter CreateNS: %s", request.data)
        try:
            req_serializer = CreateNsReqSerializer(data=request.data)
            if not req_serializer.is_valid():
                raise NSLCMException(req_serializer.errors)

            if ignore_case_get(request.data, 'test') == "test":
                return Response(data={'nsInstanceId': "test"}, status=status.HTTP_201_CREATED)
            csar_id = ignore_case_get(request.data, 'csarId')
            ns_name = ignore_case_get(request.data, 'nsName')
            description = ignore_case_get(request.data, 'description')
            context = ignore_case_get(request.data, 'context')
            ns_inst_id = CreateNSService(csar_id, ns_name, description, context).do_biz()

            logger.debug("CreateNSView::post::ret={'nsInstanceId':%s}", ns_inst_id)
            resp_serializer = CreateNsRespSerializer(
                data={'nsInstanceId': ns_inst_id,
                      'nsInstanceName': 'nsInstanceName',
                      'nsInstanceDescription': 'nsInstanceDescription',
                      'nsdId': 123,
                      'nsdInfoId': 456,
                      'nsState': 'NOT_INSTANTIATED',
                      '_links': {'self': {'href': 'href'}}})
            if not resp_serializer.is_valid():
                raise NSLCMException(resp_serializer.errors)
            return Response(data=resp_serializer.data, status=status.HTTP_201_CREATED)
        except Exception as e:
            logger.error(traceback.format_exc())
            logger.error("Exception in CreateNS: %s", e.message)
            return Response(data={'error': e.message}, status=status.HTTP_500_INTERNAL_SERVER_ERROR)