# 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 lcm.nf.biz.terminate_vnf import TerminateVnf
from lcm.nf.serializers.terminate_vnf_req import TerminateVnfRequestSerializer
from lcm.nf.serializers.job_identifier import JobIdentifierSerializer
from lcm.pub.database.models import NfInstModel
from lcm.pub.exceptions import NFLCMException
from lcm.pub.exceptions import NFLCMExceptionConflict
from lcm.pub.exceptions import NFLCMExceptionNotFound
from lcm.pub.utils.jobutil import JobUtil
from lcm.nf.const import VNF_STATUS
from .common import view_safe_call_with_log

logger = logging.getLogger(__name__)


class TerminateVnfView(APIView):
    @swagger_auto_schema(
        request_body=TerminateVnfRequestSerializer(),
        responses={
            status.HTTP_202_ACCEPTED: JobIdentifierSerializer(),
            status.HTTP_500_INTERNAL_SERVER_ERROR: "Internal error"
        }
    )
    @view_safe_call_with_log(logger=logger)
    def post(self, request, instanceid):
        logger.debug("TerminateVnf--post::> %s" % request.data)

        terminate_vnf_request_serializer = TerminateVnfRequestSerializer(data=request.data)
        if not terminate_vnf_request_serializer.is_valid():
            raise NFLCMException(terminate_vnf_request_serializer.errors)

        job_id = JobUtil.create_job('NF', 'TERMINATE', instanceid)
        JobUtil.add_job_status(job_id, 0, "TERM_VNF_READY")

        self.terminate_pre_check(instanceid, job_id)
        TerminateVnf(terminate_vnf_request_serializer.data, instanceid, job_id).start()

        terminate_vnf_response_serializer = JobIdentifierSerializer(data={"jobId": job_id})
        if not terminate_vnf_response_serializer.is_valid():
            raise NFLCMException(terminate_vnf_response_serializer.errors)

        return Response(data=terminate_vnf_response_serializer.data, status=status.HTTP_202_ACCEPTED)

    def terminate_pre_check(self, nf_inst_id, job_id):
        vnf_insts = NfInstModel.objects.filter(nfinstid=nf_inst_id)
        if not vnf_insts.exists():
            raise NFLCMExceptionNotFound("VNF nf_inst_id does not exist.")

        if vnf_insts[0].status != 'INSTANTIATED':
            raise NFLCMExceptionConflict("VNF instantiationState is not INSTANTIATED.")

        vnf_insts.update(status=VNF_STATUS.TERMINATING)
        JobUtil.add_job_status(job_id, 15, 'Nf terminating pre-check finish')
        logger.info("Nf terminating pre-check finish")