# Copyright (C) 2019 Verizon. 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 logging
import traceback

from drf_yasg.utils import swagger_auto_schema, no_body
from rest_framework import status
from rest_framework.decorators import api_view
from rest_framework.response import Response

from genericparser.packages.serializers.nsdm_filter_data \
    import NsdmNotificationsFilter
from genericparser.packages.serializers.nsdm_subscription import \
    NsdmSubscriptionsSerializer, \
    NsdmSubscriptionIdSerializer, \
    NsdmSubscriptionSerializer, \
    NsdmSubscriptionRequestSerializer
from genericparser.packages.serializers.response \
    import ProblemDetailsSerializer
from genericparser.pub.exceptions import \
    ResourceNotFoundException, \
    NsdmBadRequestException, NsdmDuplicateSubscriptionException
from genericparser.packages.biz.nsdm_subscription import NsdmSubscription


logger = logging.getLogger(__name__)


def validate_data(data, serializer):
    serialized_data = serializer(data=data)
    if not serialized_data.is_valid():
        logger.error('Data validation failed.')
        raise NsdmBadRequestException(serialized_data.errors)
    return serialized_data


def get_problem_details_serializer(title, status_code, error_message):
    problem_details = {
        "title": title,
        "status": status_code,
        "detail": error_message
    }
    problem_details_serializer = ProblemDetailsSerializer(data=problem_details)
    problem_details_serializer.is_valid()
    return problem_details_serializer


@swagger_auto_schema(
    method='POST',
    operation_description="Create Subscription for NSD Management",
    request_body=NsdmSubscriptionRequestSerializer(),
    responses={
        status.HTTP_201_CREATED: NsdmSubscriptionSerializer,
        status.HTTP_303_SEE_OTHER: ProblemDetailsSerializer(),
        status.HTTP_400_BAD_REQUEST: ProblemDetailsSerializer(),
        status.HTTP_500_INTERNAL_SERVER_ERROR: ProblemDetailsSerializer()
    }
)
@swagger_auto_schema(
    method='GET',
    operation_description="Query subscriptions for Nsd Management",
    request_body=no_body,
    responses={
        status.HTTP_200_OK: NsdmSubscriptionsSerializer(),
        status.HTTP_400_BAD_REQUEST: ProblemDetailsSerializer(),
        status.HTTP_404_NOT_FOUND: ProblemDetailsSerializer(),
        status.HTTP_500_INTERNAL_SERVER_ERROR: ProblemDetailsSerializer(),
    }
)
@api_view(http_method_names=['POST', 'GET'])
def nsd_subscription_rc(request):
    if request.method == 'POST':
        logger.debug("SubscribeNotification--post::> %s" % request.data)
        try:
            title = 'Creating Subscription Failed!'
            nsdm_subscription_request = \
                validate_data(request.data,
                              NsdmSubscriptionRequestSerializer)
            subscription = NsdmSubscription().create(
                nsdm_subscription_request.data)
            subscription_resp = validate_data(subscription,
                                              NsdmSubscriptionSerializer)
            return Response(data=subscription_resp.data,
                            status=status.HTTP_201_CREATED)
        except NsdmDuplicateSubscriptionException as e:
            logger.error(e.message)
            problem_details_serializer = \
                get_problem_details_serializer(title,
                                               status.HTTP_303_SEE_OTHER,
                                               e.message)
            return Response(data=problem_details_serializer.data,
                            status=status.HTTP_303_SEE_OTHER)
        except NsdmBadRequestException as e:
            problem_details_serializer = \
                get_problem_details_serializer(title,
                                               status.HTTP_400_BAD_REQUEST,
                                               e.message)
            return Response(data=problem_details_serializer.data,
                            status=status.HTTP_400_BAD_REQUEST)
        except Exception as e:
            logger.error(e.message)
            logger.error(traceback.format_exc())
            problem_details_serializer = \
                get_problem_details_serializer(
                    title,
                    status.HTTP_500_INTERNAL_SERVER_ERROR,
                    e.message)
            return Response(data=problem_details_serializer.data,
                            status=status.HTTP_500_INTERNAL_SERVER_ERROR)
    if request.method == 'GET':
        logger.debug("Subscription Notification GET %s" % request.query_params)
        try:
            title = 'Query Subscription Failed!'
            request_query_params = {}
            if request.query_params:
                request_query_params = \
                    validate_data(request.query_params,
                                  NsdmNotificationsFilter).data
            subscription_data = \
                NsdmSubscription().query_multi_subscriptions(
                    request_query_params)
            subscriptions = validate_data(subscription_data,
                                          NsdmSubscriptionsSerializer)
            return Response(data=subscriptions.data, status=status.HTTP_200_OK)
        except NsdmBadRequestException as e:
            logger.error(e.message)
            problem_details_serializer = \
                get_problem_details_serializer(title,
                                               status.HTTP_400_BAD_REQUEST,
                                               e.message)
            return Response(data=problem_details_serializer.data,
                            status=status.HTTP_400_BAD_REQUEST)
        except ResourceNotFoundException as e:
            problem_details_serializer = \
                get_problem_details_serializer(title,
                                               status.HTTP_404_NOT_FOUND,
                                               e.message)
            return Response(data=problem_details_serializer.data,
                            status=status.HTTP_404_NOT_FOUND)
        except Exception as e:
            logger.error(e.message)
            problem_details_serializer = \
                get_problem_details_serializer(
                    title,
                    status.HTTP_500_INTERNAL_SERVER_ERROR,
                    traceback.format_exc())
            return Response(data=problem_details_serializer.data,
                            status=status.HTTP_500_INTERNAL_SERVER_ERROR)


@swagger_auto_schema(
    method='GET',
    operation_description="Query subscriptions for Nsd Management",
    request_body=no_body,
    responses={
        status.HTTP_200_OK: NsdmSubscriptionSerializer(),
        status.HTTP_400_BAD_REQUEST: ProblemDetailsSerializer(),
        status.HTTP_404_NOT_FOUND: ProblemDetailsSerializer(),
        status.HTTP_500_INTERNAL_SERVER_ERROR: ProblemDetailsSerializer()
    }
)
@swagger_auto_schema(
    method='DELETE',
    operation_description="Delete subscription for Nsd Management",
    request_body=no_body,
    responses={
        status.HTTP_204_NO_CONTENT: 'No_Content',
        status.HTTP_400_BAD_REQUEST: ProblemDetailsSerializer(),
        status.HTTP_404_NOT_FOUND: ProblemDetailsSerializer(),
        status.HTTP_500_INTERNAL_SERVER_ERROR: ProblemDetailsSerializer()
    }
)
@api_view(http_method_names=['GET', 'DELETE'])
def nsd_subscription_rd(request, **kwargs):
    subscription_id = kwargs.get("subscriptionId")
    if request.method == 'GET':
        try:
            title = 'Query Subscription Failed!'
            validate_data({'subscription_id': subscription_id},
                          NsdmSubscriptionIdSerializer)
            subscription_data = \
                NsdmSubscription().query_single_subscription(subscription_id)
            subscription = validate_data(subscription_data,
                                         NsdmSubscriptionSerializer)
            return Response(data=subscription.data, status=status.HTTP_200_OK)
        except NsdmBadRequestException as e:
            logger.error(e.message)
            problem_details_serializer = \
                get_problem_details_serializer(title,
                                               status.HTTP_400_BAD_REQUEST,
                                               e.message)
            return Response(data=problem_details_serializer.data,
                            status=status.HTTP_400_BAD_REQUEST)
        except ResourceNotFoundException as e:
            logger.error(e.message)
            problem_details_serializer = \
                get_problem_details_serializer(title,
                                               status.HTTP_404_NOT_FOUND,
                                               e.message)
            return Response(data=problem_details_serializer.data,
                            status=status.HTTP_404_NOT_FOUND)
        except Exception as e:
            logger.error(e.message)
            logger.error(traceback.format_exc())
            problem_details_serializer = \
                get_problem_details_serializer(
                    title,
                    status.HTTP_500_INTERNAL_SERVER_ERROR,
                    "Query of subscriptioni(%s) Failed"
                    % subscription_id)
            return Response(data=problem_details_serializer.data,
                            status=status.HTTP_500_INTERNAL_SERVER_ERROR)
    elif request.method == 'DELETE':
        try:
            title = 'Delete Subscription Failed!'
            validate_data({'subscription_id': subscription_id},
                          NsdmSubscriptionIdSerializer)
            subscription_data = NsdmSubscription().\
                delete_single_subscription(subscription_id)
            return Response(status=status.HTTP_204_NO_CONTENT)
        except NsdmBadRequestException as e:
            logger.error(e.message)
            problem_details_serializer = \
                get_problem_details_serializer(title,
                                               status.HTTP_400_BAD_REQUEST,
                                               e.message)
            return Response(data=problem_details_serializer.data,
                            status=status.HTTP_400_BAD_REQUEST)
        except ResourceNotFoundException as e:
            logger.error(e.message)
            problem_details_serializer = \
                get_problem_details_serializer(title,
                                               status.HTTP_404_NOT_FOUND,
                                               e.message)
            return Response(data=problem_details_serializer.data,
                            status=status.HTTP_404_NOT_FOUND)
        except Exception as e:
            logger.error(e.message)
            logger.error(traceback.format_exc())
            problem_details_serializer = \
                get_problem_details_serializer(
                    title,
                    status.HTTP_500_INTERNAL_SERVER_ERROR,
                    "Delete of subscription(%s) Failed"
                    % subscription_id)
            return Response(data=problem_details_serializer.data,
                            status=status.HTTP_500_INTERNAL_SERVER_ERROR)