from django.shortcuts import get_object_or_404

from django_core.mixins import BaseViewSetMixin
from django_filters.rest_framework import DjangoFilterBackend
from drf_spectacular.utils import extend_schema
from rest_framework.filters import OrderingFilter, SearchFilter
from rest_framework.pagination import PageNumberPagination
from rest_framework.permissions import AllowAny, IsAuthenticated
from rest_framework.viewsets import ModelViewSet
from rest_framework.response import Response
from rest_framework.views import APIView
from rest_framework import status

from core.apps.evaluation.filters.request import EvaluationrequestFilter
from core.apps.evaluation.models import EvaluationrequestModel
from core.apps.evaluation.serializers.request import (
    CreateEvaluationrequestSerializer,
    ListEvaluationrequestSerializer,
    RetrieveEvaluationrequestSerializer,
    ArchiveEvaluationrequestSerializer,
)
from core.apps.evaluation.choices.request import RequestStatus
from rest_framework.generics import GenericAPIView
from drf_spectacular.utils import OpenApiResponse


# class RequestPagination(PageNumberPagination):
#     page_size = 20
#     page_size_query_param = "limit"
#     max_page_size = 100


@extend_schema(tags=["EvaluationRequest"])
class EvaluationrequestView(BaseViewSetMixin, ModelViewSet):
    serializer_class = ListEvaluationrequestSerializer
    permission_classes = [IsAuthenticated]
    # pagination_class = RequestPagination

    filter_backends = [DjangoFilterBackend, SearchFilter, OrderingFilter]
    filterset_class = EvaluationrequestFilter
    search_fields = [
        "customer_inn_number",
        "owner_inn_number",
        "tex_passport",
    ]
    ordering_fields = [
        "id",
        "rate_type",
        "rate_type_display",
        "object_type",
        "object_type_display",
        "customer_inn_number",
        "owner_inn_number",
        "tex_passport",
        "value_determined",
        "rate_goal",
        "property_rights",
        "form_ownership",
        "worked_hours",
        "chassi",
        "need_delivering",
        "location",
        "location_name",
        "status",
        "status_display",
        "user",
        "created_at",
        "updated_at",
    ]
    ordering = ["-created_at"]

    action_permission_classes = {}
    action_serializer_class = {
        "list": ListEvaluationrequestSerializer,
        "retrieve": RetrieveEvaluationrequestSerializer,
        "create": CreateEvaluationrequestSerializer,
    }

    def serializer_context(self):
        return self.serializer_class(context={"request": self.request})

    def get_queryset(self):
        return EvaluationrequestModel.objects.filter(
            user=self.request.user
        ).order_by("-created_at")



@extend_schema(tags=["EvaluationRequest"])
class AdminEvaluationrequestView(BaseViewSetMixin, ModelViewSet):
    serializer_class = ListEvaluationrequestSerializer
    permission_classes = [IsAuthenticated]
    # pagination_class = RequestPagination

    filter_backends = [DjangoFilterBackend, SearchFilter, OrderingFilter]
    filterset_class = EvaluationrequestFilter
    search_fields = [
        "customer_inn_number",
        "owner_inn_number",
        "tex_passport",
    ]
    ordering_fields = [
        "id",
        "rate_type",
        "rate_type_display",
        "object_type",
        "object_type_display",
        "customer_inn_number",
        "owner_inn_number",
        "tex_passport",
        "value_determined",
        "rate_goal",
        "property_rights",
        "form_ownership",
        "worked_hours",
        "chassi",
        "need_delivering",
        "location",
        "location_name",
        "status",
        "status_display",
        "user",
        "created_at",
        "updated_at",
    ]
    ordering = ["-created_at"]

    action_permission_classes = {}
    action_serializer_class = {
        "list": ListEvaluationrequestSerializer,
        "retrieve": RetrieveEvaluationrequestSerializer,
        "create": CreateEvaluationrequestSerializer,
    }

    def get_queryset(self):
        return EvaluationrequestModel.objects.select_related("value_determined", "rate_goal", "property_rights", "form_ownership", "user").order_by("-created_at")

    def serializer_context(self):
        return self.serializer_class(context={"request": self.request})


@extend_schema(tags=["EvaluationRequest"])
class EvaluationStatusChange(APIView):
    permission_classes = [IsAuthenticated]

    def post(self, request, pk):
        if request.user.role not in [RoleChoice.ADMIN, RoleChoice.SUPERUSER]:
            return Response({'detail': 'Forbidden'}, status=status.HTTP_403_FORBIDDEN)

        evaluation = get_object_or_404(EvaluationrequestModel, pk=pk)


        status_value = request.data.get('status')
        if not status_value:
            return Response({'detail': 'Status is required'}, status=status.HTTP_400_BAD_REQUEST)

        valid_statuses = [
            RequestStatus.PENDING,
            RequestStatus.IN_PROGRESS,
            RequestStatus.COMPLETED,
            RequestStatus.REJECTED
        ]

        if status_value not in valid_statuses:
            return Response(
                {'detail': f'Invalid status. Must be one of: {valid_statuses}'},
                status=status.HTTP_400_BAD_REQUEST
            )

        evaluation.status = status_value
        evaluation.save()

        return Response({
            'success': True,
            'status': evaluation.status,
            'id': evaluation.pk
        })

@extend_schema(tags=["EvaluationRequest"])
class ArchiveEvaluationrequestView(GenericAPIView):
    permission_classes = [IsAuthenticated]

    def get_serializer_class(self):
        if self.request.method == "GET":
            return ListEvaluationrequestSerializer
        return ArchiveEvaluationrequestSerializer

    @extend_schema(
        tags=["EvaluationRequest"],
        summary="Get archived evaluation requests list",
        description="""
        Returns only archived evaluation requests.

        This endpoint works like evaluation-request/,
        but only records with is_archive=True are returned.
        """,
        responses={200: ListEvaluationrequestSerializer(many=True)},
    )
    def get(self, request, *args, **kwargs):
        queryset = EvaluationrequestModel.objects.filter(
            is_archive=True
        ).order_by("-created_at")

        serializer = self.get_serializer(queryset, many=True)

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

    @extend_schema(
        tags=["EvaluationRequest"],
        summary="Archive or unarchive evaluation request",
        description="""
        Update archive status for evaluation request.

        - is_archive=true → archive
        - is_archive=false → remove from archive
        """,
        request=ArchiveEvaluationrequestSerializer,
        responses={
            200: OpenApiResponse(
                description="Archive status updated successfully"
            ),
            400: OpenApiResponse(
                description="Validation error"
            ),
            404: OpenApiResponse(
                description="Evaluation request not found"
            ),
        },
    )
    def post(self, request, *args, **kwargs):
        serializer = self.get_serializer(data=request.data)
        serializer.is_valid(raise_exception=True)

        validated_data = serializer.validated_data

        obj = get_object_or_404(
            EvaluationrequestModel,
            id=validated_data["id"]
        )

        obj.is_archive = validated_data["is_archive"]
        obj.save(update_fields=["is_archive"])

        return Response(
            {
                "success": True,
                "message": "Archive status updated successfully"
            },
            status=status.HTTP_200_OK
        )