import uuid
from typing import cast

from django_core.mixins import BaseViewSetMixin  # type: ignore
from django.utils.translation import gettext as _
from drf_spectacular.utils import extend_schema, OpenApiResponse
from rest_framework.exceptions import PermissionDenied  # type: ignore
from rest_framework.decorators import action  # type: ignore
from rest_framework.permissions import AllowAny, IsAdminUser  # type: ignore
from rest_framework.viewsets import ModelViewSet  # type: ignore
from rest_framework.request import HttpRequest  # type: ignore
from rest_framework.response import Response  # type: ignore
from rest_framework import status  # type: ignore
from rest_framework.views import APIView  # type: ignore
from rest_framework.parsers import MultiPartParser, FormParser  # type: ignore
from rest_framework.generics import get_object_or_404  # type: ignore

from core.apps.contracts.models import (
    ContractOwnerModel,
    ContractAttachedFileModel
)
from core.apps.contracts.serializers import (
    CreateContractOwnerSerializer,
    ListContractOwnerSerializer,
    RetrieveContractOwnerSerializer,
    UpdateContractOwnerSerializer,
    DestroyContractOwnerSerializer,

    RetrieveContractAttachedFileSerializer,
    CreateContractAttachedFileSerializer,
    CreateContractFileContentFromOwnerSerializer,
)


@extend_schema(tags=["ContractOwner"])
class ContractOwnerView(BaseViewSetMixin, ModelViewSet):
    queryset = ContractOwnerModel.objects.all()
    serializer_class = ListContractOwnerSerializer
    permission_classes = [AllowAny]

    action_permission_classes = {
        "list": [IsAdminUser],
        "retrieve": [IsAdminUser],
        "create": [IsAdminUser],
        "update": [IsAdminUser],
        "destroy": [IsAdminUser],
    }
    action_serializer_class = {  # type: ignore
        "list": ListContractOwnerSerializer,
        "retrieve": RetrieveContractOwnerSerializer,
        "create": CreateContractOwnerSerializer,
        "update": UpdateContractOwnerSerializer,
        "destroy": DestroyContractOwnerSerializer,
    }


class ContractOwnerFileViewSet(BaseViewSetMixin, ModelViewSet):
    queryset = ContractOwnerModel.objects.all()
    serializer_class = RetrieveContractAttachedFileSerializer
    permission_classes = [AllowAny]

    # action_permission_classes = {
        # "create_file": [AllowAny],
        # "list_file": [AllowAny]
    # }
    action_serializer_class = {  # type: ignore
        "list_file": RetrieveContractAttachedFileSerializer,
        "create_file": CreateContractAttachedFileSerializer,
    }

    @extend_schema(
        summary="Contract Files Related to Owner",
        description="Contract Files Related to Owner",
    )
    @action(url_path="files", methods=["GET"], detail=True)
    def list_file(
        self,
        request: HttpRequest,
        *args: object,
        **kwargs: object,
    ) -> Response:
        owner = cast(ContractOwnerModel, self.get_object())
        files = ContractAttachedFileModel.objects.filter(
            contract__owners=owner, contents__owner=owner
        ).select_related("contents")
        serializer = self.get_serializer(instance=files, many=True)
        return Response(serializer.data, status.HTTP_200_OK)

    @extend_schema(
        summary="Create Contract Files Related to Owner",
        description="Create Contract Files Related to Owner"
    )
    @action(url_path="files", methods=["GET"], detail=True)
    def create_file(
        self,
        request: HttpRequest,
        *args: object,
        **kwargs: object,
    ) -> Response:
        owner = cast(
            ContractOwnerModel, 
            self.get_queryset().select_related("contract")
        )
        if not owner.contract.allow_add_files:
            raise PermissionDenied(_("Attaching new files was restricted for this contract."))
        ser = self.get_serializer(data=request.data)
        ser.is_valid(raise_exception=True)
        ser.save()  # type: ignore
        return Response(ser.data, status.HTTP_201_CREATED)


class ContractAttachedFileDeleteView(APIView):
    permission_classes = [AllowAny]

    @extend_schema(
        # request=ContractFileDeleteRequestSerializer,
        responses={204: OpenApiResponse(description="File successfully deleted.")},
        summary="Delete a file from contract",
        description="Deletes a contract-attached file if contract allows file deletion.",
    )
    def delete(
        self,
        request: HttpRequest,
        owner_id: uuid.UUID,
        file_id: uuid.UUID,
        *args: object,
        **kwargs: object
    ) -> Response:
        owner = get_object_or_404(
            ContractOwnerModel.objects.all().select_related("contract"), pk=owner_id
        )
        if not owner.contract.allow_delete_files:
            raise PermissionDenied(_("Deleting attached files was restricted for this contract"))
        file = get_object_or_404(
            ContractAttachedFileModel.objects.all().select_related("contract"),
            pk=file_id
        )
        if owner.contract.pk != file.contract.pk:
            raise PermissionDenied(_("Contract have no such file attached"))
        file.delete()
        return Response(status=status.HTTP_204_NO_CONTENT)
        

class UploadFileContentView(APIView):
    permission_classes = [AllowAny]
    parser_classes = [MultiPartParser, FormParser]  # type: ignore

    @extend_schema(
        summary="Uploads a file for contract attached files",
        description="Creates a file for contract attached files.",
        request=CreateContractFileContentFromOwnerSerializer,
        responses={201: CreateContractFileContentFromOwnerSerializer},
    )
    def post(
        self,
        request: HttpRequest,
        owner_id: uuid.UUID,
        file_id: uuid.UUID,
        *args: object,
        **kwargs: object
    ) -> Response:
        serializer = CreateContractFileContentFromOwnerSerializer(
            data=request.data,  # type: ignore 
            context={
                "file_id": file_id,
                "contract_owner_id": owner_id,
            }
        )
        serializer.is_valid(raise_exception=True)
        serializer.save()  # type: ignore
        return Response(serializer.data, status=status.HTTP_201_CREATED)