from rest_framework import generics, status
from rest_framework.exceptions import NotFound, ValidationError
from rest_framework.permissions import IsAuthenticated
from rest_framework.response import Response
from rest_framework.views import APIView

from apps.billing.permissions import HasActiveFeature
from apps.orders.api.services import OrderStageService, generate_tracking_code
from apps.orders.models import Order, OrderStage, OrderStageLog

from .serializers import OrderSerializer, OrderStageLogSerializer, OrderStageSerializer


class _UserScopedListCreateView(generics.ListCreateAPIView):
    permission_classes = [IsAuthenticated, HasActiveFeature]
    feature_key = "orders"

    def get_queryset(self):
        return self.model.objects.filter(user=self.request.user)

    def perform_create(self, serializer):
        serializer.save(user=self.request.user)


class _UserScopedDetailView(generics.RetrieveUpdateDestroyAPIView):
    permission_classes = [IsAuthenticated, HasActiveFeature]
    feature_key = "orders"

    def get_queryset(self):
        return self.model.objects.filter(user=self.request.user)


class OrderStageListCreateView(_UserScopedListCreateView):
    model = OrderStage
    serializer_class = OrderStageSerializer

    def get_queryset(self):
        OrderStageService.ensure_default_stage(self.request.user)
        return super().get_queryset()


class OrderStageDetailView(_UserScopedDetailView):
    model = OrderStage
    serializer_class = OrderStageSerializer


class OrderListCreateView(_UserScopedListCreateView):
    model = Order
    serializer_class = OrderSerializer

    def perform_create(self, serializer):
        serializer.save(
            user=self.request.user,
            tracking_code=serializer.validated_data.get("tracking_code") or generate_tracking_code(),
        )


class OrderDetailView(_UserScopedDetailView):
    model = Order
    serializer_class = OrderSerializer


class AdvanceOrderStageView(APIView):
    """با هر بار زدن «مرحله‌ی بعد»، سفارش را به مرحله‌ی بعدیِ تعریف‌شده
    می‌برد و طبق قالبِ همان مرحله برای مشتریِ همین سفارش پیامک می‌فرستد."""

    permission_classes = [IsAuthenticated, HasActiveFeature]
    feature_key = "orders"

    def post(self, request, pk):
        if not Order.objects.filter(pk=pk, user=request.user).exists():
            raise NotFound("سفارش یافت نشد.")
        extra_input_value = request.data.get("extra_input_value", "")
        try:
            order, message_sent = OrderStageService.advance(request.user, pk, extra_input_value)
        except Order.DoesNotExist:
            raise NotFound("سفارش یافت نشد.")
        except ValueError as exc:
            raise ValidationError(str(exc))
        return Response(
            {**OrderSerializer(order).data, "message_sent": message_sent},
            status=status.HTTP_200_OK,
        )


class GenerateOrderTrackingCodeView(APIView):
    """یک کدِ پیگیریِ تازه برای سفارش می‌سازد — برای وقتی هنوز کدِ واقعیِ
    پستی را نداری ولی می‌خواهی از همین حالا یک مرجع به مشتری بدهی."""

    permission_classes = [IsAuthenticated, HasActiveFeature]
    feature_key = "orders"

    def post(self, request, pk):
        order = Order.objects.filter(pk=pk, user=request.user).first()
        if order is None:
            raise NotFound("سفارش یافت نشد.")
        order.tracking_code = generate_tracking_code()
        order.save(update_fields=["tracking_code", "updated_at"])
        return Response(OrderSerializer(order).data)


class OrderStageLogListView(generics.ListAPIView):
    serializer_class = OrderStageLogSerializer
    permission_classes = [IsAuthenticated, HasActiveFeature]
    feature_key = "orders"

    def get_queryset(self):
        return OrderStageLog.objects.filter(order_id=self.kwargs["pk"], order__user=self.request.user)