from django.shortcuts import render
from .execptions import DiscountNotAvailableError
from rest_framework.views import APIView, Response
from django.shortcuts import get_object_or_404
from product.models import ProductVariant
from rest_framework.permissions import IsAuthenticated
from .serializers import *
# from cart.models import 
from rest_framework import status
from .models import OrderItemModel, OrderModel, DiscountCode
try:
    pass
except DiscountNotAvailableError:
    pass

"""

add post
remove delete
show get 

pay
"""



class ApplyDiscountView(APIView):
    serializer_class = DiscountCodeSerializer
    permission_classes = [IsAuthenticated]
    def post(self, request):
        cart_order, created = OrderModel.objects.get_or_create(
            user=request.user,
            status='CART'
        )
        discount_code = get_object_or_404(DiscountCode, code=request.data.get('code'))
        
        if not discount_code.is_valid():
            return Response({'detail': discount_code.not_valid_reason()}, status=status.HTTP_400_BAD_REQUEST)
        cart_order.discount_code = discount_code
        cart_order.save()
        return Response({'detail': 'کد تخفیف با موفقیت اعمال شد'}, status=status.HTTP_200_OK)



class CartItemClear(APIView):
    permission_classes = [IsAuthenticated]
    serializer_class = OrderItemSerailzier
    def delete(self, request):
        cart_order, created = OrderModel.objects.get_or_create(
            user=request.user,
            status='CART'
        )
        cart_order.items.all().delete()
        return Response({'detail': f'سبد خرید با موفقیت خالی شد'}, status=status.HTTP_204_NO_CONTENT)


class CartItemViews(APIView):
    permission_classes = [IsAuthenticated]
    serializer_class = OrderItemSerailzier
    def post(self, request, pk):
        product_variant = get_object_or_404(ProductVariant, pk=pk)
        response = 'محصول با موفقیت به سبد خرید اضافه شد'
        quantity = request.data.get('quantity', 1)
        quantity = max(quantity, 0)
        if product_variant.in_stock < quantity:
            quantity = product_variant.in_stock
            response = 'تعداد درخواستی بیشتر از موجودی محصول میباشد'

        cart_order, created = OrderModel.objects.get_or_create(user=request.user, status='CART')
        order_item, created = OrderItemModel.objects.get_or_create(order=cart_order, product=product_variant, defaults={'quantity': quantity})

        if not created and order_item.quantity:  
            order_item.quantity = quantity
            order_item.save()
        if not order_item.quantity:
            order_item.delete()
        return Response({'detail': response, 'count': quantity}, status=status.HTTP_202_ACCEPTED)
    
    
    def delete(self, request, pk):
        product_variant = get_object_or_404(ProductVariant, pk=pk)

        cart_order, created = OrderModel.objects.get_or_create(
            user=request.user,
            status='CART'
        )
        order_item = get_object_or_404(OrderItemModel, order=cart_order, product=product_variant)
        order_item.delete()
        return Response({'detail': f'محصول {product_variant.product.name} از سبد خرید پاک شد'}, status=status.HTTP_204_NO_CONTENT)



class CartView(APIView):
    permission_classes = [IsAuthenticated]
    serializer_class = CartSerializer
    def get(self, request):
        user = request.user
        cart_instance, created = OrderModel.objects.get_or_create(user=user, status='CART')
        cart_ser = self.serializer_class(instance=cart_instance, context={'request': request})
        return Response(cart_ser.data, status=status.HTTP_200_OK)


class OrderlistView(APIView):
    permission_classes = [IsAuthenticated]
    serializer_class = OrderSerializer
    def get(self, request):
        user = request.user
        orders = OrderModel.objects.filter(user=user).exclude(status="CART")
        orders_ser = self.serializer_class(instance=orders, many=True, context={'request': request})
        return Response(orders_ser.data, status=status.HTTP_200_OK)