from django.shortcuts import get_object_or_404
from django.views.generic import TemplateView
from django.http.response import HttpResponse
from django.views.decorators.http import require_http_methods

from shop.models import Product, Cart, CartItem
from web.utils import get_cart, get_or_create_cart
from web.settings import ANONYMOUS_CART_ID_COOKIE_NAME


class IndexView(TemplateView):
    template_name = "web/index.html"

    def get_context_data(self, **kwargs):
        return {
            "title": "Shoppy",
        }


class ProductDetail(TemplateView):
    template_name = "web/product_detail.html"

    def get_context_data(self, pk, slug, **kwargs):
        product = get_object_or_404(Product, pk=pk)

        return {
            "product": product,
            "title": product.name,
            "description": product.description,
            "image": product.images.first(),
        }


@require_http_methods(
    [
        "POST",
    ]
)
def add_cart_item(request, *args, **kwargs):
    product = get_object_or_404(Product, pk=request.POST.get("product"))
    cart, created = get_or_create_cart(request)
    response = HttpResponse(status=201, headers={'HX-Trigger': 'updated-cart'})

    if created and request.user.is_anonymous:
        response.set_cookie(ANONYMOUS_CART_ID_COOKIE_NAME, cart.uuid)

    # Comprobamos si existe una línea de carrito para ese carrito de ese producto
    existing_cart_item = CartItem.objects.filter(cart=cart, product=product).first()

    # Si existe, simplemente le sumamos la cantidad a la línea ya existente
    if existing_cart_item is not None:
        existing_cart_item.quantity += int(request.POST.get("quantity"))
        existing_cart_item.save()
    # Si no, lo creamos
    else:
        CartItem.objects.create(
            cart=cart,
            quantity=request.POST.get("quantity"),
            product=product,
        )

    return response


@require_http_methods(
    [
        "POST",
    ]
)
def delete_cart_item(request, pk, *args, **kwargs):
    cart = get_or_create_cart(request)
    cart_item = get_object_or_404(CartItem, pk=pk, cart=cart)
    cart_item.delete()
    return HttpResponse(status=204, headers={'HX-Trigger': 'updated-cart'})


index = IndexView.as_view()
product_detail = ProductDetail.as_view()