from django.http.response import HttpResponse
from django.shortcuts import get_object_or_404
from django.utils.text import gettext_lazy as _
from django.views.decorators.http import require_http_methods
from django.views.generic import TemplateView

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


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

    def get_context_data(self, **kwargs):
        settings = WebSettings.load()
        return {
            "title": settings.web_title,
            "web_title": settings.web_title,
            "description": settings.web_description,
        }


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

    def get_context_data(self, pk, slug, **kwargs):
        settings = WebSettings.load()
        product = get_object_or_404(Product, pk=pk)

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


class CartDetail(TemplateView):
    template_name = "web/cart_detail.html"

    def get_context_data(self, **kwargs):
        web_settings = WebSettings.load()
        cart, created = get_or_create_cart(self.request)
        cart_items = CartItem.objects.filter(cart=cart).prefetch_related("product")

        return {
            "cart": cart,
            "items": cart_items,
            "title": web_settings.web_title,
            "description": _("resumen del carrito"),
        }


@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, created = 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()
cart_detail = CartDetail.as_view()