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

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


from django.contrib.auth import login as login_user
from django.contrib.auth import logout as logout_user
from django.shortcuts import redirect, render, reverse
from django.views.generic import TemplateView, View

from users.forms import LoginForm


class RedirectionMixin:
    redirect_to = ""

    def get_redirection(self):
        return reverse(self.redirect_to)


class LoginView(View, RedirectionMixin):
    template_name = "users/login.html"
    redirect_to = "web:index"
    login_form_class = LoginForm

    def get_login_form(self, request):
        return self.login_form_class(data=request.POST)

    def get(self, request, *args, **kwargs):
        if request.user.is_authenticated:
            return redirect(self.get_redirection())

        login_form = self.login_form_class()
        return render(request, self.template_name, {"form": login_form})

    def post(self, request, *args, **kwargs):
        login_form = self.get_login_form(request)

        if login_form.is_valid():
            login_user(request, login_form.get_user())

            if not login_form.cleaned_data.get('remember_me'):
                request.session.set_expiry(0)

            return redirect(self.get_redirection())

        return render(request, self.template_name, {"form": login_form}, status=400)


class LogoutView(View, RedirectionMixin):
    redirect_to = "web:index"

    def get(self, request, *args, **kwargs):
        logout_user(request)
        return redirect(self.get_redirection())

    def post(self, request, *args, **kwargs):
        logout_user(request)
        return redirect(self.get_redirection())


class RegisterView(TemplateView):
    template_name = "web/register.html"


class ResetPasswordView(TemplateView):
    template_name = "web/reset-password.html"


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, 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()

login = LoginView.as_view()
logout = LogoutView.as_view()
register = RegisterView.as_view()
reset_password = ResetPasswordView.as_view()