from django.contrib.auth.models import User
from django.test import TestCase
from django.urls import reverse

from shop.models import Cart, CartItem
from shop.tests.mixins import CreateProductsMixin
from web.settings import ANONYMOUS_CART_ID_COOKIE_NAME


class TestCart(TestCase, CreateProductsMixin):
    def setUp(self):
        self.product = self.create_product()
        self.user = User.objects.create_user("vader", "darth@vader.com", "ihatesand")

    def test_anonymous_cart(self):
        assert Cart.objects.count() == 0
        response = self.client.get(reverse("web:cart_dropdown"))
        assert response.status_code == 200
        cart = Cart.objects.all().first()
        assert cart is not None
        assert response.cookies.get(ANONYMOUS_CART_ID_COOKIE_NAME).value == str(
            cart.uuid
        )

    def test_logged_user_without_cart(self):
        assert Cart.objects.count() == 0
        self.client.force_login(self.user)
        response = self.client.get(reverse("web:cart_dropdown"))
        assert response.status_code == 200
        assert Cart.objects.count() == 1
        assert not response.cookies.get(ANONYMOUS_CART_ID_COOKIE_NAME)

    def test_logged_user_with_cart(self):
        Cart.objects.create(user=self.user)
        self.client.force_login(self.user)
        response = self.client.get(reverse("web:cart_dropdown"))
        assert response.status_code == 200
        assert not response.cookies.get(ANONYMOUS_CART_ID_COOKIE_NAME)

    def test_add_product_cart_item_to_anonymous_user_cart(self):
        quantity = 2
        assert Cart.objects.count() == 0

        response = self.client.post(
            reverse("web:add_cart_item"),
            {"product": self.product.pk, "quantity": quantity},
        )
        assert response.status_code == 201

        cart = Cart.objects.all().first()
        assert cart is not None
        assert response.cookies.get(ANONYMOUS_CART_ID_COOKIE_NAME).value == str(
            cart.uuid
        )

        cart_item = CartItem.objects.filter(cart=cart).first()
        assert cart_item is not None

        assert cart_item.quantity == quantity

    def test_add_product_cart_item_to_logged_user_cart(self):
        quantity = 2
        assert Cart.objects.count() == 0
        self.client.force_login(self.user)

        response = self.client.post(
            reverse("web:add_cart_item"),
            {"product": self.product.pk, "quantity": quantity},
        )
        assert response.status_code == 201

        cart = Cart.objects.all().first()
        assert cart is not None
        assert not response.cookies.get(ANONYMOUS_CART_ID_COOKIE_NAME)

        cart_item = CartItem.objects.filter(cart=cart).first()
        assert cart_item is not None

        assert cart_item.quantity == quantity

    def test_add_product_cart_item_to_logged_user_with_existing_cart(self):
        quantity = 2
        Cart.objects.create(user=self.user)
        self.client.force_login(self.user)

        response = self.client.post(
            reverse("web:add_cart_item"),
            {"product": self.product.pk, "quantity": quantity},
        )
        assert response.status_code == 201

        cart = Cart.objects.all().first()
        assert cart is not None
        assert not response.cookies.get(ANONYMOUS_CART_ID_COOKIE_NAME)

        cart_item = CartItem.objects.filter(cart=cart).first()
        assert cart_item is not None

        assert cart_item.quantity == quantity

    def test_add_same_product_cart_item_multiple_times(self):
        quantity = 2
        Cart.objects.create(user=self.user)
        self.client.force_login(self.user)

        response = self.client.post(
            reverse("web:add_cart_item"),
            {"product": self.product.pk, "quantity": quantity},
        )
        assert response.status_code == 201

        response = self.client.post(
            reverse("web:add_cart_item"),
            {"product": self.product.pk, "quantity": quantity},
        )
        assert response.status_code == 201

        cart = Cart.objects.all().first()
        assert cart is not None
        assert not response.cookies.get(ANONYMOUS_CART_ID_COOKIE_NAME)

        cart_item = CartItem.objects.filter(cart=cart).first()
        assert cart_item is not None

        assert cart_item.quantity == quantity * 2
        assert CartItem.objects.filter(cart=cart).count() == 1

    def test_create_delete_cart_item_anonymous_cart(self):
        quantity = 2
        assert Cart.objects.count() == 0

        response = self.client.post(
            reverse("web:add_cart_item"),
            {"product": self.product.pk, "quantity": quantity},
        )
        assert response.status_code == 201

        cart = Cart.objects.all().first()
        assert cart is not None
        assert response.cookies.get(ANONYMOUS_CART_ID_COOKIE_NAME).value == str(
            cart.uuid
        )

        cart_item = CartItem.objects.filter(cart=cart).first()
        assert cart_item is not None

        assert cart_item.quantity == quantity

        response = self.client.post(
            reverse("web:delete_cart_item", kwargs={"pk": cart_item.pk}),
            {"product": self.product.pk, "quantity": quantity},
        )
        assert response.status_code == 204
        assert CartItem.objects.filter(cart=cart).count() == 0

    def test_create_delete_cart_item_logged_user_cart(self):
        quantity = 2
        assert Cart.objects.count() == 0

        self.client.force_login(self.user)
        response = self.client.post(
            reverse("web:add_cart_item"),
            {"product": self.product.pk, "quantity": quantity},
        )
        assert response.status_code == 201

        cart = Cart.objects.all().first()
        assert cart is not None
        assert not response.cookies.get(ANONYMOUS_CART_ID_COOKIE_NAME)

        cart_item = CartItem.objects.filter(cart=cart).first()
        assert cart_item is not None

        assert cart_item.quantity == quantity

        response = self.client.post(
            reverse("web:delete_cart_item", kwargs={"pk": cart_item.pk}),
            {"product": self.product.pk, "quantity": quantity},
        )
        assert response.status_code == 204
        assert CartItem.objects.filter(cart=cart).count() == 0