midrandbooks/MidrandBookshop/Components/Pages/Cart.razor.cs

using MidrandBookshop.Services.ShoppingCart;
using MidrandBookshop.Services.ShoppingCart.Models;

namespace MidrandBookshop.Components.Pages;

public partial class Cart(CartService cartService)
{
    protected Services.ShoppingCart.Models.Cart ShoppingCart => cartService?.ShoppingCart!;

    protected async void IncreaseQty(CartItem item)
    {
        if (item is not null)
        {
            cartService.UpdateQuantity(item!.Price!.Id, 1);

            await cartService.SaveCartToStorageAsync();
        }
    }
    protected async void DecreaseQty(CartItem item, int delta)
    {
        var peekQuantity = item.Quantity + delta;

        if (peekQuantity < 1) return;

        cartService.UpdateQuantity(item!.Price!.Id, delta);

        await cartService.SaveCartToStorageAsync();
    }

    private async void RemoveFromCart(CartItem item)
    {
        cartService.RemoveOneItem(item.Price!.Id);

        await cartService.SaveCartToStorageAsync();
    }
}