Wired up CartDrawel and ProductView to cart service and local storage

MidrandBookshop/Services/ShoppingCart/CartService.cs

@@ -1,5 +1,6 @@
 using LiteCharms.Features.Browser;
 using LiteCharms.Features.Hasher;
+using LiteCharms.Features.MidrandBooks.Authors.Models;
 using LiteCharms.Features.MidrandBooks.Products.Models;
 using MidrandBookshop.Services.ShoppingCart.Models;
 
@@ -30,7 +31,7 @@ public sealed class CartService(LocalStorageService localStorage)
 
     public async Task SaveCartToStorageAsync() => await localStorage.SaveAsync(CartStorageKey, ShoppingCart);
 
-    public void AddItem(ProductPrice productPrice)
+    public void AddItem(ProductPrice productPrice, Product product, Author author)
     {
         var itemExists = false;
 
@@ -50,6 +51,8 @@ public sealed class CartService(LocalStorageService localStorage)
         if (!itemExists)
             ShoppingCart.Items.Add(new CartItem
             {
+                Product = product,
+                Author = author,
                 Price = productPrice,
                 Amount = productPrice.Amount,
                 Quantity = 1,
@@ -59,16 +62,8 @@ public sealed class CartService(LocalStorageService localStorage)
         NotifyStateChanged();
     }
 
-    public void UpdateQuantity(long productPriceId, int newQuantity)
+    public void UpdateQuantity(long productPriceId, int delta)
     {
-        if (newQuantity <= 0)
-        {
-            RemoveAllSameItem(productPriceId);
-            NotifyStateChanged();
-
-            return;
-        }
-
         for (var i = 0; i < ShoppingCart.Items.Count; i++)
         {
             if (ShoppingCart.Items[i].Price!.Id == productPriceId)
@@ -76,8 +71,8 @@ public sealed class CartService(LocalStorageService localStorage)
                 var oldQuantity = ShoppingCart.Items[i].Quantity;
                 var pricePerUnit = ShoppingCart.Items[i].Price!.Amount;
 
-                ShoppingCart.Items[i].Quantity = newQuantity;
-                ShoppingCart.Items[i].Amount = pricePerUnit * newQuantity;
+                ShoppingCart.Items[i].Quantity += delta;
+                ShoppingCart.Items[i].Amount = pricePerUnit * ShoppingCart.Items[i].Quantity;
                 break;
             }
         }
@@ -94,7 +89,9 @@ public sealed class CartService(LocalStorageService localStorage)
             {
                 if (ShoppingCart.Items[i].Quantity <= 1)
                 {
-                    ShoppingCart.Items.RemoveAt(i);
+                    ShoppingCart.Items.Remove(ShoppingCart.Items[i]);
+
+                    break;
                 }
                 else
                 {

MidrandBookshop/Services/ShoppingCart/Models/CartItem.cs

@@ -1,12 +1,17 @@
-using LiteCharms.Features.MidrandBooks.Products.Models;
+using LiteCharms.Features.MidrandBooks.Authors.Models;
+using LiteCharms.Features.MidrandBooks.Products.Models;
 
 namespace MidrandBookshop.Services.ShoppingCart.Models;
 
 public sealed class CartItem
 {
+    public Author? Author { get; set; }
+
+    public Product? Product { get; set; }
+
     public ProductPrice? Price { get; set; }
 
-    public long Quantity { get; set; }
+    public int Quantity { get; set; }
 
     public decimal Amount { get; set; }
 }