Implemented cart service with state tracker and linked to main layout

MidrandBookshop/Components/Pages/ProductView.razor.cs

@@ -3,6 +3,7 @@ using LiteCharms.Features.MidrandBooks.Authors;
 using LiteCharms.Features.MidrandBooks.Authors.Models;
 using LiteCharms.Features.MidrandBooks.Products;
 using LiteCharms.Features.MidrandBooks.Products.Models;
+using MidrandBookshop.Services.ShoppingCart;
 
 namespace MidrandBookshop.Components.Pages;
 
@@ -12,10 +13,12 @@ public partial class ProductView : ComponentBase
 
     [Inject] private ProductService ProductService { get; set; } = default!;
     [Inject] private AuthorService AuthorService { get; set; } = default!;
+    [Inject] private CartService CartService { get; set; } = default!;
     [Inject] private NavigationManager Navigation { get; set; } = default!;
 
     protected bool IsLoading { get; private set; } = true;
     protected Product? CurrentProduct { get; private set; }
+    protected ProductPrice? CurrentPrice { get; private set; }
     protected decimal LivePrice { get; private set; } = 0.00m;
     protected string AuthorName { get; private set; } = "Unknown Author";
     protected string PrimaryCategory { get; private set; } = "General";
@@ -44,6 +47,7 @@ public partial class ProductView : ComponentBase
 
                 var priceResult = await ProductService.GetProductPriceAsync(BookId);
                 LivePrice = priceResult.IsSuccess ? priceResult.Value.Amount : 0m;
+                CurrentPrice = priceResult.IsSuccess ? priceResult.Value : null;
 
                 var categoryResult = await ProductService.GetProductCategoriesAsync(BookId);
                 if (categoryResult.IsSuccess && categoryResult.Value.Length > 0)
@@ -73,6 +77,7 @@ public partial class ProductView : ComponentBase
         catch (Exception)
         {
             CurrentProduct = null;
+            CurrentPrice = null;
         }
         finally
         {
@@ -80,14 +85,34 @@ public partial class ProductView : ComponentBase
         }
     }
 
-    protected void IncreaseQty() => Quantity++;
-    protected void DecreaseQty() { if (Quantity > 1) Quantity--; }
+    protected void IncreaseQty()
+    {
+        Quantity++;
 
-    protected void HandleAddToCart()
+        if (CurrentPrice is not null)
+            CartService.UpdateQuantity(CurrentPrice!.Id, Quantity);
+    }
+    protected void DecreaseQty() 
+    {
+        if (Quantity > 1)
+        {
+            Quantity--;
+
+            CartService.UpdateQuantity(CurrentPrice!.Id, Quantity);
+        }
+    }
+
+    protected async void HandleAddToCart()
     {
         if (CurrentProduct == null) return;
+
+        if (CurrentPrice is not null)
+        {
+            CartService.AddItem(CurrentPrice);
+            Quantity++;
+        }
     }
-        
+
     protected void ViewAllAuthorBooks()
     {
         if (CurrentAuthor is not null)