Implemented cart service with state tracker and linked to main layout

MidrandBookshop/Components/Layout/MainLayout.razor.cs

@@ -1,11 +1,19 @@
-using Microsoft.AspNetCore.Components.Routing;
-using Microsoft.AspNetCore.Components.Web;
-using Microsoft.AspNetCore.WebUtilities;
+using MidrandBookshop.Services.ShoppingCart;
+using MidrandBookshop.Services.ShoppingCart.Models;
 
 namespace MidrandBookshop.Components.Layout;
 
-public partial class MainLayout : IDisposable
+public partial class MainLayout(CartService cartService) : IDisposable
 {
+    [Inject]
+    private AuthenticationStateProvider AuthStateProvider { get; set; } = default!;
+
+    private Cart ShoppingCart => cartService.ShoppingCart;
+
+    private AuthenticationState? AuthState { get; set; }
+    private System.Security.Claims.ClaimsPrincipal? User { get; set; }
+    private bool IsAuthenticated => User?.Identity?.IsAuthenticated ?? false;
+
     private string SearchInputBuffer { get; set; } = string.Empty;
     private string GlobalSearchQuery { get; set; } = string.Empty;
     private bool IsSearchActive { get; set; } = false;
@@ -18,19 +26,25 @@ public partial class MainLayout : IDisposable
         new CartItem { Id = 3, Title = "Album Architectures, Maputo", Author = "Guedes Archive", Price = 350, Quantity = 1 }
     };
 
-    private void TriggerHeaderLogout()
+    protected override async Task OnInitializedAsync()
     {
-        // Force tear-down of the active client websocket pipeline safely
-        Navigation.NavigateTo("/logout", forceLoad: true);
-    }
+        AuthState = await AuthStateProvider.GetAuthenticationStateAsync();
+        User = AuthState!.User;
 
-    protected override void OnInitialized()
-    {
         Navigation.LocationChanged += OnLocationChanged;
+        cartService.OnCartChanged += CartService_OnCartChanged;
 
         SyncSearchQueryFromUrl();
     }
 
+    protected override async Task OnAfterRenderAsync(bool firstRender)
+    {
+        if (firstRender) 
+            await cartService.LoadCartFromStorageAsync();
+    }
+
+    private async void CartService_OnCartChanged() => await InvokeAsync(StateHasChanged);
+
     private void OnLocationChanged(object? sender, LocationChangedEventArgs e)
     {
         SyncSearchQueryFromUrl();
@@ -107,7 +121,8 @@ public partial class MainLayout : IDisposable
     }
 
     private void RemoveFromCart(CartItem item) => CartItems.Remove(item);
-    private int GetCartTotal() => CartItems.Sum(item => item.Price * item.Quantity);
+
+    private decimal GetCartTotal() => ShoppingCart?.TotalPrice ?? 0.00m;
 
     private void RedirectToCart()
     {
@@ -124,6 +139,9 @@ public partial class MainLayout : IDisposable
     public void Dispose()
     {
         Navigation.LocationChanged -= OnLocationChanged;
+        cartService.OnCartChanged -= CartService_OnCartChanged;
+
+        GC.SuppressFinalize(this);
     }
 
     public class CartItem