feat: implement VAT management service and integrate VAT calculations across components

src/FrontOffice.Main/Utilities/CartService.cs

@@ -1,6 +1,7 @@
 using DateTimeConverterCL;
 using FrontOffice.BFF.ShopingCart.Protobuf.Protos.ShopingCart;
 using Google.Protobuf.WellKnownTypes;
+using Blazored.LocalStorage;
 
 namespace FrontOffice.Main.Utilities;
 
@@ -16,13 +17,18 @@ public record CartItem(long cartId,long ProductId, string Title, string ImageUrl
 public class CartService
 {
     private readonly ShopingCartContract.ShopingCartContractClient _client;
+    private readonly ILocalStorageService _localStorage;
     private readonly List<CartItem> _items = new();
+    private const string TokenStorageKey = "auth:token";
+    private bool _isInitialized;
+    
     public event Action? OnChange;
 
-    public CartService(ShopingCartContract.ShopingCartContractClient client)
+    public CartService(ShopingCartContract.ShopingCartContractClient client, ILocalStorageService localStorage)
     {
         _client = client;
-        _ = LoadFromServerAsync();
+        _localStorage = localStorage;
+        // لود سبد خرید به صورت lazy انجام میشه - نه در constructor
     }
 
     public IReadOnlyList<CartItem> Items => _items.AsReadOnly();
@@ -33,6 +39,13 @@ public class CartService
     public async Task Add(Product product, int quantity = 1)
     {
         if (quantity <= 0) return;
+        
+        // اطمینان از لود شدن سبد خرید
+        await EnsureInitializedAsync();
+        
+        // چک لاگین بودن کاربر
+        if (!await IsAuthenticatedAsync()) return;
+        
         var existing = _items.FirstOrDefault(i => i.ProductId == product.Id);
         int newQuantity;
 
@@ -82,11 +95,14 @@ public class CartService
 
     public async Task UpdateQuantity(long productId, int quantity)
     {
+        // چک لاگین بودن کاربر
+        if (!await IsAuthenticatedAsync()) return;
+        
         var existing = _items.FirstOrDefault(i => i.ProductId == productId);
         if (existing is null) return;
         if (quantity <= 0)
         {
-            Remove(existing.cartId);
+            await Remove(existing.cartId);
             return;
         }
         var idx = _items.IndexOf(existing);
@@ -109,6 +125,9 @@ public class CartService
 
     public async Task Remove(long cartId)
     {
+        // چک لاگین بودن کاربر
+        if (!await IsAuthenticatedAsync()) return;
+        
         _items.RemoveAll(i => i.cartId == cartId);
         Notify();
 
@@ -129,6 +148,9 @@ public class CartService
 
     public async Task Clear()
     {
+        // چک لاگین بودن کاربر
+        if (!await IsAuthenticatedAsync()) return;
+        
         var productIds = _items.Select(i => i.ProductId).ToList();
         _items.Clear();
         Notify();
@@ -152,8 +174,44 @@ public class CartService
 
     private void Notify() => OnChange?.Invoke();
 
+    /// <summary>
+    /// بررسی اینکه کاربر لاگین کرده یا نه
+    /// </summary>
+    private async Task<bool> IsAuthenticatedAsync()
+    {
+        try
+        {
+            var token = await _localStorage.GetItemAsync<string>(TokenStorageKey);
+            return !string.IsNullOrWhiteSpace(token);
+        }
+        catch
+        {
+            return false;
+        }
+    }
+
+    /// <summary>
+    /// اطمینان از لود شدن سبد خرید - فقط اگر کاربر لاگین کرده باشد
+    /// </summary>
+    public async Task EnsureInitializedAsync()
+    {
+        if (_isInitialized) return;
+        
+        if (await IsAuthenticatedAsync())
+        {
+            await LoadFromServerAsync();
+        }
+        _isInitialized = true;
+    }
+
     private async Task LoadFromServerAsync()
     {
+        // ابتدا چک کن که کاربر لاگین کرده
+        if (!await IsAuthenticatedAsync())
+        {
+            return;
+        }
+        
         try
         {
             var response = await _client.GetAllUserCartAsync(new Empty());