SushiBar/SushiBarContracts/StoragesContracts/IShopStorage.cs

@@ -13,6 +13,7 @@ namespace SushiBarContracts.StoragesContracts
         ShopViewModel? Insert(ShopBindingModel model);
         ShopViewModel? Update(ShopBindingModel model);
         ShopViewModel? Delete(ShopBindingModel model);
+        bool IsEnoughSushi(ISushiModel model, int count);
         bool SellSushi(ISushiModel model, int count);
     }
 }

SushiBar/SushiBarDatabaseImplement/Implements/ShopStorage.cs

@@ -100,6 +100,10 @@ namespace SushiBarDatabaseImplement.Implements
             }
             return null;
         }
+        public bool IsEnoughSushi(ISushiModel model, int count)
+        {
+            throw new NotImplementedException();
+        }
         public bool SellSushi(ISushiModel model, int count)
         {
             using var context = new SushiBarDatabase();

SushiBar/SushiBarFileImplement/Implements/ShopStorage.cs

@@ -72,9 +72,16 @@ namespace SushiBarFileImplement.Implements
             return null;
         }
 
+        public bool IsEnoughSushi(ISushiModel model, int count)
+        {
+            int temp = source.Shops
+                .Select(x => x.ListSushi.FirstOrDefault(y => y.Key == model.Id).Value.Item2).Sum();
+            return temp >= count;
+        }
+
         public bool SellSushi(ISushiModel model, int count)
         {
-            if (source.Shops.Select(x => x.ListSushi.FirstOrDefault(y => y.Key == model.Id).Value.Item2).Sum() < count)
+            if (!IsEnoughSushi(model, count))
             {
                 return false;
             }

SushiBar/SushiBarListImplement/Implements/ShopStorage.cs

@@ -100,6 +100,11 @@ namespace SushiBarListImplement.Implements
             return null;
         }
 
+        public bool IsEnoughSushi(ISushiModel model, int count)
+        {
+            throw new NotImplementedException();
+        }
+
         public bool SellSushi(ISushiModel model, int count)
         {
             throw new NotImplementedException();