Update handleBuyProduct

src/handlers/userHandlers/userProductHandler.js

@@ -496,13 +496,12 @@ Subcategory: ${product.subcategory_name}
         const state = userStates.get(chatId);
     
         try {
-            const user = await UserService.getUserByTelegramId(telegramId)
+            const user = await UserService.getUserByTelegramId(telegramId);
             if (!user) {
                 throw new Error('User not found');
             }
     
             const product = await ProductService.getProductById(productId);
-
             if (!product) {
                 throw new Error('Product not found');
             }
@@ -510,7 +509,24 @@ Subcategory: ${product.subcategory_name}
             const quantity = state?.quantity || 1;
             const totalPrice = product.price * quantity;
     
-            // Get user's crypto wallets with balances
+            // Проверка баланса пользователя
+            const userBalance = await UserService.getUserBalance(user.id);
+            if (userBalance < totalPrice) {
+                await bot.sendMessage(
+                    chatId,
+                    `❌ Insufficient balance. Your current balance is $${userBalance}. You need $${totalPrice} to complete this purchase.`,
+                    {
+                        reply_markup: {
+                            inline_keyboard: [[
+                                { text: '💰 Top Up Balance', callback_data: 'top_up_wallet' }
+                            ]]
+                        }
+                    }
+                );
+                return;
+            }
+    
+            // Получение криптокошельков пользователя
             const cryptoWallets = await db.allAsync(`
                 SELECT wallet_type, address
                 FROM crypto_wallets