Nimesh Store Management System

@FXML
private void processPayment() {
    Invoice invoice = new Invoice();
    invoice.setDate(LocalDateTime.now());
    invoice.setCustomer(selectedCustomer);
    invoice.setTotalAmount(calculateTotal());
    
    // Apply wholesale discount if applicable
    if (selectedCustomer.getCustomerType() == CustomerType.WHOLESALE) {
        invoice.applyWholesaleDiscount();
    }
    
    // Update inventory
    cartItems.forEach(item -> {
        productService.updateStock(item.getProduct(), item.getQuantity());
    });
    
    invoiceService.save(invoice);
    smsService.sendReceipt(selectedCustomer, invoice);
}

@Service
@Transactional
public class InventoryService {
    
    @Autowired
    private ProductBatchRepository batchRepository;
    
    public void checkLowStock() {
        List lowStockProducts = productRepository
            .findByCurrentStockLessThan(reorderLevel);
            
        lowStockProducts.forEach(product -> {
            notificationService.createLowStockAlert(product);
            if (autoReorder) {
                purchaseOrderService.createReorderRequest(product);
            }
        });
    }
}