public void PurchaseOnlineProducts(List <PurchaseItem> purchaseItems)
{
PriceList priceList = new PriceList();
ProductDetails productDetails = new ProductDetails();
ShoppingCart shoppingCart = new ShoppingCart();
foreach (var purchaseItem in purchaseItems)
{
var productId = productDetails.GetProductIdByCode(purchaseItem.ItemCode);
var productRate = priceList.GetRate(productId);
shoppingCart.AddProductToShoppingCart(productId, productRate, purchaseItem.ItemQty);
}
Order order = new Order();
var invoice = order.PlaceOrder(ShoppingCart.ShoppingCartItems);
InvoiceManager invoiceManager = new InvoiceManager();
invoiceManager.PrintInvoice(invoice);
}