public static PromoPackage GetPromoPackage(Order order)
{
foreach (PromoPackage promoPackage in promoPackages)
{
if (promoPackage.IsEligible(order))
{
return promoPackage;
}
}
return null;
}
private int CalculateDiscount(Order order)
{
if (!Inventory.IsPromoOrder(order))
{
return 0;
}
PromoPackage promoPackage = Inventory.GetPromoPackage(order);
return promoPackage.CaclulateDiscount();
}
public bool CustomerBuysBooksWithTitle(string customerName, int amount, String title)
{
Domain.Books.Book book = Inventory.FindByTitle(title);
Domain.Customers.Customer customer = CustomerRepository.FindByName(customerName);
var order = new Order(customer);
order.AddBook(amount, book);
bookService.BuyBooks(order);
return true;
}
public void BuyBooks(Order order)
{
int discount = CalculateDiscount(order);
order.ApplyDiscount(discount);
// Then deduct the inventory
foreach (Book book in order.Books)
{
int amount = order.GetAmount(book);
Inventory.DeductInventory(book, amount);
}
}
public bool IsEligible(Order order)
{
return order.ContainsBook(book1) && order.ContainsBook(book2);
}
public static bool IsPromoOrder(Order order)
{
foreach (PromoPackage promoPackage in promoPackages)
{
if (promoPackage.IsEligible(order))
{
return true;
}
}
return false;
}