public decimal CalculatePrice(PizzaOrder order)
{
decimal actualPrice = order.Pizzas.Sum(p => p.Price);
decimal discountedPrice = _discountPoilcy(order);
return(actualPrice - discountedPrice);
}
public static decimal BuyOneGetOneFree(PizzaOrder order)
{
var pizzas = order.Pizzas;
if (pizzas.Count < 2)
{
return(0m);
}
return(pizzas.Min(p => p.Price));
}
static void Main(string[] args)
{
PizzaOrder order = new PizzaOrder();
order.Pizzas = new List <Pizza> {
new Pizza {
Size = Size.LARGE, Crust = Crust.STUFFED, Price = 18.25m
},
new Pizza {
Size = Size.MEDIUM, Crust = Crust.THIN, Price = 18.25m
}
};
PizzaOrderingSystem prepareOrder = new PizzaOrderingSystem(Policies.BuyOneGetOneFree);
Console.WriteLine(prepareOrder.CalculatePrice(order).ToString());
Console.Read();
}
public decimal ComputePolicy(PizzaOrder order)
{
return(_discountPoilcies.Max(policy => policy.Invoke(order)));
}
public static decimal FiveDollarsOffStuffedCrust(PizzaOrder order)
{
return(order.Pizzas.Sum(p => p.Crust == Crust.STUFFED ? 5m : 0m));
}
public static decimal FivePercentOffMoreThanFiftyDollars(PizzaOrder order)
{
decimal nonDiscounted = order.Pizzas.Sum(p => p.Price);
return(nonDiscounted > 50 ? nonDiscounted * 0.05m : 0m);
}