public decimal ComputePrice(PizzaOrder order)
{
decimal nonDiscounted = order.Pizzas.Sum(pizza => pizza.Price);
decimal discountValue = discountPolicy(order);
return(nonDiscounted - discountValue);
}
public static decimal BuyOneGetOneFree(PizzaOrder order)
{
var pizzas = order.Pizzas;
if (pizzas.Count < 2)
{
return(0m);
}
return(pizzas.Min(pizza => pizza.Price));
}
public static decimal FiveDollarsOffStuffedCrust(PizzaOrder order)
{
return(order.Pizzas.Sum(pizza => pizza.Crust == Crust.Stuffed ? 5m : 0m));
}
public static decimal FivePercentOffMoreThanFiftyDollars(PizzaOrder order)
{
decimal nonDiscounted = order.Pizzas.Sum(pizza => pizza.Price);
return(nonDiscounted >= 50 ? nonDiscounted * 0.05m : 0m);
}
public decimal ComputePolicy(PizzaOrder order)
{
return(policies.Max(policy => policy.Invoke(order)));
}