public decimal ComputePrice(PizzaOrder order)
{
decimal nonDiscounted = order.Pizzas.Sum(p => p.Price);
decimal discountedValue = _discountPolicy(order);
return(nonDiscounted - discountedValue);
}
public static decimal BuyOneGetOneFree(PizzaOrder order)
{
var pizzas = order.Pizzas;
if (pizzas.Count < 2)
{
return(0m);
}
return(pizzas.Min(p => p.Price));
}
public decimal ApplyDiscount(PizzaOrder order)
{
var pizzas = order.Pizzas;
if (pizzas.Count < 2)
{
return(0m);
}
return(pizzas.Min(p => p.Price));
}
public decimal ApplyDiscount(PizzaOrder order)
{
var discountPolicies = new List <IDiscountPolicy>()
{
new BuyOneGetOneFree(),
new FivePercentOffMoreThanFiftyDollars(),
new FiveDollarsOffStuffedCrust()
};
var bestDiscount =
discountPolicies.Max(policy => policy.ApplyDiscount(order));
return(bestDiscount);
}
public decimal ComputePrice(PizzaOrder order)
{
decimal total = order.Pizzas.Sum(p => p.Price);
decimal[] discounts = new[] {
_discountPolicyMethods.BuyOneGetOneFree(order),
_discountPolicyMethods.FivePercentOffMoreThanFiftyDollars(order),
_discountPolicyMethods.FiveDollarsOffStuffedCrust(order),
};
decimal bestDiscount = discounts.Max(discount => discount);
total = total - bestDiscount;
return(total);
}
public void Five_dollars_off_stuffed_crust()
{
var pizzaOrderingSystem = new PizzaOrderingSystemInterfaces(new BestDiscount());
var order = new PizzaOrder()
{
Pizzas = new List <Pizza>()
{
new Pizza()
{
Crust = Crust.Stuffed,
Price = 10.00m,
Size = Size.Large
}
}
};
var price = pizzaOrderingSystem.ComputePrice(order);
Assert.Equal(price, 5.00m);
}
public void Get_a_pizza_no_discount()
{
var pizzaOrderingSystem = new PizzaOrderingSystemInterfaces(new BestDiscount());
var order = new PizzaOrder()
{
Pizzas = new List <Pizza>()
{
new Pizza()
{
Crust = Crust.Regular,
Price = 10.00m,
Size = Size.Large
}
}
};
var price = pizzaOrderingSystem.ComputePrice(order);
Assert.Equal(price, 10.00m);
}
public void Five_dollars_off_stuffed_crust()
{
var pizzaOrderingSystem = new PizzaOrderingSystem(DiscountPolicyDelegates.DiscountAllThePizzas());
var order = new PizzaOrder()
{
Pizzas = new List <Pizza>()
{
new Pizza()
{
Crust = Crust.Stuffed,
Price = 10.00m,
Size = Size.Large
}
}
};
var price = pizzaOrderingSystem.ComputePrice(order);
Assert.Equal(price, 5.00m);
}
public void Get_a_pizza_no_discount()
{
var pizzaOrderingSystem = new PizzaOrderingSystem(DiscountPolicyDelegates.DiscountAllThePizzas());
var order = new PizzaOrder()
{
Pizzas = new List <Pizza>()
{
new Pizza()
{
Crust = Crust.Regular,
Price = 10.00m,
Size = Size.Large
}
}
};
var price = pizzaOrderingSystem.ComputePrice(order);
Assert.Equal(price, 10.00m);
}
public void Five_percent_off_more_than_50_policy()
{
var pizzaOrderingSystem = new PizzaOrderingSystemInterfaces(new BestDiscount());
var order = new PizzaOrder();
for (int i = 0; i < 6; i++)
{
var pizza = new Pizza()
{
Crust = Crust.Regular,
Price = 10.00m,
Size = Size.Large
};
order.Pizzas.Add(pizza);
}
var price = pizzaOrderingSystem.ComputePrice(order);
Assert.Equal(6, order.Pizzas.Count);
Assert.Equal(50.00m, price);
}
public void Buy_one_get_one_policy()
{
var pizzaOrderingSystem = new PizzaOrderingSystemInterfaces(new BestDiscount());
var order = new PizzaOrder();
for (int i = 0; i < 2; i++)
{
var pizza = new Pizza()
{
Crust = Crust.Regular,
Price = 10.00m,
Size = Size.Large
};
order.Pizzas.Add(pizza);
}
var price = pizzaOrderingSystem.ComputePrice(order);
Assert.Equal(2, order.Pizzas.Count);
Assert.Equal(10.00m, price);
}
public void Best_discount_for_big_order()
{
var pizzaOrderingSystem = new PizzaOrderingSystem(
DiscountPolicyDelegates.DiscountAllThePizzas());
var order = new PizzaOrder();
// Buy one get one
for (int i = 0; i < 2; i++)
{
var pizza = new Pizza()
{
Crust = Crust.Regular,
Price = 10.00m,
Size = Size.Large
};
order.Pizzas.Add(pizza);
}
// Over 50 5% off
for (int i = 0; i < 6; i++)
{
var pizza = new Pizza()
{
Crust = Crust.Regular,
Price = 10.00m,
Size = Size.Large
};
order.Pizzas.Add(pizza);
}
// Stuffed crust
var stuffedCrust = new Pizza()
{
Crust = Crust.Stuffed,
Price = 10.00m,
Size = Size.Large
};
order.Pizzas.Add(stuffedCrust);
var price = pizzaOrderingSystem.ComputePrice(order);
Assert.Equal(80.00m, price);
}
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);
}
public decimal ApplyDiscount(PizzaOrder order)
{
return(order.Pizzas.Sum(p => p.Crust == Crust.Stuffed ? 5m : 0m));
}
public decimal ApplyDiscount(PizzaOrder order)
{
decimal nonDiscounted = order.Pizzas.Sum(p => p.Price);
return(nonDiscounted >= 50 ? nonDiscounted * 0.05m : 0M);
}