public override void Apply(Order order)
{
var numberOfApplicableBundles = BaseProducts
.Select(b => Convert.ToInt32(order.ProductQuantity(b.Product) / b.Quantity))
.Min();
foreach (var addition in AdditionProducts)
{
var actualQuantity = order.ProductQuantity(addition.Product);
if (actualQuantity == 0)
{
continue;
}
var applicableQuantity = numberOfApplicableBundles * addition.Quantity;
//
// number of addition products in order can be bigger or lesser
// than according to number of applicable items
//
var adjustmentQuantity = Math.Min(actualQuantity, applicableQuantity);
string item = string.Format(
"{0}% off on '{1}' (bundle {2})",
addition.PercentOff, addition.Product, GetShortBundleDescr());
decimal price = order.ItemsWithProduct(addition.Product).First().PricePerUnit;
order.AddItem(item).Quantity(adjustmentQuantity)
.PricePerUnit(-price * addition.PercentOff / 100);
}
}
public string GetShortBundleDescr()
{
string bundleBase = BaseProducts
.Select(b => b.Quantity + " " + b.Product)
.Aggregate((x, y) => x + ", " + y);
string bundleAddition = AdditionProducts
.Select(a => a.PercentOff + "% off on " + a.Quantity + " " + a.Product)
.Aggregate((x, y) => x + ", " + y);
return(string.Format("[{0}] => [{1}]", bundleBase, bundleAddition));
}
