//TotalOfItems just expects a list of scanned items' SKU codes
public decimal TotalOfItems(IEnumerable <string> items)
{
decimal totalCost = 0m;
List <Item> itemsInFull = new List <Item>();
foreach (var item in items)
{
var itemInFull = _checkoutRepository.GetItem(item);
totalCost += itemInFull.ItemPrice;
itemsInFull.Add(itemInFull);
//Consider offers on items.....
//Could put the discounting in own class/methods that can be abstracted to use for multiple types of offers/discounts
var itemSpecialOffer = _checkoutRepository.GetSpecialOffer(item);
if (itemSpecialOffer != null)
{
var sameItemsSoFar = itemsInFull.Where(i => i.SKU == item).ToList();
//If no remainder then an exact offer quantity has been matched so apply offer
if (sameItemsSoFar.Count() % itemSpecialOffer.Quantity == 0)
{
//Work out difference between cost and the special offer and apply it to totalCost
totalCost += itemSpecialOffer.OfferPrice - (itemInFull.ItemPrice * itemSpecialOffer.Quantity);
}
}
}
return(totalCost);
}
