/// <summary>
/// <see cref="ICheckout.GetTotalPrice"/>
/// </summary>
/// <returns>The total price of scanned products including special offers.</returns>
public int GetTotalPrice()
{
int totalPrice = 0;
IList <Product> processedProducts = new List <Product>();
foreach (KeyValuePair <string, IList <string> > products in this.scannedProducts)
{
Product productMaster = this.productInventory.Get(products.Key);
MultiDeal multiDealMaster = productMaster.MultiDeal;
int productsCount = products.Value.Count;
if (productMaster.IsMultiDealValid(DateTime.Now))
{
while (productsCount >= multiDealMaster.Units)
{
totalPrice += multiDealMaster.MultiDealPrice;
productsCount -= multiDealMaster.Units;
}
}
while (productsCount > 0)
{
totalPrice += productMaster.Price;
productsCount -= 1;
}
}
return(totalPrice);
}
/// <summary>
/// Constructor for a Product with optional MultiDeal reference
/// (defaults to a non-valid instance).
/// </summary>
/// <param name="sku">The SKU of the product.</param>
/// <param name="price">The price of the product.</param>
/// <param name="multiDeal">The (optional) MultiDeal of the product.</param>
public Product(string sku, int price, MultiDeal multiDeal = null)
{
this.Sku = string.IsNullOrEmpty(sku) ? throw new ArgumentNullException(nameof(sku)) : sku;
this.Price = price > 1 ? price : throw new ArgumentException("Price must be greater than zero.");
this.MultiDeal = multiDeal == null ? new MultiDeal() : multiDeal;
}