private void CalculateBuyProductGetDiscountOnSecondProductOffer(Product product, SpecialOffer offer, Basket basket, Guid transactionId)
{
_logger.LogInformation($"{transactionId} - Calculating BuyProductGetDiscountOnSecondProductOffer for {product.ProductName}");
int primaryItemCount;
int SecondaryItemCount;
primaryItemCount = basket.BasketItems[product];
var secondaryProduct = basket.BasketItems.Keys.Where(k => k.ProductName == offer.SecondaryProduct).SingleOrDefault();
if (secondaryProduct != null)
{
SecondaryItemCount = basket.BasketItems[secondaryProduct];
// keep calculating offers until we run out of products that match
while (primaryItemCount >= offer.PrimaryProductCount && SecondaryItemCount > 0)
{
var totalDiscount = secondaryProduct.UnitPrice * ((float)offer.PercentageDiscount / 100);
basket.AddOffer((int)totalDiscount
, $"Buy {offer.PrimaryProductCount} {product.ProductName}, get {offer.PercentageDiscount}% off {secondaryProduct.ProductName}: -{totalDiscount}p");
primaryItemCount -= offer.PrimaryProductCount;
SecondaryItemCount--;
}
}
}
/// <summary>
/// Calculate Percentage discount offers - A multibuy offer is one in which one or more of a single product
/// </summary>
/// <param name="product"></param>
/// <param name="offer"></param>
/// <param name="basket"></param>
/// <param name="transactionId"></param>
private void CalculatePercentageDiscount(Product product, SpecialOffer offer, Basket basket, Guid transactionId)
{
_logger.LogInformation($"{transactionId} - Calculating Percentage discount offer for {product.ProductName}");
if (DateTime.Now < offer.ExpiryDate)
{
var itemCount = basket.BasketItems[product];
var totalDiscount = itemCount * product.UnitPrice * ((float)offer.PercentageDiscount / 100);
basket.AddOffer((int)totalDiscount, $"{product.ProductName} {offer.PercentageDiscount}% off: -{totalDiscount}p");
}
}