public PromotionResult ApplyPromotion(IEnumerable <IOrderItem> orderItems)
{
var result = PromotionResult.Failure();
var skuOrderItem = GetFirstApplicableOrderItem(orderItems);
if (skuOrderItem != null)
{
var fixedPriceMultiplier = skuOrderItem.Count / _count;
var fullPriceMultiplier = skuOrderItem.Count % _count;
var adjustmentAmount = skuOrderItem.Amount - (fixedPriceMultiplier * _fixedPrice + fullPriceMultiplier * skuOrderItem.SKU.UnitPrice);
var adjustmentOrderItem = new PromotionAdjustmentOrderItem(-adjustmentAmount);
return(PromotionResult.Success(adjustmentOrderItem, new ISKU[] { skuOrderItem.SKU }));
}
return(result);
}
public PromotionResult ApplyPromotion(IEnumerable <IOrderItem> orderItems)
{ // assumption: max 1 order item per SKU
var result = PromotionResult.Failure();
var relevantOrderItems = orderItems.OfType <ISKUOrderItem>()
.Where(x => _skuIdCombination.Contains(x.SKU.ID))
.ToList();
if (relevantOrderItems.Count == _skuIdCombination.Count)
{
var combinedUnitPriceBeforeAdjustment = relevantOrderItems.Sum(x => x.SKU.UnitPrice);
var adjustment = combinedUnitPriceBeforeAdjustment - _fixedPrice;
var adjustmentItem = new PromotionAdjustmentOrderItem(-adjustment);
return(PromotionResult.Success(adjustmentItem, relevantOrderItems.Select(x => x.SKU)));
}
return(result);
}