public Receipt GetPromotion(Receipt receipt)
{
var receiptItems = receipt.ReceiptItems;
Promotion[] promotions =
m_promotionRepository.GetPromotionByBarcodes(
receiptItems.Select(r => r.Product.Barcode).ToArray());
Receipt finalReceipt = new Receipt(receiptItems.Select(
r =>
new ReceiptItem(r.Product,
r.Amount,
CalculateSinglePromoted(
promotions.Where(p => p.BarCode == r.Product.Barcode).Select(p => p.Type).ToArray(),
r))).ToArray());
decimal additionPromoted = CalculateTotalPromoted(finalReceipt, promotions);
finalReceipt.Promoted += additionPromoted;
finalReceipt.Total -= additionPromoted;
return finalReceipt;
}
decimal CalculateTotalPromoted(Receipt receipt, Promotion[] promotions)
{
string[] barcodes =
promotions.Where(p => p.Type == "BUY_ONE_HUNDRED_CUT_FIFTY")
.Select(p => p.BarCode)
.ToArray();
decimal totalAfterPromoted = receipt.ReceiptItems.Where(r => barcodes.Contains(r.Product.Barcode))
.Select(r => (r.Total - r.Promoted)).Sum();
return (int)(totalAfterPromoted/100)*50;
}