public Transaction SetDeal(Transaction deal)
{
Transaction result = null;
decimal totalPrice = Quantity * Price;
decimal done = Deals.Select(it => it.Quantity * it.Price).Sum();
decimal left = totalPrice - done;
decimal required = deal.Quantity * deal.Price;
if (left >= required)
{
deal.MainTransactionId = TransactionId;
deal.SetTransactionComplete();
Deals.Add(deal);
}
else
{
int leftQuantity = Quantity - Deals.Sum(it => it.Quantity);
Transaction part = new Transaction(TransactionId,
deal.Initials,
deal.Type,
deal.Price,
true,
leftQuantity);
Deals.Add(part);
result = new Transaction(deal.Initials,
deal.Type,
deal.Price,
(deal.Quantity - leftQuantity));
}
CheckCompletion();
return(result);
}