public Buyer(string itemId, int maximumPrice, int numberToBuy, IStockItem stockItem)
{
_numberToBuy = numberToBuy;
_maximumPrice = maximumPrice;
_stockItem = stockItem;
Snapshot = BuyerSnapshot.Joining(itemId);
}
public void ItemPurchased(int numberSold, PurchaseSource purchaseSource)
{
if (purchaseSource == PurchaseSource.FromBuyer)
{
Snapshot = Snapshot.Bought(numberSold);
if (Snapshot.BoughtSoFar >= _numberToBuy)
{
Snapshot = Snapshot.Closed();
}
NotifyChange();
}
}
public void CurrentPrice(int price, int numberInStock)
{
if (Snapshot.State == BuyerState.Closed)
{
return;
}
if (price > _maximumPrice)
{
Snapshot = Snapshot.Monitoring(price, numberInStock);
}
else
{
int numberToBuy = Math.Min(numberInStock, _numberToBuy);
_stockItem.Buy(price, numberToBuy);
Snapshot = Snapshot.Buying(price, numberInStock);
}
NotifyChange();
}
public void ItemClosed()
{
Snapshot = Snapshot.Closed();
NotifyChange();
}