/// <summary>
/// Attempts to sell stocks from the portfolio.
/// </summary>
/// <exception cref="InsufficientStocksException"> Thrown if there aren't enough stocks to sell. </exception>
/// <param name="tick"></param>
/// <param name="quantity"></param>
/// <param name="prices"></param>
/// <returns></returns>
public decimal SellStock(Ticker tick, int quantity, Dictionary <Ticker, decimal> prices)
{
if (stocks.Where(x => x.stockTicker.name == tick.name).Sum(x => x.quantity) < quantity)
{
throw new InsufficientStocksException();
}
decimal gains = 0m;
int i = 0;
while (quantity > 0)
{
if (stocks[i].stockTicker.name != tick.name)
{
i++;
}
if (stocks[i].quantity <= quantity)
{
quantity -= stocks[i].quantity;
gains += (prices[tick] - stocks[i].priceAtPurchase) * stocks[i].quantity;
stocks.RemoveAt(i); // No need to increment i
}
else
{
int newQuantity = stocks[i].quantity - quantity;
gains += (prices[tick] - stocks[i].priceAtPurchase) * quantity;
stocks[i] = new StockCollection(stocks[i].stockTicker, newQuantity, stocks[i].priceAtPurchase);
}
}
realizedGains += gains;
return(gains);
}
/// <summary>
/// Adds purchase to stock history.
/// </summary>
/// <param name="tick"> The ticker of the stock purchase. </param>
/// <param name="quantity"> The quantity of the stock to buy. </param>
/// <param name="prices"> The price of the stock. </param>
public void BuyStock(Ticker tick, int quantity, Dictionary <Ticker, decimal> prices)
{
StockCollection purchase = new StockCollection(tick, quantity, prices[tick]);
stocks.Add(purchase);
}