public async Task <TradeExecutionResponse> Get(string stockName)
{
var tradeExecutionResponse = new TradeExecutionResponse();
try
{
tradeExecutionResponse = await _tradeProvider.GetTrades(stockName);
}
catch (Exception ex)
{
tradeExecutionResponse.Status = "Failure";
tradeExecutionResponse.Error = new Error()
{
ErrorCode = "500",
ErrorMessage = "Internal Server Error"
};
}
return(tradeExecutionResponse);
}
public async Task <TradeExecutionResponse> GetTrades(string stockName)
{
var tradeExecutionResponse = new TradeExecutionResponse()
{
TradeExecutions = new List <TradeExecution>(), Status = "Success"
};
if (_tradeQueue.Find(x => x.Name == stockName) != null)
{
while (true)
{
try
{
if (!CanTradeBePerformed(stockName))
{
if (tradeExecutionResponse.TradeExecutions.Count == 0)
{
tradeExecutionResponse.Error = GetError("500", "No trade can be performed for Stock: " + stockName);
tradeExecutionResponse.Status = Constants.ResponseStatus.Failure;
}
break;
}
var sellRequests = _tradeQueue.FindAll(x => x.Name == stockName && x.Type == Constants.TradeType.SELL);
if (sellRequests != null && sellRequests.Count > 0)
{
sellRequests = (from sr in sellRequests orderby sr.Price select sr).ToList();
var lowestSellRequest = sellRequests[0];
var buyRequests = _tradeQueue.FindAll(x => x.Name == stockName && x.Type == Constants.TradeType.BUY);
buyRequests = (from br in buyRequests orderby br.Price descending select br).ToList();
if (buyRequests != null && buyRequests.Count > 0)
{
var highestBuyRequest = buyRequests[0];
if (lowestSellRequest.Quantity >= highestBuyRequest.Quantity && highestBuyRequest.Price >= lowestSellRequest.Price)
{
tradeExecutionResponse.TradeExecutions.Add(new TradeExecution()
{
BuyRequestId = highestBuyRequest.Id,
SellRequestId = lowestSellRequest.Id,
Price = lowestSellRequest.Price,
Quantity = highestBuyRequest.Quantity
});
_tradeQueue.Find(x => x.Id == lowestSellRequest.Id).Quantity = lowestSellRequest.Quantity - highestBuyRequest.Quantity;
_tradeQueue.Remove(highestBuyRequest);
}
else
{
if (lowestSellRequest.Price <= highestBuyRequest.Price)
{
tradeExecutionResponse.TradeExecutions.Add(new TradeExecution()
{
BuyRequestId = highestBuyRequest.Id,
SellRequestId = lowestSellRequest.Id,
Price = lowestSellRequest.Price,
Quantity = lowestSellRequest.Quantity
});
_tradeQueue.Find(x => x.Id == highestBuyRequest.Id).Quantity = highestBuyRequest.Quantity - lowestSellRequest.Quantity;
_tradeQueue.Remove(lowestSellRequest);
}
}
}
}
}
catch (Exception ex)
{
tradeExecutionResponse.Error = GetError("500", "An Error occurred while fetching trades on Stock: " + stockName);
tradeExecutionResponse.Status = Constants.ResponseStatus.Failure;
}
}
}
else
{
tradeExecutionResponse.Error = GetError("404", "No Trade Requests found for Stock: " + stockName);
tradeExecutionResponse.Status = Constants.ResponseStatus.Failure;
}
return(tradeExecutionResponse);
}