public async Task <IEnumerable <StockAnnualizedReturn> > GetAnnualizedReturnForCurrentHoldings(ulong userId, uint?monthsSincePurchase)
{
var toDate = monthsSincePurchase == null ? DateTime.MaxValue : DateTime.Today.AddMonths((int)-monthsSincePurchase);
var currentHoldings = await _stockHoldingService.GetAllHoldingsForUser(userId);
var purchaseIds = ExtractPurchaseIds(currentHoldings);
var purchaseTask = _stockPurchaseService.GetPurchasesByIdFilteredByDates(userId, purchaseIds, DateTime.MinValue, toDate);
var purchases = await purchaseTask;
var stockIds = FilterStockIds(purchases, currentHoldings);
var stockTask = _stockService.GetStocksById(userId, stockIds);
var stocks = await stockTask;
var tickers = stocks.Select(x => x.Ticker);
var stockQuotesTask = _marketDataService.GetLastStockQuote(tickers);
var stockQuotes = await stockQuotesTask;
var stockReturnModel = BuildStockReturnModel(stocks.ToDictionary(x => x.StockId),
purchases.ToDictionary(x => x.PurchaseId),
stockQuotes.ToDictionary(x => x.Symbol),
currentHoldings);
ComputeAnnualizedReturn(stockReturnModel);
stockReturnModel = stockReturnModel.OrderByDescending(x => x.AnnualizedReturn);
return(stockReturnModel);
}
private Task <IEnumerable <Purchase> > GetPurchases(ulong userId,
IEnumerable <ulong> purchaseIds,
DateTime from,
DateTime to)
{
if (from != DateTime.MinValue && to != DateTime.MinValue && from <= to)
{
return(_stockPurchaseService.GetPurchasesByIdFilteredByDates(userId, purchaseIds, from, to));
}
else
{
return(_stockPurchaseService.GetPurchasesById(userId, purchaseIds));
}
}