private string GetStockValuation(double stockPrice, List <MedpsGurufocusModel> stockPriceList)
{
MedpsGurufocusModel nearestPredictedPrice = stockPriceList.First(x => x.PriceDate > DateTime.Today);
MedpsGurufocusModel lastPrice = stockPriceList.Last(x => x.PriceDate <= DateTime.Today);
double avgPriceChange = (nearestPredictedPrice.PriceValue - lastPrice.PriceValue) / (nearestPredictedPrice.PriceDate - lastPrice.PriceDate).Days;
double expectedTodayPrice = lastPrice.PriceValue + avgPriceChange * (DateTime.Today - lastPrice.PriceDate).Days;
double difference = Math.Abs((expectedTodayPrice - stockPrice) / stockPrice) * 100;
string stockValuation = string.Empty;
if (difference < 5)
{
stockValuation = "Справедливо оценена";
}
else if (difference < 20)
{
stockValuation = (stockPrice < expectedTodayPrice) ? "Недооценена" : "Переоценена";
}
else
{
stockValuation = (stockPrice < expectedTodayPrice) ? "Сильно недооценена" : "Сильно переоценена";
}
return(stockValuation);
}
private bool CheckConditions(Company company, List <MedpsGurufocusModel> stockPriceList)
{
var culture = new CultureInfo("ru-RU");
bool firstCondition = (
company.Status == "Справедливо оценена" ||
company.Status == "Недооценена" ||
company.Status == "Сильно недооценена");
bool secondCondition = false;
MedpsGurufocusModel lastPredictedPrice = stockPriceList.Last();
double yearsDifference = (lastPredictedPrice.PriceDate - DateTime.Today).TotalDays / 365;
double priceDifference = (lastPredictedPrice.PriceValue - company.Price) / company.Price * 100;
switch (company.Category)
{
case "growrecommendations":
if (lastPredictedPrice.PriceValue > company.Price && (priceDifference / yearsDifference) >= 15)
{
secondCondition = true;
}
break;
case "dividends":
case "biotech":
if (lastPredictedPrice.PriceValue > company.Price)
{
secondCondition = true;
}
break;
default:
break;
}
company.FutureForecast = new StockFutureForecast
{
PriceDifference = (int)priceDifference,
Date = lastPredictedPrice.PriceDate.ToString("MMMM yyyy", culture)
};
return(firstCondition && secondCondition);
}
private async Task <List <MedpsGurufocusModel> > GetStockPriceList(string stockId)
{
var stockPriceList = new List <MedpsGurufocusModel>();
string result = await SendWebRequest($"https://www.gurufocus.com/reader/_api/chart/{stockId}/valuation");
JsonElement root = GetJsElemFromString(result);
try
{
// medps - это массив вида [[String date1, Double price1],...,[String dateN, Double priceN]],
// хранящий цены акции в прошлом и прогнозируемые цены в будущем
// он есть не для всех акций, поэтому тут может возникнуть KeyNotFoundException
JsonElement medps = root.GetProperty("medps");
// преобразуем medps в удобную форму
foreach (JsonElement stockPriceArray in medps.EnumerateArray())
{
var medpsModel = new MedpsGurufocusModel();
foreach (JsonElement stockPrice in stockPriceArray.EnumerateArray())
{
if (stockPrice.ValueKind == JsonValueKind.String)
{
medpsModel.PriceDate = DateTime.Parse(stockPrice.GetString());
}
else
{
medpsModel.PriceValue = stockPrice.GetDouble();
}
}
stockPriceList.Add(medpsModel);
}
}
catch (KeyNotFoundException)
{
// вернем пустой список в случае отсутствия medps
return(new List <MedpsGurufocusModel>());
}
return(stockPriceList);
}
