public async Task <decimal> MinLast20DaysAsync(string symbol)
{
var rootObject = await _dataProvider.FetchDataAsync(symbol, TimePeriod.InYears(1), TimePeriod.InWeeks(1));
return(rootObject.chart.result[0].indicators.quote[0].low.Where(x => x.HasValue).Select(x => x.Value).Reverse().Take(4).Min());
}
public async Task <decimal> MaxLast10YearsAsync(string symbol)
{
var rootObject = await _dataProvider.FetchDataAsync(symbol, TimePeriod.InYears(10), TimePeriod.InMonths(1));
return(rootObject.chart.result[0].indicators.quote[0].high.Where(x => x.HasValue).Select(x => x.Value).Max());
}
public async Task <IEnumerable <Candle> > FetchCandlesAsync(string symbol, TimePeriod range, TimePeriod interval)
{
var rootObject = await FetchDataAsync(symbol, range, interval);
return(CreateCandles(rootObject));
}
public async Task <IEnumerable <decimal> > CalculateTrAsync(string symbol)
{
var candles = await _dataProvider.FetchCandlesAsync(symbol, TimePeriod.InYears(5), TimePeriod.InWeeks(1));
var calculator = new TrCalculator();
return(calculator.Calculate(candles));
}
public async Task <RootObject> FetchDataAsync(string symbol, TimePeriod range, TimePeriod interval)
{
var converter = new TimePeriodToYahooTimeConverter();
var rangeStr = converter.Convert(range);
var intervalStr = converter.Convert(interval);
var client = new RestClient(_yahooUrl);
var request = new RestRequest($"v7/finance/chart/{symbol}?range={rangeStr}&interval={intervalStr}");
Console.Error.WriteLine(client.BuildUri(request));
var taskCompletion = new TaskCompletionSource <IRestResponse>();
var handle = client.ExecuteAsync(request, r => taskCompletion.SetResult(r));
var response = await taskCompletion.Task;
if (response.StatusCode != HttpStatusCode.OK)
{
throw new Exception(response.ErrorMessage);
}
var rootObject = JsonConvert.DeserializeObject <RootObject>(response.Content);
if (!rootObject.chart.result.Any())
{
Console.WriteLine($"Symbol {symbol} does not exist");
}
return(rootObject);
}
