public static List <ExchangeRateBO> GenerateExchangeRates(DateTime targetDate, List <decimal> rates)
{
var samples = new List <ExchangeRateBO>();
DateTime date;
ExchangeRateBO exchangeRateItem;
for (var i = 1; i < 13; i++)
{
date = targetDate.AddMonths(-1 * i);
Dictionary <string, decimal> ratesMap = new Dictionary <string, decimal>
{
{ "TRY", rates[i - 1] }
};
exchangeRateItem = new ExchangeRateBO(
date,
rates: ratesMap);
samples.Add(exchangeRateItem);
}
return(samples);
}
private void SetAmountByCurrency(Currency currency)
{
if (currency == null)
{
return;
}
//Get default currency
CurrencyBO currencyBO = new CurrencyBO();
CurrencyType defaultCurrencyType = currencyBO.GetDefaultCurrencyType(session);
//If selected currency has type is default type
if (defaultCurrencyType.Equals(currency.CurrencyTypeId))
{
spinExchangeRate.Number = 1;
}
else
{
ExchangeRateBO exchangeRateBO = new ExchangeRateBO();
ExchangeRate exchangeRate = exchangeRateBO.GetLatest(session, currency.CurrencyId);
if (exchangeRate != null)
{
spinExchangeRate.Number = (decimal)exchangeRate.Rate;
if (spinAmount.Number >= 0 && spinExchangeRate.Number >= 0)
{
spinConvertedAmount.Number = spinAmount.Number * spinExchangeRate.Number;
number = spinExchangeRate.Number.ToString();
}
else
{
spinConvertedAmount.Text = null;
}
}
else
{
spinExchangeRate.Text = null;
spinConvertedAmount.Text = null;
}
}
}
public async Task PredictShouldCorrect()
{
var targetDate = new DateTime(2017, 1, 15);
var numOfSamples = 12;
var baseCurrency = "USD";
var targetCurrency = "TRY";
var timeSeries = Enumerable.Range(1, numOfSamples).Select(t => targetDate.AddMonths(-t));
var rates = new List <decimal>
{
3.043590m, 2.945926m, 2.893866m,
2.854589m, 2.970913m, 2.925991m,
2.990882m, 2.944941m, 2.970704m,
3.089218m, 3.284672m, 3.503773m
};
rates.Reverse();
var timeSeriesGenerator = new Mock <ITimeSeriesService>();
var exchangeRatesResource = new Mock <IExchangeRateSourceService>();
var regressionEquationFactory = new Mock <IRegressionFomularRepository>();
IExchangeRatePredictService predictor = new ExchangeRatePredictService(
timeSeriesGenerator.Object,
exchangeRatesResource.Object,
regressionEquationFactory.Object);
timeSeriesGenerator
.Setup(t => t.MoveBackwardByMonth(targetDate, numOfSamples, false))
.Returns(timeSeries);
foreach (var date in timeSeries)
{
var exchangeRate = new ExchangeRateBO
{
Base = baseCurrency,
TimeStamp = date,
Rates = new Dictionary <string, decimal> {
{ targetCurrency, rates[date.Month - 1] }
}
};
var exR = exchangeRatesResource.Setup(t =>
t.GetHistorical(new Models.API.ExchangeRateRequest
{
Date = date,
Base = It.IsAny <string>(),
TargetCurrencies = It.IsAny <string[]>(),
}, It.IsAny <CancellationToken>()));
exR.ReturnsAsync(exchangeRate);
}
regressionEquationFactory
.Setup(t => t.Create(It.IsAny <List <DataPoint2dBO> >()))
.Returns(new RegressionFomularBO(0.035126416m, 2.806600379m));
decimal expectedResult = 3.263m;
var result = await predictor.PredictAsync("USD", "TRY", targetDate, numOfSamples);
result.AlmostEquals(expectedResult, 3).Should().BeTrue();
}