public ExchangeRate CalculateFromNationalBankRate(string foreignCurrencyISOName, decimal rate, DateTime timestampUtc)
{
Argument.NotEmpty(foreignCurrencyISOName, "foreignCurrencyISOName");
Argument.Satisfies(foreignCurrencyISOName, x => x != _settings.NationalCurrency);
Argument.Satisfies(rate, x => x > 0, "rate");
var conversionRate = new ConversionRate(new CurrencyConversion(_settings.NationalCurrency, foreignCurrencyISOName), rate);
return(CalculateFromConversionRate(conversionRate, timestampUtc, _roundingSettings.GetRounding(foreignCurrencyISOName)));
}
public ExchangeRate CalculateFromConversionRate(ConversionRate conversionRate, DateTime timstampUtc, Rounding rounding)
{
Argument.NotNull(conversionRate, "conversionRate");
var baseCurrency = _currencyRepository.Find(conversionRate.Conversion.From);
if (baseCurrency == null)
{
var message = string.Format("Can't find currency [{0}] in the database.", conversionRate.Conversion.From);
throw new InvalidOperationException(message);
}
var foreignCurrency = _currencyRepository.Find(conversionRate.Conversion.To);
if (foreignCurrency == null)
{
var message = string.Format("Can't find currency [{0}] in the database.", conversionRate.Conversion.To);
throw new InvalidOperationException(message);
}
var buyRate = MoneyMath.Round(conversionRate.Rate * (decimal)Randomizer.FromRange(_settings.BuyRateCoefficientRange), rounding);
var sellRate = MoneyMath.Round(conversionRate.Rate * (decimal)Randomizer.FromRange(_settings.SellRateCoefficientRange), rounding);
return(ExchangeRate.Create(baseCurrency, foreignCurrency, buyRate, sellRate, timstampUtc));
}