/// <summary>
/// Performs an indirect conversion between two currencies
/// </summary>
/// <param name="sourceCurrencyCode">The source currency</param>
/// <param name="targetCurrencyCode">The target currency</param>
/// <param name="amount">The conversion amount</param>
/// <param name="date">The conversion date</param>
/// <returns>A <see cref="FXConversion"/> with the result of the conversion</returns>
private async Task <ServiceResponse <FXConversion> > ConvertIndirect(string sourceCurrencyCode, string targetCurrencyCode, decimal amount, string date)
{
var response = new ServiceResponse <FXConversion>();
var sourceToBaseRecord = await _fxServiceBackend.GetFXData(sourceCurrencyCode, _fxServiceBackend.BaseCurrencyCode, date);
if (sourceToBaseRecord == null)
{
return(response.Fail(FXErrorCode.RecordNotFoundForDate, $"No exchange rate was found for source currency '{sourceCurrencyCode}' and target currency '{_fxServiceBackend.BaseCurrencyCode}' on date '{date}'."));
}
// Convert from source to base
var sourceToBaseValue = amount * sourceToBaseRecord.ExchangeRate;
var baseToTargetRecord = await _fxServiceBackend.GetFXData(_fxServiceBackend.BaseCurrencyCode, targetCurrencyCode, date);
if (baseToTargetRecord == null)
{
return(response.Fail(FXErrorCode.RecordNotFoundForDate, $"No exchange rate was found for source currency '{_fxServiceBackend.BaseCurrencyCode}' and target currency '{targetCurrencyCode}' on date '{date}'."));
}
// Convert from base to target
var baseToTargetValue = sourceToBaseValue * baseToTargetRecord.ExchangeRate;
// Derive the exchange rate
decimal exchangeRate = Math.Round(baseToTargetValue / amount, 4);
var conversion = new FXConversion
{
SourceCurrencyCode = sourceToBaseRecord.SourceCurrencyCode,
TargetCurrencyCode = baseToTargetRecord.TargetCurrencyCode,
Amount = amount,
ExchangeRate = exchangeRate,
Value = amount * exchangeRate, // we do not use baseToTargetValue here because we rounded the exchange rate after deriving baseToTargetValue
Date = baseToTargetRecord.Date,
Direct = false
};
return(response.Succeed(conversion));
}
/// <summary>
/// Performs a direct conversion between two currencies
/// </summary>
/// <param name="sourceCurrencyCode">The source currency</param>
/// <param name="targetCurrencyCode">The target currency</param>
/// <param name="amount">The conversion amount</param>
/// <param name="date">The conversion date</param>
/// <returns>A <see cref="FXConversion"/> with the result of the conversion</returns>
private async Task <ServiceResponse <FXConversion> > ConvertDirect(string sourceCurrencyCode, string targetCurrencyCode, decimal amount, string date)
{
var response = new ServiceResponse <FXConversion>();
var fxRecord = await _fxServiceBackend.GetFXData(sourceCurrencyCode, targetCurrencyCode, date);
if (fxRecord == null)
{
return(response.Fail(FXErrorCode.RecordNotFoundForDate, $"No exchange rate was found for source currency '{sourceCurrencyCode}' and target currency '{targetCurrencyCode}' on date '{date}'."));
}
var conversion = new FXConversion
{
SourceCurrencyCode = fxRecord.SourceCurrencyCode,
TargetCurrencyCode = fxRecord.TargetCurrencyCode,
Amount = amount,
ExchangeRate = fxRecord.ExchangeRate,
Value = amount * fxRecord.ExchangeRate,
Date = fxRecord.Date,
Direct = true
};
return(response.Succeed(conversion));
}