private static Result ValdateQuery(GetConversionRateQuery query)
{
var errors = new List <string>();
if (query.TransactionAmount <= 0)
{
errors.Add("Invalid transaction amount");
}
if (string.IsNullOrWhiteSpace(query.BillingCurrency) || query.BillingCurrency.Length != 3)
{
errors.Add("Invalid billing currency");
}
if (string.IsNullOrWhiteSpace(query.TransactionCurrency) || query.TransactionCurrency.Length != 3)
{
errors.Add("Invalid transaction amount");
}
if (errors.Any())
{
return(Result.Failure(string.Join(", ", errors)));
}
return(Result.Success());
}
public async Task <Result <ConversionRateDto> > Handle(GetConversionRateQuery query)
{
var validationResult = ValdateQuery(query);
if (validationResult.IsFailure)
{
return(Result.Failure <ConversionRateDto>(validationResult.Error));
}
var fxDate = _dateTimeProvider.UtcNow.ToString("yyyy-MM-dd");
var response = await _currencyRateClient.GetConversionRate(fxDate, query.TransactionCurrency, query.BillingCurrency, query.TransactionAmount);
if (response.IsFailure())
{
return(Result.Failure <ConversionRateDto>(response.Data?.ErrorMessage));
}
var conversionRate = new ConversionRateDto
{
TransactionAmount = query.TransactionAmount,
TransactionCurrency = query.TransactionCurrency,
ConversionRate = response.Data.ConversionRate.GetValueOrDefault(),
BillingAmount = response.Data.CrdhldBillAmt.GetValueOrDefault(),
BillingCurrency = response.Data.CrdhldBillCurr
};
return(Result.Success(conversionRate));
}
