public CurrencyConverter Create(CurrencyConversion conversion)
{
var rates = _exchangeRateRepository.GetActualForExchange(conversion.ExchangeRateKey);
if (rates.Count == 0)
{
var message = string.Format("Conversion {0} is not supported.", conversion);
throw new NotSupportedException(message);
}
if (rates.Count == 1)
{
return(rates[0].Converter);
}
var rate = rates.OrderBy(x => _settings.GetPriority(x.Base.ISOName)).First();
return(rate.Converter);
}
public void UpdateRates()
{
var nationalBankClient = new NBRBServiceClient();
try
{
var now = DateTime.UtcNow;
var currencies = _deps.Currencies.FindAll();
var nationalCurrency = currencies.First(x => x.ISOName == _settings.NationalCurrency);
var foreignCurrencies = currencies.Except(new[] { nationalCurrency }).ToList();
var nationalBankRates = nationalBankClient.GetLatestRates()
.Where(x => foreignCurrencies.Any(f => f.ISOName == x.Conversion.To))
.ToList();
var commercialRates = nationalBankRates
.Select(x => _deps.ExchangeRateCalculator.CalculateFromNationalBankRate(x.Conversion.To, x.Rate, now))
.ToDictionary(x => x.Foreign.ISOName, x => x);
var foreignCurrenciesIds = foreignCurrencies.Select(x => x.ISOName).ToList();
var pairs = from id1 in foreignCurrenciesIds
from id2 in foreignCurrenciesIds
select new { id1, id2 };
var crossConversions = pairs.Where(x => x.id1 != x.id2)
.Select(x => new CurrencyConversion(x.id1, x.id2))
.OrderBy(x => _settings.GetPriority(x.From))
.DistinctBy(x => x.ExchangeRateKey)
.ToList();
var crossRates = crossConversions
.Select(x => _deps.ExchangeRateCalculator.CalculateCrossRate(commercialRates[x.From], commercialRates[x.To], now))
.ToList();
var allRates = commercialRates.Values.Concat(crossRates).ToList();
allRates.ForEach(_deps.ExchangeRates.Save);
Commit();
}
catch (Exception ex)
{
throw new ServiceException("Can't update currency rates.", ex);
}
finally
{
nationalBankClient.Dispose();
}
}
