/// <summary>
/// Swapping the Base to Transaction's currency code and convert exchange rates
/// </summary>
/// <param name="currencyCode"></param>
/// <returns></returns>
public ExchangeRatesApiResponse SwapBase(string currencyCode)
{
//TODO: Лучше бы эту логику вынести в отдельный класс, чтобы отделить
// ExchangeRatesApiResponse от класса который содердит в себе значения курсов валют
var exchangeRatesApiResponse = new ExchangeRatesApiResponse(Success, Timestamp, Base, Date, Rates);
exchangeRatesApiResponse.ConvertExchangeRates(currencyCode);
return(exchangeRatesApiResponse);
}
private static decimal GetRate(string currency, ExchangeRatesApiResponse response)
{
var currencyUpper = currency.ToUpperInvariant();
if (currencyUpper == "EUR")
{
return(1.0M);
}
if (!response.Rates.ContainsKey(currencyUpper))
{
throw new CurrencyNotSupportedException(currencyUpper);
}
return(response.Rates[currencyUpper]);
}
private CalculatedRatesDateRateResponse CreateCalculatedRatesResponse(ExchangeRatesApiResponse response,
List <DateTime> dates, string targetCurrency)
{
if (response.Rates.Count > 0)
{
var converted = new CalculatedRatesDateRateResponse();
// dictionary of user entered dates and their corresponding days with exchange rate values
Dictionary <string, string> datesDictionary = new Dictionary <string, string>();
dates.ForEach(date =>
{
DateTime dateMoved = DateTimeUtil.ChangeDateForSaturdayOrSunday(date);
datesDictionary.Add(DateTimeUtil.DateTimeToDateString(date), DateTimeUtil.DateTimeToDateString(dateMoved));
});
// filter rates only for user entered days
// maps response to <string, decimal> dictionary
var rates = response.Rates.Where(p => datesDictionary.Any(d =>
{
return(d.Key == p.Key || d.Value == p.Key);
}))
.ToDictionary(p => datesDictionary.FirstOrDefault(d => d.Value == p.Key).Key /*p.Key*/, p => (decimal)p.Value.Fields[targetCurrency])
.OrderBy(p => p.Value);
var minRate = rates.First();
var maxRate = rates.Last();
var avg = rates.Select(c => c.Value).Sum() / rates.Count();
converted.MinRate = new Rate(minRate.Key, minRate.Value); // $"A min rate of {minRate.Value} on {minRate.Key}.";
converted.MaxRate = new Rate(maxRate.Key, maxRate.Value); // $"A max rate of {maxRate.Value} on {maxRate.Key}.";
converted.AverageRate = avg; // $"An average rate of {avg}.";
return(converted);
}
else
{
throw new EmptyRatesException();
}
}
