public async Task <ExchangeRatesResult> GetExchangeRates(ExchangeRatesRequest request)
{
ValidateCurrencies(request.BaseCurrency, request.TargetCurrency);
ValidateDates(request.Dates);
var tasks = request.Dates.Select(date => _connector.GetExchangeRate(date, request.BaseCurrency, request.TargetCurrency));
var exchangeRatesResponses = await Task.WhenAll(tasks);
var dateRateList = exchangeRatesResponses.Select(x => new { x.Date, Rate = x.Rates.First().Value })
.OrderBy(x => x.Rate)
.ToList();
var minRate = dateRateList.First();
var maxRate = dateRateList.Last();
var average = dateRateList.Average(x => x.Rate);
var minRateDate = new RateOnDate {
Rate = minRate.Rate, Date = minRate.Date
};
var maxRateDate = new RateOnDate {
Rate = maxRate.Rate, Date = maxRate.Date
};
return(new ExchangeRatesResult(minRateDate, maxRateDate, average));
}
public ExchangeRatesResult(RateOnDate minRate, RateOnDate maxRate, decimal averageRate)
{
MinRate = minRate;
MaxRate = maxRate;
AverageRate = averageRate;
}
