public async Task <IActionResult> GetHistoryRatesForGivenPeriodsAsync([FromBody] HistoryRatesRequest model)
{
try
{
if (model == null)
{
return(BadRequest("Argument cannot be null"));
}
var result = await _exchangeRatesManagement.GetRatesForGivenPeriodsAsync(model);
return(Ok(result));
}
catch (Exception ex)
{
_logger.LogError(ex, ex.Message);
while (ex.InnerException != null)
{
ex = ex.InnerException;
_logger.LogError(ex, ex.Message);
}
return(BadRequest(ex.Message));
}
}
private Task <HttpResponseMessage>[] CreateRequestUrls(HistoryRatesRequest request)
{
return(request
.Dates
.Select(date => _httpClient.GetAsync(
$"{_EXCHANGE_RATES_API}{date:yyyy-MM-dd}?base={request.BaseCurrency.ToUpper()}&symbols={request.TargetCurrency.ToUpper()}"))
.ToArray());
}
public async Task <ExchangeRatesResponse> GetRatesForGivenPeriodsAsync(HistoryRatesRequest request)
{
ValidateArgument(request);
var requestUrls = CreateRequestUrls(request);
var result = (await GetRatesFromApiAsync(requestUrls))
.OrderBy(x => x.Value)
.ToList();
var minimumRate = result.First();
var maximumRate = result.Last();
var averageRate = result.Average(x => x.Value);
return(new ExchangeRatesResponse(minimumRate, maximumRate, averageRate));
}
private void ValidateArgument(HistoryRatesRequest request)
{
if (request == null)
{
throw new ArgumentNullException(nameof(HistoryRatesRequest), $"Argument {nameof(request)} cannot be null");
}
CheckCurrency(request.BaseCurrency, nameof(request.BaseCurrency));
CheckCurrency(request.TargetCurrency, nameof(request.TargetCurrency));
if (string.Equals(request.BaseCurrency, request.TargetCurrency))
{
throw new CurrencyException("Base currency cannot be the same as target currency", nameof(request.BaseCurrency));
}
CheckDates(request.Dates, nameof(request.Dates));
}
