public async Task <CurrencyRateQuery[]> GetAsync(CurrencyRateQueryDto queryDto)
{
if (queryDto.ApiKey is null)
{
throw new NullApiKeyException();
}
if (!await apiKeyService.IsApiKeyValidAsync(queryDto.ApiKey))
{
throw new InvalidApiKeyException(queryDto.ApiKey);
}
return(queryDto.CurrencyCodes
.SelectMany(currencyPair =>
{
var source = currencyPair.Key;
var target = currencyPair.Value;
var startDate = queryDto.StartDate == default ? DateTime.Today : queryDto.StartDate;
var endDate = queryDto.EndDate == default ? DateTime.Today : queryDto.EndDate;
return DateHelper.EachDay(startDate.GetRecentWorkDay(), endDate).Select(date => new CurrencyRateQuery(source, target, date));
})
.ToArray());
}
