public async Task <IEnumerable <Rate> > GetRateByFilterAsync(RateFilterModel filterModel)
{
if (filterModel.DateTo < filterModel.DateFrom || filterModel.DateFrom.AddMonths(2) < filterModel.DateTo)
{
throw new ArgumentException("Invalid filter model. Date range is invalid.");
}
var baseIsAvailable = await _ratesRepository.CheckAvailableBaseCurrencyAsync(filterModel.BaseCurrency.Id);
var resultsIsAvailable =
await _ratesRepository.CheckAvailableResultCurrenciesAsync(
filterModel.ResultCurrencyList.Select(x => x.Id));
if (!baseIsAvailable || !resultsIsAvailable)
{
throw new ArgumentException("Invalid filter model. Check your currency accessing.");
}
var cachingRates = await _ratesRepository.GetRatesInfoAsync(filterModel);
if (cachingRates.Count() == filterModel.ResultCurrencyList.Count() *
filterModel.DateFrom.GetBusinessDaysCount(filterModel.DateTo))
{
return(cachingRates);
}
else
{
var newRates = await GetMissingRates(filterModel, cachingRates);
await _ratesRepository.AddRangeRatesInfoAsync(newRates);
var result = cachingRates.ToList();
result.AddRange(newRates);
return(result.GroupBy(x => new { x.ResultCurrencyId, x.RateDate }).Select(x => x.First()));
}
}