/// <summary>
///
/// </summary>
/// <param name="fromDate"></param>
/// <param name="toDate"></param>
/// <param name="mode"></param>
/// <returns></returns>
/// <exception cref="ArgumentException">Throw if fromDate is greater than startDate</exception>
public async Task <IEnumerable <OpenExchangeRateResult> > GetExchangeRateHistoryPeriod(DateTime fromDate, DateTime toDate, PeriodMode mode = PeriodMode.Monthly)
{
if (fromDate >= toDate)
{
throw new ArgumentException("fromDate cannot be greater than toDate", nameof(fromDate));
}
if (mode == PeriodMode.Monthly)
{
fromDate = GetMidMonthDay(fromDate);
}
var allTasks = new List <Task <OpenExchangeRateResult> >();
while (fromDate <= toDate)
{
allTasks.Add(GetExchangeRateHistory(fromDate));
fromDate = mode == PeriodMode.Monthly ? fromDate.AddMonths(1) : fromDate.AddDays(1);
}
return(await Task.WhenAll(allTasks));
}
/// <summary>
///
/// </summary>
/// <param name="fromDate"></param>
/// <param name="toDate"></param>
/// <param name="mode"></param>
/// <param name="overrideCache"></param>
/// <returns></returns>
/// <exception cref="NotEnoughSampleException">Throw if sample return is less than 2 items.</exception>
public async Task <IEnumerable <OpenExchangeRateResult> > FetchSampleData(DateTime fromDate, DateTime toDate, PeriodMode mode = PeriodMode.Monthly, bool overrideCache = false)
{
if (!overrideCache && _cache.InMemoryData.Any())
{
return(_cache.InMemoryData);
}
var result = await _openExchangeClient.GetExchangeRateHistoryPeriod(fromDate, toDate, mode);
if (result.Count() < 2)
{
throw new NotEnoughSampleException();
}
_cache.InMemoryData.AddRange(result);
return(result);
}