public async Task <CurrencyInfo> GetSeriesOfLatestExchangeRates(string currencyCode,
int topCount = 1)
{
if (topCount < 1 || topCount > GetSeriesOfExchangeRatesTopCount)
{
throw new ArgumentException(
$"Wrong number of exchange rates to download. Number should be between 1 and {GetSeriesOfExchangeRatesTopCount}");
}
HttpResponseMessage response = await httpClient.GetAsync($"exchangerates/rates/c/{currencyCode}/last/{topCount}/");
CurrencyInfo currencyData = null;
if (response.IsSuccessStatusCode)
{
string body = await response.Content.ReadAsStringAsync();
ApiCurrency apiData = JsonConvert.DeserializeObject <ApiCurrency>(body);
CurrencyProcessor currencyProcessor = new CurrencyProcessor(apiData);
currencyData = new CurrencyInfo(currencyProcessor);
}
return(currencyData);
}
public CurrencyProcessor(ApiCurrency apiCurrencyData)
{
Code = apiCurrencyData.Code;
Name = apiCurrencyData.Name;
StartDate = apiCurrencyData.ExchangeRates.First().EffectiveDate;
EndDate = apiCurrencyData.ExchangeRates.Last().EffectiveDate;
ExchangeRates = apiCurrencyData.ExchangeRates;
}
public async Task <CurrencyInfo> GetSeriesOfExchangeRatesFromGivenPeriod(string currencyCode,
DateTime startDate,
DateTime endDate)
{
if (startDate > endDate) // swap dates if start date is greater than end date
{
DateTime temp = startDate;
startDate = endDate;
endDate = temp;
}
if (startDate < CurrencyExchangeRatesCollectionStartDate)
{
throw new ArgumentException(
$"Start date cannot be earlier than {CurrencyExchangeRatesCollectionStartDate: d}");
}
if (endDate > DateTime.Now)
{
throw new ArgumentException($"End date cannot be later than current date");
}
TimeSpan givenPeriod = endDate - startDate;
if (givenPeriod.Days > MaximumNumberOfDaysForDownloadingData)
{
throw new ArgumentException($"Given period cannot exceed {MaximumNumberOfDaysForDownloadingData} days");
}
HttpResponseMessage response = await httpClient.GetAsync(
$"exchangerates/rates/c/{currencyCode}/{startDate: yyyy-MM-dd}/{endDate: yyyy-MM-dd}/");
CurrencyInfo currencyData = null;
if (response.IsSuccessStatusCode)
{
string body = await response.Content.ReadAsStringAsync();
ApiCurrency apiData = JsonConvert.DeserializeObject <ApiCurrency>(body);
CurrencyProcessor currencyProcessor = new CurrencyProcessor(apiData);
currencyData = new CurrencyInfo(currencyProcessor);
}
return(currencyData);
}
