private static void CalculateOppositePairsAndAddToList(ref List <APICurrencyRates> rates)
{
foreach (APICurrencyRates cr in rates.ToList())
{
if (!rates.Any(r => r.CurrencyCdFrom == cr.CurrencyCdTo && r.CurrencyCdTo == cr.CurrencyCdFrom))
{
APICurrencyRates ocr = new APICurrencyRates(cr.CurrencyCdTo, cr.CurrencyCdFrom, cr.Delimiter)
{
Rate = 1 / cr.Rate
};
rates.Add(ocr);
}
}
}
private static void GetRatesFromAPI(ref List <APICurrencyRates> rates, Sources source)
{
List <APICurrencyRates> ratesToCycle = rates.ToList();
foreach (APICurrencyRates r in ratesToCycle)
{
APICurrencyRates actualRate = rates.SingleOrDefault(ar => ar.CurrencyCdFrom == r.CurrencyCdFrom && ar.CurrencyCdTo == r.CurrencyCdTo);
if (actualRate != null && actualRate.Rate == 0) //if we haven't determined a rate for this yet
{
//get rate from api
if (source == Sources.Yahoo)
{
APIHandlers.YahooAPIHandler yahooAPI = new APIHandlers.YahooAPIHandler();
actualRate.Rate = yahooAPI.GetRate(r.CurrencyCdFrom, r.CurrencyCdTo);
}
else if (source == Sources.Cryptonator)
{
}
else
{
throw new NotSupportedException("The source provided is not a supported currency source.");
}
//then see if we can calculate any from this call using cross rates (requires at least two mappings with the same from currency) This keeps the api calls down
if (rates.Any(ra => ra.CurrencyCdFrom == r.CurrencyCdFrom && ra.Rate > 0))
{
List <APICurrencyRates> otherRatesFound = rates.Where(r2 => r2.CurrencyCdFrom == r.CurrencyCdFrom && r2.Rate != 0).ToList();
IEnumerable <APICurrencyRates> ratesToCalc = rates.Where(r3 => otherRatesFound.Any(or => or.CurrencyCdTo == r3.CurrencyCdFrom) && r3.Rate == 0);
foreach (APICurrencyRates rc in ratesToCalc.ToList())
{
APICurrencyRates rate1 = rates.SingleOrDefault(r11 => r11.CurrencyCdFrom == r.CurrencyCdFrom && r11.CurrencyCdTo == rc.CurrencyCdTo);
APICurrencyRates rate2 = rates.SingleOrDefault(r12 => r12.CurrencyCdFrom == r.CurrencyCdFrom && r12.CurrencyCdTo == rc.CurrencyCdFrom);
if (rate1 != null && rate2 != null && rate1.Rate != 0 && rate2.Rate != 0) //if we somehow found a bad rate, don't use it
{
rc.Rate = rate1.Rate * (1 / rate2.Rate);
}
}
}
}
}
}
private static List <APICurrencyRates> CreateCurrencyPairsForAPICall(Sources source)
{
CurrencySourceLists sourceList = new CurrencySourceLists(true);
IEnumerable <string> toRates;
List <APICurrencyRates> rateList = new List <APICurrencyRates>();
foreach (CurrencySource cs in sourceList.FullCurrencyList)
{
toRates = sourceList.GetListOfToCurrencies(cs.SourceFrom).Select(c => c.CurrencyCd);
foreach (string cd in toRates)
{
if (!rateList.Any(cr => (cr.CurrencyCdFrom == cs.CurrencyCd && cr.CurrencyCdTo == cd) || (cr.CurrencyCdFrom == cd && cr.CurrencyCdTo == cs.CurrencyCd)))
{
APICurrencyRates acr = new APICurrencyRates(cs.CurrencyCd, cd, SourceDelimiters[(int)source]);
rateList.Add(acr);
}
}
}
return(rateList);
}
