internal async Task <MetalCurrencyCombined> GetMetalPricesInCurrency(
Currency currency,
Metal metal,
DateTime start,
DateTime end)
{
//sets up order of execution
var filters = new List <IFilter>
{
(IFilter)_serviceProvider.GetService(typeof(RequesterFilter)),
(IFilter)_serviceProvider.GetService(typeof(FillerFilter)),
(IFilter)_serviceProvider.GetService(typeof(MetalCurrencyConverterFilter))
};
var metalCurrencyCombined = new MetalCurrencyCombined
{
Currency = currency,
Metal = metal,
Start = start,
End = end,
OperationStatus = new StringBuilder()
};
try
{
metalCurrencyCombined = filters.Aggregate(metalCurrencyCombined,
(current, operation) => operation.Execute(current));
}
catch (Exception e)
{
metalCurrencyCombined.OperationStatus.AppendLine(e.Message);
}
return(metalCurrencyCombined);
}
public MetalCurrencyCombined Execute(MetalCurrencyCombined metalCurrencyCombined)
{
if (metalCurrencyCombined.Start >= metalCurrencyCombined.End)
{
throw new Exception("start date must be before end date");
}
//unknow in which currency metal service is going to provide data
metalCurrencyCombined.MetalPrices = GetMetalPrices(
metalCurrencyCombined.Metal,
metalCurrencyCombined.Start,
metalCurrencyCombined.End)
.Result;
metalCurrencyCombined.OperationStatus.AppendLine("loaded metal prices");
//need to get exchange rate to calculate metal price in different currency
if (metalCurrencyCombined.MetalPrices.Currency != metalCurrencyCombined.Currency)
{
metalCurrencyCombined.CurrencyRates = GetCurrencyRates(
metalCurrencyCombined.MetalPrices.Currency,
metalCurrencyCombined.Currency,
metalCurrencyCombined.Start,
metalCurrencyCombined.End)
.Result;
metalCurrencyCombined.OperationStatus.AppendLine("loaded currency exchanges");
}
else
{
metalCurrencyCombined.OperationStatus.AppendLine("no need to load currency");
}
if (metalCurrencyCombined.MetalPrices == null)
{
throw new Exception("metal data not provided");
}
//currency exchange rates can be null if metal is already in expected currency
if (metalCurrencyCombined.MetalPrices.Currency != metalCurrencyCombined.Currency &&
metalCurrencyCombined.CurrencyRates == null)
{
throw new Exception("currency data not provided when needed");
}
return(metalCurrencyCombined);
}
public MetalCurrencyCombined Execute(MetalCurrencyCombined metalCurrencyCombined)
{
var metalPricesFilled =
FillMissingDates(metalCurrencyCombined.MetalPrices.Prices,
metalCurrencyCombined.Start, metalCurrencyCombined.End);
metalCurrencyCombined.MetalPrices.Prices = metalPricesFilled;
if (metalCurrencyCombined.CurrencyRates != null)
{
var currencyRatesFilled =
FillMissingDates(metalCurrencyCombined.CurrencyRates.Rates,
metalCurrencyCombined.Start, metalCurrencyCombined.End);
metalCurrencyCombined.CurrencyRates.Rates = currencyRatesFilled;
}
return(metalCurrencyCombined);
}
public MetalCurrencyCombined Execute(MetalCurrencyCombined metalCurrencyCombined)
{
var metalPricesFilled = metalCurrencyCombined.MetalPrices.Prices.Cast <ValueDate>().ToList();
var ratesFilled = metalCurrencyCombined.CurrencyRates.Rates.Cast <ValueDate>().ToList();//TODO: null thrown here on localhost - investigate https://localhost:44314/api/GoldCharts/USD/Silver/2000-1-1/2009-3-31
if (metalPricesFilled.Count != ratesFilled.Count)
{
throw new Exception("number of days for currency and metal not equal");
}
var prices = new List <ValueDate>();
foreach (var p in metalPricesFilled)
{
var r = ratesFilled.FirstOrDefault(e => e.Date == p.Date);
if (r == null)
{
continue;
}
prices.Add(new ValueDate
{
Date = p.Date,
Value = p.Value * r.Value
});
}
metalCurrencyCombined.MetalPrices = new MetalPrices
{
DataSource = metalCurrencyCombined.MetalPrices.DataSource,
Currency = metalCurrencyCombined.MetalPrices.Currency,
Prices = prices
};
return(metalCurrencyCombined);
}
