public static bool HasCommonCurrencyWith(this TradeMergeItemDto fisrtTradeMergeItem, TradeMergeItemDto secondTradeMergeItem)
{
var currencies = new List <Currency>()
{
fisrtTradeMergeItem.FirstCurrency,
fisrtTradeMergeItem.SecondCurrency,
secondTradeMergeItem.FirstCurrency,
secondTradeMergeItem.SecondCurrency
};
return(currencies.Distinct().Count() < 4);
}
public static bool CanBeThirdCurrencyIn(this TradeMergeItemDto tradeMergeItem, List <TradeMergeItemDto> alreadyAddedTrades)
{
if (alreadyAddedTrades.Count != 2)
{
throw new SelectedTradesWrongAmountException($"Added for merge trades amount should be 2. Actual amount is {alreadyAddedTrades.Count}.");
}
var currencies = alreadyAddedTrades.GetCurrencies();
var duplicateCurrency = currencies.GroupBy(c => c)
.Where(g => g.Count() > 1)
.Select(g => g.Key)
.Single();
currencies.RemoveAll(c => c == duplicateCurrency);
return(currencies.TrueForAll(c => c == tradeMergeItem.FirstCurrency || c == tradeMergeItem.SecondCurrency));
}
