public static decimal?BuildWeightedAverageSell(List <Watcher> watchers)
{
// Watchers selling
var watcherWillingToSell = watchers.Where(WatcherExpression.WatcherSelling()).ToList();
// Return if no watchers
if (watcherWillingToSell.Count == 0)
{
return(null);
}
// Total quantity
var totalQuantity = watcherWillingToSell.Select(x => x.Quantity).Sum();
// Weights
var weights = watcherWillingToSell.Select(x => x.Sell * x.Quantity);
// Total weight
var totalWeight = weights.Sum();
// Weighted average
var weightedAverage = totalWeight / totalQuantity;
// Return
return(weightedAverage);
}
public static WatcherStatus BuildStatus(Watcher watcher)
{
// Evaluate and return
if (WatcherExpression.WatcherNotSet().Invoke(watcher))
{
return(WatcherStatus.NOT_SET);
}
if (WatcherExpression.WatcherBuying().Invoke(watcher))
{
return(WatcherStatus.BUYING);
}
if (WatcherExpression.WatcherSelling().Invoke(watcher))
{
return(WatcherStatus.SELLING);
}
if (WatcherExpression.WatcherBought().Invoke(watcher))
{
return(WatcherStatus.BOUGHT);
}
if (WatcherExpression.WatcherHolding().Invoke(watcher))
{
return(WatcherStatus.HOLDING);
}
if (WatcherExpression.WatcherSold().Invoke(watcher))
{
return(WatcherStatus.SOLD);
}
throw new NotImplementedException();
}