/// <summary>
/// Adjusts the amount of available units for every transaction
/// </summary>
/// <param name="newEntry">New entry</param>
private void AdjustAvailableUnits(ITransactionBookEntry newEntry)
{
var id = newEntry.StockId;
if (newEntry is ISellingTransactionBookEntry && newEntry.Shares > GetOrAddOpenPosition(id).Shares)
{
throw new InvalidOperationException("Cannot sell more units than available.");
}
_changedEntries.Clear(id);
if (newEntry is IBuyingTransactionBookEntry)
{
UpdateOpenPosition(id);
return;
}
if (newEntry is ISplitTransactionBookEntry split)
{
var buys = _entries.GetOrAdd(id).Where(e => e is IBuyingTransactionBookEntry).ToList();
buys.ForEach(t => _entries.Delete(id, t));
_entries.Add(id, split.CreatePositionAfterSplit(buys));
UpdateOpenPosition(id);
return;
}
var newUnitsToSell = newEntry.Shares;
var deletes = new List <ITransactionBookEntry>();
foreach (var entry in _entries.GetOrAdd(id).OrderBy(e => e.OrderDate))
{
if (entry is IBuyingTransactionBookEntry)
{
var changed = entry.Copy();
//Complete buying transaction filled
if (entry.Shares <= newUnitsToSell)
{
newUnitsToSell -= entry.Shares;
if (!(newEntry is IDividendTransactionBookEntry))
{
entry.Shares = 0;
}
}
//Partly filled
else
{
changed.Shares = newUnitsToSell;
changed.OrderCosts = (entry.OrderCosts / entry.Shares) * newUnitsToSell;
if (!(newEntry is IDividendTransactionBookEntry))
{
entry.OrderCosts = (entry.OrderCosts / entry.Shares) * (entry.Shares - newUnitsToSell);
entry.Shares -= newUnitsToSell;
}
newUnitsToSell = 0;
}
_changedEntries.Add(id, changed);
if (entry.Shares == 0 && !(newEntry is IDividendTransactionBookEntry))
{
deletes.Add(entry);
}
if (newUnitsToSell == 0)
{
break;
}
}
}
_changedEntries.Add(id, newEntry);
_entries.Delete(id, newEntry);
if (!(newEntry is IDividendTransactionBookEntry))
{
deletes.ForEach(t => _entries.Delete(id, t));
}
UpdateOpenPosition(id);
}
