internal void ChangeComposition(int?index, HomeportShip ship)
{
if (index is int i)
{
if (ship != null)
{
var fromFleet = ship.Fleet;
if (fromFleet != null)
{
var oldIndex = fromFleet.ships.IndexOf(ship);
if (fromFleet == this)
{
ships.Exchange(i, oldIndex);
}
else if (i < ships.Count)
{
var oldShip = ships[i];
ships.RemoveAt(i);
fromFleet.ships.RemoveAt(oldIndex);
ships.Insert(i, ship);
fromFleet.ships.Insert(oldIndex, oldShip);
}
else
{
fromFleet.ships.Remove(ship);
ships.Add(ship);
}
}
else if (i < ships.Count)
{
ships[i] = ship;
}
else
{
ships.Add(ship);
}
}
else
{
ships.RemoveAt(i);
}
}
else
{
while (ships.Count > 1)
{
ships.RemoveAt(1);
}
}
}