// Action processing.
public void ProcessAction(UnitAdditionAction action)
{
if (action is null)
{
throw new ArgumentNullException(nameof(action));
}
try {
AddUnit(action.Unit, action.Position);
} catch (InvalidOperationException) {}
}
public void PlanAction(UnitAdditionAction action) => PlanAction(this, action);
// Action planning.
public void PlanAction(UnitAdditionAction action) => Presented.PlanAction(action);