class_name Registry

var DEFAULT : Variant
var BY_ID   : Array
var BY_NAME : Dictionary[String, Variant]

func add(name: String, obj: Variant) -> Variant:
	obj.id   = BY_ID.size()
	obj.name = name

	if BY_ID.is_empty(): DEFAULT = obj
	BY_ID.append(obj)
	BY_NAME[obj.name] = obj

	return obj

func lookup_by_id(id: int) -> Variant:
	return BY_ID[id] if (id >= 0) and (id < BY_ID.size()) else DEFAULT
func lookup_by_name(name: String) -> Variant:
	var found = BY_NAME.get(name)
	return found if found else DEFAULT