class_name WorldEntityRef
extends RefCounted

const SCHEMA_VERSION := 1

var _entity_type: StringName
var _entity_id: StringName


func _init(entity_type: StringName = &"", entity_id: StringName = &"") -> void:
	_entity_type = entity_type
	_entity_id = entity_id


static func create(entity_type: StringName, entity_id: StringName) -> WorldEntityRef:
	var entity_ref := WorldEntityRef.new(entity_type, entity_id)
	return entity_ref if entity_ref.is_valid() else null


static func from_dictionary(record_data: Dictionary) -> WorldEntityRef:
	if int(record_data.get("schema_version", -1)) != SCHEMA_VERSION:
		return null
	if not record_data.has_all(["entity_type", "entity_id"]):
		return null
	return create(StringName(record_data["entity_type"]), StringName(record_data["entity_id"]))


func is_valid() -> bool:
	return not _entity_type.is_empty() and not _entity_id.is_empty()


func get_entity_type() -> StringName:
	return _entity_type


func get_entity_id() -> StringName:
	return _entity_id


func index_key() -> String:
	var type_text := String(_entity_type)
	var id_text := String(_entity_id)
	return "%d:%s%d:%s" % [type_text.length(), type_text, id_text.length(), id_text]


func equals(other: WorldEntityRef) -> bool:
	return (
		other != null
		and _entity_type == other.get_entity_type()
		and _entity_id == other.get_entity_id()
	)


func duplicate_ref() -> WorldEntityRef:
	return WorldEntityRef.new(_entity_type, _entity_id)


func to_dictionary() -> Dictionary:
	return {
		"schema_version": SCHEMA_VERSION,
		"entity_type": String(_entity_type),
		"entity_id": String(_entity_id),
	}