extends Node
class_name TopicData


signal topic_added(topic, position)

var dirty_flag = false
var loaded_topics = []


func add_topic(position: int):
	var topic = Topic.new()
	loaded_topics.append(topic)
	dirty_flag = true
	
	emit_signal("topic_added", topic, position)


func sort_topics():
	loaded_topics.sort_custom(self, "_compare_topic_index")


func _compare_topic_index(a, b):
	return a.associated_node.parent.get_index() < b.associated_node.parent.get_index()


func load_data():
	# TODO: Load data.
	pass


func save_data():
	if dirty_flag:
		sort_topics() # Important before saving, to remain the order.
		# TODO: Save data.
		pass
	
	# dirty_flag needs to be set to false after successful save!
	dirty_flag = false