class_name EventSystem extends Node

const EVENT_FLAG_COUNT = 32

enum SpecialEvent {
	INVALID = 0,
	TEST_QUEST = 1,
};

var eventFlags:Dictionary[int, int] = {}
signal eventFlagUpdated(event:SpecialEvent, flags:int)

func eventFlagOn(event:SpecialEvent, flagsToTurnOn:int) -> void:
	if !eventFlags.has(event):
		eventFlags[event] = 0;
	
	eventFlags[event] |= flagsToTurnOn;
	eventFlagUpdated.emit(event, eventFlags[event]);

func eventFlagOff(event:SpecialEvent, flagsToTurnOff:int) -> void:
	if !eventFlags.has(event):
		eventFlags[event] = 0;
	eventFlags[event] &= ~flagsToTurnOff;
	eventFlagUpdated.emit(event, eventFlags[event]);

func eventFlagSetTo(event:SpecialEvent, flagsToSet:int) -> void:
	if !eventFlags.has(event):
		eventFlags[event] = 0;
	eventFlags[event] = flagsToSet;
	eventFlagUpdated.emit(event, eventFlags[event]);

func eventAreFlagsOn(event:SpecialEvent, flagsToCheck:int) -> bool:
	if !eventFlags.has(event):
		eventFlags[event] = 0;
	return (eventFlags[event] & flagsToCheck) == flagsToCheck;

func eventIsAnyOfFlagsOn(event:SpecialEvent, flagsToCheck:int) -> bool:
	if !eventFlags.has(event):
		eventFlags[event] = 0;
	return (eventFlags[event] & flagsToCheck) != 0;

func eventAreFlagsOff(event:SpecialEvent, flagsToCheck:int) -> bool:
	if !eventFlags.has(event):
		eventFlags[event] = 0;
	return (eventFlags[event] & flagsToCheck) == 0;

func eventIsAnyOfFlagsOff(event:SpecialEvent, flagsToCheck:int) -> bool:
	if !eventFlags.has(event):
		eventFlags[event] = 0;
	return (eventFlags[event] & flagsToCheck) != flagsToCheck;

# Adds an event that is created by code into the scene tree and lets it be
# managed properly by the event system.
func addEvent(event:Event) -> void:
	assert(
		!event.is_inside_tree(),
		"Event is already inside the scene tree, cannot add it again."
	)

	$StartedEvents.add_child(event)
	event.inEventSystemTree = true

func removeEvent(event:Event) -> void:
	assert(
		event.inEventSystemTree,
		"Event is not inside event system tree."
	)

	event.inEventSystemTree = false
	$StartedEvents.remove_child(event)
	event.queue_free()