class_name Event extends Node

const Entity = preload("res://scripts/Entity/Entity.gd");

var inEventSystemTree:bool = false;
var started:bool = false;
var ended:bool = false;
var interactor:EntityInteractor = null
var interactee:EntityInteractable = null

signal eventEnded()

# Godot Methods
func _process(delta: float) -> void:
	if !started || ended:
		return
	self.update(delta)

	if self.isDone():
		self.end()

# Event methods (cleaned up)
func start() -> void:
	assert(
		self.is_inside_tree(), 
		"Event is trying to start but the node is not part of the scene tree. "+
		"Refer to EventSystem.addEvent"
	)
	assert(started == false)
	started = true

func update(_delta:float) -> void:
	assert(started == true)
	assert(ended == false)

func isDone() -> bool:
	return true

func end() -> void:
	assert(ended == false)
	ended = true
	self.eventEnded.emit()
	if self.inEventSystemTree:
		EVENT.removeEvent(self)

func isEndingEvent() -> bool:
	return false

func reset() -> void:
	started = false
	ended = false
	interactor = null
	interactee = null

func onEntityInteract(
	interactor:EntityInteractor,
	interactee:EntityInteractable
) -> void:
	self.reset()
	self.interactor = interactor
	self.interactee = interactee
	self.start()