class_name StateMachine extends Node

@export var starting_state : String = ""
var states : Dictionary[String, StateNode] = {}
var curr_state : StateNode = null
var actor = null
func _ready() -> void:
	for child in get_children():
		if child is StateNode:
			states[child.name] = child
			child.state_machine = self
			child.completed.connect(_on_state_completed)
	
	
func start() -> void:
	if starting_state != "":
		var state : StateNode = states.get(starting_state)
		if state == null:
			printerr("Starting state not found! Expected %s" % [starting_state])
		else:
			enter_state(state)
			curr_state.execute(actor)

func exit_state(state : StateNode) -> void:
	curr_state.exit()
	curr_state = null
	pass

func enter_state(state : StateNode) -> void:
	curr_state = state
	curr_state.enter()
	pass


func advance_state() -> void:
	pass


func _on_state_completed(state : StateNode) -> void:
	if state == curr_state:
		advance_state()
	else:
		printerr("Wrong state completed! %s when expecting %s" % [state.name, curr_state])