extends Node

class_name StateMachine

var state = null setget set_state
var previous_state = null
var states = {}
onready var parent = get_parent()

func _ready():
	pass # Replace with function body.

func _physics_process(delta):
	if state !=null:
		_state_logic(delta)
		var transition = _get_transition(delta)
		if transition !=null:
			set_state(transition)
func _state_logic(delta):
	pass
	
func _get_transition(delta):
	return null
	
func _enter_state(new_state,old_state):
	pass
	
func _exit_state(old_state,new_state):
	pass

func set_state(new_state):
	previous_state = state
	state=new_state
	
	if previous_state!=null:
		_exit_state(previous_state,new_state)
	if new_state!=null:
		_enter_state(new_state,previous_state)

func add_state(state_name):
	states[state_name] = states.size()