extends Node
class_name StateMachine

var state = null
var previous_state = null
var states = {}

onready var parent = get_parent()

func _physics_process(delta):
	if state != null:
		_state_logic(delta)
		var transition = _get_transition(delta)
		if transition != null:
			set_state(transition)

#Follow 4 functions need to be pasted into new script and applied accordingly; See EnemySM.gd for examples
#State Logic is where you apply logic when parent enters a certain state
func _state_logic(delta):
	pass

#Get Transition applies when transitions should occur and applies new states
func _get_transition(delta):
	return null

# Enter State is called when a state is entered, mainly used for animations, sounds, or attacks
func _enter_state(new_state, old_state):
	pass

# Exit State is called when a state is exited, good for the same usage as enter state
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()