extends Node

@export var starting_state: State

var current_state: State

func init(subject: Node) -> void:
	for state in get_children():
		state.subject = subject

	_change_state(starting_state)

func _change_state(new_state: State) -> void:
	if current_state:
		current_state.exit()

	current_state = new_state
	current_state.enter()

func _physics_process(delta: float) -> void:
	var new_state = current_state.process_physics(delta)
	if new_state:
		_change_state(new_state)

func _unhandled_input(event: InputEvent) -> void:
	var new_state = current_state.process_input(event)
	if new_state:
		_change_state(new_state)

func _process(delta: float) -> void:
	var new_state = current_state.process_frame(delta)
	if new_state:
		_change_state(new_state)