extends Node

@export var current_state: State
var subject: Node

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

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

	current_state = new_state
	current_state.enter()

func process_physics(delta: float) -> void:
	if not current_state or not current_state.subject: return

	var new_state = current_state.process_physics(delta)
	if new_state:
		_change_state(new_state)

func process_input(event: InputEvent) -> void:
	if not current_state or not current_state.subject: return

	var new_state = current_state.process_input(event)
	if new_state:
		_change_state(new_state)

func process_frame(delta: float) -> void:
	if not current_state or not current_state.subject: return

	var new_state = current_state.process_frame(delta)
	if new_state:
		_change_state(new_state)