class_name StateMachine extends Node

@export var initialState: State = null

@onready var state: State = (func getInitialState() -> State: 
    return initialState if initialState != null else get_child(0)    
).call()


func ready() -> void:
    for stateNode: State in find_children("*", "State"):
        stateNode.finished.connect(transitionToNextState)

    await owner.ready
    state.enter("")


func unhandledInput(event: InputEvent) -> void:
    state.handleInput(event)


func process(delta: float) -> void:
    state.update(delta)


func transitionToNextState(targetStatePath: String, data: Dictionary = {}) -> void:
    if not has_node(targetStatePath):
        printerr(owner.name + ": Trying to transition to state " + targetStatePath + " but it does not exist.")
        return
    var previousStatePath := state.name
    state.exit()
    state = get_node(targetStatePath)
    state.enter(previousStatePath, data)