extends Node

signal scene_changed(scene_name: String)

var current_scene: Node = null
var scene_container: Node = null

const MAIN_MENU = "res://scenes/ui/main_menu/main_menu.tscn"
const DECK_MANAGER = "res://scenes/ui/deck_manager/deck_manager.tscn"
const QUIZ_SCENE = "res://scenes/ui/quiz_mode/quiz_scene.tscn"

func _ready() -> void:
	await get_tree().process_frame

	var root = get_tree().root
	var main = root.get_node_or_null("Main")

	if main:
		scene_container = main.get_node_or_null("CanvasLayer/SceneContainer")
		if scene_container:
			change_scene(MAIN_MENU)
		else:
			push_error("SceneContainer not found in Main scene")
	else:
		push_warning("Main scene not found yet, waiting for initialization")

func change_scene(scene_path: String) -> void:
	if not scene_container:
		push_error("Cannot change scene - scene_container is null")
		return

	if current_scene:
		current_scene.queue_free()
		await current_scene.tree_exited

	if not ResourceLoader.exists(scene_path):
		push_error("Scene does not exist: " + scene_path)
		return

	var new_scene_resource = load(scene_path)
	if not new_scene_resource:
		push_error("Failed to load scene: " + scene_path)
		return

	var new_scene = new_scene_resource.instantiate()
	scene_container.add_child(new_scene)
	current_scene = new_scene

	print("Changed scene to: " + scene_path)
	scene_changed.emit(scene_path)

func start_quiz(deck: Deck) -> void:
	change_scene(QUIZ_SCENE)
	await scene_changed
	if current_scene and current_scene.has_method("start_quiz"):
		current_scene.start_quiz(deck)

func return_to_main_menu() -> void:
	change_scene(MAIN_MENU)

func open_deck_manager() -> void:
	change_scene(DECK_MANAGER)