# 文件名: start.gd
# 场景的根节点脚本，通常用于处理主菜单或启动界面的逻辑。
extends Node2D

# --- 节点引用 ---
@onready var new_game_button: Button = $UI/Select_List/New
@onready var load_game_button: Button = $UI/Select_List/Load
# @onready var error_message_label = $UI/ErrorMessageLabel # 如果有错误提示标签

# --- 场景路径 ---
# const GameScene_path = "res://Entity/Level/GameScene.tscn" # 不再由此脚本直接切换
const LOADING_SCENE_PATH = "res://Entity/Level/LoadingScene.tscn" # <--- 新增：LoadingScene的路径，请确保正确！

# --- Godot 生命周期方法 ---

func _ready():
	print("Start Scene: Initializing...")
	# --- 连接 UI 信号 ---
	if new_game_button:
		if not new_game_button.is_connected("pressed", Callable(self, "_on_new_game_pressed")):
			new_game_button.pressed.connect(self._on_new_game_pressed)
		print("Start Scene: Connected 'pressed' signal for New Game button.")
	else:
		printerr("Start Scene Error: New Game button node not found at path specified in @onready var.")

	if load_game_button:
		if not load_game_button.is_connected("pressed", Callable(self, "_on_load_game_pressed")):
			load_game_button.pressed.connect(self._on_load_game_pressed)
		print("Start Scene: Connected 'pressed' signal for Load Game button.")
		# 示例：根据存档是否存在禁用加载按钮 (需要 SaveLoadManager Autoload)
		# if ProjectSettings.has_setting("autoload/SaveLoadManager"):
		#	 load_game_button.disabled = !SaveLoadManager.does_save_exist(1) # 假设检查槽位1
		# else:
		#	 printerr("Start Scene Warning: SaveLoadManager Autoload not found, cannot check save existence for button state.")
	else:
		printerr("Start Scene Error: Load Game button node not found at path specified in @onready var.")

	# --- 移除 InitializationManager 信号连接 ---
	# 不再需要在此处连接 InitializationManager 的信号，这些将由 LoadingScene 处理。
	# 例如，以下代码需要被移除或注释掉：
	# if ProjectSettings.has_setting("autoload/InitializationManager"):
	#	 if not InitializationManager.is_connected("new_game_initialized", Callable(self, "_on_initialization_complete")):
	#		 InitializationManager.new_game_initialized.connect(self._on_initialization_complete)
	#	 if not InitializationManager.is_connected("game_loaded", Callable(self, "_on_initialization_complete")):
	#		 InitializationManager.game_loaded.connect(self._on_initialization_complete)
	# else:
	#	 printerr("Start Scene Error: InitializationManager Autoload is not configured...")


# 当此节点从场景树中移除时调用
func _exit_tree():
	# --- 移除 InitializationManager 信号断开 ---
	# 同样，不再需要在此处断开 InitializationManager 的信号。
	# if ProjectSettings.has_setting("autoload/InitializationManager"):
	#	 if InitializationManager.is_connected("new_game_initialized", Callable(self, "_on_initialization_complete")):
	#		 InitializationManager.new_game_initialized.disconnect(Callable(self, "_on_initialization_complete"))
	#	 if InitializationManager.is_connected("game_loaded", Callable(self, "_on_initialization_complete")):
	#		 InitializationManager.game_loaded.disconnect(Callable(self, "_on_initialization_complete"))
	pass # 如果没有其他需要在退出时清理的，可以留空或移除此函数


# --- UI 信号回调函数 ---

# 当“新游戏”按钮被按下时调用
func _on_new_game_pressed():
	print("Start Scene: 'New Game' button pressed. Transitioning to Loading Scene...")
	if new_game_button: new_game_button.disabled = true # 禁用按钮防止重复点击
	if load_game_button: load_game_button.disabled = true

	# 检查 LoadingContext Autoload 是否存在
	if not ProjectSettings.has_setting("autoload/LoadingContext"):
		printerr("Start Scene CRITICAL Error: LoadingContext Autoload not configured!")
		# 重新启用按钮，让用户可以重试或意识到问题
		if new_game_button: new_game_button.disabled = false
		if load_game_button: load_game_button.disabled = false
		# (可选) 显示错误信息给用户
		# if error_message_label: error_message_label.text = "错误：无法准备加载流程！"
		return

	# 设置 LoadingContext
	LoadingContext.action_to_perform = "new_game"
	LoadingContext.save_data_for_loading = {} # 确保对于新游戏，存档数据为空

	# 切换到 LoadingScene
	var err = get_tree().change_scene_to_file(LOADING_SCENE_PATH)
	if err != OK:
		printerr("Start Scene CRITICAL ERROR: Failed to switch to Loading Scene! Error code: " + str(err))
		if new_game_button: new_game_button.disabled = false
		if load_game_button: load_game_button.disabled = false
		# (可选) 显示错误信息给用户
		# if error_message_label: error_message_label.text = "错误：无法打开加载界面！"


# 当“加载游戏”按钮被按下时调用
func _on_load_game_pressed():
	var slot_to_load = 1 # <-- 您可以根据需要修改或添加选择存档槽的逻辑
	print("Start Scene: 'Load Game' button pressed. Requesting load for slot " + str(slot_to_load) + "...")

	if new_game_button: new_game_button.disabled = true
	if load_game_button: load_game_button.disabled = true

	# 检查必要的 Autoloads
	if not ProjectSettings.has_setting("autoload/SaveLoadManager"):
		printerr("Start Scene CRITICAL Error: SaveLoadManager Autoload not configured!")
		if new_game_button: new_game_button.disabled = false
		if load_game_button: load_game_button.disabled = false
		return
	if not ProjectSettings.has_setting("autoload/LoadingContext"):
		printerr("Start Scene CRITICAL Error: LoadingContext Autoload not configured!")
		if new_game_button: new_game_button.disabled = false
		if load_game_button: load_game_button.disabled = false
		return

	# 1. 尝试从 SaveLoadManager 加载数据
	var loaded_data: Variant = SaveLoadManager.load_game(slot_to_load)

	# 2. 检查加载是否成功
	if loaded_data == null:
		printerr("Start Scene: Failed to load save data from slot " + str(slot_to_load) + " (SaveLoadManager returned null).")
		if new_game_button: new_game_button.disabled = false
		if load_game_button: load_game_button.disabled = false
		# (可选) 显示错误信息给用户
		# if error_message_label: error_message_label.text = "加载存档失败！"
		return

	if not loaded_data is Dictionary:
		printerr("Start Scene Error: Loaded data from SaveLoadManager is not a Dictionary. Type:", typeof(loaded_data))
		if new_game_button: new_game_button.disabled = false
		if load_game_button: load_game_button.disabled = false
		return

	# 3. 设置 LoadingContext
	LoadingContext.action_to_perform = "load_game"
	LoadingContext.save_data_for_loading = loaded_data # 将加载到的字典传递过去

	# 4. 切换到 LoadingScene
	var err = get_tree().change_scene_to_file(LOADING_SCENE_PATH)
	if err != OK:
		printerr("Start Scene CRITICAL ERROR: Failed to switch to Loading Scene! Error code: " + str(err))
		if new_game_button: new_game_button.disabled = false
		if load_game_button: load_game_button.disabled = false


# --- InitializationManager 信号回调函数 ---
# func _on_initialization_complete(): # <--- 此方法不再需要，可以安全移除或注释掉
#	 print("Start Scene: Received initialization complete signal (New Game or Load).")
#	 print("--------------------------------------------------")
#	 print("Start Scene: Initialization successful!")
#	 print("--------------------------------------------------")
#	 Go_To_GameScene()


# --- 辅助函数 ---
# func Go_To_GameScene(): # <--- 此方法不再需要，因为场景切换由 LoadingScene 处理
#	 print("Start Scene: Attempting to switch to Game Scene:", GameScene_path)
#	 var err = get_tree().change_scene_to_file(GameScene_path)
#	 if err != OK:
#		 printerr("Start Scene CRITICAL ERROR: Failed to switch to main game scene!")