extends Control
class_name LoginScreen
## 登录界面
## 处理用户登录和角色创建入口

# UI 元素
var username_input: LineEdit
var login_button: Button
var create_character_button: Button
var status_label: Label
var container: VBoxContainer

# 信号
signal login_requested(username: String)
signal create_character_requested()

func _ready():
	"""初始化登录界面"""
	_create_ui()
	_setup_animations()
	update_layout()

## 设置动画效果
func _setup_animations():
	"""设置界面动画效果"""
	# 为移动设备优化触摸体验
	TouchFeedbackManager.optimize_ui_for_touch(self)
	
	# 界面入场动画
	UIAnimationManager.fade_slide_in(container, "bottom", 0.5)

## 创建 UI 元素
func _create_ui():
	"""创建登录界面的所有 UI 元素"""
	# 设置为全屏
	anchor_right = 1.0
	anchor_bottom = 1.0
	
	# 创建中心容器
	container = VBoxContainer.new()
	container.name = "Container"
	container.custom_minimum_size = Vector2(300, 0)
	# 设置容器锚点为居中
	container.anchor_left = 0.5
	container.anchor_right = 0.5
	container.anchor_top = 0.5
	container.anchor_bottom = 0.5
	container.offset_left = -150  # 容器宽度的一半
	container.offset_right = 150
	container.offset_top = -200   # 估算容器高度的一半
	container.offset_bottom = 200
	add_child(container)
	
	# 标题
	var title = Label.new()
	title.text = "AI Town Game"
	title.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	title.add_theme_font_size_override("font_size", 32)
	container.add_child(title)
	
	# 间距
	container.add_child(_create_spacer(20))
	
	# 用户名标签
	var username_label = Label.new()
	username_label.text = "用户名:"
	container.add_child(username_label)
	
	# 用户名输入框
	username_input = LineEdit.new()
	username_input.placeholder_text = "输入你的用户名"
	username_input.custom_minimum_size = Vector2(0, 40)
	username_input.text_submitted.connect(_on_username_submitted)
	container.add_child(username_input)
	
	# 间距
	container.add_child(_create_spacer(10))
	
	# 登录按钮
	login_button = Button.new()
	login_button.text = "登录"
	login_button.custom_minimum_size = Vector2(0, 50)
	login_button.pressed.connect(_on_login_pressed)
	container.add_child(login_button)
	
	# 间距
	container.add_child(_create_spacer(10))
	
	# 创建角色按钮
	create_character_button = Button.new()
	create_character_button.text = "创建新角色"
	create_character_button.custom_minimum_size = Vector2(0, 50)
	create_character_button.pressed.connect(_on_create_character_pressed)
	container.add_child(create_character_button)
	
	# 间距
	container.add_child(_create_spacer(20))
	
	# 状态标签
	status_label = Label.new()
	status_label.text = ""
	status_label.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	status_label.add_theme_color_override("font_color", Color(1, 0.5, 0.5))
	container.add_child(status_label)

## 创建间距
func _create_spacer(height: float) -> Control:
	"""创建垂直间距"""
	var spacer = Control.new()
	spacer.custom_minimum_size = Vector2(0, height)
	return spacer

## 更新布局
func update_layout():
	"""更新布局以适应窗口大小"""
	if not container:
		return
	
	# 容器已经通过锚点设置为居中，无需手动计算位置
	# 锚点会自动适应窗口大小变化

## 显示状态消息
func show_status(message: String, is_error: bool = false):
	"""
	显示状态消息
	@param message: 消息文本
	@param is_error: 是否为错误消息
	"""
	if status_label:
		status_label.text = message
		if is_error:
			status_label.add_theme_color_override("font_color", Color(1, 0.3, 0.3))
		else:
			status_label.add_theme_color_override("font_color", Color(0.3, 1, 0.3))

## 清除状态消息
func clear_status():
	"""清除状态消息"""
	if status_label:
		status_label.text = ""

## 设置按钮启用状态
func set_buttons_enabled(enabled: bool):
	"""
	设置所有按钮的启用状态
	@param enabled: 是否启用
	"""
	if login_button:
		login_button.disabled = not enabled
	if create_character_button:
		create_character_button.disabled = not enabled

## 登录按钮点击
func _on_login_pressed():
	"""登录按钮被点击"""
	var username = username_input.text.strip_edges()
	
	if username.is_empty():
		show_status("请输入用户名", true)
		# 添加错误动画反馈
		UIAnimationManager.shake_error(username_input, 8.0, 0.4)
		return
	
	# 添加成功反馈动画
	UIAnimationManager.button_press_feedback(login_button)
	clear_status()
	login_requested.emit(username)

## 创建角色按钮点击
func _on_create_character_pressed():
	"""创建角色按钮被点击"""
	create_character_requested.emit()

## 用户名输入框回车
func _on_username_submitted(_text: String):
	"""用户名输入框按下回车"""
	_on_login_pressed()