extends Control
class_name VirtualButton
## 虚拟按钮控件
## 用于移动端触摸输入

# 按钮参数
@export var button_radius: float = 40.0
@export var button_text: String = "E"

# 按钮状态
var is_pressed_state: bool = false
var was_just_pressed: bool = false
var touch_index: int = -1

# 视觉元素
var button_circle: ColorRect
var label: Label

func _ready():
	"""初始化虚拟按钮"""
	_create_visual_elements()
	
	# 设置大小
	custom_minimum_size = Vector2(button_radius * 2, button_radius * 2)
	size = custom_minimum_size

func _create_visual_elements():
	"""创建按钮的视觉元素"""
	# 创建按钮背景
	button_circle = ColorRect.new()
	button_circle.color = Color(0.2, 0.6, 0.2, 0.6)
	button_circle.size = Vector2(button_radius * 2, button_radius * 2)
	button_circle.position = Vector2.ZERO
	add_child(button_circle)
	
	# 创建文本标签
	label = Label.new()
	label.text = button_text
	label.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	label.vertical_alignment = VERTICAL_ALIGNMENT_CENTER
	label.size = Vector2(button_radius * 2, button_radius * 2)
	label.position = Vector2.ZERO
	label.add_theme_font_size_override("font_size", 24)
	add_child(label)

func _process(_delta: float):
	"""每帧更新"""
	# 重置 just_pressed 状态
	if was_just_pressed:
		was_just_pressed = false

func _gui_input(event: InputEvent):
	"""处理触摸输入"""
	if event is InputEventScreenTouch:
		if event.pressed:
			# 触摸开始
			is_pressed_state = true
			was_just_pressed = true
			touch_index = event.index
			_update_visual(true)
		elif event.index == touch_index:
			# 触摸结束
			is_pressed_state = false
			touch_index = -1
			_update_visual(false)

func _update_visual(pressed: bool):
	"""更新按钮视觉状态"""
	if pressed:
		button_circle.color = Color(0.3, 0.8, 0.3, 0.8)
	else:
		button_circle.color = Color(0.2, 0.6, 0.2, 0.6)

## 检查按钮是否刚被按下
func is_pressed() -> bool:
	"""
	检查按钮是否刚被按下（类似 Input.is_action_just_pressed）
	@return: 是否刚被按下
	"""
	return was_just_pressed

## 检查按钮是否正在被按住
func is_held() -> bool:
	"""
	检查按钮是否正在被按住
	@return: 是否被按住
	"""
	return is_pressed_state