extends CharacterBody2D
## 挡板：跟随键盘或鼠标左右移动，支持加宽道具。
## 速度/边界在编辑器里可调。

@export var speed: float = 600.0
@export var use_mouse: bool = true
@export var left_bound: float = 32.0
@export var right_bound: float = 1248.0

@export var default_size: Vector2 = Vector2(96, 16)    ## 初始宽高
@export var wide_size: Vector2 = Vector2(160, 16)      ## 加宽后尺寸
@export var wide_duration: float = 10.0                ## 加宽持续时间（秒）

@onready var _collision_shape: CollisionShape2D = $CollisionShape2D
@onready var _visual: ColorRect = $ColorRect
@onready var _shape: RectangleShape2D = _collision_shape.shape

var _wide_timer: float = 0.0
var _is_wide_active: bool = false  ## 边界是否已被缩过（防止多次加宽累积）

func _ready() -> void:
	add_to_group("paddle")
	_resize(default_size)

func _physics_process(_delta: float) -> void:
	# 加宽倒计时
	if _wide_timer > 0.0:
		_wide_timer -= _delta
		if _wide_timer <= 0.0:
			_resize(default_size)
			if _is_wide_active:
				left_bound -= 32.0
				right_bound += 32.0
				_is_wide_active = false

	var target_x: float = position.x

	if use_mouse:
		target_x = clamp(get_global_mouse_position().x, left_bound, right_bound)
	else:
		var dir: float = 0.0
		if Input.is_action_pressed("ui_left"):
			dir -= 1.0
		if Input.is_action_pressed("ui_right"):
			dir += 1.0
		target_x = position.x + speed * dir * _delta

	position.x = clamp(target_x, left_bound, right_bound)
	velocity = Vector2.ZERO

func widen() -> void:
	if not _is_wide_active:
		_resize(wide_size)
		left_bound += 32.0
		right_bound -= 32.0
		_is_wide_active = true
	_wide_timer = wide_duration  # 续期

func is_wide() -> bool:
	return _wide_timer > 0.0

func reset_state() -> void:
	# 关卡切换时调用：撤销加宽
	if _is_wide_active:
		_resize(default_size)
		left_bound -= 32.0
		right_bound += 32.0
		_is_wide_active = false
	_wide_timer = 0.0

func get_half_width() -> float:
	return _shape.size.x / 2.0

func get_wide_timer() -> float:
	return _wide_timer

func _resize(size: Vector2) -> void:
	_shape.size = size
	_visual.size = size
	_visual.position = -size / 2.0  # 中心对齐