extends CanvasLayer
## HUD：分数、生命（图标）、提示。接 Main 的方法直接更新。
## 命数图标用 ColorRect 排一排，比纯数字直观。

const LIFE_ICON_SIZE: Vector2 = Vector2(24, 8)
const LIFE_ICON_SPACING: float = 4.0
const LIFE_ICON_COLOR: Color = Color(0.4, 0.6, 1.0)

@onready var score_label: Label = $ScoreLabel
@onready var lives_label: Label = $LivesLabel
@onready var message_label: Label = $MessageLabel
@onready var lives_container: HBoxContainer = $LivesContainer

func _ready() -> void:
	show_message("按 空格 发球")

func update_score(score: int) -> void:
	score_label.text = "Score: %d" % score

func update_lives(lives: int) -> void:
	lives_label.text = "Lives: %d" % lives
	_refresh_life_icons(lives)

func show_message(text: String) -> void:
	message_label.text = text

func _refresh_life_icons(lives: int) -> void:
	# 清空旧图标
	for child in lives_container.get_children():
		child.queue_free()
	# 重新生成 lives 个
	for i in range(lives):
		var icon := ColorRect.new()
		icon.custom_minimum_size = LIFE_ICON_SIZE
		icon.color = LIFE_ICON_COLOR
		lives_container.add_child(icon)