extends CanvasLayer

## 左上角的状态显示：3 颗心 + 回血道具数量 + 护盾剩余时间。
## 每帧从场景里找带 "player" 组的玩家读取状态。

@export var full_heart_texture: Texture2D
@export var empty_heart_texture: Texture2D

var _player: Node = null
var _hearts: Array = []
var _count_label: Label = null
var _shield_label: Label = null


func _ready() -> void:
	for i in range(1, 4):
		var heart := get_node_or_null("Heart%d" % i)
		if heart != null:
			_hearts.append(heart)
	_count_label = get_node_or_null("CountLabel")
	_shield_label = get_node_or_null("ShieldLabel")


func _process(_delta: float) -> void:
	if _player == null or not is_instance_valid(_player):
		_player = get_tree().get_first_node_in_group("player")
		if _player == null:
			return

	var health: int = int(_player.health)
	for i in _hearts.size():
		var heart: TextureRect = _hearts[i]
		heart.texture = full_heart_texture if i < health else empty_heart_texture

	var items: int = int(_player.heal_items)
	if _count_label != null:
		_count_label.text = "x%d" % items
		_count_label.modulate = Color.WHITE if items > 0 else Color(1.0, 1.0, 1.0, 0.4)

	if _shield_label != null:
		var shield: float = float(_player.shield_left)
		if shield > 0.0:
			_shield_label.text = "SHIELD %.1fs" % shield
		else:
			_shield_label.text = ""