# ScreenHpBar —— 角色头顶的屏幕空间 HP 条（§8.8）。
#
# 参考端在 CPythonTextTail / CGraphicTextInstance 的屏幕坐标中绘制尾标；
# 这里用一个无输入的 Control 自绘背景、边框和填充，NetWorld 每帧负责把
# 实体的世界坐标投影到屏幕。这样 HP 条不会随 Label3D 的 billboard 深度
# 缩放，也不会被地图几何遮住。
extends Control

const DEFAULT_SIZE := Vector2(72.0, 6.0)
const MIN_FILL_RATIO := 0.0
const MAX_FILL_RATIO := 1.0

var hp := 0
var max_hp := 0
var ratio := 0.0
var dead := false

func _init() -> void:
	mouse_filter = MOUSE_FILTER_IGNORE
	size = DEFAULT_SIZE
	custom_minimum_size = DEFAULT_SIZE

func set_vitals(current_hp: int, current_max_hp: int, is_dead: bool) -> void:
	hp = current_hp
	max_hp = current_max_hp
	dead = is_dead
	ratio = clampf(float(hp) / float(max_hp), MIN_FILL_RATIO, MAX_FILL_RATIO) \
		if max_hp > 0 else 0.0
	queue_redraw()

func _draw() -> void:
	var r := Rect2(Vector2.ZERO, size)
	# Dark backing and a one-pixel black border keep the bar legible over terrain.
	draw_rect(r, Color(0.02, 0.02, 0.025, 0.86), true)
	var inner := Rect2(Vector2.ONE, Vector2(maxf(0.0, size.x - 2.0), maxf(0.0, size.y - 2.0)))
	var fill_color := Color(0.35, 0.35, 0.38, 0.95) if dead \
		else Color(0.88, 0.14, 0.14, 0.98)
	inner.size.x *= ratio
	if inner.size.x > 0.0:
		draw_rect(inner, fill_color, true)
	draw_rect(r, Color(0.0, 0.0, 0.0, 0.95), false, 1.0)