extends CanvasLayer


## Minimal player HUD.
##
## This is a CanvasLayer on purpose: its coordinates belong to the camera
## viewport, not to the level. Therefore (18, 18) always means "18 pixels from
## the top-left corner currently visible by the camera", even while the player
## and Camera2D move through the world.

@onready var health_bar: ProgressBar = $HUD/HealthBar
@onready var health_label: Label = $HUD/HealthBar/HealthLabel


func _ready() -> void:
	var player: Node = get_parent()
	if player == null or not player.has_signal(&"health_changed"):
		push_error("PlayerHealthHUD must be a child of a Player with health_changed signal.")
		return

	# Child _ready() runs before Player._ready(). We connect here first and the
	# Player will emit its initial health value a moment later during its _ready().
	player.connect(&"health_changed", _on_health_changed)


func _on_health_changed(current_health: int, max_health: int) -> void:
	health_bar.max_value = float(max_health)
	health_bar.value = float(current_health)
	health_label.text = "HP  %d / %d" % [current_health, max_health]