@tool
extends Node2D

@export var watching_node: Node2D
@export var center_eye := false
@export var eye_texture: Texture2D:
	set(val):
		eye_texture = val
		if is_node_ready():
			eye_sprite.texture = eye_texture
@export var radius := 30.0:
	set(val):
		radius = val
		if is_node_ready():
			_setup_eye_direction()

@onready var eye_sprite := $眼睛 as Sprite2D


func _ready() -> void:
	eye_sprite.texture = eye_texture
	_setup_eye_direction()


func _physics_process(_delta: float) -> void:
	if not watching_node or Engine.is_editor_hint():
		return
	_setup_eye_direction()


func _setup_eye_direction():
	if not watching_node:
		eye_sprite.position.y = radius
		return
	# set eye_sprite position at the arrow head from self's position to watching_node's position
	var direction = watching_node.global_position - global_position
	eye_sprite.position = direction.normalized() * radius