extends EffectBase
class_name Afterimage

@export var is_moving: bool = true

@onready var image: AnimatedSprite3D = $AnimatedSprite3D as AnimatedSprite3D

var velocity: Vector3
var target: AnimatedSprite3D
var alpha: float
var material: ShaderMaterial


func on_ready():
	if not target or not target.sprite_frames:
		queue_free()
		return
	image.sprite_frames = target.sprite_frames
	image.animation = target.animation
	image.frame = target.frame
	image.frame_progress = target.frame_progress
	image.scale.x = target.scale.x
	image.pixel_size = Setting.pixel_size
	material = ResourceManager.material_after_image.duplicate()
	image.material_override = material
	update_material()


func on_process(delta):
	if is_moving:
		position += velocity*delta
	#    image.modulate.a = rate * alpha
	update_material()


func update_material() -> void:
	if material and image.sprite_frames and image.animation:
		var tex: Texture2D = image.sprite_frames.get_frame_texture(image.animation, image.frame)
		material.set_shader_parameter("tex", tex)
		material.set_shader_parameter("alpha", rate * alpha)