extends Area3D

@export var initial_speed := 24.0
@export var minimum_speed := 4.0
@export var deceleration := 9.0
@export var lifetime := 3.0

var _direction := Vector3.FORWARD
var _speed := initial_speed
var _age := 0.0


func launch(origin: Vector3, direction: Vector3) -> void:
	global_position = origin
	if direction.length() > 0.0001:
		_direction = direction.normalized()
		look_at(global_position + _direction, Vector3.UP)
	_speed = initial_speed


func _ready() -> void:
	body_entered.connect(_on_body_entered)
	area_entered.connect(_on_area_entered)


func _physics_process(delta: float) -> void:
	_age += delta
	if _age >= lifetime:
		queue_free()
		return

	global_position += _direction * _speed * delta
	_speed = move_toward(_speed, minimum_speed, deceleration * delta)


func _on_body_entered(_body: Node3D) -> void:
	queue_free()


func _on_area_entered(_area: Area3D) -> void:
	queue_free()