class_name Springboard extends Area3D

@export var launch_speed: float = 10.0
@export var audio_player: AudioStreamPlayer3D

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

func _on_body_entered(body: PhysicsBody3D) -> void:
	var rbody := body as RigidBody3D
	var ch := body as Character
	if rbody:
		scale.y = 2.0
		rbody.apply_central_impulse(rbody.mass*(
			launch_speed*global_basis.y -
			rbody.linear_velocity.project(global_basis.y)
		))
		if ch:
			ch.ground_normal = global_basis.y
			ch.soft_force_change_state(&'launch')
		else:
			audio_player.play()

func _physics_process(delta: float) -> void:
	scale.y = lerp(scale.y, 1.0, 1.0 - 0.75**delta)