using Godot;

public class GoldBar : KinematicBody {
    private Vector3 targetPosition;
    private bool hasTarget;
    public Vector3 velocity;

    // Called when the node enters the scene tree for the first time.
    public override void _Ready() {
        targetPosition = GlobalTransform.origin;
    }

    public void SetTarget(Vector3 target) {
        targetPosition = target;
        hasTarget = true;
    }

    public void UnsetTarget() {
        hasTarget = false;
    }

    // Called every frame. 'delta' is the elapsed time since the previous frame.
    public override void _PhysicsProcess(float delta) {
        if (hasTarget) {
            if (targetPosition.IsEqualApprox(GlobalTransform.origin)) {
                targetPosition = GlobalTransform.origin;
                velocity = Vector3.Zero;
            }


            Vector3 targetDirection = (targetPosition - GlobalTransform.origin).Normalized();
            velocity = targetDirection * (velocity.Length() + 10 * delta);
            Transform = new Transform(Transform.basis.Rotated(Vector3.Up, delta * 2.0f), Transform.origin);
        } else {
            velocity.y = velocity.y - 9.81f * delta;
        }

        velocity = MoveAndSlide(velocity, Vector3.Up);

        if (IsOnFloor() || Mathf.Abs(Transform.origin.y) < 0.01) {
            // apply damping when on ground
            velocity = velocity - velocity.Normalized() * 0.9f * delta;
        }

        if (velocity.LengthSquared() < 0.01) {
            velocity = Vector3.Zero;
        }
    }
}