protected override void Attack()
    {
        switch(states)
        {
            case SniperState.patrol:
                if (Vector3.Distance(transform.position, player.transform.position) < area)
                {
                    states = SniperState.prepare;
                    timer = 0;
                }
                break;
            case SniperState.prepare:
                timer += Time.deltaTime;
                transform.LookAt(player.transform.position);
                if (timer >= coolDown)
                    states = SniperState.fire;
                break;
            case SniperState.fire:
                GameObject buf = Instantiate(bullet);
                buf.transform.position = riffleStart.transform.position;
                buf.transform.rotation = transform.rotation;
                buf.GetComponent<Bullet>().setDirection(transform.forward);
                timer = 0;
                states = SniperState.patrol;
                break;
        }
    }