Open Menu gesture for ManoMotion (as in Hololens)

using UnityEngine;
using UnityEngine.Events;

public class OpenMenuGestureController : MonoBehaviour
{
    enum States
    {
        None,
        InitialClosedHand,
        OpenHand1
    }

    States state;
    int correctFrames = 0, wrongFrames = 0, normalDelay = 1, timeout = 20;

    public UnityEvent OnMenuOpen;

    private void Start()
    {
        ManomotionManager.OnManoMotionFrameProcessed += HandleManoMotionFrameUpdated;
    }

    private void OnDestroy()
    {
        ManomotionManager.OnManoMotionFrameProcessed -= HandleManoMotionFrameUpdated;
    }

    void HandleManoMotionFrameUpdated()
    {
        if (ManomotionManager.Instance.Hand_infos[0].hand_info.warning == Warning.WARNING_HAND_NOT_FOUND)
            return;

        switch (state)
        {
            case States.None:
                if (ManomotionManager.Instance.Hand_infos[0].hand_info.gesture_info.state == 13)
                    state = States.InitialClosedHand;
                break;
            case States.InitialClosedHand:
                if (ManomotionManager.Instance.Hand_infos[0].hand_info.gesture_info.state == 0
                    && ManomotionManager.Instance.Hand_infos[0].hand_info.gesture_info.hand_side == HandSide.Palmside)
                    correctFrames++;
                else
                    wrongFrames++;

                if (correctFrames > normalDelay)
                {
                    correctFrames = wrongFrames = 0;
                    state = States.OpenHand1;
                }

                if (wrongFrames > timeout)
                {
                    correctFrames = wrongFrames = 0;
                    state = States.None;
                }

                break;
            case States.OpenHand1:
                if (ManomotionManager.Instance.Hand_infos[0].hand_info.gesture_info.state == 0)
                    correctFrames++;
                else
                    wrongFrames++;

                if (correctFrames > normalDelay)
                {
                    correctFrames = wrongFrames = 0;
                    state = States.None;
                    OnMenuOpen?.Invoke();
                    enabled = false;
                }

                break;
            default:
                break;
        }
    }
}