/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 * All rights reserved.
 *
 * Licensed under the Oculus SDK License Agreement (the "License");
 * you may not use the Oculus SDK except in compliance with the License,
 * which is provided at the time of installation or download, or which
 * otherwise accompanies this software in either electronic or hard copy form.
 *
 * You may obtain a copy of the License at
 *
 * https://developer.oculus.com/licenses/oculussdk/
 *
 * Unless required by applicable law or agreed to in writing, the Oculus SDK
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Assertions;

public class HandsActiveChecker : MonoBehaviour
{
    [SerializeField]
    private GameObject _notificationPrefab = null;

    private GameObject _notification = null;
    private OVRCameraRig _cameraRig = null;
    private Transform _centerEye = null;

    private void Awake()
    {
        Assert.IsNotNull(_notificationPrefab);
        _notification = Instantiate(_notificationPrefab);
        StartCoroutine(GetCenterEye());
    }

    private void Update()
    {
        if (OVRPlugin.GetHandTrackingEnabled())
        {
            _notification.SetActive(false);
        }
        else
        {
            _notification.SetActive(true);
            if (_centerEye)
            {
                _notification.transform.position = _centerEye.position + _centerEye.forward * 0.5f;
                _notification.transform.rotation = _centerEye.rotation;
            }
        }
    }

    private IEnumerator GetCenterEye()
    {
        if ((_cameraRig = FindObjectOfType<OVRCameraRig>()) != null)
        {
            while (!_centerEye)
            {
                _centerEye = _cameraRig.centerEyeAnchor;
                yield return null;
            }
        }
    }
}