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// Copyright (c) 2022-2023 Magic Leap, Inc. All Rights Reserved.
// Use of this file is governed by the Magic Leap 2 Software License Agreement, located here: https://www.magicleap.com/software-license-agreement-ml2  
// Terms and conditions applicable to third-party materials accompanying this distribution may also be found in the top-level NOTICE file appearing herein.
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using System;
using UnityEngine;

namespace MagicLeap.Spectator
{
    public class MLSpectatorFollow : MonoBehaviour
    {
        public event Action<Pose> onPoseUpdated = null;

        private Vector3 position = Vector3.zero;
        private Quaternion rotation = Quaternion.identity;

        void Update()
        {
            if (MLSpectator.Instance == null) return;
            //if (!transform.parent.hasChanged) return;

            bool parentTransformChanged = false;

            if (transform.parent.position != position)
            {
                parentTransformChanged = true;
                position = transform.parent.position;
            }

            if (transform.parent.rotation != rotation)
            {
                parentTransformChanged = true;
                rotation = transform.parent.rotation;
            }

            if (!parentTransformChanged) return;
            
            Pose pose = new Pose(transform.position, transform.rotation);
            onPoseUpdated?.Invoke(pose);
        }
    }
}