/*
 * 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;
using UnityEngine;

namespace Oculus.Interaction
{
    /// <summary>
    /// By adding BeginStart and EndStart at the beginning and end of Start, MonoBehaviours with
    /// OnEnable and OnDisable logic can wrap their contents within a _started flag and effectively
    /// skip over logic in those methods until after Start has been invoked.
    ///
    /// To not bypass the Unity Lifecycle, the enabled property is used to disable the most derived
    /// MonoBehaviour, invoke Start up the hierarchy chain, and finally re-enable the MonoBehaviour.
    /// </summary>
    public static class MonoBehaviourStartExtensions
    {
        public static void BeginStart(this MonoBehaviour monoBehaviour, ref bool started,
                                      Action baseStart = null)
        {
            if (!started)
            {
                monoBehaviour.enabled = false;
                started = true;
                baseStart?.Invoke();
                started = false;
            }
            else
            {
                baseStart?.Invoke();
            }
        }

        public static void EndStart(this MonoBehaviour monoBehaviour, ref bool started)
        {
            if (!started)
            {
                started = true;
                monoBehaviour.enabled = true;
            }
        }
    }
}