using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;

public class AutoSceneAdditiveLoad
    : MonoBehaviour
{
    public Object sceneObj;

    public void Start()
    {
        DontDestroyOnLoad(this.gameObject);
        StartCoroutine(DoLoadScene());
    }

    public void OnValidate()
    {
#if UNITY_EDITOR
        if (sceneObj != null)
        {
            var sceneAsset = sceneObj as UnityEditor.SceneAsset;
            if (sceneAsset == null)
                sceneObj = null;
        }
#endif
    }

    private IEnumerator DoLoadScene()
    {
        Debug.LogFormat("AutoSceneTransition: loading scene {0}", sceneObj.name);

        var time = System.DateTime.Now;
        var async = SceneManager.LoadSceneAsync(sceneObj.name, LoadSceneMode.Single);

        while (!async.isDone)
            yield return null;

        var delta = System.DateTime.Now - time;

        Debug.LogFormat("AutoSceneTransition: > load complete ({0:F2}s)", (float)delta.Seconds);
    }
}