public class ABBuilder
{
    static readonly Windows.ConsoleWindow Console = new Windows.ConsoleWindow();
    private static readonly string Dest = Application.dataPath + "/AB";
    private static string _dataPath = Application.dataPath;

    [MenuItem("Tools/Copy Assets")]
    public static void CopyAssets()
    {
        var path = "C:/AB_Upload";
        var files = Directory.GetFiles(path);

        var imgPath = "Assets/AB_ref/ImageAsset.png";
        var vidPath = "Assets/AB_ref/VidAsset.mp4";

        var imgAsset = AssetDatabase.LoadAssetAtPath<Texture2D>(imgPath);
        var vidAsset = AssetDatabase.LoadAssetAtPath<VideoClip>(vidPath);
        var destFolderPath = "Assets/Data";

        foreach (var pre_assetPath in files)
        {
            var assetPath = pre_assetPath.Replace("\\", "/");
            Debug.LogFormat("Copying {0}", assetPath);

            if(string.IsNullOrEmpty(assetPath))continue;
            var extension = new FileInfo(assetPath).Extension;

            var assetDest = destFolderPath + assetPath.Substring(assetPath.LastIndexOf('/'));
            assetDest = AssetDatabase.GenerateUniqueAssetPath(assetDest);

            if (extension == ".png")
            {
                AssetDatabase.CopyAsset(AssetDatabase.GetAssetPath(imgAsset.GetInstanceID()), assetDest);
                File.Copy(assetPath, assetDest, true);
            }
            else if(extension == ".mp4")
            {
                AssetDatabase.CopyAsset(AssetDatabase.GetAssetPath(vidAsset.GetInstanceID()), assetDest);
                File.Copy(assetPath, assetDest, true);
            }
            else
            {
                continue;
            }
            Debug.LogFormat("Copied {0}", assetDest);
        }

        AssetDatabase.SaveAssets();
        AssetDatabase.Refresh();
    }

    [MenuItem("Tools/Build Asset Bundle from Data Folder")]
    public static void BuildAssetBundle()
    {
        AssetBundleBuild build = new AssetBundleBuild();
        build.assetBundleName = "data";

        string[] files = AssetDatabase.GetAllAssetPaths().ToList().Where(x => x.Contains("Assets/Data/")).ToArray();
        build.assetNames = files;
        BuildPipeline.BuildAssetBundles("Assets/AB", new AssetBundleBuild[1] { build }, BuildAssetBundleOptions.None, BuildTarget.StandaloneWindows64);
        //todo copy assetbundle to dest folder
    }

    public static void Start()
    {
        Console.Initialize();
        Console.SetTitle( "Test Server" );
        Application.logMessageReceived += HandleLog;
        var sw = new Stopwatch();
        sw.Start();
        Debug.Log(" ");
        Debug.Log("Start copying assets");

        CopyAssets();
        BuildAssetBundle();

        Debug.Log("Finished Building Asset Bundle.. took : " + sw.Elapsed);
        sw.Stop();
        Console.Shutdown();
    }

    //
    // Debug.Log* callback
    //
    //todo define logtype so we can filter all unesseary unity msgs
    static void HandleLog( string message, string stackTrace, LogType type )
    {
        if ( type == LogType.Warning )
            System.Console.ForegroundColor = ConsoleColor.Yellow;
        else if ( type == LogType.Error )
            System.Console.ForegroundColor = ConsoleColor.Red;
        else
            System.Console.ForegroundColor = ConsoleColor.White;

        System.Console.WriteLine( message );
    }
}