class TYTD.SDVideoDownload : IVideoDownload {
    private info;
    private tytd;
    private progress;
    private video_stream_url;

    private done=false;
    
    public SDVideoDownload(id)
    {
        this.info  = {
            Title = "",
		    Channel = "",
		    VideoId = TYTD.GetVideoId(id),
		    ChannelId = ""
        };
    }
    public setTYTD(tytd)
    {
        this.tytd = tytd;
        var id = this.info.VideoId;
        var path = /"Streams"/id.Substring(0,4)/id.Substring(4)/"ytmux.mp4";
         if(this.tytd.Storage.FileExists(path)) {
            this.done = true;
            return tytd;
        }

        var req = this.tytd.ManifestRequest(id).playerResponse;
        this.info.Title = req.videoDetails.title;
        this.info.Channel = req.videoDetails.author;
        this.info.ChannelId = req.videoDetails.channelId;

        this.tytd.PutVideoInfo(req.videoDetails);
        
        this.video_stream_url = req.streamingData.formats[0].url;
       
        return tytd;
    }
    public setProgress(p)
    {
        this.progress = p;
        this.progress(0.0);
    }
    public getVideo()
    {
        return this.info;
    }
    public Start()
    {
        for(var i = 0; i < 5; i++)
        {
        var req = {
            FollowRedirects = true,
            RequestHeaders = [
                            {
                                Key = "User-Agent",
                                
                                Value = "com.google.android.youtube/19.28.35 (Linux; U; Android 15; GB) gzip"
                            }
            ]
        };
        var resp = Net.Http.MakeRequest(this.video_stream_url,req);
        
        if(resp.StatusCode >= 200 && resp.StatusCode <= 299)
        {
            var id = this.info.VideoId;
            var path = /"Streams"/id.Substring(0,4)/id.Substring(4)/"ytmux.mp4";
            this.tytd.Storage.CreateDirectory(path.GetParent());
            var strm = this.tytd.Storage.OpenFile(path+".part","wb");
            var src = resp.ReadAsStream();
            Helpers.CopyToProgress(src,strm,this.progress,100.0);
            strm.Close();
            src.Close();
            this.tytd.Storage.MoveFile(path+".part",path);
            break;
        }
        else {
            var req = this.tytd.ManifestRequest(this.info.VideoId).playerResponse;
            this.video_stream_url = req.streamingData.formats[0].url;
        }
        }
    }
}