func TYTD.GetVideoId(v)
{
    func IsValidId(_v)
                {
                    if(_v.Count != 11) return false;
                    each(var item : _v)
                    {
                        if(!(item.IsLetter() || item.IsDigit() || item == '-' || item == '_')) return false;
                    }
                    return true;
                }
                if(TypeOf(v) != "String") return null;
                if(IsValidId(v)) return v;
                each(var __re : ["youtube\\..+?/watch.*?v=(.*?)(?:&|/|$)","youtu\\.be/(.*?)(?:\\?|&|/|$)","youtube\\..+?/embed/(.*?)(?:\\?|&|/|$)","youtube\\..+?/shorts/(.*?)(?:\\?|&|/|$)","youtube\\..+?/live/(.*?)(?:\\?|&|/|$)"])
                {
                    var __r = new Regex(__re);
                    var __s = __r.Search(v);
                    if(__s.Count == 2)
                    {
                        __r=__s[1].Text;
                        if(IsValidId(__r))
                        {
                            return __r;
                        }
                    }
                }
                return null;

}

func TYTD.GetPlaylistId(pid)
{
    func IsValidId(v)
                {
                    if(v.Count < 2) return false;
                    each(var item : v)
                    {
                        if(!(item.IsLetter() || item.IsDigit() || item == '-' || item == '_')) return false;
                    }
                    return true;
                }
                if(TypeOf(pid) != "String") return null;
                if(IsValidId(pid)) return pid;
                each(var __re : ["youtube\\..+?/playlist.*?list=(.*?)(?:&|/|$)","youtube\\..+?/watch.*?list=(.*?)(?:&|/|$)","youtu\\.be/.*?/.*?list=(.*?)(?:&|/|$)","youtube\\..+?/embed/.*?/.*?list=(.*?)(?:&|/|$)"])
                {
                    var __r = new Regex(__re);
                    var __s = __r.Search(pid);
                    if(__s.Count == 2)
                    {
                        __r=__s[1].Text;
                        if(IsValidId(__r))
                        {
                            return __r;
                        }
                    }
                }
                return null;
}
func TYTD.GetChannelId(cid)
{
        func IsValidId(v)
                {
                    if(v.Count != 24) return false;
                    if(!v.StartsWith("UC")) return false;
                    each(var item : v)
                    {
                        if(!(item.IsLetter() || item.IsDigit() || item == '-' || item == '_')) return false;
                    }
                    return true;
                }
                if(TypeOf(cid) != "String") return null;
                if(IsValidId(cid)) return cid;
                each(var __re : ["youtube\\..+?/channel/(.*?)(?:\\?|&|/|$)"])
                {
                    var __r = new Regex(__re);
                    var __s = __r.Search(cid);
                    if(__s.Count == 2)
                    {
                        __r=__s[1].Text;
                        if(IsValidId(__r))
                        {
                            return __r;
                        }
                    }
                }
                return null;

}

func TYTD.CreateYouTubeTempPlaylist(ids)
{
    var url = "https://www.youtube.com/watch_videos?video_ids=";
    var first=true;
    each(var item : ids)
    {
        if(!first) url += $"{url},{Net.Http.UrlEncode(item)}";
        else
            url += Net.Http.UrlEncode(item);
        first=false;
    }
    return url;
}
func TYTD.GetYouTubeTempPlaylistRedirect(url)
{
    if(url.Contains("/watch_videos?") && url.Contains("video_ids="))
    {
        var queryPart = url.Split("?",true,2);
        return $"/watch_videos?{queryPart[1]}";
    }
    return null;
}
func TYTD.GetYouTubeTempPlaylist(url)
{
    if(url.Contains("/watch_videos?") && url.Contains("video_ids="))
    {
        var queryPart = url.Split("?",true,2);
        if(queryPart.Length == 2)
        {
            var queryParms =queryPart[1].Split("&");
            
            each(var item : queryParms)
            {
                const vals = item.Split("=",true,2);
                if(vals.Length == 2 && vals[0] == "video_ids")
                {
                    return Net.Http.UrlDecode(vals[1]).Split(",");

                }
            }
        }
    }
    return null;
}