using AngleSharp;
using AngleSharp.Dom;

public class YoutubeMusicValidator : UriBasedSongValidatorBase
{
    public override string UriValidatorRegex => @"^(https?://)?(music\.youtube\.com/watch\?v=|youtu\.be/)([a-zA-Z0-9_-]{11})";

    public override async Task<bool> CanExtractSongMetadataAsync(Uri songUri)
    {
        return this.CanValidateUri(songUri);
    }

    public override async Task<Song> ValidateAsync(Uri songUri)
    {
        var title = string.Empty;
        var artist = string.Empty;

        using(HttpClient httpClient = new HttpClient())
        {
            var response = await httpClient.GetAsync(songUri);
            var config = Configuration.Default.WithDefaultLoader();
            var context = BrowsingContext.New(config);
            using(var document = await context.OpenAsync(async req => req.Content(await response.Content.ReadAsStringAsync())))
            {
                // document.getElementsByTagName("ytmusic-player-queue-item")[0].getElementsByClassName("song-title")[0].innerHTML
                title = document.QuerySelector(".ytmusic-player-queue-item")?.QuerySelector(".song-title")?.InnerHtml;
                // document.getElementsByTagName("ytmusic-player-queue-item")[0].getElementsByClassName("byline")[0].innerHTML
                artist = document.QuerySelector(".ytmusic-player-queue-item")?.QuerySelector(".byline")?.InnerHtml;
            }
        }
        
        var song = new Song
        {
            Name = title,
            Artist = artist,
            Url = songUri.ToString(),
            Provider = SongProvider.YouTube,
            SpotifyId = this.LookupSpotifyId(title, artist)
        };

        return song;
    }
}