add_filter( 'streamtube/player/file/setup', function( $setup, $source ){

    if( ! array_key_exists( 'mediaid' , $setup ) ){
        return $setup;
    }

    $post_id = $setup['mediaid'];

    if( ! get_post_status( $post_id ) || array_key_exists( 'tracks' , $setup ) ){
        return $setup;
    }

    $default_subtitle   = strtolower(get_option( 'player_default_subtitle' ));

    $_tracks = array();

    // Get the video URL meta value
    $video_url = get_post_meta( $post_id, 'video_url', true );

    if( ! $video_url ){
        return $setup;
    }

    // Extract the YouTube ID from the video URL
    preg_match('/(?:youtube\.com\/(?:[^\/\n\s]+\/\S+\/|(?:v|e(?:mbed)?)\/|.*[?&]v=)|youtu\.be\/)([a-zA-Z0-9_-]{11})/', $video_url, $matches);

    if( ! $matches || ! isset( $matches[1] ) ){
        return $setup;
    }

    $youtube_id = $matches[1];

    // Directory where subtitle files are stored
    $subtitle_dir = WP_CONTENT_DIR . '/uploads/subtitles/' . $youtube_id;

    // Check if directory exists
    $subtitle_files = array();
    if( is_dir( $subtitle_dir ) ){
        // Scan the directory for .vtt files
        $subtitle_files = glob( $subtitle_dir . '/*.vtt' );
    }

    // Add local subtitle files if not already added
    if( $subtitle_files ){
        foreach ( $subtitle_files as $subtitle_file ) {
            $file_name = basename( $subtitle_file, '.vtt' );
            $file_parts = explode('.', $file_name);

            if( count( $file_parts ) >= 2 && $file_parts[0] === $youtube_id ){
                // Extract language code before the hyphen if present
                $language = explode('-', $file_parts[1])[0];
                $source = content_url( '/uploads/subtitles/' . $youtube_id . '/' . basename( $subtitle_file ) );

                // Check if this language is already added from meta
                $language_exists = false;
                foreach( $_tracks as $track ){
                    if( $track['language'] === $language ){
                        $language_exists = true;
                        break;
                    }
                }

                if( ! $language_exists ){
                    $_tracks[] = array(
                        'language' => $language,
                        'source'   => $source
                    );
                }
            }
        }
    }

    if( $_tracks ){
        for ( $i = 0; $i < count( $_tracks ); $i++) {

            $language = streamtube_core_get_language_by_code( strtolower( $_tracks[$i]['language'] ) );

            $track = array(
                'kind'      =>  'captions',
                'srclang'   =>  $_tracks[$i]['language'],
                'label'     =>  $language ? $language['name'] : '',
                'src'       =>  $_tracks[$i]['source']
            );

            if( ($default_subtitle == 'first' && $i == 0) || ( $default_subtitle == strtolower( $_tracks[$i]['language'] ) ) ){
                $track['default'] = true;
            }

            /**
             * Filter the track
             */
            $track = apply_filters( 'streamtube/core/post/player/track', $track, $setup, $source );

            $setup['tracks'][] = $track;
        }
    }

    return $setup;

}, 30, 2 );