<?php
if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

final class SG7G_Renderer {
    public static function embed( int $post_id ): string {
        $type     = get_post_meta( $post_id, '_sg7g_media_type', true );
        $source   = get_post_meta( $post_id, '_sg7g_source', true );
        $url      = html_entity_decode( (string) get_post_meta( $post_id, '_sg7g_source_url', true ), ENT_QUOTES, 'UTF-8' );
        $file_id  = absint( get_post_meta( $post_id, '_sg7g_file_id', true ) );
        $autoplay = 'audio' === $type
            ? SG7G_Settings::enabled( 'autoplay_audio' )
            : SG7G_Settings::enabled( 'autoplay_video' );

        if ( in_array( $source, array( 'local_video', 'local_audio' ), true ) ) {
            $validation = SG7G_Meta_Boxes::validate_source( (string) $type, (string) $source, $url, $file_id );
            if ( is_wp_error( $validation ) ) {
                return self::source_error( $post_id, '', $validation->get_error_message() );
            }

            $file_url = $file_id ? wp_get_attachment_url( $file_id ) : '';
            if ( ! $file_url ) {
                return self::source_error( $post_id, '' );
            }
            return self::html5_media( 'audio' === $type ? 'audio' : 'video', $file_url, $autoplay );
        }

        if ( in_array( $source, array( 'external_video', 'external_audio' ), true ) ) {
            if ( ! $url || ! wp_http_validate_url( $url ) ) {
                return self::source_error( $post_id, $url );
            }
            return self::html5_media( 'external_audio' === $source ? 'audio' : 'video', $url, $autoplay );
        }

        $validation = SG7G_Meta_Boxes::validate_source( (string) $type, (string) $source, $url, $file_id );
        if ( is_wp_error( $validation ) ) {
            return self::source_error( $post_id, $url, $validation->get_error_message() );
        }

        if ( ! $url ) {
            return self::source_error( $post_id, '' );
        }

        $embed_url = self::embed_url( (string) $source, $url );
        if ( ! $embed_url ) {
            $oembed = wp_oembed_get( $url, array( 'width' => 1200 ) );
            if ( $oembed ) {
                $safe_oembed = wp_kses( $oembed, self::allowed_embed_html() );
                $deferred    = self::defer_oembed_iframes( $safe_oembed, get_the_title( $post_id ) );
                return self::lazy_oembed( $deferred, $safe_oembed, $url );
            }
            return self::source_error( $post_id, $url );
        }

        $frame_classes = self::embed_frame_classes( (string) $source, $url );

        return self::lazy_iframe(
            $embed_url,
            implode( ' ', $frame_classes ),
            get_the_title( $post_id ),
            $url
        );
    }

    /**
     * Resolve the canonical media URL for structured data and integrations.
     *
     * @return array{content_url?:string,embed_url?:string}
     */
    public static function resolved_media_url( int $post_id ): array {
        $type    = (string) get_post_meta( $post_id, '_sg7g_media_type', true );
        $source  = (string) get_post_meta( $post_id, '_sg7g_source', true );
        $file_id = absint( get_post_meta( $post_id, '_sg7g_file_id', true ) );
        $url     = html_entity_decode( (string) get_post_meta( $post_id, '_sg7g_source_url', true ), ENT_QUOTES, 'UTF-8' );

        $validation = SG7G_Meta_Boxes::validate_source( $type, $source, $url, $file_id );
        if ( is_wp_error( $validation ) ) {
            return array();
        }

        if ( in_array( $source, array( 'local_video', 'local_audio' ), true ) ) {
            $file_url = $file_id ? wp_get_attachment_url( $file_id ) : '';
            return $file_url ? array( 'content_url' => esc_url_raw( $file_url ) ) : array();
        }

        if ( in_array( $source, array( 'external_video', 'external_audio' ), true ) ) {
            return $url && wp_http_validate_url( $url ) ? array( 'content_url' => esc_url_raw( $url ) ) : array();
        }

        $embed_url = $url ? self::embed_url( $source, $url ) : '';
        return $embed_url ? array( 'embed_url' => esc_url_raw( $embed_url ) ) : array();
    }

    /**
     * Return source-aware classes so audio embeds can use their natural height
     * instead of the 16:9 video frame.
     */
    private static function embed_frame_classes( string $source, string $url ): array {
        $classes = array( 'sg7g-embed-frame', 'sg7g-embed-frame--' . sanitize_html_class( $source ) );
        $path    = trim( (string) wp_parse_url( $url, PHP_URL_PATH ), '/' );

        if ( 'spotify' === $source ) {
            $segments = self::normalized_segments( $path );
            if ( isset( $segments[0] ) && 'embed' === strtolower( $segments[0] ) ) {
                array_shift( $segments );
            }
            if ( isset( $segments[0] ) ) {
                $classes[] = 'sg7g-embed-frame--spotify-' . sanitize_html_class( $segments[0] );
            }
        } elseif ( 'apple_music' === $source ) {
            parse_str( (string) wp_parse_url( $url, PHP_URL_QUERY ), $query );
            $classes[] = isset( $query['i'] ) || str_contains( '/' . $path . '/', '/song/' )
                ? 'sg7g-embed-frame--apple-music-song'
                : 'sg7g-embed-frame--apple-music-collection';
        } elseif ( 'soundcloud' === $source ) {
            $classes[] = str_contains( '/' . $path . '/', '/sets/' )
                ? 'sg7g-embed-frame--soundcloud-set'
                : 'sg7g-embed-frame--soundcloud-track';
        }

        return array_values( array_unique( $classes ) );
    }

    private static function html5_media( string $type, string $url, bool $autoplay ): string {
        $attributes = array(
            'src'      => esc_url_raw( $url ),
            'preload'  => 'metadata',
            'autoplay' => $autoplay ? 'on' : '',
        );

        return 'audio' === $type
            ? wp_audio_shortcode( $attributes )
            : wp_video_shortcode( $attributes );
    }

    private static function embed_url( string $source, string $url ): string {
        $url  = html_entity_decode( $url, ENT_QUOTES, 'UTF-8' );
        $host = strtolower( (string) wp_parse_url( $url, PHP_URL_HOST ) );
        $path = trim( (string) wp_parse_url( $url, PHP_URL_PATH ), '/' );
        parse_str( (string) wp_parse_url( $url, PHP_URL_QUERY ), $query );

        switch ( $source ) {
            case 'youtube':
            case 'youtube_music':
                $id       = SG7G_Meta_Boxes::youtube_id( $url );
                $playlist = SG7G_Meta_Boxes::youtube_playlist_id( $url );
                if ( ! $id && ! $playlist ) {
                    return '';
                }

                $youtube_host = SG7G_Settings::enabled( 'youtube_nocookie' )
                    ? 'https://www.youtube-nocookie.com/embed/'
                    : 'https://www.youtube.com/embed/';
                $youtube_url = $id
                    ? $youtube_host . rawurlencode( $id )
                    : $youtube_host . 'videoseries';

                if ( $playlist ) {
                    $youtube_url = add_query_arg( 'list', $playlist, $youtube_url );
                }

                $youtube_autoplay = 'youtube_music' === $source
                    ? SG7G_Settings::enabled( 'autoplay_audio' )
                    : SG7G_Settings::enabled( 'autoplay_video' );

                return $youtube_autoplay ? add_query_arg( 'autoplay', '1', $youtube_url ) : $youtube_url;

            case 'vimeo':
                $vimeo_id = SG7G_Meta_Boxes::vimeo_id( $url );
                if ( ! $vimeo_id ) {
                    return '';
                }
                $vimeo_url  = 'https://player.vimeo.com/video/' . rawurlencode( $vimeo_id );
                $vimeo_hash = SG7G_Meta_Boxes::vimeo_hash( $url );
                if ( $vimeo_hash ) {
                    $vimeo_url = add_query_arg( 'h', $vimeo_hash, $vimeo_url );
                }
                return SG7G_Settings::enabled( 'autoplay_video' )
                    ? add_query_arg( 'autoplay', '1', $vimeo_url )
                    : $vimeo_url;

            case 'spotify':
                if ( ! self::host_matches( $host, 'open.spotify.com' ) ) {
                    return '';
                }
                $segments = self::normalized_segments( $path );
                if ( isset( $segments[0] ) && 'embed' === strtolower( $segments[0] ) ) {
                    array_shift( $segments );
                }
                $allowed = array( 'track', 'album', 'playlist', 'episode', 'show', 'artist' );
                if ( count( $segments ) >= 2 && in_array( $segments[0], $allowed, true ) ) {
                    return 'https://open.spotify.com/embed/' . rawurlencode( $segments[0] ) . '/' . rawurlencode( $segments[1] );
                }
                return '';

            case 'apple_music':
                if ( ! self::host_matches( $host, 'music.apple.com' ) || '' === $path ) {
                    return '';
                }
                if ( str_starts_with( $host, 'embed.' ) ) {
                    return esc_url_raw( $url );
                }
                return 'https://embed.music.apple.com/' . $path . ( $query ? '?' . http_build_query( $query ) : '' );

            case 'soundcloud':
                if ( ! self::host_matches( $host, 'soundcloud.com' ) ) {
                    return '';
                }
                if ( 'w.soundcloud.com' === $host && str_starts_with( $path, 'player' ) ) {
                    return esc_url_raw( $url );
                }
                return 'https://w.soundcloud.com/player/?url=' . rawurlencode( $url ) . '&auto_play=' . ( SG7G_Settings::enabled( 'autoplay_audio' ) ? 'true' : 'false' ) . '&visual=true';

            case 'deezer':
                if ( ! self::host_matches( $host, 'deezer.com' ) ) {
                    return '';
                }
                $segments = self::normalized_segments( $path );
                if ( isset( $segments[0], $segments[1] ) && 'widget' === $segments[0] && 'auto' === $segments[1] ) {
                    $segments = array_slice( $segments, 2 );
                }
                $allowed = array( 'track', 'album', 'playlist', 'artist', 'show', 'episode' );
                if ( isset( $segments[0], $segments[1] ) && in_array( $segments[0], $allowed, true ) ) {
                    $deezer_url = 'https://widget.deezer.com/widget/auto/' . rawurlencode( $segments[0] ) . '/' . rawurlencode( $segments[1] );
                    return SG7G_Settings::enabled( 'autoplay_audio' )
                        ? add_query_arg( 'autoplay', 'true', $deezer_url )
                        : $deezer_url;
                }
                return '';

        }

        return '';
    }

    private static function host_matches( string $host, string $domain ): bool {
        $host   = strtolower( trim( $host, '.' ) );
        $domain = strtolower( trim( $domain, '.' ) );

        return $host === $domain || str_ends_with( $host, '.' . $domain );
    }

    private static function normalized_segments( string $path ): array {
        $segments = array_values( array_filter( explode( '/', trim( $path, '/' ) ) ) );
        if ( isset( $segments[0] ) && ( preg_match( '/^intl-[a-z]{2}$/i', $segments[0] ) || preg_match( '/^[a-z]{2}(?:-[a-z]{2})?$/i', $segments[0] ) ) ) {
            array_shift( $segments );
        }
        return $segments;
    }

    /**
     * Return the compact media-type icon used beside card view counts.
     */
    public static function media_type_icon( string $media_type ): string {
        if ( 'audio' === $media_type ) {
            return '<span class="sg7g-card__type-icon sg7g-card__type-icon--audio" aria-hidden="true"><svg viewBox="0 0 24 24" focusable="false"><path d="M4.5 9.5v5M8.25 6.5v11M12 8.5v7M15.75 5v14M19.5 9.5v5"/></svg></span>';
        }

        return '<span class="sg7g-card__type-icon sg7g-card__type-icon--video" aria-hidden="true"><svg viewBox="0 0 24 24" focusable="false"><path d="M8.25 5.75 18 12l-9.75 6.25V5.75Z"/></svg></span>';
    }

    /**
     * Return the compact view/like metric group used inside archive media cards.
     */
    public static function card_metrics_markup( int $post_id, string $extra_class = '' ): string {
        $class = trim( 'sg7g-card__metrics ' . sanitize_html_class( $extra_class ) );
        $show_likes = SG7G_Settings::enabled( 'show_likes' );

        ob_start();
        ?>
        <span class="<?php echo esc_attr( $class ); ?>" aria-label="<?php echo esc_attr__( 'Loading live interaction data…', '7sgaleri' ); ?>">
            <span class="sg7g-card__views-icon" aria-hidden="true"></span>
            <span class="sg7g-card__views-text" data-sg7g-view-post="<?php echo esc_attr( (string) $post_id ); ?>">…</span>
            <?php if ( $show_likes ) : ?>
                <?php echo SG7G_Likes::icon(); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- Static trusted SVG markup. ?>
                <span class="sg7g-card__likes-text" data-sg7g-like-count="<?php echo esc_attr( (string) $post_id ); ?>">…</span>
            <?php endif; ?>
        </span>
        <?php
        return (string) ob_get_clean();
    }

    /** Return a card title shortened to the administrator-defined character limit. */
    public static function card_title( int $post_id ): string {
        $title = (string) get_the_title( $post_id );
        $limit = min( 200, max( 0, (int) SG7G_Settings::get( 'card_title_limit', 48 ) ) );
        if ( 0 === $limit ) {
            return $title;
        }

        $length = function_exists( 'mb_strlen' ) ? mb_strlen( $title ) : strlen( $title );
        if ( $length <= $limit ) {
            return $title;
        }

        $short = function_exists( 'mb_substr' ) ? mb_substr( $title, 0, $limit ) : substr( $title, 0, $limit );
        return rtrim( $short ) . '…';
    }

    public static function card( int $post_id = 0 ): void {
        static $archive_card_index = 0;

        $post_id     = $post_id ?: get_the_ID();
        $media_type  = (string) get_post_meta( $post_id, '_sg7g_media_type', true );
        $thumbnail   = get_post_thumbnail_id( $post_id );
        $link_label  = sprintf(
            /* translators: %s: Content title. */
            __( 'Open %s', '7sgaleri' ),
            get_the_title( $post_id )
        );

        $is_archive_context = is_post_type_archive( 'sg7g_media' ) || is_tax( array( 'sg7g_category', 'sg7g_tag' ) );
        $is_first_archive_card = $is_archive_context && 0 === $archive_card_index;
        $featured_visible = $is_first_archive_card
            && is_post_type_archive( 'sg7g_media' )
            && ! is_tax()
            && '' === SG7G_Search::request_term()
            && max( 1, (int) get_query_var( 'paged' ) ) <= 1
            && ! empty( SG7G_Featured::display_ids() );
        $is_archive_lead = $is_first_archive_card && ! $featured_visible;

        if ( $is_archive_context ) {
            $archive_card_index++;
        }

        $card_class = 'sg7g-card sg7g-card--' . ( 'audio' === $media_type ? 'audio' : 'video' );
        ?>
        <article <?php post_class( $card_class, $post_id ); ?>>
            <a class="sg7g-card__media" href="<?php echo esc_url( get_permalink( $post_id ) ); ?>" aria-label="<?php echo esc_attr( $link_label ); ?>">
                <?php if ( $thumbnail ) : ?>
                    <?php
                    echo wp_kses_post(
                        wp_get_attachment_image(
                            $thumbnail,
                            'large',
                            false,
                            array(
                                'alt'           => get_the_title( $post_id ),
                                'loading'       => $is_archive_lead ? 'eager' : 'lazy',
                                'fetchpriority' => $is_archive_lead ? 'high' : 'auto',
                                'decoding'      => 'async',
                                'sizes'         => '(min-width: 1320px) 25vw, (min-width: 621px) 50vw, 100vw',
                            )
                        )
                    );
                    ?>
                <?php else : ?>
                    <span class="sg7g-card__placeholder" aria-hidden="true"></span>
                <?php endif; ?>
                <span class="sg7g-card__media-icon" aria-hidden="true">
                    <?php echo self::media_type_icon( $media_type ); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- Static trusted SVG markup. ?>
                </span>
                <?php echo self::card_metrics_markup( $post_id, 'sg7g-card__metrics--overlay' ); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- Escaped inside renderer. ?>
            </a>
            <div class="sg7g-card__body">
                <h2 class="sg7g-card__title"><a href="<?php echo esc_url( get_permalink( $post_id ) ); ?>" title="<?php echo esc_attr( get_the_title( $post_id ) ); ?>"><?php echo esc_html( self::card_title( $post_id ) ); ?></a></h2>
            </div>
        </article>
        <?php
    }

    /**
     * Render gallery tags in the same plain hashtag pattern used by the theme.
     */
    public static function tags( int $post_id = 0 ): void {
        $post_id = $post_id ?: get_the_ID();
        $tags     = get_the_terms( $post_id, 'sg7g_tag' );

        if ( is_wp_error( $tags ) || empty( $tags ) ) {
            return;
        }
        ?>
        <nav class="sg7g-tags" aria-label="<?php esc_attr_e( 'Tags', '7sgaleri' ); ?>">
            <?php foreach ( $tags as $tag ) :
                $tag_link = get_term_link( $tag );
                if ( is_wp_error( $tag_link ) ) {
                    continue;
                }
                ?>
                <a href="<?php echo esc_url( $tag_link ); ?>">#<?php echo esc_html( $tag->name ); ?></a>
            <?php endforeach; ?>
        </nav>
        <?php
    }

    /**
     * Render archive pagination using the configured pagination mode.
     */
    public static function pagination(): void {
        global $wp_query;

        $total = isset( $wp_query->max_num_pages ) ? (int) $wp_query->max_num_pages : 0;
        if ( $total < 2 ) {
            return;
        }

        $current = max( 1, (int) get_query_var( 'paged' ) );
        $mode    = (string) SG7G_Settings::get( 'pagination_mode', 'numbers' );

        if ( 'numbers' === $mode ) {
            $links = paginate_links(
                array(
                    'base'      => str_replace( 999999999, '%#%', esc_url( get_pagenum_link( 999999999 ) ) ),
                    'format'    => '?paged=%#%',
                    'current'   => $current,
                    'total'     => $total,
                    'mid_size'  => 1,
                    'end_size'  => 1,
                    'prev_text' => '<span aria-hidden="true">←</span><span class="sg7g-visually-hidden">' . esc_html__( 'Previous', '7sgaleri' ) . '</span>',
                    'next_text' => '<span class="sg7g-visually-hidden">' . esc_html__( 'Next', '7sgaleri' ) . '</span><span aria-hidden="true">→</span>',
                    'add_args'  => SG7G_Search::request_term() ? array( 'sg7q' => SG7G_Search::request_term() ) : array(),
                    'type'      => 'array',
                )
            );

            if ( empty( $links ) || ! is_array( $links ) ) {
                return;
            }
            ?>
            <nav class="sg7g-pagination" aria-label="<?php esc_attr_e( 'Gallery pages', '7sgaleri' ); ?>">
                <?php foreach ( $links as $link ) : ?>
                    <?php echo wp_kses_post( $link ); ?>
                <?php endforeach; ?>
            </nav>
            <?php
            return;
        }

        if ( $current >= $total ) {
            return;
        }

        $next_page = $current + 1;
        $next_url  = get_pagenum_link( $next_page );
        if ( SG7G_Search::request_term() ) {
            $next_url = add_query_arg( 'sg7q', SG7G_Search::request_term(), $next_url );
        }

        $is_infinite = 'infinite' === $mode;
        ?>
        <nav
            class="sg7g-progressive-pagination sg7g-progressive-pagination--<?php echo esc_attr( $is_infinite ? 'infinite' : 'load-more' ); ?>"
            data-sg7g-progressive-pagination
            data-sg7g-next-page="<?php echo esc_attr( (string) $next_page ); ?>"
            aria-label="<?php esc_attr_e( 'More gallery content', '7sgaleri' ); ?>"
        >
            <?php if ( $is_infinite ) : ?>
                <span class="sg7g-infinite-sentinel" data-sg7g-infinite-sentinel aria-hidden="true"></span>
            <?php endif; ?>
            <a class="sg7g-load-more" href="<?php echo esc_url( $next_url ); ?>" data-sg7g-load-more>
                <?php esc_html_e( 'Load More', '7sgaleri' ); ?>
            </a>
            <span class="sg7g-progressive-pagination__status" data-sg7g-pagination-status aria-live="polite" aria-atomic="true"></span>
        </nav>
        <?php
    }

    private static function lazy_iframe( string $src, string $classes, string $title, string $source_url ): string {
        $src        = esc_url( $src );
        $title      = esc_attr( $title );
        $source_url = esc_url( $source_url );

        return sprintf(
            '<div class="%1$s sg7g-lazy-embed" data-sg7g-lazy-embed><span class="sg7g-embed-status sg7g-visually-hidden" data-sg7g-embed-status aria-live="polite">%2$s</span><iframe data-sg7g-src="%3$s" loading="lazy" allow="autoplay; clipboard-write; encrypted-media; fullscreen; picture-in-picture" allowfullscreen referrerpolicy="strict-origin-when-cross-origin" title="%4$s"></iframe><a class="sg7g-embed-fallback" data-sg7g-embed-fallback href="%5$s" target="_blank" rel="noopener noreferrer">%6$s</a><noscript><iframe src="%3$s" loading="lazy" allow="autoplay; clipboard-write; encrypted-media; fullscreen; picture-in-picture" allowfullscreen referrerpolicy="strict-origin-when-cross-origin" title="%4$s"></iframe><p><a href="%5$s" target="_blank" rel="noopener noreferrer">%6$s</a></p></noscript></div>',
            esc_attr( $classes ),
            esc_html__( 'Loading player…', '7sgaleri' ),
            $src,
            $title,
            $source_url ?: $src,
            esc_html__( 'Open content at source', '7sgaleri' )
        );
    }

    private static function lazy_oembed( string $deferred, string $original, string $source_url ): string {
        return sprintf(
            '<div class="sg7g-oembed sg7g-lazy-embed" data-sg7g-lazy-embed><span class="sg7g-embed-status sg7g-visually-hidden" data-sg7g-embed-status aria-live="polite">%1$s</span>%2$s<a class="sg7g-embed-fallback" data-sg7g-embed-fallback href="%3$s" target="_blank" rel="noopener noreferrer">%4$s</a><noscript>%5$s<p><a href="%3$s" target="_blank" rel="noopener noreferrer">%4$s</a></p></noscript></div>',
            esc_html__( 'Loading player…', '7sgaleri' ),
            $deferred,
            esc_url( $source_url ),
            esc_html__( 'Open content at source', '7sgaleri' ),
            $original
        );
    }

    private static function defer_oembed_iframes( string $html, string $title ): string {
        if ( ! class_exists( 'WP_HTML_Tag_Processor' ) ) {
            return $html;
        }

        $processor = new WP_HTML_Tag_Processor( $html );
        $changed   = false;

        while ( $processor->next_tag( 'iframe' ) ) {
            $src = html_entity_decode( (string) $processor->get_attribute( 'src' ), ENT_QUOTES, 'UTF-8' );
            $src = esc_url( $src );

            if ( '' === $src ) {
                continue;
            }

            $processor->remove_attribute( 'src' );
            $processor->set_attribute( 'data-sg7g-src', $src );
            $processor->set_attribute( 'loading', 'lazy' );

            if ( ! $processor->get_attribute( 'title' ) ) {
                $processor->set_attribute( 'title', $title );
            }
            if ( ! $processor->get_attribute( 'referrerpolicy' ) ) {
                $processor->set_attribute( 'referrerpolicy', 'strict-origin-when-cross-origin' );
            }
            if ( ! $processor->get_attribute( 'allow' ) ) {
                $processor->set_attribute( 'allow', 'autoplay; clipboard-write; encrypted-media; fullscreen; picture-in-picture' );
            }
            if ( null === $processor->get_attribute( 'allowfullscreen' ) ) {
                $processor->set_attribute( 'allowfullscreen', '' );
            }

            $changed = true;
        }

        return $changed ? $processor->get_updated_html() : $html;
    }

    private static function source_error( int $post_id, string $url, string $message = '' ): string {
        $message = trim( $message );
        if ( '' === $message ) {
            $message = trim( (string) get_post_meta( $post_id, '_sg7g_source_error', true ) );
        }
        if ( '' === $message ) {
            $message = __( 'No valid media source was found for this content.', '7sgaleri' );
        }

        $link = '';
        if ( $url && wp_http_validate_url( $url ) ) {
            $link = sprintf(
                ' <a href="%1$s" target="_blank" rel="noopener noreferrer">%2$s</a>',
                esc_url( $url ),
                esc_html__( 'Open at source', '7sgaleri' )
            );
        }

        return '<div class="sg7g-source-error" role="status"><p>' . esc_html( $message ) . $link . '</p></div>';
    }

    private static function allowed_embed_html(): array {
        return array(
            'iframe' => array(
                'src'             => true,
                'width'           => true,
                'height'          => true,
                'frameborder'     => true,
                'allow'           => true,
                'allowfullscreen' => true,
                'loading'         => true,
                'title'           => true,
                'data-sg7g-src'    => true,
                'referrerpolicy'  => true,
                'class'           => true,
            ),
            'blockquote' => array( 'class' => true, 'data-secret' => true ),
            'a' => array( 'href' => true, 'target' => true, 'rel' => true ),
            'p' => array(),
            'div' => array( 'class' => true, 'style' => true ),
            'span' => array( 'class' => true, 'style' => true ),
        );
    }
}