<?php
/**
 * Track custom post type.
 *
 * @package WP_FediStream
 */

namespace WP_FediStream\PostTypes;

// Prevent direct file access.
if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

/**
 * Track post type class.
 *
 * Handles registration and management of individual tracks.
 */
class Track extends AbstractPostType {

    /**
     * Post type key.
     *
     * @var string
     */
    protected string $post_type = 'fedistream_track';

    /**
     * Meta key prefix.
     *
     * @var string
     */
    private const META_PREFIX = '_fedistream_track_';

    /**
     * Constructor.
     */
    public function __construct() {
        parent::__construct();
        add_action( 'save_post_fedistream_track', array( $this, 'update_album_on_save' ), 20, 2 );
    }

    /**
     * Register the post type.
     *
     * @return void
     */
    public function register(): void {
        $labels = array(
            'name'                  => _x( 'Tracks', 'Post type general name', 'wp-fedistream' ),
            'singular_name'         => _x( 'Track', 'Post type singular name', 'wp-fedistream' ),
            'menu_name'             => _x( 'Tracks', 'Admin Menu text', 'wp-fedistream' ),
            'name_admin_bar'        => _x( 'Track', 'Add New on Toolbar', 'wp-fedistream' ),
            'add_new'               => __( 'Add New', 'wp-fedistream' ),
            'add_new_item'          => __( 'Add New Track', 'wp-fedistream' ),
            'new_item'              => __( 'New Track', 'wp-fedistream' ),
            'edit_item'             => __( 'Edit Track', 'wp-fedistream' ),
            'view_item'             => __( 'View Track', 'wp-fedistream' ),
            'all_items'             => __( 'All Tracks', 'wp-fedistream' ),
            'search_items'          => __( 'Search Tracks', 'wp-fedistream' ),
            'parent_item_colon'     => __( 'Parent Tracks:', 'wp-fedistream' ),
            'not_found'             => __( 'No tracks found.', 'wp-fedistream' ),
            'not_found_in_trash'    => __( 'No tracks found in Trash.', 'wp-fedistream' ),
            'featured_image'        => _x( 'Track Artwork', 'Overrides the "Featured Image" phrase', 'wp-fedistream' ),
            'set_featured_image'    => _x( 'Set track artwork', 'Overrides the "Set featured image" phrase', 'wp-fedistream' ),
            'remove_featured_image' => _x( 'Remove track artwork', 'Overrides the "Remove featured image" phrase', 'wp-fedistream' ),
            'use_featured_image'    => _x( 'Use as track artwork', 'Overrides the "Use as featured image" phrase', 'wp-fedistream' ),
            'archives'              => _x( 'Track archives', 'The post type archive label', 'wp-fedistream' ),
            'insert_into_item'      => _x( 'Insert into track', 'Overrides the "Insert into post" phrase', 'wp-fedistream' ),
            'uploaded_to_this_item' => _x( 'Uploaded to this track', 'Overrides the "Uploaded to this post" phrase', 'wp-fedistream' ),
            'filter_items_list'     => _x( 'Filter tracks list', 'Screen reader text', 'wp-fedistream' ),
            'items_list_navigation' => _x( 'Tracks list navigation', 'Screen reader text', 'wp-fedistream' ),
            'items_list'            => _x( 'Tracks list', 'Screen reader text', 'wp-fedistream' ),
        );

        $args = array(
            'labels'             => $labels,
            'public'             => true,
            'publicly_queryable' => true,
            'show_ui'            => true,
            'show_in_menu'       => false, // Will be added to custom menu.
            'query_var'          => true,
            'rewrite'            => array( 'slug' => 'tracks' ),
            'capability_type'    => array( 'fedistream_track', 'fedistream_tracks' ),
            'map_meta_cap'       => true,
            'has_archive'        => true,
            'hierarchical'       => false,
            'menu_position'      => null,
            'menu_icon'          => 'dashicons-format-audio',
            'supports'           => array( 'title', 'editor', 'thumbnail', 'revisions' ),
            'show_in_rest'       => true,
            'rest_base'          => 'tracks',
        );

        register_post_type( $this->post_type, $args );
    }

    /**
     * Add meta boxes.
     *
     * @return void
     */
    public function add_meta_boxes(): void {
        add_meta_box(
            'fedistream_track_audio',
            __( 'Audio File', 'wp-fedistream' ),
            array( $this, 'render_audio_meta_box' ),
            $this->post_type,
            'normal',
            'high'
        );

        add_meta_box(
            'fedistream_track_info',
            __( 'Track Information', 'wp-fedistream' ),
            array( $this, 'render_info_meta_box' ),
            $this->post_type,
            'normal',
            'high'
        );

        add_meta_box(
            'fedistream_track_album',
            __( 'Album', 'wp-fedistream' ),
            array( $this, 'render_album_meta_box' ),
            $this->post_type,
            'side',
            'high'
        );

        add_meta_box(
            'fedistream_track_artists',
            __( 'Artists', 'wp-fedistream' ),
            array( $this, 'render_artists_meta_box' ),
            $this->post_type,
            'side',
            'default'
        );

        add_meta_box(
            'fedistream_track_codes',
            __( 'Track Codes', 'wp-fedistream' ),
            array( $this, 'render_codes_meta_box' ),
            $this->post_type,
            'side',
            'default'
        );
    }

    /**
     * Render audio file meta box.
     *
     * @param \WP_Post $post Post object.
     * @return void
     */
    public function render_audio_meta_box( \WP_Post $post ): void {
        wp_nonce_field( 'fedistream_track_save', 'fedistream_track_nonce' );

        $audio_file   = get_post_meta( $post->ID, self::META_PREFIX . 'audio_file', true );
        $audio_format = get_post_meta( $post->ID, self::META_PREFIX . 'audio_format', true );
        $duration     = get_post_meta( $post->ID, self::META_PREFIX . 'duration', true );

        wp_enqueue_media();
        ?>
        <div class="fedistream-audio-upload">
            <p>
                <label for="fedistream_track_audio_file"><?php esc_html_e( 'Audio File', 'wp-fedistream' ); ?></label>
            </p>
            <input type="hidden" name="fedistream_track_audio_file" id="fedistream_track_audio_file" value="<?php echo esc_attr( $audio_file ); ?>">
            <div id="fedistream-audio-preview">
                <?php if ( $audio_file ) : ?>
                    <?php
                    $audio_url = wp_get_attachment_url( $audio_file );
                    if ( $audio_url ) :
                        ?>
                        <audio controls style="width: 100%;">
                            <source src="<?php echo esc_url( $audio_url ); ?>" type="audio/<?php echo esc_attr( $audio_format ?: 'mpeg' ); ?>">
                        </audio>
                        <p><strong><?php echo esc_html( basename( get_attached_file( $audio_file ) ) ); ?></strong></p>
                    <?php endif; ?>
                <?php endif; ?>
            </div>
            <p>
                <button type="button" class="button" id="fedistream-upload-audio"><?php esc_html_e( 'Select Audio File', 'wp-fedistream' ); ?></button>
                <button type="button" class="button" id="fedistream-remove-audio" style="<?php echo $audio_file ? '' : 'display:none;'; ?>"><?php esc_html_e( 'Remove', 'wp-fedistream' ); ?></button>
            </p>
            <p class="description"><?php esc_html_e( 'Supported formats: MP3, WAV, FLAC, OGG', 'wp-fedistream' ); ?></p>
        </div>

        <table class="form-table">
            <tr>
                <th scope="row">
                    <label for="fedistream_track_audio_format"><?php esc_html_e( 'Audio Format', 'wp-fedistream' ); ?></label>
                </th>
                <td>
                    <select name="fedistream_track_audio_format" id="fedistream_track_audio_format">
                        <option value=""><?php esc_html_e( '— Auto-detect —', 'wp-fedistream' ); ?></option>
                        <option value="mp3" <?php selected( $audio_format, 'mp3' ); ?>>MP3</option>
                        <option value="wav" <?php selected( $audio_format, 'wav' ); ?>>WAV</option>
                        <option value="flac" <?php selected( $audio_format, 'flac' ); ?>>FLAC</option>
                        <option value="ogg" <?php selected( $audio_format, 'ogg' ); ?>>OGG</option>
                    </select>
                </td>
            </tr>
            <tr>
                <th scope="row">
                    <label for="fedistream_track_duration"><?php esc_html_e( 'Duration (seconds)', 'wp-fedistream' ); ?></label>
                </th>
                <td>
                    <input type="number" name="fedistream_track_duration" id="fedistream_track_duration" value="<?php echo esc_attr( $duration ); ?>" min="0" class="small-text">
                    <span id="fedistream-duration-display">
                        <?php
                        if ( $duration ) {
                            printf(
                                /* translators: %s: formatted duration */
                                esc_html__( '(%s)', 'wp-fedistream' ),
                                esc_html( gmdate( 'i:s', (int) $duration ) )
                            );
                        }
                        ?>
                    </span>
                    <p class="description"><?php esc_html_e( 'Auto-detected from audio file if available.', 'wp-fedistream' ); ?></p>
                </td>
            </tr>
        </table>

        <script>
        jQuery(document).ready(function($) {
            var mediaUploader;

            $('#fedistream-upload-audio').on('click', function(e) {
                e.preventDefault();

                if (mediaUploader) {
                    mediaUploader.open();
                    return;
                }

                mediaUploader = wp.media({
                    title: '<?php echo esc_js( __( 'Select Audio File', 'wp-fedistream' ) ); ?>',
                    button: { text: '<?php echo esc_js( __( 'Use this file', 'wp-fedistream' ) ); ?>' },
                    library: { type: 'audio' },
                    multiple: false
                });

                mediaUploader.on('select', function() {
                    var attachment = mediaUploader.state().get('selection').first().toJSON();
                    $('#fedistream_track_audio_file').val(attachment.id);
                    $('#fedistream-audio-preview').html(
                        '<audio controls style="width: 100%;"><source src="' + attachment.url + '" type="' + attachment.mime + '"></audio>' +
                        '<p><strong>' + attachment.filename + '</strong></p>'
                    );
                    $('#fedistream-remove-audio').show();

                    // Auto-detect format.
                    var ext = attachment.filename.split('.').pop().toLowerCase();
                    if (['mp3', 'wav', 'flac', 'ogg'].indexOf(ext) !== -1) {
                        $('#fedistream_track_audio_format').val(ext);
                    }
                });

                mediaUploader.open();
            });

            $('#fedistream-remove-audio').on('click', function(e) {
                e.preventDefault();
                $('#fedistream_track_audio_file').val('');
                $('#fedistream-audio-preview').html('');
                $(this).hide();
            });

            // Duration display.
            $('#fedistream_track_duration').on('change', function() {
                var seconds = parseInt($(this).val(), 10);
                if (seconds > 0) {
                    var mins = Math.floor(seconds / 60);
                    var secs = seconds % 60;
                    $('#fedistream-duration-display').text('(' + mins + ':' + (secs < 10 ? '0' : '') + secs + ')');
                } else {
                    $('#fedistream-duration-display').text('');
                }
            });
        });
        </script>
        <?php
    }

    /**
     * Render track info meta box.
     *
     * @param \WP_Post $post Post object.
     * @return void
     */
    public function render_info_meta_box( \WP_Post $post ): void {
        $track_number   = get_post_meta( $post->ID, self::META_PREFIX . 'number', true );
        $disc_number    = get_post_meta( $post->ID, self::META_PREFIX . 'disc_number', true );
        $bpm            = get_post_meta( $post->ID, self::META_PREFIX . 'bpm', true );
        $key            = get_post_meta( $post->ID, self::META_PREFIX . 'key', true );
        $explicit       = get_post_meta( $post->ID, self::META_PREFIX . 'explicit', true );
        $preview_start  = get_post_meta( $post->ID, self::META_PREFIX . 'preview_start', true );
        $preview_duration = get_post_meta( $post->ID, self::META_PREFIX . 'preview_duration', true );

        $musical_keys = array(
            ''     => __( '— Select Key —', 'wp-fedistream' ),
            'C'    => 'C Major',
            'Cm'   => 'C Minor',
            'C#'   => 'C# Major',
            'C#m'  => 'C# Minor',
            'D'    => 'D Major',
            'Dm'   => 'D Minor',
            'D#'   => 'D# Major',
            'D#m'  => 'D# Minor',
            'E'    => 'E Major',
            'Em'   => 'E Minor',
            'F'    => 'F Major',
            'Fm'   => 'F Minor',
            'F#'   => 'F# Major',
            'F#m'  => 'F# Minor',
            'G'    => 'G Major',
            'Gm'   => 'G Minor',
            'G#'   => 'G# Major',
            'G#m'  => 'G# Minor',
            'A'    => 'A Major',
            'Am'   => 'A Minor',
            'A#'   => 'A# Major',
            'A#m'  => 'A# Minor',
            'B'    => 'B Major',
            'Bm'   => 'B Minor',
        );
        ?>
        <table class="form-table">
            <tr>
                <th scope="row">
                    <label for="fedistream_track_number"><?php esc_html_e( 'Track Number', 'wp-fedistream' ); ?></label>
                </th>
                <td>
                    <input type="number" name="fedistream_track_number" id="fedistream_track_number" value="<?php echo esc_attr( $track_number ); ?>" min="1" max="999" class="small-text">
                </td>
            </tr>
            <tr>
                <th scope="row">
                    <label for="fedistream_track_disc_number"><?php esc_html_e( 'Disc Number', 'wp-fedistream' ); ?></label>
                </th>
                <td>
                    <input type="number" name="fedistream_track_disc_number" id="fedistream_track_disc_number" value="<?php echo esc_attr( $disc_number ?: 1 ); ?>" min="1" max="99" class="small-text">
                </td>
            </tr>
            <tr>
                <th scope="row">
                    <label for="fedistream_track_bpm"><?php esc_html_e( 'BPM', 'wp-fedistream' ); ?></label>
                </th>
                <td>
                    <input type="number" name="fedistream_track_bpm" id="fedistream_track_bpm" value="<?php echo esc_attr( $bpm ); ?>" min="20" max="300" class="small-text">
                    <p class="description"><?php esc_html_e( 'Beats per minute (tempo).', 'wp-fedistream' ); ?></p>
                </td>
            </tr>
            <tr>
                <th scope="row">
                    <label for="fedistream_track_key"><?php esc_html_e( 'Musical Key', 'wp-fedistream' ); ?></label>
                </th>
                <td>
                    <select name="fedistream_track_key" id="fedistream_track_key">
                        <?php foreach ( $musical_keys as $value => $label ) : ?>
                            <option value="<?php echo esc_attr( $value ); ?>" <?php selected( $key, $value ); ?>><?php echo esc_html( $label ); ?></option>
                        <?php endforeach; ?>
                    </select>
                </td>
            </tr>
            <tr>
                <th scope="row">
                    <?php esc_html_e( 'Explicit Content', 'wp-fedistream' ); ?>
                </th>
                <td>
                    <label>
                        <input type="checkbox" name="fedistream_track_explicit" value="1" <?php checked( $explicit, 1 ); ?>>
                        <?php esc_html_e( 'This track contains explicit content', 'wp-fedistream' ); ?>
                    </label>
                </td>
            </tr>
            <tr>
                <th scope="row">
                    <label for="fedistream_track_preview_start"><?php esc_html_e( 'Preview Settings', 'wp-fedistream' ); ?></label>
                </th>
                <td>
                    <label>
                        <?php esc_html_e( 'Start at:', 'wp-fedistream' ); ?>
                        <input type="number" name="fedistream_track_preview_start" id="fedistream_track_preview_start" value="<?php echo esc_attr( $preview_start ?: 0 ); ?>" min="0" class="small-text">
                        <?php esc_html_e( 'seconds', 'wp-fedistream' ); ?>
                    </label>
                    <br>
                    <label>
                        <?php esc_html_e( 'Duration:', 'wp-fedistream' ); ?>
                        <input type="number" name="fedistream_track_preview_duration" id="fedistream_track_preview_duration" value="<?php echo esc_attr( $preview_duration ?: 30 ); ?>" min="10" max="60" class="small-text">
                        <?php esc_html_e( 'seconds', 'wp-fedistream' ); ?>
                    </label>
                    <p class="description"><?php esc_html_e( 'Preview clip for non-authenticated users or before purchase.', 'wp-fedistream' ); ?></p>
                </td>
            </tr>
        </table>
        <?php
    }

    /**
     * Render album selection meta box.
     *
     * @param \WP_Post $post Post object.
     * @return void
     */
    public function render_album_meta_box( \WP_Post $post ): void {
        $selected_album = get_post_meta( $post->ID, self::META_PREFIX . 'album', true );

        $albums = get_posts(
            array(
                'post_type'      => 'fedistream_album',
                'posts_per_page' => -1,
                'post_status'    => array( 'publish', 'draft' ),
                'orderby'        => 'title',
                'order'          => 'ASC',
            )
        );
        ?>
        <p>
            <select name="fedistream_track_album" id="fedistream_track_album" class="widefat">
                <option value=""><?php esc_html_e( '— No Album (Single) —', 'wp-fedistream' ); ?></option>
                <?php foreach ( $albums as $album ) : ?>
                    <?php
                    $artist_id   = get_post_meta( $album->ID, '_fedistream_album_artist', true );
                    $artist_name = $artist_id ? get_the_title( $artist_id ) : '';
                    ?>
                    <option value="<?php echo esc_attr( $album->ID ); ?>" <?php selected( $selected_album, $album->ID ); ?>>
                        <?php echo esc_html( $album->post_title ); ?>
                        <?php if ( $artist_name ) : ?>
                            (<?php echo esc_html( $artist_name ); ?>)
                        <?php endif; ?>
                    </option>
                <?php endforeach; ?>
            </select>
        </p>
        <?php
    }

    /**
     * Render artists meta box.
     *
     * @param \WP_Post $post Post object.
     * @return void
     */
    public function render_artists_meta_box( \WP_Post $post ): void {
        $selected_artists = get_post_meta( $post->ID, self::META_PREFIX . 'artists', true );
        if ( ! is_array( $selected_artists ) ) {
            $selected_artists = array();
        }

        $artists = get_posts(
            array(
                'post_type'      => 'fedistream_artist',
                'posts_per_page' => -1,
                'post_status'    => 'publish',
                'orderby'        => 'title',
                'order'          => 'ASC',
            )
        );
        ?>
        <p class="description"><?php esc_html_e( 'Select all artists featured on this track.', 'wp-fedistream' ); ?></p>
        <div style="max-height: 200px; overflow-y: auto; border: 1px solid #ddd; padding: 5px;">
            <?php foreach ( $artists as $artist ) : ?>
                <label style="display: block; padding: 2px 0;">
                    <input type="checkbox" name="fedistream_track_artists[]" value="<?php echo esc_attr( $artist->ID ); ?>" <?php checked( in_array( $artist->ID, $selected_artists, true ) ); ?>>
                    <?php echo esc_html( $artist->post_title ); ?>
                </label>
            <?php endforeach; ?>
        </div>
        <?php if ( empty( $artists ) ) : ?>
            <p>
                <?php
                printf(
                    /* translators: %s: URL to add new artist */
                    esc_html__( 'No artists found. %s', 'wp-fedistream' ),
                    '<a href="' . esc_url( admin_url( 'post-new.php?post_type=fedistream_artist' ) ) . '">' . esc_html__( 'Add an artist first.', 'wp-fedistream' ) . '</a>'
                );
                ?>
            </p>
        <?php endif; ?>
        <?php
    }

    /**
     * Render track codes meta box.
     *
     * @param \WP_Post $post Post object.
     * @return void
     */
    public function render_codes_meta_box( \WP_Post $post ): void {
        $isrc = get_post_meta( $post->ID, self::META_PREFIX . 'isrc', true );
        ?>
        <p>
            <label for="fedistream_track_isrc"><?php esc_html_e( 'ISRC', 'wp-fedistream' ); ?></label>
            <input type="text" name="fedistream_track_isrc" id="fedistream_track_isrc" value="<?php echo esc_attr( $isrc ); ?>" class="widefat" pattern="[A-Z]{2}[A-Z0-9]{3}[0-9]{7}" title="<?php esc_attr_e( 'ISRC format: CC-XXX-YY-NNNNN', 'wp-fedistream' ); ?>">
            <span class="description"><?php esc_html_e( 'International Standard Recording Code', 'wp-fedistream' ); ?></span>
        </p>
        <?php
    }

    /**
     * Save post meta.
     *
     * @param int      $post_id Post ID.
     * @param \WP_Post $post    Post object.
     * @return void
     */
    public function save_meta( int $post_id, \WP_Post $post ): void {
        if ( ! $this->can_save( $post_id, 'fedistream_track_save', 'fedistream_track_nonce' ) ) {
            return;
        }

        // Save audio fields.
        $this->save_int_meta( $post_id, self::META_PREFIX . 'audio_file', 'fedistream_track_audio_file' );
        $this->save_int_meta( $post_id, self::META_PREFIX . 'duration', 'fedistream_track_duration' );

        // Save audio format.
        if ( isset( $_POST['fedistream_track_audio_format'] ) ) {
            $allowed_formats = array( '', 'mp3', 'wav', 'flac', 'ogg' );
            $format          = sanitize_text_field( wp_unslash( $_POST['fedistream_track_audio_format'] ) );
            if ( in_array( $format, $allowed_formats, true ) ) {
                update_post_meta( $post_id, self::META_PREFIX . 'audio_format', $format );
            }
        }

        // Save track info.
        $this->save_int_meta( $post_id, self::META_PREFIX . 'number', 'fedistream_track_number' );
        $this->save_int_meta( $post_id, self::META_PREFIX . 'disc_number', 'fedistream_track_disc_number' );
        $this->save_int_meta( $post_id, self::META_PREFIX . 'bpm', 'fedistream_track_bpm' );
        $this->save_text_meta( $post_id, self::META_PREFIX . 'key', 'fedistream_track_key' );
        $this->save_bool_meta( $post_id, self::META_PREFIX . 'explicit', 'fedistream_track_explicit' );
        $this->save_int_meta( $post_id, self::META_PREFIX . 'preview_start', 'fedistream_track_preview_start' );
        $this->save_int_meta( $post_id, self::META_PREFIX . 'preview_duration', 'fedistream_track_preview_duration' );

        // Save album.
        $this->save_int_meta( $post_id, self::META_PREFIX . 'album', 'fedistream_track_album' );

        // Save artists.
        if ( isset( $_POST['fedistream_track_artists'] ) && is_array( $_POST['fedistream_track_artists'] ) ) {
            $artists = array_map( 'absint', $_POST['fedistream_track_artists'] );
            update_post_meta( $post_id, self::META_PREFIX . 'artists', $artists );
        } else {
            delete_post_meta( $post_id, self::META_PREFIX . 'artists' );
        }

        // Save ISRC.
        $this->save_text_meta( $post_id, self::META_PREFIX . 'isrc', 'fedistream_track_isrc' );
    }

    /**
     * Update album stats when track is saved.
     *
     * @param int      $post_id Post ID.
     * @param \WP_Post $post    Post object.
     * @return void
     */
    public function update_album_on_save( int $post_id, \WP_Post $post ): void {
        $album_id = get_post_meta( $post_id, self::META_PREFIX . 'album', true );
        if ( $album_id ) {
            Album::update_album_stats( (int) $album_id );
        }
    }

    /**
     * Get track by ID with meta.
     *
     * @param int $post_id Post ID.
     * @return array|null Track data or null.
     */
    public static function get_track( int $post_id ): ?array {
        $post = get_post( $post_id );
        if ( ! $post || 'fedistream_track' !== $post->post_type ) {
            return null;
        }

        $album_id   = get_post_meta( $post_id, self::META_PREFIX . 'album', true );
        $audio_file = get_post_meta( $post_id, self::META_PREFIX . 'audio_file', true );
        $artists    = get_post_meta( $post_id, self::META_PREFIX . 'artists', true ) ?: array();

        // Get artist names.
        $artist_names = array();
        foreach ( $artists as $artist_id ) {
            $artist_names[] = get_the_title( $artist_id );
        }

        return array(
            'id'               => $post->ID,
            'title'            => $post->post_title,
            'slug'             => $post->post_name,
            'lyrics'           => $post->post_content,
            'album_id'         => $album_id ? (int) $album_id : null,
            'album_title'      => $album_id ? get_the_title( $album_id ) : null,
            'artists'          => $artists,
            'artist_names'     => $artist_names,
            'track_number'     => (int) get_post_meta( $post_id, self::META_PREFIX . 'number', true ),
            'disc_number'      => (int) get_post_meta( $post_id, self::META_PREFIX . 'disc_number', true ) ?: 1,
            'duration'         => (int) get_post_meta( $post_id, self::META_PREFIX . 'duration', true ),
            'audio_file'       => $audio_file ? (int) $audio_file : null,
            'audio_url'        => $audio_file ? wp_get_attachment_url( $audio_file ) : null,
            'audio_format'     => get_post_meta( $post_id, self::META_PREFIX . 'audio_format', true ),
            'bpm'              => (int) get_post_meta( $post_id, self::META_PREFIX . 'bpm', true ),
            'key'              => get_post_meta( $post_id, self::META_PREFIX . 'key', true ),
            'explicit'         => (bool) get_post_meta( $post_id, self::META_PREFIX . 'explicit', true ),
            'isrc'             => get_post_meta( $post_id, self::META_PREFIX . 'isrc', true ),
            'preview_start'    => (int) get_post_meta( $post_id, self::META_PREFIX . 'preview_start', true ),
            'preview_duration' => (int) get_post_meta( $post_id, self::META_PREFIX . 'preview_duration', true ) ?: 30,
            'artwork'          => get_the_post_thumbnail_url( $post_id, 'large' ),
            'url'              => get_permalink( $post_id ),
        );
    }
}