<?php
/**
 * Admin Interface class
 *
 * @package BD_Bookshelf
 */

if (!defined('ABSPATH')) {
    exit;
}

class BDM_Admin {

    /**
     * Constructor
     */
    public function __construct() {
        add_action('admin_menu', [$this, 'add_admin_menu']);
        add_action('admin_enqueue_scripts', [$this, 'enqueue_admin_scripts']);
        
        // AJAX handlers
        add_action('wp_ajax_bd_bookshelf_save_book', [$this, 'ajax_save_book']);
        add_action('wp_ajax_bd_bookshelf_delete_book', [$this, 'ajax_delete_book']);
        add_action('wp_ajax_bd_bookshelf_get_author', [$this, 'ajax_get_author']);
        add_action('wp_ajax_bd_bookshelf_save_author', [$this, 'ajax_save_author']);
        add_action('wp_ajax_bd_bookshelf_delete_author', [$this, 'ajax_delete_author']);
        add_action('wp_ajax_bd_bookshelf_get_series', [$this, 'ajax_get_series']);
        add_action('wp_ajax_bd_bookshelf_save_series', [$this, 'ajax_save_series']);
        add_action('wp_ajax_bd_bookshelf_delete_series', [$this, 'ajax_delete_series']);
        add_action('wp_ajax_bd_bookshelf_get_shortcode', [$this, 'ajax_get_shortcode']);
        add_action('wp_ajax_bd_bookshelf_save_shortcode', [$this, 'ajax_save_shortcode']);
        add_action('wp_ajax_bd_bookshelf_delete_shortcode', [$this, 'ajax_delete_shortcode']);
        add_action('wp_ajax_bd_bookshelf_save_sites', [$this, 'ajax_save_sites']);
        add_action('wp_ajax_bd_bookshelf_save_settings', [$this, 'ajax_save_settings']);
        add_action('wp_ajax_bd_bookshelf_import_csv', [$this, 'ajax_import_csv']);
        add_action('wp_ajax_bd_bookshelf_import_posts', [$this, 'ajax_import_posts']);
        add_action('wp_ajax_bd_bookshelf_sync_ratings', [$this, 'ajax_sync_ratings']);
    }

    /**
     * Add admin menu
     */
    public function add_admin_menu() {
        add_menu_page(
            __('Books', 'bd-bookshelf'),
            __('Books', 'bd-bookshelf'),
            'manage_options',
            'bd-bookshelf',
            [$this, 'render_books_page'],
            'dashicons-book',
            30
        );
        
        add_submenu_page('bd-bookshelf', __('All Books', 'bd-bookshelf'), __('All Books', 'bd-bookshelf'), 'manage_options', 'bd-bookshelf', [$this, 'render_books_page']);
        add_submenu_page('bd-bookshelf', __('Add New Book', 'bd-bookshelf'), __('Add New Book', 'bd-bookshelf'), 'manage_options', 'bd-bookshelf-add', [$this, 'render_book_form']);
        add_submenu_page('bd-bookshelf', __('Authors', 'bd-bookshelf'), __('Authors', 'bd-bookshelf'), 'manage_options', 'bd-bookshelf-authors', [$this, 'render_authors_page']);
        add_submenu_page('bd-bookshelf', __('Series', 'bd-bookshelf'), __('Series', 'bd-bookshelf'), 'manage_options', 'bd-bookshelf-series', [$this, 'render_series_page']);
        add_submenu_page('bd-bookshelf', __('Retail Sites', 'bd-bookshelf'), __('Retail Sites', 'bd-bookshelf'), 'manage_options', 'bd-bookshelf-sites', [$this, 'render_sites_page']);
        add_submenu_page('bd-bookshelf', __('Shortcodes', 'bd-bookshelf'), __('Shortcodes', 'bd-bookshelf'), 'manage_options', 'bd-bookshelf-shortcodes', [$this, 'render_shortcodes_page']);
        add_submenu_page('bd-bookshelf', __('Rating Sync', 'bd-bookshelf'), __('Rating Sync', 'bd-bookshelf'), 'manage_options', 'bd-bookshelf-sync', [$this, 'render_sync_page']);
        add_submenu_page('bd-bookshelf', __('Settings', 'bd-bookshelf'), __('Settings', 'bd-bookshelf'), 'manage_options', 'bd-bookshelf-settings', [$this, 'render_settings_page']);
        add_submenu_page('bd-bookshelf', __('Import', 'bd-bookshelf'), __('Import', 'bd-bookshelf'), 'manage_options', 'bd-bookshelf-import', [$this, 'render_import_page']);
    }

    /**
     * Enqueue admin scripts
     */
    public function enqueue_admin_scripts($hook) {
        if (strpos($hook, 'bd-bookshelf') === false) {
            return;
        }

        wp_enqueue_media();
        wp_enqueue_style('bd-bookshelf-admin', BD_BOOKSHELF_URL . 'admin/css/bd-bookshelf-admin.css', [], BD_BOOKSHELF_VERSION);
        wp_enqueue_script('bd-bookshelf-admin', BD_BOOKSHELF_URL . 'admin/js/bd-bookshelf-admin.js', ['jquery'], BD_BOOKSHELF_VERSION, true);
        
        wp_localize_script('bd-bookshelf-admin', 'bdBookshelfAdmin', [
            'ajaxurl' => admin_url('admin-ajax.php'),
            'nonce' => wp_create_nonce('bd_bookshelf_admin_nonce'),
            'mediaTitle' => __('Select Cover Image', 'bd-bookshelf'),
            'mediaButton' => __('Use This Image', 'bd-bookshelf'),
        ]);
    }

    /**
     * Render Books list page
     */
    public function render_books_page() {
        if (!current_user_can('manage_options')) {
            wp_die(__('You do not have sufficient permissions to access this page.', 'bd-bookshelf'));
        }

        $books = BDM_Book_Manager::get_books(['number' => 50]);
        ?>
        <div class="wrap">
            <h1 class="wp-heading-inline"><?php esc_html_e('Books', 'bd-bookshelf'); ?></h1>
            <a href="<?php echo admin_url('admin.php?page=bd-bookshelf-add'); ?>" class="page-title-action"><?php esc_html_e('Add New Book', 'bd-bookshelf'); ?></a>
            <hr class="wp-header-end">
            
            <table class="wp-list-table widefat fixed striped">
                <thead>
                    <tr>
                        <th style="width:30%"><?php esc_html_e('Title', 'bd-bookshelf'); ?></th>
                        <th style="width:15%"><?php esc_html_e('ISBNs', 'bd-bookshelf'); ?></th>
                        <th style="width:15%"><?php esc_html_e('Ratings', 'bd-bookshelf'); ?></th>
                        <th style="width:15%"><?php esc_html_e('Last Sync', 'bd-bookshelf'); ?></th>
                        <th style="width:15%"><?php esc_html_e('Actions', 'bd-bookshelf'); ?></th>
                    </tr>
                </thead>
                <tbody>
                    <?php if (empty($books)) : ?>
                        <tr><td colspan="5"><?php esc_html_e('No books found. Click "Add New Book" to get started.', 'bd-bookshelf'); ?></td></tr>
                    <?php else : ?>
                        <?php foreach ($books as $book) : ?>
                            <tr>
                                <td>
                                    <a href="<?php echo admin_url('admin.php?page=bd-bookshelf-add&book_id=' . $book->id); ?>">
                                        <strong><?php echo esc_html($book->title); ?></strong>
                                    </a>
                                </td>
                                <td>
                                    <?php
                                    $isbns = [];
                                    if (!empty($book->isbn_ebook)) $isbns[] = 'eBook';
                                    if (!empty($book->isbn_paperback)) $isbns[] = 'PB';
                                    if (!empty($book->isbn_hardcover)) $isbns[] = 'HC';
                                    if (!empty($book->isbn_audio)) $isbns[] = 'Audio';
                                    echo esc_html(implode(', ', $isbns));
                                    ?>
                                </td>
                                <td>
                                    Amazon: <?php echo number_format($book->rating_amazon, 1); ?><br>
                                    Goodreads: <?php echo number_format($book->rating_goodreads, 1); ?>
                                </td>
                                <td><?php echo $book->last_sync ? date('M j, Y g:i a', strtotime($book->last_sync)) : '-'; ?></td>
                                <td>
                                    <a href="<?php echo admin_url('admin.php?page=bd-bookshelf-add&book_id=' . $book->id); ?>"><?php esc_html_e('Edit', 'bd-bookshelf'); ?></a> |
                                    <a href="#" class="bd-bookshelf-delete" data-id="<?php echo $book->id; ?>" style="color:#a00"><?php esc_html_e('Delete', 'bd-bookshelf'); ?></a>
                                </td>
                            </tr>
                        <?php endforeach; ?>
                    <?php endif; ?>
                </tbody>
            </table>
        </div>
        <?php
    }

    /**
     * Render Book form
     */
    public function render_book_form() {
        if (!current_user_can('manage_options')) {
            wp_die(__('You do not have sufficient permissions to access this page.', 'bd-bookshelf'));
        }

        $book_id = isset($_GET['book_id']) ? absint($_GET['book_id']) : 0;
        $book = $book_id ? BDM_Book_Manager::get_book($book_id) : null;
        $series = BDM_Series::get_series(['number' => 100]);
        $authors = BDM_Authors::get_authors(['number' => 100]);
        
        // Get existing retail links grouped by format and site
        $existing_links = [];
        if ($book) {
            $raw_links = BDM_Book_Manager::get_book_retail_links($book_id);
            foreach ($raw_links as $link) {
                $existing_links[$link->format][$link->site_name] = $link->url;
            }
        }
        
        // Retail sites for URL inputs
        $retail_sites = BDM_Retail_Sites::get_sites(true);
        ?>
        <div class="wrap">
            <h1><?php echo $book ? esc_html__('Edit Book', 'bd-bookshelf') : esc_html__('Add New Book', 'bd-bookshelf'); ?></h1>
            
            <form id="bd-bookshelf-book-form">
                <?php wp_nonce_field('bd_bookshelf_save_book', 'nonce'); ?>
                <input type="hidden" name="book_id" value="<?php echo $book_id; ?>">
                
                <h2><?php esc_html_e('Book Details', 'bd-bookshelf'); ?></h2>
                <table class="form-table">
                    <tr>
                        <th><label for="title"><?php esc_html_e('Title', 'bd-bookshelf'); ?> <span class="required">*</span></label></th>
                        <td><input type="text" name="title" id="title" value="<?php echo $book ? esc_attr($book->title) : ''; ?>" class="regular-text" required></td>
                    </tr>
                    <tr>
                        <th><label for="description"><?php esc_html_e('Description', 'bd-bookshelf'); ?></label></th>
                        <td><textarea name="description" id="description" rows="5" class="large-text"><?php echo $book ? esc_textarea($book->description) : ''; ?></textarea></td>
                    </tr>
                    <tr>
                        <th><label><?php esc_html_e('Cover Image', 'bd-bookshelf'); ?></label></th>
                        <td>
                            <div class="bd-bookshelf-cover-upload">
                                <input type="hidden" name="cover_image" id="cover_image" value="<?php echo $book ? esc_url($book->cover_image) : ''; ?>">
                                <div id="cover-preview" style="margin-bottom:10px">
                                    <?php if ($book && !empty($book->cover_image)) : ?>
                                        <img src="<?php echo esc_url($book->cover_image); ?>" style="max-width:200px;height:auto">
                                    <?php endif; ?>
                                </div>
                                <button type="button" id="cover-upload-btn" class="button"><?php esc_html_e('Select or Upload Cover', 'bd-bookshelf'); ?></button>
                                <button type="button" id="cover-remove-btn" class="button" style="display:none;color:#a00"><?php esc_html_e('Remove', 'bd-bookshelf'); ?></button>
                            </div>
                        </td>
                    </tr>
                    <tr>
                        <th><label for="series_id"><?php esc_html_e('Series', 'bd-bookshelf'); ?></label></th>
                        <td>
                            <select name="series_id" id="series_id">
                                <option value="0"><?php esc_html_e('None', 'bd-bookshelf'); ?></option>
                                <?php foreach ($series as $s) : ?>
                                    <option value="<?php echo $s->id; ?>" <?php selected($book->series_id ?? 0, $s->id); ?>><?php echo esc_html($s->name); ?></option>
                                <?php endforeach; ?>
                            </select>
                            <a href="<?php echo admin_url('admin.php?page=bd-bookshelf-series'); ?>" target="_blank" class="button button-small"><?php esc_html_e('Manage Series', 'bd-bookshelf'); ?></a>
                        </td>
                    </tr>
                </table>

                <h2><?php esc_html_e('Authors', 'bd-bookshelf'); ?></h2>
                <p class="description"><?php esc_html_e('Select up to 3 authors for this book.', 'bd-bookshelf'); ?></p>
                <div id="bd-bookshelf-authors-container">
                    <?php
                    $book_authors = [];
                    if ($book && !empty($book->authors)) {
                        foreach ($book->authors as $ba) {
                            $book_authors[] = $ba->author_id;
                        }
                    }
                    for ($i = 0; $i < 3; $i++) :
                        $selected = $book_authors[$i] ?? 0;
                    ?>
                    <div class="bd-bookshelf-author-row">
                        <select name="authors[]" class="bd-bookshelf-author-select">
                            <option value="0"><?php esc_html_e('-- Select Author --', 'bd-bookshelf'); ?></option>
                            <?php foreach ($authors as $a) : ?>
                                <option value="<?php echo $a->id; ?>" <?php selected($selected, $a->id); ?>><?php echo esc_html($a->display_name); ?></option>
                            <?php endforeach; ?>
                        </select>
                    </div>
                    <?php endfor; ?>
                </div>
                <a href="<?php echo admin_url('admin.php?page=bd-bookshelf-authors'); ?>" target="_blank" class="button button-small"><?php esc_html_e('Manage Authors', 'bd-bookshelf'); ?></a>

                <h2><?php esc_html_e('ISBNs & ASINs', 'bd-bookshelf'); ?></h2>
                <table class="wp-list-table widefat fixed striped bd-bookshelf-isbn-grid">
                    <thead>
                        <tr>
                            <th style="width:120px"><?php esc_html_e('Format', 'bd-bookshelf'); ?></th>
                            <th><?php esc_html_e('ISBN', 'bd-bookshelf'); ?></th>
                            <th><?php esc_html_e('Amazon ASIN', 'bd-bookshelf'); ?></th>
                        </tr>
                    </thead>
                    <tbody>
                        <tr>
                            <td><strong><?php esc_html_e('eBook', 'bd-bookshelf'); ?></strong></td>
                            <td><input type="text" name="isbn_ebook" value="<?php echo $book ? esc_attr($book->isbn_ebook) : ''; ?>" class="regular-text"></td>
                            <td><input type="text" name="asin_ebook" value="<?php echo $book ? esc_attr($book->asin_ebook ?? '') : ''; ?>" class="regular-text"></td>
                        </tr>
                        <tr>
                            <td><strong><?php esc_html_e('Paperback', 'bd-bookshelf'); ?></strong></td>
                            <td><input type="text" name="isbn_paperback" value="<?php echo $book ? esc_attr($book->isbn_paperback) : ''; ?>" class="regular-text"></td>
                            <td><input type="text" name="asin_paperback" value="<?php echo $book ? esc_attr($book->asin_paperback ?? '') : ''; ?>" class="regular-text"></td>
                        </tr>
                        <tr>
                            <td><strong><?php esc_html_e('Hardcover', 'bd-bookshelf'); ?></strong></td>
                            <td><input type="text" name="isbn_hardcover" value="<?php echo $book ? esc_attr($book->isbn_hardcover) : ''; ?>" class="regular-text"></td>
                            <td><input type="text" name="asin_hardcover" value="<?php echo $book ? esc_attr($book->asin_hardcover ?? '') : ''; ?>" class="regular-text"></td>
                        </tr>
                        <tr>
                            <td><strong><?php esc_html_e('Audio', 'bd-bookshelf'); ?></strong></td>
                            <td><input type="text" name="isbn_audio" value="<?php echo $book ? esc_attr($book->isbn_audio) : ''; ?>" class="regular-text"></td>
                            <td><input type="text" name="asin_audio" value="<?php echo $book ? esc_attr($book->asin_audio ?? '') : ''; ?>" class="regular-text"></td>
                        </tr>
                    </tbody>
                </table>
                <input type="hidden" name="goodreads_id" value="<?php echo $book ? esc_attr($book->goodreads_id) : ''; ?>">

                <h2><?php esc_html_e('Retail Links', 'bd-bookshelf'); ?></h2>
                <p class="description"><?php esc_html_e('Paste the direct purchase URL for each format and retailer. Leave blank if not available.', 'bd-bookshelf'); ?></p>
                
                <?php
                $formats_config = [
                    'ebook' => [
                        'label' => 'eBook',
                        'sites' => ['Amazon', 'Apple Books', 'Google Play', 'Barnes & Noble', 'Kobo'],
                    ],
                    'paperback' => [
                        'label' => 'Paperback',
                        'sites' => ['Amazon', 'Barnes & Noble', 'Kobo'],
                    ],
                    'hardcover' => [
                        'label' => 'Hardcover',
                        'sites' => ['Amazon', 'Barnes & Noble', 'Kobo'],
                    ],
                    'audio' => [
                        'label' => 'Audio',
                        'sites' => ['Amazon', 'Apple Books', 'Barnes & Noble', 'Kobo'],
                    ],
                ];
                ?>
                
                <?php foreach ($formats_config as $format_key => $format_config) : ?>
                    <h3><?php echo esc_html($format_config['label']); ?></h3>
                    <table class="form-table">
                        <?php foreach ($format_config['sites'] as $site_name) : ?>
                            <tr>
                                <th><label><?php echo esc_html($site_name); ?></label></th>
                                <td>
                                    <input type="url" 
                                           name="retail_url[<?php echo esc_attr($format_key); ?>][<?php echo esc_attr($site_name); ?>]" 
                                           value="<?php echo esc_url($existing_links[$format_key][$site_name] ?? ''); ?>" 
                                           class="regular-text"
                                           placeholder="https://...">
                                </td>
                            </tr>
                        <?php endforeach; ?>
                    </table>
                <?php endforeach; ?>
                
                <p class="submit">
                    <button type="submit" class="button button-primary button-hero"><?php esc_html_e('Save Book', 'bd-bookshelf'); ?></button>
                </p>
            </form>
        </div>
        <?php
    }

    /**
     * Render Authors page
     */
    public function render_authors_page() {
        if (!current_user_can('manage_options')) {
            wp_die(__('You do not have sufficient permissions to access this page.', 'bd-bookshelf'));
        }

        $authors = BDM_Authors::get_authors(['number' => 100]);
        ?>
        <div class="wrap">
            <h1 class="wp-heading-inline"><?php esc_html_e('Authors', 'bd-bookshelf'); ?></h1>
            <button type="button" id="bd-bookshelf-add-author" class="page-title-action"><?php esc_html_e('Add New Author', 'bd-bookshelf'); ?></button>
            <hr class="wp-header-end">
            
            <table class="wp-list-table widefat fixed striped">
                <thead>
                    <tr>
                        <th style="width:20%"><?php esc_html_e('Name', 'bd-bookshelf'); ?></th>
                        <th style="width:20%"><?php esc_html_e('Email', 'bd-bookshelf'); ?></th>
                        <th style="width:15%"><?php esc_html_e('Website', 'bd-bookshelf'); ?></th>
                        <th style="width:15%"><?php esc_html_e('Goodreads ID', 'bd-bookshelf'); ?></th>
                        <th style="width:15%"><?php esc_html_e('Actions', 'bd-bookshelf'); ?></th>
                    </tr>
                </thead>
                <tbody>
                    <?php if (empty($authors)) : ?>
                        <tr><td colspan="5"><?php esc_html_e('No authors found.', 'bd-bookshelf'); ?></td></tr>
                    <?php else : ?>
                        <?php foreach ($authors as $author) : ?>
                            <tr>
                                <td><strong><?php echo esc_html($author->display_name); ?></strong></td>
                                <td><?php echo esc_html($author->email); ?></td>
                                <td><?php echo $author->website ? '<a href="' . esc_url($author->website) . '" target="_blank">' . esc_html($author->website) . '</a>' : '-'; ?></td>
                                <td><?php echo esc_html($author->goodreads_author_id); ?></td>
                                <td>
                                    <a href="#" class="bd-bookshelf-edit-author" data-id="<?php echo $author->id; ?>"><?php esc_html_e('Edit', 'bd-bookshelf'); ?></a> |
                                    <a href="#" class="bd-bookshelf-delete-author" data-id="<?php echo $author->id; ?>" style="color:#a00"><?php esc_html_e('Delete', 'bd-bookshelf'); ?></a>
                                </td>
                            </tr>
                        <?php endforeach; ?>
                    <?php endif; ?>
                </tbody>
            </table>
        </div>
        
        <!-- Author Modal -->
        <div id="bd-bookshelf-author-modal" class="bd-bookshelf-modal" style="display:none">
            <div class="bd-bookshelf-modal-content">
                <div class="bd-bookshelf-modal-header">
                    <h2 id="bd-bookshelf-author-modal-title"><?php esc_html_e('Add New Author', 'bd-bookshelf'); ?></h2>
                    <button type="button" class="bd-bookshelf-modal-close">&times;</button>
                </div>
                <form id="bd-bookshelf-author-form">
                    <?php wp_nonce_field('bd_bookshelf_admin_nonce', 'author_nonce'); ?>
                    <input type="hidden" name="author_id" id="author_id" value="0">
                    <table class="form-table">
                        <tr>
                            <th><label for="author_display_name"><?php esc_html_e('Display Name', 'bd-bookshelf'); ?> <span class="required">*</span></label></th>
                            <td><input type="text" name="display_name" id="author_display_name" class="regular-text" required></td>
                        </tr>
                        <tr>
                            <th><label for="author_email"><?php esc_html_e('Email', 'bd-bookshelf'); ?></label></th>
                            <td><input type="email" name="email" id="author_email" class="regular-text"></td>
                        </tr>
                        <tr>
                            <th><label for="author_website"><?php esc_html_e('Website', 'bd-bookshelf'); ?></label></th>
                            <td><input type="url" name="website" id="author_website" class="regular-text"></td>
                        </tr>
                        <tr>
                            <th><label for="author_bio"><?php esc_html_e('Bio', 'bd-bookshelf'); ?></label></th>
                            <td><textarea name="bio" id="author_bio" rows="4" class="large-text"></textarea></td>
                        </tr>
                        <tr>
                            <th><label for="author_goodreads_id"><?php esc_html_e('Goodreads Author ID', 'bd-bookshelf'); ?></label></th>
                            <td><input type="text" name="goodreads_author_id" id="author_goodreads_id" class="regular-text"></td>
                        </tr>
                        <tr>
                            <th><label><?php esc_html_e('Photo', 'bd-bookshelf'); ?></label></th>
                            <td>
                                <input type="hidden" name="photo_url" id="author_photo_url" value="">
                                <div id="author-photo-preview" style="margin-bottom:10px"></div>
                                <button type="button" id="author-photo-btn" class="button"><?php esc_html_e('Select Photo', 'bd-bookshelf'); ?></button>
                                <button type="button" id="author-photo-remove" class="button" style="display:none;color:#a00"><?php esc_html_e('Remove', 'bd-bookshelf'); ?></button>
                            </td>
                        </tr>
                    </table>
                    <p class="submit">
                        <button type="submit" class="button button-primary"><?php esc_html_e('Save Author', 'bd-bookshelf'); ?></button>
                    </p>
                </form>
            </div>
        </div>
        <?php
    }

    /**
     * Render Series page
     */
    public function render_series_page() {
        if (!current_user_can('manage_options')) {
            wp_die(__('You do not have sufficient permissions to access this page.', 'bd-bookshelf'));
        }

        $series = BDM_Series::get_series(['number' => 100]);
        ?>
        <div class="wrap">
            <h1 class="wp-heading-inline"><?php esc_html_e('Series', 'bd-bookshelf'); ?></h1>
            <button type="button" id="bd-bookshelf-add-series" class="page-title-action"><?php esc_html_e('Add New Series', 'bd-bookshelf'); ?></button>
            <hr class="wp-header-end">
            
            <table class="wp-list-table widefat fixed striped">
                <thead>
                    <tr>
                        <th style="width:30%"><?php esc_html_e('Name', 'bd-bookshelf'); ?></th>
                        <th style="width:50%"><?php esc_html_e('Description', 'bd-bookshelf'); ?></th>
                        <th style="width:20%"><?php esc_html_e('Actions', 'bd-bookshelf'); ?></th>
                    </tr>
                </thead>
                <tbody>
                    <?php if (empty($series)) : ?>
                        <tr><td colspan="3"><?php esc_html_e('No series found.', 'bd-bookshelf'); ?></td></tr>
                    <?php else : ?>
                        <?php foreach ($series as $s) : ?>
                            <tr>
                                <td><strong><?php echo esc_html($s->name); ?></strong></td>
                                <td><?php echo esc_html(wp_trim_words($s->description, 15)); ?></td>
                                <td>
                                    <a href="#" class="bd-bookshelf-edit-series" data-id="<?php echo $s->id; ?>"><?php esc_html_e('Edit', 'bd-bookshelf'); ?></a> |
                                    <a href="#" class="bd-bookshelf-delete-series" data-id="<?php echo $s->id; ?>" style="color:#a00"><?php esc_html_e('Delete', 'bd-bookshelf'); ?></a>
                                </td>
                            </tr>
                        <?php endforeach; ?>
                    <?php endif; ?>
                </tbody>
            </table>
        </div>
        
        <!-- Series Modal -->
        <div id="bd-bookshelf-series-modal" class="bd-bookshelf-modal" style="display:none">
            <div class="bd-bookshelf-modal-content">
                <div class="bd-bookshelf-modal-header">
                    <h2 id="bd-bookshelf-series-modal-title"><?php esc_html_e('Add New Series', 'bd-bookshelf'); ?></h2>
                    <button type="button" class="bd-bookshelf-modal-close">&times;</button>
                </div>
                <form id="bd-bookshelf-series-form">
                    <?php wp_nonce_field('bd_bookshelf_admin_nonce', 'series_nonce'); ?>
                    <input type="hidden" name="series_id" id="series_id_input" value="0">
                    <table class="form-table">
                        <tr>
                            <th><label for="series_name"><?php esc_html_e('Series Name', 'bd-bookshelf'); ?> <span class="required">*</span></label></th>
                            <td><input type="text" name="name" id="series_name" class="regular-text" required></td>
                        </tr>
                        <tr>
                            <th><label for="series_description"><?php esc_html_e('Description', 'bd-bookshelf'); ?></label></th>
                            <td><textarea name="description" id="series_description" rows="4" class="large-text"></textarea></td>
                        </tr>
                    </table>
                    <p class="submit">
                        <button type="submit" class="button button-primary"><?php esc_html_e('Save Series', 'bd-bookshelf'); ?></button>
                    </p>
                </form>
            </div>
        </div>
        <?php
    }

    /**
     * Render Sites page
     */
    public function render_sites_page() {
        if (!current_user_can('manage_options')) {
            wp_die(__('You do not have sufficient permissions to access this page.', 'bd-bookshelf'));
        }

        $sites = BDM_Retail_Sites::get_sites(false);
        ?>
        <div class="wrap">
            <h1><?php esc_html_e('Retail Sites & Affiliate Codes', 'bd-bookshelf'); ?></h1>
            <p class="description"><?php esc_html_e('Enter your affiliate codes for each retail site. These codes will be appended to book links.', 'bd-bookshelf'); ?></p>
            
            <form id="bd-bookshelf-sites-form">
                <?php wp_nonce_field('bd_bookshelf_admin_nonce', 'sites_nonce'); ?>
                
                <table class="wp-list-table widefat fixed striped">
                    <thead>
                        <tr>
                            <th style="width:25%"><?php esc_html_e('Site', 'bd-bookshelf'); ?></th>
                            <th style="width:35%"><?php esc_html_e('URL Pattern', 'bd-bookshelf'); ?></th>
                            <th style="width:15%"><?php esc_html_e('Affiliate Param', 'bd-bookshelf'); ?></th>
                            <th style="width:25%"><?php esc_html_e('Your Affiliate Code', 'bd-bookshelf'); ?></th>
                        </tr>
                    </thead>
                    <tbody>
                        <?php foreach ($sites as $site) : ?>
                            <tr>
                                <td><strong><?php echo esc_html($site->name); ?></strong></td>
                                <td><code style="font-size:11px"><?php echo esc_html($site->url_pattern); ?></code></td>
                                <td><?php echo esc_html($site->affiliate_param); ?></td>
                                <td>
                                    <input type="text" name="affiliate[<?php echo $site->id; ?>]" value="<?php echo esc_attr($site->affiliate_code); ?>" class="regular-text" placeholder="<?php esc_attr_e('Enter affiliate code', 'bd-bookshelf'); ?>">
                                </td>
                            </tr>
                        <?php endforeach; ?>
                    </tbody>
                </table>
                
                <p class="submit">
                    <button type="submit" class="button button-primary button-hero"><?php esc_html_e('Save Affiliate Codes', 'bd-bookshelf'); ?></button>
                </p>
            </form>
        </div>
        <?php
    }

    /**
     * Render Shortcodes page
     */
    public function render_shortcodes_page() {
        if (!current_user_can('manage_options')) {
            wp_die(__('You do not have sufficient permissions to access this page.', 'bd-bookshelf'));
        }

        global $wpdb;
        $table = BDM_Database::table('shortcodes');
        $shortcodes = $wpdb->get_results("SELECT * FROM {$table} ORDER BY created_at DESC");
        ?>
        <div class="wrap">
            <h1 class="wp-heading-inline"><?php esc_html_e('Custom Shortcodes', 'bd-bookshelf'); ?></h1>
            <button type="button" id="bd-bookshelf-add-shortcode" class="page-title-action"><?php esc_html_e('Add New Shortcode', 'bd-bookshelf'); ?></button>
            <hr class="wp-header-end">
            
            <p class="description"><?php esc_html_e('Create shortcodes that redirect to external URLs. Use [slug] in your posts to redirect visitors.', 'bd-bookshelf'); ?></p>
            
            <table class="wp-list-table widefat fixed striped">
                <thead>
                    <tr>
                        <th style="width:20%"><?php esc_html_e('Shortcode', 'bd-bookshelf'); ?></th>
                        <th style="width:30%"><?php esc_html_e('Target URL', 'bd-bookshelf'); ?></th>
                        <th style="width:15%"><?php esc_html_e('Redirect', 'bd-bookshelf'); ?></th>
                        <th style="width:15%"><?php esc_html_e('Clicks', 'bd-bookshelf'); ?></th>
                        <th style="width:20%"><?php esc_html_e('Actions', 'bd-bookshelf'); ?></th>
                    </tr>
                </thead>
                <tbody>
                    <?php if (empty($shortcodes)) : ?>
                        <tr><td colspan="5"><?php esc_html_e('No shortcodes found.', 'bd-bookshelf'); ?></td></tr>
                    <?php else : ?>
                        <?php foreach ($shortcodes as $sc) : ?>
                            <tr>
                                <td><code>[<?php echo esc_html($sc->slug); ?>]</code></td>
                                <td><a href="<?php echo esc_url($sc->target_url); ?>" target="_blank"><?php echo esc_html($sc->target_url); ?></a></td>
                                <td><?php echo esc_html($sc->redirect_type); ?></td>
                                <td><?php echo number_format($sc->click_count); ?></td>
                                <td>
                                    <a href="#" class="bd-bookshelf-edit-shortcode" data-id="<?php echo $sc->id; ?>"><?php esc_html_e('Edit', 'bd-bookshelf'); ?></a> |
                                    <a href="#" class="bd-bookshelf-delete-shortcode" data-id="<?php echo $sc->id; ?>" style="color:#a00"><?php esc_html_e('Delete', 'bd-bookshelf'); ?></a>
                                </td>
                            </tr>
                        <?php endforeach; ?>
                    <?php endif; ?>
                </tbody>
            </table>
        </div>
        
        <!-- Shortcode Modal -->
        <div id="bd-bookshelf-shortcode-modal" class="bd-bookshelf-modal" style="display:none">
            <div class="bd-bookshelf-modal-content">
                <div class="bd-bookshelf-modal-header">
                    <h2 id="bd-bookshelf-shortcode-modal-title"><?php esc_html_e('Add New Shortcode', 'bd-bookshelf'); ?></h2>
                    <button type="button" class="bd-bookshelf-modal-close">&times;</button>
                </div>
                <form id="bd-bookshelf-shortcode-form">
                    <?php wp_nonce_field('bd_bookshelf_admin_nonce', 'shortcode_nonce'); ?>
                    <input type="hidden" name="shortcode_id" id="shortcode_id" value="0">
                    <table class="form-table">
                        <tr>
                            <th><label for="shortcode_slug"><?php esc_html_e('Shortcode Slug', 'bd-bookshelf'); ?> <span class="required">*</span></label></th>
                            <td>
                                <input type="text" name="slug" id="shortcode_slug" class="regular-text" required pattern="[a-z0-9\-]+">
                                <p class="description"><?php esc_html_e('Only lowercase letters, numbers, and hyphens. Use as: [your-slug]', 'bd-bookshelf'); ?></p>
                            </td>
                        </tr>
                        <tr>
                            <th><label for="shortcode_target"><?php esc_html_e('Target URL', 'bd-bookshelf'); ?> <span class="required">*</span></label></th>
                            <td><input type="url" name="target_url" id="shortcode_target" class="regular-text" required></td>
                        </tr>
                        <tr>
                            <th><label for="shortcode_redirect"><?php esc_html_e('Redirect Type', 'bd-bookshelf'); ?></label></th>
                            <td>
                                <select name="redirect_type" id="shortcode_redirect">
                                    <option value="301">301 - Permanent</option>
                                    <option value="302">302 - Temporary</option>
                                    <option value="307">307 - Temporary</option>
                                </select>
                            </td>
                        </tr>
                        <tr>
                            <th><label for="shortcode_description"><?php esc_html_e('Description', 'bd-bookshelf'); ?></label></th>
                            <td><input type="text" name="description" id="shortcode_description" class="regular-text"></td>
                        </tr>
                    </table>
                    <p class="submit">
                        <button type="submit" class="button button-primary"><?php esc_html_e('Save Shortcode', 'bd-bookshelf'); ?></button>
                    </p>
                </form>
            </div>
        </div>
        <?php
    }

    /**
     * Render Sync page
     */
    public function render_sync_page() {
        if (!current_user_can('manage_options')) {
            wp_die(__('You do not have sufficient permissions to access this page.', 'bd-bookshelf'));
        }

        $last_sync = BDM_Rating_Sync::get_last_sync_info();
        ?>
        <div class="wrap">
            <h1><?php esc_html_e('Rating Sync', 'bd-bookshelf'); ?></h1>
            
            <div class="bd-bookshelf-import-section">
                <h2><?php esc_html_e('Sync Status', 'bd-bookshelf'); ?></h2>
                
                <?php if (!empty($last_sync)) : ?>
                    <table class="form-table">
                        <tr>
                            <th><?php esc_html_e('Last Sync Time', 'bd-bookshelf'); ?></th>
                            <td><?php echo esc_html($last_sync['time']); ?></td>
                        </tr>
                        <tr>
                            <th><?php esc_html_e('Books Synced', 'bd-bookshelf'); ?></th>
                            <td><?php echo esc_html($last_sync['synced']); ?></td>
                        </tr>
                        <tr>
                            <th><?php esc_html_e('Books Failed', 'bd-bookshelf'); ?></th>
                            <td><?php echo esc_html($last_sync['failed']); ?></td>
                        </tr>
                        <tr>
                            <th><?php esc_html_e('Total Books', 'bd-bookshelf'); ?></th>
                            <td><?php echo esc_html($last_sync['total']); ?></td>
                        </tr>
                    </table>
                <?php else : ?>
                    <p><?php esc_html_e('No sync has been performed yet.', 'bd-bookshelf'); ?></p>
                <?php endif; ?>
                
                <p class="submit">
                    <button type="button" id="bd-bookshelf-manual-sync" class="button button-primary"><?php esc_html_e('Sync Now', 'bd-bookshelf'); ?></button>
                </p>
            </div>
        </div>
        <?php
    }

    /**
     * Render Settings page
     */
    public function render_settings_page() {
        if (!current_user_can('manage_options')) {
            wp_die(__('You do not have sufficient permissions to access this page.', 'bd-bookshelf'));
        }

        ?>
        <div class="wrap">
            <h1><?php esc_html_e('Settings', 'bd-bookshelf'); ?></h1>
            
            <form id="bd-bookshelf-settings-form">
                <?php wp_nonce_field('bd_bookshelf_save_settings', 'nonce'); ?>
                
                <h2><?php esc_html_e('GDPR Settings', 'bd-bookshelf'); ?></h2>
                <table class="form-table">
                    <tr>
                        <th><label for="gdpr_text"><?php esc_html_e('Consent Banner Text', 'bd-bookshelf'); ?></label></th>
                        <td>
                            <textarea name="gdpr_text" id="gdpr_text" rows="3" class="large-text"><?php echo esc_textarea(BDM_GDPR::get_consent_text()); ?></textarea>
                        </td>
                    </tr>
                </table>
                
                <p class="submit">
                    <button type="submit" class="button button-primary"><?php esc_html_e('Save Settings', 'bd-bookshelf'); ?></button>
                </p>
            </form>
        </div>
        <?php
    }

    /**
     * Render Import page
     */
    public function render_import_page() {
        if (!current_user_can('manage_options')) {
            wp_die(__('You do not have sufficient permissions to access this page.', 'bd-bookshelf'));
        }

        ?>
        <div class="wrap">
            <h1><?php esc_html_e('Import Books', 'bd-bookshelf'); ?></h1>
            
            <div class="bd-bookshelf-import-section">
                <h2><?php esc_html_e('Import from CSV', 'bd-bookshelf'); ?></h2>
                <p><?php esc_html_e('Import books from a CSV file. Required column: title. Optional columns: description, isbn_ebook, isbn_paperback, isbn_hardcover, isbn_audio, amazon_asin, goodreads_id.', 'bd-bookshelf'); ?></p>
                
                <form id="bd-bookshelf-import-csv-form" enctype="multipart/form-data">
                    <?php wp_nonce_field('bd_bookshelf_admin_nonce', 'import_nonce'); ?>
                    
                    <table class="form-table">
                        <tr>
                            <th><label for="csv_file"><?php esc_html_e('CSV File', 'bd-bookshelf'); ?></label></th>
                            <td>
                                <input type="file" name="csv_file" id="csv_file" accept=".csv" required>
                            </td>
                        </tr>
                    </table>
                    
                    <p class="submit">
                        <button type="submit" class="button button-primary"><?php esc_html_e('Import CSV', 'bd-bookshelf'); ?></button>
                    </p>
                </form>
                
                <div id="bd-bookshelf-import-results" style="display:none">
                    <h3><?php esc_html_e('Import Results', 'bd-bookshelf'); ?></h3>
                    <p id="bd-bookshelf-import-message"></p>
                </div>
            </div>
            
            <div class="bd-bookshelf-import-section">
                <h2><?php esc_html_e('Import from WordPress Posts', 'bd-bookshelf'); ?></h2>
                <p><?php esc_html_e('Import books from existing WordPress posts or custom post types.', 'bd-bookshelf'); ?></p>
                
                <form id="bd-bookshelf-import-posts-form">
                    <?php wp_nonce_field('bd_bookshelf_admin_nonce', 'import_posts_nonce'); ?>
                    
                    <table class="form-table">
                        <tr>
                            <th><label for="post_type"><?php esc_html_e('Post Type', 'bd-bookshelf'); ?></label></th>
                            <td>
                                <select name="post_type" id="post_type">
                                    <option value="post"><?php esc_html_e('Posts', 'bd-bookshelf'); ?></option>
                                    <option value="page"><?php esc_html_e('Pages', 'bd-bookshelf'); ?></option>
                                    <option value="book"><?php esc_html_e('Books (if available)', 'bd-bookshelf'); ?></option>
                                </select>
                            </td>
                        </tr>
                        <tr>
                            <th><label for="limit"><?php esc_html_e('Limit', 'bd-bookshelf'); ?></label></th>
                            <td>
                                <input type="number" name="limit" id="limit" value="100" min="1" max="1000">
                            </td>
                        </tr>
                    </table>
                    
                    <p class="submit">
                        <button type="submit" class="button button-primary"><?php esc_html_e('Import Posts', 'bd-bookshelf'); ?></button>
                    </p>
                </form>
            </div>
        </div>
        <?php
    }

    /**
     * AJAX handler for saving book
     */
    public function ajax_save_book() {
        check_ajax_referer('bd_bookshelf_save_book', 'nonce');
        
        if (!current_user_can('manage_options')) {
            wp_send_json_error(['message' => 'Insufficient permissions']);
        }
        
        $book_id = absint($_POST['book_id'] ?? 0);
        
        $data = [
            'title' => sanitize_text_field($_POST['title'] ?? ''),
            'description' => wp_kses_post($_POST['description'] ?? ''),
            'cover_image' => esc_url_raw($_POST['cover_image'] ?? ''),
            'isbn_ebook' => sanitize_text_field($_POST['isbn_ebook'] ?? ''),
            'isbn_paperback' => sanitize_text_field($_POST['isbn_paperback'] ?? ''),
            'isbn_hardcover' => sanitize_text_field($_POST['isbn_hardcover'] ?? ''),
            'isbn_audio' => sanitize_text_field($_POST['isbn_audio'] ?? ''),
            'asin_ebook' => sanitize_text_field($_POST['asin_ebook'] ?? ''),
            'asin_paperback' => sanitize_text_field($_POST['asin_paperback'] ?? ''),
            'asin_hardcover' => sanitize_text_field($_POST['asin_hardcover'] ?? ''),
            'asin_audio' => sanitize_text_field($_POST['asin_audio'] ?? ''),
            'amazon_asin' => sanitize_text_field($_POST['asin_ebook'] ?? ''),
            'goodreads_id' => sanitize_text_field($_POST['goodreads_id'] ?? ''),
            'series_id' => absint($_POST['series_id'] ?? 0),
            'author_ids' => array_map('absint', $_POST['authors'] ?? []),
        ];
        
        if ($book_id) {
            $result = BDM_Book_Manager::update_book($book_id, $data);
        } else {
            $data['slug'] = sanitize_title($data['title']);
            $book_id = BDM_Book_Manager::create_book($data);
            $result = $book_id !== false;
        }
        
        if ($result) {
            // Save retail URLs
            $retail_urls = $_POST['retail_url'] ?? [];
            $this->save_retail_urls($book_id, $retail_urls);
            
            wp_send_json_success(['message' => 'Book saved', 'id' => $book_id]);
        } else {
            wp_send_json_error(['message' => 'Failed to save book']);
        }
    }

    /**
     * Save retail URLs for a book
     */
    private function save_retail_urls($book_id, $retail_urls) {
        global $wpdb;
        
        $links_table = BDM_Database::table('retail_links');
        $sites_table = BDM_Database::table('retail_sites');
        
        // Delete existing non-custom links
        $wpdb->delete($links_table, ['book_id' => $book_id, 'is_custom' => 0], ['%d', '%d']);
        
        if (empty($retail_urls) || !is_array($retail_urls)) {
            return;
        }
        
        foreach ($retail_urls as $format => $sites) {
            if (!is_array($sites)) continue;
            
            foreach ($sites as $site_name => $url) {
                $url = esc_url_raw(trim($url));
                if (empty($url)) continue;
                
                // Find or create site
                $site = $wpdb->get_row($wpdb->prepare(
                    "SELECT id FROM {$sites_table} WHERE name = %s",
                    $site_name
                ));
                
                if (!$site) {
                    $wpdb->insert($sites_table, [
                        'name' => $site_name,
                        'url_pattern' => '',
                        'is_custom' => 1,
                        'is_active' => 1,
                    ]);
                    $site_id = $wpdb->insert_id;
                } else {
                    $site_id = $site->id;
                }
                
                $wpdb->insert($links_table, [
                    'book_id' => $book_id,
                    'site_id' => $site_id,
                    'format' => $format,
                    'url' => $url,
                    'is_custom' => 0,
                ]);
            }
        }
    }

    /**
     * AJAX handler for deleting book
     */
    public function ajax_delete_book() {
        check_ajax_referer('bd_bookshelf_admin_nonce', 'nonce');
        
        if (!current_user_can('manage_options')) {
            wp_send_json_error(['message' => 'Insufficient permissions']);
        }
        
        $book_id = absint($_POST['id'] ?? 0);
        if (!$book_id) {
            wp_send_json_error(['message' => 'Invalid book ID']);
        }
        
        $result = BDM_Book_Manager::delete_book($book_id);
        
        if ($result) {
            wp_send_json_success(['message' => 'Book deleted']);
        } else {
            wp_send_json_error(['message' => 'Failed to delete book']);
        }
    }

    /**
     * AJAX handler for getting author
     */
    public function ajax_get_author() {
        check_ajax_referer('bd_bookshelf_admin_nonce', 'nonce');
        
        if (!current_user_can('manage_options')) {
            wp_send_json_error(['message' => 'Insufficient permissions']);
        }
        
        $author_id = absint($_POST['id'] ?? 0);
        if (!$author_id) {
            wp_send_json_error(['message' => 'Invalid author ID']);
        }
        
        $author = BDM_Authors::get_author($author_id);
        if (!$author) {
            wp_send_json_error(['message' => 'Author not found']);
        }
        
        wp_send_json_success($author);
    }

    /**
     * AJAX handler for saving author
     */
    public function ajax_save_author() {
        check_ajax_referer('bd_bookshelf_admin_nonce', 'author_nonce');
        
        if (!current_user_can('manage_options')) {
            wp_send_json_error(['message' => 'Insufficient permissions']);
        }
        
        $author_id = absint($_POST['author_id'] ?? 0);
        
        $data = [
            'display_name' => sanitize_text_field($_POST['display_name'] ?? ''),
            'email' => sanitize_email($_POST['email'] ?? ''),
            'website' => esc_url_raw($_POST['website'] ?? ''),
            'bio' => wp_kses_post($_POST['bio'] ?? ''),
            'goodreads_author_id' => sanitize_text_field($_POST['goodreads_author_id'] ?? ''),
            'photo_url' => esc_url_raw($_POST['photo_url'] ?? ''),
        ];
        
        if ($author_id) {
            $result = BDM_Authors::update_author($author_id, $data);
        } else {
            $author_id = BDM_Authors::create_author($data);
            $result = $author_id !== false;
        }
        
        if ($result) {
            wp_send_json_success(['message' => 'Author saved', 'id' => $author_id]);
        } else {
            wp_send_json_error(['message' => 'Failed to save author']);
        }
    }

    /**
     * AJAX handler for deleting author
     */
    public function ajax_delete_author() {
        check_ajax_referer('bd_bookshelf_admin_nonce', 'nonce');
        
        if (!current_user_can('manage_options')) {
            wp_send_json_error(['message' => 'Insufficient permissions']);
        }
        
        $author_id = absint($_POST['id'] ?? 0);
        if (!$author_id) {
            wp_send_json_error(['message' => 'Invalid author ID']);
        }
        
        $result = BDM_Authors::delete_author($author_id);
        
        if ($result) {
            wp_send_json_success(['message' => 'Author deleted']);
        } else {
            wp_send_json_error(['message' => 'Failed to delete author']);
        }
    }

    /**
     * AJAX handler for getting series
     */
    public function ajax_get_series() {
        check_ajax_referer('bd_bookshelf_admin_nonce', 'nonce');
        
        if (!current_user_can('manage_options')) {
            wp_send_json_error(['message' => 'Insufficient permissions']);
        }
        
        $series_id = absint($_POST['id'] ?? 0);
        if (!$series_id) {
            wp_send_json_error(['message' => 'Invalid series ID']);
        }
        
        $series = BDM_Series::get_series_by_id($series_id);
        if (!$series) {
            wp_send_json_error(['message' => 'Series not found']);
        }
        
        wp_send_json_success($series);
    }

    /**
     * AJAX handler for saving series
     */
    public function ajax_save_series() {
        check_ajax_referer('bd_bookshelf_admin_nonce', 'series_nonce');
        
        if (!current_user_can('manage_options')) {
            wp_send_json_error(['message' => 'Insufficient permissions']);
        }
        
        $series_id = absint($_POST['series_id'] ?? 0);
        
        $data = [
            'name' => sanitize_text_field($_POST['name'] ?? ''),
            'description' => wp_kses_post($_POST['description'] ?? ''),
        ];
        
        if ($series_id) {
            $result = BDM_Series::update_series($series_id, $data);
        } else {
            $series_id = BDM_Series::create_series($data);
            $result = $series_id !== false;
        }
        
        if ($result) {
            wp_send_json_success(['message' => 'Series saved', 'id' => $series_id]);
        } else {
            wp_send_json_error(['message' => 'Failed to save series']);
        }
    }

    /**
     * AJAX handler for deleting series
     */
    public function ajax_delete_series() {
        check_ajax_referer('bd_bookshelf_admin_nonce', 'nonce');
        
        if (!current_user_can('manage_options')) {
            wp_send_json_error(['message' => 'Insufficient permissions']);
        }
        
        $series_id = absint($_POST['id'] ?? 0);
        if (!$series_id) {
            wp_send_json_error(['message' => 'Invalid series ID']);
        }
        
        $result = BDM_Series::delete_series($series_id);
        
        if ($result) {
            wp_send_json_success(['message' => 'Series deleted']);
        } else {
            wp_send_json_error(['message' => 'Failed to delete series']);
        }
    }

    /**
     * AJAX handler for getting shortcode
     */
    public function ajax_get_shortcode() {
        check_ajax_referer('bd_bookshelf_admin_nonce', 'nonce');
        
        if (!current_user_can('manage_options')) {
            wp_send_json_error(['message' => 'Insufficient permissions']);
        }
        
        $shortcode_id = absint($_POST['id'] ?? 0);
        if (!$shortcode_id) {
            wp_send_json_error(['message' => 'Invalid shortcode ID']);
        }
        
        global $wpdb;
        $table = BDM_Database::table('shortcodes');
        $shortcode = $wpdb->get_row(
            $wpdb->prepare(
                "SELECT * FROM {$table} WHERE id = %d",
                $shortcode_id
            )
        );
        
        if (!$shortcode) {
            wp_send_json_error(['message' => 'Shortcode not found']);
        }
        
        wp_send_json_success($shortcode);
    }

    /**
     * AJAX handler for saving shortcode
     */
    public function ajax_save_shortcode() {
        check_ajax_referer('bd_bookshelf_admin_nonce', 'shortcode_nonce');
        
        if (!current_user_can('manage_options')) {
            wp_send_json_error(['message' => 'Insufficient permissions']);
        }
        
        $shortcode_id = absint($_POST['shortcode_id'] ?? 0);
        
        $data = [
            'slug' => sanitize_title($_POST['slug'] ?? ''),
            'target_url' => esc_url_raw($_POST['target_url'] ?? ''),
            'redirect_type' => sanitize_text_field($_POST['redirect_type'] ?? '301'),
            'description' => sanitize_text_field($_POST['description'] ?? ''),
        ];
        
        if (empty($data['slug']) || empty($data['target_url'])) {
            wp_send_json_error(['message' => 'Slug and Target URL are required']);
        }
        
        if ($shortcode_id) {
            $result = BDM_Shortcodes::update_shortcode($shortcode_id, $data);
        } else {
            $shortcode_id = BDM_Shortcodes::create_shortcode($data['slug'], $data['target_url'], $data['redirect_type'], $data['description']);
            $result = $shortcode_id !== false;
        }
        
        if ($result) {
            wp_send_json_success(['message' => 'Shortcode saved', 'id' => $shortcode_id]);
        } else {
            wp_send_json_error(['message' => 'Failed to save shortcode']);
        }
    }

    /**
     * AJAX handler for deleting shortcode
     */
    public function ajax_delete_shortcode() {
        check_ajax_referer('bd_bookshelf_admin_nonce', 'nonce');
        
        if (!current_user_can('manage_options')) {
            wp_send_json_error(['message' => 'Insufficient permissions']);
        }
        
        $shortcode_id = absint($_POST['id'] ?? 0);
        if (!$shortcode_id) {
            wp_send_json_error(['message' => 'Invalid shortcode ID']);
        }
        
        $result = BDM_Shortcodes::delete_shortcode($shortcode_id);
        
        if ($result) {
            wp_send_json_success(['message' => 'Shortcode deleted']);
        } else {
            wp_send_json_error(['message' => 'Failed to delete shortcode']);
        }
    }

    /**
     * AJAX handler for saving sites/affiliate codes
     */
    public function ajax_save_sites() {
        check_ajax_referer('bd_bookshelf_admin_nonce', 'sites_nonce');
        
        if (!current_user_can('manage_options')) {
            wp_send_json_error(['message' => 'Insufficient permissions']);
        }
        
        if (!empty($_POST['affiliate'])) {
            global $wpdb;
            $table = BDM_Database::table('retail_sites');
            
            foreach ($_POST['affiliate'] as $site_id => $code) {
                $wpdb->update(
                    $table,
                    ['affiliate_code' => sanitize_text_field($code)],
                    ['id' => absint($site_id)],
                    ['%s'],
                    ['%d']
                );
            }
        }
        
        wp_send_json_success(['message' => 'Affiliate codes saved']);
    }

    /**
     * AJAX handler for saving settings
     */
    public function ajax_save_settings() {
        check_ajax_referer('bd_bookshelf_save_settings', 'nonce');
        
        if (!current_user_can('manage_options')) {
            wp_send_json_error(['message' => 'Insufficient permissions']);
        }
        
        BDM_GDPR::update_consent_text($_POST['gdpr_text'] ?? '');
        
        wp_send_json_success(['message' => 'Settings saved']);
    }

    /**
     * AJAX handler for CSV import
     */
    public function ajax_import_csv() {
        check_ajax_referer('bd_bookshelf_admin_nonce', 'import_nonce');
        
        if (!current_user_can('manage_options')) {
            wp_send_json_error(['message' => 'Insufficient permissions']);
        }
        
        if (empty($_FILES['csv_file']['tmp_name'])) {
            wp_send_json_error(['message' => 'No file uploaded']);
        }
        
        $file = $_FILES['csv_file']['tmp_name'];
        $handle = fopen($file, 'r');
        
        if (!$handle) {
            wp_send_json_error(['message' => 'Unable to open file']);
        }
        
        // Get header row
        $header = fgetcsv($handle);
        
        $imported = 0;
        $updated = 0;
        $skipped = 0;
        $errors = [];
        
        while (($row = fgetcsv($handle)) !== false) {
            $data = array_combine($header, $row);
            
            if (empty($data['title'])) {
                $errors[] = 'Row ' . ($imported + $skipped + 1) . ': Missing title';
                continue;
            }
            
            // Check if already imported - update instead of skip
            $existing = BDM_Book_Manager::get_book_by_title($data['title']);
            
            $book_data = [
                'title' => $data['title'],
                'slug' => sanitize_title($data['title']),
                'description' => $data['description'] ?? '',
                'isbn_ebook' => $data['isbn_ebook'] ?? '',
                'isbn_paperback' => $data['isbn_paperback'] ?? '',
                'isbn_hardcover' => $data['isbn_hardcover'] ?? '',
                'isbn_audio' => $data['isbn_audio'] ?? '',
                'amazon_asin' => $data['amazon_asin'] ?? '',
                'goodreads_id' => $data['goodreads_id'] ?? '',
            ];
            
            if ($existing) {
                // Update existing book - fill in empty fields
                $update_data = [];
                foreach ($book_data as $key => $value) {
                    if ($key === 'title' || $key === 'slug') continue;
                    if (!empty($value) && empty($existing->$key)) {
                        $update_data[$key] = $value;
                    }
                }
                if (!empty($update_data)) {
                    BDM_Book_Manager::update_book($existing->id, $update_data);
                    $updated++;
                } else {
                    $skipped++;
                }
            } else {
                // Create new book
                $book_id = BDM_Book_Manager::create_book($book_data);
                if ($book_id) {
                    $imported++;
                } else {
                    $errors[] = 'Row ' . ($imported + $skipped + 1) . ': Failed to create book';
                }
            }
        }
        
        fclose($handle);
        
        $message = sprintf('Imported %d new books, updated %d existing, skipped %d', $imported, $updated, $skipped);
        if (!empty($errors)) {
            $message .= '. ' . count($errors) . ' errors.';
        }
        
        wp_send_json_success([
            'message' => $message,
            'imported' => $imported,
            'updated' => $updated,
            'skipped' => $skipped,
            'errors' => $errors,
        ]);
    }

    /**
     * AJAX handler for posts import
     */
    public function ajax_import_posts() {
        check_ajax_referer('bd_bookshelf_admin_nonce', 'import_posts_nonce');
        
        if (!current_user_can('manage_options')) {
            wp_send_json_error(['message' => 'Insufficient permissions']);
        }
        
        $post_type = sanitize_text_field($_POST['post_type'] ?? 'post');
        $limit = absint($_POST['limit'] ?? 100);
        
        $posts = get_posts([
            'post_type' => $post_type,
            'post_status' => 'publish',
            'numberposts' => $limit,
        ]);
        
        $imported = 0;
        $skipped = 0;
        
        foreach ($posts as $post) {
            // Check if already imported
            $existing = BDM_Book_Manager::get_book_by_title($post->post_title);
            if ($existing) {
                $skipped++;
                continue;
            }
            
            // Import book
            $book_id = BDM_Book_Manager::create_book([
                'title' => $post->post_title,
                'description' => $post->post_content,
            ]);
            
            if ($book_id) {
                // Link to WordPress post
                update_post_meta($post->ID, '_bd_bookshelf_book_id', $book_id);
                $imported++;
            }
        }
        
        wp_send_json_success([
            'message' => sprintf('Imported %d books, skipped %d', $imported, $skipped),
            'imported' => $imported,
            'skipped' => $skipped,
        ]);
    }

    /**
     * AJAX handler for manual sync
     */
    public function ajax_sync_ratings() {
        check_ajax_referer('bd_bookshelf_admin_nonce', 'nonce');
        
        if (!current_user_can('manage_options')) {
            wp_send_json_error(['message' => 'Insufficient permissions']);
        }
        
        $result = BDM_Rating_Sync::manual_sync();
        
        wp_send_json_success([
            'message' => sprintf('Synced %d books, failed %d', $result['synced'], $result['failed']),
            'result' => $result,
        ]);
    }
}