Umbra-Bookshelf/umbra-bookshelf/includes/books/class-umbra-migration.php

<?php
// Copyright 2026 Umbra Tools (umbratools.com)
// SPDX-License-Identifier: GPL-2.0-or-later

/**
 * Migration Manager class
 *
 * @package Umbra_Bookshelf
 */

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

class Umbra_Migration {

    /**
     * Constructor
     *
     * The "Import" admin page itself is registered once by Umbra_Admin
     * (slug: umbra-bookshelf-import), which is the variant wired to
     * admin/js/umbra-bookshelf-admin.js. This class only supplies the
     * two-phase preview/run AJAX endpoints that page has no equivalent for.
     *
     * Note: the bd_bookshelf_import_csv action is intentionally NOT
     * registered here -- Umbra_Admin already owns that action. Registering
     * it twice silently overwrote one of the two handlers.
     */
    public function __construct() {
        // AJAX handlers
        add_action('wp_ajax_bd_bookshelf_preview_import', [$this, 'ajax_import_posts']);
        add_action('wp_ajax_bd_bookshelf_run_import', [$this, 'ajax_run_import_posts']);
    }

    /**
     * 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.', 'umbra-bookshelf'));
        }

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

    /**
     * AJAX handler for previewing post import
     */
    public function ajax_import_posts() {
        check_ajax_referer('bd_bookshelf_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,
        ]);
        
        $preview = [];
        foreach ($posts as $post) {
            $preview[] = [
                'id' => $post->ID,
                'title' => $post->post_title,
                'date' => $post->post_date,
                'content' => wp_trim_words($post->post_content, 20),
            ];
        }
        
        wp_send_json_success(['posts' => $preview, 'count' => count($preview)]);
    }

    /**
     * AJAX handler for running post import
     */
    public function ajax_run_import_posts() {
        check_ajax_referer('bd_bookshelf_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
            $existing = Umbra_Book_Manager::get_book_by_title($post->post_title);
            if ($existing) {
                $skipped++;
                continue;
            }
            
            // Import book
            $book_id = Umbra_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 CSV import
     */
    public function ajax_import_csv() {
        check_ajax_referer('bd_bookshelf_import_csv', '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;
        $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
            $existing = Umbra_Book_Manager::get_book_by_title($data['title']);
            if ($existing) {
                $skipped++;
                continue;
            }
            
            // Create book
            $book_id = Umbra_Book_Manager::create_book([
                '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 ($book_id) {
                $imported++;
            } else {
                $errors[] = 'Row ' . ($imported + $skipped + 1) . ': Failed to create book';
            }
        }
        
        fclose($handle);
        
        wp_send_json_success([
            'message' => sprintf('Imported %d books, skipped %d, %d errors', $imported, $skipped, count($errors)),
            'imported' => $imported,
            'skipped' => $skipped,
            'errors' => $errors,
        ]);
    }
}