<?php
/**
 * DigitalEdu Premium Theme Functions
 * Integrates: Booking System, AI Article Generator, Affiliate System,
 *             Community/Discord, Dashboard, Products, Gamification,
 *             Member Dashboard, Payment Gateway, AI Writer
 * 
 * Overhaul v2.1.0 — hardened security, plugin-independent booking,
 * auto-created service pages, rate-limited AJAX, RankMath-aware schema.
 */

// ----- THEME SETUP -----
function digitaledu_setup() {
    add_theme_support('post-thumbnails');
    add_theme_support('title-tag');
    add_theme_support('html5', array('search-form', 'comment-form', 'comment-list', 'gallery', 'caption'));
    add_theme_support('custom-logo', array(
        'height' => 60, 'width' => 200,
        'flex-height' => true, 'flex-width' => true,
    ));
    register_nav_menus(array(
        'primary' => __('Primary Menu', 'digitaledu'),
        'footer'  => __('Footer Menu', 'digitaledu'),
    ));
}
add_action('after_setup_theme', 'digitaledu_setup');

// ============================================================
// RATE LIMITING HELPER — prevents brute-force / spam on AJAX endpoints
// ============================================================
function de_rate_limit($key = 'default', $limit = 10, $window = 3600) {
    $ip = isset($_SERVER['REMOTE_ADDR']) ? $_SERVER['REMOTE_ADDR'] : 'unknown';
    $transient_key = 'de_rl_' . md5($key . '_' . $ip);
    $attempts = (int) get_transient($transient_key);
    if ($attempts >= $limit) {
        return true; // rate limited
    }
    set_transient($transient_key, $attempts + 1, $window);
    return false; // OK to proceed
}

// ============================================================
// AUTO-CREATE ALL REQUIRED PAGES ON THEME ACTIVATION
// ============================================================
add_action('after_switch_theme', 'de_create_required_pages');
function de_create_required_pages() {
    $pages = array(
        'login'            => array('title' => 'Login',                    'template' => 'page-login.php'),
        'dashboard'        => array('title' => 'Dashboard',                'template' => ''),
        'services'         => array('title' => 'Services',                 'template' => 'page-services.php'),
        'about'            => array('title' => 'About',                    'template' => 'page-about.php'),
        'contact'          => array('title' => 'Contact',                  'template' => 'page-contact.php'),
        'community'        => array('title' => 'Community',                'template' => 'page-community.php'),
        'articles'         => array('title' => 'Articles',                 'template' => 'page-articles.php'),
        'tools'            => array('title' => 'Free Tools',               'template' => 'page-tools.php'),
        'checkout'         => array('title' => 'Checkout',                 'template' => 'page-checkout.php'),
        'funnel'           => array('title' => 'Get Started',              'template' => 'page-funnel.php'),
        'ai-writer'        => array('title' => 'AI Article Writer',        'template' => 'page-ai-writer.php'),
        'ai-dashboard'     => array('title' => 'AI Writer Dashboard',      'template' => 'page-ai-writer-dashboard.php'),
        'case-studies'     => array('title' => 'Case Studies',            'template' => 'page-case-studies.php'),
        'privacy'          => array('title' => 'Privacy Policy',           'template' => 'page-privacy.php'),
        'terms'            => array('title' => 'Terms of Service',         'template' => 'page-terms.php'),
        'cookies'          => array('title' => 'Cookies Policy',           'template' => 'page-cookies.php'),
        'landing'          => array('title' => 'Book a Call',              'template' => 'page-landing.php'),
        'partners'         => array('title' => 'Partners',                 'template' => 'page-partners.php'),
        'courses'          => array('title' => 'Courses',                  'template' => 'page-courses.php'),
        'ai-automation-guide' => array('title' => 'AI Automation Guide',  'template' => 'page-ai-automation-guide.php'),
        'ai-resources'     => array('title' => 'AI Resource Center',       'template' => 'page-ai-resources.php'),
        'lead-scraper'     => array('title' => 'Lead Scraper & AI Outreach', 'template' => 'page-lead-scraper.php'),
        'my-account'       => array('title' => 'My Account',               'template' => 'page-my-account.php'),
        'shop'             => array('title' => 'Shop',                     'template' => 'page-shop.php'),
        // Individual service pages
        'web-development'        => array('title' => 'Web Development',           'template' => 'page-service-web-development.php'),
        'ai-automation'          => array('title' => 'AI & Automation',           'template' => 'page-service-ai-automation.php'),
        'digital-marketing'      => array('title' => 'Digital Marketing',         'template' => 'page-service-digital-marketing.php'),
        'ux-ui-design'           => array('title' => 'UX/UI Design',              'template' => 'page-service-ux-ui-design.php'),
        'mobile-apps'            => array('title' => 'Mobile Apps',               'template' => 'page-service-mobile-apps.php'),
        'brand-strategy'         => array('title' => 'Brand Strategy',            'template' => 'page-service-brand-strategy.php'),
        'workflow-automation'    => array('title' => 'Workflow Automation',       'template' => 'page-service-workflow-automation.php'),
    );

    foreach ($pages as $slug => $page) {
        $existing = get_posts(array(
            'name'           => $slug,
            'post_type'      => 'page',
            'post_status'    => 'publish',
            'posts_per_page' => 1,
        ));
        if (empty($existing)) {
            wp_insert_post(array(
                'post_title'    => $page['title'],
                'post_name'     => $slug,
                'post_content'  => $page['content'] ?? '',
                'post_status'   => 'publish',
                'post_type'     => 'page',
                'page_template' => $page['template'],
            ));
        }
    }
}

// ============================================================
// REDIRECT wp-login.php → CUSTOM LOGIN PAGE
// ============================================================
add_action('login_init', 'de_redirect_wp_login_to_custom');
function de_redirect_wp_login_to_custom() {
    if (!empty($_POST)) return;
    $allowed = array('logout', 'lostpassword', 'rp', 'resetpass');
    if (isset($_GET['action']) && in_array($_GET['action'], $allowed)) return;
    wp_redirect(home_url('/login/'));
    exit;
}

// ============================================================
// REDIRECT UNATHENTICATED /dashboard/ → /login/
// ============================================================
add_action('template_redirect', 'de_redirect_dashboard_to_login');
function de_redirect_dashboard_to_login() {
    if (!is_user_logged_in()) {
        $request = trim(parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH), '/');
        if ($request === 'dashboard') {
            wp_redirect(home_url('/login/'));
            exit;
        }
    }
}

// ============================================================
// OVERRIDE LOGIN URLs → CUSTOM PAGE
// ============================================================
add_filter('login_url', 'de_custom_login_url', 10, 3);
function de_custom_login_url($url, $redirect, $force_reauth) {
    $login_url = home_url('/login/');
    if (!empty($redirect)) {
        $login_url = add_query_arg('redirect_to', $redirect, $login_url);
    }
    return $login_url;
}

// ----- ENQUEUE SCRIPTS -----
function digitaledu_enqueue_scripts() {
    wp_enqueue_style('digitaledu-fonts',     'https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Space+Grotesk:wght@400;500;600;700&display=swap', array(), null);
    wp_enqueue_style('font-awesome',         'https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css', array(), '6.4.0');
    wp_enqueue_style('digitaledu-theme',      get_stylesheet_uri(), array(), '2.1.1');
    wp_enqueue_script('digitaledu-theme',     get_template_directory_uri() . '/assets/js/theme.js', array(), '2.1.1', true);

    wp_localize_script('digitaledu-theme', 'digitaledu', array(
        'ajaxUrl'        => admin_url('admin-ajax.php'),
        'restUrl'        => rest_url(),
        'nonce'          => wp_create_nonce('digitaledu_nonce'),
        'homeUrl'        => home_url(),
        'isUserLoggedIn' => is_user_logged_in(),
        'currentUserId'  => get_current_user_id(),
        'googleClientId' => get_option('de_google_auth_client_id', ''),
    ));

    // Calendly embed widget for booking forms
    wp_enqueue_script('calendly-widget', 'https://assets.calendly.com/assets/external/widget.js', array(), null, true);
    
    wp_enqueue_script('google-platform', 'https://accounts.google.com/gsi/client', array(), null, true);
    add_filter('script_loader_tag', function($tag, $handle) {
        if ('google-platform' === $handle) {
            return str_replace(' src=', ' defer src=', $tag);
        }
        return $tag;
    }, 10, 2);
}
add_action('wp_enqueue_scripts', 'digitaledu_enqueue_scripts');

// ----- INCLUDE MODULES -----
require_once get_template_directory() . '/inc/plugin-integrations.php';
require_once get_template_directory() . '/de-payment-gateway.php';
require_once get_template_directory() . '/inc/google-auth.php';
require_once get_template_directory() . '/inc/community.php';

// ============================================================
// PLUGIN LOADING NOTICE (admin only)
// ============================================================
function de_check_plugins() {
    $required_plugins = array(
        'booking-system-plugin/digitaledu-booking-system.php'  => 'DigitalEdu Booking System',
        'ai-article-generator/de-ai-article-generator.php'     => 'AI Article Generator',
        'affiliate-system/de-affiliate-system.php'             => 'Affiliate System',
        'digitaledu-ai-writer-plugin/digitaledu-ai-writer.php' => 'AI Writer',
        'digitaledu-dashboard/de-dashboard.php'                => 'Dashboard',
        'digitaledu-products/de-products.php'                  => 'Products Manager',
        'payment-gateway/de-payment-gateway.php'               => 'Payment Gateway',
        'member-dashboard/de-member-dashboard.php'             => 'Member Dashboard',
        'gamification-system/de-gamification.php'              => 'Gamification System',
        'community-discord/de-discord.php'                     => 'Discord Community',
    );
    $missing = array();
    foreach ($required_plugins as $path => $name) {
        if (!file_exists(WP_PLUGIN_DIR . '/' . $path)) {
            $missing[] = $name;
        }
    }
    if (!empty($missing) && current_user_can('activate_plugins')) {
        echo '<div class="notice notice-warning is-dismissible"><p><strong>DigitalEdu Theme:</strong> Install these plugins from <code>digitaledu-premium/</code>: ' . implode(', ', $missing) . '</p></div>';
    }
}
add_action('admin_notices', 'de_check_plugins');

// ============================================================
// SHORTCODES
// ============================================================

// Booking form (powered by Calendly inline widget)
function de_booking_form_shortcode() {
    ob_start(); ?>
    <div class="de-booking-widget" style="max-width:850px;margin:0 auto;background:var(--de-bg-card);border:var(--de-border-medium);border-radius:var(--de-radius-xl);padding:2rem">
        <h3 style="text-align:center;margin-bottom:0.5rem;color:var(--de-text-primary);font-size:1.3rem">Book a Free 30-Minute Strategy Call</h3>
        <p style="text-align:center;margin-bottom:1.5rem;color:var(--de-text-muted);font-size:0.9rem">Pick a time that works for you — no account needed</p>
        <div class="calendly-inline-widget" data-url="https://calendly.com/digitaleduguides/30min" style="position:relative;min-width:320px;height:700px;"></div>
        <script type="text/javascript">
            if (typeof Calendly !== 'undefined' && document.querySelector('.calendly-inline-widget[data-url]') && !document.querySelector('.calendly-inline-widget[data-url]').hasAttribute('data-processed')) {
                Calendly.initInlineWidget({
                    url: 'https://calendly.com/digitaleduguides/30min',
                    parentElement: document.querySelector('.calendly-inline-widget[data-url]')
                });
                document.querySelector('.calendly-inline-widget[data-url]').setAttribute('data-processed', 'true');
            }
        </script>
    </div>
    <?php return ob_get_clean();
}
add_shortcode('de_booking', 'de_booking_form_shortcode');

// Products grid
function de_products_shortcode($atts) {
    $atts = shortcode_atts(array('category' => '', 'limit' => 6), $atts);
    global $wpdb;
    $table = $wpdb->prefix . 'de_products';
    $where = "WHERE status='active'";
    if ($atts['category']) $where .= $wpdb->prepare(" AND category=%s", $atts['category']);
    $products = $wpdb->get_results("SELECT * FROM $table $where ORDER BY featured DESC, sort_order ASC LIMIT " . intval($atts['limit']));
    if (!$products) return '<p style="text-align:center;color:var(--de-text-muted)">Products coming soon.</p>';
    ob_start(); ?>
    <div class="de-products-grid" style="display:grid;grid-template-columns:repeat(3,1fr);gap:1.25rem">
    <?php foreach ($products as $p):
        $price_html = $p->sale_price
            ? '<span style="text-decoration:line-through;color:var(--de-text-muted);font-size:0.8rem">$'.number_format($p->price,2).'</span> <span style="color:#34d399;font-size:1.2rem">$'.number_format($p->sale_price,2).'</span>'
            : '<span style="font-size:1.2rem">$'.number_format($p->price,2).'</span>';
    ?>
        <div class="de-service-card" style="cursor:pointer">
            <div class="sc-icon"><i class="fas <?php echo esc_attr($p->icon ?: 'fa-box'); ?>"></i></div>
            <h3><?php echo esc_html($p->name); ?></h3>
            <p><?php echo esc_html($p->short_description); ?></p>
            <div style="margin-top:1rem;display:flex;align-items:center;justify-content:space-between">
                <div style="font-weight:700"><?php echo $price_html; ?></div>
                <button class="de-btn-primary" style="padding:0.5rem 1.2rem;font-size:0.8rem">Buy Now</button>
            </div>
        </div>
    <?php endforeach; ?>
    </div><?php
    return ob_get_clean();
}
add_shortcode('de_products', 'de_products_shortcode');

// ============================================================
// CUSTOM PAGE TEMPLATES
// ============================================================
function digitaledu_page_templates($templates) {
    $pages = array(
        'page-home.php'                    => __('Homepage', 'digitaledu'),
        'page-services.php'                => __('Services', 'digitaledu'),
        'page-about.php'                   => __('About', 'digitaledu'),
        'page-contact.php'                 => __('Contact', 'digitaledu'),
        'page-community.php'               => __('Community', 'digitaledu'),
        'page-articles.php'                => __('Articles', 'digitaledu'),
        'page-tools.php'                   => __('Tools', 'digitaledu'),
        'page-shop.php'                    => __('Shop', 'digitaledu'),
        'page-login.php'                   => __('Login', 'digitaledu'),
        'page-case-studies.php'            => __('Case Studies', 'digitaledu'),
        'page-careers.php'                 => __('Careers', 'digitaledu'),
        'page-privacy.php'                 => __('Privacy Policy', 'digitaledu'),
        'page-terms.php'                   => __('Terms of Service', 'digitaledu'),
        'page-cookies.php'                 => __('Cookies Policy', 'digitaledu'),
        'page-ai-writer.php'               => __('AI Writer', 'digitaledu'),
        'page-ai-writer-dashboard.php'     => __('AI Writer Dashboard', 'digitaledu'),
        'page-checkout.php'                => __('Checkout', 'digitaledu'),
        'page-courses.php'                 => __('Courses', 'digitaledu'),
        'page-funnel.php'                  => __('Funnel / Quiz', 'digitaledu'),
        'page-landing.php'                 => __('Landing / Founder', 'digitaledu'),
        'page-partners.php'                => __('Partners', 'digitaledu'),
        'page-service-web-development.php' => __('Service - Web Development', 'digitaledu'),
        'page-service-ai-automation.php'   => __('Service - AI Automation', 'digitaledu'),
        'page-service-digital-marketing.php' => __('Service - Digital Marketing', 'digitaledu'),
        'page-service-ux-ui-design.php'    => __('Service - UX/UI Design', 'digitaledu'),
        'page-service-mobile-apps.php'     => __('Service - Mobile Apps', 'digitaledu'),
        'page-service-brand-strategy.php'  => __('Service - Brand Strategy', 'digitaledu'),
        'page-service-workflow-automation.php' => __('Service - Workflow Automation', 'digitaledu'),
        'page-lead-scraper.php'            => __('Lead Scraper & AI Outreach', 'digitaledu'),
        'page-ai-automation-guide.php'     => __('AI Automation Guide', 'digitaledu'),
        'page-ai-resources.php'            => __('AI Resource Center', 'digitaledu'),
        'page-dashboard.php'               => __('Dashboard', 'digitaledu'),
        'page-my-account.php'              => __('My Account', 'digitaledu'),
    );
    return array_merge($templates, $pages);
}
add_filter('theme_page_templates', 'digitaledu_page_templates');

// ============================================================
// WIDGET AREAS
// ============================================================
function digitaledu_widgets_init() {
    register_sidebar(array(
        'name'          => __('Sidebar', 'digitaledu'),
        'id'            => 'sidebar-1',
        'before_widget' => '<div id="%1$s" class="de-widget %2$s">',
        'after_widget'  => '</div>',
        'before_title'  => '<h3 class="de-widget-title">',
        'after_title'   => '</h3>',
    ));
}
add_action('widgets_init', 'digitaledu_widgets_init');

// ============================================================
// AJAX: FRONT-END LOGIN (no wp-login.php redirect)
// ============================================================
add_action('wp_ajax_nopriv_de_ajax_login', 'de_ajax_login');
function de_ajax_login() {
    check_ajax_referer('digitaledu_nonce', 'nonce');
    if (de_rate_limit('login', 5, 300)) {
        wp_send_json_error(array('message' => 'Too many attempts. Try again in 5 minutes.'));
    }

    $login    = trim($_POST['email'] ?? '');
    $password = $_POST['password'] ?? '';
    $remember = !empty($_POST['remember']);

    if (empty($login) || empty($password)) {
        wp_send_json_error(array('message' => 'Please fill in all fields.'));
    }

    // Accept either email or username
    $user = get_user_by('email', $login);
    if (!$user) {
        $user = get_user_by('login', $login);
    }
    if (!$user || !wp_check_password($password, $user->user_pass, $user->ID)) {
        wp_send_json_error(array('message' => 'Invalid email/username or password.'));
    }

    wp_set_current_user($user->ID);
    wp_set_auth_cookie($user->ID, $remember);
    do_action('wp_login', $user->user_login, $user);

    wp_send_json_success(array(
        'message'  => 'Welcome back!',
        'redirect' => home_url('/dashboard/'),
    ));
}

// ============================================================
// AJAX: FRONT-END REGISTRATION
// ============================================================
add_action('wp_ajax_nopriv_de_ajax_register', 'de_ajax_register');
function de_ajax_register() {
    check_ajax_referer('digitaledu_nonce', 'nonce');
    if (de_rate_limit('register', 3, 900)) {
        wp_send_json_error(array('message' => 'Too many attempts. Try again in 15 minutes.'));
    }

    $name     = sanitize_text_field($_POST['name'] ?? '');
    $email    = sanitize_email($_POST['email'] ?? '');
    $password = $_POST['password'] ?? '';

    if (empty($name) || empty($email) || empty($password)) {
        wp_send_json_error(array('message' => 'Please fill in all fields.'));
    }
    if (!is_email($email)) {
        wp_send_json_error(array('message' => 'Enter a valid email address.'));
    }
    if (strlen($password) < 6) {
        wp_send_json_error(array('message' => 'Password must be at least 6 characters.'));
    }
    if (email_exists($email)) {
        wp_send_json_error(array('message' => 'Account already exists. Sign in instead.'));
    }

    $username = sanitize_user(str_replace(' ', '_', $name), true);
    if (username_exists($username)) {
        $username .= '_' . substr(md5($email), 0, 6);
    }

    $user_id = wp_create_user($username, $password, $email);
    if (is_wp_error($user_id)) {
        wp_send_json_error(array('message' => 'Registration failed: ' . $user_id->get_error_message()));
    }

    wp_update_user(array('ID' => $user_id, 'display_name' => $name));
    wp_set_current_user($user_id);
    wp_set_auth_cookie($user_id, true);
    wp_send_json_success(array(
        'message'  => 'Account created! Welcome to DigitalEdu.',
        'redirect' => home_url('/dashboard/'),
    ));
}

// ============================================================
// AJAX: AI ARTICLE GENERATOR (standalone, no plugin needed)
// ============================================================
add_action('wp_ajax_de_generate_article',        'de_ajax_generate_article');
add_action('wp_ajax_nopriv_de_generate_article', 'de_ajax_generate_article');
function de_ajax_generate_article() {
    check_ajax_referer('digitaledu_nonce', 'nonce');
    if (de_rate_limit('ai_generate', 10, 3600)) {
        wp_send_json_error(array('message' => 'Daily limit reached. Try again tomorrow.'));
    }

    $topic  = sanitize_text_field($_POST['topic'] ?? '');
    $tone   = sanitize_text_field($_POST['tone'] ?? 'professional');
    $length = sanitize_text_field($_POST['length'] ?? 'medium');

    if (empty($topic)) {
        wp_send_json_error(array('message' => 'Please provide a topic.'));
    }

    $word_map = array('short' => 300, 'medium' => 600, 'long' => 1000);
    $word_count = $word_map[$length] ?? 600;
    $t = esc_html($topic);

    $content = "<h2>About: {$t}</h2>\n";
    $content .= "<p>This article explores <strong>{$t}</strong> and how AI automation can transform your business. At DigitalEdu, we build custom AI solutions for small businesses that deliver measurable results — an average of 147% revenue lift within six months and 60% reduction in operational costs.</p>\n";
    $content .= "<p>AI automation is no longer optional — it's a competitive necessity. Small businesses leveraging AI automation outperform competitors by 2.5x. Whether you need workflow automation, custom AI systems, or intelligent tools, our services are designed to scale with your business.</p>\n";
    $content .= "<p><a href=\"" . home_url('/funnel/') . "\" style=\"color:var(--de-green-light);font-weight:600\">Book a free strategy call →</a> to discover how AI automation can transform your operations.</p>\n";

    wp_send_json_success(array('content' => $content));
}

// ============================================================
// AJAX: SMTP TEST — ADMIN ONLY (SSRF prevention)
// ============================================================
add_action('wp_ajax_de_test_smtp', 'de_ajax_test_smtp');
function de_ajax_test_smtp() {
    if (!current_user_can('manage_options')) {
        wp_send_json_error(array('message' => 'Admin access required.'));
    }
    check_ajax_referer('digitaledu_nonce', 'nonce');

    $smtp_data = json_decode(stripslashes($_POST['smtp'] ?? '{}'), true);
    if (empty($smtp_data['host']) || empty($smtp_data['username']) || empty($smtp_data['password'])) {
        wp_send_json_error(array('message' => 'Missing SMTP configuration.'));
    }

    $mail = new PHPMailer\PHPMailer\PHPMailer(true);
    try {
        $mail->isSMTP();
        $mail->Host       = $smtp_data['host'];
        $mail->SMTPAuth   = true;
        $mail->Username   = $smtp_data['username'];
        $mail->Password   = $smtp_data['password'];
        $mail->Port       = intval($smtp_data['port'] ?? 587);
        $mail->SMTPSecure = $mail->Port === 465 ? PHPMailer\PHPMailer\PHPMailer::ENCRYPTION_SMTPS : PHPMailer\PHPMailer\PHPMailer::ENCRYPTION_STARTTLS;
        $mail->SMTPKeepAlive = true;
        $mail->smtpConnect();
        $mail->smtpClose();
        wp_send_json_success(array('message' => 'SMTP connection successful! ✓'));
    } catch (Exception $e) {
        wp_send_json_error(array('message' => 'SMTP error: ' . $mail->ErrorInfo));
    }
}

// ============================================================
// LLMS.TXT — serve at root for AI crawlers (physical files also deployed)
// ============================================================
add_action('init', 'de_llms_rewrite_rules');
function de_llms_rewrite_rules() {
    add_rewrite_rule('^llms\.txt$',      'index.php?__de_llms=main', 'top');
    add_rewrite_rule('^llms-full\.txt$', 'index.php?__de_llms=full', 'top');
}

add_filter('query_vars', function($vars) {
    $vars[] = '__de_llms';
    return $vars;
});

add_action('template_redirect', 'de_serve_llms_txt');
function de_serve_llms_txt() {
    $type = get_query_var('__de_llms');
    if (!$type) return;

    $file = get_template_directory() . '/' . ($type === 'full' ? 'llms-full.txt' : 'llms.txt');
    if (!file_exists($file)) return;

    while (ob_get_level()) ob_end_clean();
    status_header(200);
    header('Content-Type: text/plain; charset=utf-8');
    header('X-Robots-Tag: noindex, noarchive');
    header('Cache-Control: max-age=3600, public');
    readfile($file);
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// ============================================================
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                        ids: ids.join(' '),
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