// 1. Fix category pagination rewrite rules
add_filter('rewrite_rules_array', function($rules) {
    $new_rules = array();

    // Get all categories
    $categories = get_categories(array('hide_empty' => false));

    foreach($categories as $category) {
        // Fix numeric category pagination
        if (is_numeric($category->slug)) {
            $new_rules['category/' . $category->term_id . '/page/([0-9]+)/?$'] =
                'index.php?cat=' . $category->term_id . '&paged=$matches[1]';
        }
        // Fix slug-based category pagination
        $new_rules['category/' . $category->slug . '/page/([0-9]+)/?$'] =
            'index.php?category_name=' . $category->slug . '&paged=$matches[1]';
    }

    return array_merge($new_rules, $rules);
}, 10, 1);

// 2. Add related posts to single posts
add_filter('the_content', function($content) {
    if (!is_single() || !is_main_query()) return $content;

    global $post;
    $categories = wp_get_post_categories($post->ID);

    if (empty($categories)) return $content;

    $related_posts = get_posts(array(
        'category__in'   => $categories,
        'numberposts'    => 5,
        'post__not_in'   => array($post->ID),
        'orderby'        => 'rand'
    ));

    if ($related_posts) {
        $related_html = '<div class="related-posts" style="margin-top: 3em; padding: 2em; background: #f7f7f7; border-radius: 8px;">';
        $related_html .= '<h3 style="margin-bottom: 1em;">Articles Connexes</h3>';
        $related_html .= '<ul style="list-style: none; padding: 0;">';
        foreach($related_posts as $related) {
            $related_html .= sprintf(
                '<li style="margin-bottom: 0.5em;"><a href="%s" style="text-decoration: none; color: #0073aa;">→ %s</a></li>',
                get_permalink($related->ID),
                get_the_title($related->ID)
            );
        }
        $related_html .= '</ul></div>';
        $content .= $related_html;
    }

    return $content;
}, 10, 1);

// 3. Add pagination meta tags for SEO
add_action('wp_head', function() {
    global $wp_query, $paged;

    if (!is_paged()) return;

    $max_pages = $wp_query->max_num_pages;
    $current_page = max(1, get_query_var('paged', 1));

    // Add canonical for first page
    if (is_category() || is_archive()) {
        echo '<link rel="canonical" href="' . get_pagenum_link(1) . '" />' . "\n";
    }

    // Add prev/next links
    if ($current_page > 1) {
        echo '<link rel="prev" href="' . get_pagenum_link($current_page - 1) . '" />' . "\n";
    }
    if ($current_page < $max_pages) {
        echo '<link rel="next" href="' . get_pagenum_link($current_page + 1) . '" />' . "\n";
    }

    // Noindex deep pages (page 4+)
    if ($current_page > 3) {
        echo '<meta name="robots" content="noindex,follow" />' . "\n";
    }
}, 1);

// 4. Create category hub shortcode
add_shortcode('category_hub', function() {
    $categories = get_categories(array(
        'hide_empty' => false,
        'orderby' => 'count',
        'order' => 'DESC'
    ));

    if (empty($categories)) return '';

    $output = '<div class="category-hub" style="margin: 2em 0;">';
    $output .= '<h2>Toutes nos catégories</h2>';
    $output .= '<div style="display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1em;">';

    foreach($categories as $cat) {
        $count = $cat->count;
        $output .= sprintf(
            '<div style="padding: 1em; background: #f9f9f9; border-radius: 5px;">
                <h3 style="margin: 0 0 0.5em 0; font-size: 1.1em;">
                    <a href="%s" style="text-decoration: none; color: #333;">%s</a>
                </h3>
                <p style="margin: 0; color: #666; font-size: 0.9em;">%d articles</p>
            </div>',
            get_category_link($cat->term_id),
            $cat->name,
            $count
        );
    }

    $output .= '</div></div>';
    return $output;
});

// 5. Add breadcrumbs
add_action('generate_before_main_content', function() {
    if (is_home() || is_front_page()) return;

    echo '<nav class="breadcrumbs" style="padding: 1em 0; font-size: 0.9em; color: #666;">';
    echo '<div class="inside-article">';

    // Home link
    echo '<a href="' . home_url() . '">Accueil</a> » ';

    if (is_category()) {
        $category = get_category(get_query_var('cat'));
        echo '<span>' . $category->name . '</span>';
    } elseif (is_single()) {
        $categories = get_the_category();
        if ($categories) {
            echo '<a href="' . get_category_link($categories[0]->term_id) . '">' . $categories[0]->name . '</a> » ';
        }
        echo '<span>' . get_the_title() . '</span>';
    } elseif (is_page()) {
        echo '<span>' . get_the_title() . '</span>';
    } elseif (is_archive()) {
        echo '<span>Archives</span>';
    }

    echo '</div></nav>';
}, 5);

// 6. Archive pages widget for sidebar
add_action('widgets_init', function() {
    register_sidebar(array(
        'name' => 'Archive Sidebar',
        'id' => 'archive-sidebar',
        'before_widget' => '<div class="widget">',
        'after_widget' => '</div>',
        'before_title' => '<h3 class="widget-title">',
        'after_title' => '</h3>'
    ));
});

// 7. Ensure blog page exists
add_action('init', function() {
    $blog_page = get_page_by_path('blog');
    if (!$blog_page) {
        $blog_id = wp_insert_post(array(
            'post_title'    => 'Blog - Tous nos articles',
            'post_content'  => '<!-- wp:shortcode -->[category_hub]<!-- /wp:shortcode -->',
            'post_status'   => 'publish',
            'post_type'     => 'page',
            'post_name'     => 'blog',
            'post_author'   => 1
        ));

        if ($blog_id) {
            update_option('page_for_posts', $blog_id);
        }
    }
}, 20);

// 8. Fix pagination for numeric categories
add_action('pre_get_posts', function($query) {
    if (!$query->is_main_query() || is_admin()) return;

    if ($query->is_category()) {
        $cat_id = $query->get('cat');
        if ($cat_id) {
            $paged = get_query_var('paged') ? get_query_var('paged') : 1;
            $query->set('paged', $paged);
        }
    }
}, 10, 1);
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