<script type="application/ld+json">
{
  "@context": "https://schema.org",
  "@type": "BreadcrumbList",
  "itemListElement": [
    {
      "@type": "ListItem",
      "position": 1,
      "name": "Home",
      "item": "https://yoursite.com/"
    },
    {
      "@type": "ListItem",
      "position": 2,
      "name": "SEO Guide",
      "item": "https://yoursite.com/seo-guide/"
    },
    {
      "@type": "ListItem",
      "position": 3,
      "name": "Technical SEO",
      "item": "https://yoursite.com/seo-guide/technical-seo/"
    },
    {
      "@type": "ListItem",
      "position": 4,
      "name": "Breadcrumbs Implementation",
      "item": "https://yoursite.com/seo-guide/technical-seo/breadcrumbs/"
    }
  ]
}
</script>

function generate_breadcrumb_schema() {
    if ( is_front_page() ) return; // Skip homepage
    
    $breadcrumbs = array();
    $position = 1;
    
    // Always start with homepage
    $breadcrumbs[] = array(
        '@type' => 'ListItem',
        'position' => $position++,
        'name' => 'Home',
        'item' => home_url('/')
    );
    
    // Add category/archive if applicable
    if ( is_single() && !is_page() ) {
        $categories = get_the_category();
        if ( $categories ) {
            $category = $categories[0];
            $breadcrumbs[] = array(
                '@type' => 'ListItem',
                'position' => $position++,
                'name' => $category->name,
                'item' => get_category_link( $category->term_id )
            );
        }
    } elseif ( is_category() ) {
        $category = get_queried_object();
        $breadcrumbs[] = array(
            '@type' => 'ListItem',
            'position' => $position++,
            'name' => $category->name,
            'item' => get_category_link( $category->term_id )
        );
    } elseif ( is_page() && $post->post_parent ) {
        // Add parent pages
        $parent_id = $post->post_parent;
        $parents = array();
        
        while ( $parent_id ) {
            $page = get_post( $parent_id );
            $parents[] = array(
                'name' => get_the_title( $page->ID ),
                'url' => get_permalink( $page->ID )
            );
            $parent_id = $page->post_parent;
        }
        
        // Reverse to show correct order
        $parents = array_reverse( $parents );
        
        foreach ( $parents as $parent ) {
            $breadcrumbs[] = array(
                '@type' => 'ListItem',
                'position' => $position++,
                'name' => $parent['name'],
                'item' => $parent['url']
            );
        }
    }
    
    // Add current page
    $breadcrumbs[] = array(
        '@type' => 'ListItem',
        'position' => $position,
        'name' => get_the_title(),
        'item' => get_permalink()
    );
    
    // Generate Schema
    $schema = array(
        '@context' => 'https://schema.org',
        '@type' => 'BreadcrumbList',
        'itemListElement' => $breadcrumbs
    );
    
    echo '<script type="application/ld+json">';
    echo json_encode( $schema, JSON_UNESCAPED_SLASHES | JSON_PRETTY_PRINT );
    echo '</script>';
}

// Add to wp_head
add_action( 'wp_head', 'generate_breadcrumb_schema' );