<?php
if ( ! defined( 'ABSPATH' ) ) {
    exit; // Exit if accessed directly
}
// Advanced Redirect Manager (expands basic redirects with regex, 404 logging, export)
function clarity_seo_handle_redirects() {
    if (is_404() && isset($_SERVER['REQUEST_URI'])) {
        $redirects = get_option('clarity_seo_redirects', []);
        $current_url = sanitize_text_field(wp_unslash($_SERVER['REQUEST_URI']));

        // Log 404
        $logs = get_option('clarity_seo_404_logs', []);
        $logs[] = ['url' => $current_url, 'time' => current_time('mysql'), 'referer' => wp_get_referer()];
        update_option('clarity_seo_404_logs', array_slice($logs, -100)); // Keep last 100

        // Check for match, support regex
        foreach ($redirects as $from => $to) {
            if (preg_match('#^' . str_replace('#', '\\#', $from) . '$#', $current_url)) {
                wp_safe_redirect($to, 301);
                exit;
            }
        }
    }
}

// 404 Monitor callback
function clarity_seo_404_callback() {
    $logs = get_option('clarity_seo_404_logs', []);
    ?>
    <div class="wrap">
        <h1><?php esc_html_e('404 Monitor', 'clarity-seo'); ?></h1>
        <?php if (!empty($logs)): ?>
            <table class="wp-list-table widefat fixed striped">
                <thead><tr><th>URL</th><th>Time</th><th>Referer</th></tr></thead>
                <tbody>
                    <?php foreach (array_reverse($logs) as $log): ?>
                        <tr>
                            <td><?php echo esc_html($log['url']); ?></td>
                            <td><?php echo esc_html($log['time']); ?></td>
                            <td><?php echo esc_html($log['referer']); ?></td>
                        </tr>
                    <?php endforeach; ?>
                </tbody>
            </table>
            <form method="post" action="<?php echo esc_url(admin_url('admin-post.php')); ?>">
                <input type="hidden" name="action" value="clarity_seo_export_404">
                <?php wp_nonce_field('clarity_seo_export_404'); ?>
                <?php submit_button(__('Export CSV', 'clarity-seo'), 'secondary'); ?>
            </form>
        <?php else: ?>
            <p><?php esc_html_e('No 404 logs yet.', 'clarity-seo'); ?></p>
        <?php endif; ?>
    </div>
    <?php
}

// Export 404 logs to CSV
add_action('admin_post_clarity_seo_export_404', function() {
    check_admin_referer('clarity_seo_export_404');
    $logs = get_option('clarity_seo_404_logs', []);
    header('Content-Type: text/csv');
    header('Content-Disposition: attachment; filename="404_logs.csv"');
    $output = fopen('php://output', 'w');
    fputcsv($output, ['URL', 'Time', 'Referer']);
    foreach ($logs as $log) {
        fputcsv($output, $log);
    }
    exit;
});
?>