/**
 * Process the uploaded CSV. Under admin_init with capability + nonce (2026-09-16; it used to run inside the page render).
 */
function lum_handle_csv_process() {
    if (!isset($_POST['process_csv'])) return;
    if (!current_user_can('manage_options')) wp_die('Unauthorized');
    check_admin_referer('lum_csv_process', 'lum_csv_process_nonce');

    $csv_file_path = get_option('lum_uploaded_csv');
    error_log("DEBUG: Retrieved CSV file path for processing: " . json_encode($csv_file_path));

    if (!empty($csv_file_path) && file_exists($csv_file_path)) {
        lum_process_csv();

        delete_option('lum_uploaded_csv');
        if (file_exists($csv_file_path)) {
            unlink($csv_file_path);
        }
        delete_option('lum_csv_validation');
        update_option('lum_csv_processing_feedback', 'CSV processed successfully!');
        wp_safe_redirect(admin_url('admin.php?page=ld-user-manager&csv_done=1'));
        exit;
    }
    error_log("CSV Processing Error: File not found.");
}
add_action('admin_init', 'lum_handle_csv_process');