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function add_custom_js_for_canvas_users() {
    // Check if the user agent contains 'canvas' (case insensitive)
    if (strpos(strtolower($_SERVER['HTTP_USER_AGENT']), 'canvas') !== false) {
        if (is_user_logged_in()) {
            // Get the current user
            $current_user = wp_get_current_user();
            // Get the user email
            $user_email = $current_user->user_email;
        } else {
            // User is logged out, set user email to empty
            $user_email = '';
        }
        
        // Output the script in the footer section
        echo "
        <script>
            document.addEventListener('DOMContentLoaded', function() {
                setTimeout(function() {
                    nativeFunctions.onesignalSetExternalUserId('$user_email');
                }, 1000); // Delay by 1000 milliseconds (1 second)
            });
        </script>
        ";
    }
}
add_action('wp_footer', 'add_custom_js_for_canvas_users');