Switching from multilang to default lang in codeigniter - codeigniter

Question

We are using a multilanguage website like
www.example.com/en/ www.example.com/es/
we have roout config like this
$route['switch-language/language/(:any)'] = 'switch_language/language/$1';
$route['en/page/(:any)'] = 'page/view/$1';
$route['fr/page/(:any)'] = 'page/view/$1';
$route['es/page/(:any)'] = 'page/view/$1';
$route['pt/page/(:any)'] = 'page/view/$1';
We have a posiblity of turning off language switcher. When we turned off on url we have still www.example.com/en/ format.
Is there a way not showing language tag on the url when multilang switcher is turned off?
Language switcher controlles is like this
class Switch_language extends CI_Controller {
public function __construct() {
parent::__construct ();
}
function language($language = "") {
$this->load->model('template_model', '', TRUE);
$language = ($language != "") ? $language : "english";
$this->session->set_userdata ( 'site_lang', $language );
$language_iso = $this->template_model->get_language_iso2_from_language_key($language);
$this->session->set_userdata('site_lang_iso', strtolower($language_iso));
//redirect ( base_url () );
if(isset($_SERVER["HTTP_REFERER"])){
//redirect($_SERVER["HTTP_REFERER"]);
redirect ( base_url ().strtolower($language_iso) );
}
else{
redirect ( base_url () );
}
}
function language_code() {
if ($this->input->post ( 'language_save' )) {
$this->load->model('template_model', '', TRUE);
$language = $this->input->post ( 'language_key' );
$language = ($language != "") ? $language : "english";
$this->session->set_userdata ( 'site_lang', $language );
$language_iso = $this->template_model->get_language_iso2_from_language_key($language);
$this->session->set_userdata('site_lang_iso', strtolower($language_iso));
//redirect ( base_url () );
if(isset($_SERVER["HTTP_REFERER"])){
//redirect($_SERVER["HTTP_REFERER"]);
redirect ( base_url ().strtolower($language_iso) );
}
else{
redirect ( base_url () );
}
}
}
}
When i remove lang tags from route manually is ok. But need something automatic.
When turned off route would be
$route['page/(:any)'] = 'page/view/$1';
need some logic to solve this issue.