public function forgot_password(){
  // setting validation rules by checking whether identity is identity or email
  if($this->config->item('identity', 'ion_auth') != 'email' ){
    $this->form_validation->set_rules('identity', $this->lang->line('forgot_password_username_label'), 'required');
  }
    else{
      $this->form_validation->set_rules('identity', $this->lang->line('forgot_password_validation_email_label'), 'required|valid_email');
    }

  if ($this->form_validation->run() == false){
    $this->data['type'] = $this->config->item('identity','ion_auth');
    // setup the input
    $this->data['identity'] = array('name' => 'identity',
      'id' => 'identity',
    );

    if ( $this->config->item('identity', 'ion_auth') != 'email' ){
      $this->data['username_label'] = $this->lang->line('forgot_password_username_label');
    }
      else{
        $this->data['username_label'] = $this->lang->line('forgot_password_email_username_label');
      }

      // set any errors and display the form
      $this->data['message'] = (validation_errors()) ? validation_errors() : $this->session->flashdata('message');
      $this->_render_page('back/auth/forgot_password', $this->data);
  }
    else{
      $identity_column = $this->config->item('identity','ion_auth');
      $identity = $this->ion_auth->where($identity_column, $this->input->post('identity'))->users()->row();

      if(empty($identity)) {
        if($this->config->item('identity', 'ion_auth') != 'email'){
          $this->ion_auth->set_error('forgot_password_username_not_found');
        }
          else{
            $this->ion_auth->set_error('forgot_password_email_not_found');
          }

        $this->session->set_flashdata('message', $this->ion_auth->errors());
        redirect("admin/auth/forgot_password", 'refresh');
      }

      // run the forgotten password method to email an activation code to the user
      $forgotten = $this->ion_auth->forgotten_password($identity->{$this->config->item('identity', 'ion_auth')});
      if ($forgotten){
        $config = [
             'smtp_host' => 'ssl://smtp.gmail.com',
             'smtp_user' => 'azmicolejr@gmail.com',   // Ganti dengan email gmail Anda.
             'smtp_pass' => 'password',             // Password gmail Anda.
             'smtp_port' => 465,
             'mailtype' => 'html',
        ];

        // Pengirim dan penerima email.
        $this->email->from('no-reply@azmicolejr.com', 'no-reply');    // Email dan nama pegirim.
        $this->email->to($forgotten['identity']);                       // Penerima email.

        $data = array(
          'identity'=>$forgotten['identity'],
          'forgotten_password_code' => $forgotten['forgotten_password_code'],
        );

        // Load library email dan konfigurasinya.
        $this->load->library('email');
        $this->email->initialize($config);

        // Subject email.
        $this->email->subject('Permintaan Lupa Password');

        // Isi email. Bisa dengan format html.
        $body = $this->load->view('back/auth/email/forgot_password.tpl.php',$data,TRUE);
        $this->email->message($body);

        if ($this->email->send()) {
          $this->session->set_flashdata('message',$this->ion_auth->messages());
          redirect('admin/auth/login');
        }
        else {
          $this->session->set_flashdata('message', $this->ion_auth->errors());
          redirect('admin/auth/login');
        }
      }
        else{
          $this->session->set_flashdata('message', $this->ion_auth->errors());
          redirect("admin/auth/forgot_password", 'refresh');
        }
    }
}