/**
  * save contact form settings
  * @param object $contact_form: current contact form instance;
  */
 public function _hw_wpcf7_save_contact_form($contact_form)
 {
     $properties = $contact_form->get_properties();
     $additional_settings = array();
     //set additional_settings
     //$properties = array();
     //enable private skin
     if (isset($_POST['hw_wpcf7_use_skin'])) {
         $properties['hw_wpcf7_use_skin'] = trim($_POST['hw_wpcf7_use_skin']);
     } else {
         $properties['hw_wpcf7_use_skin'] = 'off';
     }
     //get selected skin
     if (isset($_POST['hw_wpcf7_skin'])) {
         //contact form skin
         $properties['hw_wpcf7_skin'] = trim($_POST['hw_wpcf7_skin']);
     }
     //skin setting
     if (isset($_POST['hw_wpcf7skin_setting'])) {
         $properties['hw_wpcf7skin_setting'] = $_POST['hw_wpcf7skin_setting'];
     }
     if (isset($_POST['hw_custom_css'])) {
         //custom css
         $properties['hw_custom_css'] = trim($_POST['hw_custom_css']);
     }
     /*form attributes*/
     if (isset($_POST['hw_form_class_attr'])) {
         $properties['hw_form_class_attr'] = trim($_POST['hw_form_class_attr']);
     }
     //form class attr
     if (isset($_POST['hw_form_id_attr'])) {
         $properties['hw_form_id_attr'] = trim($_POST['hw_form_id_attr']);
     }
     //form id attr
     if (isset($_POST['hw_form_name_attr'])) {
         $properties['hw_form_name_attr'] = trim($_POST['hw_form_name_attr']);
     }
     //form name attr
     if (isset($_POST['hw_form_enctype_attr'])) {
         $properties['hw_form_enctype_attr'] = trim($_POST['hw_form_enctype_attr']);
     }
     //form enctype
     //save storage hook
     if (isset($_POST['hwcf_data_hook'])) {
         $properties['hwcf_data_hook'] = trim($_POST['hwcf_data_hook']);
     }
     /**
      * google form hook
      */
     if (isset($_POST['hw_gformID'])) {
         //save google form ID
         $properties['hw_gformID'] = trim($_POST['hw_gformID']);
     }
     if (isset($_POST['enable_email_by_gapp'])) {
         //enable send mail through google form ID
         $properties['enable_email_by_gapp'] = trim($_POST['enable_email_by_gapp']);
     } else {
         $properties['enable_email_by_gapp'] = 'off';
     }
     //enable default gform from hoangweb google acc
     if (isset($_POST['hw_default_gform'])) {
         $properties['hw_gformID'] = hw_wpcf7_default_gform();
         unset($_POST['hw_default_gform']);
         //clear this option
     }
     //populate form event
     if (isset($_POST['hw_sent_ok_redirect_page'])) {
         $properties['hw_sent_ok_redirect_page'] = trim($_POST['hw_sent_ok_redirect_page']);
     }
     //on_sent_ok js event after form success sent data
     if (isset($_POST['hw_on_sent_ok_js_event'])) {
         $properties['hw_on_sent_ok_js_event'] = trim($_POST['hw_on_sent_ok_js_event']);
         $additional_settings[] = 'on_sent_ok: "' . esc_attr($properties['hw_on_sent_ok_js_event']) . '"';
     }
     //on_submit js event after form submit whatever event send error
     if (isset($_POST['hw_on_submit_js_event'])) {
         $properties['hw_on_submit_js_event'] = trim($_POST['hw_on_submit_js_event']);
         $additional_settings[] = 'on_submit: "' . esc_attr($properties['hw_on_submit_js_event']) . '"';
     }
     //web hook url
     if (isset($_POST['hook_url'])) {
         $properties['hook_url'] = trim($_POST['hook_url']);
     }
     //$current = WPCF7_ContactForm::get_current();
     //__save_session('properties',$properties);__save_session('temp',$this->template->get_form_template($properties['hw_form_template']));
     if (isset($_POST['hw_form_template']) && $_POST['hw_form_template'] !== $properties['hw_form_template'] && isset($properties['hw_form_template']) && $this->template->get_form_template(trim($_POST['hw_form_template']))) {
         //form template
         $properties['hw_form_template'] = trim($_POST['hw_form_template']);
         //save form template
         $new_fields = $this->template->parse_form_template_fields($properties['hw_form_template']);
         //update exists form to new selected template
         $properties['form'] = $new_fields;
         //update mail template
         $properties['mail'] = $this->template->mail_template($properties['hw_form_template']);
     }
     //update additional_settings to this form
     if (count($additional_settings)) {
         $properties['additional_settings'] = join("\n", $additional_settings);
     }
     $contact_form->set_properties($properties);
     //update cf settings
     #__save_session('_POST',$_POST);
     //save current skin for enqueue
     if (!empty($properties['hw_wpcf7_skin'])) {
         $this->skin->save_skin_assets(array('skin' => array('hash_skin' => $properties['hw_wpcf7_skin'], 'hwskin_condition' => $properties['hw_wpcf7skin_setting']['hwskin_condition'], 'theme_options' => $properties['hw_wpcf7skin_setting']['skin_options']), 'status' => $properties['hw_wpcf7_use_skin'] == 'off' ? 0 : 1, 'object' => 'hw-wpcf7'));
     }
 }