show categories in search.twig using event opencart - opencart

Question

i'm trying to show categories in search.twig using events for this i have create a module file to add event.
i am assuming after common/search controller is called the event will add categories to existing data variable and will send categories along all data from common/search controller. i have copied the code below
admin/controller/extention/module/cc_add_search_categories.php
public function install(){
$this->load->model('setting/event');
$this->model_setting_event->addEvent('ccaddsearchcategorise', 'catalog/controller/common/search/after', 'extension/module/cc_add_search_categories/addCategoriesToSearch');
}
public function uninstall(){
$this->load->model('setting/event');
$this->model_setting_event->deleteEventByCode('ccaddsearchcategorise');
}
and in
catalog/controller/extention/module/cc_add_search_categories.php
public function addCategoriesToSearch(&$route, &$data, &$output){
$this->load->model('catalog/category');
$this->load->language('extention/module/cc_add_search_category');
$data['categories'] = array('data');
$categories_1 = $this->model_catalog_category->getCategories(0);
foreach ($categories_1 as $category_1) {
$level_2_data = array();
$categories_2 = $this->model_catalog_category->getCategories($category_1['category_id']);
foreach ($categories_2 as $category_2) {
$level_3_data = array();
$categories_3 = $this->model_catalog_category->getCategories($category_2['category_id']);
foreach ($categories_3 as $category_3) {
$level_3_data[] = array(
'category_id' => $category_3['category_id'],
'name' => $category_3['name'],
);
}
$level_2_data[] = array(
'category_id' => $category_2['category_id'],
'name' => $category_2['name'],
'children' => $level_3_data
);
}
$data['categories'][] = array(
'category_id' => $category_1['category_id'],
'name' => $category_1['name'],
'children' => $level_2_data
);
}
}