*
        Cache category ids FOR product breadcrumps; 
     */
    public function cacheCategoryIds(){
        $identifier='network_cache_category_ids';
        $this->cache = \Magento\Framework\App\ObjectManager::getInstance()->get('\Magento\Framework\App\CacheInterface');
        if(!$this->cache->load($identifier)){
            $data=$this->getCategoriesToCache();
            $tags=array();
            $this->cache->save($data, $identifier, $tags, 60*5);
        }
        return $this->cache->load($identifier);

    }

    public function getCategoriesToCache(){
        $connection = \Magento\Framework\App\ObjectManager::getInstance()->get('Magento\Framework\App\ResourceConnection')->getConnection('\Magento\Framework\App\ResourceConnection::DEFAULT_CONNECTION'); 
        $result = $connection->fetchCol("SELECT entity_id FROM m2_catalog_category_entity_text where attribute_id='161' and value!='' and store_id='0'; ");
        return $this->getSerializer()->serialize($result);
    }

    public function getCategoriesFromCache(){
        return $this->getSerializer()->unserialize($this->cacheCategoryIds());
    }

    private function getSerializer()
    {
        if ($this->serializer === null) {
            $this->serializer = \Magento\Framework\App\ObjectManager::getInstance()
                ->get('\Magento\Framework\Serialize\Serializer\Json');
        }
        return $this->serializer;
    }
    
    public function  getParentIds($categoryId = false)
    {
        $categoryFactory = \Magento\Framework\App\ObjectManager::getInstance()->get('\Magento\Catalog\Model\CategoryFactory');
        $categoryHelper = \Magento\Framework\App\ObjectManager::getInstance()->get('\Magento\Catalog\Helper\Category');
        $categoryRepository = \Magento\Framework\App\ObjectManager::getInstance()->get('\Magento\Catalog\Model\CategoryRepository');
        $category = $categoryFactory->create()->load($categoryId);   
        foreach ($category->getParentCategories() as $cat) {
           $ids[]=array('id'=> $cat->getId(),
                  'name'=> $cat->getName(),
                  'url'=> explode('?', $cat->getUrl())[0]);
        }
        return $ids;  
    }

    public function getBreadCrumpsCatIds($current_cats){
        $data = array_intersect($current_cats, $this->getCategoriesFromCache());
        if(!empty($data)){
        	$id = max($data);
        	return $this->getParentIds($id);
        }
        else{
        	return array();
        }
        //return $this->getParentIds($id);
        //return array_intersect($current_cats, $this->getCategoriesFromCache())
    }

    public function renderBreadCrumps($current_cats){
        $i=1;
        $script = '<script type="application/ld+json">{
                    "@context": "https://schema.org",
                    "@type":"BreadcrumbList",
                    "itemListElement": [
                    {"@type":"ListItem","position":'.$i.',"item":{"@id":"https://bookland.com.pl/","name":"Bookland"}},';                   
        foreach ($this->getBreadCrumpsCatIds($current_cats) as $value) {
            $i++;
            $script .='{"@type":"ListItem","position":'.$i.',"item":{"@id":"'.$value['url'].'","name":"'.$value['name'].'"}},';
        }
        $script=rtrim($script,',');
   $script.=']}</script>';
   return $script;
    }