Preloader.php

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<?php

namespace Elgg\Comments;

class Preloader {

    public function __construct(protected DataService $data) {
    }

    public function preloadForList(array $items): void {
        $guids = $this->getGuidsToPreload($items);
    
        $this->preloadCountsFromQuery($guids);
    }

    protected function preloadCountsFromQuery(array $guids): void {
        if (empty($guids)) {
            return;
        }
        
        $count_rows = elgg_get_entities([
            'type' => 'object',
            'subtype' => 'comment',
            'container_guids' => $guids,
            'selects' => ['e.container_guid', 'COUNT(*) AS cnt'],
            'group_by' => 'e.container_guid',
            'limit' => false,
            'callback' => false,
        ]);
        
        foreach ($guids as $guid) {
            $this->data->setCommentsCount($guid, 0);
        }
        
        foreach ($count_rows as $row) {
            $this->data->setCommentsCount($row->container_guid, $row->cnt);
        }
    }

    protected function getGuidsToPreload(array $items): array {
        $guids = [];

        foreach ($items as $item) {
            if ($item instanceof \ElggEntity) {
                if ($item->hasCapability('commentable')) {
                    $guids[$item->guid] = true;
                }
            } elseif ($item instanceof \ElggRiverItem) {
                $guids[$item->object_guid] = true;
            }
        }
        
        return $this->data->filterGuids(array_keys($guids));
    }
    
    public static function preload(\Elgg\Event $event): void {
        $vars = $event->getValue();
        
        $items = (array) elgg_extract('items', $vars, []);
        if (!elgg_is_logged_in() || count($items) < 3) {
            return;
        }
        
        $preload = elgg_extract('preload_comments_count', $vars);
        if (!isset($preload)) {
            $list_class = elgg_extract('list_class', $vars);
            $preload = !elgg_in_context('widgets') && in_array($list_class, ['elgg-list-river', 'elgg-list-entity', 'comments-list']);
        }
        
        if (!$preload) {
            return;
        }
        
        $preloader = new self(\Elgg\Comments\DataService::instance());
        $preloader->preloadForList($items);
    }
}