<?php

namespace Knp\Component\Pager\Event\Subscriber\Paginate;

use Knp\Component\Pager\Event\ItemsEvent;
use Solarium\Client;
use Solarium\QueryType\Select\Query\Query;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;

/**
 * Solarium query pagination.
 *
 * @author Paweł Jędrzejewski <pjedrzejewski@diweb.pl>
 */
class SolariumQuerySubscriber implements EventSubscriberInterface
{
    public function items(ItemsEvent $event): void
    {
        if (is_array($event->target) && 2 === count($event->target)) {
            $values = array_values($event->target);
            [$client, $query] = $values;

            if ($client instanceof Client && $query instanceof Query) {
                $query->setStart($event->getOffset())->setRows($event->getLimit());
                $solrResult = $client->select($query);

                $event->items  = iterator_to_array($solrResult->getIterator());
                $event->count  = $solrResult->getNumFound();
                $event->setCustomPaginationParameter('result', $solrResult);
                $event->stopPropagation();
            }
        }
    }

    public static function getSubscribedEvents(): array
    {
        return [
            'knp_pager.items' => ['items', 0], /* triggers before a standard array subscriber*/
        ];
    }
}