<?php

declare(strict_types=1);

/*
 * Chill is a software for social workers
 *
 * For the full copyright and license information, please view
 * the LICENSE file that was distributed with this source code.
 */

namespace Chill\PersonBundle\DataFixtures\Helper;

use Chill\PersonBundle\Entity\Person;
use Doctrine\ORM\EntityManagerInterface;

trait PersonRandomHelper
{
    private ?int $countPersons = null;

    private array $randPersons = [];

    protected function getRandomPerson(EntityManagerInterface $em): Person
    {
        $fetchBy = 5;

        if (null === $this->countPersons) {
            $qb = $em->createQueryBuilder();
            $this->countPersons = $qb->select('count(p)')
                ->from(Person::class, 'p')
                ->getQuery()
                ->getSingleScalarResult();
        }

        if ([] === $this->randPersons) {
            $qb = $em->createQueryBuilder();
            $this->randPersons = $qb
                ->select('p')
                ->from(Person::class, 'p')
                ->getQuery()
                ->setFirstResult(\random_int(0, $this->countPersons - $fetchBy))
                ->setMaxResults($fetchBy)
                ->getResult();
        }

        return \array_pop($this->randPersons);
    }
}