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<?php

namespace School;

use School\Persistence\GroupStore;
use School\Persistence\PupilStore;
use School\Model\TooManyPupilsException;

class GroupService
{
    public function add($id, $pupilId)
    {
        if (strlen($id) <= 5) {
            $store = GroupStore::instance();
            $group = $store->find($id);

            $pupils = $group->getPupils();
            if (count($pupils) <= 5) {
                $addPupil = PupilStore::instance()->find($pupilId);
                $tmp = false;
                foreach ($pupils as $pupil) {
                    if ($pupil->getId() == $addPupil->getId()) {
                        $tmp = true;
                    }
                }
                if(!$tmp) {
                    $group->addPupil($addPupil);
                    $store->persist($group);
                }
            } else {
                throw new TooManyPupilsException();
            }
        } else {
            throw new \RuntimeException('Group ID invalid.');
        }
    }
}