<?php

declare(strict_types=1);

/**
 * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
 *
 * Copyright (C) 2019 Jan Böhmer (https://github.com/jbtronics)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

namespace App\DataTables\Adapter;

use Doctrine\ORM\Query;
use Doctrine\ORM\QueryBuilder;
use Omines\DataTablesBundle\Adapter\AdapterQuery;
use Omines\DataTablesBundle\Adapter\Doctrine\ORMAdapter;
use Omines\DataTablesBundle\Column\AbstractColumn;
use Traversable;

/**
 * Override default ORM Adapter, to allow fetch joins (allow addSelect with ManyToOne Collections).
 * This should improves performance for Part Tables.
 * Based on: https://github.com/omines/datatables-bundle/blob/master/tests/Fixtures/AppBundle/DataTable/Adapter/CustomORMAdapter.php.
 */
class CustomORMAdapter extends ORMAdapter
{
    protected $hydrationMode;

    public function configure(array $options): void
    {
        parent::configure($options);
        $this->hydrationMode = $options['hydrate'] ?? Query::HYDRATE_OBJECT;
    }

    protected function prepareQuery(AdapterQuery $query): void
    {
        parent::prepareQuery($query);
        $query->setIdentifierPropertyPath(null);
    }

    /**
     * @return Traversable
     */
    protected function getResults(AdapterQuery $query): Traversable
    {
        /** @var QueryBuilder $builder */
        $builder = $query->get('qb');
        $state = $query->getState();
        // Apply definitive view state for current 'page' of the table
        foreach ($state->getOrderBy() as [$column, $direction]) {
            /** @var AbstractColumn $column */
            if ($column->isOrderable()) {
                $builder->addOrderBy($column->getOrderField(), $direction);
            }
        }
        if ($state->getLength() > 0) {
            $builder
                ->setFirstResult($state->getStart())
                ->setMaxResults($state->getLength());
        }
        /*
         * Use foreach instead of iterate to prevent group by from crashing
         */
        foreach ($builder->getQuery()->getResult($this->hydrationMode) as $result) {
            /*
             * Return everything instead of first element
             */
            yield $result;
        }
    }
}