<?php
/*
 * Copyright (C) 2019 Champs Libres Cooperative <info@champs-libres.coop>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
namespace Chill\ActivityBundle\Export\Aggregator;

use Symfony\Component\Form\FormBuilderInterface;
use Doctrine\ORM\QueryBuilder;
use Chill\MainBundle\Export\AggregatorInterface;
use Symfony\Component\Security\Core\Role\Role;
use Doctrine\ORM\Query\Expr\Join;
use Chill\ActivityBundle\Security\Authorization\ActivityStatsVoter;
use Doctrine\ORM\EntityManagerInterface;
use Chill\MainBundle\Entity\User;

/**
 * 
 *
 * @author Julien Fastré <julien.fastre@champs-libres.coop>
 */
class ActivityUserAggregator implements AggregatorInterface
{
    /**
     *
     * @var EntityManagerInterface
     */
    protected $em;
    
    const KEY = 'activity_user_id';
    
    function __construct(EntityManagerInterface $em)
    {
        $this->em = $em;
    }
    
    public function addRole()
    {
        return new Role(ActivityStatsVoter::STATS);
    }

    public function alterQuery(QueryBuilder $qb, $data)
    {
        // add select element    
        $qb->addSelect(sprintf('IDENTITY(activity.user) AS %s', self::KEY));
        
        // add the "group by" part
        $qb->addGroupBy(self::KEY);
    }

    public function applyOn(): string
    {
        return 'activity';
    }

    public function buildForm(FormBuilderInterface $builder)
    {
        // nothing to add
    }

    public function getLabels($key, $values, $data): \Closure
    {
        // preload users at once
        $this->em->getRepository(User::class)
            ->findBy(['id' => $values]);
        
        return function($value) {
            switch ($value) {
                case '_header':
                    return 'activity user';
                default:
                    return $this->em->getRepository(User::class)->find($value)
                        ->getUsername();
            }
        };
    }

    public function getQueryKeys($data)
    {
        return [ self::KEY ];
    }

    public function getTitle(): string
    {
        return "Aggregate by activity user";
    }
}