<?php

/*
 * Copyright (C) 2016 Champs-Libres <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 Chill\ActivityBundle\Security\Authorization\ActivityVoter;

/**
 * 
 *
 * @author Julien Fastré <julien.fastre@champs-libres.coop>
 */
class ReasonAggregator implements AggregatorInterface
{
    public function alterQuery(QueryBuilder $qb, $data)
    {
        // add select element
        if ($data['level'] === 'reason') {
            $elem = 'reason.id';
            $alias = 'activity_reason_id';
        } elseif ($data['level'] === 'category') {
            $elem = 'category.id';
            $alias = 'activity_category_id';
        } else {
            throw new \RuntimeException('the data provided are not recognised');
        }
        
        $qb->addSelect($elem.' as '.$alias);
        
        // make a jointure
        $qb->join('activity.reason', 'reason');
        // join category if necessary
        if ($alias === 'activity_category_id') {
            $qb->join('reason.category', 'category');
        }
        
        // add the "group by" part
        $groupBy = $qb->getDQLPart('groupBy');
        
        if (count($groupBy) > 0) {
            $qb->addGroupBy($alias);
        } else {
            $qb->groupBy($alias);
        }
    }

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

    public function buildForm(FormBuilderInterface $builder)
    {
        $builder->add('level', 'choice', array(
            'choices' => array(
                'By reason' => 'reason',
                'By category of reason' => 'category'
            ),
            'choices_as_values' => true,
            'multiple' => false,
            'expanded' => true
        ));
    }

    public function getTitle()
    {
        return "Aggregate by activity reason";
    }
    
    public function addRole()
    {
        return new Role(ActivityVoter::SEE);
    }

    public function getLabels($key, array $values, $data)
    {
        return array_combine($values, $values);
        
    }

    public function getQueryKeys($data)
    {
        // add select element
        if ($data['level'] === 'reason') {
            return array('activity_reason_id');
        } elseif ($data['level'] === 'category') {
            return array ('activity_category_id');
        } else {
            throw new \RuntimeException('the data provided are not recognised');
        }
        
    }

}