<?php
/*
 * Chill is a software for social workers
 *
 * Copyright (C) 2019, Champs Libres Cooperative SCRLFS, <http://www.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\MainBundle\CRUD\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Doctrine\ORM\QueryBuilder;
use Chill\MainBundle\Pagination\PaginatorFactory;

/**
 * 
 *
 */
abstract class CRUDController extends Controller
{
    /**
     *
     * @var PaginatorFactory
     */
    protected $paginatorFactory;
    
    abstract protected function getEntity(): string;
    
    abstract protected function orderingOptions(): array;
    
    protected function getDefaultOrdering(): array
    {
        return $this->orderingOptions();
    }
    
    protected function getTemplate($action): string
    {
        switch($action) {
            case 'index': 
                return '@ChillMain\CRUD\index.html.twig';
            default:
                throw new LogicException("action not supported: $action");
        }
    }
    
    protected function getTemplateParameters($action): array
    {
        return [];
    }
    
    protected function processTemplateParameters($action): array
    {
        $configured = $this->getTemplateParameters($action);
        
        switch($action) {
            case 'index': 
                $default = [
                    'columns' => $this->getDoctrine()->getManager()
                        ->getClassMetadata($this->getEntity())
                        ->getIdentifierFieldNames(),
                    'actions' => ['edit', 'delete']
                ];
                break;
            default:
                throw new \LogicException("this action is not supported: $action");
        }
        
        $result = \array_merge($default, $configured);
        
        // add constants
        $result['class'] = $this->getEntity();
        
        return $result;
    }
    
    protected function orderQuery(QueryBuilder $query, Request $request): QueryBuilder
    {
        $defaultOrdering = $this->getDefaultOrdering();
        
        foreach ($defaultOrdering as $sort => $order) {
            $query->addOrderBy('e.'.$sort, $order);
        }
        
        return $query;
    }
    
    public function index(Request $request)
    {
        $totalItems = $this->getDoctrine()->getManager()
            ->createQuery("SELECT COUNT(e) FROM ".$this->getEntity()." e")
            ->getSingleScalarResult()
            ;
        
        $query = $this->getDoctrine()->getManager()
            ->createQueryBuilder()
            ->select('e')
            ->from($this->getEntity(), 'e');
        
        $this->orderQuery($query, $request);
        
        $paginator = $this->paginatorFactory->create($totalItems);
        
        $query->setFirstResult($paginator->getCurrentPage()->getFirstItemNumber())
            ->setMaxResults($paginator->getItemsPerPage())
            ;
        
        $entities = $query->getQuery()->getResult();
        
        return $this->render($this->getTemplate('index'), \array_merge([
                'entities' => $entities,
            ], $this->processTemplateParameters('index'))
        );
    }
}