<?php


namespace Chill\EventBundle\Search;

use Chill\MainBundle\Search\AbstractSearch;
use Doctrine\ORM\EntityRepository;
use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
use Chill\MainBundle\Security\Authorization\AuthorizationHelper;
use Symfony\Component\Templating\EngineInterface as TemplatingEngine;
use Doctrine\ORM\QueryBuilder;
use Symfony\Component\Security\Core\Role\Role;

/**
 * Search within Events.
 *
 * @author Julien Fastré <julien.fastre@champs-libres.coop>
 * @author Champs Libres <info@champs-libres.coop>
 */
class EventSearch extends AbstractSearch
{
    
    /**
     * 
     * @var EntityRepository
     */
    private $er;
    
    /**
     *
     * @var \Chill\MainBundle\Entity\User
     */
    private $user;
    
    /**
     *
     * @var AuthorizationHelper 
     */
    private $helper;
    
    /**
     *
     * @var TemplatingEngine
     */
    private $templating;
    
    
    public function __construct(
          TokenStorageInterface $tokenStorage,
          EntityRepository $eventRepository,
          AuthorizationHelper $authorizationHelper,
          TemplatingEngine $templating
          )
    {
        $this->user = $tokenStorage->getToken()->getUser();
        $this->er = $eventRepository;
        $this->helper = $authorizationHelper;
        $this->templating = $templating;
    }
    
    public function supports($domain)
    {
        return 'event' === $domain or 'events' === $domain;
    }
    
    public function isActiveByDefault()
    {
        return false;
    }
    
    public function getOrder()
    {
        return 3000;
    }

    public function renderResult(array $terms, $start = 0, $limit = 50, array $options = array())
    {
        return $this->templating->render('ChillEventBundle:Event:list.html.twig', 
                array( 
                    'events' => $this->search($terms, $start, $limit, $options),
                    'pattern' => $this->recomposePattern($terms, array(), $terms['_domain']),
                    'total' => $this->count($terms)
                ));
    }
    
    protected function search(array $terms, $start, $limit, $options)
    {
        $qb = $this->er->createQueryBuilder('e');
        $qb->select('e');
        $this->composeQuery($qb, $terms)
              ->setMaxResults($limit)
              ->setFirstResult($start)
              ->orderBy('e.date', 'DESC')
              ;
        
        return $qb->getQuery()->getResult();
    }
    
    protected function count(array $terms)
    {
        $qb = $this->er->createQueryBuilder('e');
        $qb->select('COUNT(e)');
        $this->composeQuery($qb, $terms)
              ;
        
        return $qb->getQuery()->getSingleScalarResult();
    }
    
    protected function composeQuery(QueryBuilder &$qb, $terms)
    {
        
        // add security clauses
        $reachableCenters = $this->helper
              ->getReachableCenters($this->user, new Role('CHILL_EVENT_SEE'));
        
        if (count($reachableCenters) === 0) {
            // add a clause to block all events
            $where = $qb->expr()->isNull('e.center');
            $qb->andWhere($where);
        } else {
            
            $n = 0;
            $orWhere = $qb->expr()->orX();
            foreach ($reachableCenters as $center) {
                $circles = $this->helper->getReachableScopes($this->user, 
                                  new Role('CHILL_EVENT_SEE'), $center);
                $where = $qb->expr()->andX(
                      $qb->expr()->eq('e.center', ':center_'.$n),
                      $qb->expr()->in('e.circle', ':circle_'.$n)
                      );
                $qb->setParameter('center_'.$n, $center);
                $qb->setParameter('circle_'.$n, $circles);
                $orWhere->add($where);
            }
            
            $qb->andWhere($orWhere);
        }
        
        
        return $qb;
    }
}