<?php

namespace Chill\PersonBundle\Search;


use Chill\MainBundle\Pagination\PaginatorFactory;
use Chill\MainBundle\Search\AbstractSearch;
use Chill\MainBundle\Search\SearchInterface;
use Chill\MainBundle\Security\Authorization\AuthorizationHelper;
use Doctrine\ORM\EntityManagerInterface;
use Symfony\Component\DependencyInjection\ContainerAwareInterface;
use Symfony\Component\DependencyInjection\ContainerAwareTrait;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorage;
use Symfony\Component\Security\Core\Role\Role;

/**
 * Class SimilarityPersonSearch
 *
 * @package Chill\PersonBundle\Search
 */
class SimilarityPersonSearch extends AbstractSearch
{
    
    use ContainerAwareTrait;
    
    /**
     *
     * @var EntityManagerInterface
     */
    private $em;
    
    /**
     *
     * @var \Chill\MainBundle\Entity\User
     */
    private $user;
    
    /**
     *
     * @var AuthorizationHelper
     */
    private $helper;
    
    /**
     *
     * @var PaginatorFactory
     */
    protected $paginatorFactory;
    
    const NAME = "person_similarity";
    
    
    /**
     * SimilarityPersonSearch constructor.
     *
     * @param EntityManagerInterface $em
     * @param TokenStorage $tokenStorage
     * @param AuthorizationHelper $helper
     * @param PaginatorFactory $paginatorFactory
     */
    public function __construct(
        EntityManagerInterface $em,
        TokenStorage $tokenStorage,
        AuthorizationHelper $helper,
        PaginatorFactory $paginatorFactory)
    {
        $this->em = $em;
        $this->user = $tokenStorage->getToken()->getUser();
        $this->helper = $helper;
        $this->paginatorFactory = $paginatorFactory;
        
        // throw an error if user is not a valid user
        if (!$this->user instanceof \Chill\MainBundle\Entity\User) {
            throw new \LogicException('The user provided must be an instance'
                . ' of Chill\MainBundle\Entity\User');
        }
    }
    
    /*
     * (non-PHPdoc)
     * @see \Chill\MainBundle\Search\SearchInterface::getOrder()
     */
    public function getOrder()
    {
        return 200;
    }
    
    /*
     * (non-PHPdoc)
     * @see \Chill\MainBundle\Search\SearchInterface::isActiveByDefault()
     */
    public function isActiveByDefault()
    {
        return true;
    }
    
    public function supports($domain, $format)
    {
        return 'person' === $domain;
    }
    
    /**
     * @param array $terms
     * @param int $start
     * @param int $limit
     * @param array $options
     * @param string $format
     * @return array
     */
    public function renderResult(array $terms, $start = 0, $limit = 50, array $options = array(), $format = 'html')
    {
        $total = $this->count($terms);
        $paginator = $this->paginatorFactory->create($total);
        
        if ($format === 'html') {
            return $this->container->get('templating')->render('ChillPersonBundle:Person:list.html.twig',
                array(
                    'persons' => $this->search($terms, $start, $limit, $options),
                    'pattern' => $this->recomposePattern($terms, array('nationality',
                        'firstname', 'lastname', 'birthdate', 'gender',
                        'birthdate-before','birthdate-after'), $terms['_domain']),
                    'total' => $total,
                    'start' => $start,
                    'search_name' => self::NAME,
                    'preview' => $options[SearchInterface::SEARCH_PREVIEW_OPTION],
                    'paginator' => $paginator,
                    'title' => "Similar persons"
                ));
        } elseif ($format === 'json') {
            return [
                'results' => $this->search($terms, $start, $limit, \array_merge($options, [ 'simplify' => true ])),
                'pagination' => [
                    'more' => $paginator->hasNextPage()
                ]
            ];
        }
    }
    
    
    /**
     *
     * @param string $pattern
     * @param int $start
     * @param int $limit
     * @param array $options
     * @return Person[]
     */
    protected function search(array $terms, $start, $limit, array $options = array())
    {
        $qb = $this->createQuery($terms, 'search');
        
        if ($options['simplify'] ?? false) {
            $qb->select(
                'p.id',
                $qb->expr()->concat(
                    'p.firstName',
                    $qb->expr()->literal(' '),
                    'p.lastName'
                ).'AS text'
            );
        } else {
            $qb->select('p');
        }
        
        $qb
            ->setMaxResults($limit)
            ->setFirstResult($start);
        
        //order by firstname, lastname
        
        $qb
            ->orderBy('p.firstName')
            ->addOrderBy('p.lastName');
        
        if ($options['simplify'] ?? false) {
            return $qb->getQuery()->getResult(Query::HYDRATE_ARRAY);
        } else {
            return $qb->getQuery()->getResult();
        }
    }
    
    
    protected function count(array $terms)
    {
        $qb = $this->createQuery($terms);

        
        $qb->select('COUNT(p.id)');
        
        return $qb->getQuery()->getSingleScalarResult();
    }
    
    
    private $_cacheQuery = array();
    
    /**
     *
     * @param array $terms
     * @return \Doctrine\ORM\QueryBuilder
     */
    protected function createQuery(array $terms)
    {
        //get from cache
        $cacheKey = md5(serialize($terms));
        if (array_key_exists($cacheKey, $this->_cacheQuery)) {
            return clone $this->_cacheQuery[$cacheKey];
        }
        
        $qb = $this->em->createQueryBuilder();
        
        $qb->from('ChillPersonBundle:Person', 'p');
        
        if ($terms['_default'] !== '') {
            $grams = explode(' ', $terms['_default']);
            
            foreach($grams as $key => $gram) {
                $qb->andWhere(
                    'SIMILARITY(p.fullnameCanonical, UNACCENT(LOWER(:default_'.$key.'))) >= 0.15')
                    ->setParameter('default_'.$key, '%'.$gram.'%');
            }
        }
        
        //restraint center for security
        $reachableCenters = $this->helper->getReachableCenters($this->user,
            new Role('CHILL_PERSON_SEE'));
        $qb->andWhere($qb->expr()
            ->in('p.center', ':centers'))
            ->setParameter('centers', $reachableCenters)
        ;
        
        $this->_cacheQuery[$cacheKey] = $qb;
        
        return clone $qb;
    }
    
}