<?php

/*
 * Copyright (C) 2015 Champs-Libres Coopérative <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\PersonBundle\Timeline;

use Chill\MainBundle\Timeline\TimelineProviderInterface;
use Doctrine\ORM\EntityManager;
use Chill\PersonBundle\Entity\AccompanyingPeriod;
use Chill\PersonBundle\Entity\Person;
use Chill\PersonBundle\Entity\AccompanyingPeriodParticipation;
use Chill\MainBundle\Entity\Center;
use Chill\PersonBundle\Security\Authorization\PersonVoter;
use Symfony\Component\Security\Core\Security;
use Chill\MainBundle\Security\Authorization\AuthorizationHelper;
use Chill\MainBundle\Timeline\TimelineSingleQuery;

/**
 * Provide method to build timeline for accompanying periods
 * 
 * This class is resued by TimelineAccompanyingPeriodOpening (for opening)
 * and TimelineAccompanyingPeriodClosing (for closing)
 *
 */
abstract class AbstractTimelineAccompanyingPeriod implements TimelineProviderInterface
{
    protected EntityManager $em;

    private Security $security;

    private AuthorizationHelper $authorizationHelper;

    private const SUPPORTED_CONTEXTS = [ 'person', 'center' ];
    
    public function __construct(EntityManager $em, Security $security, AuthorizationHelper $authorizationHelper)
    {
        $this->em = $em;
        $this->security = $security;
        $this->authorizationHelper = $authorizationHelper;
    }

    /**
     * 
     * {@inheritDoc}
     */
    public function getEntities(array $ids)
    {
        $periods = $this->em
                ->getRepository('ChillPersonBundle:AccompanyingPeriod')
                ->findBy(array('id' => $ids));
        
        //set results in an associative array with id as indexes
        $results = array();
        foreach($periods as $period) {
            $results[$period->getId()] = $period;
        }
        
        return $results;
    }

    /**
     * prepare fetchQuery without `WHERE` and `TYPE` clause
     * 
     * @param string $context
     * @param array $args
     * @return array
     * @throws \LogicException
     */
    protected function basicFetchQuery($context, array $args)
    {
        if (FALSE === \in_array($context, self::SUPPORTED_CONTEXTS)) {
            throw new \LogicException('TimelineAccompanyingPeriod is not able '
                    . 'to render context '.$context);
        }
        
        $metadata = $this->em
                ->getClassMetadata(AccompanyingPeriod::class)
                ;
        [$where, $parameters] = $this->buildWhereClause($context, $args);

        return TimelineSingleQuery::fromArray([
            'id' => "{$metadata->getTableName()}.{$metadata->getColumnName('id')}",
            'FROM' => $this->buildFromClause($context),
            'WHERE' => $where,
            'parameters' => $parameters
        ]);
    }

    private function buildFromClause($context)
    {
        $period = $this->em->getClassMetadata(AccompanyingPeriod::class);
        $participation = $this->em->getClassMetadata(AccompanyingPeriodParticipation::class);
        $person = $this->em->getClassMetadata(Person::class);
        $join = $participation->getAssociationMapping('accompanyingPeriod')['joinColumns'][0];
        $joinPerson = $participation->getAssociationMapping('person')['joinColumns'][0];

        if ($context === 'person') {
            return "{$period->getTableName()} ".
                "JOIN {$participation->getTableName()} ".
                "ON {$participation->getTableName()}.{$join['name']} = ".
                "{$period->getTableName()}.{$join['referencedColumnName']}";
        } else {
            return "{$period->getTableName()} ".
                "JOIN {$participation->getTableName()} ".
                "ON {$participation->getTableName()}.{$join['name']} = ".
                "{$period->getTableName()}.{$join['referencedColumnName']} ".
                "JOIN {$person->getTableName()} ".
                "ON {$participation->getTableName()}.{$joinPerson['name']} = ".
                "{$person->getTableName()}.{$joinPerson['referencedColumnName']}"
                ;
        }

    }

    protected function buildWhereClause($context, array $args): array
    {
        $participation = $this->em->getClassMetadata(AccompanyingPeriodParticipation::class);
        $join = $participation->getAssociationMapping('person')['joinColumns'][0];
        $person = $this->em->getClassMetadata(Person::class);
        $joinCenter = $person->getAssociationMapping('center')['joinColumns'][0];

        if ($context === 'center') {
            $allowedCenters = $this->authorizationHelper->filterReachableCenters($this->security->getUser(), $args['centers'], PersonVoter::SEE);
            $params = [];
            $questionMarks = [];
            $query = "{$person->getTableName()}.{$joinCenter['name']} IN (";
            foreach ($allowedCenters as $c) {
                $questionMarks[] = '?';
                $params[] = $c->getId();
            }
            $query .= \implode(", ", $questionMarks).")";

            return [$query, $params];
        } elseif ($context === 'person') {
            return [ "{$participation->getTableName()}.{$join['name']} = ?", [ $args['person']->getId() ]];
        }

        throw new \LogicException("this context is not supported: $context");
    }

    /**
     * return the expected response for TimelineProviderInterface::getEntityTemplate
     * 
     * @param string $template the template for rendering
     * @param mixed $entity
     * @param string $context
     * @param array $args
     * @return array
     */
    protected function getBasicEntityTemplate($template, $entity, $context, array $args)
    {
        return array(
            'template' => $template,
            'template_data' => ['period' => $entity, 'context' => $context]
        );
    }
}