<?php

/*
 * Chill is a software for social workers
 *
 * Copyright (C) 2015, Champs Libres Cooperative SCRLFS,
 * <http://www.champs-libres.coop>, <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\Controller;

use Chill\PersonBundle\Privacy\PrivacyEvent;
use Psr\Log\LoggerInterface;
use Chill\PersonBundle\Entity\Person;
use Chill\PersonBundle\Form\PersonType;
use Chill\PersonBundle\Form\CreationPersonType;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\EventDispatcher\EventDispatcherInterface;
use Symfony\Component\Form\Extension\Core\Type\ButtonType;
use Symfony\Component\Form\Extension\Core\Type\SubmitType;
use Symfony\Component\Form\Form;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpFoundation\Session\SessionInterface;
use Symfony\Component\Security\Core\Role\Role;
use Chill\PersonBundle\Security\Authorization\PersonVoter;
use Chill\PersonBundle\Search\SimilarPersonMatcher;
use Symfony\Component\Security\Core\Security;
use Symfony\Component\Translation\TranslatorInterface;
use Chill\MainBundle\Search\SearchProvider;
use Chill\PersonBundle\Repository\PersonRepository;
use Chill\PersonBundle\Config\ConfigPersonAltNamesHelper;
use Chill\PersonBundle\Repository\PersonNotDuplicateRepository;
use Symfony\Component\Validator\Validator\ValidatorInterface;
use Doctrine\ORM\EntityManagerInterface;
use Symfony\Component\Routing\Annotation\Route;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\ParamConverter;

final class PersonController extends AbstractController
{
    /**
     * @var SimilarPersonMatcher
     */
    protected $similarPersonMatcher;

    /**
     * @var TranslatorInterface
     */
    protected $translator;

    /**
     * @var EventDispatcherInterface
     */
    protected $eventDispatcher;

    /**
     * @var PersonRepository;
     */
    protected $personRepository;

    /**
     * @var ConfigPersonAltNamesHelper
     */
    protected $configPersonAltNameHelper;

    /**
     * @var EntityManagerInterface
     */
    private $em;

    /**
     * @var \Psr\Log\LoggerInterface
     */
    private $logger;

    /**
     * @var ValidatorInterface
     */
    private $validator;

    public function __construct(
        SimilarPersonMatcher $similarPersonMatcher,
        TranslatorInterface $translator,
        EventDispatcherInterface $eventDispatcher,
        PersonRepository $personRepository,
        ConfigPersonAltNamesHelper $configPersonAltNameHelper,
        LoggerInterface $logger,
        ValidatorInterface $validator,
        EntityManagerInterface $em,
        Security $security
    ) {
        $this->similarPersonMatcher = $similarPersonMatcher;
        $this->translator = $translator;
        $this->eventDispatcher = $eventDispatcher;
        $this->configPersonAltNameHelper = $configPersonAltNameHelper;
        $this->personRepository = $personRepository;
        $this->logger = $logger;
        $this->validator = $validator;
        $this->em = $em;
        $this->security = $security;
  }

    public function getCFGroup()
    {
        $cFGroup = null;

        $cFDefaultGroup  = $this->em->getRepository("ChillCustomFieldsBundle:CustomFieldsDefaultGroup")
            ->findOneByEntity("Chill\PersonBundle\Entity\Person");

        if($cFDefaultGroup) {
            $cFGroup = $cFDefaultGroup->getCustomFieldsGroup();
        }

        return $cFGroup;
    }

    public function viewAction($person_id)
    {
        $person = $this->_getPerson($person_id);

        if ($person === null) {
            throw $this->createNotFoundException("Person with id $person_id not"
                    . " found on this server");
        }

        $this->denyAccessUnlessGranted('CHILL_PERSON_SEE', $person,
                "You are not allowed to see this person.");

        $event = new PrivacyEvent($person);
        $this->eventDispatcher->dispatch(PrivacyEvent::PERSON_PRIVACY_EVENT, $event);

        return $this->render('ChillPersonBundle:Person:view.html.twig',
            array(
                "person" => $person,
                "cFGroup" => $this->getCFGroup(),
                "alt_names" => $this->configPersonAltNameHelper->getChoices(),
            ));
    }

    public function editAction($person_id)
    {
        $person = $this->_getPerson($person_id);

        if ($person === null) {
            return $this->createNotFoundException();
        }

        $this->denyAccessUnlessGranted('CHILL_PERSON_UPDATE', $person,
                'You are not allowed to edit this person');

        $form = $this->createForm(PersonType::class, $person,
            array(
                "action" => $this->generateUrl('chill_person_general_update',
                    array("person_id" => $person_id)),
                "cFGroup" => $this->getCFGroup()
            )
        );

        return $this->render('ChillPersonBundle:Person:edit.html.twig',
            array('person' => $person, 'form' => $form->createView()));
    }

    public function updateAction($person_id, Request $request)
    {
        $person = $this->_getPerson($person_id);

        if ($person === null) {
            return $this->createNotFoundException();
        }

        $this->denyAccessUnlessGranted('CHILL_PERSON_UPDATE', $person,
                'You are not allowed to edit this person');

        $form = $this->createForm(PersonType::class, $person,
            array("cFGroup" => $this->getCFGroup()));

        if ($request->getMethod() === 'POST') {
            $form->handleRequest($request);

            if ( ! $form->isValid() ) {
                $this->get('session')
                        ->getFlashBag()->add('error', $this->translator
                            ->trans('This form contains errors'));

                return $this->render('ChillPersonBundle:Person:edit.html.twig',
                        array('person' => $person,
                            'form' => $form->createView()));
            }

            $this->get('session')->getFlashBag()
                    ->add('success',
                            $this->get('translator')
                            ->trans('The person data has been updated')
                            );

            $this->em->flush();

            $url = $this->generateUrl('chill_person_view', array(
                'person_id' => $person->getId()
            ));

            return $this->redirect($url);
        }
    }

    /**
     * Method for creating a new person
     *
     *The controller register data from a previous post on the form, and
     * register it in the session.
     *
     * The next post compare the data with previous one and, if yes, show a
     * review page if there are "alternate persons".
     *
     * @param Request $request
     * @return \Symfony\Component\HttpFoundation\RedirectResponse|Response
     */
    public function newAction(Request $request)
    {
        $defaultCenter = $this->security
                        ->getUser()
                        ->getGroupCenters()[0]
                        ->getCenter();

        $person = (new Person(new \DateTime('now')))
                ->setCenter($defaultCenter);

        $form = $this->createForm(CreationPersonType::class, $person, [
            'validation_groups' => ['create']
        ])->add('editPerson', SubmitType::class, [
            'label' => 'Add the person'
        ])->add('createPeriod', SubmitType::class, [
            'label' => 'Add the person and create an accompanying period'
        ]);

        $form->handleRequest($request);

        if ($request->getMethod() === Request::METHOD_GET) {
            $this->lastPostDataReset();
        } elseif ($request->getMethod() === Request::METHOD_POST
            && $form->isValid()) {

            $alternatePersons = $this->similarPersonMatcher
                ->matchPerson($person);

            if (
                FALSE === $this->isLastPostDataChanges($form, $request, true)
                ||
                count($alternatePersons) === 0
            ) {
                $this->em->persist($person);

                $this->em->flush();
                $this->lastPostDataReset();

                if ($form->get('createPeriod')->isClicked()) {
                    return $this->redirectToRoute('chill_person_accompanying_course_new', [
                        'person_id' => [ $person->getId() ]
                    ]);
                }

                return $this->redirectToRoute('chill_person_general_edit',
                    ['person_id' => $person->getId()]);
            }
        } elseif ($request->getMethod() === Request::METHOD_POST && !$form->isValid()) {
            $this->addFlash('error', $this->translator->trans('This form contains errors'));
        }

        return $this->render('@ChillPerson/Person/create.html.twig',
            [
                'form' => $form->createView(),
                'alternatePersons' => $alternatePersons ?? []
            ]
        );
    }

    private function isLastPostDataChanges(Form $form, Request $request, bool $replace = false): bool
    {
        /** @var SessionInterface $session */
        $session = $this->get('session');
        if (!$session->has('last_person_data')) {
            return true;
        }

        $newPost = $this->lastPostDataBuildHash($form, $request);

        $isChanged = $newPost !== $session->get('last_person_data');

        if ($replace) {
            $session->set('last_person_data', $newPost);
        }

        return $isChanged ;
    }

    private function lastPostDataReset(): void
    {
        $this->get('session')->set('last_person_data', "");
    }

    /**
     * build the hash for posted data
     *
     * For privacy reasons, the data are hashed using sha512
     *
     * @param Form $form
     * @param Request $request
     * @return string
     */
    private function lastPostDataBuildHash(Form $form, Request $request): string
    {
        $fields = [];
        $ignoredFields = ['form_status', '_token'];

        foreach ($request->request->all()[$form->getName()] as $field => $value) {
            if (\in_array($field, $ignoredFields)) {
                continue;
            }
            $fields[$field] = \is_array($value) ?
                \implode(",", $value) : $value;
        }
        ksort($fields);

        return \hash('sha512', \implode("&", $fields));
    }

    /**
     *
     * @param \Chill\PersonBundle\Entity\Person $person
     * @return \Symfony\Component\Validator\ConstraintViolationListInterface
     */
    private function _validatePersonAndAccompanyingPeriod(Person $person)
    {
        $errors = $this->validator
            ->validate($person, null, array('creation'));

        //validate accompanying periods
        $periods = $person->getAccompanyingPeriods();

        foreach ($periods as $period) {
            $period_errors = $this->validator
                ->validate($period);

            //group errors :
            foreach($period_errors as $error) {
                $errors->add($error);
            }
        }

        return $errors;
    }

    /**
     * easy getting a person by his id
     * @return \Chill\PersonBundle\Entity\Person
     */
    private function _getPerson($id)
    {
        $person = $this->personRepository->find($id);

        return $person;
    }

    /**
     *
     * @Route(
     *      "/{_locale}/person/household/{person_id}/history",
     *      name="chill_person_household_person_history",
     *      methods={"GET", "POST"}
     *  )
     *  @ParamConverter("person", options={"id" = "person_id"})
     */
    public function householdHistoryByPerson(Request $request, Person $person): Response
    {
        $this->denyAccessUnlessGranted('CHILL_PERSON_SEE', $person,
                "You are not allowed to see this person.");

        $event = new PrivacyEvent($person);
        $this->eventDispatcher->dispatch(PrivacyEvent::PERSON_PRIVACY_EVENT, $event);

        return $this->render(
            '@ChillPerson/Person/household_history.html.twig',
            [
                'person' => $person
            ]
        );
    }
}