<?php

/*
 * Chill is a software for social workers
 *
 * Copyright (C) 2014-2019, 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\EventBundle\Controller;

use Chill\EventBundle\Entity\Participation;
use Chill\EventBundle\Form\Type\PickEventType;
use Chill\MainBundle\Pagination\PaginatorFactory;
use PhpOffice\PhpSpreadsheet\Spreadsheet;
use PhpOffice\PhpSpreadsheet\Writer\Csv;
use PhpOffice\PhpSpreadsheet\Writer\Ods;
use PhpOffice\PhpSpreadsheet\Writer\Xlsx;
use Symfony\Component\Form\Extension\Core\Type\ChoiceType;
use Symfony\Component\HttpFoundation\StreamedResponse;
use Chill\EventBundle\Security\Authorization\EventVoter;
use Chill\MainBundle\Security\Authorization\AuthorizationHelper;
use Chill\PersonBundle\Entity\Person;
use Chill\PersonBundle\Privacy\PrivacyEvent;
use Symfony\Component\EventDispatcher\EventDispatcherInterface;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Chill\PersonBundle\Form\Type\PickPersonType;
use Chill\EventBundle\Entity\Event;
use Chill\EventBundle\Form\EventType;
use Symfony\Component\Security\Core\Role\Role;
use Symfony\Component\Form\Extension\Core\Type\FormType;
use Symfony\Component\Form\Extension\Core\Type\SubmitType;
use Symfony\Component\Form\Extension\Core\Type\HiddenType;
use Chill\MainBundle\Entity\Center;
use Symfony\Bridge\Doctrine\Form\Type\EntityType;
use Symfony\Component\Form\FormFactoryInterface;
use Symfony\Component\Translation\TranslatorInterface;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\ParamConverter;


/**
 * Event controller.
 *
 */
class EventController extends Controller
{
    /**
     * @var EventDispatcherInterface
     */
    protected $eventDispatcher;
    
    /**
     * @var AuthorizationHelper
     */
    protected $authorizationHelper;
    
    /**
     * @var FormFactoryInterface
     */
    protected $formFactoryInterface;
    
    /**
     * @var TranslatorInterface
     */
    protected $translator;
    
    /**
     * @var PaginatorFactory
     */
    protected $paginator;
    
    /**
     * EventController constructor.
     *
     * @param EventDispatcherInterface $eventDispatcher
     * @param AuthorizationHelper $authorizationHelper
     * @param FormFactoryInterface $formFactoryInterface
     * @param TranslatorInterface $translator
     * @param PaginatorFactory $paginator
     */
    public function __construct(
        EventDispatcherInterface $eventDispatcher,
        AuthorizationHelper $authorizationHelper,
        FormFactoryInterface $formFactoryInterface,
        TranslatorInterface $translator,
        PaginatorFactory $paginator
    )
    {
        $this->eventDispatcher = $eventDispatcher;
        $this->authorizationHelper = $authorizationHelper;
        $this->formFactoryInterface = $formFactoryInterface;
        $this->translator = $translator;
        $this->paginator = $paginator;
    }
    
    
    public function mostRecentIndexAction()
    {
        return $this->redirectToRoute('chill_main_search', array(
            'q' => '@event'
        ));
    }

   
    /**
     * First step of new Event form
     */
    public function newPickCenterAction()
    {
        $role = new Role('CHILL_EVENT_CREATE');

        /**
         * @var Center $centers
         */
        $centers = $this->authorizationHelper->getReachableCenters($this->getUser(), $role);
        
        if (count($centers) === 1)
        {
            return $this->redirectToRoute('chill_event__event_new', array(
                'center_id' => $centers[0]->getId()
            ));
        }
        
        $form = $this->formFactoryInterface
            ->createNamedBuilder(null, FormType::class, null, array(
                'csrf_protection' => false
            ))
            ->setMethod('GET')
            ->setAction(
                $this->generateUrl('chill_event__event_new'))
            ->add('center_id', EntityType::class, array(
                'class' => Center::class,
                'choices' => $centers,
                'placeholder' => '',
                'label' => 'To which centre should the event be associated ?'
            ))
            ->add('submit', SubmitType::class, array(
                'label' => 'Next step'
            ))
            ->getForm();

        return $this->render('ChillEventBundle:Event:newPickCenter.html.twig', array(
            'form' => $form->createView()
        ));

    }
    
    /**
     * Creates a form to create a Event entity.
     *
     * @param Event $entity The entity
     * @return \Symfony\Component\Form\FormInterface
     */
    private function createCreateForm(Event $entity)
    {
        $form = $this->createForm(EventType::class, $entity, array(
            'method' => 'POST',
            'center' => $entity->getCenter(),
            'role'   => new Role('CHILL_EVENT_CREATE')
        ));
        
        $form->add('submit', SubmitType::class, array('label' => 'Create'));
        
        return $form;
    }
    
    /**
     * Displays a form to create a new Event entity.
     * @param Center $center
     * @param Request $request
     * @return \Symfony\Component\HttpFoundation\Response
     */
    public function newAction(Center $center = null, Request $request)
    {
        if ($center === null)
        {
            $center_id = $request->query->get('center_id');
            $center = $this->getDoctrine()->getRepository(Center::class)->find($center_id);
        }
        
        $entity = new Event();
        $entity->setCenter($center);
        
        $form = $this->createCreateForm($entity);
        $form->handleRequest($request);
    
        if ($form->isSubmitted() && $form->isValid())
        {
            $em = $this->getDoctrine()->getManager();
            $em->persist($entity);
            $em->flush();
        
            $this->addFlash('success', $this->get('translator')
                ->trans('The event was created'));
        
            return $this->redirect($this->generateUrl('chill_event__event_show', array('event_id' => $entity->getId())));
        }

        return $this->render('ChillEventBundle:Event:new.html.twig', array(
            'entity' => $entity,
            'form'   => $form->createView(),
        ));
    }
    
    /**
     * Finds and displays a Event entity.
     *
     * @ParamConverter("event", options={"id" = "event_id"})
     * @param Event $event
     * @param Request $request
     * @return \Symfony\Component\HttpFoundation\Response
     * @throws \PhpOffice\PhpSpreadsheet\Exception
     */
    public function showAction(Event $event, Request $request)
    {
        if (!$event) {
            throw $this->createNotFoundException('Unable to find Event entity.');
        }

        $this->denyAccessUnlessGranted('CHILL_EVENT_SEE_DETAILS', $event,
              "You are not allowed to see details on this event");
        
        $addParticipationByPersonForm = $this->createAddParticipationByPersonForm($event);
    
        $exportParticipationsList = $this->exportParticipationsList($event, $request);
        
        if ($exportParticipationsList['response']) {
            return $exportParticipationsList['response'];
        }
        
        return $this->render('ChillEventBundle:Event:show.html.twig', array(
            'event'      => $event,
            'form_add_participation_by_person' => $addParticipationByPersonForm->createView(),
            'form_export' => $exportParticipationsList['form']->createView()
        ));
    }
    
    /**
     * create a form to add a participation with a person
     *
     * @param Event $event
     * @return \Symfony\Component\Form\FormInterface
     */
    protected function createAddParticipationByPersonForm(Event $event)
    {
        /* @var $builder \Symfony\Component\Form\FormBuilderInterface */
        $builder = $this
                ->get('form.factory')
                ->createNamedBuilder( 
                    null,
                    FormType::class, 
                    null,
                    array(
                        'method' => 'GET',
                        'action' => $this->generateUrl('chill_event_participation_new'),
                        'csrf_protection' => false
                    ))
                ;
        
        $builder->add('person_id', PickPersonType::class, array(
            'role' => new Role('CHILL_EVENT_CREATE'),
            'centers' => $event->getCenter()
        ));
        
        $builder->add('event_id', HiddenType::class, array(
            'data' => $event->getId()
        ));
        
        $builder->add('submit', SubmitType::class,
                array(
                    'label' => 'Add a participation'
                ));
        
        return $builder->getForm();
    }

    /**
     * Displays a form to edit an existing Event entity.
     *
     * @param $event_id
     * @return \Symfony\Component\HttpFoundation\Response
     */
    public function editAction($event_id)
    {
        $em = $this->getDoctrine()->getManager();

        $entity = $em->getRepository('ChillEventBundle:Event')->find($event_id);

        if (!$entity) {
            throw $this->createNotFoundException('Unable to find Event entity.');
        }

        $editForm = $this->createEditForm($entity);

        return $this->render('ChillEventBundle:Event:edit.html.twig', array(
            'entity'      => $entity,
            'edit_form'   => $editForm->createView(),
        ));
    }

    /**
     * Creates a form to edit a Event entity.
     *
     * @param Event $entity
     * @return \Symfony\Component\Form\FormInterface
     */
    private function createEditForm(Event $entity)
    {
        $form = $this->createForm(EventType::class, $entity, array(
            'action' => $this->generateUrl('chill_event__event_update', array('event_id' => $entity->getId())),
            'method' => 'PUT',
            'center' => $entity->getCenter(),
            'role'   => new Role('CHILL_EVENT_CREATE')
        ));

        $form->remove('center');

        $form->add('submit', SubmitType::class, array('label' => 'Update'));

        return $form;
    }
    
    /**
     * Edits an existing Event entity.
     *
     * @param Request $request
     * @param $event_id
     * @return \Symfony\Component\HttpFoundation\RedirectResponse|\Symfony\Component\HttpFoundation\Response
     */
    public function updateAction(Request $request, $event_id)
    {
        $em = $this->getDoctrine()->getManager();

        $entity = $em->getRepository('ChillEventBundle:Event')->find($event_id);

        if (!$entity) {
            throw $this->createNotFoundException('Unable to find Event entity.');
        }

        $editForm = $this->createEditForm($entity);
        $editForm->handleRequest($request);

        if ($editForm->isValid()) {
            $em->flush();
            
            $this->addFlash('success', $this->get('translator')
                    ->trans('The event was updated'));

            return $this->redirect($this->generateUrl('chill_event__event_edit', array('event_id' => $event_id)));
        }

        return $this->render('ChillEventBundle:Event:edit.html.twig', array(
            'entity'      => $entity,
            'edit_form'   => $editForm->createView(),
        ));
    }
    
    /**
     * List events subscriptions for a person
     *
     * @param $person_id
     * @return \Symfony\Component\HttpFoundation\Response
     * @throws \Doctrine\ORM\NonUniqueResultException
     */
    public function listByPersonAction($person_id)
    {
        
        $em = $this->getDoctrine()->getManager();
    
        $person = $em->getRepository('ChillPersonBundle:Person')->find($person_id);
    
        if ($person === NULL) {
            throw $this->createNotFoundException('Person not found');
        }
    
        $this->denyAccessUnlessGranted('CHILL_PERSON_SEE', $person);
        
        $reachablesCircles = $this->authorizationHelper->getReachableCircles(
            $this->getUser(),
            new Role(EventVoter::SEE),
            $person->getCenter()
        );
        
        $total = $em->getRepository('ChillEventBundle:Participation')->countByPerson($person_id);
        
        $paginator = $this->paginator->create($total);

        $participations = $em->getRepository('ChillEventBundle:Participation')->findByPersonInCircle(
            $person_id,
            $reachablesCircles,
            $paginator->getCurrentPage()->getFirstItemNumber(),
            $paginator->getItemsPerPage()
        );
            
        $privacyEvent = new PrivacyEvent($person, array(
            'element_class' => Participation::class,
            'action' => 'list'
        ));
        $this->eventDispatcher->dispatch(PrivacyEvent::PERSON_PRIVACY_EVENT, $privacyEvent);
    
        $addEventParticipationByPersonForm = $this->createAddEventParticipationByPersonForm($person);
        
        return $this->render('ChillEventBundle:Event:listByPerson.html.twig', array(
            'participations' => $participations,
            'person' => $person,
            'paginator' => $paginator,
            'form_add_event_participation_by_person' => $addEventParticipationByPersonForm->createView()
        ));
    }
    
    /**
     * create a form to add a participation with an event
     *
     * @param Person $person
     * @return \Symfony\Component\Form\FormInterface
     */
    protected function createAddEventParticipationByPersonForm(Person $person)
    {
        /* @var $builder \Symfony\Component\Form\FormBuilderInterface */
        $builder = $this
            ->get('form.factory')
            ->createNamedBuilder(
                null,
                FormType::class,
                null,
                array(
                    'method' => 'GET',
                    'action' => $this->generateUrl('chill_event_participation_new'),
                    'csrf_protection' => false
                ))
        ;
        
        $builder->add('event_id', PickEventType::class, array(
            'role' => new Role('CHILL_EVENT_CREATE'),
            'centers' => $person->getCenter()
        ));
        
        $builder->add('person_id', HiddenType::class, array(
            'data' => $person->getId()
        ));
    
        $builder->add('return_path', HiddenType::class, array(
            'data' => $this->generateUrl('chill_event__list_by_person', array(
                    'person_id' => $person->getId()
            ))
        ));
    
    
        $builder->add('submit', SubmitType::class,
            array(
                'label' => 'Subscribe an event'
            ));
        
        return $builder->getForm();
    }
    
    
    /**
     * @param Event $event
     * @param Request $request
     * @return array
     * @throws \PhpOffice\PhpSpreadsheet\Exception
     */
    protected function exportParticipationsList(Event $event, Request $request)
    {
        $form = $this->createExportByFormatForm();
        $form->handleRequest($request);
        
        if ($form->isSubmitted() && $form->isValid())
        {
            $data = $form->getData();
            $format = $data['format'];
            $filename = 'export_event'. $event->getId() .'_participations.' .$format;
            
            $spreadsheet = $this->createExportSpreadsheet($event);
            
            switch ($format) {
                case 'ods':
                    $contentType = 'application/vnd.oasis.opendocument.spreadsheet';
                    $writer = new Ods($spreadsheet);
                    break;
                case 'xlsx':
                    $contentType = 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet';
                    $writer = new Xlsx($spreadsheet);
                    break;
                case 'csv':
                    $contentType = 'text/csv';
                    $writer = new Csv($spreadsheet);
                    break;
                default:
                    return [ 'form' => $form, 'response' => null ];
            }
        
            $response = new StreamedResponse();
            $response->headers->set('Content-Type', $contentType);
            $response->headers->set('Content-Disposition', 'attachment;filename="'.$filename.'"');
            $response->setPrivate();
            $response->headers->addCacheControlDirective('no-cache', true);
            $response->headers->addCacheControlDirective('must-revalidate', true);
            $response->setCallback(function() use ($writer) {
                $writer->save('php://output');
            });
        
            return [ 'form' => $form, 'response' => $response ];
        }
        
        return [ 'form' => $form, 'response' => null ];
    }
    
    /**
     * @return \Symfony\Component\Form\FormInterface
     */
    protected function createExportByFormatForm()
    {
        $builder = $this->createFormBuilder()
            ->add('format', ChoiceType::class, [
                'choices' => [
                    'xlsx' => 'xlsx',
                    'ods' => 'ods',
                    'csv' => 'csv'
                ],
                'label' => false,
                'placeholder' => 'Select a format'
            ])
            ->add('submit', SubmitType::class, [
                'label' => 'Export'
            ]);
        
        return $builder->getForm();
    }
    
    /**
     * @param Event $event
     * @return Spreadsheet
     * @throws \PhpOffice\PhpSpreadsheet\Exception
     */
    protected function createExportSpreadsheet(Event $event)
    {
        $spreadsheet = new Spreadsheet();
        $sheet = $spreadsheet->getActiveSheet();
    
        $trans = $this->translator->getLocale();
        
        $headerValues = [
            'A1' => 'Event',
            'B1' => $event->getId(),
            'A2' => 'Date',
            'B2' => $event->getDate()->format('d-m-Y H:i'),
            'A3' => 'Name',
            'B3' => $event->getName(),
            'A4' => 'Type',
            'B4' => $event->getType()->getName()[$trans],
            'A5' => 'Circle',
            'B5' => $event->getCircle()->getName()[$trans],
            'A6' => 'Moderator',
            'B6' => $event->getModerator() ? $event->getModerator()->getUsernameCanonical() : null,
        ];
        foreach ($headerValues as $k => $value) {
            $sheet->setCellValue($k, $value);
        }
        
        $columnNames = [ 'id', 'firstname', 'lastname', 'role', 'status', 'email', 'phone', 'mobile' ];
        $columnLetter = 'A';
        foreach ($columnNames as $columnName) {
            $sheet->setCellValue($columnLetter.'8', $columnName);
            $columnLetter++;
        }
    
        $columnValues = [];
        foreach ($event->getParticipations() as $participation)
        {
            /** @var Participation $participation */
            $columnValues[] = [
                $participation->getPerson()->getId(),
                $participation->getPerson()->getFirstname(),
                $participation->getPerson()->getLastname(),
                $participation->getRole()->getName()[$trans],
                $participation->getStatus()->getName()[$trans],
                $participation->getPerson()->getEmail(),
                $participation->getPerson()->getPhoneNumber(),
                $participation->getPerson()->getMobileNumber(),
            ];
        }
        
        $i = 9;
        foreach ($columnValues as $columnValue) {
            $columnLetter = 'A';
            foreach ($columnValue as $value) {
                $sheet->setCellValue($columnLetter.$i, $value);
                $columnLetter++;
            }
            $i++;
        }
        
        return $spreadsheet;
    }
    
    /**
     * @param $event_id
     * @param Request $request
     * @return \Symfony\Component\HttpFoundation\RedirectResponse|\Symfony\Component\HttpFoundation\Response
     */
    public function deleteAction($event_id, Request $request)
    {
        $em = $this->getDoctrine()->getManager();
        $event = $em->getRepository('ChillEventBundle:Event')->findOneBy([
            'id' => $event_id
        ]);
    
        if  (! $event) {
            throw $this->createNotFoundException('Unable to find this event.');
        }
        
        /** @var array $participations */
        $participations = $event->getParticipations();
        
        $form = $this->createDeleteForm($event_id);
    
        if ($request->getMethod() === Request::METHOD_DELETE) {
            $form->handleRequest($request);
    
            if ($form->isValid()) {
        
                foreach ($participations as $participation) {
                    $em->remove($participation);
                }
                
                $em->remove($event);
                $em->flush();
    
                $this->addFlash('success', $this->get('translator')
                    ->trans("The event has been sucessfully removed")
                );
    
                return $this->redirectToRoute('chill_main_search', [
                    'name' => 'event_regular',
                    'q' => '@event'
                ]);
            }
        }
        return $this->render('ChillEventBundle:Event:confirm_delete.html.twig', [
            'event_id' => $event->getId(),
            'delete_form' => $form->createView()
        ]);
    }
    
    /**
     * @param $event_id
     * @return \Symfony\Component\Form\FormInterface
     */
    private function createDeleteForm($event_id)
    {
        return $this->createFormBuilder()
            ->setAction($this->generateUrl('chill_event__event_delete', [
                'event_id' => $event_id
            ]))
            ->setMethod('DELETE')
            ->add('submit', SubmitType::class, ['label' => 'Delete'])
            ->getForm()
            ;
    }
    
}