function rollback($slug, $timestamp, Request $request, Application $app)
 {
     if (!$this->build($slug, $request, $app)) {
         $app->abort(404, "Event does not exist.");
     }
     if ($this->parameters['event']->getIsImported()) {
         die("No");
         // TODO
     }
     $ehr = new EventHistoryRepository();
     $this->parameters['eventHistory'] = $ehr->loadByEventAndtimeStamp($this->parameters['event'], $timestamp);
     if (!$this->parameters['eventHistory']) {
         $app->abort(404, "Event History does not exist.");
     }
     $newEventState = clone $this->parameters['event'];
     $newEventState->setFromHistory($this->parameters['eventHistory']);
     $form = $app['form.factory']->create(new EventEditForm($app['currentSite'], $app['currentTimeZone'], $app), $newEventState);
     if ('POST' == $request->getMethod()) {
         $form->bind($request);
         if ($form->isValid()) {
             // Because to undelete or uncancel something, you rollback to a valid state, when you rollback you must set these.
             $newEventState->setIsCancelled(false);
             $newEventState->setIsDeleted(false);
             $eventEditMetaData = new EventEditMetaDataModel();
             $eventEditMetaData->setUserAccount($app['currentUser']);
             if ($form->has('edit_comment')) {
                 $eventEditMetaData->setEditComment($form->get('edit_comment')->getData());
             }
             $eventEditMetaData->setRevertedFromHistoryCreatedAt($this->parameters['eventHistory']->getCreatedAt());
             $eventEditMetaData->setFromRequest($request);
             $eventRepository = new EventRepository();
             $eventRepository->editWithMetaData($newEventState, $eventEditMetaData);
             return $app->redirect("/event/" . $this->parameters['event']->getSlugForURL());
         }
     }
     $this->parameters['form'] = $form->createView();
     return $app['twig']->render('site/event/rollback.html.twig', $this->parameters);
 }
 function newEventDraft($draftslug, $stepid, Request $request, Application $app)
 {
     if (!$this->buildDraft($draftslug, $request, $app)) {
         return $app->abort(404);
     }
     $redirectToStep = $this->buildSteps($stepid, $request, $app);
     if ($redirectToStep) {
         return $app->redirect("/event/new/" . $this->parameters['draft']->getSlug() . "/" . $redirectToStep);
     }
     if ($this->parameters['currentStep']->getStepID() == 'preview') {
         if ($request->request->get('action') == 'CREATE' && $request->request->get('CSFRToken') == $app['websession']->getCSFRToken()) {
             //////////////////////////////////////// Actually Create Event
             $event = new EventModel();
             $event->setSiteId($app['currentSite']->getId());
             foreach ($this->parameters['steps'] as $step) {
                 $step->addDataToEventBeforeSave($event);
             }
             $eventEditMetaData = new EventEditMetaDataModel();
             $eventEditMetaData->setUserAccount($app['currentUser']);
             $eventEditMetaData->setCreatedFromNewEventDraftID($this->parameters['draft']->getId());
             if ($request->request->get('edit_comment')) {
                 $eventEditMetaData->setEditComment($request->request->get('edit_comment'));
             }
             $repo = new EventRepository();
             $repo->createWithMetaData($event, $app['currentSite'], $eventEditMetaData);
             if ($app['config']->logFileParseDateTimeRange && $this->parameters['draft']->hasDetailsValue('event.start_end_freetext.done') == 'yes') {
                 $parseStart = $this->parameters['draft']->getDetailsValueAsDateTime('event.start_end_freetext.start');
                 $parseEnd = $this->parameters['draft']->getDetailsValueAsDateTime('event.start_end_freetext.end');
                 $success = $parseStart->getTimestamp() == $event->getStartAt()->getTimestamp() && $parseEnd->getTimestamp() == $event->getEndAt()->getTimestamp();
                 $handle = fopen($app['config']->logFileParseDateTimeRange, "a");
                 $now = \TimeSource::getDateTime();
                 fputcsv($handle, array('Site', $app['currentSite']->getId(), $app['currentSite']->getSlug(), 'Event', $event->getSlug(), 'Now', $now->format("c"), 'Wanted Timezone', $event->getTimezone(), 'Wanted Start UTC', $event->getStartAtInUTC()->format("c"), 'Wanted End UTC', $event->getEndAtInUTC()->format("c"), 'Typed', $this->parameters['draft']->getDetailsValue('event.start_end_freetext.text'), 'Got Start UTC', $parseStart->format("c"), 'Got End UTC', $parseEnd->format("c"), $success ? 'SUCCESS' : 'FAIL'));
                 fclose($handle);
             }
             $app['flashmessages']->addMessage("Thanks! The event has been created.");
             return $app->redirect('/event/' . $event->getSlugForUrl());
         } else {
             //////////////////////////////////////// Show Final Preview Screen
             $this->parameters['stepsUI'] = (new StepsUI($this->parameters['steps'], $this->parameters['currentStep']))->getSteps();
             $this->parameters = array_merge($this->parameters, $this->parameters['currentStep']->onThisStepSetUpPageView());
             return $app['twig']->render('site/eventnew/eventDraft.preview.html.twig', $this->parameters);
         }
     } else {
         //////////////////////////////////////// Info needed! Show this step
         $this->parameters = array_merge($this->parameters, $this->parameters['currentStep']->onThisStepSetUpPage());
         if ($this->parameters['currentStep']->onThisStepProcessPage() && 'POST' == $request->getMethod()) {
             $repo = new NewEventDraftRepository();
             $repo->saveProgress($this->parameters['draft']);
             if ($this->parameters['currentStep']->getIsAllInformationGathered()) {
                 return $app->redirect('/event/new/' . $this->parameters['draft']->getSlug() . "/" . $this->parameters['nextStepID']);
             } else {
                 // we just have some info, but not all for this step. Stay on this step.
                 return $app->redirect('/event/new/' . $this->parameters['draft']->getSlug() . "/" . $this->parameters['currentStep']->getStepID());
             }
         }
         $this->parameters = array_merge($this->parameters, $this->parameters['currentStep']->onThisStepSetUpPageView());
         $this->parameters['stepsUI'] = (new StepsUI($this->parameters['steps'], $this->parameters['currentStep']))->getSteps();
         return $app['twig']->render('site/eventnew/eventDraft.html.twig', $this->parameters);
     }
 }