/**
* Export metadata of the Exercise in a JSON-encodable format.
*
* @param Exercise $exercise
*
* @return array
*/
private function exportMetadata(Exercise $exercise)
{
$node = $exercise->getResourceNode();
$creator = $node->getCreator();
$authorName = sprintf('%s %s', $creator->getFirstName(), $creator->getLastName());
// Accessibility dates
$startDate = $node->getAccessibleFrom() ? $node->getAccessibleFrom()->format('Y-m-d\\TH:i:s') : null;
$endDate = $node->getAccessibleUntil() ? $node->getAccessibleUntil()->format('Y-m-d\\TH:i:s') : null;
$correctionDate = $exercise->getDateCorrection() ? $exercise->getDateCorrection()->format('Y-m-d\\TH:i:s') : null;
return ['authors' => [['name' => $authorName]], 'created' => $node->getCreationDate()->format('Y-m-d\\TH:i:s'), 'title' => $node->getName(), 'description' => $exercise->getDescription(), 'type' => $exercise->getType(), 'pick' => $exercise->getPickSteps(), 'random' => $exercise->getShuffle(), 'keepSteps' => $exercise->getKeepSteps(), 'maxAttempts' => $exercise->getMaxAttempts(), 'lockAttempt' => $exercise->getLockAttempt(), 'dispButtonInterrupt' => $exercise->getDispButtonInterrupt(), 'metadataVisible' => $exercise->isMetadataVisible(), 'statistics' => $exercise->hasStatistics(), 'anonymous' => $exercise->getAnonymous(), 'duration' => $exercise->getDuration(), 'markMode' => $exercise->getMarkMode(), 'correctionMode' => $exercise->getCorrectionMode(), 'correctionDate' => $correctionDate, 'startDate' => $startDate, 'endDate' => $endDate, 'published' => $node->isPublished(), 'publishedOnce' => $exercise->wasPublishedOnce(), 'minimalCorrection' => $exercise->isMinimalCorrection()];
}