<?php

namespace Chill\DocGeneratorBundle\Service\Messenger;

use Chill\DocGeneratorBundle\Repository\DocGeneratorTemplateRepository;
use Chill\DocGeneratorBundle\Service\Generator\Generator;
use Chill\DocStoreBundle\Entity\StoredObject;
use Chill\DocStoreBundle\Repository\StoredObjectRepository;
use Chill\MainBundle\Repository\UserRepositoryInterface;
use Doctrine\ORM\EntityManagerInterface;
use Psr\Log\LoggerInterface;
use Symfony\Component\Messenger\Exception\UnrecoverableMessageHandlingException;
use Symfony\Component\Messenger\Handler\MessageHandlerInterface;

/**
 * Handle the request of document generation
 */
class RequestGenerationHandler implements MessageHandlerInterface
{
    private StoredObjectRepository $storedObjectRepository;

    private DocGeneratorTemplateRepository $docGeneratorTemplateRepository;

    private EntityManagerInterface $entityManager;

    private Generator $generator;

    private LoggerInterface $logger;

    private UserRepositoryInterface $userRepository;

    public const AUTHORIZED_TRIALS = 5;

    private const LOG_PREFIX = '[docgen message handler] ';

    public function __construct(
        DocGeneratorTemplateRepository $docGeneratorTemplateRepository,
        EntityManagerInterface $entityManager,
        Generator $generator,
        LoggerInterface $logger,
        StoredObjectRepository $storedObjectRepository,
        UserRepositoryInterface $userRepository
    ) {
        $this->docGeneratorTemplateRepository = $docGeneratorTemplateRepository;
        $this->entityManager = $entityManager;
        $this->generator = $generator;
        $this->logger = $logger;
        $this->storedObjectRepository = $storedObjectRepository;
        $this->userRepository = $userRepository;
    }

    public function __invoke(RequestGenerationMessage $message)
    {
        if (null === $template = $this->docGeneratorTemplateRepository->find($message->getTemplateId())) {
            throw new \RuntimeException('template not found: ' . $message->getTemplateId());
        }

        if (null === $destinationStoredObject = $this->storedObjectRepository->find($message->getDestinationStoredObjectId())) {
            throw new \RuntimeException('destination stored object not found : ' . $message->getDestinationStoredObjectId());
        }

        if ($destinationStoredObject->getGenerationTrialsCounter() >= self::AUTHORIZED_TRIALS) {
            throw new UnrecoverableMessageHandlingException('maximum number of retry reached');
        }

        $creator = $this->userRepository->find($message->getCreatorId());

        $destinationStoredObject->addGenerationTrial();
        $this->entityManager->createQuery('UPDATE '.StoredObject::class.' s SET s.generationTrialsCounter = s.generationTrialsCounter + 1 WHERE s.id = :id')
            ->setParameter('id', $destinationStoredObject->getId())
            ->execute();

        $this->generator->generateDocFromTemplate(
            $template,
            $message->getEntityId(),
            $message->getContextGenerationData(),
            $destinationStoredObject,
            false,
            null,
            $creator
        );

        $this->logger->info(self::LOG_PREFIX.'Request generation finished', [
            'template_id' => $message->getTemplateId(),
            'destination_stored_object' => $message->getDestinationStoredObjectId(),
            'duration_int' => (new \DateTimeImmutable('now'))->getTimestamp() - $message->getCreatedAt()->getTimestamp(),
        ]);
    }
}