<?php

declare(strict_types=1);

namespace App\State;

use ApiPlatform\Metadata\Operation;
use ApiPlatform\State\ProcessorInterface;
use App\Entity\ClientTicket;
use App\Service\NotificationService;
use DateTimeImmutable;
use Doctrine\ORM\EntityManagerInterface;
use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;

/**
 * @implements ProcessorInterface<ClientTicket, ClientTicket>
 */
final readonly class ClientTicketStatusProcessor implements ProcessorInterface
{
    private const FORBIDDEN_TRANSITIONS = [
        'done'     => ['new'],
        'rejected' => ['new'],
    ];

    public function __construct(
        private EntityManagerInterface $entityManager,
        private NotificationService $notificationService,
    ) {}

    public function process(mixed $data, Operation $operation, array $uriVariables = [], array $context = []): ClientTicket
    {
        assert($data instanceof ClientTicket);

        $originalData = $context['previous_data'] ?? null;
        if ($originalData instanceof ClientTicket) {
            $oldStatus = $originalData->getStatus();
            $newStatus = $data->getStatus();

            if ($oldStatus !== $newStatus) {
                $forbidden = self::FORBIDDEN_TRANSITIONS[$oldStatus] ?? [];
                if (in_array($newStatus, $forbidden, true)) {
                    throw new BadRequestHttpException(sprintf('Transition from "%s" to "%s" is not allowed.', $oldStatus, $newStatus));
                }

                if ('rejected' === $newStatus && (null === $data->getStatusComment() || '' === trim($data->getStatusComment()))) {
                    throw new BadRequestHttpException('A comment is required when rejecting a ticket.');
                }
            }
        }

        $data->setUpdatedAt(new DateTimeImmutable());

        $this->entityManager->persist($data);
        $this->entityManager->flush();

        $this->notificationService->createForStatusChange($data);

        return $data;
    }
}