<?php

declare(strict_types=1);

namespace App\Controller;

use App\Entity\Import;
use App\Entity\User;
use App\Message\ProcessImportMessage;
use App\Repository\ImportRepository;
use Doctrine\ORM\EntityManagerInterface;
use League\Flysystem\FilesystemOperator;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\JsonResponse;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Messenger\MessageBusInterface;
use Symfony\Component\Routing\Attribute\Route;
use Symfony\Component\Security\Http\Attribute\IsGranted;

class ImportController extends AbstractController
{
    #[Route('/api/imports/latest', methods: ['GET'])]
    #[IsGranted('ROLE_USER')]
    public function latest(ImportRepository $importRepository): JsonResponse
    {
        /** @var User $user */
        $user = $this->getUser();

        $import = $importRepository->findLatestForUser($user);

        if (!$import) {
            return $this->json(null);
        }

        return $this->json([
            'id' => $import->getId(),
            'status' => $import->getStatus(),
            'totalFilms' => $import->getTotalFilms(),
            'processedFilms' => $import->getProcessedFilms(),
            'failedFilms' => $import->getFailedFilms(),
        ]);
    }

    #[Route('/api/imports', methods: ['POST'])]
    #[IsGranted('ROLE_USER')]
    public function create(
        Request $request,
        FilesystemOperator $defaultStorage,
        EntityManagerInterface $em,
        ImportRepository $importRepository,
        MessageBusInterface $bus,
    ): JsonResponse {
        /** @var User $user */
        $user = $this->getUser();

        if ($importRepository->hasActiveImport($user)) {
            return $this->json(['error' => 'Un import est déjà en cours.'], Response::HTTP_CONFLICT);
        }

        $file = $request->files->get('file');

        if (!$file) {
            return $this->json(['error' => 'No file provided.'], Response::HTTP_UNPROCESSABLE_ENTITY);
        }

        if ('csv' !== $file->getClientOriginalExtension()) {
            return $this->json(['error' => 'Only CSV files are accepted.'], Response::HTTP_UNPROCESSABLE_ENTITY);
        }

        if ($file->getSize() > 5 * 1024 * 1024) {
            return $this->json(['error' => 'File too large (max 5 MB).'], Response::HTTP_UNPROCESSABLE_ENTITY);
        }

        $import = new Import();
        $import->setUser($user);
        $import->setFilePath('pending');

        $em->persist($import);
        $em->flush();

        try {
            $filePath = sprintf('imports/%d/%d.csv', $user->getId(), $import->getId());
            $defaultStorage->write($filePath, file_get_contents($file->getPathname()));

            $import->setFilePath($filePath);
            $em->flush();

            $bus->dispatch(new ProcessImportMessage($import->getId()));
        } catch (\Throwable) {
            $import->setStatus(Import::STATUS_FAILED);
            $em->flush();

            return $this->json(['error' => 'An error occurred while starting the import.'], Response::HTTP_INTERNAL_SERVER_ERROR);
        }

        return $this->json([
            'id' => $import->getId(),
            'status' => $import->getStatus(),
        ], Response::HTTP_CREATED);
    }
}