<?php

namespace App\Controller;

use App\Entity\CardTemplate;
use App\Entity\Company;
use App\Repository\CardTemplateRepository;
use App\Security\TenantContext;
use Doctrine\ORM\EntityManagerInterface;
use League\Flysystem\FilesystemOperator;
use Symfony\Component\DependencyInjection\Attribute\Autowire;
use Symfony\Component\HttpFoundation\File\UploadedFile;
use Symfony\Component\HttpFoundation\JsonResponse;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpFoundation\StreamedResponse;
use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
use Symfony\Component\Routing\Attribute\Route;
use Symfony\Component\Security\Http\Attribute\IsGranted;
use Symfony\Component\Uid\Uuid;

/**
 * Lädt Druck-Assets einer Firma in den (S3-)Object-Storage: Hintergrund-PDF
 * (Variable Data Printing) und eigene Schriften. In der DB stehen Storage-Keys,
 * keine lokalen Pfade — dadurch nodeübergreifend lesbar (horizontal skalierbar).
 */
#[IsGranted('ROLE_COMPANY_ADMIN')]
final class CardAssetUploadController
{
    public function __construct(
        private readonly CardTemplateRepository $templates,
        private readonly EntityManagerInterface $em,
        private readonly TenantContext $tenant,
        #[Autowire(service: 'card_assets.storage')]
        private readonly FilesystemOperator $cardAssets,
    ) {
    }

    #[Route('/api/companies/{id}/card-template/background', name: 'card_bg_upload', methods: ['POST'])]
    public function uploadBackground(string $id, Request $request): JsonResponse
    {
        $company = $this->company($id);
        $file = $this->file($request);
        if ('pdf' !== strtolower((string) $file->getClientOriginalExtension())) {
            throw new BadRequestHttpException('Nur PDF erlaubt.');
        }

        $template = $this->getOrCreate($company);
        $key = $this->store($file, $company->getId(), 'background', 'pdf');
        $template->setBackgroundPath($key);
        $this->em->persist($template);
        $this->em->flush();

        return new JsonResponse(['backgroundKey' => $key, 'fileName' => $file->getClientOriginalName()], 201);
    }

    #[Route('/api/companies/{id}/card-template/background', name: 'card_bg_get', methods: ['GET'])]
    public function getBackground(string $id): Response
    {
        $company = $this->company($id);
        $key = $this->templates->findCardForCompany($company)?->getBackgroundPath();
        if (!$key || !$this->cardAssets->fileExists($key)) {
            throw new NotFoundHttpException('Kein Hintergrund-PDF.');
        }

        return new StreamedResponse(function () use ($key) {
            fpassthru($this->cardAssets->readStream($key));
        }, 200, ['Content-Type' => 'application/pdf']);
    }

    #[Route('/api/companies/{id}/card-template/background', name: 'card_bg_delete', methods: ['DELETE'])]
    public function deleteBackground(string $id): JsonResponse
    {
        $company = $this->company($id);
        $template = $this->templates->findCardForCompany($company);
        if ($template && $template->getBackgroundPath()) {
            if ($this->cardAssets->fileExists($template->getBackgroundPath())) {
                $this->cardAssets->delete($template->getBackgroundPath());
            }
            $template->setBackgroundPath(null);
            $this->em->flush();
        }

        return new JsonResponse(['backgroundKey' => null]);
    }

    #[Route('/api/companies/{id}/card-template/font', name: 'card_font_upload', methods: ['POST'])]
    public function uploadFont(string $id, Request $request): JsonResponse
    {
        $company = $this->company($id);
        $file = $this->file($request);
        $ext = strtolower((string) $file->getClientOriginalExtension());
        if (!in_array($ext, ['ttf', 'otf'], true)) {
            throw new BadRequestHttpException('Nur TTF/OTF erlaubt.');
        }
        $family = trim((string) $request->request->get('family')) ?: pathinfo($file->getClientOriginalName(), PATHINFO_FILENAME);

        $template = $this->getOrCreate($company);
        $key = $this->store($file, $company->getId(), 'font', $ext);
        $template->addFont($family, $key);
        $this->em->flush();

        return new JsonResponse(['fonts' => $template->getFonts()], 201);
    }

    private function file(Request $request): UploadedFile
    {
        $file = $request->files->get('file');
        if (!$file instanceof UploadedFile) {
            throw new BadRequestHttpException('Keine Datei (Feld "file") übermittelt.');
        }

        return $file;
    }

    /** Lädt die Datei in den Object-Storage und liefert den Key zurück. */
    private function store(UploadedFile $file, Uuid $companyId, string $prefix, string $ext): string
    {
        $key = sprintf('%s/%s-%s.%s', $companyId->toRfc4122(), $prefix, bin2hex(random_bytes(4)), $ext);
        $this->cardAssets->write($key, (string) file_get_contents($file->getPathname()));

        return $key;
    }

    private function getOrCreate(Company $company): CardTemplate
    {
        return $this->templates->findCardForCompany($company)
            ?? (new CardTemplate())->setCompany($company);
    }

    private function company(string $id): Company
    {
        $company = $this->em->getRepository(Company::class)->find(Uuid::fromString($id));
        if (!$company instanceof Company) {
            throw new NotFoundHttpException('Firma nicht gefunden.');
        }
        if ($this->tenant->isPlatformAdmin()) {
            return $company;
        }
        $reseller = $this->tenant->getReseller();
        if (null === $reseller || $company->getReseller()?->getId()->equals($reseller->getId()) !== true) {
            throw new AccessDeniedHttpException('Firma gehört nicht zum eigenen Mandanten.');
        }
        $own = $this->tenant->getCompany();
        if (null !== $own && !$company->getId()->equals($own->getId())) {
            throw new AccessDeniedHttpException('Nur die eigene Firma.');
        }

        return $company;
    }
}