<?php

declare(strict_types=1);

namespace Shlinkio\Shlink\Core\Action;

use Endroid\QrCode\QrCode;
use Mezzio\Router\RouterInterface;
use Psr\Http\Message\ResponseInterface as Response;
use Psr\Http\Message\ServerRequestInterface as Request;
use Psr\Http\Server\MiddlewareInterface;
use Psr\Http\Server\RequestHandlerInterface;
use Psr\Log\LoggerInterface;
use Psr\Log\NullLogger;
use Shlinkio\Shlink\Common\Response\QrCodeResponse;
use Shlinkio\Shlink\Core\Exception\ShortUrlNotFoundException;
use Shlinkio\Shlink\Core\Service\ShortUrl\ShortUrlResolverInterface;

class QrCodeAction implements MiddlewareInterface
{
    private const DEFAULT_SIZE = 300;
    private const MIN_SIZE = 50;
    private const MAX_SIZE = 1000;

    private RouterInterface $router;
    private ShortUrlResolverInterface $urlResolver;
    private LoggerInterface $logger;

    public function __construct(
        RouterInterface $router,
        ShortUrlResolverInterface $urlResolver,
        ?LoggerInterface $logger = null
    ) {
        $this->router = $router;
        $this->urlResolver = $urlResolver;
        $this->logger = $logger ?: new NullLogger();
    }

    public function process(Request $request, RequestHandlerInterface $handler): Response
    {
        // Make sure the short URL exists for this short code
        $shortCode = $request->getAttribute('shortCode');
        $domain = $request->getUri()->getAuthority();

        try {
            $this->urlResolver->shortCodeToEnabledShortUrl($shortCode, $domain);
        } catch (ShortUrlNotFoundException $e) {
            $this->logger->warning('An error occurred while creating QR code. {e}', ['e' => $e]);
            return $handler->handle($request);
        }

        $path = $this->router->generateUri(RedirectAction::class, ['shortCode' => $shortCode]);
        $size = $this->getSizeParam($request);

        $qrCode = new QrCode((string) $request->getUri()->withPath($path)->withQuery(''));
        $qrCode->setSize($size);
        $qrCode->setMargin(0);
        return new QrCodeResponse($qrCode);
    }

    /**
     */
    private function getSizeParam(Request $request): int
    {
        $size = (int) $request->getAttribute('size', self::DEFAULT_SIZE);
        if ($size < self::MIN_SIZE) {
            return self::MIN_SIZE;
        }

        return $size > self::MAX_SIZE ? self::MAX_SIZE : $size;
    }
}