declare(strict_types=1);

use Psr\Http\Message\ResponseInterface as Response;
use Psr\Http\Message\ServerRequestInterface as Request;

require __DIR__.'/../vendor/autoload.php';

$app = \Slim\Factory\AppFactory::create();

// Register the http cache middleware.
$app->add(new \Slim\HttpCache\Cache('public', 86400));

// Create the cache provider.
$cacheProvider = new \Slim\HttpCache\CacheProvider();

// Register a route and let the closure callback inherit the cache provider.
$app->get(
    '/',
    function (Request $request, Response $response, array $args) use ($cacheProvider): Response {
        // Use the cache provider.
        $response = $cacheProvider->withEtag($response, 'abc');

        $response->getBody()->write('Hello world!');

        return $response;
    }
);

$app->run();