<?php declare(strict_types=1);

namespace Lubian\AttributeMagic\Infrastructure\WebApp\Route;

use Lubian\AttributeMagic\Infrastructure\Event\AsListener;
use Lubian\AttributeMagic\Infrastructure\WebApp\Request\RequestEvent;
use Symfony\Component\HttpFoundation\Response;

use function apcu_add;
use function apcu_fetch;
use function is_string;
use function md5;
use function serialize;
use function unserialize;

final class CachedResponse
{
    #[AsListener(RequestEvent::class, -99)]
    public function cachedResponse(RequestEvent $event): void
    {
        if ($event->request->getMethod() !== 'GET') {
            return;
        }

        $path = md5($event->request->getPathInfo());
        $serialized = apcu_fetch($path);

        if (! is_string($serialized)) {
            return;
        }

        /** @var Response|null $response */
        $response = unserialize($serialized);
        $event->response = $response;
        $event->stopped = true;
    }

    #[AsListener(RequestEvent::class, 99)]
    public function doCache(RequestEvent $event): void
    {
        if ($event->response === null) {
            return;
        }

        $path = md5($event->request->getPathInfo());
        apcu_add($path, serialize($event->response));
    }
}