<?php
/*
 * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
 *
 *  Copyright (C) 2019 - 2026 Jan Böhmer (https://github.com/jbtronics)
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as published
 *  by the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

declare(strict_types=1);

namespace App\EventSubscriber;

use App\Settings\AISettings\McpSettings;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpKernel\Event\RequestEvent;
use Symfony\Component\HttpKernel\Exception\ServiceUnavailableHttpException;
use Symfony\Component\HttpKernel\KernelEvents;

readonly class McpAccessSubscriber implements EventSubscriberInterface
{
    public function __construct(private McpSettings $mcpSettings)
    {
    }

    public static function getSubscribedEvents(): array
    {
        return [
            KernelEvents::REQUEST => ['onKernelRequest', 10],
        ];
    }

    public function onKernelRequest(RequestEvent $event): void
    {
        if (!$event->isMainRequest()) {
            return;
        }

        $path = $event->getRequest()->getPathInfo();

        if (!str_starts_with($path, '/mcp')) {
            return;
        }

        if (!$this->mcpSettings->enabled) {
            throw new ServiceUnavailableHttpException(null, 'The MCP endpoint is disabled. Enable it in the system settings.');
        }
    }
}