<?php

/**
 * webtrees: online genealogy
 * Copyright (C) 2019 webtrees development team
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU 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 General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
declare(strict_types=1);

namespace Fisharebest\Webtrees\Http\Middleware;

use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Server\MiddlewareInterface;
use Psr\Http\Server\RequestHandlerInterface;
use RuntimeException;
use function explode;
use function parse_url;
use function preg_replace;
use function rtrim;
use const PHP_URL_HOST;
use const PHP_URL_PATH;
use const PHP_URL_PORT;
use const PHP_URL_SCHEME;

/**
 * Middleware to set the base URL.
 */
class BaseUrl implements MiddlewareInterface
{
    /**
     * @param ServerRequestInterface  $request
     * @param RequestHandlerInterface $handler
     *
     * @return ResponseInterface
     */
    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
    {
        // The request URL, as auto-detected from the environment.
        $request_url = $request->getUri();

        // The base URL, as specified in the configuration file.
        $base_url = $request->getAttribute('base_url', '');

        if ($base_url === '') {
            // Guess the base URL from the request URL.
            $base_url = rtrim(explode('index.php', (string) $request_url)[0], '/');
            $request  = $request->withAttribute('base_url', $base_url);
        } else {
            // Update the request URL from the base URL.
            $base_scheme = parse_url($base_url, PHP_URL_SCHEME) ?? 'http';
            $base_host   = parse_url($base_url, PHP_URL_HOST) ?? 'localhost';
            $base_port   = parse_url($base_url, PHP_URL_PORT);

            $request_url = $request_url
                ->withScheme($base_scheme)
                ->withHost($base_host)
                ->withPort($base_port === null ? null : (string) $base_port);

            $request = $request->withUri($request_url);
        }

        return $handler->handle($request);
    }
}