<?php

/**
 * 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; under version 2
 * of the License (non-upgradable).
 *
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Copyright (c) 2019 (original work) Open Assessment Technologies SA
 *
 */

namespace oat\tao\model\http;

use Psr\Http\Message\ResponseInterface;

/**
 * Class ResponseEmitter
 * @package oat\oatbox\http
 * @author Moyon Camille <camille@taotesting.com>
 */
class ResponseEmitter
{
    /**
     * Emit a Http Response to client
     *
     * @see https://github.com/http-interop/response-sender
     * @param ResponseInterface $response
     */
    public function __invoke(ResponseInterface $response)
    {
        $http_line = sprintf(
            'HTTP/%s %s %s',
            $response->getProtocolVersion(),
            $response->getStatusCode(),
            $response->getReasonPhrase()
        );

        if (!headers_sent()) {
            header($http_line, true, $response->getStatusCode());
            foreach ($response->getHeaders() as $name => $values) {
                foreach ($values as $value) {
                    header("$name: $value", false);
                }
            }
        }

        $stream = $response->getBody();

        if ($stream->isSeekable()) {
            $stream->rewind();
        }
        while (!$stream->eof()) {
            echo $stream->read(1024 * 8);
        }
    }
}