<?php

declare (strict_types=1);
/*
 * This file is part of the Monolog package.
 *
 * (c) Jordi Boggiano <j.boggiano@seld.be>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace RexFeed\Monolog\Handler\SyslogUdp;

use RexFeed\Monolog\Utils;
use Socket;
class UdpSocket
{
    protected const DATAGRAM_MAX_LENGTH = 65023;
    /** @var string */
    protected $ip;
    /** @var int */
    protected $port;
    /** @var resource|Socket|null */
    protected $socket = null;
    public function __construct(string $ip, int $port = 514)
    {
        $this->ip = $ip;
        $this->port = $port;
    }
    /**
     * @param  string $line
     * @param  string $header
     * @return void
     */
    public function write($line, $header = "")
    {
        $this->send($this->assembleMessage($line, $header));
    }
    public function close() : void
    {
        if (\is_resource($this->socket) || $this->socket instanceof Socket) {
            \socket_close($this->socket);
            $this->socket = null;
        }
    }
    /**
     * @return resource|Socket
     */
    protected function getSocket()
    {
        if (null !== $this->socket) {
            return $this->socket;
        }
        $domain = \AF_INET;
        $protocol = \SOL_UDP;
        // Check if we are using unix sockets.
        if ($this->port === 0) {
            $domain = \AF_UNIX;
            $protocol = \IPPROTO_IP;
        }
        $this->socket = \socket_create($domain, \SOCK_DGRAM, $protocol) ?: null;
        if (null === $this->socket) {
            throw new \RuntimeException('The UdpSocket to ' . $this->ip . ':' . $this->port . ' could not be opened via socket_create');
        }
        return $this->socket;
    }
    protected function send(string $chunk) : void
    {
        \socket_sendto($this->getSocket(), $chunk, \strlen($chunk), $flags = 0, $this->ip, $this->port);
    }
    protected function assembleMessage(string $line, string $header) : string
    {
        $chunkSize = static::DATAGRAM_MAX_LENGTH - \strlen($header);
        return $header . Utils::substr($line, 0, $chunkSize);
    }
}
