<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Bridge\Monolog\Handler;

use Monolog\Formatter\FormatterInterface;
use Monolog\Handler\AbstractProcessingHandler;
use Monolog\Level;
use Monolog\LogRecord;
use Symfony\Bridge\Monolog\Formatter\VarDumperFormatter;

/**
 * @author Grégoire Pineau <lyrixx@lyrixx.info>
 *
 * @internal
 */
final class ServerLogHandler extends AbstractProcessingHandler
{
    private string $host;

    /**
     * @var resource
     */
    private $context;

    /**
     * @var resource|null
     */
    private $socket;

    public function __construct(string $host, string|int|Level $level = Level::Debug, bool $bubble = true, array $context = [])
    {
        parent::__construct($level, $bubble);

        if (!str_contains($host, '://')) {
            $host = 'tcp://'.$host;
        }

        $this->host = $host;
        $this->context = stream_context_create($context);
    }

    public function handle(LogRecord $record): bool
    {
        if (!$this->isHandling($record)) {
            return false;
        }

        set_error_handler(static fn () => null);

        try {
            if (!$this->socket = $this->socket ?: $this->createSocket()) {
                return false === $this->bubble;
            }
        } finally {
            restore_error_handler();
        }

        return parent::handle($record);
    }

    protected function write(LogRecord $record): void
    {
        $recordFormatted = $this->formatRecord($record);

        set_error_handler(static fn () => null);

        try {
            if (-1 === stream_socket_sendto($this->socket, $recordFormatted)) {
                stream_socket_shutdown($this->socket, \STREAM_SHUT_RDWR);

                // Let's retry: the persistent connection might just be stale
                if ($this->socket = $this->createSocket()) {
                    stream_socket_sendto($this->socket, $recordFormatted);
                }
            }
        } finally {
            restore_error_handler();
        }
    }

    protected function getDefaultFormatter(): FormatterInterface
    {
        return new VarDumperFormatter();
    }

    /**
     * @return resource
     */
    private function createSocket()
    {
        $socket = stream_socket_client($this->host, $errno, $errstr, 0, \STREAM_CLIENT_CONNECT | \STREAM_CLIENT_ASYNC_CONNECT | \STREAM_CLIENT_PERSISTENT, $this->context);

        if ($socket) {
            stream_set_blocking($socket, false);
        }

        return $socket;
    }

    private function formatRecord(LogRecord $record): string
    {
        $recordFormatted = $record->formatted;

        foreach (['log_uuid', 'uuid', 'uid'] as $key) {
            if (isset($record->extra[$key])) {
                $recordFormatted['log_id'] = $record->extra[$key];
                break;
            }
        }

        return base64_encode(serialize($recordFormatted))."\n";
    }
}