<?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 ForminatorGoogleAddon\Monolog\Formatter;

use ForminatorGoogleAddon\Monolog\Logger;
use ForminatorGoogleAddon\Gelf\Message;
use ForminatorGoogleAddon\Monolog\Utils;
/**
 * Serializes a log message to GELF
 * @see http://docs.graylog.org/en/latest/pages/gelf.html
 *
 * @author Matt Lehner <mlehner@gmail.com>
 *
 * @phpstan-import-type Level from \Monolog\Logger
 */
class GelfMessageFormatter extends NormalizerFormatter
{
    protected const DEFAULT_MAX_LENGTH = 32766;
    /**
     * @var string the name of the system for the Gelf log message
     */
    protected $systemName;
    /**
     * @var string a prefix for 'extra' fields from the Monolog record (optional)
     */
    protected $extraPrefix;
    /**
     * @var string a prefix for 'context' fields from the Monolog record (optional)
     */
    protected $contextPrefix;
    /**
     * @var int max length per field
     */
    protected $maxLength;
    /**
     * @var int
     */
    private $gelfVersion = 2;
    /**
     * Translates Monolog log levels to Graylog2 log priorities.
     *
     * @var array<int, int>
     *
     * @phpstan-var array<Level, int>
     */
    private $logLevels = [Logger::DEBUG => 7, Logger::INFO => 6, Logger::NOTICE => 5, Logger::WARNING => 4, Logger::ERROR => 3, Logger::CRITICAL => 2, Logger::ALERT => 1, Logger::EMERGENCY => 0];
    public function __construct(?string $systemName = null, ?string $extraPrefix = null, string $contextPrefix = 'ctxt_', ?int $maxLength = null)
    {
        if (!\class_exists(Message::class)) {
            throw new \RuntimeException('Composer package graylog2/gelf-php is required to use Monolog\'s GelfMessageFormatter');
        }
        parent::__construct('U.u');
        $this->systemName = \is_null($systemName) || $systemName === '' ? (string) \gethostname() : $systemName;
        $this->extraPrefix = \is_null($extraPrefix) ? '' : $extraPrefix;
        $this->contextPrefix = $contextPrefix;
        $this->maxLength = \is_null($maxLength) ? self::DEFAULT_MAX_LENGTH : $maxLength;
        if (\method_exists(Message::class, 'setFacility')) {
            $this->gelfVersion = 1;
        }
    }
    /**
     * {@inheritDoc}
     */
    public function format(array $record) : Message
    {
        $context = $extra = [];
        if (isset($record['context'])) {
            /** @var mixed[] $context */
            $context = parent::normalize($record['context']);
        }
        if (isset($record['extra'])) {
            /** @var mixed[] $extra */
            $extra = parent::normalize($record['extra']);
        }
        if (!isset($record['datetime'], $record['message'], $record['level'])) {
            throw new \InvalidArgumentException('The record should at least contain datetime, message and level keys, ' . \var_export($record, \true) . ' given');
        }
        $message = new Message();
        $message->setTimestamp($record['datetime'])->setShortMessage((string) $record['message'])->setHost($this->systemName)->setLevel($this->logLevels[$record['level']]);
        // message length + system name length + 200 for padding / metadata
        $len = 200 + \strlen((string) $record['message']) + \strlen($this->systemName);
        if ($len > $this->maxLength) {
            $message->setShortMessage(Utils::substr($record['message'], 0, $this->maxLength));
        }
        if ($this->gelfVersion === 1) {
            if (isset($record['channel'])) {
                $message->setFacility($record['channel']);
            }
            if (isset($extra['line'])) {
                $message->setLine($extra['line']);
                unset($extra['line']);
            }
            if (isset($extra['file'])) {
                $message->setFile($extra['file']);
                unset($extra['file']);
            }
        } else {
            $message->setAdditional('facility', $record['channel']);
        }
        foreach ($extra as $key => $val) {
            $val = \is_scalar($val) || null === $val ? $val : $this->toJson($val);
            $len = \strlen($this->extraPrefix . $key . $val);
            if ($len > $this->maxLength) {
                $message->setAdditional($this->extraPrefix . $key, Utils::substr((string) $val, 0, $this->maxLength));
                continue;
            }
            $message->setAdditional($this->extraPrefix . $key, $val);
        }
        foreach ($context as $key => $val) {
            $val = \is_scalar($val) || null === $val ? $val : $this->toJson($val);
            $len = \strlen($this->contextPrefix . $key . $val);
            if ($len > $this->maxLength) {
                $message->setAdditional($this->contextPrefix . $key, Utils::substr((string) $val, 0, $this->maxLength));
                continue;
            }
            $message->setAdditional($this->contextPrefix . $key, $val);
        }
        if ($this->gelfVersion === 1) {
            /** @phpstan-ignore-next-line */
            if (null === $message->getFile() && isset($context['exception']['file'])) {
                if (\preg_match("/^(.+):([0-9]+)\$/", $context['exception']['file'], $matches)) {
                    $message->setFile($matches[1]);
                    $message->setLine($matches[2]);
                }
            }
        }
        return $message;
    }
}