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<?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 Monolog\Formatter;

use Monolog\Logger;

use Gelf\Message;

use 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;

    /**

     * 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;

    }

    /**

     * {@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 (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']);

        }

        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);

        }

        /** @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;

    }

}