<?php
/**
 * @see       https://github.com/zendframework/zend-log for the canonical source repository
 * @copyright Copyright (c) 2018 Zend Technologies USA Inc. (https://www.zend.com)
 * @license   https://github.com/zendframework/zend-log/blob/master/LICENSE.md New BSD License
 */

namespace Zend\Log\Formatter;

use DateTime;

class Json implements FormatterInterface
{
    /**
     * Format specifier for DateTime objects in event data (default: ISO 8601)
     *
     * @see http://php.net/manual/en/function.date.php
     * @var string
     */
    protected $dateTimeFormat = self::DEFAULT_DATETIME_FORMAT;

    /**
     * Formats data into a single line to be written by the writer.
     *
     * @param array $event event data
     * @return string formatted line to write to the log
     */
    public function format($event)
    {
        if (isset($event['timestamp']) && $event['timestamp'] instanceof DateTime) {
            $event['timestamp'] = $event['timestamp']->format($this->getDateTimeFormat());
        }

        return @json_encode(
            $event,
            JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE | JSON_NUMERIC_CHECK | JSON_PRESERVE_ZERO_FRACTION
        );
    }

    /**
     * {@inheritDoc}
     */
    public function getDateTimeFormat()
    {
        return $this->dateTimeFormat;
    }

    /**
     * {@inheritDoc}
     */
    public function setDateTimeFormat($dateTimeFormat)
    {
        $this->dateTimeFormat = (string)$dateTimeFormat;
        return $this;
    }
}