<?php

namespace Deblan\SslCert;

/**
 * class Parser.
 *
 * @author Simon Vieille <simon@deblan.fr>
 */
class Parser
{
    /**
     * @var string
     */
    protected $check;

    /**
     * Constructor.
     *
     * @param mixed $whois
     */
    public function __construct(string $check)
    {
        $this->check = $check;
    }

    /**
     * Extracts expiry date.
     *
     * @return DateTime|null
     */
    public function getExpiryDate(): ? \DateTime
    {
        preg_match('/days=([^;]+);/', $this->check, $match);

        if (isset($match[1])) {
            $days = (int) $match[1];

            if ($days > 0) {
                $date = 'now +'.$days.' days';
            } else {
                $date = 'now '.$days.' days';
            }

            try {
                return new \DateTime($date);
            } catch (\Exception $e) {
            }
        }

        return null;
    }
}