<?php

namespace Deblan\Parser;

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

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

    /**
     * Extracts expiry date.
     *
     * @return DateTime|null
     */
    public function getExpiryDate(): ? \DateTime
    {
        $formats = [
            'expiration date',
            'expiry date',
            'expires on',
            'paid-till',
            'renewal',
            'expires',
            'domain_datebilleduntil',
            'expiration',
            'registry expiry',
            'registrar registration expiration',
        ];

        foreach ($formats as $format) {
            preg_match('/'.preg_quote($format).'\s*:?\s*([^\s]+)/i', $this->whois, $match);

            if (isset($match[1])) {
                try {
                    return new \DateTime($match[1]);
                } catch (\Exception $e) {
                }
            }
        }

        return null;
    }
}