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<?php
/**
 * This file is part of the ZBateson\MailMimeParser project.
 *
 * @license http://opensource.org/licenses/bsd-license.php BSD
 */

namespace ZBateson\MailMimeParser\Header\Part;

use DateTime;
use Exception;
use ZBateson\MbWrapper\MbWrapper;

/**
 * Parses a header into a DateTime object.
 *
 * @author Zaahid Bateson
 */
class DatePart extends LiteralPart
{
    /**
     * @var DateTime the parsed date, or null if the date could not be parsed
     */
    protected $date = null;

    /**
     * Tries parsing the passed token as an RFC 2822 date, and failing that into
     * an RFC 822 date, and failing that, tries to parse it by calling
     * new DateTime($value).
     *
     */
    public function __construct(MbWrapper $charsetConverter, string $token)
    {
        $dateToken = \trim($token);
        // parent::__construct converts character encoding -- may cause problems sometimes.
        parent::__construct($charsetConverter, $dateToken);

        // Missing "+" in timezone definition. eg: Thu, 13 Mar 2014 15:02:47 0000 (not RFC compliant)
        // Won't result in an Exception, but in a valid DateTime in year `0000` - therefore we need to check this first:
        if (\preg_match('# [0-9]{4}$#', $dateToken)) {
            $dateToken = \preg_replace('# ([0-9]{4})$#', ' +$1', $dateToken);
        // @see https://bugs.php.net/bug.php?id=42486
        } elseif (\preg_match('#UT$#', $dateToken)) {
            $dateToken = $dateToken . 'C';
        }

        try {
            $this->date = new DateTime($dateToken);
        } catch (Exception $e) {
        }
    }

    /**
     * Returns a DateTime object or null if it can't be parsed.
     *
     * @return DateTime
     */
    public function getDateTime() : ?\DateTime
    {
        return $this->date;
    }
}