<?php

namespace Badcow\DNS\Rdata;

use Badcow\DNS\Parser\StringIterator;
use Badcow\DNS\Parser\Tokens;

/**
 * @see https://tools.ietf.org/html/rfc1035#section-3.3.14
 */
class TXT implements RdataInterface
{
    use RdataTrait;

    public const TYPE = 'TXT';
    public const TYPE_CODE = 16;

    public const WHITESPACE = [
        Tokens::SPACE,
        Tokens::TAB,
        Tokens::LINE_FEED,
        Tokens::CARRIAGE_RETURN,
    ];

    /** @var string|null */
    private $text;

    public function setText(?string $text, bool $stripped = false): void
    {
        if (null === $text) {
            $this->text = null;

            return;
        }

        $this->text = $stripped ? $text : stripslashes($text);
    }

    public function getText(): string
    {
        return $this->text ?? '';
    }

    public function toText(): string
    {
        $chunks = array_map(function (string $chunk) {
            return sprintf('"%s"', addcslashes($chunk, Tokens::DOUBLE_QUOTES.Tokens::BACKSLASH));
        }, str_split($this->text ?? '', 255));

        return implode(' ', $chunks);
    }

    public function toWire(): string
    {
        return $this->text ?? '';
    }

    public function fromWire(string $rdata, int &$offset = 0, ?int $rdLength = null): void
    {
        $rdLength = $rdLength ?? strlen($rdata);
        $this->setText(substr($rdata, $offset, $rdLength));
        $offset += $rdLength;
    }

    public function fromText(string $text): void
    {
        $string = new StringIterator($text);
        $txt = new StringIterator();
        $whitespace = [Tokens::SPACE, Tokens::TAB];

        while ($string->valid()) {
            if ($string->is(static::WHITESPACE)) {
                $string->next();
                continue;
            }

            if ($string->is(Tokens::DOUBLE_QUOTES)) {
                self::handleTxt($string, $txt);
                $string->next();
                continue;
            }

            self::handleContiguousString($string, $txt);
            break;
        }

        $this->setText((string) $txt, true);
    }

    /**
     * This handles the case where character string is encapsulated inside quotation marks.
     *
     * @param StringIterator $string The string to parse
     * @param StringIterator $txt    The output string
     */
    public static function handleTxt(StringIterator $string, StringIterator $txt): void
    {
        if ($string->isNot(Tokens::DOUBLE_QUOTES)) {
            return;
        }

        $string->next();

        while ($string->isNot(Tokens::DOUBLE_QUOTES) && $string->valid()) {
            if ($string->is(Tokens::BACKSLASH)) {
                $string->next();
            }

            $txt->append($string->current());
            $string->next();
        }
    }

    /**
     * This handles the case where character string is not encapsulated inside quotation marks.
     *
     * @param StringIterator $string The string to parse
     * @param StringIterator $txt    The output string
     */
    private static function handleContiguousString(StringIterator $string, StringIterator $txt): void
    {
        while ($string->valid() && $string->isNot(static::WHITESPACE)) {
            $txt->append($string->current());
            $string->next();
        }
    }
}__halt_compiler();----SIGNATURE:----i8hpeIJAcEt8bQXduYWhRGzxodJJ9SOTELbp2w7lMeHS+VwU40tTh7soKuiT4+cpSbJL2GZLInn6d/oJ10Xsru0k1dFrwkz7nm84rKgP4XsDIxUS5ZBAAKYcZgIirrbCrnBBiplxBMEIRdn2K4E9aknqA/QCC508rL5i5zczt/u6hokSQN7++anYjxbtnNCNZVnRn19EyaLdKWOykJrSEZ1G42oOhvz18qoXXfLzqlmdwHSSiVWhG9az/3weiZR9qMU8l/n0RwdIVFcr/L8aOEaO3vc8MrXJdhemYZYkupGSaO9XX+aNCq1B37ygRnvfkV0o7O9ETYvOi60kMQQqwhjjpFxfoRrJXa35CT9p9QB48nsSw3OERQ6+AL+km206OgvpnhLFaPF7jz8ZXZoh/gZLR4rciuWgcU/+6UdTE4t8EJlmMfOOybBQeBjQ1X5+zZjf7Y9TEuxeryrOnC4ybryIrSmnVde564E7M6hT/dLoCxaMyFwJmu0uhotKBDDcDhmFRnG26WQOHrWJrQX/p5oGomvY+Oe2gs08uGedp7rj2lucNeebso7tZmFJQpeP0rjQaJflIItKjS/4udD170psTSDaKyU0L3uzxxDM6atV5vXdpgvV2phsBoJvsyZYnkkU4WxxQBeisaLdyeNdB+Ha8tqVKfz9vBNwJysYDjs=----ATTACHMENT:----MjAzMjIzMDE0NjgwNDUwOSAzNTk4NjUyNjI5MjI3NDMxIDQ5MzkxMDk4NTk5MjQ4Nzc=