<?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:----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----ATTACHMENT:----NjM0MDMzNDI5NTI2MDYxMCA4MzgxMDkxODQ3MjI1Mjc3IDc2NTc3NzA2OTcyMzI4MDY=