<?php

namespace Badcow\DNS\Rdata;

use Badcow\DNS\Message;

/**
 * @see https://tools.ietf.org/html/rfc1035#section-3.3.9
 */
class MX implements RdataInterface
{
    use RdataTrait;

    public const TYPE = 'MX';
    public const TYPE_CODE = 15;

    /** @var int|null */
    private $preference;

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

    public function setExchange(string $exchange): void
    {
        $this->exchange = $exchange;
    }

    public function getExchange(): ?string
    {
        return $this->exchange;
    }

    public function setPreference(int $preference): void
    {
        $this->preference = $preference;
    }

    public function getPreference(): ?int
    {
        return $this->preference;
    }

    /**
     * @throws \InvalidArgumentException throws exception if preference or exchange have not been set
     */
    public function toText(): string
    {
        if (null === $this->preference) {
            throw new \InvalidArgumentException('No preference has been set on MX object.');
        }

        if (null === $this->exchange) {
            throw new \InvalidArgumentException('No exchange has been set on MX object.');
        }

        return $this->preference.' '.$this->exchange;
    }

    public function toWire(): string
    {
        if (null === $this->preference) {
            throw new \InvalidArgumentException('No preference has been set on MX object.');
        }

        if (null === $this->exchange) {
            throw new \InvalidArgumentException('No exchange has been set on MX object.');
        }

        return pack('n', $this->preference).Message::encodeName($this->exchange);
    }

    public function fromText(string $text): void
    {
        $rdata = explode(' ', $text);
        $this->setPreference((int) $rdata[0]);
        $this->setExchange($rdata[1]);
    }

    public function fromWire(string $rdata, int &$offset = 0, ?int $rdLength = null): void
    {
        if (false === $preference = unpack('n', $rdata, $offset)) {
            throw new DecodeException(static::TYPE, $rdata);
        }
        $this->setPreference($preference[1]);
        $offset += 2;
        $this->setExchange(Message::decodeName($rdata, $offset));
    }
}__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----NTM5MDQ4Mzg2NjA1MzM3NiA5MDc5OTc2MjA2MjQxOTkxIDc1NjE2MDAwMzMxODQ3MjI=