<?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:----MzExNTU1MzE3MDUwMzM0MyAzNjk3Njc3Njc0NTQ4NjcwIDQ4NzY0MzMzNjUyNTU1NTE=