<?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:----NDI4ODU4MzA5NzE2NTgzMCA2MzUzNTY1ODk0ODc0ODczIDM0NTIwMTM2MDI2NzY0Njk=