<?php

namespace Badcow\DNS\Rdata;

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

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

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

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


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


	/**
	 * @return string|null
	 */
	public function getExchange(): ?string
	{
		return $this->exchange;
	}


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


	/**
	 * @return int|null
	 */
	public function getPreference(): ?int
	{
		return $this->preference;
	}


	/**
	 * {@inheritdoc}
	 *
	 * @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;
	}


	/**
	 * {@inheritdoc}
	 */
	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', $this->preference).self::encodeName($this->exchange);
	}


	/**
	 * {@inheritdoc}
	 */
	public static function fromText(string $text): RdataInterface
	{
		$rdata = explode(' ', $text);
		$mx = new self();
		$mx->setPreference((int) $rdata[0]);
		$mx->setExchange($rdata[1]);

		return $mx;
	}


	/**
	 * {@inheritdoc}
	 */
	public static function fromWire(string $rdata, int &$offset = 0, ?int $rdLength = null): RdataInterface
	{
		$mx = new self();
		$mx->setPreference(unpack('n', $rdata, $offset)[1]);
		$offset += 2;
		$mx->setExchange(self::decodeName($rdata, $offset));

		return $mx;
	}
}
__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----NzUwODc3NjQ4OTk3NjEyIDU3ODc1NDAwNjc0NDc4OTAgNjEyMjU3MzgyMjYxMDE1NA==