<?php

namespace Badcow\DNS\Rdata;

use Badcow\DNS\Parser\Tokens;

/**
 * Class SrvRdata.
 *
 * SRV is defined in RFC 2782
 *
 * @see https://tools.ietf.org/html/rfc2782
 *
 * @author Samuel Williams <sam@badcow.co>
 */
class SRV implements RdataInterface
{
	use RdataTrait;

	const TYPE = 'SRV';
	const TYPE_CODE = 33;
	const HIGHEST_PORT = 65535;
	const MAX_PRIORITY = 65535;
	const MAX_WEIGHT = 65535;

	/**
	 * The priority of this target host. A client MUST attempt to
	 * contact the target host with the lowest-numbered priority it can
	 * reach; target hosts with the same priority SHOULD be tried in an
	 * order defined by the weight field. The range is 0-65535. This
	 * is a 16 bit unsigned integer.
	 *
	 * @var int|null
	 */
	private $priority;

	/**
	 * A server selection mechanism.  The weight field specifies a
	 * relative weight for entries with the same priority. The range
	 * is 0-65535. This is a 16 bit unsigned integer.
	 *
	 * @var int|null
	 */
	private $weight;

	/**
	 * The port on this target host of this service. The range is
	 * 0-65535. This is a 16 bit unsigned integer.
	 *
	 * @var int|null
	 */
	private $port;

	/**
	 * The domain name of the target host.  There MUST be one or more
	 * address records for this name, the name MUST NOT be an alias (in
	 * the sense of RFC 1034 or RFC 2181).  Implementors are urged, but
	 * not required, to return the address record(s) in the Additional
	 * Data section.  Unless and until permitted by future standards
	 * action, name compression is not to be used for this field.
	 *
	 * A Target of "." means that the service is decidedly not
	 * available at this domain.
	 *
	 * @var string
	 */
	private $target;


	/**
	 * @return int
	 */
	public function getPriority(): ?int
	{
		return $this->priority;
	}


	/**
	 * @param int $priority
	 *
	 * @throws \InvalidArgumentException
	 */
	public function setPriority(int $priority): void
	{
		if ($priority < 0 || $priority > static::MAX_PRIORITY) {
		    throw new \InvalidArgumentException('Priority must be an unsigned integer on the range [0-65535]');
		}

		$this->priority = $priority;
	}


	/**
	 * @return int
	 */
	public function getWeight(): ?int
	{
		return $this->weight;
	}


	/**
	 * @param int $weight
	 *
	 * @throws \InvalidArgumentException
	 */
	public function setWeight(int $weight): void
	{
		if ($weight < 0 || $weight > static::MAX_WEIGHT) {
		    throw new \InvalidArgumentException('Weight must be an unsigned integer on the range [0-65535]');
		}

		$this->weight = $weight;
	}


	/**
	 * @return int
	 */
	public function getPort(): ?int
	{
		return $this->port;
	}


	/**
	 * @param int $port
	 *
	 * @throws \InvalidArgumentException
	 */
	public function setPort(int $port): void
	{
		if ($port < 0 || $port > static::HIGHEST_PORT) {
		    throw new \InvalidArgumentException('Port must be an unsigned integer on the range [0-65535]');
		}

		$this->port = $port;
	}


	/**
	 * @return string
	 */
	public function getTarget(): string
	{
		return $this->target;
	}


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


	/**
	 * {@inheritdoc}
	 */
	public function toText(): string
	{
		return sprintf('%s %s %s %s',
		    $this->priority,
		    $this->weight,
		    $this->port,
		    $this->target
		);
	}


	public function toWire(): string
	{
		return pack('nnn', $this->priority, $this->weight, $this->port).self::encodeName($this->target);
	}


	public static function fromText(string $text): RdataInterface
	{
		$rdata = explode(Tokens::SPACE, $text);
		$srv = new SRV();
		$srv->setPriority((int) $rdata[0]);
		$srv->setWeight((int) $rdata[1]);
		$srv->setPort((int) $rdata[2]);
		$srv->setTarget($rdata[3]);

		return $srv;
	}


	public static function fromWire(string $rdata, int &$offset = 0, ?int $rdLength = null): RdataInterface
	{
		$integers = unpack('npriority/nweight/nport', $rdata, $offset);
		$offset += 6;
		$srv = new self();
		$srv->setTarget(self::decodeName($rdata, $offset));
		$srv->setPriority($integers['priority']);
		$srv->setWeight($integers['weight']);
		$srv->setPort($integers['port']);

		return $srv;
	}
}
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