<?php

namespace Badcow\DNS\Rdata;

use Badcow\DNS\Parser\Tokens;

/**
 * {@link https://tools.ietf.org/html/rfc2535#section-3.1}.
 */
class KEY implements RdataInterface
{
	use RdataTrait;

	const TYPE = 'KEY';
	const TYPE_CODE = 25;

	/**
	 * {@link https://tools.ietf.org/html/rfc4034#section-2.1.1}.
	 *
	 * @var int
	 */
	protected $flags;

	/** @var int */
	protected $protocol;

	/**
	 * The Algorithm field identifies the public key's cryptographic
	 * algorithm and determines the format of the Public Key field.
	 * {@link https://tools.ietf.org/html/rfc4034#section-2.1.3}.
	 *
	 * @var int
	 */
	protected $algorithm;

	/**
	 * The Public Key field is a Base64 encoding of the Public Key.
	 * Whitespace is allowed within the Base64 text.
	 * {@link https://tools.ietf.org/html/rfc4034#section-2.1.4}.
	 *
	 * @var string
	 */
	protected $publicKey;


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


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


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


	/**
	 * @param string $publicKey
	 *
	 * @throws \InvalidArgumentException
	 */
	public function setPublicKey(string $publicKey): void
	{
		if (false === $key = base64_decode($publicKey)) {
		    throw new \InvalidArgumentException('The public key must be a valid base64 encoded string.');
		}

		$this->publicKey = $key;
	}


	/**
	 * @return int
	 */
	public function getFlags(): int
	{
		return $this->flags;
	}


	/**
	 * @return int
	 */
	public function getProtocol(): int
	{
		return $this->protocol;
	}


	/**
	 * @return int
	 */
	public function getAlgorithm(): int
	{
		return $this->algorithm;
	}


	/**
	 * @return string
	 */
	public function getPublicKey(): string
	{
		return base64_encode($this->publicKey);
	}


	/**
	 * {@inheritdoc}
	 */
	public function toText(): string
	{
		return sprintf('%d %d %d %s', $this->flags, $this->protocol, $this->algorithm, base64_encode($this->publicKey));
	}


	/**
	 * {@inheritdoc}
	 */
	public function toWire(): string
	{
		return pack('nCC', $this->flags, $this->protocol, $this->algorithm).$this->publicKey;
	}


	/**
	 * {@inheritdoc}
	 */
	public static function fromText(string $text): RdataInterface
	{
		$rdata = explode(Tokens::SPACE, $text);
		$key = new static();
		$key->setFlags((int) array_shift($rdata));
		$key->setProtocol((int) array_shift($rdata));
		$key->setAlgorithm((int) array_shift($rdata));
		$key->setPublicKey(implode('', $rdata));

		return $key;
	}


	/**
	 * {@inheritdoc}
	 */
	public static function fromWire(string $rdata, int &$offset = 0, ?int $rdLength = null): RdataInterface
	{
		$rdLength = $rdLength ?? strlen($rdata);
		$integers = unpack('nflags/Cprotocol/Calgorithm', $rdata, $offset);
		$offset += 4;
		$key = new static();
		$key->setFlags((int) $integers['flags']);
		$key->setProtocol((int) $integers['protocol']);
		$key->setAlgorithm((int) $integers['algorithm']);
		$key->publicKey = substr($rdata, $offset, $rdLength - 4);
		$offset += $rdLength - 4;

		return $key;
	}
}
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