<?php

namespace Badcow\DNS\Rdata;

use Badcow\DNS\Parser\Tokens;
use Badcow\DNS\Validator;

/**
 * Class CaaRdata.
 *
 * CAA is defined in RFC 6844
 *
 * @see https://tools.ietf.org/html/rfc6844
 *
 * @author Samuel Williams <sam@badcow.co>
 */
class CAA implements RdataInterface
{
	use RdataTrait;

	const TYPE = 'CAA';
	const TYPE_CODE = 257;
	const TAG_ISSUE = 'issue';
	const TAG_ISSUEWILD = 'issuewild';
	const TAG_IODEF = 'iodef';
	const ALLOWED_TAGS = [self::TAG_ISSUE, self::TAG_ISSUEWILD, self::TAG_IODEF];

	/**
	 * It is currently used to represent the critical flag.
	 *
	 * @var int
	 */
	private $flag;

	/**
	 * An ASCII string that represents the identifier of the property represented by the record.
	 * The RFC currently defines 3 available tags:
	 *  - issue: explicitly authorizes a single certificate authority to issue a certificate (any type) for the hostname.
	 *  - issuewild: explicitly authorizes a single certificate authority to issue a wildcard certificate (and only wildcard) for the hostname.
	 *  - iodef: specifies a URL to which a certificate authority may report policy violations.
	 *
	 * @var string
	 */
	private $tag;

	/** @var string */
	private $value;


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


	/**
	 * @param int $flag
	 *
	 * @throws \InvalidArgumentException
	 */
	public function setFlag(int $flag): void
	{
		if (!Validator::isUnsignedInteger($flag, 8)) {
		    throw new \InvalidArgumentException('Flag must be an unsigned 8-bit integer.');
		}

		$this->flag = $flag;
	}


	/**
	 * @return string
	 */
	public function getTag(): ?string
	{
		return $this->tag;
	}


	/**
	 * @param string $tag
	 *
	 * @throws \InvalidArgumentException
	 */
	public function setTag(string $tag): void
	{
		$tag = strtolower($tag);
		if (!in_array($tag, static::ALLOWED_TAGS)) {
		    throw new \InvalidArgumentException('Tag can be one of this type "issue", "issuewild", or "iodef".');
		}

		$this->tag = $tag;
	}


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


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


	/**
	 * {@inheritdoc}
	 */
	public function toText(): string
	{
		if (!isset($this->tag) || !isset($this->flag) || !isset($this->value)) {
		    throw new \InvalidArgumentException('All CAA parameters must be set.');
		}

		return sprintf('%d %s "%s"',
		    $this->flag,
		    $this->tag ?? '',
		    $this->value ?? ''
		);
	}


	/**
	 * @return string
	 */
	public function toWire(): string
	{
		if (!isset($this->tag) || !isset($this->flag) || !isset($this->value)) {
		    throw new \InvalidArgumentException('All CAA parameters must be set.');
		}

		return chr($this->flag).
		    chr(strlen($this->tag)).
		    $this->tag.
		    $this->value;
	}


	/**
	 * {@inheritdoc}
	 *
	 * @return CAA
	 */
	public static function fromWire(string $rdata, int &$offset = 0, ?int $rdLength = null): RdataInterface
	{
		$caa = new self();

		$caa->setFlag(ord($rdata[$offset]));
		++$offset;

		$tagLen = ord($rdata[$offset]);
		++$offset;

		$caa->setTag(substr($rdata, $offset, $tagLen));
		$offset += $tagLen;

		$valueLen = ($rdLength ?? strlen($rdata)) - 2 - $tagLen;
		$caa->setValue(substr($rdata, $offset, $valueLen));

		$offset = $offset += $valueLen;

		return $caa;
	}


	/**
	 * {@inheritdoc}
	 *
	 * @return CAA
	 */
	public static function fromText(string $string): RdataInterface
	{
		$caa = new self();
		$rdata = explode(Tokens::SPACE, $string);
		$caa->setFlag((int) array_shift($rdata));
		$caa->setTag((string) array_shift($rdata));
		$rdata = implode('', $rdata);
		$caa->setValue(trim($rdata, '"'));

		return $caa;
	}
}
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