<?php

namespace Badcow\DNS;

class Classes
{
	const INTERNET = 'IN';
	const CSNET = 'CS';
	const CHAOS = 'CH';
	const HESIOD = 'HS';

	const CLASS_IDS = [
	    self::CHAOS => 3,
	    self::CSNET => 2,
	    self::HESIOD => 4,
	    self::INTERNET => 1,
	];

	/** @const string[] */
	const IDS_CLASSES = [
	    1 => 'IN',
	    2 => 'CS',
	    3 => 'CH',
	    4 => 'HS',
	];

	/** @var array */
	public static $classes = [
	    self::CHAOS => 'CHAOS',
	    self::CSNET => 'CSNET',
	    self::HESIOD => 'Hesiod',
	    self::INTERNET => 'Internet',
	];


	/**
	 * Determine if a class is valid.
	 *
	 * @param string $class
	 *
	 * @return bool
	 */
	public static function isValid(string $class): bool
	{
		if (array_key_exists($class, self::$classes)) {
		    return true;
		}

		return 1 === preg_match('/^CLASS\d+$/', $class);
	}


	/**
	 * @param string $className
	 *
	 * @return int
	 *
	 * @throws \InvalidArgumentException
	 */
	public static function getClassId(string $className): int
	{
		if (!self::isValid($className)) {
		    throw new \InvalidArgumentException(sprintf('Class "%s" is not a valid DNS class.', $className));
		}

		if (1 === preg_match('/^CLASS(\d+)$/', $className, $matches)) {
		    return (int) $matches[1];
		}

		return self::CLASS_IDS[$className];
	}


	/**
	 * @param int $classId
	 *
	 * @return string
	 */
	public static function getClassName(int $classId): string
	{
		if (array_key_exists($classId, self::IDS_CLASSES)) {
		    return self::IDS_CLASSES[$classId];
		}

		return 'CLASS'.$classId;
	}
}
__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----MjY1NTQ5NDI4NDUzNjIyMCA0OTIzMTAxMjU0NzQwNzc2IDk2OTgyMjU3NTExMDIxNzA=