<?php

namespace Badcow\DNS;

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

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

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

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

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

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

    /**
     * @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];
    }

    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:----ODExMDY4MTc1OTQyODg3MiAzNzI5MDE0MTgyNDM2ODQwIDcyMTE0MTY0NTg4MDYyMDg=