<?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:----MTYzMTA4MTgwNTY2MjAzMiA2MDE0MTEzMjM4NTY4ODU5IDQ3NzQwNTkzMTA0MzI1MDA=