<?php

namespace CBOR;

use Brick\Math\BigInteger;
use InvalidArgumentException;

use function chr;
use function count;
use function strlen;

use const STR_PAD_LEFT;

final class LengthCalculator
{
    /**
     * @return array{int, null|string}
     */
    public static function getLengthOfString(string $data): array
    {
        $length = strlen($data);

        return self::computeLength($length);
    }

    /**
     * @param array<int|string, mixed> $data
     *
     * @return array{int, null|string}
     */
    public static function getLengthOfArray(array $data): array
    {
        $length = count($data);

        return self::computeLength($length);
    }

    /**
     * @return array{int, null|string}
     */
    private static function computeLength(int $length): array
    {
        return match (true) {
            $length <= 23 => [$length, null],
            $length <= 0xFF => [24, chr($length)],
            $length <= 0xFFFF => [25, self::hex2bin(dechex($length))],
            $length <= 0xFFFFFFFF => [26, self::hex2bin(dechex($length))],
            BigInteger::of($length)->isLessThan(BigInteger::fromBase('FFFFFFFFFFFFFFFF', 16)) => [
                27,
                self::hex2bin(dechex($length)),
            ],
            default => [31, null],
        };
    }

    private static function hex2bin(string $data): string
    {
        $data = str_pad($data, (int) (2 ** ceil(log(strlen($data), 2))), '0', STR_PAD_LEFT);
        $result = hex2bin($data);
        if ($result === false) {
            throw new InvalidArgumentException('Unable to convert the data');
        }

        return $result;
    }
}__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----NTUzMTM1MzUwNDgyNjM0OSA1MjkyMTg3MzYzNDgzMTUyIDczMDQ0MzUzNDg2OTE5NTk=