<?php

declare(strict_types=1);

namespace Cose;

use Brick\Math\BigInteger as BrickBigInteger;
use function chr;
use function hex2bin;
use function strlen;
use function unpack;

/**
 * @internal
 */
final class BigInteger
{
    private function __construct(
        private readonly BrickBigInteger $value
    ) {
    }

    public static function createFromBinaryString(string $value): self
    {
        $res = unpack('H*', $value);
        $data = current($res);

        return new self(BrickBigInteger::fromBase($data, 16));
    }

    public static function createFromDecimal(int $value): self
    {
        return new self(BrickBigInteger::of($value));
    }

    /**
     * Converts a BigInteger to a binary string.
     */
    public function toBytes(): string
    {
        if ($this->value->isEqualTo(BrickBigInteger::zero())) {
            return '';
        }

        $temp = $this->value->toBase(16);
        $temp = 0 !== (strlen($temp) & 1) ? '0' . $temp : $temp;
        $temp = hex2bin($temp);

        return ltrim($temp, chr(0));
    }

    /**
     * Adds two BigIntegers.
     */
    public function add(self $y): self
    {
        $value = $this->value->plus($y->value);

        return new self($value);
    }

    /**
     * Subtracts two BigIntegers.
     */
    public function subtract(self $y): self
    {
        $value = $this->value->minus($y->value);

        return new self($value);
    }

    /**
     * Multiplies two BigIntegers.
     */
    public function multiply(self $x): self
    {
        $value = $this->value->multipliedBy($x->value);

        return new self($value);
    }

    /**
     * Performs modular exponentiation.
     */
    public function modPow(self $e, self $n): self
    {
        $value = $this->value->modPow($e->value, $n->value);

        return new self($value);
    }

    /**
     * Performs modular exponentiation.
     */
    public function mod(self $d): self
    {
        $value = $this->value->mod($d->value);

        return new self($value);
    }

    /**
     * Compares two numbers.
     */
    public function compare(self $y): int
    {
        return $this->value->compareTo($y->value);
    }
}__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----MzczMzI4MDM3NDgzMzkwNCA2ODIxODUyNDYzMDk1MDMgNjk3MjMxODQ3NTc2MTk4NA==