<?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:----NTE0OTczNTIxODE1Nzk5NCA5ODQ0MTEyOTIwNDAzOTQwIDMxMjQ0MDIxNzY3NzcyNA==