<?php

declare (strict_types=1);
namespace GuardDog\Vendor\CBOR\Tag;

use GuardDog\Vendor\CBOR\CBORObject;
use GuardDog\Vendor\CBOR\ListObject;
use GuardDog\Vendor\CBOR\NegativeIntegerObject;
use GuardDog\Vendor\CBOR\Normalizable;
use GuardDog\Vendor\CBOR\Tag;
use GuardDog\Vendor\CBOR\UnsignedIntegerObject;
use InvalidArgumentException;
use RuntimeException;
use function count;
use function extension_loaded;
final class BigFloatTag extends Tag implements Normalizable
{
    public function __construct(int $additionalInformation, ?string $data, CBORObject $object)
    {
        if (!extension_loaded('bcmath')) {
            throw new RuntimeException('The extension "bcmath" is required to use this tag');
        }
        if (!$object instanceof ListObject || count($object) !== 2) {
            throw new InvalidArgumentException('This tag only accepts a ListObject object that contains an exponent and a mantissa.');
        }
        $e = $object->get(0);
        if (!$e instanceof UnsignedIntegerObject && !$e instanceof NegativeIntegerObject) {
            throw new InvalidArgumentException('The exponent must be a Signed Integer or an Unsigned Integer object.');
        }
        $m = $object->get(1);
        if (!$m instanceof UnsignedIntegerObject && !$m instanceof NegativeIntegerObject && !$m instanceof NegativeBigIntegerTag && !$m instanceof UnsignedBigIntegerTag) {
            throw new InvalidArgumentException('The mantissa must be a Positive or Negative Signed Integer or an Unsigned Integer object.');
        }
        parent::__construct($additionalInformation, $data, $object);
    }
    public static function getTagId(): int
    {
        return self::TAG_BIG_FLOAT;
    }
    public static function createFromLoadedData(int $additionalInformation, ?string $data, CBORObject $object): Tag
    {
        return new self($additionalInformation, $data, $object);
    }
    public static function create(CBORObject $object): Tag
    {
        [$ai, $data] = self::determineComponents(self::TAG_BIG_FLOAT);
        return new self($ai, $data, $object);
    }
    public static function createFromExponentAndMantissa(CBORObject $e, CBORObject $m): Tag
    {
        $object = ListObject::create()->add($e)->add($m);
        return self::create($object);
    }
    public function normalize()
    {
        /** @var ListObject $object */
        $object = $this->object;
        /** @var UnsignedIntegerObject|NegativeIntegerObject $e */
        $e = $object->get(0);
        /** @var UnsignedIntegerObject|NegativeIntegerObject|NegativeBigIntegerTag|UnsignedBigIntegerTag $m */
        $m = $object->get(1);
        return rtrim(bcmul((string) $m->normalize(), bcpow('2', (string) $e->normalize(), 100), 100), '0');
    }
}
