<?php

/**
 * This file is part of the ramsey/uuid library
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 *
 * @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
 * @license http://opensource.org/licenses/MIT MIT
 */

declare(strict_types=1);

namespace Ramsey\Uuid\Codec;

use Ramsey\Uuid\Exception\InvalidUuidStringException;
use Ramsey\Uuid\UuidInterface;

use function bin2hex;
use function sprintf;
use function substr;
use function substr_replace;

/**
 * TimestampFirstCombCodec encodes and decodes COMBs, with the timestamp as the
 * first 48 bits
 *
 * In contrast with the TimestampLastCombCodec, the TimestampFirstCombCodec
 * adds the timestamp to the first 48 bits of the COMB. To generate a
 * timestamp-first COMB, set the TimestampFirstCombCodec as the codec, along
 * with the CombGenerator as the random generator.
 *
 * ``` php
 * $factory = new UuidFactory();
 *
 * $factory->setCodec(new TimestampFirstCombCodec($factory->getUuidBuilder()));
 *
 * $factory->setRandomGenerator(new CombGenerator(
 *     $factory->getRandomGenerator(),
 *     $factory->getNumberConverter()
 * ));
 *
 * $timestampFirstComb = $factory->uuid4();
 * ```
 *
 * @link https://www.informit.com/articles/printerfriendly/25862 The Cost of GUIDs as Primary Keys
 *
 * @psalm-immutable
 */
class TimestampFirstCombCodec extends StringCodec
{
    /**
     * @psalm-return non-empty-string
     * @psalm-suppress MoreSpecificReturnType we know that the retrieved `string` is never empty
     * @psalm-suppress LessSpecificReturnStatement we know that the retrieved `string` is never empty
     */
    public function encode(UuidInterface $uuid): string
    {
        $bytes = $this->swapBytes($uuid->getFields()->getBytes());

        return sprintf(
            '%08s-%04s-%04s-%04s-%012s',
            bin2hex(substr($bytes, 0, 4)),
            bin2hex(substr($bytes, 4, 2)),
            bin2hex(substr($bytes, 6, 2)),
            bin2hex(substr($bytes, 8, 2)),
            bin2hex(substr($bytes, 10))
        );
    }

    /**
     * @psalm-return non-empty-string
     * @psalm-suppress MoreSpecificReturnType we know that the retrieved `string` is never empty
     * @psalm-suppress LessSpecificReturnStatement we know that the retrieved `string` is never empty
     */
    public function encodeBinary(UuidInterface $uuid): string
    {
        /** @phpstan-ignore-next-line PHPStan complains that this is not a non-empty-string. */
        return $this->swapBytes($uuid->getFields()->getBytes());
    }

    /**
     * @throws InvalidUuidStringException
     *
     * @inheritDoc
     */
    public function decode(string $encodedUuid): UuidInterface
    {
        $bytes = $this->getBytes($encodedUuid);

        return $this->getBuilder()->build($this, $this->swapBytes($bytes));
    }

    public function decodeBytes(string $bytes): UuidInterface
    {
        return $this->getBuilder()->build($this, $this->swapBytes($bytes));
    }

    /**
     * Swaps bytes according to the timestamp-first COMB rules
     */
    private function swapBytes(string $bytes): string
    {
        $first48Bits = substr($bytes, 0, 6);
        $last48Bits = substr($bytes, -6);

        $bytes = substr_replace($bytes, $last48Bits, 0, 6);
        $bytes = substr_replace($bytes, $first48Bits, -6);

        return $bytes;
    }
}

• [F] CodecInterface.php
  Delete
• [F] GuidStringCodec.php
  Delete
• [F] OrderedTimeCodec.php
  Delete
• [F] StringCodec.php
  Delete
• [F] TimestampFirstCombCodec.php
  Delete
• [F] TimestampLastCombCodec.php
  Delete

About Section

About NFC Pay: Our Story and Mission

NFC Pay was founded with a vision to transform the way people handle transactions. Our journey is defined by a commitment to innovation, security, and convenience. We strive to deliver seamless, user-friendly payment solutions that make everyday transactions effortless and secure. Our mission is to empower you to pay with ease and confidence, anytime, anywhere.

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FAQ Section

Frequently Asked Questions About NFC Pay

Here are answers to some common questions about NFC Pay. We aim to provide clear and concise information to help you understand how our platform works and how it can benefit you. If you have any further inquiries, please don’t hesitate to contact our support team.

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