class UuidFactory

class UuidFactory implements UuidFactoryInterface {
    private CodecInterface $codec;
    private DceSecurityGeneratorInterface $dceSecurityGenerator;
    private NameGeneratorInterface $nameGenerator;
    private NodeProviderInterface $nodeProvider;
    private NumberConverterInterface $numberConverter;
    private RandomGeneratorInterface $randomGenerator;
    private TimeConverterInterface $timeConverter;
    private TimeGeneratorInterface $timeGenerator;
    private TimeGeneratorInterface $unixTimeGenerator;
    private UuidBuilderInterface $uuidBuilder;
    private ValidatorInterface $validator;
    
    /**
     * @var bool whether the feature set was provided from outside, or we can
     *     operate under "default" assumptions
     */
    private bool $isDefaultFeatureSet;
    
    /**
     * @param FeatureSet|null $features A set of available features in the current environment
     */
    public function __construct(?FeatureSet $features = null) {
        $this->isDefaultFeatureSet = $features === null;
        $features = $features ?: new FeatureSet();
        $this->codec = $features->getCodec();
        $this->dceSecurityGenerator = $features->getDceSecurityGenerator();
        $this->nameGenerator = $features->getNameGenerator();
        $this->nodeProvider = $features->getNodeProvider();
        $this->numberConverter = $features->getNumberConverter();
        $this->randomGenerator = $features->getRandomGenerator();
        $this->timeConverter = $features->getTimeConverter();
        $this->timeGenerator = $features->getTimeGenerator();
        $this->uuidBuilder = $features->getBuilder();
        $this->validator = $features->getValidator();
        $this->unixTimeGenerator = $features->getUnixTimeGenerator();
    }
    
    /**
     * Returns the codec used by this factory
     */
    public function getCodec() : CodecInterface {
        return $this->codec;
    }
    
    /**
     * Sets the codec to use for this factory
     *
     * @param CodecInterface $codec A UUID encoder-decoder
     */
    public function setCodec(CodecInterface $codec) : void {
        $this->isDefaultFeatureSet = false;
        $this->codec = $codec;
    }
    
    /**
     * Returns the name generator used by this factory
     */
    public function getNameGenerator() : NameGeneratorInterface {
        return $this->nameGenerator;
    }
    
    /**
     * Sets the name generator to use for this factory
     *
     * @param NameGeneratorInterface $nameGenerator A generator to generate
     *     binary data, based on a namespace and name
     */
    public function setNameGenerator(NameGeneratorInterface $nameGenerator) : void {
        $this->isDefaultFeatureSet = false;
        $this->nameGenerator = $nameGenerator;
    }
    
    /**
     * Returns the node provider used by this factory
     */
    public function getNodeProvider() : NodeProviderInterface {
        return $this->nodeProvider;
    }
    
    /**
     * Returns the random generator used by this factory
     */
    public function getRandomGenerator() : RandomGeneratorInterface {
        return $this->randomGenerator;
    }
    
    /**
     * Returns the time generator used by this factory
     */
    public function getTimeGenerator() : TimeGeneratorInterface {
        return $this->timeGenerator;
    }
    
    /**
     * Sets the time generator to use for this factory
     *
     * @param TimeGeneratorInterface $generator A generator to generate binary
     *     data, based on the time
     */
    public function setTimeGenerator(TimeGeneratorInterface $generator) : void {
        $this->isDefaultFeatureSet = false;
        $this->timeGenerator = $generator;
    }
    
    /**
     * Returns the DCE Security generator used by this factory
     */
    public function getDceSecurityGenerator() : DceSecurityGeneratorInterface {
        return $this->dceSecurityGenerator;
    }
    
    /**
     * Sets the DCE Security generator to use for this factory
     *
     * @param DceSecurityGeneratorInterface $generator A generator to generate
     *     binary data, based on a local domain and local identifier
     */
    public function setDceSecurityGenerator(DceSecurityGeneratorInterface $generator) : void {
        $this->isDefaultFeatureSet = false;
        $this->dceSecurityGenerator = $generator;
    }
    
    /**
     * Returns the number converter used by this factory
     */
    public function getNumberConverter() : NumberConverterInterface {
        return $this->numberConverter;
    }
    
    /**
     * Sets the random generator to use for this factory
     *
     * @param RandomGeneratorInterface $generator A generator to generate binary
     *     data, based on some random input
     */
    public function setRandomGenerator(RandomGeneratorInterface $generator) : void {
        $this->isDefaultFeatureSet = false;
        $this->randomGenerator = $generator;
    }
    
    /**
     * Sets the number converter to use for this factory
     *
     * @param NumberConverterInterface $converter A converter to use for working
     *     with large integers (i.e. integers greater than PHP_INT_MAX)
     */
    public function setNumberConverter(NumberConverterInterface $converter) : void {
        $this->isDefaultFeatureSet = false;
        $this->numberConverter = $converter;
    }
    
    /**
     * Returns the UUID builder used by this factory
     */
    public function getUuidBuilder() : UuidBuilderInterface {
        return $this->uuidBuilder;
    }
    
    /**
     * Sets the UUID builder to use for this factory
     *
     * @param UuidBuilderInterface $builder A builder for constructing instances
     *     of UuidInterface
     */
    public function setUuidBuilder(UuidBuilderInterface $builder) : void {
        $this->isDefaultFeatureSet = false;
        $this->uuidBuilder = $builder;
    }
    
    /**
     * @psalm-mutation-free
     */
    public function getValidator() : ValidatorInterface {
        return $this->validator;
    }
    
    /**
     * Sets the validator to use for this factory
     *
     * @param ValidatorInterface $validator A validator to use for validating
     *     whether a string is a valid UUID
     */
    public function setValidator(ValidatorInterface $validator) : void {
        $this->isDefaultFeatureSet = false;
        $this->validator = $validator;
    }
    
    /**
     * @psalm-pure
     */
    public function fromBytes(string $bytes) : UuidInterface {
        return $this->codec
            ->decodeBytes($bytes);
    }
    
    /**
     * @psalm-pure
     */
    public function fromString(string $uuid) : UuidInterface {
        $uuid = strtolower($uuid);
        return $this->codec
            ->decode($uuid);
    }
    
    /**
     * @psalm-pure
     */
    public function fromInteger(string $integer) : UuidInterface {
        $hex = $this->numberConverter
            ->toHex($integer);
        $hex = str_pad($hex, 32, '0', STR_PAD_LEFT);
        return $this->fromString($hex);
    }
    public function fromDateTime(DateTimeInterface $dateTime, ?Hexadecimal $node = null, ?int $clockSeq = null) : UuidInterface {
        $timeProvider = new FixedTimeProvider(new Time($dateTime->format('U'), $dateTime->format('u')));
        $timeGenerator = new DefaultTimeGenerator($this->nodeProvider, $this->timeConverter, $timeProvider);
        $nodeHex = $node ? $node->toString() : null;
        $bytes = $timeGenerator->generate($nodeHex, $clockSeq);
        return $this->uuidFromBytesAndVersion($bytes, Uuid::UUID_TYPE_TIME);
    }
    
    /**
     * @psalm-pure
     */
    public function fromHexadecimal(Hexadecimal $hex) : UuidInterface {
        return $this->codec
            ->decode($hex->__toString());
    }
    
    /**
     * @inheritDoc
     */
    public function uuid1($node = null, ?int $clockSeq = null) : UuidInterface {
        $bytes = $this->timeGenerator
            ->generate($node, $clockSeq);
        return $this->uuidFromBytesAndVersion($bytes, Uuid::UUID_TYPE_TIME);
    }
    public function uuid2(int $localDomain, ?IntegerObject $localIdentifier = null, ?Hexadecimal $node = null, ?int $clockSeq = null) : UuidInterface {
        $bytes = $this->dceSecurityGenerator
            ->generate($localDomain, $localIdentifier, $node, $clockSeq);
        return $this->uuidFromBytesAndVersion($bytes, Uuid::UUID_TYPE_DCE_SECURITY);
    }
    
    /**
     * @inheritDoc
     * @psalm-pure
     */
    public function uuid3($ns, string $name) : UuidInterface {
        return $this->uuidFromNsAndName($ns, $name, Uuid::UUID_TYPE_HASH_MD5, 'md5');
    }
    public function uuid4() : UuidInterface {
        $bytes = $this->randomGenerator
            ->generate(16);
        return $this->uuidFromBytesAndVersion($bytes, Uuid::UUID_TYPE_RANDOM);
    }
    
    /**
     * @inheritDoc
     * @psalm-pure
     */
    public function uuid5($ns, string $name) : UuidInterface {
        return $this->uuidFromNsAndName($ns, $name, Uuid::UUID_TYPE_HASH_SHA1, 'sha1');
    }
    public function uuid6(?Hexadecimal $node = null, ?int $clockSeq = null) : UuidInterface {
        $nodeHex = $node ? $node->toString() : null;
        $bytes = $this->timeGenerator
            ->generate($nodeHex, $clockSeq);
        // Rearrange the bytes, according to the UUID version 6 specification.
        $v6 = $bytes[6] . $bytes[7] . $bytes[4] . $bytes[5] . $bytes[0] . $bytes[1] . $bytes[2] . $bytes[3];
        $v6 = bin2hex($v6);
        // Drop the first four bits, while adding an empty four bits for the
        // version field. This allows us to reconstruct the correct time from
        // the bytes of this UUID.
        $v6Bytes = hex2bin(substr($v6, 1, 12) . '0' . substr($v6, -3));
        $v6Bytes .= substr($bytes, 8);
        return $this->uuidFromBytesAndVersion($v6Bytes, Uuid::UUID_TYPE_REORDERED_TIME);
    }
    
    /**
     * Returns a version 7 (Unix Epoch time) UUID
     *
     * @param DateTimeInterface|null $dateTime An optional date/time from which
     *     to create the version 7 UUID. If not provided, the UUID is generated
     *     using the current date/time.
     *
     * @return UuidInterface A UuidInterface instance that represents a
     *     version 7 UUID
     */
    public function uuid7(?DateTimeInterface $dateTime = null) : UuidInterface {
        assert($this->unixTimeGenerator instanceof UnixTimeGenerator);
        $bytes = $this->unixTimeGenerator
            ->generate(null, null, $dateTime);
        return $this->uuidFromBytesAndVersion($bytes, Uuid::UUID_TYPE_UNIX_TIME);
    }
    
    /**
     * Returns a version 8 (Custom) UUID
     *
     * The bytes provided may contain any value according to your application's
     * needs. Be aware, however, that other applications may not understand the
     * semantics of the value.
     *
     * @param string $bytes A 16-byte octet string. This is an open blob
     *     of data that you may fill with 128 bits of information. Be aware,
     *     however, bits 48 through 51 will be replaced with the UUID version
     *     field, and bits 64 and 65 will be replaced with the UUID variant. You
     *     MUST NOT rely on these bits for your application needs.
     *
     * @return UuidInterface A UuidInterface instance that represents a
     *     version 8 UUID
     */
    public function uuid8(string $bytes) : UuidInterface {
        return $this->uuidFromBytesAndVersion($bytes, Uuid::UUID_TYPE_CUSTOM);
    }
    
    /**
     * Returns a Uuid created from the provided byte string
     *
     * Uses the configured builder and codec and the provided byte string to
     * construct a Uuid object.
     *
     * @param string $bytes The byte string from which to construct a UUID
     *
     * @return UuidInterface An instance of UuidInterface, created from the
     *     provided bytes
     *
     * @psalm-pure
     */
    public function uuid(string $bytes) : UuidInterface {
        
        /** @psalm-suppress ImpurePropertyFetch */
        return $this->uuidBuilder
            ->build($this->codec, $bytes);
    }
    
    /**
     * Returns a version 3 or 5 namespaced Uuid
     *
     * @param string|UuidInterface $ns The namespace (must be a valid UUID)
     * @param string $name The name to hash together with the namespace
     * @param int $version The version of UUID to create (3 or 5)
     * @param string $hashAlgorithm The hashing algorithm to use when hashing
     *     together the namespace and name
     *
     * @return UuidInterface An instance of UuidInterface, created by hashing
     *     together the provided namespace and name
     *
     * @psalm-pure
     */
    private function uuidFromNsAndName(UuidInterface|string $ns, string $name, int $version, string $hashAlgorithm) : UuidInterface {
        if (!$ns instanceof UuidInterface) {
            $ns = $this->fromString($ns);
        }
        $bytes = $this->nameGenerator
            ->generate($ns, $name, $hashAlgorithm);
        return $this->uuidFromBytesAndVersion(substr($bytes, 0, 16), $version);
    }
    
    /**
     * Returns an RFC 4122 variant Uuid, created from the provided bytes and version
     *
     * @param string $bytes The byte string to convert to a UUID
     * @param int $version The RFC 4122 version to apply to the UUID
     *
     * @return UuidInterface An instance of UuidInterface, created from the
     *     byte string and version
     *
     * @psalm-pure
     */
    private function uuidFromBytesAndVersion(string $bytes, int $version) : UuidInterface {
        
        /** @var array $unpackedTime */
        $unpackedTime = unpack('n*', substr($bytes, 6, 2));
        $timeHi = (int) $unpackedTime[1];
        $timeHiAndVersion = pack('n*', BinaryUtils::applyVersion($timeHi, $version));
        
        /** @var array $unpackedClockSeq */
        $unpackedClockSeq = unpack('n*', substr($bytes, 8, 2));
        $clockSeqHi = (int) $unpackedClockSeq[1];
        $clockSeqHiAndReserved = pack('n*', BinaryUtils::applyVariant($clockSeqHi));
        $bytes = substr_replace($bytes, $timeHiAndVersion, 6, 2);
        $bytes = substr_replace($bytes, $clockSeqHiAndReserved, 8, 2);
        if ($this->isDefaultFeatureSet) {
            return LazyUuidFromString::fromBytes($bytes);
        }
        
        /** @psalm-suppress ImpureVariable */
        return $this->uuid($bytes);
    }

}