UUIDv1TimeStamp.php
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	<?php

	namespace Keruald\OmniTools\DateTime;

	use Keruald\OmniTools\Collections\BitsVector;

	use DateTimeInterface;
	use InvalidArgumentException;

	class UUIDv1TimeStamp {

	private BitsVector $bits;

	///
	/// Constants
	///

	const OFFSET_BETWEEN_GREGORIAN_AND_UNIX_EPOCH = 0x01B21DD213814000;

	private function __construct (?BitsVector $bits = null) {
	$this->bits = $bits ?: BitsVector::new(60);
	}

	public static function fromUUIDv1 (string $uuid) : self {
	$uuidBits = BitsVector::fromDecoratedHexString($uuid);
	$timestamp = new self();

	// Reads 60 bits timestamp from UUIDv1
	// UUIDv1 Timestamp
	// time_low 0-31 28-59
	// time_mid 32-47 12-27
	// time_high 52-63 0-11
	$timestamp->bits
	->replace($uuidBits->slice(52, 12), 0, 12)
	->replace($uuidBits->slice(32, 16), 12, 16)
	->replace($uuidBits, 28, 32);

	return $timestamp;
	}

	public static function fromUUIDv6 (string $uuid) : self {
	$uuidBits = BitsVector::fromDecoratedHexString($uuid);
	$timestamp = new self();

	// Timestamp UUIv6
	// time_high 0-31 0-31
	// time_mid 32-47 32-47
	// time_low 48-60 52-63
	$timestamp->bits
	->replace($uuidBits, 0, 32)
	->replace($uuidBits->slice(32, 16), 32, 16)
	->replace($uuidBits->slice(52, 12), 48, 12);

	return $timestamp;
	}

	public static function fromBits (BitsVector $bits) : self {
	if ($bits->count() !== 60) {
	throw new InvalidArgumentException("Timestamp must be 60 bits.");
	}

	return new self($bits);
	}

	public static function fromTimeStamp (int $timestamp) : self {
	$bits = BitsVector::new(60)
	->copyInteger($timestamp, 0, 60);

	return new self($bits);
	}

	public static function fromUnixTime (float\|int $time) : self {
	$timestamp = (int)($time * 1E7)
	+ self::OFFSET_BETWEEN_GREGORIAN_AND_UNIX_EPOCH;

	return self::fromTimeStamp($timestamp);
	}

	public static function fromDateTime(DateTimeInterface $dateTime) : self {
	return self::fromUnixTime($dateTime->getTimestamp());
	}

	public static function now () : self {
	return self::fromUnixTime(microtime(true));
	}

	///
	/// Helper methods
	///

	public function writeToUUIDv1 (BitsVector $uuidBits) : void {
	// Write 60 bits timestamp to UUIDv1
	// UUIDv1 Timestamp
	// time_low 0-31 28-59
	// time_mid 32-47 12-27
	// time_high 52-63 0-11
	$uuidBits
	->replace($this->bits->slice(28, 32), 0, 32)
	->replace($this->bits->slice(12, 16), 32, 16)
	->replace($this->bits, 52, 12);
	}

	public function writeToUUIDv6 (BitsVector $uuidBits) : void {
	// Write 60 bits timestamp to UUIDv6
	// Timestamp UUIv6
	// time_high 0-31 0-31
	// time_mid 32-47 32-47
	// time_low 48-59 52-63
	$uuidBits
	->replace($this->bits, 0, 32)
	->replace($this->bits->slice(32, 16), 32, 16)
	->replace($this->bits->slice(48, 12), 52, 12);
	}

	///
	/// Properties
	///

	public function toBitsVector () : BitsVector {
	return $this->bits;
	}

	public function toUnixTime () : int {
	return (int)floor(
	($this->bits->toInteger() - self::OFFSET_BETWEEN_GREGORIAN_AND_UNIX_EPOCH) / 1E7
	);
	}

	}

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