UUIDv7TimeStamp.php
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UUIDv7TimeStamp.php
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	<?php

	namespace Keruald\OmniTools\DateTime;

	use Keruald\OmniTools\Collections\BitsVector;

	use DateTimeInterface;
	use InvalidArgumentException;

	class UUIDv7TimeStamp {

	private BitsVector $bits;

	///
	/// Constructors
	///

	private function __construct (?BitsVector $bits = null) {
	$this->bits = $bits ?: BitsVector::new(48);
	}

	public static function fromUUIDv7 (string $uuid) : self {
	$uuidBits = BitsVector::fromDecoratedHexString($uuid);

	return new self($uuidBits->slice(0, 48));
	}

	public static function fromBits (BitsVector $bits) : self {
	if ($bits->count() !== 48) {
	throw new InvalidArgumentException("UUIDv7 timestamps must be 48 bits long, 32 for unixtime, 16 for milliseconds.");
	}

	return new self($bits);
	}

	public static function fromInteger (int $value) : self {
	$bits = self::generateBitsVector($value);

	return new self($bits);
	}

	public static function fromUnixTime (int $time, int $ms = 0) : self {
	$value = self::computeIntegerValue($time, $ms);
	return self::fromInteger($value);
	}

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

	public static function now () : self {
	[$micro, $time] = explode(" ", microtime());
	return self::fromUnixTime($time, floor($micro * 1000));
	}

	///
	/// Helper methods to build a timestamp
	///

	private static function computeIntegerValue (int $time, int $ms) : int {
	return $time * 1000 + $ms;
	}

	private static function generateBitsVector (int $time): BitsVector {
	$timeBits = BitsVector::fromInteger($time);
	$len = $timeBits->count();

	if ($len == 48) {
	return $timeBits;
	}

	if ($len > 48) {
	trigger_error("Timestamp is truncated to the least significative 48 bits.", E_USER_WARNING);
	return $timeBits->slice($len - 48, 48);
	}

	return BitsVector::new(48)
	->replace($timeBits, 48 - $len, 48);
	}

	///
	/// Properties
	///

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

	}

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