class UnixTimeConverter

class UnixTimeConverter implements TimeConverterInterface {
    private const MILLISECONDS = 1000;
    public function __construct(CalculatorInterface $calculator) {
    }
    public function calculateTime(string $seconds, string $microseconds) : Hexadecimal {
        $timestamp = new Time($seconds, $microseconds);
        // Convert the seconds into milliseconds.
        $sec = $this->calculator
            ->multiply($timestamp->getSeconds(), new IntegerObject(self::MILLISECONDS));
        // Convert the microseconds into milliseconds; the scale is zero because
        // we need to discard the fractional part.
        $usec = $this->calculator
            ->divide(RoundingMode::DOWN, 0, $timestamp->getMicroseconds(), new IntegerObject(self::MILLISECONDS));
        
        /** @var IntegerObject $unixTime */
        $unixTime = $this->calculator
            ->add($sec, $usec);
        $unixTimeHex = str_pad($this->calculator
            ->toHexadecimal($unixTime)
            ->toString(), 12, '0', STR_PAD_LEFT);
        return new Hexadecimal($unixTimeHex);
    }
    public function convertTime(Hexadecimal $uuidTimestamp) : Time {
        $milliseconds = $this->calculator
            ->toInteger($uuidTimestamp);
        $unixTimestamp = $this->calculator
            ->divide(RoundingMode::HALF_UP, 6, $milliseconds, new IntegerObject(self::MILLISECONDS));
        $split = explode('.', (string) $unixTimestamp, 2);
        return new Time($split[0], $split[1] ?? '0');
    }

}