using System;

public class Program

{

     private const int UNUSED_BITS = 1; // Sign bit, Unused (always set to 0)

        private const int EPOCH_BITS = 41;

        private const int NODE_ID_BITS = 10;

        private const int SEQUENCE_BITS = 12;

            private const long CUSTOM_EPOCH = 1609459200000L;

​

    public static void Main()

    {

        long currentTimestamp = GetTimestamp();

        GenerateID(923,currentTimestamp);

        GenerateID(923,currentTimestamp+1);

        //GenerateID(524,currentTimestamp);

​

    }

    public static void GenerateID(int nodeId, long currentTimestamp)

    {

        Console.WriteLine($"GenerateId - nodeId - {nodeId}, ts - {currentTimestamp}");

        //long currentTimestamp = GetTimestamp();

        long _sequence = 0L;

        int _nodeId = nodeId;

​

        long shiftedts = currentTimestamp << (NODE_ID_BITS + SEQUENCE_BITS);

        long shiftednodeid = _nodeId << SEQUENCE_BITS;

        Console.WriteLine($"-----------------------------------------------------------------------");

        Console.WriteLine(LongToBinary(shiftedts, "shiftedts"));

        Console.WriteLine(LongToBinary(shiftednodeid, "shiftednodeid"));

        Console.WriteLine(LongToBinary(_sequence, "sequence"));

        long id = shiftedts + shiftednodeid + _sequence;

        Console.WriteLine("-------------------------------------------------------------------------------");

        Console.WriteLine(LongToBinary(id, "id - final"));

​

        Console.WriteLine("");

    }

    public static string LongToBinary(long value, string name)

    {

        string binary = Convert.ToString(value, 2).PadLeft(64, '0'); // int to binary conversion

        return $"{binary} - {value} - {name}";

    }

    private static long ToEpochMillisec(DateTime dateTime) => (long)(dateTime - DateTime.UnixEpoch).TotalMilliseconds;

    private static long GetTimestamp()

    {

       return ToEpochMillisec(DateTime.UtcNow) - CUSTOM_EPOCH;

    }

}