using System;

using System.Text;

​

public class Program

{

    public static void Main()

    {

        ProgramExt.ILogger logger = new ProgramExt.Logger(ProgramExt.LogLevel.Info);

        var currentGuid = Guid.NewGuid();

        var result1 = generateId1(currentGuid, logger);

        var result2 = generateId2(currentGuid.ToString().Replace("-", ""), logger);

    }

​

    private static string generateId1(Guid? input = null, ProgramExt.ILogger logger = default)

    {

        // https://www.madskristensen.net/blog/generate-unique-strings-and-numbers-in-c/

        long i = 1;

        foreach (byte b in (input ?? Guid.NewGuid()).ToByteArray())

        {

            i *= ((int)b + 1);

        }

​

        var delta = DateTime.Now.Ticks;

        var result = (i - delta).ToString("x");

        logger.LogDebug($"{input}     => {i} - {delta} = {i - delta:x}");

        logger.LogInformation($"Input: {input} => result: {result}");

        return result;

    }

​

    private static string generateId2(string input = null, ProgramExt.ILogger logger = default)

    {

        long i = 1;

        foreach (byte b in Encoding.UTF8.GetBytes(input ?? Guid.NewGuid().ToString()))

        {

            i *= ((int)b + 1);

        }

​

        var delta = DateTime.Now.Ticks;

        var result = (i - delta).ToString("x");

        logger.LogDebug($"{input}     => {i} - {delta} = {i - delta:x}");

        logger.LogInformation($"Input: {input} =>     result: {result}");

        return result;

    }

}

​

namespace ProgramExt

{

    public interface ILogger

    {

        void LogDebug(string message);

        void LogDebug(Exception ex, string message);

        void LogTrace(string message);

        void LogTrace(Exception ex, string message);

        void LogInformation(string message);

        void LogInformation(Exception ex, string message);

        void LogWarning(string message);

        void LogWarning(Exception ex, string message);

        void LogError(string message);

        void LogError(Exception ex, string message);

    }

​

    public enum LogLevel

    {

        Trace,

        Debug,

        Info,

        Warn,

        Error

    }

    public class Logger : ILogger

    {

        private readonly LogLevel _logLevel;

        public Logger (LogLevel logLevel = 0)

        {

            _logLevel = logLevel;

        }

        public void LogTrace(string message)

        {

            Log((LogLevel)0, message);

        }

​

        public void LogTrace(Exception ex, string message)

        {

            Log((LogLevel)0, ex, message);

        }

​

        public void LogDebug(string message)

        {

            Log((LogLevel)1, message);

        }

​

        public void LogDebug(Exception ex, string message)

        {

            Log((LogLevel)1, ex, message);

        }

​

        public void LogInformation(string message)

        {

            Log((LogLevel)2, message);

        }

​

        public void LogInformation(Exception ex, string message)

        {

            Log((LogLevel)2, ex, message);

        }

​

        public void LogWarning(string message)

        {

            Log((LogLevel)3, message);

        }

​

        public void LogWarning(Exception ex, string message)

        {

            Log((LogLevel)3, ex, message);

        }

​

        public void LogError(string message)

        {

            Log((LogLevel)4, message);

        }

​

        public void LogError(Exception ex, string message)

        {

            Log((LogLevel)4, ex, message);

        }

        private void Log(LogLevel logLevel, string message)

        {

            if ((int)logLevel >= (int)_logLevel)

                Console.WriteLine($"[{DateTimeOffset.UtcNow}] [{logLevel.ToString()}] {message}");

        }

        private void Log(LogLevel logLevel, Exception ex, string message)

        {

            if ((int)logLevel >= (int)_logLevel)

                Console.WriteLine($"[{DateTimeOffset.UtcNow}] [{logLevel.ToString()}] {ex} - {message}");

        }

    }

}