using System;

using System.Text;

using System.Security.Cryptography;

public class Program

{

    public static void Main()

    {

        var a = ToChar(22);

        Console.WriteLine($"{a}");

        var x = ConvertToOtherBase("999", 10, 62);

        Console.WriteLine($"{x}");

        var w = ConvertToOtherBase("22", 10, 62);

        Console.WriteLine($"{w}");

        var timestamp = new DateTimeOffset(DateTime.UtcNow).ToUnixTimeMilliseconds();

        Console.WriteLine($"DateTimeOffset(DateTime.UtcNow).ToUnixTimeMilliseconds(): {timestamp}");        

        var ts = ConvertToOtherBase(timestamp.ToString(), 10, 62);

        Console.WriteLine($"{ts}");

        Console.WriteLine("");

        var utc = DateTime.UtcNow;

        var y = ConvertToOtherBase((utc.Year - 2020).ToString(), 10, 62);

        var m = ConvertToOtherBase(utc.Month.ToString(), 10, 62);

        var d = ConvertToOtherBase(utc.Day.ToString(), 10, 62);

        var h = ConvertToOtherBase(utc.Hour.ToString(), 10, 62);

        var M = ConvertToOtherBase(utc.Minute.ToString(), 10, 62);

        var s = ConvertToOtherBase(utc.Second.ToString(), 10, 62);

        var f = ConvertToOtherBase(utc.Millisecond.ToString(), 10, 62);

        Console.WriteLine($"{y}{m}{d}{h}{M}{s}{f}");

        Console.WriteLine("");

        var hardwareId = "098H52ST479QE053V2";

        Console.WriteLine($"{hardwareId}");

        var hilasts = hardwareId.Substring(hardwareId.Length - 6);

        var hi = ConvertToOtherBase(hilasts, 16, 62);

        Console.WriteLine($"{hi}");

        Console.WriteLine("");

        var email = GetHash(SHA256.Create(), "l.bonini@intyexsystem.it");

        Console.WriteLine($"{email}");

        var emaillasts = email.Substring(email.Length - 6);

        var e = ConvertToOtherBase(emaillasts, 16, 62);

        Console.WriteLine($"{e}");

        Console.WriteLine("");

        var posid = 230000;

        var pi = ConvertToOtherBase(posid.ToString(), 10, 62);

        Console.WriteLine($"{pi}");

        Console.WriteLine("");

        Console.WriteLine("");

        Console.WriteLine($"{y}{m}{d}{h}{M}{s}{f}-101-{hi}-{e}");

    }

    public static char ToChar(int value)

    {

        const string charMappingNumbers = "0123456789";

        const string charMappingUpperCase = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

        const string charMappingLowerCase = "abcdefghijklmnopqrstuvwxyz";

        const string charMappingAll = charMappingNumbers + charMappingUpperCase + charMappingLowerCase;

        return charMappingAll[value];

    }

    private static string ConvertToOtherBase(string toConvert, int fromBase, int toBase)

    {

        const string characters = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";

​

        long value = 0;

        string result = "";

​

        foreach (char digit in toConvert.ToCharArray())

            value = (value * fromBase) + characters.IndexOf(digit);

​

        while (value > 0)

        {

            result = characters[(int)(value % toBase)] + result;

            value /= toBase;

        }

​

        return result;

    }

    private static string GetHash(HashAlgorithm hashAlgorithm, string input)

    {

        // Convert the input string to a byte array and compute the hash.

        byte[] data = hashAlgorithm.ComputeHash(Encoding.UTF8.GetBytes(input));

​

        // Create a new Stringbuilder to collect the bytes

        // and create a string.

        var sBuilder = new StringBuilder();

​

        // Loop through each byte of the hashed data

        // and format each one as a hexadecimal string.

        for (int i = 0; i < data.Length; i++)

        {

            sBuilder.Append(data[i].ToString("x2"));

        }

​

        // Return the hexadecimal string.

        return sBuilder.ToString();

    }

}