MafiaTelegramBot/MafiaTelegramBot/Game/RoomEncrypter.cs

using System;
using System.Collections.Generic;
using System.Linq;
using MafiaTelegramBot.Resources;

namespace MafiaTelegramBot.Game
{
    public static class RoomEncrypter
    {
        private static readonly Dictionary<string, string> ShortName = new();
        private static readonly Dictionary<string, string> FullName = new();
        
        public static string GetCode(string roomName)
        {
            if (ShortName.ContainsKey(roomName)) return ShortName[roomName];
            var shortName = RandomString();
            while (ShortName.ContainsKey(shortName)) shortName = RandomString();
            ShortName.Add(roomName, shortName);
            FullName.Add(shortName, roomName);
            return shortName;
        }

        public static string GetName(string roomKey)
        {
            return FullName[roomKey];
        }
        
        public static void RemoveCode(string roomName)
        {
            FullName.Remove(GetCode(roomName));
            ShortName.Remove(roomName);
        }
        
        private static readonly Random Random = new();

        private static string RandomString(int length = Constants.ROOM_CODE_LENGTH)
        {
            const string chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
            return new string(Enumerable.Repeat(chars, length)
                .Select(s => s[Random.Next(s.Length)]).ToArray());
        }
    }
}