using System;

using System.Collections;

using Newtonsoft.Json;

​

public class Program

{

  public static void Main()

  {

    var userState = new UserState { Roles = Types.Roles.Admin | Types.Roles.Cashier };

    userState.Permissions.SetPermission(Types.Permissions.AcceptCash);

    userState.Permissions.SetPermission(Types.Permissions.AcceptCreditCard);

    userState.Permissions.SetPermission(Types.Permissions.CanAlsoDoThis);

    Console.WriteLine($"Has Admin Role: {userState.Roles.HasFlag(Types.Roles.Admin)}");

    Console.WriteLine($"Has Cashier Role: {userState.Roles.HasFlag(Types.Roles.Cashier)}");

    Console.WriteLine($"Has Clerk Role: {userState.Roles.HasFlag(Types.Roles.Clerk)}");

    Console.WriteLine();

    Console.WriteLine($"Accept Cash: {userState.Permissions.HasFlag(Types.Permissions.AcceptCash)}");

    Console.WriteLine($"Accept Paper Check: {userState.Permissions.HasFlag(Types.Permissions.AcceptPaperCheck)}");

    Console.WriteLine($"Accept Credit Card: {userState.Permissions.HasFlag(Types.Permissions.AcceptCreditCard)}");

    Console.WriteLine($"Can Also Do This: {userState.Permissions.HasFlag(Types.Permissions.CanAlsoDoThis)}");

    Console.WriteLine();

    var userStateSerialized = JsonConvert.SerializeObject(userState);

    Console.WriteLine(userStateSerialized);

    Console.WriteLine();

    var userStateDeserialized = JsonConvert.DeserializeObject<UserState>(userStateSerialized);

    Console.WriteLine($"Accept Cash: {userStateDeserialized.Permissions.HasFlag(Types.Permissions.AcceptCash)}");

    Console.WriteLine($"Accept Paper Check: {userStateDeserialized.Permissions.HasFlag(Types.Permissions.AcceptPaperCheck)}");

    Console.WriteLine($"Accept Credit Card: {userStateDeserialized.Permissions.HasFlag(Types.Permissions.AcceptCreditCard)}");

    Console.WriteLine($"Can Also Do This: {userStateDeserialized.Permissions.HasFlag(Types.Permissions.CanAlsoDoThis)}");

    Console.WriteLine();

  }

​

  public class Permissions

  {

    public Permissions(byte[] permissionData = null)

    {

      PermissionsData = permissionData?.Length > 0 ? new BitArray(permissionData) : new BitArray(1000); // Enum.GetNames(typeof(Types.Permissions)).Length + 1

    }

​

    public BitArray PermissionsData { get; private set; }

​

    public bool HasFlag(Types.Permissions permissionType)

    {

      return PermissionsData[(int)permissionType];

    }

​

    //#if DEBUG || TEST

    internal void SetPermission(Types.Permissions permissionType)

    {

      PermissionsData[(int)permissionType] = true;

    }

    //#endif

  }

​

  public class Types

  {

    public enum Permissions

    {

      AcceptCash = 0,

      AcceptPaperCheck = 1,

      AcceptCreditCard = 2,

      CanAlsoDoThis = 999,

    }

​

    [Flags]

    public enum Roles : Int64

    {

      Admin = 1 << 0,

      Cashier = 1 << 1,

      Clerk = 1 << 2,

    }

  }

  public class UserState

  {

    [JsonIgnore]

    public Permissions Permissions { get; private set; } = new Permissions(null);

​

    public Types.Roles Roles { get; set; }

​

    [JsonProperty]

    private byte[] PermissionsData

    {

      get

      {

        var permissionsArray = new byte[(int)Math.Ceiling(Permissions.PermissionsData.Length / 8d)];

        Permissions.PermissionsData.CopyTo(permissionsArray, 0);

        return permissionsArray;

      }

​

      set

      {

        Permissions = new Permissions(value);

      }

    }

  }

}