using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;
namespace ln.application
{
	public class AuthenticatedUser
	{
		public static AuthenticatedUser Anonymous { get; } = new AuthenticatedUser();

		public Guid ID { get; }
		public string Name { get; }

		public byte[] SecretHash { get; set; }

		public int Token { get; set; }

		public string[] Roles => Roles.ToArray();


		HashSet<string> roles = new HashSet<string>();

		public AuthenticatedUser()
		{
			ID = Guid.Empty;
			Name = "Anonymous";
		}

		public AuthenticatedUser(Guid userID, string name) : this(userID, name, new string[0]) { }
		public AuthenticatedUser(Guid userID, string name, IEnumerable<string> userRoles)
		{
			ID = userID;
			Name = name;
			foreach (string role in userRoles)
				roles.Add(role);
		}

		public bool HasRole(string role) => roles.Contains(role);

		public void SetSecret(string secret)
		{
			byte[] secretBytes = Encoding.UTF8.GetBytes(secret);
			SHA256 sha256 = SHA256.Create();
			sha256.ComputeHash(secretBytes);

			SecretHash = sha256.Hash;
		}

		public override int GetHashCode()
		{
			return ID.GetHashCode();
		}
		public override bool Equals(object obj)
		{
			if (obj is AuthenticatedUser)
			{
				AuthenticatedUser other = obj as AuthenticatedUser;
				return ID.Equals(other.ID);
			}
			return false;
		}
	}
}