using SA_LTT.Base;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SA_LTT.UserInfo
{
    public delegate void UserInfoChanged();
    public class UserManager : XmlManager<User>
    {
        Equipment _equipment;
        readonly string _extension = ".xml";
        readonly string _filePath = @"User\";

        public event UserInfoChanged Changed;

        private Dictionary<string, User> _users = new Dictionary<string, User>();

        private Dictionary<string, User> Users
        {
            get
            {
                return _users;
            }

            set
            {
                _users = value;
            }
        }

        public UserManager(Equipment equipment)
        {
            _equipment = equipment;
            RefreshUsers();
        }

        public void RefreshUsers()
        {
            DirectoryInfo directoryInfo = new DirectoryInfo(Equipment.infoFilePath + _filePath);

            if(directoryInfo.Exists == false)
            {
                directoryInfo.Create();
            }

            foreach (FileInfo fileInfo in directoryInfo.GetFiles("*.xml"))
            {
                User user = new User();

                if(TryReadFile(fileInfo.FullName, out user))
                {
                    if (Users.ContainsKey(user.Name))
                    {
                        Users[user.Name] = user.Clone();
                    }
                    else
                    {
                        Users.Add(user.Name, user.Clone());
                    }
                }
            }

            // DIT 계정 없을 시 생성.
            if (Users.ContainsKey("DIT") == false)
            {
                User user = new User();
                user.Name = "DIT";
                user.Password = "1234";
                user.Level = UserLevel.Master;

                SaveOrCreate(user);
            }

            // Operator 계정 없을 시 생성.
            if (Users.ContainsKey("Operator") == false)
            {
                User user = new User();
                user.Name = "Operator";
                user.Password = "1234";
                user.Level = UserLevel.Operator;

                SaveOrCreate(user);
            }
        }

        public void SaveOrCreate(User user)
        {
            SaveFile(Equipment.infoFilePath + _filePath + user.Name + _extension, user);

            if (Users.ContainsKey(user.Name))
            {
                Users[user.Name] = user.Clone();
            }
            else
            {
                Users.Add(user.Name, user.Clone());
            }

            Changed?.Invoke();
        }

        public void Delete(string userName)
        {
            DeleteFile(Equipment.infoFilePath + _filePath + userName + _extension);

            if (Users.ContainsKey(userName))
            {
                Users.Remove(userName);
            }

            Changed?.Invoke();
        }

        public bool ExistsUser(string userName)
        {
            if(_users.ContainsKey(userName))
            {
                return true;
            }
            else
            {
                return false;
            }
        }

        public User GetUser(string userName)
        {
            if(ExistsUser(userName))
            {
                return _users[userName].Clone();
            }
            else
            {
                return null;
            }
        }

        public User[] GetUserList()
        {
            List<User> userList = new List<User>();

            foreach(User user in Users.Values)
            {
                userList.Add(user.Clone());
            }

            return userList.ToArray();
        }
    }
}