using Microsoft.Win32;
using System;
using System.Collections.Generic;
using System.IO;

namespace SHARP_CLAS_UI
{ 
    public class User_Info_Manager
    {
        #region Define
        string str_extension = ".xml";
        #endregion

        #region Property
        private static readonly Lazy<User_Info_Manager> _instatnce = new Lazy<User_Info_Manager>(() => new User_Info_Manager());

        public static User_Info_Manager Instance
        {
            get
            {
                return _instatnce.Value;
            }
        }
        #endregion

        #region Field
        private Dictionary<string, User_Info> User_Infos;

        private Xml_Manager<User_Info> xml_manager = new Xml_Manager<User_Info>();

        private string file_path;
        #endregion

        #region Construct
        public User_Info_Manager()
        {
            User_Infos = new Dictionary<string, User_Info>();
            Get_User_Info_Datas();
        }
        #endregion

        #region Function
        private void Get_File_Path()
        {
            RegistryKey rkk = Registry.CurrentUser.OpenSubKey(Equipment.Registry_Path, true);

            try
            {
                if (rkk == null)
                {
                    rkk = Registry.CurrentUser.CreateSubKey(Equipment.Registry_Path);

                    rkk.SetValue("USER_INFO", @"C:\SHARP_CLAS\SETTING\USER_INFO\");
                    file_path = @"C:\SHARP_CLAS\SETTING\USER_INFO\";
                }
                else
                {
                    object value = rkk.GetValue("USER_INFO");
                    if (value == null)
                    {
                        rkk.SetValue("USER_INFO", @"C:\SHARP_CLAS\SETTING\USER_INFO\");
                        file_path = @"C:\SHARP_CLAS\SETTING\USER_INFO\";
                    }
                    else
                    {
                        file_path = value.ToString();
                    }
                }
            }
            finally
            {
                rkk.Close();
            }
        }

        private void Get_User_Info_Datas()
        {
            Get_File_Path();

            User_Infos.Clear();

            if (Directory.Exists(file_path))
            {
                DirectoryInfo di = new DirectoryInfo(file_path);
                FileInfo[] recipes = di.GetFiles($"*{str_extension}");

                foreach (FileInfo recipe in recipes)
                {
                    User_Info user_info = new User_Info();

                    if (xml_manager.Try_Read_File(file_path + recipe, out user_info))
                    {
                        if (User_Infos.ContainsKey(user_info.ID))
                        {
                            User_Infos[user_info.ID] = user_info;
                        }
                        else
                        {
                            User_Infos.Add(user_info.ID, user_info);
                        }
                    }
                }
            }
            else
            {
                Directory.CreateDirectory(file_path);
            }

            if (!User_Infos.ContainsKey("DIT"))
            {
                User_Info info = new User_Info();
                info.Name = "DIT";
                info.Password = "DIT1234";
                info.Level = En_User_Level.Master;
                info.ID = "DIT";

                Create_User_Info(info);
            }

            if(!User_Infos.ContainsKey("OP"))
            {
                User_Info info = new User_Info();
                info.Name = "OP";
                info.Password = "1234";
                info.Level = En_User_Level.Operator;
                info.ID = "OP";

                Create_User_Info(info);
            }
        }

        public void Refresh_User_Info()
        {
            Get_User_Info_Datas();
        }

        public bool Exist_User_Info(string ID)
        {
            foreach (User_Info info in User_Infos.Values)
            {
                if (ID == info.ID)
                    return true;
            }

            return false;
        }

        public bool Create_User_Info(User_Info info)
        {
            if (!Exist_User_Info(info.ID))
            {
                if (xml_manager.Try_Save_File(file_path + info.ID + str_extension, info))
                {
                    User_Infos.Add(info.ID, info.Clone());
                    return true;
                }
                else
                    return false;
            }
            else
                return false;
        }

        public bool Delete_User_Info(string ID)
        {
            if (Exist_User_Info(ID))
            {
                User_Infos.Remove(ID);

                FileInfo fi = new FileInfo(file_path + ID + str_extension);

                if (fi.Exists)
                {
                    fi.Delete();
                }
            }

            return true;
        }

        public bool Save_User_Info(string ID, User_Info info)
        {
            if (Exist_User_Info(ID))
            {
                User_Infos[ID] = info.Clone();
                User_Infos[ID].ID = ID;

                if (xml_manager.Try_Save_File(file_path + ID + str_extension, User_Infos[ID]))
                {
                    return true;
                }
                else
                    return false;
            }
            else
            {
                return false;
            }
        }

        public bool Try_Get_User_Info(string ID, out User_Info info)
        {
            if (Exist_User_Info(ID))
            {
                info = User_Infos[ID].Clone();
                return true;
            }
            else
            {
                info = null;
                return false;
            }
        }

        public User_Info Get_User_Info(string ID)
        {
            if (Exist_User_Info(ID))
            {
                return User_Infos[ID].Clone();
            }
            else
            {
                return null;
            }
        }

        public User_Info[] Get_User_Infos()
        {
            List<User_Info> infos = new List<User_Info>();
            infos.Clear();

            foreach (User_Info info in User_Infos.Values)
            {
                infos.Add(info.Clone());
            }

            return infos.ToArray();
        }
        #endregion
    }
}