using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Timers;

namespace SysDataLibs
{
    public class LoginGUID : IDisposable
    {
        Timer _Timer = null;
        WSLoginSessionList _LoginSessonList = null;
        int _SessionExpiredInterval = AppEnv.SysSetObj.GetInt("SessionExpiredInterval");
        public LoginGUID()
        {
            _LoginSessonList = new WSLoginSessionList();

            _SessionExpiredInterval = AppEnv.SysSetObj.GetInt("SessionExpiredInterval");
            if (_SessionExpiredInterval <= 0)
                _SessionExpiredInterval = 20;

            _Timer = new Timer();
            _Timer.AutoReset = true;
            _Timer.Enabled = true;
            _Timer.Interval = 5000;
            _Timer.Elapsed += new ElapsedEventHandler(_Timer_Elapsed);
            _Timer.Start();
        }

        void _Timer_Elapsed(object sender, ElapsedEventArgs e)
        {
            lock (_LoginSessonList)
            {
                WSLoginSessionList loList = _LoginSessonList.GetExpiredLogin(_SessionExpiredInterval);
                if (loList.Count > 0)
                {
                    foreach (WSLoginSession loSession in loList)
                    {
                        _LoginSessonList.Remove(loSession);
                    }
                }
            }
        }

        public void AddOne(string guid, UserSession session)
        {
            _LoginSessonList.Add(guid, session);
        }        

        public UserSession GetOne(string guid)
        {
            UserSession loRetVal = null;
            if (_LoginSessonList.ContainsGUID(guid))
            {
                _LoginSessonList[guid].RefreshLastAccessTime();
                loRetVal = _LoginSessonList[guid].UserSession;
            }
            return loRetVal;
        }

        public bool RemoveGUID(string guid)
        {
            bool lbRetVal = false;
            if (_LoginSessonList.ContainsGUID(guid))
            {
                lbRetVal = _LoginSessonList.Remove(_LoginSessonList[guid]);
                
            }
            return lbRetVal;
        }

        // 根据用户名称删除
        public void RemoveUser(string pcUserCode)
        {
            lock (_LoginSessonList)
            {
                WSLoginSessionList loList = _LoginSessonList.GetByUser(pcUserCode);
                if (loList.Count > 0)
                {
                    foreach (WSLoginSession loSession in loList)
                    {
                        _LoginSessonList.Remove(loSession);
                    }
                }
            }            
        }

        #region IDisposable 成员

        public void Dispose()
        {
            if (_Timer != null)
            {
                _Timer.Close();
                _Timer.Dispose();
            }
        }
        #endregion


        // 单键模式
        private static LoginGUID _Instance = null;
        public static LoginGUID Instance
        {
            get
            {
                if (_Instance == null)
                {
                    _Instance = new LoginGUID();
                }
                return _Instance;
            }
        }
    }

    public class WSLoginSessionList : List<WSLoginSession>
    {
        public void Add(string pcGUID, UserSession poUserSession)
        {
            if (!this.ContainsGUID(pcGUID))
            {
                this.Add(new WSLoginSession(pcGUID, poUserSession));
            }
        }        

        public new void Add(WSLoginSession item)
        {
            if (!this.ContainsGUID(item.GUID))
                base.Add(item);
        }

        public WSLoginSession this[string pcGUID]
        {
            get
            {
                foreach (WSLoginSession loSession in this)
                {
                    if (loSession.GUID == pcGUID)
                    {
                        return loSession;
                    }
                }
                return null;
            }
        }

        public bool ContainsGUID(string pcGUID)
        {
            foreach (WSLoginSession loSession in this)
            {
                if (loSession.GUID == pcGUID)
                {
                    return true;
                }
            }
            return false;
        }
        
        public WSLoginSessionList GetExpiredLogin(int pdExpiredTime)
        {
            WSLoginSessionList loRetVal = new WSLoginSessionList();
            foreach (WSLoginSession loLoginSession in this)
            {
                if (loLoginSession.IsExpired(pdExpiredTime))
                {
                    loRetVal.Add(loLoginSession);
                }
            }
            return loRetVal;
        }

        public WSLoginSessionList GetByUser(string pcUserCode)
        {
            WSLoginSessionList loRetVal = new WSLoginSessionList();
            foreach (WSLoginSession loLoginSession in this)
            {
                if ((loLoginSession.UserSession != null) &&
                    (loLoginSession.UserSession.UserInfo != null) &&
                    (loLoginSession.UserSession.UserInfo.UserCode == pcUserCode))
                {
                    loRetVal.Add(loLoginSession);
                }
            }
            return loRetVal;
        }
    }


    public class WSLoginSession
    {
        public WSLoginSession(string pcGUID, UserSession poUserSession)
        {
            _GUID = pcGUID;
            _UserSession = poUserSession;
        }
        string _GUID = "";
        public string GUID
        {
            get { return _GUID; }
        }
        DateTime _CreateTime = DateTime.Now;
        /// <summary>
        /// 创建时间
        /// </summary>
        public DateTime CreateTime
        {
            get { return _CreateTime; }
        }

        DateTime _LastTime = DateTime.Now;
        /// <summary>
        /// 最近一次访问时间
        /// </summary>
        public DateTime LastTime
        {
            get { return _LastTime; }
        }

        UserSession _UserSession = null;
        public UserSession UserSession
        {
            get { return _UserSession; }
        }

        public bool IsExpired(int pdExpiredTime)
        {
            TimeSpan loSpan = DateTime.Now - LastTime;
            return loSpan.Minutes > pdExpiredTime;
        }

        public void RefreshLastAccessTime()
        {
            _LastTime = DateTime.Now;
        }
    }
}