using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data;
using System.Configuration;
using SDT.Info.Active;
using SDT.Info;

namespace SDT.Active.ActiveUser
{
    /// <summary>
    /// PassPort 存储在线用户列表。
    /// </summary>
    public class PassPort
    {
        private static SortedList<int,ActiveUserInfo> _activeusers;
        private static List<UserEmployeeInfo> _userInfos;
        private static PassPort _instance;
        private static readonly object obj = new object();

        /// <summary>
        /// 初始化在线用户表。
        /// </summary>
        private void userstableFormat()
        {
            if (_activeusers == null)
            {
                _activeusers = new SortedList<int, ActiveUserInfo>();
                _userInfos = new List<UserEmployeeInfo>();
            }
        }

        public static PassPort Instance()
        {
            if (_instance == null)
            {
                _instance = new PassPort();
            }
            return _instance;
        }

        public int ActiveTimeout
        {
            get {
                return Config.SysBaseConfig.GetInstance().ServoActiveTimeout;
            }
        }

        public int RefreshTimeout
        {
            get {
                return Config.SysBaseConfig.GetInstance().ServoActiveTimeout * 2;
            }
        }

        private PassPort()
        {
            userstableFormat();
        }

        /// <summary>
        /// 获取全部用户列表
        /// </summary>
        /// <returns></returns>
        public List<UserEmployeeInfo> GetActiveUsers()
        {
            return _userInfos;
        }

        /// <summary>
        /// 获取在线用户
        /// </summary>
        /// <param name="sysNo">用户SysNo</param>
        /// <returns></returns>
        public UserEmployeeInfo GetActiveUserBySysNo(int sysNo)
        {
            return _userInfos.First( p => p.SysNo == sysNo);
        }

        /// <summary>
        /// 用户集合
        /// </summary>
        /// <param name="userAttr">用户属性</param>
        /// <returns></returns>
        public List<UserEmployeeInfo> GetActiveUsersByUserAttr(AppEnum.UserAttr userAttr)
        {
            return _userInfos.Where(p => p.Attr == userAttr).ToList<UserEmployeeInfo>();
        }

        /// <summary>
        /// 新用户登陆。
        /// </summary>
        public void Login(UserEmployeeInfo userInfo)
        {
            DelTimeOut();  //清除超时用户
            //若是单人登陆则注销原来登陆的用户
            this.Logout(userInfo.SysNo);
            try
            {
                ActiveUserInfo activeUserInfo = new ActiveUserInfo(userInfo.SysNo,userInfo);
                _activeusers.Add(userInfo.SysNo, activeUserInfo);
                _userInfos.Add(userInfo);
            }
            catch (Exception e)
            {
                throw (new Exception(e.Message));
            }
        }

        /// <summary>
        ///用户注销，根据Ticket或UserName。
        /// </summary>
        public void Logout(int userSysNo)
        {
            DelTimeOut();  //清除超时用户
            _activeusers.Remove(userSysNo);
        }

        /// <summary>
        ///清除超时用户。
        /// </summary>
        private bool DelTimeOut()
        {
            DateTime dtNow = DateTime.Now;
            List<ActiveUserInfo> removeActiveUser = _activeusers.Values.Where(p =>  DateTime.Compare(p.RefreshTime, dtNow.AddSeconds(- RefreshTimeout)) < 0).ToList<ActiveUserInfo>();
            foreach (ActiveUserInfo activeUser in removeActiveUser)