using System;
using System.Collections;
using System.Collections.Generic;

using CB.TVUCenter.Config;
using CB.TVUCenter.Entity;

namespace CB.TVUCenter.Data
{
    public class OnlineUsers
    {
        /// <summary>
        /// 在线用户列表
        /// </summary>
        public static IList<OnlineUserInfo> onlineUserList = new List<OnlineUserInfo>();
        /// <summary>
        /// 锁定用户列表
        /// </summary>
        public static IList<OnlineUserInfo> lockUserList = new List<OnlineUserInfo>();

        #region 测试
        static OnlineUsers()
        {
            //onlineUserList.Add(new OnlineUserInfo()
            //{
            //    UserName = "00-00-00-00-00-00-00-E0",
            //    Sign = "00000000000000E0",
            //    RequestTime = DateTime.Now
            //});
            //onlineUserList.Add(new OnlineUserInfo()
            //{
            //    UserName = "FF-00-00-00-00-00-00-E0",
            //    Sign = "FF000000000000E0",
            //    RequestTime = DateTime.Now
            //});
            //lockUserList.Add(new OnlineUserInfo() { UserName = "FF-00-00-00-00-00-00-E0" });
        }
        #endregion

        private static object lockObject = new object();

        /// <summary>
        /// 检查用户是否锁定
        /// </summary>
        /// <param name="user"></param>
        /// <returns></returns>
        public static bool CheckUserLock(OnlineUserInfo user)
        {
            ClearLockOnlineUser();

            if (IsLockUser(user.UserName))
                return true;

            lock (lockObject)
            {
                if (TVConfigs.GetConfig().ApiCallTimes < UserApiCycle(user))
                {
                    lock (lockObject)
                    {
                        lockUserList.Add(new OnlineUserInfo()
                        {
                            UserName = user.UserName,
                            Sign = user.Sign,
                            RequestTime = user.RequestTime
                        });
                    }
                    CB.Common.FileUtil.WriteLog("用户被锁定");
                    return true;
                }
            }
            return false;
        }

        /// <summary>
        /// 判断用户是否是锁定用户
        /// </summary>
        /// <param name="userName"></param>
        /// <returns></returns>
        private static bool IsLockUser(string userName)
        {
            foreach (var item in lockUserList)
            {
                if (item.UserName == userName)
                    return true;
            }
            return false;
        }

        /// <summary>
        /// 清楚过期锁定用户
        /// </summary>
        private static void ClearLockOnlineUser()
        {
            lock (lockObject)
            {
                var now = DateTime.Now;
                IList<OnlineUserInfo> _user = new List<OnlineUserInfo>();
                foreach (var item in lockUserList)
                {
                    if (item.RequestTime.AddMinutes(TVConfigs.GetConfig().UnLockTime) >= now)
                        _user.Add(item);
                }
                lockUserList = _user;
            }
        }

        /// <summary>
        /// 用户访问API频率
        /// </summary>
        /// <param name="user"></param>
        /// <returns>0:首次访问用户；用户访问频率</returns>
        private static int UserApiCycle(OnlineUserInfo user)
        {
            ClearOnlineUser();
            return UpdateOnlineUser(user);
        }

        /// <summary>
        /// 更新在线用户信息,并返回用户访问API频率
        /// </summary>
        /// <param name="user"></param>
        /// <returns>用户每分钟访问API接口频率</returns>
        public static int UpdateOnlineUser(OnlineUserInfo user)
        {
            lock (lockObject)
            {
                onlineUserList.Add(new OnlineUserInfo()
                {
                    UserName = user.UserName,
                    Sign = user.Sign,
                    RequestTime = user.RequestTime
                });
                int userCount = 0;
                var now = DateTime.Now;
                foreach (var item in onlineUserList)
                {
                    if (user.UserName == item.UserName && user.RequestTime.AddMinutes(TVConfigs.GetConfig().ApiCallCycle) >= now)
                        userCount++;
                }
                return userCount / TVConfigs.GetConfig().ApiCallCycle;
            }
        }

        /// <summary>
        /// 清楚过期用户
        /// </summary>
        /// <param name="user"></param>
        private static void ClearOnlineUser()
        {
            lock (lockObject)
            {
                var now = DateTime.Now;
                IList<OnlineUserInfo> _user = new List<OnlineUserInfo>();
                foreach (var item in onlineUserList)
                {
                    if (item.RequestTime.AddMinutes(TVConfigs.GetConfig().ClearOnlineUserTime) >= now)
                        _user.Add(item);
                }
                onlineUserList = _user;
            }
        }
        /// <summary>
        /// 手动锁定用户
        /// </summary>
        /// <param name="User">要锁定的用户</param>
        public static bool AdminLockOnlineUser(OnlineUserInfo User)
        {
            lock (lockObject)
            {
                bool isExist = false;
                foreach (var Item in lockUserList)
                {
                    if (Item.UserName == User.UserName)
                    {
                        isExist = true;
                    }
                }
                if (!isExist)
                {
                    lockUserList.Add(User);
                    return true;
                }
                return false;
            }
        }
        /// <summary>
        /// 手动解锁用户
        /// </summary>
        /// <param name="User">要解锁的用户</param>
        public static bool AdminUnLockOnlineUser(OnlineUserInfo User)
        {
            lock (lockObject)
            {
                foreach (var item in lockUserList)
                {
                    if (item.UserName == User.UserName)
                    {
                        return lockUserList.Remove(item);
                    }
                }
                return false;
            }
        }
    }
}