using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

using Sog;
using ProtoCSStruct;

namespace World
{
    public static class AlertSvc
    {
        static long lastAlertTimeSec = 0;
        public static void OnTick(long nowSecond)
        {
            //停服，不检查
            if (WorldServerUtils.GetWorldServerData().m_serverStopFlag == 1)
            {
                return;
            }


            int nowOnline = 0;

            var gameSvrList = WorldServerUtils.GetWorldServerData().m_gameSvrInfo;
            foreach (var gameSvr in gameSvrList)
            {
                // 上报数据包含gatesvr, 这里只统计gamesvr
                if (ServerIDUtils.GetServerType(gameSvr.serverId) == (int) ServerType.Game)
                {
                    nowOnline += gameSvr.onlinePlayer;
                }
            }

            Check5Min(nowSecond, nowOnline);

            CheckLastDay(nowSecond, nowOnline);
        }

        private static void Check5Min(long nowSecond, int nowOnline)
        {
            AlertData data = WorldServerUtils.GetWorldServerData().m_alertData;

            int oldOnline = data.OnlinePlayer;

            //5分钟一个区间
            if (nowSecond - data.LastCheckTimeSecond >= 300)
            {
                data.LastCheckTimeSecond = nowSecond;
                data.OnlinePlayer = nowOnline;
            }

            if (nowOnline >= oldOnline)
            {
                return;
            }

            //人太少没意义
            if (oldOnline <= 500)
            {
                return;
            }

            if ((oldOnline - nowOnline) * 100 / oldOnline > 30)
            {
                string message = string.Format("AlertSvc.Check5Min online fall, old {0} now {1}", oldOnline, nowOnline);
                TraceLog.Error(message);
                WorldServerUtils.GetApp().Alerter.AlertMsg(message, 3600);
            }
        }

        private static void CheckLastDay(long nowSecond, int nowOnline)
        {
            AlertData data = WorldServerUtils.GetWorldServerData().m_alertData;

            //跨天
            if(AppTime.IsSameDay(nowSecond, data.LastDayTimeSecond, 0) == false)
            {
                data.LastDayOnline.Clear();
                data.LastDayOnline = data.TodayOnline;
                data.TodayOnline = new Dictionary<int, int>();

                data.LastDayTimeSecond = nowSecond;
                data.LastAlertIndex = -1;

                return;
            }

            DateTime time = AppTime.ConvertUnixTimeToDateTime(nowSecond*1000);

            var span = time.TimeOfDay;

            //5分钟一个区间
            int total5MinIndex = (int)span.TotalMinutes/5;

            if(data.TodayOnline.ContainsKey(total5MinIndex))
            {
                data.TodayOnline[total5MinIndex] = nowOnline;
            }
            else
            {
                data.TodayOnline.Add(total5MinIndex, nowOnline);
            }

            //比较上个5分钟

            int checkKey = total5MinIndex - 1;

            if(checkKey < 0)
            {
                return;
            }

            //告警过了
            if(data.LastAlertIndex == checkKey)
            {
                return;
            }

            data.LastAlertIndex = checkKey;

            //昨天的数据
            int yesTodayValue = 0;
            if(data.LastDayOnline.ContainsKey(checkKey))
            {
                yesTodayValue = data.LastDayOnline[checkKey];
            }
            else
            {
                return;
            }

            //今天的数据
            int todayValue = 0;
            if (data.TodayOnline.ContainsKey(checkKey))
            {
                todayValue = data.TodayOnline[checkKey];
            }
            else
            {
                return;
            }

            if(todayValue >= yesTodayValue)
            {
                return;
            }

            //人太少没意义
            if(yesTodayValue <= 300)
            {
                return;
            }

            int alertPer = 35;

            //礼拜一
            if(time.DayOfWeek == DayOfWeek.Monday)
            {
                alertPer = 50;
            }

            //凌晨
            if(time.Hour >= 1 && time.Hour <= 5)
            {
                alertPer = 50;
            }

            if ((yesTodayValue - todayValue) * 100 / yesTodayValue > alertPer)
            {
                string message = string.Format("AlertSvc.CheckLastDay online fall, old {0} now {1}", yesTodayValue, todayValue);
                TraceLog.Error(message);

                if (nowSecond > lastAlertTimeSec + 3600 * 6)
                {
                    lastAlertTimeSec = nowSecond;
                    WorldServerUtils.GetApp().Alerter.AlertMsg(message, 3600);
                }
            }
        }
    }
}