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

using Sog;
using Sog.Service;
using ProtoCSStruct;


namespace Mail
{
    //每个Task需要一个Handler，一个Handler一个DBOperator
    public class MessageTaskHandler
    {
        /// <summary>
        /// 不要修改这个数量，除非你真的搞明白了db的多工作线程和db多进程的关系!!
        /// </summary>
        public const int MailDBWorkThreadCount = 10;

        private MailDBOperator m_dbOperator;

        private long m_lastKeepMysqlConnTimeSecond;

        //自管理
        private static MessageTaskHandler[] m_allTaskHandler;
        //先做个全局，要是锁等待比较耗时的话再分线程
        public static MessageTaskStat m_messageTaskStat;
        //旧的mysql连接
        private MailDBOperator m_oldDBOperator = null;

        public static void InitAllTaskHandler(ServerApp app)
        {
            //分配消息任务,线程数量
            uint iTaskCount = (uint)MailDBWorkThreadCount;

            TraceLog.Debug("MessageTaskHandler.InitAllHandler messageTaskCount is {0}", iTaskCount);

            MessageTaskDistributor.Instance.InitTask(iTaskCount, app);

            MailServerConfig serverConfig = MailServerUtils.GetServerConfig();
            m_allTaskHandler = new MessageTaskHandler[iTaskCount];

            MailServerUtils.ParseDBConfig(app, out int dbtype, out string dbname, out string dbip);

            for (int i = 0; i < m_allTaskHandler.Length; i++)
            {
                m_allTaskHandler[i] = new MessageTaskHandler();

                if (dbtype == 0)
                {
                    m_allTaskHandler[i].m_dbOperator = new MysqlMailDBOperator(dbname, dbip, 
                        serverConfig.dbuser, serverConfig.dbpassword);
                }
                else
                {
                    TraceLog.Error("MessageTaskHandler.InitAllTaskHandler invalid dbtype {0}", dbtype);
                }

                MessageTaskObj taskObj = MessageTaskDistributor.Instance.GetTaskByIndex(i);
                taskObj.Handler = m_allTaskHandler[i].HandlerPacket;
                taskObj.IdleTick = m_allTaskHandler[i].OnIdleTick;
            }

            ResetTaskStat();
            MessageTaskDistributor.Instance.StartAllTask();
        }

        public static void ResetTaskStat()
        {
            if(m_messageTaskStat == null)
            {
                m_messageTaskStat = new MessageTaskStat();
            }

            var config = MailServerUtils.GetServerConfig();
            if (config.isCloseAllTaskMsgStat)
            {
                m_messageTaskStat.ResetNeedMsgList(false);
                if (config.taskStatMsgs != null)
                {
                    for (int i = 0; i < config.taskStatMsgs.Length; i++)
                    {
                        if (config.taskStatMsgs[i] > 0)
                        {
                            m_messageTaskStat.AddNeedMsg(config.taskStatMsgs[i]);
                        }
                    }
                }
            }
            else
            {
                m_messageTaskStat.ResetNeedMsgList(true);
            }

        }

        public static void Tick(long nowMs)
        {
            if(m_messageTaskStat != null)
            {
                m_messageTaskStat.Tick(nowMs);
            }
        }

        public static void DisposeAllHandler()
        {
            //关闭所有消息处理任务
            MessageTaskDistributor.Instance.CloseAllTask();

            if(m_allTaskHandler == null)
            {
                return;
            }

            //销毁数据库连接，销毁对象
            for (int i = 0; i < m_allTaskHandler.Length; i++)
            {
                m_allTaskHandler[i].m_dbOperator.Dispose();
                m_allTaskHandler[i].m_dbOperator = null;
            }
            m_allTaskHandler = null;
        }

        public static void AfterReloadServerConfigChangeDB(ServerApp app)
        {
            MailServerConfig serverConfig = MailServerUtils.GetServerConfig();

            MailServerUtils.ParseDBConfig(app, out int dbtype, out string dbname, out string dbip);


            for (int i = 0; i < m_allTaskHandler.Length; i++)
            {
                m_allTaskHandler[i].m_oldDBOperator = m_allTaskHandler[i].m_dbOperator;
                m_allTaskHandler[i].m_lastKeepMysqlConnTimeSecond = AppTime.GetNowSysSecond() ;

                //建立新的链接
                if (dbtype == 0)
                {
                    m_allTaskHandler[i].m_dbOperator = new MysqlMailDBOperator(dbname, dbip
                        , serverConfig.dbuser, serverConfig.dbpassword);
                }
                else
                {
                    TraceLog.Error("MessageTaskHandler.AfterReloadServerConfigChangeDB invalid dbtype {0}", dbtype);
                }
            }
        }


        public void OnIdleTick(long idleSecond)
        {
            //5分钟保持连接一次
            if (AppTime.GetNowSysSecond() - m_lastKeepMysqlConnTimeSecond < 300)
            {
                return;
            }
            if (m_oldDBOperator != null) {
                m_oldDBOperator.Dispose();
                m_oldDBOperator = null;
            }

            m_lastKeepMysqlConnTimeSecond = AppTime.GetNowSysSecond();

            m_dbOperator.KeepAlive();
        }

        public void HandlerPacket(uint remoteAppID, StructPacket packet)
        {
            //去掉这里的时间重置逻辑，如果下面实际处理逻辑里没有进行sql查询就返回会造成KeepAlive不执行
            //m_lastKeepMysqlConnTimeSecond = AppTime.GetNowSysSecond();

            bool isNeedStat = m_messageTaskStat.IsNeedStat(packet.MsgID);
            long sTime = isNeedStat ? AppTime.GetNowSysMs() : 0;
            
            switch (packet.MsgID)
            {
                case (int)SSGameMsgID.QueryMailReq:
                    MailOp.OnQueryMailReq(remoteAppID, packet, m_dbOperator);
                    break;
                case (int)SSGameMsgID.MailOpReq:
                    MailOp.OnMailOpReq(remoteAppID, packet, m_dbOperator);
                    break;
                case (int)SSGameMsgID.QueryMailVersionReq:
                    MailOp.OnQueryMailVersionReq(remoteAppID, packet, m_dbOperator);
                    break;
                case (int)SSGameMsgID.OperationMailSearchReq:
                    MailOp.OnOperationQueryMailReq(remoteAppID, packet, m_dbOperator);
                    break;
                default:
                    TraceLog.Error("MessageTaskHandler unknow MsgID {0}", packet.MsgID);
                    break;
            }

            if(isNeedStat)
            {
                long eTime = AppTime.GetNowSysMs();
                m_messageTaskStat.OnNetRecv(packet.MsgID, packet.Header.Length + 16, eTime - sTime);
            }
        }

        
    }
}