/**
 @file RemoteAppInfoMng.cpp
 @brief 其它节点的应用冗余信息管理类
 @author 曹顶法
*/
#include "RemoteAppInfoMng.h"
#include "pub_utility_api/TimeUtil.h"
#include "NodeMngMessage.pb.h"

using namespace std;
using namespace iot_idl;
using namespace iot_public;
using namespace iot_sys;

iot_sys::CRemoteAppInfoMng::CRemoteAppInfoMng(const iot_public::CSysInfoInterfacePtr &ptrSysInfo,
                                              const CNodeInfoMngPtr &ptrNodeInfoMng)
    :m_bLastNetworkIsActive(false),
    m_ptrSysInfo(ptrSysInfo),
    m_ptrNodeInfoMng(ptrNodeInfoMng),
    m_ptrNetworkCheck(NULL),
    m_nRecvHeartbeatTimeoutMsec(4000),
    m_nCheckPeriodMsec(200)
{
}

iot_sys::CRemoteAppInfoMng::~CRemoteAppInfoMng()
{
    m_ptrNetworkCheck.reset();
    m_ptrNodeInfoMng.reset();
    m_ptrSysInfo.reset();
}

int iot_sys::CRemoteAppInfoMng::initialize()
{
    //1.获取本节点信息
    if (iotSuccess != m_ptrSysInfo->getLocalNodeInfo(m_stLocalNodeInfo))
    {
        LOGERROR("获取本机信息失败");
        return iotFailed;
    }

    //2.获取相关的参数配置信息
    m_nRecvHeartbeatTimeoutMsec = CNodeMngCfgParam::getRemoteHeartbeatTimeoutMsec();
    m_nCheckPeriodMsec = CNodeMngCfgParam::getHeartbeatCheckPeriod();

    m_mapRecvAppInfo.clear();

    //3.初始化网络检测接口
    m_ptrNetworkCheck = getNetworkCheckInstance();
    if (m_ptrNetworkCheck == NULL)
    {
        LOGERROR("创建网络检测类失败");
        return iotFailed;
    }

    //4.初始化要管理的应用列表
    if (iotSuccess != initializeAppInfoMAP())
    {
        return iotFailed;
    }

    //5.获取本机的应用部署信息
    if (iotSuccess != m_ptrSysInfo->getLocalAppDeploy(m_vecLocalAppDeploy))
    {
        LOGERROR("获取本机的应用部署信息失败");
        return iotFailed;
    }

    return iotSuccess;
}

/* @brief 初始化要管理的应用列表 */
int iot_sys::CRemoteAppInfoMng::initializeAppInfoMAP()
{
    int64 lCurTime = getMonotonicMsec();

    AppKeyToRedundancyInfoMAP mapAppInfo = m_ptrNodeInfoMng->getAllAppInfo();
    for (AppKeyToRedundancyInfoMAP::const_iterator pApp = mapAppInfo.begin(); pApp != mapAppInfo.end(); ++pApp)
    {
        const SAppInfoKey &stAppInfoKey = pApp->first;
        if (stAppInfoKey.strNodeName == m_stLocalNodeInfo.strName)  //< 本机不需要再此类中管理
        {
            continue;
        }

        SNodeInfo stNode;
        if (iotSuccess != m_ptrSysInfo->getNodeInfoByName(stAppInfoKey.strNodeName, stNode))
        {
            LOGERROR("获取节点[%s]信息失败", stAppInfoKey.strNodeName.c_str());
            return iotFailed;
        }

        SAppHeartbeatInfo stRecvAppInfo;
        stRecvAppInfo.stKey = stAppInfoKey;
        stRecvAppInfo.lLastTime = lCurTime;
        stRecvAppInfo.strIP1 = stNode.strNic1Addr;
        stRecvAppInfo.strIP2 = stNode.strNic2Addr;

        m_mapRecvAppInfo[stAppInfoKey] = stRecvAppInfo;     //< 此处无需判断是否重复，NodeInfoMng中已经判断了
        LOGINFO("远程节点信息管理缓冲添加记录:域[%d],应用[%d],节点[%s]", stAppInfoKey.nDomainId,
                stAppInfoKey.nAppId, stAppInfoKey.strNodeName.c_str());

    }

    return iotSuccess;
}

/* @brief 检查接收到的应用的冗余状态信息，判断是否有超时的 */
int iot_sys::CRemoteAppInfoMng::checkRemoteBuffer()
{
    boost::mutex::scoped_lock lock(m_objRecvBufMutex);

    bool bNetworkIsActive = false;
    SNetworkState stNetSta;
    if(iotSuccess == m_ptrNetworkCheck->getLocalNetStatus(stNetSta))
    {
        bNetworkIsActive = (stNetSta.bIP1State || stNetSta.bIP2State);
    }

    int64 lCurTime = getMonotonicMsec();

    for (AppKeyToHeartbeatMAP::iterator pNode = m_mapRecvAppInfo.begin(); pNode != m_mapRecvAppInfo.end(); ++pNode)
    {
        SAppHeartbeatInfo &stAppInfo = pNode->second;
        /* @brief 检查冗余相关状态是否发生变化 */
        if(!stNetSta.bIP1State && stAppInfo.bIP1Active)
        {
            stAppInfo.bIP1Active = false;
            stAppInfo.bNetworkStateChanged = true;
        }

        if(!stNetSta.bIP2State && stAppInfo.bIP2Active)
        {
            stAppInfo.bIP2Active = false;
            stAppInfo.bNetworkStateChanged = true;
        }

        if (stAppInfo.bRedundancyStateChanged || stAppInfo.bNetworkStateChanged)
        {
            m_ptrNodeInfoMng->updateAppRedundancyInfo(stAppInfo);

            stAppInfo.bRedundancyStateChanged = false;
            stAppInfo.bNetworkStateChanged = false;
        }

        /* @brief 判断是否超时 */
        if(bNetworkIsActive && !m_bLastNetworkIsActive)
        {
            //< 如果网络恢复（上一次网络不正常，这次正常），则重新计时，否则可能产生以下问题：
            //< 网络一恢复（能ping通网关），消息总线尚未连接，尚未收到其他机器心跳，认为域中无主，但实际上可能有主
            //< 下面判断已超时，通过heartbeatTimeout()设置nTimeoutCount大于xml配置中的redundancy_stable_threshold
            //< 本机可能会马上升主，当消息总线连接，心跳交互完成，又进行双主决策。
            //< 双主决策中按节点顺序，判断靠前的为主，可能抢走了原来的主，可能造成部分数据丢失（比如告警丢失）
            //< todo 双主决策可以完善，用持有时间作为优先级，避免不必要的抢主
            stAppInfo.lLastTime = lCurTime;
        }
        else
        {
            int64 lTimeInterval = lCurTime - stAppInfo.lLastTime;
            if (lTimeInterval > m_nRecvHeartbeatTimeoutMsec)
            {
                /* @brief 为避免超时时一直打印日志，仅在上次状态不为超时状态时才打印 */
                if (stAppInfo.bActive || stAppInfo.bMaster || stAppInfo.bHasMaster)
                {
                    LOGERROR("远程节点心跳超时.域[%d],应用[%d],节点[%s],当前时间[%" PRId64 "],最后更新时间[%" PRId64 "]",
                             stAppInfo.stKey.nDomainId, stAppInfo.stKey.nAppId,
                             stAppInfo.stKey.strNodeName.c_str(), lCurTime, stAppInfo.lLastTime);
                }

                /* @brief 心跳超时，将本应用的冗余状态修改为不可用状态 */
                stAppInfo.bActive = false;
                stAppInfo.bMaster = false;
                stAppInfo.bSlave = false;
                stAppInfo.bHasMaster = false;
                stAppInfo.bIP1Active = false;
                stAppInfo.bIP2Active = false;

                int nTimeoutCount = 0;
                if (bNetworkIsActive)
                {
                    //TODO:超时次数的计算需要再考虑一下，SLocalNodeInfo中增加一个变量，还是用间隔时间除一下，取商
                    nTimeoutCount = static_cast<int>(lTimeInterval / m_nCheckPeriodMsec);
                }
                else
                {
                    /* @brief 持续次数设置为0，避免网络恢复时，对系统造成冲击 */
                    stAppInfo.lLastTime = lCurTime;
                    nTimeoutCount = 0;
                }

                m_ptrNodeInfoMng->heartbeatTimeout(stAppInfo, nTimeoutCount);
            }
        }
    }

    m_bLastNetworkIsActive = bNetworkIsActive;

    return iotSuccess;
}

/* @brief 设置冗余切换失败标识 */
int iot_sys::CRemoteAppInfoMng::setSwitchFailedFlag(const SAppInfoKey &stKey)
{
    if (stKey.nAppId == CN_AppId_All)
    {
        for (size_t i = 0; i < m_vecLocalAppDeploy.size(); ++i)
        {
            SAppInfoKey stKeyTemp = stKey;
            stKeyTemp.nAppId = m_vecLocalAppDeploy[i].nAppId;
            if (iotSuccess != setSwitchFailedFlagByKey(stKeyTemp))
            {
                return iotFailed;
            }
        }
    }
    else
    {
        return setSwitchFailedFlagByKey(stKey);
    }

    return iotSuccess;
}

//TODO:可以考虑直接更新nodemngbuf，而不是通过本类的线程扫描然后更新
/* @brief 更新接收到的应用冗余心跳信息 */
int iot_sys::CRemoteAppInfoMng::updateRecvHeartbeatInfo(const SAppHeartbeatInfo &stHeartbeat)
{
    boost::mutex::scoped_lock lock(m_objRecvBufMutex);
    AppKeyToHeartbeatMAP::iterator pIter = m_mapRecvAppInfo.find(stHeartbeat.stKey);
    if (pIter != m_mapRecvAppInfo.end())
    {
        //         LOGDEBUG("接收到心跳信息.域[%d],应用[%d],节点[%s],可用[%d],为主[%d],为备[%d],有主[%d],切换失败[%d]",
        //                  stHeartbeat.stKey.nDomainId, stHeartbeat.stKey.nAppId, stHeartbeat.stKey.strNodeName.c_str(),
        //                  stHeartbeat.bActive, stHeartbeat.bMaster, stHeartbeat.bSlave, stHeartbeat.bHasMaster, stHeartbeat.bSwitchNG);

        SAppHeartbeatInfo &stAppInfo = pIter->second;

        /* @brief 更新相关标识 */
        if (stAppInfo.bActive != stHeartbeat.bActive ||
            stAppInfo.bMaster != stHeartbeat.bMaster ||
            stAppInfo.bSlave != stHeartbeat.bSlave ||
            stAppInfo.bHasMaster != stHeartbeat.bHasMaster ||
            stAppInfo.bSwitchNG != stHeartbeat.bSwitchNG)
        {
            LOGINFO("节点状态发生变化.域[%d],应用[%d],节点[%s],可用[%d->%d],为主[%d->%d],为备[%d->%d],有主[%d->%d],切换失败[%d->%d]",
                    stAppInfo.stKey.nDomainId, stAppInfo.stKey.nAppId, stAppInfo.stKey.strNodeName.c_str(),
                    stAppInfo.bActive, stHeartbeat.bActive, stAppInfo.bMaster, stHeartbeat.bMaster,
                    stAppInfo.bSlave, stHeartbeat.bSlave, stAppInfo.bHasMaster, stHeartbeat.bHasMaster,
                    stAppInfo.bSwitchNG, stHeartbeat.bSwitchNG);

            stAppInfo.bActive = stHeartbeat.bActive;
            stAppInfo.bMaster = stHeartbeat.bMaster;
            stAppInfo.bSlave = stHeartbeat.bSlave;
            stAppInfo.bHasMaster = stHeartbeat.bHasMaster;
            stAppInfo.bSwitchNG = stHeartbeat.bSwitchNG;

            stAppInfo.bRedundancyStateChanged = true;
            stAppInfo.nRedundancyStatePersistCount = 1;

        }
        else
        {
            stAppInfo.nRedundancyStatePersistCount =
                (std::min)(stAppInfo.nRedundancyStatePersistCount + 1, CN_MaxPersistCount);

            /**
            @brief 更新节点信息管理缓冲区中的持续次数
                   加入此判断可以减少对m_ptrNodeInfoMng的更新次数，因为使用nRedundancyStatusPersistCount时都会先判断bActive
                   为了逻辑统一，不进行过滤
            */
            m_ptrNodeInfoMng->increasePersistCount(stAppInfo.stKey);
            //             if (!stAppInfo.bActive)
            //             {
            //                 m_ptrNodeInfoMng->increasePersistCount(stAppInfo.stKey);
            //             }
        }

        /* @brief 更新访问信息字段 */
        if (stAppInfo.bIP1Active != stHeartbeat.bIP1Active || stAppInfo.bIP2Active != stHeartbeat.bIP2Active)
        {
            bool bIP1Active = stHeartbeat.bIP1Active;
            bool bIP2Active = stHeartbeat.bIP2Active;

            SNetworkState stNetSta;
            if(iotSuccess == m_ptrNetworkCheck->getLocalNetStatus(stNetSta))
            {
                //为了解决如下情况：本机A、B网都正常，接收者只有A网正常，但是在接收者的内存中记录了AB网都正常
                //调整为：本机某网不正常时，不管对端是否正常，以本机为准
                //为了降低正常情况下此处访问网络状态的次数，没有每次都获取网络状态，而通过与checkRemoteBuffer配合完成
                if(!stNetSta.bIP1State && bIP1Active)
                {
                    bIP1Active = false;
                }

                if(!stNetSta.bIP2State && bIP2Active)
                {
                    bIP2Active = false;
                }
            }

            if(stAppInfo.bIP1Active != bIP1Active || stAppInfo.bIP2Active == bIP2Active)
            {
                stAppInfo.bIP1Active = stHeartbeat.bIP1Active;
                stAppInfo.bIP2Active = stHeartbeat.bIP2Active;
                stAppInfo.bNetworkStateChanged = true;
            }
        }

        /* @brief 更新心跳时间戳 */
        stAppInfo.lLastTime = getMonotonicMsec();

        if (stAppInfo.bRedundancyStateChanged || stAppInfo.bNetworkStateChanged)
        {
            m_ptrNodeInfoMng->updateAppRedundancyInfo(stAppInfo);

            stAppInfo.bRedundancyStateChanged = false;
            stAppInfo.bNetworkStateChanged = false;
        }
    }
    else
    {
        LOGERROR("记录不存在.域[%d],应用[%d],节点[%s]", stHeartbeat.stKey.nDomainId,
                 stHeartbeat.stKey.nAppId, stHeartbeat.stKey.strNodeName.c_str());
        return iotFailed;
    }

    return iotSuccess;
}

/* @brief 设置指定应用的冗余切换失败标识 */
int iot_sys::CRemoteAppInfoMng::setSwitchFailedFlagByKey(const SAppInfoKey &stKey)
{
    boost::mutex::scoped_lock lock(m_objRecvBufMutex);
    AppKeyToHeartbeatMAP::iterator pIter = m_mapRecvAppInfo.find(stKey);
    if (pIter != m_mapRecvAppInfo.end())
    {
        SAppHeartbeatInfo &stAppInfo = pIter->second;
        stAppInfo.bSwitchNG = true;
        LOGINFO("设置应用切换失败标识.域[%d],应用[%d],节点[%s]", stKey.nDomainId, stKey.nAppId, stKey.strNodeName.c_str());
        return iotSuccess;
    }
    else
    {
        LOGERROR("记录不存在.域[%d],应用[%d],节点[%s]", stKey.nDomainId, stKey.nAppId, stKey.strNodeName.c_str());
        return iotFailed;
    }
}