/**
  * @RDE_HEADER@
  * Handler for CheckmkHandlerScheduleCheck
  * $Id$
  * $HeadURL$
  * $Author$
  * Created by Norbert Thoden, 2022-11-30
  */

#include "checkmk_handler_schedule_check.h"

#include <QTimer>
#include <QHostAddress>
#include <QDateTime>

namespace ComponentMonitor
{

CheckmkHandlerScheduleCheck::CheckmkHandlerScheduleCheck(const std::shared_ptr<DdsHandler> &ddsHandler)
  : QObject()
  , TriggerUpdateRequestHandler(ddsHandler->fts())
  , m_socket(new QTcpSocket(this))
  , m_ddsHandler(ddsHandler)
  , m_logger(getLogger("CheckmkHandlerScheduleCheck"))
{
  TRACE_LOG(m_logger) << LOGFUNCTION << " START";
  TRACE_LOG(m_logger) << LOGFUNCTION << " END";
}

CheckmkHandlerScheduleCheck::~CheckmkHandlerScheduleCheck()
{
  TRACE_LOG(m_logger) << LOGFUNCTION << " START";
  if (m_timer)
    m_timer->stop();
  delete m_socket;
  TRACE_LOG(m_logger) << LOGFUNCTION << " END";
}

bool CheckmkHandlerScheduleCheck::initialize(const QString &checkMkServerHostname, int checkMkServerPort)
{
  NOTICE_LOG(m_logger) << LOGFUNCTION << " START"
                       << " , hostname=" << checkMkServerHostname
                       << " , port=" << checkMkServerPort;

  DEBUG_LOG(m_logger) << LOGFUNCTION << " ddsHandler referenced";

  m_checkMkHost  = checkMkServerHostname;
  m_checkMkPort  = checkMkServerPort;

  if (!m_timer)
  {
    m_timer = new QTimer(this);
    m_timer->setSingleShot(true);
    connect(m_timer, &QTimer::timeout, this, &CheckmkHandlerScheduleCheck::onTimeout);
  }

  connect(m_socket, &QTcpSocket::stateChanged, this, &CheckmkHandlerScheduleCheck::onStateChanged);
  connect(m_socket, QOverload<QAbstractSocket::SocketError>::of(&QAbstractSocket::error),
          this, &CheckmkHandlerScheduleCheck::onSocketError);

  connect(m_socket, &QTcpSocket::connected,
          this, &CheckmkHandlerScheduleCheck::onConnected);

  INFO_LOG(m_logger) << LOGFUNCTION << " END";
  return true;
}

void CheckmkHandlerScheduleCheck::run(int timoutMsec)
{
  INFO_LOG(m_logger) << LOGFUNCTION << " START, timoutMsec=" << timoutMsec;
  m_timer->start(timoutMsec);
  INFO_LOG(m_logger) << LOGFUNCTION << " END";
}

void CheckmkHandlerScheduleCheck::stop()
{
  INFO_LOG(m_logger) << LOGFUNCTION << " START";
  m_timer->stop();
  INFO_LOG(m_logger) << LOGFUNCTION << " END";
}

void CheckmkHandlerScheduleCheck::onTimeout()
{
  if (m_socket->state() == QAbstractSocket::SocketState::ConnectedState)
  {
    writeScheduleUpdateRequest();
  } else {
    doConnect();
  }
}

bool CheckmkHandlerScheduleCheck::doConnect()
{
  INFO_LOG(m_logger) << LOGFUNCTION << " START, (int)m_socket->state()=" << (int)m_socket->state();

  // (for 'COMMAND [%1] SCHEDULE_FORCED_HOST_CHECK...' the socket connection should not be closed)
  // But maybe the CheckMk-Server ist restarted:

  m_socket->connectToHost(m_checkMkHost, m_checkMkPort);
  if (!m_socket->waitForConnected(5000))
  {
    ERROR_LOG(m_logger) << LOGFUNCTION << " Could not (re)open tcp destination " << m_checkMkHost << ":" << m_checkMkPort << ", error: " << m_socket->errorString();
    return false;
  }
  INFO_LOG(m_logger) << LOGFUNCTION << " (Re)openend tcp destination " << m_checkMkHost << ":" <<  m_checkMkPort;

  INFO_LOG(m_logger) << LOGFUNCTION << " END";
  return true;
}

void CheckmkHandlerScheduleCheck::addScheduleCheckHostnames(const QStringList &hostnames)
{
  INFO_LOG(m_logger) << LOGFUNCTION << " hostnames: " << hostnames.join(QStringLiteral(";"));
  m_scheduleCheckHostnames += hostnames;
}

bool CheckmkHandlerScheduleCheck::writeScheduleUpdateRequest()
{
  DEBUG_LOG(m_logger) << LOGFUNCTION
                      << " state " << (int)m_socket->state()
                      << ", isOpen " << m_socket->isOpen();

  if (!m_socket->isOpen() || (m_socket->state() != QAbstractSocket::SocketState::ConnectedState))
  {
    ERROR_LOG(m_logger) << LOGFUNCTION << " socket not open or connected "
                        << " host/port: " << m_checkMkHost << ":" <<  m_checkMkPort;
    return false;
  }

  if (m_scheduleCheckHostnames.isEmpty())
    return false;

  // avoid duplicates:
#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
  const QSet<QString> hosts = QSet<QString>::fromList(m_scheduleCheckHostnames);
#else
  const QSet<QString> hosts(m_scheduleCheckHostnames.begin(), m_scheduleCheckHostnames.end());
#endif  // QT_VERSION

  int bWrittenAll = 0;
  for (const QString &hostname : qAsConst(hosts))
  {
    qint64 now = QDateTime::currentSecsSinceEpoch();
    // CheckMK is is configured with <HOSTNAME> -> toUpper()
    const QString cmd = QString(QStringLiteral("COMMAND [%1] SCHEDULE_FORCED_HOST_CHECK;%2;%3")).arg(now).arg(hostname.toUpper()).arg(now);
    DEBUG_LOG(m_logger) << LOGFUNCTION << " cmd= '" << cmd << "'";
    int bWritten = m_socket->write(cmd.toUtf8()) + m_socket->write("\n\n");
    DEBUG_LOG(m_logger) << LOGFUNCTION << " bWritten= " << bWritten;
    bWrittenAll += bWritten;
  } // for

  INFO_LOG(m_logger) << LOGFUNCTION << " bWrittenAll= " << bWrittenAll;

  // avoid scheduling more than once -> clear
  m_scheduleCheckHostnames.clear();

  //
  // avoid hanging application, since slot (CheckmkHandler::onImmediateGetStateRequested
  // most likely has to reconnect...
  QTimer::singleShot(100, this, [this](){
    emit newCheckScheduled();
  });

  return true;
}

void CheckmkHandlerScheduleCheck::onConnected()
{
  writeScheduleUpdateRequest();
}

void CheckmkHandlerScheduleCheck::onStateChanged(const QAbstractSocket::SocketState &newState)
{
  DEBUG_LOG(m_logger) << LOGFUNCTION << " SocketState changed to: " << newState;
  qInfo() << " CheckmkHandlerScheduleCheck:  SocketState changed to: " << newState;
}


void CheckmkHandlerScheduleCheck::onSocketError(const QAbstractSocket::SocketError &socketError)
{
  qCritical() << "CheckmkHandlerScheduleCheck: Error occured: " << socketError;
}

void CheckmkHandlerScheduleCheck::onTriggerUpdateRequest(const rti::core::SampleIdentity &cookie, const TriggerUpdate &request)
{
  INFO_LOG(m_logger) << LOGFUNCTION << " request=" << request;
  DEBUG_LOG(m_logger) << LOGFUNCTION << " m_socket->state=" << (int)m_socket->state();


//  if ((m_socket->state() != QAbstractSocket::SocketState::ConnectedState))
//  {
//    ERROR_LOG(m_logger) << LOGFUNCTION << " not connected";
//    Core::FunctionReplyObject ret(0); // no request.id()
//    ret.setId(-1);
//    ret.setStr(tr_lts("dds", "No Connection to CheckMK"));
//    if (m_ddsHandler && m_ddsHandler->fts())
//      m_ddsHandler->fts()->triggerUpdateReply(cookie, ret);
//    return;
//  }

  const std::vector< std::string >& hostnames = request.hostnames();

  QStringList sl;
  sl.reserve(hostnames.size());

  QString temp;
  for (const std::string &str : qAsConst(hostnames))
  {
    temp = QString::fromStdString(str);
    if (!sl.contains(temp))
      sl.push_back(temp);
  } // for

  // add to list
  addScheduleCheckHostnames(sl);


  // updateLastCheckTimeDirect :
  // BEFORE writeScheduleUpdateRequest to avoid race condition!

  const qint64 now = QDateTime::currentSecsSinceEpoch();
  emit updateLastCheckTimeDirect(sl, now);

  // : updateLastCheckTimeDirect


  Core::FunctionReplyObject ret(0); // no request.id()
  const bool connected = m_socket->state() == QAbstractSocket::SocketState::ConnectedState;
  if (connected)
  {
    bool writeOk = writeScheduleUpdateRequest();
    if (!writeOk)
    {
      ret.setId(-1);
      ret.setStr(tr_lts("dds", "WriteError on CheckMk"));
    }
  } else {
    // GUEZE-1653 MsgBox 'cmd queued due to lost connection to CheckMk' vermeiden
    WARNING_LOG(m_logger) << LOGFUNCTION << " socket not connected"
                          << ", (int)m_socket->state()=" << (int)m_socket->state()
                          << ", destination " << m_checkMkHost << ":" << m_checkMkPort
                          << ",  -> queued cmd/request: " << request;
    // ret.setId(-1);
    // ret.setStr(tr_lts("dds", "cmd queued due to lost connection to CheckMk"));
  }

  INFO_LOG(m_logger) << LOGFUNCTION << " m_ddsHandler = " << m_ddsHandler;
  INFO_LOG(m_logger) << LOGFUNCTION << " m_ddsHandler->fts() = " << m_ddsHandler->fts();

  if (m_ddsHandler && m_ddsHandler->fts())
    m_ddsHandler->fts()->triggerUpdateReply(cookie, ret);
  else
    ERROR_LOG(m_logger) << LOGFUNCTION << " no m_ddsHandler or m_ddsHandler->fts()";


  if (!connected)
    doConnect();

  return;
}


} // namespace ComponentMonitor