/**
  * Handler for all exercise objects
  * $Id$
  * $HeadURL$
  * $Author$
  * Created by Hanna E. Rathje, SLSE, 2015-09-03
  */

#include "handler_exercise.h"
#include "exm_db.h"
#include "handler_exercise_phase.h"
#include "main_handler.h"
#include "object_exercise.h"
#include "settings.h"

//#include <QPixmap>
#include <QTimer>
#include <vector>

#include <LtsUtilsCore/dds_vector_to_pixmap.h>
#include <DBAdministration/exercise_table_generator.h>
#include <ngldb/dbtransaction.h>
#include <LtsUtilsCore/dds_vector.h>

namespace ExerciseManagement
{

HandlerExercise::HandlerExercise(MainHandler *mainHandler,
                                 const std::shared_ptr<DdsHandler> &ddsHandler,
                                 const std::shared_ptr<DatabaseInterface> &db,
                                 const std::shared_ptr<DBAdministration::ExerciseTableGenerator> &exTableGenerator,
                                 QObject *parent)
  : QObject(parent)
  , Interface::Fts::ExerciseCreateRequestHandler(ddsHandler->fts())
  , Interface::Fts::ExerciseModifyRequestHandler(ddsHandler->fts())
  , Interface::Fts::ExerciseRemoveRequestHandler(ddsHandler->fts())
  , Interface::Fts::ExerciseImageModifyRequestHandler(ddsHandler->fts())
  , Interface::Fts::GetExerciseImageRequestHandler(ddsHandler->fts())
  , m_mainHandler(mainHandler)
  , m_ddsHandler(ddsHandler)
  , m_db(db)
  , m_exTblGen(exTableGenerator)
  , m_startupExerciseTimer(new QTimer(this))
  , m_logger(getLogger("HandlerExercise"))
{
  //m_imageCache.setMaxCost(15);
  m_startupExerciseTimer->setSingleShot(false);
  m_startupExerciseTimer->setInterval(2000);
  connect(m_startupExerciseTimer, &QTimer::timeout, this, &HandlerExercise::onStartNextExercise);
}

HandlerExercise::~HandlerExercise()
{
  qDeleteAll(m_exeObjMap);
}

bool HandlerExercise::init()
{
  DEBUG_LOG(m_logger) << "Finish Initialise DbAdministration (dba) ";
  INFO_LOG(m_logger) << "Data available for services: "  << m_exTblGen->getAvailableServices().join(QLatin1Char(','));

  QVector<Database::ExmExercise> dataVec;
  // read all exercises from database
  if (!m_db->select(dataVec))
  {
    ERROR_LOG(m_logger) << "Error reading data from database!";
    return true;
  }

  QVector<QPair<int, ExerciseState>> exerciseStates;
  exerciseStates.reserve(dataVec.size());
  // create exercise objects
  for (const Database::ExmExercise &data : qAsConst(dataVec))
  {
    ObjectExercise *ifs(new ObjectExercise(m_ddsHandler, m_db, m_exTblGen, this));
    Core::FunctionReplyObject ret = ifs->createObject(data);
    if (ret.error())
    {
      delete ifs;
      ERROR_LOG(m_logger) << ret();
      return false;
    }
    m_exeObjMap.insert(ifs->id(), ifs);
    exerciseStates.push_back({ifs->id(), ifs->data().exerciseStateId});
  }
  DEBUG_LOG(m_logger) << "m_exeObjMap.size() = " << m_exeObjMap.size();

  // make sure to start the important exercises first
  std::sort(exerciseStates.begin(), exerciseStates.end(),
            [](const QPair<int, ExerciseState> &a, const QPair<int, ExerciseState> &b)
  {
    if (a.second == b.second)
      return a.first < b.first;
    if (a.second == ExerciseState::Started)
      return true;
    if (b.second == ExerciseState::Started)
      return false;
    if (a.second == ExerciseState::Paused)
      return true;
    if (b.second == ExerciseState::Paused)
      return false;
    if (a.second == ExerciseState::Created)
      return true;
    if (b.second == ExerciseState::Created)
      return false;
    return a.first < b.first;
  });

  for (const auto &p : qAsConst(exerciseStates))
    m_exercisesToStart.enqueue(p.first);
  m_startupExerciseTimer->start();

  return true;
}

ObjectExercise *HandlerExercise::getExerciseById(qint32 id) const
{
  return m_exeObjMap.value(id);
}

bool HandlerExercise::startGroupRequest(const ServiceManagement::GroupRequest &req)
{
  return m_ddsHandler->scmFtc()->startGroupRequest(req, this);
}

void HandlerExercise::onStartNextExercise()
{
  if (m_exercisesToStart.isEmpty())
  {
    NOTICE_LOG(m_logger) << "onStartNextExercise no more exercises to start";
    m_startupExerciseTimer->stop();
    delete m_startupExerciseTimer;
    m_startupExerciseTimer = nullptr;
    return;
  }
  m_startupExerciseTimer->setInterval(m_startupExerciseTimer->interval() + 1000);
  while (true)
  {
    int exId = m_exercisesToStart.dequeue();
    auto *objEx = m_exeObjMap.value(exId);
    if (!objEx)
    {
      WARNING_LOG(m_logger) << "Trying to start exercise with id " << exId << " but could not find a handler !?";
      continue;
    }
    NOTICE_LOG(m_logger) << "Init state machine for exercise " << exId << " (" << objEx->data().name << ")";
    objEx->initStateMachine();
    break;
  }
  m_startupExerciseTimer->start();
}

bool HandlerExercise::hasError(const Core::FunctionReplyObject &replyObject, ObjectExercise *ifs) const
{
  if (replyObject.error())
  {
    delete ifs;
    ERROR_LOG(m_logger) << replyObject();
    return true;
  }
  return false;
}

template<typename T>
static Database::ExmExercise copyBaseData(const T &in)
{
  Database::ExmExercise newData;

  // exerciseState defined in ObjectExercise
  newData.id               = in.id();
  newData.name             = QString::fromStdString(in.name());
  newData.beginTime        = QDateTime::fromMSecsSinceEpoch(in.beginTime());
  newData.endTime          = QDateTime::fromMSecsSinceEpoch(in.endTime());
  newData.startTime        = QDateTime::fromMSecsSinceEpoch(in.startTime());
  newData.stopTime         = QDateTime::fromMSecsSinceEpoch(in.stopTime());
  newData.trainingAreaId   = in.trainingAreaId();
  if (in.radioGroupId().is_set())
    newData.radioGroupId     = in.radioGroupId().get();
  newData.symbolFillTypeId = in.symbolFillTypeId();
  newData.linkedExerciseId = in.linkedExerciseId();
  newData.defaultTimeZone  = QLatin1Char(in.defaultTimeZone());
  newData.sendToWms        = in.sendToWMS();
  newData.transferred      = in.transferred();
  newData.hasHlaInterface  = in.hasHlaInterface();
  newData.forces           = QString::fromStdString(in.forces());
  newData.description      = QString::fromStdString(in.description());

  return newData;
}

void HandlerExercise::onExerciseCreateRequest(const rti::core::SampleIdentity &cookie,
                                              const ExerciseManagement::ExerciseCreateRequest &request)
{
  auto ret = exerciseCreateRequest(request);
  if (ret.error())
  {
    WARNING_LOG(m_logger) << ret();

  }
  m_ddsHandler->fts()->exerciseCreateReply(cookie, ret);
}

Core::FunctionReplyObject HandlerExercise::exerciseCreateRequest(const ExerciseCreateRequest &request)
{
  DEBUG_LOG(m_logger) << "onExerciseCreateRequest: " << request;

  Database::ExmExercise newData(copyBaseData(request));
  newData.linkedExerciseId = 0;

  DBTransaction trans(m_db->database());

  int iCnt = 0;
  QSet<int> linkedExerciseIds;
  for (const ObjectExercise *ex : qAsConst(m_exeObjMap))
  {
    const auto state = ex->exerciseState();

    // ignore linked exercises
    if (linkedExerciseIds.contains(ex->id()))
      continue;
    if (ex->linkedExerciseId() != 0)
      linkedExerciseIds += ex->linkedExerciseId();

    if (state == ExerciseState::Created)
      ++iCnt;
  }

  if (iCnt >= Settings::maxPreparedExercises())
    return Core::FunctionReplyObject(tr_lts("dds", "Can not create exercise - only %1 prepared exercise(s) allowed")).arg(Settings::maxPreparedExercises());

  ObjectExercise *ifs(new ObjectExercise(m_ddsHandler, m_db, m_exTblGen, this));
  Core::FunctionReplyObject ret = ifs->createObject(newData, true);

  if (hasError(ret, ifs))
  {
    // remove failed create exercise request from DDS bus (id = 0)
    ERROR_LOG(m_logger) << "CreateExercise failed, removing request from dds";
    m_ddsHandler->dts()->removeExerciseByKey(0);
    return ret;
  }

// Create default phase for exercise
  ExercisePhaseCreateRequest phaseData;
  phaseData.name(tr("Phase 1").toStdString());
  phaseData.description(tr("Default exercise phase").toStdString());
  phaseData.beginTime(request.beginTime());
  phaseData.endTime(request.endTime());
  phaseData.exerciseId(ifs->id());
  ret = m_mainHandler->exercisePhaseHandler()->exercisePhaseCreateRequest(phaseData);

  if (hasError(ret, ifs))
  {
    ERROR_LOG(m_logger) << "CreateExercisePhase failed, removing requests from dds";
    m_ddsHandler->dts()->removeExercisePhaseByKey(0);
    m_ddsHandler->dts()->removeExerciseByKey(0);
    return ret;
  }

  // Set default phase as active in exercise
  newData = ifs->data();
  newData.activePhaseId = ret.id();
  ret = ifs->updateObject(newData);

  if (hasError(ret, ifs))
  {
    ERROR_LOG(m_logger) << "Set active phase failed, removing requests from dds";
    m_ddsHandler->dts()->removeExercisePhaseByKey(0);
    m_ddsHandler->dts()->removeExerciseByKey(0);
    return ret;
  }

  ifs->initStateMachine();

  m_exeObjMap.insert(ifs->id(), ifs);
  ret.setId(ifs->id());  // set the returned id to the new exercise id
  trans.commit();

  return Core::FunctionReplyObject(ifs->id());
}

void HandlerExercise::onExerciseModifyRequest(const rti::core::SampleIdentity &cookie,
                                              const ExerciseManagement::ExerciseModifyRequest &request)
{
  auto ret = exerciseModifyRequest(request);
  if (ret.error())
    WARNING_LOG(m_logger) << ret();
  m_ddsHandler->fts()->exerciseModifyReply(cookie, ret);
}

Core::FunctionReplyObject HandlerExercise::exerciseModifyRequest(const ExerciseModifyRequest &request)
{
  INFO_LOG(m_logger) << "onExerciseModifyRequest: " << request;

  ObjectExercise *ifs = m_exeObjMap.value(request.id());
  if (ifs == nullptr)
    return Core::FunctionReplyObject(request.id(), tr_lts("dds", "Exercise with id %1 not found")).arg(request.id());

  if (ifs->exerciseState() == ExerciseState::Created &&
      request.newState()   == ExerciseState::Started)
  {
    // check if the running exercise has CnrChannels, which are already included in the global CnrConfigs
    QStringList doubleChannelNames = doubleChannels(request.id(), 0);

    if (!doubleChannelNames.isEmpty())
    {
      std::sort(doubleChannelNames.begin(), doubleChannelNames.end());

      return Core::FunctionReplyObject(request.id(), tr_lts("dds", "The following channel(s) are already planned in the global CnrConfig: %1")).arg(doubleChannelNames.join(QLatin1String(", ")));
    }

    // check if another exercise is already running, only allow N active exercises in parallel
    // check if another running exercise has HLA interface on.
    int iCntRunningExercises = 0;
    QSet<int> linkedExerciseIds;

    for (const ObjectExercise *ex : qAsConst(m_exeObjMap))
    {
      const auto state = ex->exerciseState();

      if (ex->linkedExerciseId() == request.id())
      {
        doubleChannelNames = doubleChannels(ex->id(), 0);

        if (!doubleChannelNames.isEmpty())
        {
          std::sort(doubleChannelNames.begin(), doubleChannelNames.end());

          return Core::FunctionReplyObject(request.id(), tr_lts("dds", "The following channel(s) are planned in the global CnrConfig and the linked exercise %1: %2")).arg(ex->name()).arg(doubleChannelNames.join(QLatin1String(", ")));
        }
      }

      // ignore linked exercises
      if (linkedExerciseIds.contains(ex->id()))
        continue;
      if (ex->linkedExerciseId() != 0)
      {
        linkedExerciseIds += ex->linkedExerciseId();

      }

      if (state == ExerciseState::Started ||
          state == ExerciseState::Paused)
        ++iCntRunningExercises;
    }
    if (iCntRunningExercises >= Settings::maxStartedExercises())
      return Core::FunctionReplyObject(request.id(),
                                       tr_lts("dds", "Can not start exercise - only %1 started exercise(s) allowed")).arg(Settings::maxStartedExercises());
  }

  if (request.newState() == ExerciseState::Stopped)
  {
    int iCnt = 0;
    for (const ObjectExercise *ex : qAsConst(m_exeObjMap))
    {
      const auto state = ex->exerciseState();
      if (ex->id() != request.id() && state == ExerciseState::Stopped)
        ++iCnt;
    }
    if (Settings::maxStoppedExercises() > 0 && iCnt >= Settings::maxStoppedExercises())
      return Core::FunctionReplyObject(request.id(),
                                       tr_lts("dds", "Can not stop exercise - there are %1 stopped exercise(s) from maximal %2 allowed")).arg(iCnt).arg(Settings::maxStoppedExercises());
  }

  if (request.hasHlaInterface() && (request.newState() == ExerciseState::Started ||
                                    request.newState() == ExerciseState::Paused))
  {
    int iCnt = 0;
    for (const ObjectExercise *ex : qAsConst(m_exeObjMap))
    {
      if (ex->id() != request.id() && ex->data().hasHlaInterface && (ex->exerciseState() == ExerciseState::Started ||
                                                                     ex->exerciseState() == ExerciseState::Paused))
        ++iCnt;
    }
    if (iCnt >= Settings::maxHlaExercises())
      return Core::FunctionReplyObject(request.id(),
                                       tr_lts("dds", "Can not modify exercise - only %1 running exercise(s) with HLA allowed")).arg(Settings::maxHlaExercises());
  }

  if (ifs->exerciseState() != ExerciseManagement::ExerciseState::Created)
  {
    if (request.linkedExerciseId() != ifs->linkedExerciseId())
      return Core::FunctionReplyObject(request.id(), tr_lts("dds", "Can not change linked exercise when exercise is already started"));
    if (request.sendToWMS() == false && ifs->data().sendToWms == true)
      return Core::FunctionReplyObject(request.id(), tr_lts("dds", "Exercise is already visible in WMS - can not reset this option"));
  }

  if (request.linkedExerciseId() == 0)
  {
    if (ifs->linkedExerciseId() != 0)
    {
      ObjectExercise *linked = m_exeObjMap.value(ifs->linkedExerciseId());
      if (linked != nullptr)
      {
        if (!linked->setLinkedExerciseId(0))
          return Core::FunctionReplyObject(request.id(), tr_lts("dds", "Can not update unlinked exercise"));
      }
    }
  }
  else // request.linkedExercise() != 0
  {
    ObjectExercise *linked = m_exeObjMap.value(request.linkedExerciseId());
    if (linked == nullptr)
      return Core::FunctionReplyObject(request.id(), tr_lts("dds", "Can not find linked exercise with id %1")).arg(request.linkedExerciseId());

    if (linked->linkedExerciseId() != request.id())
    {
      if (linked->linkedExerciseId() != 0)
        return Core::FunctionReplyObject(request.id(), tr_lts("dds", "The exercise to link already has another linked exercise"));

      // own state is checked above
      if (linked->exerciseState() != ExerciseManagement::ExerciseState::Created)
        return Core::FunctionReplyObject(request.id(), tr_lts("dds", "Can not link to an already running exercise"));

      QStringList doubleChannelNames = doubleChannels(request.id(), request.linkedExerciseId());

      if (!doubleChannelNames.isEmpty())
      {
        std::sort(doubleChannelNames.begin(), doubleChannelNames.end());

        return Core::FunctionReplyObject(request.id(), tr_lts("dds", "Linked exercise has overlapping CnrConfig(s) for channel(s): %1")).arg(doubleChannelNames.join(QLatin1String(", ")));
      }

      if (!linked->setLinkedExerciseId(request.id()))
        return Core::FunctionReplyObject(request.id(), tr_lts("dds", "Can not update linked exercise"));
    }
    if (linked->sendToWms() != request.sendToWMS())
    {
      if (!linked->setSendToWms(request.sendToWMS()))
        return Core::FunctionReplyObject(request.id(), tr_lts("dds", "Can not update linked exercise"));
    }
  }

  DEBUG_LOG(m_logger) << "Linked exercise: " << request.linkedExerciseId()
                      << ", state: " << ifs->exerciseState()
                      << ", new: " << request.newState();
  if (request.linkedExerciseId() != 0 && ifs->exerciseState() != request.newState())
  {
    if (request.newState() == ExerciseManagement::ExerciseState::Started ||
        request.newState() == ExerciseManagement::ExerciseState::Stopped)
    {
      ObjectExercise *ifsLinked = m_exeObjMap.value(request.linkedExerciseId());
      if (!ifsLinked)
        WARNING_LOG(m_logger) << "Linked exercise with id " << request.linkedExerciseId() << " not found!";
      else
      {
        if (ifsLinked->exerciseState() != ExerciseManagement::ExerciseState::Paused ||
            request.newState() == ExerciseManagement::ExerciseState::Stopped)
        {
          auto retLinked = ifsLinked->switchToState(request.newState(), request.operatorId(), request.workstationId());
          if (retLinked.error())
            return retLinked;
        }
      }
    }
  }

  // state change to started requested? (case 'start' or 'resume')
  if ((request.newState() != ifs->exerciseState() ) &&
      (request.newState() == ExerciseManagement::ExerciseState::Started))
  {
    QString mesg;
    if (!checkEquipmentNumbersOnAllExercises(request.id(), mesg))
      return Core::FunctionReplyObject(request.id(),
                                       tr_lts("dds", "Can not start exercise - equipment numbers already in use: %1 ")).arg(mesg);
  }

  Database::ExmExercise data(copyBaseData(request));
  data.exerciseStateId  = request.newState();
  data.activePhaseId    = request.activePhaseId();
  data.operatorId       = request.operatorId();
  data.workstationId    = request.workstationId();

  return ifs->updateObject(data);
}

//void HandlerExercise::onExerciseChangeStateRequest(const rti::core::SampleIdentity &cookie,
//                                                   const ExerciseManagement::ExerciseChangeStateRequest &request)
//{
//  Core::FunctionReplyObject ret;

//  INFO_LOG(m_logger) << "onExerciseChangeStateRequest id = " << request.id();

//  ObjectExercise *ifs = m_exeObjMap.value(request.id());
//  if (ifs == nullptr)
//  {
//    ret = Core::FunctionReplyObject(request.id(), tr_lts("dds", "Exercise with id %1 not found")).arg(request.id());
//    m_ddsHandler->fts()->exerciseChangeStateReply(cookie, ret);
//    return;
//  }

//  DEBUG_LOG(m_logger) << "request.newState() = " << request.newState();

//  ret = ifs->switchToState(request.newState());
//  if (!ret.error() && ifs->linkedExerciseId() != 0)
//  {
//    if (request.newState() == ExerciseManagement::ExerciseState::Started ||
//        request.newState() == ExerciseManagement::ExerciseState::Stopped)
//    {
//      ObjectExercise *ifsLinked = m_exeObjMap.value(ifs->linkedExerciseId());
//      if (!ifsLinked)
//        WARNING_LOG(m_logger) << "Linked exercise with id " << ifs->linkedExerciseId() << " not found!";
//      else
//      {
//        if (ifsLinked->exerciseState() != ExerciseManagement::ExerciseState::Paused ||
//            request.newState() == ExerciseManagement::ExerciseState::Stopped)
//          ret = ifsLinked->switchToState(request.newState());
//      }
//    }
//  }

//  if (ret.error())
//    ERROR_LOG(m_logger) << ret();

//  m_ddsHandler->fts()->exerciseChangeStateReply(cookie, ret);
//}


//uint qHash(const HandlerExercise::ImageKey &key)
//{
//  return ::qHash(key.m_size.height()) ^ (::qHash(key.m_size.width()) >> 2) ^ ::qHash(key.m_lowBandwidth);
//}


void HandlerExercise::onGetExerciseImageRequest(const rti::core::SampleIdentity &cookie,
                                                const GetExerciseImageRequest &request)
{
  Core::FunctionReplyObject fro;
  GetExerciseImageReply reply;

  int32_t exerciseId = request.exerciseId();
  reply.id(exerciseId);

  DEBUG_LOG(m_logger) << "onGetExerciseImageRequest id = " << exerciseId;

  Database::ExmExerciseImage exmImg;
  if (!m_db->selectExmExerciseImage(exerciseId, exmImg))
    fro = Core::FunctionReplyObject(exerciseId, tr_lts("dds", "Exercise image with id %1 not found")).arg(exerciseId);

  if (fro.error())
  {
    reply.id(fro.id());
    reply.errorString(fro.str());
    reply.errorParams(fro.args());
  }
  else
  {
    reply.imageData(LtsUtils::convert<std::vector<uint8_t>>(exmImg.image));

    // TODO: reimpl optimization routines (e.g. use ImageMagick instead of GuiApplication, which won't work without an X server)
//    QPixmap excPx(LtsUtils::getPixmap(exmImg.image));

//    if (!excPx.isNull())
//    {
//      QSize newImgSize(request.maxWidth(), request.maxHeight());
//      QRect requestedRect(QPoint(0, 0), newImgSize);
//      QRect pictureRect(QPoint(0, 0), excPx.size());

//      if (pictureRect.contains(requestedRect)) // only shrink, don't grow (which would make the image unnecessarily bigger)
//      {
//        if (request.lowBandwidth()) // make the image even smaller on limited bandwidth (e.g. Tablet on WiFi)
//          newImgSize /= 2.5;

//        excPx = excPx.scaled(newImgSize, Qt::KeepAspectRatio);
//      }

//      reply.imageData(LtsUtils::fromPixmap(excPx));
//    }
//    else
//      ERROR_LOG(m_logger) << "image isNull for exercise " << exerciseId;
  }

/* test behaviour on bad network speeds
  QTimer::singleShot(5000, this, [this, cookie, reply]()
  {*/
  m_ddsHandler->fts()->getExerciseImageReply(cookie, reply); /*
  });*/
}


void HandlerExercise::onExerciseImageModifyRequest(const rti::core::SampleIdentity &cookie,
                                                   const ExerciseImageModifyRequest &request)
{
  qint32 exerciseId = request.id();

  DEBUG_LOG(m_logger) << "onExerciseImageModifyRequest id = " << exerciseId << ", image size = " << request.image().size();

  Database::ExmExerciseImage exImg;
  exImg.exerciseId = exerciseId;

  bool result = m_db->selectExmExerciseImage(exerciseId, exImg);
  exImg.image = LtsUtils::toQByteArray(request.image());

  if (result)
  {
    // exists => update
    if (!m_db->update(exImg))
    {
      m_ddsHandler->fts()->exerciseImageModifyReply(cookie, Core::FunctionReplyObject(exerciseId, tr_lts("dds", "Error updating Exercise image for exercise id %1")).arg(exerciseId));
      return;
    }
  }
  else
  {
    // doesn't exist yet => insert

    if (!m_db->insert(exImg))
    {
      m_ddsHandler->fts()->exerciseImageModifyReply(cookie, Core::FunctionReplyObject(exerciseId, tr_lts("dds", "Error inserting Exercise image for exercise id %1")).arg(exerciseId));
      return;
    }
  }

  m_ddsHandler->fts()->exerciseImageModifyReply(cookie, Core::FunctionReplyObject(exerciseId));
}

void HandlerExercise::onExerciseRemoveRequest(const rti::core::SampleIdentity &cookie,
                                              const ExerciseManagement::ExerciseRemoveRequest &request)
{
  Core::FunctionReplyObject ret;
  ObjectExercise *ifs = m_exeObjMap.value(request.id());
  if (ifs == nullptr)
  {
    ret = Core::FunctionReplyObject(request.id(), tr_lts("dds", "Exercise with id %1 not found")).arg(request.id());
    m_ddsHandler->fts()->exerciseRemoveReply(cookie, ret);
    return;
  }

  ExerciseManagement::Exercise ddsData;
  ddsData.id(request.id());

  if (m_mainHandler->dds()->topicLockMaster()->isLocked(ddsData, 0))
  {
    ret = Core::FunctionReplyObject(request.id(), tr_lts("dds", "Exercise '%1' is used by another user!")).arg(ifs->data().name);
    m_mainHandler->dds()->fts()->exerciseRemoveReply(cookie, ret);
    return;
  }

  ret = ifs->removeObject(request.force());

  if (ret.error())
  {
    ERROR_LOG(m_logger) << ret();
  }
  else
  {
    // delete ObjectExercise (including ExerciseStateMachine)
    delete ifs;
    m_exeObjMap.remove(request.id());
  }

  m_ddsHandler->fts()->exerciseRemoveReply(cookie, ret);

  return;
}


void HandlerExercise::onStartGroupReply(const Core::FunctionReplyObject &replyObject)
{
  if (replyObject.error())
    WARNING_LOG(m_logger) << "Error starting group: " << replyObject();
}


bool HandlerExercise::checkEquipmentNumbersOnAllExercises(int exerciseIdToBeStarted, QString &mesgOut)
{
  INFO_LOG(m_logger) << LOGFUNCTION <<" START, exerciseIdTobeStarted: " << exerciseIdToBeStarted;

  // only one exercise, about to start
  if (m_exeObjMap.size() <= 1)
    return true;

  // first
  // get all eqIds of exercise to be started
  QSet<int> eqNoForEx;
  {
    std::shared_ptr<DDSConnector::DdsConnector> ddsConnectorForEx;
    int domainId = m_ddsHandler->ddsConnector()->getDomainId();
    ddsConnectorForEx = std::make_shared<DDSConnector::DdsConnector>(domainId, IDL::PartitionType::Exercise, exerciseIdToBeStarted);
    ddsConnectorForEx->init();
    ddsConnectorForEx->initSubscriber();

    std::shared_ptr<ParticipantManagement::Interface::Dtc> ppmDtcForEx;
    ppmDtcForEx = ParticipantManagement::Interface::Dtc::create(ddsConnectorForEx);

    if (!ppmDtcForEx)
    {
      WARNING_LOG(m_logger) << LOGFUNCTION << " no ppmDtcForEx (" << exerciseIdToBeStarted << ")";
      return true;
    }
    ppmDtcForEx->enableParticipant();
    ppmDtcForEx->waitForHistoricalDataParticipant();              // <---------- waitForHistoricalDataParticipant may take a while :-(

    const auto cb = [&eqNoForEx](const ParticipantManagement::Participant &data) -> void
    {
      if (data.equipmentNumber().is_set())
        eqNoForEx.insert(data.equipmentNumber().get());
    };
    ppmDtcForEx->participants(cb);
  }

  // second:
  // get ParticipantManagement::EquipmentExerciseMapping
  // all eqIds of running/started exercises
  std::shared_ptr<ParticipantManagement::Interface::Dtc> ppmDtc = m_ddsHandler->ppmDtc();
  if (!ppmDtc)
  {
    WARNING_LOG(m_logger) << LOGFUNCTION << " no ppmDtc";
    return true;
  }

  QMap<int, QSet<int>> usedEqNumbers;

  const auto cb = [this, &usedEqNumbers, exerciseIdToBeStarted, eqNoForEx](const ParticipantManagement::EquipmentExerciseMapping &equipmentExerciseMapping) -> void
  {
    const int exerciseId = equipmentExerciseMapping.exerciseId();

    // in case of resume exercise:
    if (exerciseId == exerciseIdToBeStarted)
      return;

    // typically just exercises with state == Started should be published.
    // but to be sure:
    ObjectExercise *ifs = m_exeObjMap.value(exerciseId);
    if (!ifs)
    {
      ERROR_LOG(m_logger) << LOGFUNCTION << " Exercise not found, exId = " << exerciseId;
      return;
    }
    if ((ifs->exerciseState() == ExerciseState::Started) ||
        (ifs->exerciseState() == ExerciseState::Paused))
    {
      const std::vector<ParticipantManagement::Equipment2ParticipantId> &mapping = equipmentExerciseMapping.mapping();
      for (const auto &eq2p : qAsConst(mapping))
        if (eqNoForEx.contains(eq2p.equipmentNumber()))
        {
          DEBUG_LOG(m_logger) << LOGFUNCTION << " !!! eq = " << eq2p.equipmentNumber() << " is already used in exercise =" << exerciseId;
          usedEqNumbers[exerciseId].insert(eq2p.equipmentNumber());
        }
    }
  };
  ppmDtc->equipmentExerciseMappings(cb);

  if (!usedEqNumbers.isEmpty())
  {

    // convert to msg string:
    QMapIterator<int, QSet<int>> mapIt(usedEqNumbers);
    while (mapIt.hasNext())
    {
      mapIt.next();
      int exerciseId = mapIt.key();
      const QSet<int> &usedEqNumbersPerExercise = mapIt.value();

      if (!usedEqNumbersPerExercise.isEmpty())
      {
        mesgOut += QString(QStringLiteral("'%1' -> (")).arg(m_exeObjMap[exerciseId]->data().name);

        QSetIterator<int> setIt(usedEqNumbersPerExercise);
        while (setIt.hasNext())
        {
          int eqNo = setIt.next();
          mesgOut += QString::number(eqNo);
          if (setIt.hasNext())
            mesgOut += QStringLiteral(",");
        } // while
        mesgOut += QStringLiteral("); ");
      }
    } // while

    WARNING_LOG(m_logger) << LOGFUNCTION << " state change request not allowed: mesgOut:" << mesgOut;

    // limit length:
    if (mesgOut.size()>200)
    {
      mesgOut.resize(200);
      mesgOut += QStringLiteral("...");
    }

    return false;
  }
  return true;
}

QStringList HandlerExercise::doubleChannels(int exerciseAId, int exerciseBId) const
{
  auto cnrConfigs = m_ddsHandler->avmDtc()->cnrConfigs();
  QVector<int> exerciseAChannelIds;
  QVector<int> exerciseBChannelIds;

  exerciseAChannelIds.reserve(cnrConfigs.size());
  exerciseBChannelIds.reserve(cnrConfigs.size());

  for (auto it = cnrConfigs.constBegin(); it != cnrConfigs.constEnd(); ++it)
  {
    int cnrExerciseId = it.value().exerciseId().is_set() ? it.value().exerciseId().get() : 0;

    if (cnrExerciseId == exerciseAId)
    {
      exerciseAChannelIds.append(it.value().cnrChannelId());
      continue;
    }

    if (cnrExerciseId == exerciseBId)
    {
      exerciseBChannelIds.append(it.value().cnrChannelId());
      continue;
    }
  }

  QStringList doubleChannelNames;

  doubleChannelNames.reserve(exerciseAChannelIds.size());

  for (int exerciseAChannelId : qAsConst(exerciseAChannelIds))
  {
    if (exerciseBChannelIds.contains(exerciseAChannelId))
      doubleChannelNames.append(QString::fromStdString(m_ddsHandler->avmDtc()->cnrChannel(exerciseAChannelId).name()));
  }

  return doubleChannelNames;
}

} // Namespace ExerciseManagement