/**
  * Handler for Video Overlays
  * $Id$
  * $HeadURL$
  * $Author$
  * Created by hjl, SLSE, 2016-07-07
  */

#include "handler_overlays.h"
#include "handler_participant_data.h"
#include "settings.h"

#include <QByteArray>

using namespace VideoOverlayManagement;

HandlerOverlays::HandlerOverlays(AvsInterface *avsIf,
                                 const std::shared_ptr<HandlerParticipantData> &handlerParticipantData,
                                 const std::shared_ptr<HandlerInfrastructureData> &handlerInfrastructureData,
                                 int exerciseId,
                                 QObject *parent)
  : QObject(parent)
  , m_avsIf(avsIf)
  , m_handlerParticipantData(handlerParticipantData)
  , m_handlerInfrastructureData(handlerInfrastructureData)
  , m_exerciseId(exerciseId)
  , m_logger(getLogger("HandlerOverlays"))
{
} // end of ctor()
//-----------------------------------------------------------------------------

HandlerOverlays::~HandlerOverlays()
{
} // end of dtor()
//-----------------------------------------------------------------------------

bool HandlerOverlays::init()
{
  INFO_LOG(m_logger) << "Start VideoOverlay Handler.";

  // internal Signal/Slot connection (must be done before calling initParticipantsInRoomMap() !)
  connect(this, &HandlerOverlays::participantsInRoomMapChanged,
          this, &HandlerOverlays::onParticipantsInRoomMapChanged);

  // Get assigned participants to roomId data from Player Management ...
  initParticipantsInRoomMap();
  // Subscribe for external changes
  connect(m_handlerParticipantData.get(), &HandlerParticipantData::participantPositionChanged,
          this, &HandlerOverlays::onParticipantPositionChanged);

  INFO_LOG(m_logger) << "VOM Handler initialized. ";

  return true;
} // end of init()
//-----------------------------------------------------------------------------

void HandlerOverlays::onParticipantPositionChanged(int oldRoomId, int newRoomId, int participantId)
{
  DEBUG_LOG(m_logger) << "onParticipantPositionChanged() "
                      << " oldRoomId: " << oldRoomId
                      << " newRoomId: " << newRoomId
                      << " participantId: " << participantId
                      ;

  if (oldRoomId > 0) // is valid
    removePartIdFromParticipantsInRoomMap(oldRoomId, participantId);

  if (newRoomId > 0)
    addPartIdToParticipantsInRoomMap(newRoomId, participantId);
} // end of onParticipantPositionChanged()
//-----------------------------------------------------------------------------

void HandlerOverlays::onParticipantsInRoomMapChanged(int roomId, const QSet<int> &participants)
{
  DEBUG_LOG(m_logger) << "onParticipantsInRoomMapChanged() "
                      << " roomId: " << roomId
                      << " partId: " << getAllEquipmentNumbers(participants, false)
                      << " eqNo: " << getAllEquipmentNumbers(participants, true)
                      << " participants.size(): " << participants.size()
                      ;

  if (!m_handlerInfrastructureData->isCameraAvailable(roomId))
  {
    WARNING_LOG(m_logger) << "onParticipantsInRoomMapChanged()  Non camera available in roomId: " << roomId << " No data will be send to AVS.";
    return;
  }

  // SetStreamOverlayText Command String zusammenstellen
  QString cmd;
  QString contextName = getContextName();
  QString streamName = m_handlerInfrastructureData->getStreamNameFromRoomId(roomId);
  QString overlayTemplateName = getOverlayTemplateName();

  if (streamName.isEmpty())
  {
    ERROR_LOG(m_logger) << "onParticipantsInRoomMapChanged()  No streamName found for roomId: " << roomId << " No data will be send to AVS.";
    return;
  }

  cmd.append(QLatin1String("SetStreamOverlayText "));
  cmd.append(contextName);
  cmd.append(QLatin1String(" "));
  cmd.append(streamName);
  cmd.append(QLatin1String(" "));
  cmd.append(overlayTemplateName);
  cmd.append(QLatin1String(" "));
  cmd.append(QLatin1String("0 "));
  cmd.append(QLatin1String("\""));

  cmd.append(QLatin1String("Participants(EqNo) in roomId "));
  cmd.append((QString::number(roomId)));
  cmd.append(QLatin1String(":  "));
  cmd.append(getAllEquipmentNumbers(participants, true));
  cmd.append(QLatin1String("\""));

  QByteArray qba = cmd.toLatin1();
  qba += "\r\n";

  INFO_LOG(m_logger) << "onParticipantsInRoomMapChanged() sendCommand: " << qba ;
  m_avsIf->sendCommand(qba);

  // room entry der keine participants enthaelt loeschen
  if (participants.isEmpty())
    m_participantsInRoomMap.remove(roomId);
} // end of onParticipantsInRoomMapChanged()
//-----------------------------------------------------------------------------

void HandlerOverlays::initParticipantsInRoomMap()
{
  // QMap<participantId, roomId>
  const QMap<int, int> qm = m_handlerParticipantData->getAllAssignedParticipants();

  for (auto i = qm.begin(); i != qm.end(); ++i)
    onParticipantPositionChanged(0, i.value(), i.key());
} // end of initParticipantsInRoomMap()
//-----------------------------------------------------------------------------

void HandlerOverlays::addPartIdToParticipantsInRoomMap(int roomId, int participantId)
{
  DEBUG_LOG(m_logger) << "addPartIdToParticipantsInRoomMap() "
                      << " roomId: " << roomId
                      << " participantId: " << participantId
                      ;

  QSet<int> participants;

  if (m_participantsInRoomMap.contains(roomId))
  {
    QMap<int, QSet<int>>::const_iterator i = m_participantsInRoomMap.constFind(roomId);
    participants = i.value();
  }

  participants.insert(participantId);
  m_participantsInRoomMap.insert(roomId, participants);

  ///
  DEBUG_LOG(m_logger) << "emit participantsInRoomMapChanged()"
                      << " roomId: " << roomId
                      << " partId: " << getAllEquipmentNumbers(participants, false)
                      << " eqNo: " << getAllEquipmentNumbers(participants, true)
                      << " participants.size(): " << participants.size()
                      ;

  emit participantsInRoomMapChanged(roomId, participants);
} // end of addPartIdToParticipantsInRoomMap()
//-----------------------------------------------------------------------------

void HandlerOverlays::removePartIdFromParticipantsInRoomMap(int roomId, int participantId)
{
  DEBUG_LOG(m_logger) << "removePartIdFromParticipantsInRoomMap() "
                      << " roomId: " << roomId
                      << " participantId: " << participantId
                      ;

  if (m_participantsInRoomMap.contains(roomId))
  {
    QMap<int, QSet<int>>::const_iterator i = m_participantsInRoomMap.constFind(roomId);
    QSet<int> participants = i.value();

    // remove participant from the set
    participants.remove(participantId);
    m_participantsInRoomMap.insert(roomId, participants);

    DEBUG_LOG(m_logger) << "emit participantsInRoomMapChanged()"
                        << " roomId: " << roomId
                        << " partId: " << getAllEquipmentNumbers(participants, false)
                        << " eqNo: " << getAllEquipmentNumbers(participants, true)
                        << " participants.size(): " << participants.size()
                        ;

    emit participantsInRoomMapChanged(roomId, participants);
  }
} // end of removePartIdFromParticipantsInRoomMap()
//-----------------------------------------------------------------------------

QString HandlerOverlays::getContextName() const
{
  QString qs(Settings::getContextName());
  qs.append(QString::number(m_exerciseId));
  return qs;
} // end of getContextName()
//-----------------------------------------------------------------------------

QString HandlerOverlays::getOverlayTemplateName() const
{
  return Settings::getOverlayTemplateName();
} // end of getOverlayTemplateName()
//-----------------------------------------------------------------------------

QSet<int> HandlerOverlays::convertParticipantIdsToEquipmentNo(const QSet<int> &participants) const
{
  QSet<int> equipmentNumbers;

  for (int currentParticipantId : participants)
  {
    int equipmentNumber = m_handlerParticipantData->getEquipmentNumber(currentParticipantId);
    equipmentNumbers.insert(equipmentNumber);
  }
  return equipmentNumbers;
} // end of convertParticipantIdsToEquipmentNo()
//-----------------------------------------------------------------------------

QString HandlerOverlays::getAllEquipmentNumbers(QSet<int> data, bool isParticipantIds) const
{
  QString qs;

  if (isParticipantIds)
    data = convertParticipantIdsToEquipmentNo(data);

  for (int currentDataId : qAsConst(data))
  {
    qs.append(QString::number(currentDataId));
    qs.append(QLatin1String(", "));
  }
  // remove last ", "
  if (!qs.isEmpty())
    qs.chop(2);
  return qs;
} // end of getAllEquipmentNumbers()
//-----------------------------------------------------------------------------