/**
 * @RDE_HEADER@
 * $Id$
 * $HeadURL$
 * $Author$
 * Created by Norbert Thoden, SLTE, 2023-11-08
 */

#pragma once

#include "logger.h"
#include <LtsElevation/ltselevation_export.h>
#include <LtsUtilsCore/qpoint3d.h>

//#include <LtsSession/lts_session_data_dds.h>

#include <QObject>
#include <QPointer>
#include <QStringList>
#include <QCoreApplication> // qAddPostRoutine

#include <memory>
#include <iosfwd>

//  !!! Do NOT include files of __SituationMap/Elevation__ in this header file!!

namespace LtsSession
{
class LtsSessionDataDds;
} // namespace LtsSession

namespace ExerciseManagement
{
namespace Interface
{
class Dtc;
}
}

namespace AssetManagement
{
namespace Interface
{
class Dtc;
}
}


namespace LtsElevation
{

enum class LineOfSight { LOS_UNDEFINED,
                         LOS_ERROR,
                         LOS_VISIBLE,
                         LOS_INVISIBLE };

class LtsElevationManager;
using LTS_ELEVATION_MANAGER_TYPE = QPointer<LtsElevationManager>;


/**
 * @brief The LtsElevationManager class provides access to the terrain / elevation
 * It wraps the SituationMap::ElevationMapManger.
 */
class LTSELEVATION_EXPORT LtsElevationManager : public QObject
{
public:

  // main access:

  /**
   * @brief createInstance create method for singleton.
   *
   * @param exerciseId to be choosen.
   * @param exmDtc access to ExerciseManagement
   * @param asmDtc access to AssetDataManagement
   *
   * <b>Example:
   *
   * \code
    // Server: Prepare at MainHandler
    // (dtcs necessary for very first call)
    LtsElevation::LtsElevationManager *ltsElevationManager =
      LtsElevation::LtsElevationManager::createInstance(exerciseId,
                                                        dds()->exmDtc(),
                                                        dds()->asmDtc());

    // Server: Use later on - e.g. Ces plugin:
    // (dtcs not necessary anymore)
    LtsElevation::LtsElevationManager *ltsElevationManager =
      LtsElevation::LtsElevationManager::createInstance(exerciseId);

   * \endcode
   *
   */
  static LTS_ELEVATION_MANAGER_TYPE createInstance(int exerciseId,
                                                   const std::shared_ptr<ExerciseManagement::Interface::Dtc> &exmDtc = {},
                                                   const std::shared_ptr<AssetManagement::Interface::Dtc> &asmDtc = {});

  static LTS_ELEVATION_MANAGER_TYPE getInstance(int exerciseId);


  static LTS_ELEVATION_MANAGER_TYPE createInstanceForTrainingAreaId(int trainingAreaId,
                                                                    const std::shared_ptr<AssetManagement::Interface::Dtc> &asmDtc = nullptr);

//  // For WS / OperatorApplication maybe like:
//  static LtsElevationManager *createInstance(int exerciseId, LtsSession::LtsSessionDataDds *session);

  static void cleanupAll();
  virtual ~LtsElevationManager();


  bool waitForInitialization();
  bool isValid() const;

  double elevation(double lon_rad, double lat_rad, double defaultValue = std::numeric_limits<double>::min(), bool *bIsCovered = nullptr) const;

  LineOfSight lineOfSightCalculation(const LtsUtils::QPoint3D &startPointGeo_absZ,
                                     const LtsUtils::QPoint3D &endPointGeo_absZ);

  LineOfSight lineOfSightCalculation(const QPointF &startPointGeo, double startHat,
                                     const QPointF &endPointGeo, double endHat);

protected:
  explicit LtsElevationManager();

  /**
   * @brief initDDS
   * @param exmDtc
   * @param asmDtc
   */
  void initDDS(const std::shared_ptr<ExerciseManagement::Interface::Dtc> &exmDtc,
               const std::shared_ptr<AssetManagement::Interface::Dtc> &asmDtc);
  bool init(const QStringList &filePaths_rough_to_fine);
  static int exerciseIdToTrainingAreaId(int exerciseId, const std::shared_ptr<ExerciseManagement::Interface::Dtc> &exmDtc);

//  static bool setupDtcs();
  QStringList getFilenamesForExercise(int exerciseId);
  QStringList getFilenamesForTrainingArea(int trainingAreaId);

  // !!! For UnitTest only !!!
  // !!! For UnitTest only !!!
  // !!! For UnitTest only !!!
  static LTS_ELEVATION_MANAGER_TYPE createInstanceUnitTest(int id, const QStringList &filePaths_rough_to_fine);

private:
  //  bool initDefaultValues();

  class Private;

  Private  *d;
  LOGGER_T  m_logger;      ///< Interface of the Logging-Facility
};

LTSELEVATION_EXPORT const QString toString(const LtsElevation::LineOfSight &value);

LTSELEVATION_EXPORT std::ostream &operator<< (std::ostream &stream,
                                               const LtsElevation::LineOfSight value);



} // namespace LtsElevation