/*
 * Copyright (C) 2005-2022 Centre National d'Etudes Spatiales (CNES)
 *
 * This file is part of Orfeo Toolbox
 *
 *     https://www.orfeo-toolbox.org/
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


#ifndef mvdAbstractImageModel_h
#define mvdAbstractImageModel_h

//
// Configuration include.
//// Included at first position before any other ones.
#include "ConfigureMonteverdi.h"

#include "OTBMonteverdiCoreExport.h"

/*****************************************************************************/
/* INCLUDE SECTION                                                           */

//
// Qt includes (sorted by alphabetic order)
//// Must be included before system/custom includes.

//
// System includes (sorted by alphabetic order)

//
// ITK includes (sorted by alphabetic order)

//
// OTB includes (sorted by alphabetic order)
#include "otbImage.h" // Needed to get otb::internal::Get/SetSignedSpacing()
//
// Monteverdi includes (sorted by alphabetic order)
#include "mvdAbstractLayerModel.h"
#include "mvdImageProperties.h"
#include "mvdTypes.h"

/*****************************************************************************/
/* PRE-DECLARATION SECTION                                                   */

//
// External classes pre-declaration.
namespace
{
}

namespace mvd
{
//
// Internal classes pre-declaration.
class HistogramModel;
class ImageProperties;
class QuicklookModel;


/*****************************************************************************/
/* CLASS DEFINITION SECTION                                                  */

/** \class AbstractImageModel
 * \ingroup OTBMonteverdiCore
 *
 */
class OTBMonteverdiCore_EXPORT AbstractImageModel : public AbstractLayerModel
{

  /*-[ QOBJECT SECTION ]-----------------------------------------------------*/

  Q_OBJECT;

  /*-[ PUBLIC SECTION ]------------------------------------------------------*/

  //
  // Public types.
public:
  /**
   * \class BuildContext
   * \brief WIP.
   * \ingroup OTBMonteverdiCore
   */
  class BuildContext
  {
    //
    // Public methods.
  public:
    /** \brief Contrustor (testing consistency). */
    BuildContext() : m_Id(-1), m_Filename(), m_Quicklook(), m_Histogram(), m_Settings(NULL), m_Properties(NULL), m_IsBeingStored(false)
    {
    }

    /** \brief Constructor (importing image). */
    BuildContext(const QString& filename)
      : m_Id(-1), m_Filename(filename), m_Quicklook(), m_Histogram(), m_Settings(NULL), m_Properties(NULL), m_IsBeingStored(true)
    {
      assert(!filename.isEmpty());
    }

    /** \brief Constructor (loading image). */
    BuildContext(void* const settings, ImageProperties* const properties)
      : m_Id(-1), m_Filename(), m_Quicklook(), m_Histogram(), m_Settings(settings), m_Properties(properties), m_IsBeingStored(false)
    {
    }

    /**
     */
    inline bool IsBeingStored() const
    {
      return m_IsBeingStored;
    }

    //
    // Public attributes
  public:
    int                    m_Id;
    QString                m_Filename;
    QString                m_Quicklook;
    QString                m_Histogram;
    void* const            m_Settings;
    ImageProperties* const m_Properties;

  private:
    bool m_IsBeingStored;
  };

  //
  // Public methods.
public:
  /** Destructor */
  ~AbstractImageModel() override;

  /** */
  inline int GetId() const;

  /**
   * \return This image properties.
   */
  inline const ImageProperties* GetProperties() const;

  /**
   * \return This image properties.
   */
  inline ImageProperties* GetProperties();

  /**
   * \brief Copy external properties data to this image properties.
   *
   * \param properties External properties.
   */
  inline void SetProperties(const ImageProperties& properties);

  /** */
  const QuicklookModel* GetQuicklookModel() const;

  /** */
  QuicklookModel* GetQuicklookModel();

  /** */
  inline const HistogramModel* GetHistogramModel() const;

  /** */
  inline HistogramModel* GetHistogramModel();

  /**
   * Get a smart-pointer to the current LOD image-base.
   */
  virtual ImageBaseType::ConstPointer ToImageBase() const = 0;

  /**
   * Get a smart-pointer to the current LOD image-base.
   */
  virtual ImageBaseType::Pointer ToImageBase() = 0;


  /**
   * Get a reference to the ImageMetadata.
   */
  virtual const otb::ImageMetadata & GetImageMetadata() const = 0;


  /**
   * \return The largest possible region of the current LOD level.
   */
  inline const ImageRegionType& GetLodLargestRegion() const;

  /**
   * \return The largest possible region of the native image, which
   * is, by default, LOD level zero.
   */
  inline const ImageRegionType& GetNativeLargestRegion() const;

  /**
   * \return The spacing of the native image, which
   * is, by default, LOD level zero.
   */
  inline const SpacingType& GetNativeSpacing() const;

  /**
   * \return The estimated spacing of the native image at full resolution
   *
   */
  inline const SpacingType& GetEstimatedGroundSpacing() const;

  /** */
  inline CountType GetNbComponents() const;

  /**
   */
  QStringList GetBandNames(bool enhanced = false) const;

  /**
   * Get the number of available LOD.
   */
  virtual CountType GetNbLod() const = 0;

  /**
   * Set the current LOD index (which may causes disk IOs,
   * decompressing and buffering etc.)
   */
  inline void SetCurrentLod(CountType lod);

  /**
   * Get the current LOD index.
   */
  inline CountType GetCurrentLod() const;

  /**
   */
  inline const SpacingType GetSpacing() const;

  /**
   */
  inline const PointType& GetOrigin() const;

  /**
   */
  inline PointType GetCenter() const;

  //
  // Public SLOTS.
public Q_SLOTS:

  /**
   * \brief Refresh histogram-model based on no-data properties.
   */
  inline void RefreshHistogram();

  /*-[ SIGNALS SECTION ]-----------------------------------------------------*/

  //
  // Signals.
Q_SIGNALS:
  /** */
  void SpacingChanged(const SpacingType&);

  /*-[ PROTECTED SECTION ]---------------------------------------------------*/

  //
  // Protected methods.
protected:
  /** Constructor */
  AbstractImageModel(QObject* p = NULL);

  /**
   * \brief Set image properties pointer.
   *
   * \param properties The new properties instance.
   */
  inline void SetProperties(ImageProperties* properties);

  /**
   * \brief Refresh histogram-model based on no-data settings.
   *
   * \param context Pointer to a histogram build-context.
   */
  void RefreshHistogram(void* const context);

  //
  // AbstractModel methods.

  void virtual_BuildModel(void* context) override;

  //
  // Protected attributes.
protected:
  /**
   * The largest possible region of the native image, which is, by
   * default, LOD level zero.
   */
  ImageRegionType m_NativeLargestRegion;

  /**
   * The spacing of the native image, which is, by
   * default, LOD level zero.
   */
  SpacingType m_NativeSpacing;

  /**
   * The estimated spacing of the native image at full resolution  which is, by
   * default, display in image info.
   */
  SpacingType m_EstimatedGroundSpacing;

  /*-[ PRIVATE SECTION ]-----------------------------------------------------*/

  //
  // Private methods.
private:
  /**
   */
  virtual void virtual_SetCurrentLod(CountType lod) = 0;

  /**
   * \brief Private virtual implementation of RefreshHistogram.
   *
   * Implement this method in subclass to construct a valid
   * HistogramModel::BuildContext and call RefreshHistogram(void*
   * const).
   */
  virtual void virtual_RefreshHistogram(){};

  //
  // Private attributes.
private:
  /**
   */
  int m_Id;

  /**
   */
  CountType m_CurrentLod;

  /**
   */
  ImageProperties* m_Properties;

  /*-[ PRIVATE SLOTS SECTION ]-----------------------------------------------*/

  //
  // Slots.
private Q_SLOTS:
};

} // end namespace 'mvd'

/*****************************************************************************/
/* INLINE SECTION                                                            */

//
// ITK includes (sorted by alphabetic order)

//
// OTB includes (sorted by alphabetic order)

//
// Monteverdi includes (sorted by alphabetic order)
#include "mvdHistogramModel.h"

namespace mvd
{

/*****************************************************************************/
int AbstractImageModel::GetId() const
{
  return m_Id;
}

/*****************************************************************************/
inline const ImageProperties* AbstractImageModel::GetProperties() const
{
  return m_Properties;
}

/*****************************************************************************/
inline ImageProperties* AbstractImageModel::GetProperties()
{
  return m_Properties;
}

/*****************************************************************************/
inline void AbstractImageModel::SetProperties(const ImageProperties& properties)
{
  assert(m_Properties != NULL);

  *m_Properties = properties;
}

/*****************************************************************************/
const HistogramModel* AbstractImageModel::GetHistogramModel() const
{
  return findChild<const HistogramModel*>();
}

/*****************************************************************************/
HistogramModel* AbstractImageModel::GetHistogramModel()
{
  return findChild<HistogramModel*>();
}

/*****************************************************************************/
CountType AbstractImageModel::GetCurrentLod() const
{
  return m_CurrentLod;
}

/*****************************************************************************/
void AbstractImageModel::SetCurrentLod(CountType lod)
{
  assert(lod < GetNbLod());
  virtual_SetCurrentLod(lod);

  m_CurrentLod = lod;

  // if everything ok emit the new spacing of the current lod
  Q_EMIT SpacingChanged(otb::internal::GetSignedSpacing(static_cast<ImageBaseType*>(ToImageBase())));
}

/*****************************************************************************/
inline const ImageRegionType& AbstractImageModel::GetLodLargestRegion() const
{
  return ToImageBase()->GetLargestPossibleRegion();
}

/*****************************************************************************/
inline const ImageRegionType& AbstractImageModel::GetNativeLargestRegion() const
{
  return m_NativeLargestRegion;
}

/*****************************************************************************/
inline const SpacingType& AbstractImageModel::GetNativeSpacing() const
{
  return m_NativeSpacing;
}


/*****************************************************************************/
inline const SpacingType& AbstractImageModel::GetEstimatedGroundSpacing() const
{
  return m_EstimatedGroundSpacing;
}

/*****************************************************************************/
inline CountType AbstractImageModel::GetNbComponents() const
{
  return ToImageBase()->GetNumberOfComponentsPerPixel();
}

/*****************************************************************************/
inline const PointType& AbstractImageModel::GetOrigin() const
{
  assert(!ToImageBase().IsNull());

  return ToImageBase()->GetOrigin();
}

/*****************************************************************************/
inline const SpacingType AbstractImageModel::GetSpacing() const
{
  assert(!ToImageBase().IsNull());

  return otb::internal::GetSignedSpacing(static_cast<ImageBaseType const*>(ToImageBase()));
}

/*****************************************************************************/
inline PointType AbstractImageModel::GetCenter() const
{
  PointType   center(GetOrigin());
  SpacingType spacing(GetSpacing());
  SizeType    size(GetNativeLargestRegion().GetSize());

  center[0] += 0.5 * spacing[0] * static_cast<double>(size[0]);
  center[1] += 0.5 * spacing[1] * static_cast<double>(size[1]);

  return center;
}

/*****************************************************************************/
inline void AbstractImageModel::RefreshHistogram()
{
  virtual_RefreshHistogram();
}

/*****************************************************************************/
inline void AbstractImageModel::SetProperties(ImageProperties* properties)
{
  if (m_Properties == properties)
    return;

  delete m_Properties;

  m_Properties = properties;
}

} // end namespace 'mvd'

#endif // mvdAbstractImageModel_h