/**
 * Stone of Orthanc
 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
 * Department, University Hospital of Liege, Belgium
 * Copyright (C) 2017-2019 Osimis S.A., Belgium
 *
 * This program is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Affero General Public License
 * as published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 **/


#include "DicomVolumeImageMPRSlicer.h"

#include <Core/OrthancException.h>

namespace OrthancStone
{
  void DicomVolumeImageMPRSlicer::Slice::CheckValid() const
  {
    if (!valid_)
    {
      throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
    }
  }


  DicomVolumeImageMPRSlicer::Slice::Slice(const DicomVolumeImage& volume,
                                          const CoordinateSystem3D& cuttingPlane) :
    volume_(volume),
    revision_(volume_.GetRevision())
  {
    valid_ = (volume_.HasDicomParameters() &&
              volume_.GetGeometry().DetectSlice(projection_, sliceIndex_, cuttingPlane));
  }


  VolumeProjection DicomVolumeImageMPRSlicer::Slice::GetProjection() const
  {
    CheckValid();
    return projection_;
  }


  unsigned int DicomVolumeImageMPRSlicer::Slice::GetSliceIndex() const
  {
    CheckValid();
    return sliceIndex_;
  }
  

  ISceneLayer* DicomVolumeImageMPRSlicer::Slice::CreateSceneLayer(const ILayerStyleConfigurator* configurator,
                                                                  const CoordinateSystem3D& cuttingPlane)
  {
    CheckValid();

    if (configurator == NULL)
    {
      throw Orthanc::OrthancException(Orthanc::ErrorCode_NullPointer,
                                      "A style configurator is mandatory for textures");
    }

    std::auto_ptr<TextureBaseSceneLayer> texture;
        
    {
      const DicomInstanceParameters& parameters = volume_.GetDicomParameters();
      ImageBuffer3D::SliceReader reader(volume_.GetPixelData(), projection_, sliceIndex_);
      texture.reset(dynamic_cast<TextureBaseSceneLayer*>
                    (configurator->CreateTextureFromDicom(reader.GetAccessor(), parameters)));
    }

    const CoordinateSystem3D& system = volume_.GetGeometry().GetProjectionGeometry(projection_);
      
    double x0, y0, x1, y1;
    cuttingPlane.ProjectPoint(x0, y0, system.GetOrigin());
    cuttingPlane.ProjectPoint(x1, y1, system.GetOrigin() + system.GetAxisX());
    texture->SetOrigin(x0, y0);

    double dx = x1 - x0;
    double dy = y1 - y0;
    if (!LinearAlgebra::IsCloseToZero(dx) ||
        !LinearAlgebra::IsCloseToZero(dy))
    {
      texture->SetAngle(atan2(dy, dx));
    }
        
    Vector tmp = volume_.GetGeometry().GetVoxelDimensions(projection_);
    texture->SetPixelSpacing(tmp[0], tmp[1]);

    return texture.release();
  }


  IVolumeSlicer::IExtractedSlice* 
  DicomVolumeImageMPRSlicer::ExtractSlice(const CoordinateSystem3D& cuttingPlane)
  {
    if (volume_->HasGeometry())
    {
      return new Slice(*volume_, cuttingPlane);
    }
    else
    {
      return new IVolumeSlicer::InvalidSlice;
    }
  }
}