/*=========================================================================
 *
 *  Copyright NumFOCUS
 *
 *  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
 *
 *         https://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  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 itkTriangleMeshToBinaryImageFilter_h
#define itkTriangleMeshToBinaryImageFilter_h

#include "itkImageSource.h"

#include "itkPolygonCell.h"
#include "itkMapContainer.h"
#include "itkVectorContainer.h"
#include "itkAutomaticTopologyMeshSource.h"
#include "itkPointSet.h"

#include <vector>

namespace itk
{
class Point1D
{
public:
  double m_X;
  int    m_Sign;

  Point1D() = default;
  Point1D(const double p, const int s)
  {
    m_X = p;
    m_Sign = s;
  }

  Point1D(const Point1D & point)
  {
    m_X = point.m_X;
    m_Sign = point.m_Sign;
  }

  double
  getX() const
  {
    return m_X;
  }

  int
  getSign() const
  {
    return m_Sign;
  }
};

/** \class TriangleMeshToBinaryImageFilter
 *
 * \brief 3D Rasterization algorithm Courtesy of Dr David Gobbi of Atamai Inc.

 * \author Leila Baghdadi, MICe, Hospital for Sick Children, Toronto, Canada,
 * \ingroup ITKMesh
 */
template <typename TInputMesh, typename TOutputImage>
class ITK_TEMPLATE_EXPORT TriangleMeshToBinaryImageFilter : public ImageSource<TOutputImage>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(TriangleMeshToBinaryImageFilter);

  /** Standard class type aliases. */
  using Self = TriangleMeshToBinaryImageFilter;
  using Superclass = ImageSource<TOutputImage>;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;

  using IndexType = typename TOutputImage::IndexType;
  using SizeType = typename TOutputImage::SizeType;
  using OutputImageType = TOutputImage;
  using OutputImagePointer = typename OutputImageType::Pointer;
  using ValueType = typename OutputImageType::ValueType;
  using SpacingType = typename OutputImageType::SpacingType;
  using DirectionType = typename OutputImageType::DirectionType;

  /** Method for creation through the object factory. */
  itkNewMacro(Self);

  /** \see LightObject::GetNameOfClass() */
  itkOverrideGetNameOfClassMacro(TriangleMeshToBinaryImageFilter);

  /** Superclass type alias. */
  using typename Superclass::OutputImageRegionType;

  /** Some convenient type alias. */
  using InputMeshType = TInputMesh;
  using InputMeshPointer = typename InputMeshType::Pointer;
  using InputPointType = typename InputMeshType::PointType;
  using InputPixelType = typename InputMeshType::PixelType;
  using InputCellTraitsType = typename InputMeshType::MeshTraits::CellTraits;
  using CellType = typename InputMeshType::CellType;
  using CellsContainerPointer = typename InputMeshType::CellsContainerPointer;
  using CellsContainerIterator = typename InputMeshType::CellsContainerIterator;

  using InputPointsContainer = typename InputMeshType::PointsContainer;
  using InputPointsContainerPointer = typename InputPointsContainer::Pointer;
  using InputPointsContainerIterator = typename InputPointsContainer::Iterator;

  using PointSetType = itk::PointSet<double, 3>;
  using PointsContainer = typename PointSetType::PointsContainer;

  using PointType = itk::Point<double, 3>;
  using Point2DType = itk::Point<double, 2>;

  using DoubleArrayType = itk::Array<double>;

  using Point1DVector = std::vector<Point1D>;
  using Point1DArray = std::vector<std::vector<Point1D>>;

  using Point2DVector = std::vector<Point2DType>;
  using Point2DArray = std::vector<std::vector<Point2DType>>;

  using PointVector = std::vector<PointType>;
  using PointArray = std::vector<std::vector<PointType>>;

  /** Spacing (size of a pixel) of the output image. The
   * spacing is the geometric distance between image samples.
   * It is stored internally as double, but may be set from
   * float. \sa GetSpacing() */
  itkSetMacro(Spacing, SpacingType);
  virtual void
  SetSpacing(const double spacing[3]);

  virtual void
  SetSpacing(const float spacing[3]);

  itkGetConstReferenceMacro(Spacing, SpacingType);

  /** The Direction is a matrix of direction cosines
   *  that specify the direction between samples.
   * */
  itkSetMacro(Direction, DirectionType);
  itkGetConstMacro(Direction, DirectionType);

  /** Set/Get the value for pixels inside the spatial object.
   * By default, this filter will return an image
   * If this "inside" value is changed to a non-null value,
   * the output produced by this filter will be a mask with inside/outside values
   * specified by the user. */
  itkSetMacro(InsideValue, ValueType);
  itkGetConstMacro(InsideValue, ValueType);

  /** Set/Get the value for pixels outside the spatial object.
   * By default, this filter will return an image
   * If this "outside" value is changed to a non-null value,
   * the output produced by this filter will be a mask with inside/outside values
   * specified by the user. */
  itkSetMacro(OutsideValue, ValueType);
  itkGetConstMacro(OutsideValue, ValueType);

  /** The origin of the output image. The origin is the geometric
   * coordinates of the index (0,0,...,0).  It is stored internally
   * as double but may be set from float.
   * \sa GetOrigin() */
  itkSetMacro(Origin, PointType);
  virtual void
  SetOrigin(const double origin[3]);

  virtual void
  SetOrigin(const float origin[3]);

  itkGetConstReferenceMacro(Origin, PointType);

  /** Set/Get Index */
  itkSetMacro(Index, IndexType);
  itkGetConstMacro(Index, IndexType);

  /** Set/Get Size */
  itkSetMacro(Size, SizeType);
  itkGetConstMacro(Size, SizeType);

  /** Set the input mesh. */
  using Superclass::SetInput;
  void
  SetInput(InputMeshType * input);

  void
  SetInfoImage(OutputImageType * InfoImage)
  {
    if (InfoImage != m_InfoImage)
    {
      this->Modified();
      m_InfoImage = InfoImage;
    }
  }

  /** Get the input mesh. */
  InputMeshType *
  GetInput();

  InputMeshType *
  GetInput(unsigned int idx);

  /* Set the tolerance for doing spatial searches of the polydata. */
  itkSetMacro(Tolerance, double);
  itkGetConstMacro(Tolerance, double);

protected:
  TriangleMeshToBinaryImageFilter();
  ~TriangleMeshToBinaryImageFilter() override = default;

  void
  GenerateOutputInformation() override
  {} // do nothing
  void
  GenerateData() override;

  virtual void
  RasterizeTriangles();

  /** Convert a single polygon/triangle to raster format. */
  static int
  PolygonToImageRaster(PointVector coords, Point1DArray & zymatrix, int extent[6]);

  OutputImageType * m_InfoImage{};

  IndexType m_Index{};

  SizeType m_Size{};

  SpacingType m_Spacing{};

  PointType m_Origin{}; // start value

  double m_Tolerance{};

  ValueType m_InsideValue{};
  ValueType m_OutsideValue{};

  DirectionType m_Direction{};

  void
  PrintSelf(std::ostream & os, Indent indent) const override;

private:
  static bool
  ComparePoints2D(Point2DType a, Point2DType b);

  static bool
  ComparePoints1D(Point1D a, Point1D b);
};
} // end namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
#  include "itkTriangleMeshToBinaryImageFilter.hxx"
#endif

#endif
