/* SPDX-FileCopyrightText: 2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */

#pragma once

/** \file
 * \ingroup freestyle
 * \brief Functions taking 0D input
 */

#include <set>
#include <vector>

#include "Interface0D.h"

#include "../geometry/Geom.h"

#include "../python/Director.h"

#include "../scene_graph/FrsMaterial.h"

#include "../system/Exception.h"
#include "../system/Precision.h"

#ifdef WITH_CXX_GUARDEDALLOC
#  include "MEM_guardedalloc.h"
#endif

namespace Freestyle {

class FEdge;
class ViewEdge;
class SShape;

using namespace Geometry;

//
// UnaryFunction0D (base class for functions in 0D)
//
///////////////////////////////////////////////////////////

/** Base class for Unary Functions (functors) working on Interface0DIterator.
 *  A unary function will be used by calling its operator() on an Interface0DIterator.
 * \attention In the scripting language, there exists several prototypes depending on the returned
 * value type. For example, you would inherit from a UnaryFunction0DDouble if you wish to define a
 * function that returns a double. The different existing prototypes are:
 *    - UnaryFunction0DDouble
 *    - UnaryFunction0DEdgeNature
 *    - UnaryFunction0DFloat
 *    - UnaryFunction0DId
 *    - UnaryFunction0DMaterial
 *    - UnaryFunction0DUnsigned
 *    - UnaryFunction0DVec2f
 *    - UnaryFunction0DVec3f
 *    - UnaryFunction0DVectorViewShape
 *    - UnaryFunction0DViewShape
 *    - UnaryFunction0DVoid
 */
template<class T> class UnaryFunction0D {
 public:
  T result;
  void *py_uf0D;

  /** The type of the value returned by the functor. */
  typedef T ReturnedValueType;

  /** Default constructor. */
  UnaryFunction0D()
  {
    py_uf0D = nullptr;
  }

  /** Destructor. */
  virtual ~UnaryFunction0D() {}

  /** Returns the string "UnaryFunction0D" */
  virtual string getName() const
  {
    return "UnaryFunction0D";
  }

  /** The operator ().
   *  \param iter:
   *    An Interface0DIterator pointing onto the point at which we wish to evaluate the function.
   *  \return the result of the function of type T.
   */
  /* FIXME move the implementation to Functions0D.cpp */
  virtual int operator()(Interface0DIterator &iter)
  {
    return Director_BPy_UnaryFunction0D___call__(this, py_uf0D, iter);
  }

#ifdef WITH_CXX_GUARDEDALLOC
  MEM_CXX_CLASS_ALLOC_FUNCS("Freestyle:UnaryFunction0D")
#endif
};

#ifdef SWIG
%feature("director")  UnaryFunction0D<void>;
%feature("director")  UnaryFunction0D<uint>;
%feature("director")  UnaryFunction0D<float>;
%feature("director")  UnaryFunction0D<double>;
%feature("director")  UnaryFunction0D<Vec2f>;
%feature("director")  UnaryFunction0D<Vec3f>;
%feature("director")  UnaryFunction0D<Id>;

%template(UnaryFunction0DVoid)             UnaryFunction0D<void>;
%template(UnaryFunction0DUnsigned)         UnaryFunction0D<uint>;
%template(UnaryFunction0DFloat)            UnaryFunction0D<float>;
%template(UnaryFunction0DDouble)           UnaryFunction0D<double>;
%template(UnaryFunction0DVec2f)            UnaryFunction0D<Vec2f>;
%template(UnaryFunction0DVec3f)            UnaryFunction0D<Vec3f>;
%template(UnaryFunction0DId)               UnaryFunction0D<Id>;
%template(UnaryFunction0DViewShape)        UnaryFunction0D<ViewShape*>;
%template(UnaryFunction0DVectorViewShape)  UnaryFunction0D<std::vector<ViewShape*> >;
#endif  // SWIG

//
// Functions definitions
//
///////////////////////////////////////////////////////////
class ViewShape;

namespace Functions0D {

// GetXF0D
/** Returns the X 3D coordinate of an Interface0D. */
class GetXF0D : public UnaryFunction0D<double> {
 public:
  /** Returns the string "GetXF0D" */
  string getName() const
  {
    return "GetXF0D";
  }

  /** the () operator. */
  int operator()(Interface0DIterator &iter)
  {
    result = iter->getX();
    return 0;
  }
};

// GetYF0D
/** Returns the Y 3D coordinate of an Interface0D. */
class GetYF0D : public UnaryFunction0D<double> {
 public:
  /** Returns the string "GetYF0D" */
  string getName() const
  {
    return "GetYF0D";
  }

  /** the () operator. */
  int operator()(Interface0DIterator &iter)
  {
    result = iter->getY();
    return 0;
  }
};

// GetZF0D
/** Returns the Z 3D coordinate of an Interface0D. */
class GetZF0D : public UnaryFunction0D<double> {
 public:
  /** Returns the string "GetZF0D" */
  string getName() const
  {
    return "GetZF0D";
  }

  /** the () operator. */
  int operator()(Interface0DIterator &iter)
  {
    result = iter->getZ();
    return 0;
  }
};

// GetProjectedXF0D
/** Returns the X 3D projected coordinate of an Interface0D. */
class GetProjectedXF0D : public UnaryFunction0D<double> {
 public:
  /** Returns the string "GetProjectedXF0D" */
  string getName() const
  {
    return "GetProjectedXF0D";
  }

  /** the () operator. */
  int operator()(Interface0DIterator &iter)
  {
    result = iter->getProjectedX();
    return 0;
  }
};

// GetProjectedYF0D
/** Returns the Y projected 3D coordinate of an Interface0D. */
class GetProjectedYF0D : public UnaryFunction0D<double> {
 public:
  /** Returns the string "GetProjectedYF0D" */
  string getName() const
  {
    return "GetProjectedYF0D";
  }

  /** the () operator. */
  int operator()(Interface0DIterator &iter)
  {
    result = iter->getProjectedY();
    return 0;
  }
};

// GetProjectedZF0D
/** Returns the Z projected 3D coordinate of an Interface0D. */
class GetProjectedZF0D : public UnaryFunction0D<double> {
 public:
  /** Returns the string "GetProjectedZF0D" */
  string getName() const
  {
    return "GetProjectedZF0D";
  }

  /** the () operator. */
  int operator()(Interface0DIterator &iter)
  {
    result = iter->getProjectedZ();
    return 0;
  }
};

// GetCurvilinearAbscissaF0D
/** Returns the curvilinear abscissa of an Interface0D in the context of its 1D element. */
class GetCurvilinearAbscissaF0D : public UnaryFunction0D<float> {
 public:
  /** Returns the string "GetCurvilinearAbscissaF0D" */
  string getName() const
  {
    return "GetCurvilinearAbscissaF0D";
  }

  /** the () operator. */
  int operator()(Interface0DIterator &iter)
  {
    result = iter.t();
    return 0;
  }
};

// GetParameterF0D
/** Returns the parameter of an Interface0D in the context of its 1D element. */
class GetParameterF0D : public UnaryFunction0D<float> {
 public:
  /** Returns the string "GetCurvilinearAbscissaF0D" */
  string getName() const
  {
    return "GetParameterF0D";
  }

  /** the () operator. */
  int operator()(Interface0DIterator &iter)
  {
    result = iter.u();
    return 0;
  }
};

// VertexOrientation2DF0D
/** Returns a Vec2r giving the 2D oriented tangent to the 1D element to which the
 * Interface0DIterator& belongs to and evaluated at the Interface0D pointed by this
 * Interface0DIterator&.
 */
class VertexOrientation2DF0D : public UnaryFunction0D<Vec2f> {
 public:
  /** Returns the string "VertexOrientation2DF0D" */
  string getName() const
  {
    return "VertexOrientation2DF0D";
  }

  /** the () operator. */
  int operator()(Interface0DIterator &iter);
};

// VertexOrientation3DF0D
/** Returns a Vec3r giving the 3D oriented tangent to the 1D element to which the
 * Interface0DIterator& belongs to and evaluated at the Interface0D pointed by this
 * Interface0DIterator&.
 */
class VertexOrientation3DF0D : public UnaryFunction0D<Vec3f> {
 public:
  /** Returns the string "VertexOrientation3DF0D" */
  string getName() const
  {
    return "VertexOrientation3DF0D";
  }

  /** the () operator. */
  int operator()(Interface0DIterator &iter);
};

// Curvature2DAngleF0D
/** Returns a real giving the 2D curvature (as an angle) of the 1D element to which the
 * Interface0DIterator& belongs to and evaluated at the Interface0D pointed by this
 * Interface0DIterator&.
 */
class Curvature2DAngleF0D : public UnaryFunction0D<double> {
 public:
  /** Returns the string "Curvature2DAngleF0D" */
  string getName() const
  {
    return "Curvature2DAngleF0D";
  }

  /** the () operator. */
  int operator()(Interface0DIterator &iter);
};

// ZDiscontinuity
/** Returns a real giving the distance between and Interface0D and the shape that lies behind
 * (occludee). This distance is evaluated in the camera space and normalized between 0 and 1.
 * Therefore, if no object is occluded by the shape to which the Interface0D belongs to, 1 is
 * returned.
 */
class ZDiscontinuityF0D : public UnaryFunction0D<double> {
 public:
  /** Returns the string "ZDiscontinuityF0D" */
  string getName() const
  {
    return "ZDiscontinuityF0D";
  }

  /** the () operator. */
  int operator()(Interface0DIterator &iter);
};

// Normal2DF0D
/** Returns a Vec2f giving the normalized 2D normal to the 1D element to which the
 * Interface0DIterator& belongs to and evaluated at the Interface0D pointed by this
 * Interface0DIterator&.
 */
class Normal2DF0D : public UnaryFunction0D<Vec2f> {
 public:
  /** Returns the string "Normal2DF0D" */
  string getName() const
  {
    return "Normal2DF0D";
  }

  /** the () operator. */
  int operator()(Interface0DIterator &iter);
};

// MaterialF0D
/** Returns the material of the object evaluated at the Interface0D.
 *  This evaluation can be ambiguous (in the case of a TVertex for example.
 *  This functor tries to remove this ambiguity using the context offered by the 1D element to
 * which the Interface0DIterator& belongs to and by arbitrary choosing the material of the face
 * that lies on its left when following the 1D element if there are two different materials on each
 * side of the point. However, there still can be problematic cases, and the user willing to deal
 * with this cases in a specific way should implement its own getMaterial functor.
 */
class MaterialF0D : public UnaryFunction0D<FrsMaterial> {
 public:
  /** Returns the string "MaterialF0D" */
  string getName() const
  {
    return "MaterialF0D";
  }

  /** the () operator. */
  int operator()(Interface0DIterator &iter);
};

// ShapeIdF0D
/** Returns the Id of the Shape the Interface0D belongs to.
 *  This evaluation can be ambiguous (in the case of a TVertex for example).
 *  This functor tries to remove this ambiguity using the context offered by the 1D element to
 * which the Interface0DIterator& belongs to. However, there still can be problematic cases, and
 * the user willing to deal with this cases in a specific way should implement its own
 * getShapeIdF0D functor.
 */
class ShapeIdF0D : public UnaryFunction0D<Id> {
 public:
  /** Returns the string "ShapeIdF0D" */
  string getName() const
  {
    return "ShapeIdF0D";
  }

  /** the () operator. */
  int operator()(Interface0DIterator &iter);
};

// QiF0D
/** Returns the quantitative invisibility of this Interface0D.
 *  This evaluation can be ambiguous (in the case of a TVertex for example).
 *  This functor tries to remove this ambiguity using the context offered by the 1D element to
 * which the Interface0DIterator& belongs to. However, there still can be problematic cases, and
 * the user willing to deal with this cases in a specific way should implement its own getQIF0D
 * functor.
 */
class QuantitativeInvisibilityF0D : public UnaryFunction0D<uint> {
 public:
  /** Returns the string "QuantitativeInvisibilityF0D" */
  string getName() const
  {
    return "QuantitativeInvisibilityF0D";
  }

  /** the () operator. */
  int operator()(Interface0DIterator &iter);
};

// CurveNatureF0D
/** Returns the Nature::EdgeNature of the 1D element the Interface0DIterator& belongs to. */
class CurveNatureF0D : public UnaryFunction0D<Nature::EdgeNature> {
 public:
  /** Returns the string "QuantitativeInvisibilityF0D" */
  string getName() const
  {
    return "CurveNatureF0D";
  }

  /** the () operator. */
  int operator()(Interface0DIterator &iter);
};

// GetShapeF0D
/** Returns the ViewShape* containing the Interface0D */
class GetShapeF0D : public UnaryFunction0D<ViewShape *> {
 public:
  /** Returns the string "GetShapeF0D" */
  string getName() const
  {
    return "GetShapeF0D";
  }

  /** the () operator. */
  int operator()(Interface0DIterator &iter);
};

// GetOccludersF0D
/** Returns a vector containing the ViewShape* occluding the Interface0D */
class GetOccludersF0D : public UnaryFunction0D<std::vector<ViewShape *>> {
 public:
  /** Returns the string "GetOccludersF0D" */
  string getName() const
  {
    return "GetOccludersF0D";
  }

  /** the () operator. */
  int operator()(Interface0DIterator &iter);
};

// GetOccludeeF0D
/** Returns the ViewShape* "occluded" by the Interface0D */
class GetOccludeeF0D : public UnaryFunction0D<ViewShape *> {
 public:
  /** Returns the string "GetOccludeeF0D" */
  string getName() const
  {
    return "GetOccludeeF0D";
  }

  /** the () operator. */
  int operator()(Interface0DIterator &iter);
};

/////////////////////////// Internal ////////////////////////////

// getFEdge
FEdge *getFEdge(Interface0D &it1, Interface0D &it2);

// getFEdges
void getFEdges(Interface0DIterator &it, FEdge *&fe1, FEdge *&fe2);

// getViewEdges
void getViewEdges(Interface0DIterator &it, ViewEdge *&ve1, ViewEdge *&ve2);

// getShapeF0D
ViewShape *getShapeF0D(Interface0DIterator &it);

// getOccludersF0D
void getOccludersF0D(Interface0DIterator &it, std::set<ViewShape *> &oOccluders);

// getOccludeeF0D
ViewShape *getOccludeeF0D(Interface0DIterator &it);

}  // end of namespace Functions0D

} /* namespace Freestyle */
