/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

#ifndef __BLENDER_FILE_LOADER_H__
#define __BLENDER_FILE_LOADER_H__

/** \file
 * \ingroup freestyle
 */

#include <string.h>
#include <float.h>

#include "../geometry/BBox.h"
#include "../geometry/Geom.h"
#include "../geometry/GeomCleaner.h"
#include "../geometry/GeomUtils.h"
#include "../scene_graph/IndexedFaceSet.h"
#include "../scene_graph/NodeGroup.h"
#include "../scene_graph/NodeTransform.h"
#include "../scene_graph/NodeShape.h"
#include "../system/FreestyleConfig.h"
#include "../system/RenderMonitor.h"

#include "MEM_guardedalloc.h"

extern "C" {
#include "DNA_material_types.h"
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "DNA_modifier_types.h"
#include "DNA_object_types.h"
#include "DNA_scene_types.h"

#include "render_types.h"

#include "BKE_customdata.h"
#include "BKE_library.h"
#include "BKE_material.h"
#include "BKE_mesh.h"
#include "BKE_scene.h"

#include "BLI_iterator.h"
#include "BLI_listbase.h"
#include "BLI_math.h"
}

#include "DEG_depsgraph_query.h"

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

namespace Freestyle {

class NodeGroup;

struct LoaderState {
  float *pv;
  float *pn;
  IndexedFaceSet::FaceEdgeMark *pm;
  unsigned *pvi;
  unsigned *pni;
  unsigned *pmi;
  unsigned currentIndex;
  unsigned currentMIndex;
  float minBBox[3];
  float maxBBox[3];
};

class BlenderFileLoader {
 public:
  /*! Builds a MaxFileLoader */
  BlenderFileLoader(Render *re, ViewLayer *view_layer, Depsgraph *depsgraph);
  virtual ~BlenderFileLoader();

  /*! Loads the 3D scene and returns a pointer to the scene root node */
  NodeGroup *Load();

  /*! Gets the number of read faces */
  inline unsigned int numFacesRead()
  {
    return _numFacesRead;
  }

#if 0
  /*! Gets the smallest edge size read */
  inline real minEdgeSize()
  {
    return _minEdgeSize;
  }
#endif

  /*! Modifiers */
  inline void setRenderMonitor(RenderMonitor *iRenderMonitor)
  {
    _pRenderMonitor = iRenderMonitor;
  }

 protected:
  void insertShapeNode(Object *ob, Mesh *mesh, int id);
  int testDegenerateTriangle(float v1[3], float v2[3], float v3[3]);
  int countClippedFaces(float v1[3], float v2[3], float v3[3], int clip[3]);
  void clipLine(float v1[3], float v2[3], float c[3], float z);
  void clipTriangle(int numTris,
                    float triCoords[][3],
                    float v1[3],
                    float v2[3],
                    float v3[3],
                    float triNormals[][3],
                    float n1[3],
                    float n2[3],
                    float n3[3],
                    bool edgeMarks[5],
                    bool em1,
                    bool em2,
                    bool em3,
                    int clip[3]);
  void addTriangle(struct LoaderState *ls,
                   float v1[3],
                   float v2[3],
                   float v3[3],
                   float n1[3],
                   float n2[3],
                   float n3[3],
                   bool fm,
                   bool em1,
                   bool em2,
                   bool em3);

 protected:
  struct detri_t {
    unsigned viA, viB, viP;  // 0 <= viA, viB, viP < viSize
    Vec3r v;
    unsigned n;
  };
  Render *_re;
  Depsgraph *_depsgraph;
  NodeGroup *_Scene;
  unsigned _numFacesRead;
#if 0
  real _minEdgeSize;
#endif
  bool _smooth; /* if true, face smoothness is taken into account */
  float _viewplane_left;
  float _viewplane_right;
  float _viewplane_bottom;
  float _viewplane_top;
  float _z_near, _z_far;
  float _z_offset;

  RenderMonitor *_pRenderMonitor;

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

} /* namespace Freestyle */

#endif  // __BLENDER_FILE_LOADER_H__