/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkOOGLExporter.cxx

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
#include "vtkOOGLExporter.h"

#include "vtkObjectFactory.h"
#include "vtkActorCollection.h"
#include "vtkAssemblyPath.h"
#include "vtkCamera.h"
#include "vtkCellArray.h"
#include "vtkGeometryFilter.h"
#include "vtkImageData.h"
#include "vtkLight.h"
#include "vtkLightCollection.h"
#include "vtkMath.h"
#include "vtkPointData.h"
#include "vtkPolyData.h"
#include "vtkPolyDataMapper.h"
#include "vtkProperty.h"
#include "vtkRenderWindow.h"
#include "vtkRendererCollection.h"
#include "vtkTexture.h"
#include "vtkMatrix4x4.h"

vtkStandardNewMacro(vtkOOGLExporter);

vtkOOGLExporter::vtkOOGLExporter()
{
  this->FileName = nullptr;
}

vtkOOGLExporter::~vtkOOGLExporter()
{
  this->SetFileName( nullptr );
}

static char indent[256];
static int indent_now = 0;

#define VTK_INDENT_MORE { indent[indent_now] = ' '; \
                                          indent_now += 4; \
                                      indent[indent_now] = 0; }
#define VTK_INDENT_LESS { indent[indent_now] = ' '; \
                                          indent_now -= 4; \
                                      indent[indent_now] = 0; }

void vtkOOGLExporter::WriteData()
{
  FILE *fp;
  int i, j;
  vtkActorCollection *ac;
  vtkActor *anActor, *aPart;
  vtkLightCollection *lc;
  vtkLight *aLight;
  vtkCamera *cam;
  int count;
  vtkMatrix4x4 *mat;

  for (i=0;i<256;i++)
  {
    indent[i] = ' ';
  }
  indent[indent_now] = 0;

  // make sure the user specified a filename
  if ( this->FileName == nullptr)
  {
    vtkErrorMacro(<< "Please specify FileName to use");
    return;
  }

  vtkRenderer *ren = this->ActiveRenderer;
  if (!ren)
  {
    ren = this->RenderWindow->GetRenderers()->GetFirstRenderer();
  }

  // make sure it has at least one actor
  if (ren->GetActors()->GetNumberOfItems() < 1)
  {
    vtkErrorMacro(<< "no actors found for writing Geomview OOGL file.");
    return;
  }

  // try opening the files
  fp = fopen(this->FileName,"w");
  if (!fp)
  {
    vtkErrorMacro(<< "unable to open Geomview OOGL file " << this->FileName);
    return;
  }

  //
  //  Write header
  //
  vtkDebugMacro("Writing Geomview OOGL file");
  fprintf(fp,"# Geomview OOGL file written by the visualization toolkit\n\n");
  fprintf(fp,"%s( progn\n", indent);


  VTK_INDENT_MORE;

  //
  // Write out the camera
  //
  cam = ren->GetActiveCamera();

  fprintf(fp, "%s(camera \"Camera\" camera {\n", indent);

  VTK_INDENT_MORE;

  mat = cam->GetViewTransformMatrix();
  fprintf(fp, "%sworldtocam transform {\n", indent);

  VTK_INDENT_MORE;

  for (i=0; i<4;i++)
  {
     fprintf(fp, "%s", indent);
     for (j=0; j < 4; j++)
     {
       fprintf(fp, "%f ", mat->GetElement(j,i));
     }
     fprintf(fp, "\n");
  }

  VTK_INDENT_LESS;
  fprintf(fp, "%s}\n", indent);


  fprintf(fp, "%sperspective %d stereo %d\n", indent,
          !cam->GetParallelProjection(), 0);
  fprintf(fp, "%sfov 40\n", indent);
  fprintf(fp, "%sframeaspect 1\n", indent);
  fprintf(fp, "%sfocus %f\n", indent, cam->GetDistance());
  fprintf(fp, "%snear %f\n", indent, cam->GetClippingRange()[0]);
  fprintf(fp, "%sfar  %f\n", indent, cam->GetClippingRange()[1]);

  VTK_INDENT_LESS;

  fprintf(fp, "%s}\n", indent);

  VTK_INDENT_LESS;

  fprintf(fp, "%s)\n", indent);


  //
  // Write the background colour
  //

  fprintf(fp, "( backcolor \"Camera\" %f %f %f )\n", ren->GetBackground()[0],
          ren->GetBackground()[1],
          ren->GetBackground()[2]);

  //
  // Write out default properties
  //

  fprintf(fp, "( merge-baseap appearance {\n");

  VTK_INDENT_MORE;

  fprintf(fp, "%sface\n%s-edge\n%svect\n%s-transparent\n%severt\n"
          "%sshading flat\n%s-normal\n%snormscale 1\n%slinewidth 1\n"
          "%spatchdice 10 10\n",
          indent, indent, indent, indent, indent,
          indent, indent, indent, indent, indent);
  fprintf(fp, "%slighting {\n", indent);

  VTK_INDENT_MORE;

  fprintf(fp, "%sambient %f %f %f\n", indent, ren->GetAmbient()[0],
          ren->GetAmbient()[1], ren->GetAmbient()[2]);
  fprintf(fp, "%slocalviewer 1\n%sattenconst 1\n%sattenmult 0\n"
          "%s#replacelights\n",
          indent, indent, indent, indent);

  // make sure we have a default light
  // if we don't then use a headlight
  lc = ren->GetLights();
  vtkCollectionSimpleIterator sit;
  for (lc->InitTraversal(sit); (aLight = lc->GetNextLight(sit)); )
  {
    this->WriteALight(aLight, fp);
  }

  VTK_INDENT_LESS;

  fprintf(fp, "%s}\n", indent);

  VTK_INDENT_LESS;

  fprintf(fp, "%s})\n", indent);


  // do the actors now
  ac = ren->GetActors();
  vtkAssemblyPath *apath;
  count = 0;
  vtkCollectionSimpleIterator ait;
  for (ac->InitTraversal(ait); (anActor = ac->GetNextActor(ait)); )
  {
    for (anActor->InitPathTraversal(); (apath=anActor->GetNextPath()); )
    {
      count++;
      aPart=static_cast<vtkActor *>(apath->GetLastNode()->GetViewProp());
      this->WriteAnActor(aPart, fp, count);
    }
  }

  fclose(fp);
}

void vtkOOGLExporter::WriteALight(vtkLight *aLight, FILE *fp)
{
  double *pos, *focus, *color;
  float dir[3];

  pos = aLight->GetPosition();
  focus = aLight->GetFocalPoint();
  color = aLight->GetDiffuseColor();

  dir[0] = focus[0] - pos[0];
  dir[1] = focus[1] - pos[1];
  dir[2] = focus[2] - pos[2];
  vtkMath::Normalize(dir);

   fprintf(fp, "%slight {\n", indent);

   VTK_INDENT_MORE;

   fprintf(fp, "%sambient 0.00 0.00 0.00\n", indent);
   fprintf(fp, "%scolor   %f %f %f\n", indent, color[0], color[1], color[2]);
   fprintf(fp, "%sposition %f %f %f %f\n", indent, pos[0], pos[1], pos[2],
           0.0);

   VTK_INDENT_LESS;

   fprintf(fp, "%s}\n", indent);
}

void vtkOOGLExporter::WriteAnActor(vtkActor *anActor, FILE *fp, int count)
{
  vtkDataSet *ds;
  vtkPolyData *pd;
  vtkGeometryFilter *gf = nullptr;
  vtkPoints *points;
  int i;
  vtkProperty *prop;
  static double defcolor[3] = {  1.0, 1.0, 1.0 };
  double *tempd = defcolor;
  vtkCellArray *cells;
  vtkIdType npts = 0;
  vtkIdType *indx = nullptr;
  double tempf2=0;
  vtkPolyDataMapper *pm;
  vtkUnsignedCharArray *colors;

  double p[3];
  unsigned char *c;

  // see if the actor has a mapper. it could be an assembly
  if (anActor->GetMapper() == nullptr)
  {
    return;
  }

  fprintf(fp,"%s(new-geometry \"[g%d]\"\n", indent, count);

  VTK_INDENT_MORE;

  // get the mappers input and matrix
  ds = anActor->GetMapper()->GetInput();

  vtkAlgorithmOutput* pdProducer = nullptr;
  // we really want polydata
  if ( ds->GetDataObjectType() != VTK_POLY_DATA )
  {
    gf = vtkGeometryFilter::New();
    gf->SetInputConnection(
      anActor->GetMapper()->GetInputConnection(0, 0));
    gf->Update();
    pd = gf->GetOutput();
    pdProducer = gf->GetOutputPort();
  }
  else
  {
    anActor->GetMapper()->GetInputAlgorithm()->Update();
    pd = static_cast<vtkPolyData *>(ds);
    pdProducer = anActor->GetMapper()->GetInputConnection(0, 0);
  }

  pm = vtkPolyDataMapper::New();
  pm->SetInputConnection(pdProducer);
  pm->SetScalarRange(anActor->GetMapper()->GetScalarRange());
  pm->SetScalarVisibility(anActor->GetMapper()->GetScalarVisibility());
  pm->SetLookupTable(anActor->GetMapper()->GetLookupTable());

  points = pd->GetPoints();

  // usage of GetColors() has been deprecated in VTK 4.0
  colors  = pm->MapScalars(1.0);

  // Get the material properties
  prop = anActor->GetProperty();

   // start an INST object
   fprintf(fp, "%s{ INST\n", indent);

   VTK_INDENT_MORE

   // start a LIST object
   fprintf(fp, "%sgeom { LIST\n", indent);

   VTK_INDENT_MORE;

   // extract vector information
   if (pd->GetNumberOfLines())
   {
     fprintf(fp, "%s{ VECT\n", indent);

     VTK_INDENT_MORE;

     // write out the header line
     cells = pd->GetLines();
     i = 0;
     for (cells->InitTraversal(); cells->GetNextCell(npts,indx); )
     {
       i += npts;
     }
     fprintf(fp, "%s%d %d %d\n", indent, static_cast<int>(pd->GetNumberOfLines()), i, 1);
     cells = pd->GetLines();
     fprintf(fp, "%s", indent);
     for (cells->InitTraversal(); cells->GetNextCell(npts,indx); )
     {
       fprintf(fp, "%d ", static_cast<int>(npts));
     }
     fprintf(fp, "\n");

     // write out # of color information
     fprintf(fp, "%s1 ", indent);
     for (i=1; i<pd->GetNumberOfLines(); i++)
     {
       fprintf(fp, "0 ");
     }
     fprintf(fp, "\n");


     // write out points
     cells = pd->GetLines();
     for (cells->InitTraversal(); cells->GetNextCell(npts,indx); )
     {
       fprintf(fp, "%s", indent);
       for (i=0;i<npts;i++)
       {
         double *pt = points->GetPoint(indx[i]);
         fprintf(fp, "%s%f %f %f ", indent, pt[0], pt[1], pt[2]);
       }
       fprintf(fp, "\n");
     }

     // write out color indices
     tempd = prop->GetColor();
     fprintf(fp, "%f %f %f 1\n", tempd[0], tempd[1], tempd[2]);
     fprintf(fp, "}\n");

     VTK_INDENT_LESS;
   }

   // extract polygon information (includes triangle strips)

   if (pd->GetNumberOfPolys() || pd->GetNumberOfStrips())
   {
     fprintf(fp, "%s{ %sOFF\n", indent, (colors) ? "C" : "");

     VTK_INDENT_MORE;

     // write header
     if (pd->GetNumberOfPolys())
     {
       fprintf(fp, "%s%d %d %d\n", indent, static_cast<int>(points->GetNumberOfPoints()),
               static_cast<int>(pd->GetNumberOfPolys()), 0);
     }
     else
     {
       // Handle triangle strips
       //
       i = 0;
       cells = pd->GetStrips();
       for (cells->InitTraversal(); cells->GetNextCell(npts,indx); )
       {
         i += (npts-2);
       }
       fprintf(fp, "%s%d %d %d\n", indent, static_cast<int>(points->GetNumberOfPoints()), i, 0);
     }

      // write points
      if (colors)
      {
        for (i = 0; i < points->GetNumberOfPoints(); i++)
        {
          double *pt = points->GetPoint(i);
          c = static_cast<unsigned char *>(colors->GetPointer(4*i));

          fprintf (fp,"%s%g %g %g %g %g %g %g\n", indent,
                   pt[0], pt[1], pt[2],
                   c[0]/255., c[1]/255., c[2]/255., c[3]/255.);
        }
      }
      else
      {
        for (i = 0; i < points->GetNumberOfPoints(); i++)
        {
          double *pt = points->GetPoint(i);
          fprintf (fp,"%s%g %g %g\n", indent, pt[0], pt[1], pt[2]);
        }
      }

      // write polys
      if (pd->GetNumberOfPolys())
      {
        cells = pd->GetPolys();
        for (cells->InitTraversal(); cells->GetNextCell(npts,indx); )
        {
          fprintf(fp, "%s%i ", indent, static_cast<int>(npts));
          for (i = 0; i < npts; i++)
          {
#ifdef VTK_USE_64BIT_IDS
            fprintf(fp, "%lld ", indx[i]);
#else  // VTK_USE_64BIT_IDS
            fprintf(fp, "%d ", indx[i]);
#endif // VTK_USE_64BIT_IDS
          }
          fprintf(fp, "\n");
        }
        fprintf(fp, "%s}\n", indent); // finish of polygon list

        VTK_INDENT_LESS;

      }

      else if (pd->GetNumberOfStrips())
      { // write triangle strips
        cells = pd->GetStrips();

        for (cells->InitTraversal(); cells->GetNextCell(npts,indx); )
        {
          int pt1, pt2, pt3;

          pt1 = indx[0];
          pt2 = indx[1];

          for (i = 0; i < (npts - 2); i++)
          {
            pt3 = indx[i+2];
            if (i % 2)
            {
              fprintf(fp, "%s3 %d %d %d\n", indent, pt2, pt1, pt3);
            }
            else
            {
              fprintf(fp, "%s3 %d %d %d\n", indent, pt1, pt2, pt3);
            }
            pt1 = pt2;
            pt2 = pt3;
          }
        }
        fprintf(fp, "%s}\n", indent); // Finish off triangle strips

        VTK_INDENT_LESS;
      }
   }

   fprintf(fp, "%s}\n", indent); // End of list object

   VTK_INDENT_LESS;

   // Get the actor's position
   anActor->GetPosition(p);

   fprintf(fp, "transform {1 0 0 0 0 1 0 0 0 0 1 0 %f %f %f 1}\n", p[0], p[1], p[2]);

   VTK_INDENT_LESS;

   fprintf(fp, "%s}\n", indent); // Finish off INST command

   VTK_INDENT_LESS;

   fprintf(fp, "%s)\n", indent); // Finish off new-geometry command

   // turn off the bounding box, set normalization to none
   fprintf(fp, "( bbox-draw \"[g%d]\" off )\n", count);
   fprintf(fp, "( normalization \"[g%d]\" none )\n", count);

   fprintf(fp, "( merge-ap \"[g%d]\" appearance {\n", count);

   VTK_INDENT_MORE;

   // Set shading model
   if (prop->GetInterpolation() > 0)
   {
     fprintf(fp, "%sshading smooth\n", indent);
   }

   // Set transparency
   if (prop->GetOpacity() < 1)
   {
     fprintf(fp, "%s+transparent\n", indent);
   }

   // Set representation - no way to render points
   if (prop->GetRepresentation() != 2)
   {
     fprintf(fp, "%s+edge\n%s-face\n", indent, indent);
   }

   // Set edge information
   fprintf(fp, "%slinewidth %d\n", indent, static_cast<int>(prop->GetLineWidth()));

   // Now the material information
   fprintf(fp, "%smaterial {\n", indent);

   VTK_INDENT_MORE;

  // Indicate whether edges are shown or not
   if (prop->GetEdgeVisibility())
   {
     tempd = prop->GetEdgeColor();
   }
   if (prop->GetRepresentation() != 2)
   {
     tempd = prop->GetColor();
   }
  if (prop->GetEdgeVisibility() || (prop->GetRepresentation() != 2))
  {
    fprintf(fp, "%sedgecolor %f %f %f\n", indent,
            tempd[0], tempd[1], tempd[2]);
  }

  tempf2 = prop->GetAmbient();
  tempd = prop->GetAmbientColor();
  fprintf(fp, "%ska %f\n", indent, tempf2);
  fprintf(fp, "%sambient %f %f %f\n", indent, tempd[0], tempd[1], tempd[2]);
  tempf2 = prop->GetDiffuse();
  tempd = prop->GetDiffuseColor();
  fprintf(fp, "%skd %f\n", indent, tempf2);
  fprintf(fp, "%sdiffuse %f %f %f\n", indent, tempd[0], tempd[1], tempd[2]);
  tempf2 = prop->GetSpecular();
  tempd = prop->GetSpecularColor();
  fprintf(fp, "%sks %f\n", indent, tempf2);
  fprintf(fp, "%sspecular %f %f %f\n", indent, tempd[0], tempd[1], tempd[2]);
  if (prop->GetOpacity() < 1)
  {
    fprintf(fp, "%salpha %f\n", indent, prop->GetOpacity());
  }

  fprintf(fp, "%s}\n", indent);

  VTK_INDENT_LESS;

  fprintf(fp, "%s}\n", indent);

  VTK_INDENT_LESS;

  fprintf(fp, ")\n");

  if (gf)
  {
    gf->Delete();
  }
  pm->Delete();
}



void vtkOOGLExporter::PrintSelf(ostream& os, vtkIndent ind)
{
  vtkExporter::PrintSelf(os,ind);

  if (this->FileName)
  {
    os << ind << "FileName: " << this->FileName << "\n";
  }
  else
  {
    os << ind << "FileName: (null)\n";
  }
}

