/* ========================================================================= *
 *                                                                           *
 *                               OpenMesh                                    *
 *           Copyright (c) 2001-2022, RWTH-Aachen University                 *
 *           Department of Computer Graphics and Multimedia                  *
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 * This file is part of OpenMesh.                                            *
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 * ========================================================================= */




#pragma once


//== INCLUDES =================================================================

#include <string>
#include <OpenMesh/Core/IO/MeshIO.hh>
#include <OpenMesh/Core/IO/Options.hh>
#include <OpenMesh/Core/Utils/GenProg.hh>
#include <OpenMesh/Core/Utils/color_cast.hh>
#include <OpenMesh/Core/Mesh/Attributes.hh>
#include <OpenMesh/Tools/Utils/StripifierT.hh>
#include <OpenMesh/Tools/Utils/Timer.hh>
#include <OpenMesh/Apps/QtViewer/QGLViewerWidget.hh>


//== FORWARDS =================================================================

class QImage;


//== CLASS DEFINITION =========================================================

	      
template <typename M>
class MeshViewerWidgetT : public QGLViewerWidget
{

public:

  typedef M                             Mesh;
  typedef OpenMesh::StripifierT<Mesh>   MyStripifier;
public:

  /// default constructor
  explicit MeshViewerWidgetT(QWidget* _parent=0)
    : QGLViewerWidget(_parent),
      f_strips_(false), 
      tex_id_(0),
      tex_mode_(GL_MODULATE),
      strips_(mesh_),
      use_color_(true),
      show_vnormals_(false),
      show_fnormals_(false),
      normal_scale_(1.0)
  {
    add_draw_mode("Points");
    add_draw_mode("Hidden-Line");
#if defined(OM_USE_OSG) && OM_USE_OSG
    add_draw_mode("OpenSG Indices");
#endif
  }
  
  /// destructor
  ~MeshViewerWidgetT() {}
  
public:

  /// open mesh
  virtual bool open_mesh(const char* _filename, OpenMesh::IO::Options _opt);
  
  /// load texture
  virtual bool open_texture( const char *_filename );
  bool set_texture( QImage& _texsrc );
 
  void enable_strips();
  void disable_strips();  
  

  Mesh& mesh() { return mesh_; }
  const Mesh& mesh() const { return mesh_; }
  
protected:
  
  /// inherited drawing method
  virtual void draw_scene(const std::string& _draw_mode) override;
  
protected:
  
  /// draw the mesh
  virtual void draw_openmesh(const std::string& _drawmode);


  void glVertex( const typename Mesh::VertexHandle _vh )
  { glVertex3fv( &mesh_.point( _vh )[0] ); }

  void glVertex( const typename Mesh::Point& _p )
  { glVertex3fv( &_p[0] ); }
  
  void glNormal( const typename Mesh::VertexHandle _vh )
  { glNormal3fv( &mesh_.normal( _vh )[0] ); }

  void glTexCoord( const typename Mesh::VertexHandle _vh )
  { glTexCoord2fv( &mesh_.texcoord(_vh)[0] ); }
  
  void glColor( const typename Mesh::VertexHandle _vh )
  { glColor3ubv( &mesh_.color(_vh)[0] ); }
  
  // face properties

  void glNormal( const typename Mesh::FaceHandle _fh )
  { glNormal3fv( &mesh_.normal( _fh )[0] ); }

  void glColor( const typename Mesh::FaceHandle _fh )
  { glColor3ubv( &mesh_.color(_fh)[0] ); }

  void glMaterial( const typename Mesh::FaceHandle _fh, 
		   int _f=GL_FRONT_AND_BACK, int _m=GL_DIFFUSE )
  { 
    OpenMesh::Vec3f c=OpenMesh::color_cast<OpenMesh::Vec3f>(mesh_.color(_fh));
    OpenMesh::Vec4f m( c[0], c[1], c[2], 1.0f );

    glMaterialfv(_f, _m, &m[0]); 
  }


protected: // Strip support
  
  void compute_strips(void)
  {
    if (f_strips_)
    {
      strips_.clear();
      strips_.stripify();
    }
  }    

protected: // inherited
   
  virtual void keyPressEvent( QKeyEvent* _event) override;

protected:
   
  bool                   f_strips_; // enable/disable strip usage
  GLuint                 tex_id_;
  GLint                  tex_mode_;
  OpenMesh::IO::Options  opt_; // mesh file contained texcoords?
  
  Mesh                   mesh_;
  MyStripifier           strips_;
  bool                   use_color_;
  bool                   show_vnormals_;
  bool                   show_fnormals_;
  float                  normal_scale_;
  OpenMesh::FPropHandleT< typename Mesh::Point > fp_normal_base_;
};


//=============================================================================
#if defined(OM_INCLUDE_TEMPLATES)
#  define OPENMESH_MESHVIEWERWIDGET_TEMPLATES
#  include "MeshViewerWidgetT_impl.hh"
#endif
//=============================================================================

