/*!
  \file object.h
  \brief Contains the Object Class that handles 3D-Objects
*/

#ifndef _OBJECT_H
#define _OBJECT_H

#include <GL/gl.h>
#include <GL/glu.h>

#include "array.h"
#include "material.h"
#include "vector.h"
#include <fstream>

using namespace std;

extern int verbose; //!< Will be removed and added again as a verbose-class.



//! Class that handles 3D-Objects. it can also read them in and display them.
class Object
{
 public:
  Object ();
  Object (char* fileName);
  Object(char* fileName, float scaling);
  ~Object ();
  
  void draw (void) const;
  void draw (int groupNumber) const;
  void draw (char* groupName) const;
  int getGroupCount() const;

 private:
  struct FaceElement
  {
    int vertexNumber;
    int normalNumber;
    int texCoordNumber;
    FaceElement* next;
  };

  //! Face
  struct Face
  {
    int vertexCount;
    FaceElement* firstElem;

    char* materialString;

    Face* next;
  };

  //! Group to handle multiple Objects per obj-file
  struct Group
  {
    char* name;

    GLuint listNumber;
    Face* firstFace;
    Face* currentFace;
    int faceMode;
    int faceCount;

    Group* next;
  };


  Array* vertices;
  int verticesCount;
  Array* colors;
  Array* normals;
  Array* vTexture;

  
  Group* firstGroup; //!< the first of all groups.
  Group* currentGroup; //!< the currentGroup. this is the one we will work with.
  int groupCount;

  Material* material;
  float scaleFactor;

  char* objPath;
  char* objFileName;
  char* mtlFileName;

  bool initialize (void);
  bool initGroup(Group* group);
  bool initFace (Face* face);
  bool cleanup(void);
  bool cleanupGroup(Group* group);
  bool cleanupFace(Face* face);
  bool cleanupFaceElement(FaceElement* faceElem);

  ///// readin ///
  bool importFile (char* fileName);
  bool readFromObjFile (void);
  
  bool readGroup (char* groupString);
  bool readVertex (char* vertexString);
  bool readFace (char* faceString);
  bool readVertexNormal (char* normalString);
  bool readVertexTexture (char* vTextureString);
  bool readMtlLib (char* matFile);
  bool readUseMtl (char* mtlString);

  bool importToGL (void);
  bool addGLElement (FaceElement* elem);

  bool buildVertexNormals ();

  void BoxObject (void);
};

#endif