/****************************************************************************
* VCGLib                                                            o o     *
* Visual and Computer Graphics Library                            o     o   *
*                                                                _   O  _   *
* Copyright(C) 2004                                                \/)\/    *
* Visual Computing Lab                                            /\/|      *
* ISTI - Italian National Research Council                           |      *
*                                                                    \      *
* All rights reserved.                                                      *
*                                                                           *
* 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 (http://www.gnu.org/licenses/gpl.txt)          *
* for more details.                                                         *
*                                                                           *
****************************************************************************/
/****************************************************************************
  History

$Log: not supported by cvs2svn $
Revision 1.21  2005/02/19 10:45:04  ponchio
Patch generalized and small fixes.

Revision 1.20  2005/02/08 12:43:03  ponchio
Added copyright


****************************************************************************/

#ifndef NXS_NEXUS_H
#define NXS_NEXUS_H

#include <string>
#include <vector>
#include <list>
#include <map>

#include <vcg/space/sphere3.h>

#include "normalscone.h"
#include "patch.h"
#include "index_file.h"
#include "history.h"
#include "borderserver.h"

namespace nxs {

  /* Header fo nexus: 
  1Kb riservato per dati globali:
     Magic:        'n' 'x' 's' 0x00
     Signature:    unsigned int (maschera di bit)
     Chunk size:   unsigned int
     Index offset: unsigned int (offset to the index begin, 
                                 must be a multiple of chunk size)
     History offset: unsigned int: multiple of chunk_size

     Tot vert:     unsigned int
     Tot face:     unsigned int  
     Bound sphere: Sphere3f (4 float: Point3f center (x, y, z), (radius))

     11 * 4 = 44 bytes -> 4k per alignment purpoouses and reserving space. */

struct Entry { 
  unsigned int patch_start;  //granularita' Chunk
  unsigned short ram_size;  //in chunks 
  unsigned short disk_size;  // in chunks (used when compressed)

  unsigned short nvert;
  unsigned short nface;
  
  vcg::Sphere3f sphere;
  float error;
  NCone3s cone;

  Patch *patch;
  unsigned int vbo_array;
  unsigned int vbo_element;
};

class Nexus: public IndexFile<Entry> {
 public:
  enum Version { NXS_CURRENT_VERSION = 1 };
  
  //HEader data:
  Signature signature;
  unsigned int chunk_size;
  //unsigned int .IndexFile::offset;
  int64 history_offset;
  
  unsigned int totvert;
  unsigned int totface;
  vcg::Sphere3f sphere;
  
  History history;

  BorderServer borders;   
  

  Nexus() {}
  ~Nexus();
  
  bool Create(const std::string &filename, Signature &signature,
	      unsigned int chunk_size = 1024);
  bool Load(const std::string &filename, bool readonly = false);
  void Close();
  void Flush(bool all = true);
  
  unsigned int AddPatch(unsigned int nv, unsigned int nf, unsigned int nb);
  Patch &GetPatch(unsigned int patch, bool flush = true);
  Border &GetBorder(unsigned int patch, bool flush = true);

  unsigned int &MaxRam() { return ram_max; }
  //  void AddBorder(unsigned int patch, Link &link);

  //move to nxsalgo!
  void Unify(float threshold = 0.0f);

  bool IsCompressed()    { return signature.compr != 0; }
  bool HasStrips()       { return signature.face == Signature::STRIPS; }
  bool HasColors()       { return signature.vcolor != 0; }
  bool HasNormals()      { return signature.vnorm != 0; }
  bool HasTextures()     { return signature.vtext != 0; }

  unsigned int ram_max;
  unsigned int ram_used;		
 protected:

  std::list<unsigned int> pqueue;
  std::map<unsigned int, std::list<unsigned int>::iterator> index;

  Patch *LoadPatch(unsigned int id);
  virtual void FlushPatch(unsigned int id);

  bool LoadHeader();
  void SaveHeader();
};

}

#endif