/****************************************************************************
* 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.                                                         *
*                                                                           *
****************************************************************************/
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#ifndef NXS_BORDERSERVER_H
#define NXS_BORDERSERVER_H

#include <list>
#include <map>

#include "index_file.h"
#include "border.h"


/*nell'header ci sta scritto solo:
  spazio riservato: 2 * sizeof(Link);
   magic: nxb0 (4 bytes)
   offset: (int64) */

namespace nxs {

  //This should be Border class!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
/*struct BorderEntry {
  unsigned int start; //granuralita' Link
  unsigned short size; //in Links             //TODO what are this? be clear!
  unsigned short used; //in Links
  Link *links;
};*/

class BorderServer: public IndexFile<Border> {
 public:
  BorderServer(): ram_max(1000000), ram_used(0) {}
  ~BorderServer() { Close(); }
  bool Create(const std::string &file);
  bool Load(const std::string &file, bool readonly = true);
  void Close();
  void Flush();

  void AddBorder(unsigned short size, unsigned int used = 0);
  Border &GetBorder(unsigned int border, bool flush = true);  
  void ResizeBorder(unsigned int border, unsigned int size);

  /*unsigned int BorderSize(unsigned int i) { 
    return operator[](i).used; 
  }
  unsigned int BorderCapacity(unsigned int i) { 
    return operator[](i).size; 
  } */
 protected:
  unsigned int ram_max;
  unsigned int ram_used;		
  std::list<unsigned int> pqueue;
  std::map<unsigned int, std::list<unsigned int>::iterator> index;

  bool LoadHeader();
  void SaveHeader();
  
  void FlushBorder(unsigned int border);
  Link *GetRegion(unsigned int start, unsigned int size); //size in links.
};

}

#endif