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//=============================================================================
//
//                               OpenFlipper
//        Copyright (C) 2008 by Computer Graphics Group, RWTH Aachen
//                           www.openflipper.org
//
//-----------------------------------------------------------------------------
//
//                                License
//
//  OpenFlipper is free software: you can redistribute it and/or modify
//  it under the terms of the GNU Lesser General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
// 
//  OpenFlipper 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 Lesser General Public License for more details.
// 
//  You should have received a copy of the GNU Lesser General Public License
//  along with OpenFlipper.  If not, see <http://www.gnu.org/licenses/>.
//
//-----------------------------------------------------------------------------
//
//   $Revision: 3469 $
//   $Author: moebius $
//   $Date: 2008-10-17 15:15:46 +0200 (Fr, 17. Okt 2008) $
//
//=============================================================================




//=============================================================================
//
//  CLASS ColorStack
//
//=============================================================================

#ifndef ACG_COLORSTACK_HH
#define ACG_COLORSTACK_HH


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

#include <vector>

#include "gl.hh"
#include "../Math/VectorT.hh"
#include "ColorTranslator.hh"


//== NAMESPACES ===============================================================


namespace ACG {


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


/** This class can be used to implement a gl picking stack based on colors
*/
class ACGDLLEXPORT ColorStack
{
public:
   
  /// Default constructor.
  ColorStack();
   /// Destructor.
  ~ColorStack();

  
  /// init (takes current GL context/ like glInitNames (); glPushName (0))
  void initialize();
  /// has it been initialized?
  bool initialized() const { return initialized_; }

  /// sets the maximum index number used in current node 
  bool setMaximumIndex (unsigned int _idx);

  /// sets the current color the given index (like glLoadName)
  void setIndex (unsigned int _idx);

  /// creates a new node the stack (like glPushName)
  void pushIndex (unsigned int _idx);

  /// pops the current node from the stack (like glPopName)
  void popIndex ();

  /// converts the given color to index values on the stack
  std::vector<unsigned int> colorToStack (Vec3uc _rgb) const;

  /// returns maximal available index count
  unsigned int freeIndicies () const;

  /// Did an error occur during picking
  bool error () const { return error_ && initialized_; };

  /// returns the current color index
  unsigned int currentIndex () const;

private:

  // Internal class used realize the color stack

  class Node {
    public:
      Node (unsigned int _idx, Node *_parent, ColorTranslator *_ct);
      ~Node ();

      /// sets the maximum index number used in current node 
      bool setMaximumIndex (unsigned int _idx);

      /// sets the current color the given index (like glLoadName)
      bool setIndex (unsigned int _idx) const;

      /// creates a new node the stack (like glPushName)
      Node * pushIndex (unsigned int _idx);

      /// pops the current node from the stack (like glPopName)
      Node * popIndex ();

      void colorToStack (std::vector<unsigned int> &_stack, unsigned int _index);

      unsigned int startIndex () { return startIdx_; };
      unsigned int endIndex () { return endIdx_; };
      unsigned int colorIndex () { return colorStartIdx_; };

    private:
      Node                *parent_;
      unsigned int        index_;
      ColorTranslator     *translator_;
      std::vector<Node *> nodes_;

      unsigned int startIdx_;
      unsigned int endIdx_;
      unsigned int colorStartIdx_;
      unsigned int colorEndIdx_;

  };

  bool            initialized_;
  ColorTranslator translator_;
  Node            *root_;
  Node            *currentNode_;
  bool            error_;
};


//=============================================================================
} // namespace ACG
//=============================================================================
#endif // ACG_COLORSTACK_HH defined
//=============================================================================