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

 Copyright (C) 2002-2008 Gilles Debunne. All rights reserved.

 This file is part of the QGLViewer library version 2.3.1.

 http://www.libqglviewer.com - contact@libqglviewer.com

 This file may be used under the terms of the GNU General Public License 
 versions 2.0 or 3.0 as published by the Free Software Foundation and
 appearing in the LICENSE file included in the packaging of this file.
 In addition, as a special exception, Gilles Debunne gives you certain 
 additional rights, described in the file GPL_EXCEPTION in this package.

 libQGLViewer uses dual licensing. Commercial/proprietary software must
 purchase a libQGLViewer Commercial License.

 This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

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

#ifndef BOARD_H
#define BOARD_H

#include "move.h"
#include "undo.h"
#include <qstring.h>
#include <qsize.h>
#if QT_VERSION < 0x040000
# include <qvaluevector.h>
#else
# include <qvector.h>
#endif

class Board
{
  friend class Move;
  
public:
  Board() : board_(NULL) {};

  void draw() const;
  void drawShadows() const;
  void drawSelectedPiece(int piece) const;
  void drawPossibleDestinations(int piece, bool select=false) const;
  void drawSelectablePieces() const;

  void play(const Move& m);

  QSize size() const { return QSize(sizeX_, sizeY_); };
  
  QString statusMessage() const;

  bool canBeSelected(int i);

  bool isValid(const QPoint& p) const;
  
  bool gameIsOver() const;
  bool bluePlays() const { return bluePlays_; };

  bool undo();
  bool redo();

#if QT_VERSION < 0x040000
  QValueVector<Move> possibleMoves(bool bluePlays) const;
#else
  QVector<Move> possibleMoves(bool bluePlays) const;
#endif
  Move bestMoveNumberOfNewPieces() const;

  enum State { EMPTY, RED, BLUE, HOLE };
  State stateOf(const QPoint p) const { return (State)board_[p.x()][p.y()]; };

  QString stateString() const;
  void initFromStateString(const QString& s);

  // Used for animation
  void doNotDrawPiece(const QPoint& p) { board_[p.x()][p.y()] = Board::EMPTY; };
  void doDrawPiece(const QPoint& p) { board_[p.x()][p.y()] = blueColor(bluePlays_); };
  void drawFlippingPieces(const QPoint& p, bool flip) const;
  
  static State blueColor(bool blue) { return blue?Board::BLUE:Board::RED; };
  static void drawPiece(bool blue);

  // Input-Output
  friend std::ostream& operator<<(std::ostream& out, const Board& p);
  friend std::istream& operator>>(std::istream& in, Board& b);

private:  
  void resize(int sizeX, int sizeY);
  bool pieceCanMove(const QPoint& p) const;
  void setStateOf(const QPoint& p, State s);
  
  int intFromPoint(const QPoint& p) const { return p.x()*sizeY_ + p.y(); };
  QPoint pointFromInt(int i) const { return QPoint(i/sizeY_, i%sizeY_); };
  
  static void drawBlock(int i, int j);
  static void drawSquare(const QPoint& p);
  static void drawPiece(const QPoint& p, bool blue);
  static void drawShadow(const QPoint& p);

  int sizeX_, sizeY_;
  int** board_;
  int nbBlue_, nbRed_;
  bool bluePlays_;
  Undo undo_;
};

#endif // BOARD_H