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+/*
+ * Sudoku: A plug-in for the Video Disk Recorder
+ *
+ * Copyright (C) 2008, Thomas Günther <tom@toms-cafe.de>
+ *
+ * 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 for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * $Id: history.h 140 2008-06-30 22:10:38Z tom $
+ */
+
+#ifndef VDR_SUDOKU_HISTORY_H
+#define VDR_SUDOKU_HISTORY_H
+
+#include "sudoku.h"
+
+
+namespace Sudoku
+{
+  class PuzzleGame;
+  class Pos;
+  class Move;
+  typedef Vector<Move*> Moves;
+
+
+  //--- class Sudoku::History --------------------------------------------------
+
+  class History
+  {
+  private:
+    Moves history;
+    unsigned int executed;
+
+  public:
+
+    /** Constructor */
+    History();
+
+    /** Destructor */
+    ~History();
+
+    /** Reset the history. */
+    void reset();
+
+    /** Current move in the history */
+    Move* current();
+
+    /** Add a new move */
+    void add(Move* move);
+
+    /** Set previous move as current */
+    void backward();
+
+    /** Set next move as current */
+    void forward();
+
+    /** Are there executed moves in the history */
+    bool movesExecuted();
+
+    /** Are there moves to execute in the history */
+    bool movesToExecute();
+  };
+
+
+  //--- class Sudoku::Move -----------------------------------------------------
+
+  class Move
+  {
+  public:
+
+    /** Destructor */
+    virtual ~Move() {};
+
+    /** Do the move */
+    virtual void execute() = 0;
+
+    /** Undo the move. */
+    virtual void takeBack() = 0;
+  };
+
+
+  //--- class Sudoku::SetMove --------------------------------------------------
+
+  class SetMove : public Move
+  {
+  private:
+    PuzzleGame& puzzle;
+    unsigned int pos;
+    unsigned int old_number;
+    unsigned int new_number;
+
+  public:
+
+    /** Constructor */
+    SetMove(PuzzleGame& puzzle, unsigned int number);
+
+    /** Do the move. */
+    void execute();
+
+    /** Undo the move. */
+    void takeBack();
+  };
+
+} // namespace Sudoku
+
+#endif // VDR_SUDOKU_HISTORY_H