position.h

/*

    eboard - chess client
    http://www.bergo.eng.br/eboard
    https://github.com/fbergo/eboard
    Copyright (C) 2000-2016 Felipe Bergo
    fbergo/at/gmail/dot/com

    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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

*/



#ifndef POSITION_H
#define POSITION_H 1

#include "eboard.h"
#include "stl.h"

class IntAndString {
 public:
  IntAndString() { references=0; }

  string s;
  int    i;
  int    references;
};

// if only glibc would malloc() corectly, we wouldn't need this ugly duck
class StringCollection {
 public:
  StringCollection();
  ~StringCollection();

  int open();
  void append(char *s);
  void append(string &s);
  void append(char c);
  void close();

  void link(int id);
  void unlink(int id);

  bool isOpen();

  const char *get(int id);
  
 private:
  list<IntAndString> collection;
  int LastId;
  bool amOpen;
};

class SMove {
 public:
  SMove(piece p,int sx,int sy,int dx,int dy);
  int distance();
  int valid();
  int SX,SY,DX,DY;
  piece Piece;
};

class Position {
 public:
  Position();  
  ~Position();

  int operator==(const Position &p);
  int operator!=(const Position &p);
  Position operator=(Position &p);

  void  setStartPos();
  void  setPiece(int col,int row,piece p);
  piece getPiece(int col,int row);  
  void  setLastMove(const char *s);
  void  setLastMove(string &s);
  string &getLastMove();
  string &getMaterialString(variant Vr=REGULAR);
  string &getHouseString();

  void addAnnotation(int id);
  char *getAnnotation();
  void clearAnnotation();  

  string &getFEN();
  void setFEN(const char *fen);

  int  getStockCount(piece p);
  void clearStock();
  void incStockCount(piece p);
  void decStockCount(piece p);

  void  print();
  void  diff(Position &np,vector<SMove *> &sl);
  void  intersection(Position &b);

  void moveAnyNotation(const char *m,piece color,variant Vr=REGULAR);
  void moveStdNotation(const char *m,piece color,variant Vr=REGULAR);
  void moveCartesian(int x1,int y1,int x2,int y2,variant Vr=REGULAR,
		     bool resolvepromotion=false);
  void moveDrop(piece p,int x2,int y2);

  void stdNotationForMove(int x1,int y1,int x2,int y2,piece prom,char *m,
			  variant Vr=REGULAR);
  void SANstring(char *src,char *dest);

  // randomly changes the position to make it "different"
  void  invalidate();

  // checking

  bool isMoveLegalCartesian(int x0,int y0,int x1,int y1,piece mycolor,variant vari);
  bool isDropLegal(piece p,int x1,int y1,piece mycolor,variant vari);

  bool isMate(piece c,variant Vr=REGULAR);
  bool isStalemate(piece c,variant Vr=REGULAR);
  bool isNMDraw(variant Vr=REGULAR); /* no-material draw */

  bool maycastle[4]; // 0=white short, 1=black short, 2=white long, 3=black long
  signed char ep[2]; // enpassant square (ep[0]=-1 for none, ep[0]=-2 for allow any)
  bool sidehint; // used by scratch boards only

 private:
  piece  square[8][8];
  string LastMove;
  string MaterialString;
  string HouseString;

  short int House[5][2]; // {crazy,bug}house stock (P,R,N,B,Q)
  list<int> Annotations;

  static char AnnotationBuffer[512];

  void locate(piece p,int *src,int *dest,int istake,variant Vr=REGULAR);
  void ambiguityCheck(piece p, piece c,int destx,int desty,
		      int exclx,int excly,
		      vector<int> & ambx, vector<int> & amby);
  bool canMove(piece p,piece c,int sx,int sy,int dx,int dy);
  bool isInCheck(piece c,variant Vr=REGULAR);
  bool isSquareInCheck(int x,int y,piece dc,variant Vr=REGULAR);
  void checkCastlingPossibility();

  void stdNotationForMoveInternal(int x1,int y1,int x2,int y2,char *m);
  void makeAtomicExplosion(int x,int y);

  void dropAnnotations();
};

#endif