/* board.h
 *
 */

/*
    fics - An internet chess server.
    Copyright (C) 1993  Richard V. Nash

    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.
*/

/* Revision history:
   name		email		yy/mm/dd	Change
   Richard Nash	              	93/10/22	Created
*/

#ifndef _BOARD_H
#define _BOARD_H

#define WHITE 0x00
#define BLACK 0x80

#define CString(c) (((c) == WHITE) ? "White" : "Black")
#define CToggle(c) (((c) == BLACK) ? WHITE : BLACK)

/*
 * These are indexes into an array so their values are not arbitrary.
 */
#define NOPIECE	0x00
#define PAWN	0x01
#define KNIGHT	0x02
#define BISHOP	0x03
#define ROOK	0x04
#define QUEEN	0x05
#define KING	0x06

#define MAX_BOARD_STRING_LEGTH 1280     /* Arbitrarily 80 * 16 */
#define MAX_STYLES 13

#define W_PAWN		(PAWN | WHITE)
#define W_KNIGHT	(KNIGHT | WHITE)
#define W_BISHOP	(BISHOP | WHITE)
#define W_ROOK		(ROOK | WHITE)
#define W_QUEEN		(QUEEN | WHITE)
#define W_KING		(KING | WHITE)

#define B_PAWN		(PAWN | BLACK)
#define B_KNIGHT	(KNIGHT | BLACK)
#define B_BISHOP	(BISHOP | BLACK)
#define B_ROOK		(ROOK | BLACK)
#define B_QUEEN		(QUEEN | BLACK)
#define B_KING		(KING | BLACK)

#define isblack(p)		((p) & BLACK)
#define iswhite(p)		(!isblack(p))
#define iscolor(p, color)	(((p) & BLACK) == (color))

#define colorval(p)		((p) & 0x80)
#define piecetype(p)		((p) & 0x7f)
#define square_color(r, f)	((((r) + (f)) & 0x01) ? BLACK : WHITE)

/* Treated as [file][rank] */
typedef int board_t[8][8];

typedef struct _game_state_t {
  board_t board;
  /* for bughouse */
  int holding[2][5];
  /* For castling */
  unsigned char wkmoved, wqrmoved, wkrmoved;
  unsigned char bkmoved, bqrmoved, bkrmoved;
  /* for ep */
  int ep_possible[2][8];
  /* For draws */
  int lastIrreversable;
  int onMove;
  int moveNum;
  /* Game num not saved, must be restored when read */
  int gameNum;
} game_state_t;

#define ALG_DROP -2

/* bughouse: if a drop move, then fromFile is ALG_DROP and fromRank is piece */

typedef struct _move_t {
  int color;
  int fromFile, fromRank;
  int toFile, toRank;
  int pieceCaptured;
  int piecePromotionTo;
  int enPassant; /* 0 = no, 1=higher -1= lower */
  int doublePawn; /* Only used for board display */
  char moveString[8];
  char algString[8];
  unsigned char FENpos[74];    /* This replaces the boardList. */
  unsigned atTime;
  unsigned tookTime;
} move_t;

#define MoveToHalfMove( gs ) ((((gs)->moveNum - 1) * 2) + (((gs)->onMove == WHITE) ? 0 : 1))

extern char	*wpstring[];
extern char	*bpstring[];

extern int pieceValues[7];

extern char	*board_to_string(char *, char *, int, int, game_state_t *,
		     move_t *, int, int, int, int);
extern char	*move_and_time(move_t *);
extern int	 board_init(game_state_t *, char *, char *);
extern int	 board_read_file(char *, char *, game_state_t *);
extern void	 board_calc_strength(game_state_t *, int *, int *);
extern void	 update_holding(int, int);
extern void	 wild_init(void);
extern void	 wild_update(int);

#endif