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// move.h
#ifndef MOVE_H
#define MOVE_H
// includes
#include "board.h"
#include "util.h"
// constants
const int MoveNone = 0; // HACK: a1a1 cannot be a legal move
const int MoveNull = 11; // HACK: a1d2 cannot be a legal move
const int MoveNormal = 0 << 14;
const int MoveCastle = 1 << 14;
const int MovePromote = 2 << 14;
const int MoveEnPassant = 3 << 14;
const int MoveFlags = 3 << 14;
const int MovePromoteKnight = MovePromote | (0 << 12);
const int MovePromoteBishop = MovePromote | (1 << 12);
const int MovePromoteRook = MovePromote | (2 << 12);
const int MovePromoteQueen = MovePromote | (3 << 12);
const int MoveAllFlags = 0xF << 12;
const char NullMoveString[] = "null"; // "0000" in UCI
// macros
#define MOVE_MAKE(from,to) ((SQUARE_TO_64(from)<<6)|SQUARE_TO_64(to))
#define MOVE_MAKE_FLAGS(from,to,flags) ((SQUARE_TO_64(from)<<6)|SQUARE_TO_64(to)|(flags))
#define MOVE_FROM(move) (SQUARE_FROM_64(((move)>>6)&077))
#define MOVE_TO(move) (SQUARE_FROM_64((move)&077))
#define MOVE_IS_SPECIAL(move) (((move)&MoveFlags)!=MoveNormal)
#define MOVE_IS_PROMOTE(move) (((move)&MoveFlags)==MovePromote)
#define MOVE_IS_EN_PASSANT(move) (((move)&MoveFlags)==MoveEnPassant)
#define MOVE_IS_CASTLE(move) (((move)&MoveFlags)==MoveCastle)
#define MOVE_PIECE(move,board) ((board)->square[MOVE_FROM(move)])
// types
typedef uint16 mv_t;
// functions
extern bool move_is_ok (int move);
extern int move_promote (int move);
extern int move_order (int move);
extern bool move_is_capture (int move, const board_t * board);
extern bool move_is_under_promote (int move);
extern bool move_is_tactical (int move, const board_t * board);
extern int move_capture (int move, const board_t * board);
extern bool move_to_string (int move, char string[], int size);
extern int move_from_string (const char string[], const board_t * board);
#endif // !defined MOVE_H
// end of move.h
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