engine.h

#ifndef PACHI_ENGINE_H
#define PACHI_ENGINE_H

#include "gtp.h"
#include "ownermap.h"

typedef struct {
	char *name;
	char *val;
} option_t;

#define ENGINE_OPTIONS_MAX 50

typedef struct {
	option_t o[ENGINE_OPTIONS_MAX];
	int      n;
} options_t;


enum engine_id {
	E_UCT,
#ifdef DCNN
	E_DCNN,
#ifdef EXTRA_ENGINES
	E_BLUNDERSCAN,
#endif
#endif
	E_PATTERN,
#ifdef EXTRA_ENGINES
	E_PATTERNSCAN,
#endif
	E_JOSEKI,
	E_JOSEKILOAD,
#ifdef JOSEKIFIX
	E_JOSEKIFIXLOAD,
#endif
	E_RANDOM,
	E_REPLAY,
	E_MONTECARLO,
#ifdef DISTRIBUTED
	E_DISTRIBUTED,
#endif
#ifdef JOSEKIFIX
	E_EXTERNAL,
#endif
	E_MAX,
};


typedef struct engine engine_t;

typedef void (*engine_init_t)(engine_t *e, board_t *b);
typedef bool (*engine_setoption_t)(engine_t *e, board_t *b, const char *optname, char *optval, char **err, bool setup, bool *reset);
typedef enum parse_code (*engine_notify_t)(engine_t *e, board_t *b, int id, char *cmd, char *args, gtp_t *gtp);
typedef void (*engine_board_print_t)(engine_t *e, board_t *b, FILE *f);
typedef char *(*engine_notify_play_t)(engine_t *e, board_t *b, move_t *m, char *enginearg, bool *print_board);
typedef char *(*engine_chat_t)(engine_t *e, board_t *b, bool in_game, char *from, char *cmd);
typedef coord_t (*engine_genmove_t)(engine_t *e, board_t *b, time_info_t *ti, enum stone color, bool pass_all_alive);
typedef char *(*engine_genmoves_t)(engine_t *e, board_t *b, time_info_t *ti, enum stone color,
				   char *args, bool pass_all_alive, void **stats_buf, int *stats_size);
typedef void  (*engine_best_moves_t)(engine_t *e, board_t *b, time_info_t *ti, enum stone color, 
				     coord_t *best_c, float *best_r, int nbest);
typedef void (*engine_analyze_t)(engine_t *e, board_t *b, enum stone color, int start);
typedef void (*engine_evaluate_t)(engine_t *e, board_t *b, time_info_t *ti, floating_t *vals, enum stone color);
typedef void (*engine_dead_groups_t)(engine_t *e, board_t *b, move_queue_t *mq);
typedef ownermap_t* (*engine_ownermap_t)(engine_t *e, board_t *b);
typedef char *(*engine_result_t)(engine_t *e, board_t *b);
typedef void (*engine_stop_t)(engine_t *e);
typedef void (*engine_done_t)(engine_t *e);


/* Engine data structure. A new engine instance is spawned
 * for each new game during the program lifetime. */
struct engine {
	int   id;
	char *name;
	char *comment;

	options_t options;

	bool keep_on_clear;			    /* If set, do not reset the engine state on clear_board. */

	engine_setoption_t       setoption;	    /* Set/change engine option. Don't call directly.
						     * @optname/@optval: option name/value. @optval may be changed by engine.
						     * Returns true on success, otherwise @err has error msg.
						     * @setup: true if called during engine setup.
						     * @reset: set by engine if option can only be set at setup time. */

	engine_notify_t          notify;
	engine_board_print_t     board_print;
	engine_notify_play_t     notify_play;
	engine_chat_t            chat;

	engine_genmove_t         genmove;           /* Generate a move. If pass_all_alive is true, <pass> shall be generated only */
	engine_genmove_t         genmove_analyze;   /* if all stones on the board can be considered alive, without regard to "dead" */
						    /* considered stones. */
	engine_genmoves_t        genmoves;	    /* Used by distributed engine */
	engine_best_moves_t      best_moves;	    /* List best moves for current position.
						     * Call engine_best_move() for data to be initialized correctly. */
	engine_analyze_t         analyze;	    /* Tell engine to start pondering for the sake of frontend running Pachi. */

	engine_evaluate_t        evaluate;	    /* Evaluate feasibility of player @color playing at all free moves. Will
						     * simulate each move from b->f[i] for time @ti, then set
						     * 1-max(opponent_win_likelihood) in vals[i]. */

	engine_dead_groups_t     dead_groups;       /* One dead group per queued move (coord_t is (ab)used as group_t). */
	engine_ownermap_t        ownermap;	    /* Return current ownermap, if engine supports it. */
	engine_result_t          result;

	engine_stop_t            stop;		    /* Pause any background thinking being done, but do not tear down
						     * any data structures yet. */
	engine_done_t            done;		    /* e->data and e will be free()d by caller afterwards. */

	void *data;
};


/* Initialize engine. Call engine_done() later when finished with it. */
void engine_init(engine_t *e, int id, const char *e_arg, board_t *b);

/* Clean up what engine_init() did. */
void engine_done(engine_t *e);

/* Allocate and initialize a new engine.
 * Call delete_engine() when done. */
engine_t* new_engine(int id, const char *e_arg, board_t *b);
void delete_engine(engine_t **e);

/* engine_done() + engine_init(), more or less. */
void engine_reset(engine_t *e, board_t *b);


/* Convenience functions for engine actions: */
void engine_board_print(engine_t *e, board_t *b, FILE *f);
void engine_best_moves(engine_t *e, board_t *b, time_info_t *ti, enum stone color,
		       coord_t *best_c, float *best_r, int nbest);
struct ownermap* engine_ownermap(engine_t *e, board_t *b);
/* Ask engine for dead stones */
void engine_dead_groups(engine_t *e, board_t *b, move_queue_t *mq);

/* Set/change engine option(s). May reset engine if needed.
 * New options are saved, so persist across engine resets.
 * Returns true if successful, otherwise @err has error msg. */
bool engine_setoptions(engine_t *e, board_t *b, const char *arg, char **err);
/* For engines internal use, ensures optval is properly strdup'ed / freed since engine may change it. */
bool engine_setoption(engine_t *e, board_t *b, option_t *option, char **err, bool setup, bool *reset);


/* Engines best moves common code */

/* For engines best_move(): Add move @c with prob @r to best moves @best_c, @best_r */
void best_moves_add(coord_t c, float r, coord_t *best_c, float *best_r, int nbest);
void best_moves_add_full(coord_t c, float r, void *d, coord_t *best_c, float *best_r, void **best_d, int nbest);
int  best_moves_print(board_t *b, char *str, coord_t *best_c, int nbest);


/* Engine options */

void      engine_options_print(options_t *options);
option_t *engine_options_lookup(options_t *options, const char *name);
void      engine_options_concat(strbuf_t *buf, options_t *options);

/* For options which need to be set at engine setup time: */
#define ENGINE_SETOPTION_NEED_RESET  \
	do {  if (!setup) {  *reset = true; return false;  } } while(0);

#define engine_setoption_error(fmt, ...)  \
	do { \
		sbprintf(ebuf, fmt, __VA_ARGS__); \
		*err = ebuf->str; \
		return false; \
	} while(0)


#endif