#ifndef HYBBX_CHESS_H
#define HYBBX_CHESS_H

#include "hybbx/types.h"
#include "hybbx/limits.h"
#include "hybbx/storage.h"

#ifdef __cplusplus
extern "C" {
#endif

#define CHESS_BOARD_SIZE    8
#define CHESS_SQ_MAX        4
#define CHESS_MOVE_MAX      8
#define CHESS_SAN_MAX       8
#define CHESS_GAME_MAX      16  /* array upper bound */
#define CHESS_SPECTATOR_MAX 32
#define CHESS_REFRESH_SEC   15
#define CHESS_DEFAULT_MAX   8   /* default active games if INI omits [chess] */

#define CHESS_EMPTY '.'

typedef enum {
    CHESS_COLOR_NONE = 0,
    CHESS_WHITE,
    CHESS_BLACK
} chess_color_t;

typedef enum {
    CHESS_RESULT_NONE = 0,
    CHESS_WHITE_WINS,
    CHESS_BLACK_WINS,
    CHESS_DRAW_STALEMATE,
    CHESS_DRAW_AGREEMENT
} chess_result_t;

typedef struct chess_board {
    char sq[CHESS_BOARD_SIZE][CHESS_BOARD_SIZE];
} chess_board_t;

typedef struct chess_game {
    int                 active;
    char                white_name[HYBBX_USER_NAME_MAX];
    char                black_name[HYBBX_USER_NAME_MAX];
    struct hybbx_session *white_session;
    struct hybbx_session *black_session;
    struct hybbx_session *spectators[CHESS_SPECTATOR_MAX];
    unsigned            spectator_count;
    chess_board_t       board;
    chess_color_t       turn;
    unsigned            move_number;
    chess_result_t      result;
    char                last_move_san[CHESS_SAN_MAX];
    unsigned            tick_counter;
    char                game_id[8];
} chess_game_t;

void hybbx_chess_init(void);
void hybbx_chess_shutdown(void);
void hybbx_chess_config_apply(const struct hybbx_config *config);
unsigned hybbx_chess_max_games(void);
void hybbx_chess_shutdown(void);

chess_game_t *hybbx_chess_create_game(struct hybbx_session *white,
                                      const char *white_name);
chess_game_t *hybbx_chess_find_open_game(void);
chess_game_t *hybbx_chess_find_game_by_id(const char *id);
chess_game_t *hybbx_chess_get_game(unsigned index);
int           hybbx_chess_join_game(chess_game_t *game,
                                    struct hybbx_session *black,
                                    const char *black_name);
int           hybbx_chess_add_spectator(chess_game_t *game,
                                        struct hybbx_session *spec);
void          hybbx_chess_remove_spectator(chess_game_t *game,
                                           struct hybbx_session *spec);
int           hybbx_chess_is_player(const chess_game_t *game,
                                    const struct hybbx_session *session);
int           hybbx_chess_is_spectator(const chess_game_t *game,
                                       const struct hybbx_session *session);
chess_color_t hybbx_chess_player_color(const chess_game_t *game,
                                       const struct hybbx_session *session);
int           hybbx_chess_make_move(chess_game_t *game,
                                    const char *from, const char *to,
                                    char promote, char *err, size_t errlen);
void          hybbx_chess_render_board(const chess_board_t *board,
                                       struct hybbx_session *session,
                                       const char *label);
void          hybbx_chess_send_board(chess_game_t *game,
                                     struct hybbx_session *session);
void          hybbx_chess_tick(struct hybbx_service *service);
void          hybbx_chess_resign(chess_game_t *game,
                                 struct hybbx_session *who);
void          hybbx_chess_offer_draw(chess_game_t *game,
                                     struct hybbx_session *who);

/* Command handler - called from command.c dispatch */
hybbx_result_t cmd_chess(struct hybbx_service *service,
                        struct hybbx_session *session,
                        const struct hybbx_parsed_command *cmd);

#ifdef __cplusplus
}
#endif

#endif /* HYBBX_CHESS_H */