/*
 * Entertain plugin — chess.h (internal)
 * Chess game engine for HyBBX Entertain area.
 */
#ifndef ENTERTAIN_CHESS_H
#define ENTERTAIN_CHESS_H

#include "hybbx/types.h"

struct hybbx_session;
struct hybbx_service;

#define CHESS_BOARD_SIZE    8
#define CHESS_GAME_MAX      16
#define CHESS_SPECTATOR_MAX 32
#define CHESS_REFRESH_SEC   15
#define CHESS_DEFAULT_MAX   8
#define CHESS_NAME_MAX      32
#define CHESS_SAN_MAX       8
#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[CHESS_NAME_MAX];
    char                black_name[CHESS_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;

/* Lifecycle */
void chess_init(unsigned max_games);
void chess_shutdown(void);
unsigned chess_max_games(void);

/* Game management */
chess_game_t *chess_create_game(struct hybbx_session *white, const char *name);
chess_game_t *chess_find_open_game(void);
chess_game_t *chess_find_game_by_id(const char *id);
chess_game_t *chess_get_game(unsigned index);
int  chess_join_game(chess_game_t *g, struct hybbx_session *black, const char *name);
int  chess_add_spectator(chess_game_t *g, struct hybbx_session *spec);
void chess_remove_spectator(chess_game_t *g, struct hybbx_session *spec);
int  chess_is_player(const chess_game_t *g, const struct hybbx_session *s);
int  chess_is_spectator(const chess_game_t *g, const struct hybbx_session *s);
chess_color_t chess_player_color(const chess_game_t *g, const struct hybbx_session *s);

/* Session slot (for future use) */
unsigned chess_session_slot(const struct hybbx_session *s);
void chess_session_set_slot(struct hybbx_session *s, unsigned slot);

/* Moves + display */
int  chess_make_move(chess_game_t *g, const char *from, const char *to,
                     char promote, char *err, size_t errlen);
void chess_send_board(chess_game_t *g, struct hybbx_session *s);
void chess_resign(chess_game_t *g, struct hybbx_session *who);
void chess_offer_draw(chess_game_t *g, struct hybbx_session *who);

/* Tick — call from plugin tick every 1s */
void chess_tick(struct hybbx_service *service);

#endif /* ENTERTAIN_CHESS_H */