/* ScummVM - Scumm Interpreter
 * Copyright (C) 2006 The ScummVM project
 *
 * Copyright (C) 1999-2001 Sarien Team
 *
 * 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.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL$
 * $Id$
 *
 */

#ifndef __AGI_H
#define __AGI_H

#include "common/stdafx.h"
#include "common/scummsys.h"
#include "common/endian.h"
#include "common/util.h"
#include "common/file.h"
#include "common/savefile.h"
#include "common/system.h"

#include "base/engine.h"

namespace Agi {

typedef signed int Err;

/*
 * Version and other definitions
 */
#define INLINE __inline
#define VERSION __DATE__ " " __TIME__

/* Default features -- can be overriden in portdefs.h */
#define USE_CONSOLE
#define USE_PCM_SOUND
#define USE_IIGS_SOUND
#define USE_HIRES
#define AGDS_SUPPORT

#define	TITLE		"AGI engine"

#define DIR_		"dir"
#define LOGDIR		"logdir"
#define PICDIR		"picdir"
#define VIEWDIR		"viewdir"
#define	SNDDIR		"snddir"
#define OBJECTS		"object"
#define WORDS		"words.tok"

#define	MAX_DIRS	256
#define	MAX_VARS	256
#define	MAX_FLAGS	(256 >> 3)
#define MAX_VIEWTABLE	255	/* KQ3 uses o255! */
#define MAX_WORDS	20
#define	MAX_STRINGS	24	/* MAX_STRINGS + 1 used for get.num */
#define MAX_STRINGLEN	40
#ifndef MAX_PATH
#define MAX_PATH	260
#endif

#define	_EMPTY		0xfffff
#define	EGO_OWNED	0xff

#define	CRYPT_KEY_SIERRA	"Avis Durgan"
#define CRYPT_KEY_AGDS		"Alex Simkin"

#ifndef INLINE
#define INLINE
#endif

#ifndef USE_PCM_SOUND
#undef USE_IIGS_SOUND
#endif

#define	MSG_BOX_COLOUR	0x0f	/* White */
#define MSG_BOX_TEXT	0x00	/* Black */
#define MSG_BOX_LINE	0x04	/* Red */
#define STATUS_FG	0x00	/* Black */
#define	STATUS_BG	0x0f	/* White */
#define PATCH_LOGIC		/* disable copy protection on some games */

}                             // End of namespace Agi

/* AGI resources */
#include "agi/console.h"
#include "agi/view.h"
#include "agi/picture.h"
#include "agi/logic.h"
#include "agi/sound.h"

namespace Agi {

int getflag(int);
void setflag(int, int);
void flipflag(int);
int getvar(int);
void setvar(int, int);
void decrypt(uint8 * mem, int len);
void release_sprites(void);
int main_cycle(void);
int view_pictures(void);
int parse_cli(int, char **);
int run_game(void);
int init_machine(void);
int deinit_machine(void);
int get_direction(int x, int y, int x0, int y0, int s);
void inventory(void);
void list_games(void);
uint32 match_crc(uint32, char *, int);
int v2id_game(void);
int v3id_game(void);
int v4id_game(uint32 ver);
void update_timer(void);
int get_app_dir(char *app_dir, unsigned int size);

enum {
	NO_GAMEDIR = 0,
	GAMEDIR
};

enum AGIErrors {
	err_OK = 0,
	err_DoNothing,
	err_BadCLISwitch,
	err_InvalidAGIFile,
	err_BadFileOpen,
	err_NotEnoughMemory,
	err_BadResource,
	err_UnknownAGIVersion,
	err_RestartGame,
	err_NoLoopsInView,
	err_ViewDataError,
	err_NoGameList,

	err_Unk = 127
};

enum kDebugLevels {
	kDebugLevelMain =      1 << 0,
	kDebugLevelResources = 1 << 1,
	kDebugLevelSprites =   1 << 2,
	kDebugLevelInventory = 1 << 3,
	kDebugLevelInput =     1 << 4,
	kDebugLevelMenu =      1 << 5,
	kDebugLevelScripts =   1 << 6,
	kDebugLevelSound =     1 << 7,
	kDebugLevelText =      1 << 8
};

/**
 * AGI resources.
 */
enum {
	rLOGIC = 1,
	rSOUND,
	rVIEW,
	rPICTURE
};

enum {
	RES_LOADED = 1,
	RES_COMPRESSED = 0x40
};

enum {
	lCOMMAND_MODE = 1,
	lTEST_MODE
};

struct game_id_list {
	struct game_id_list *next;
	uint32 version;
	uint32 crc;
	char *gName;
	char *switches;
};

struct mouse {
	int button;
	unsigned int x;
	unsigned int y;
};

/**
 * Command-line options.
 */
struct agi_options {
#define GAMERUN_RUNGAME 0
#define GAMERUN_PICVIEW 1
#define GAMERUN_WORDS	2
#define GAMERUN_OBJECTS	3
#define GAMERUN_GAMES	4
#define GAMERUN_CRC	5
	int gamerun;		/**< game run mode*/
	int emuversion;		/**< AGI version to emulate */
	int agds;		/**< enable AGDS mode */
	int amiga;		/**< enable Amiga mode */
	int fullscreen;		/**< use full screen mode if available */
	int nosound;		/**< disable sound */
	int egapal;		/**< use PC EGA palette */
	int cgaemu;		/**< use PC CGA emulation */
#ifdef USE_HIRES
	int hires;		/**< use hi-res pictures */
#endif
	int soundemu;		/**< sound emulation mode */
	int agimouse;		/**< AGI Mouse 1.0 emulation */
};

extern struct agi_options opt;
extern uint8 *exec_name;

extern volatile uint32 clock_ticks;
extern volatile uint32 clock_count;
extern volatile uint32 msg_box_secs2;

#ifdef USE_CONSOLE
extern struct agi_debug debug_;
#endif

extern struct mouse mouse;

int console_keyhandler(int);
int console_init(void);
void console_cycle(void);
void console_lock(void);
void console_prompt(void);
#define report printf

enum GameId {
	GID_AGI = 1
};

extern Common::RandomSource * rnd;
extern const char *_savePath;

class AgiEngine:public::Engine {
	int _gameId;

	void errorString(const char *buf_input, char *buf_output);

protected:
	int init();
	int go();
	void shutdown();
	void initialize();


public:
	AgiEngine(OSystem * syst);
	virtual ~ AgiEngine();
	int getGameId() {
		return _gameId;
}};

#define WIN_TO_PIC_X(x) ((x) / 2)
#define WIN_TO_PIC_Y(y) ((y) < 8 ? 999 : (y) >= (8 + _HEIGHT) ? 999 : (y) - 8)

/**
 * AGI variables.
 */
enum {
	V_cur_room = 0,		/* 0 */
	V_prev_room,
	V_border_touch_ego,
	V_score,
	V_border_code,
	V_border_touch_obj,	/* 5 */
	V_ego_dir,
	V_max_score,
	V_free_pages,
	V_word_not_found,
	V_time_delay,		/* 10 */
	V_seconds,
	V_minutes,
	V_hours,
	V_days,
	V_joystick_sensitivity,	/* 15 */
	V_ego_view_resource,
	V_agi_err_code,
	V_agi_err_code_info,
	V_key,
	V_computer,		/* 20 */
	V_window_reset,
	V_soundgen,
	V_volume,
	V_max_input_chars,
	V_sel_item,		/* 25 */
	V_monitor
};

/**
 * AGI flags
 */
enum {
	F_ego_water = 0,	/* 0 */
	F_ego_invisible,
	F_entered_cli,
	F_ego_touched_p2,
	F_said_accepted_input,
	F_new_room_exec,	/* 5 */
	F_restart_game,
	F_script_blocked,
	F_joy_sensitivity,
	F_sound_on,
	F_debugger_on,		/* 10 */
	F_logic_zero_firsttime,
	F_restore_just_ran,
	F_status_selects_items,
	F_menus_work,
	F_output_mode,		/* 15 */
	F_auto_restart
};

struct agi_event {
	uint16 data;
	uint8 occured;
};

struct agi_object {
	int location;
	char *name;
};

struct agi_word {
	int id;
	char *word;
};

struct agi_dir {
	uint8 volume;
	uint32 offset;
	uint32 len;
	uint32 clen;
	uint8 flags;
	/* 0 = not in mem, can be freed
	 * 1 = in mem, can be released
	 * 2 = not in mem, cant be released
	 * 3 = in mem, cant be released
	 * 0x40 = was compressed
	 */
};

struct agi_block {
	int active;
	int x1, y1;
	int x2, y2;
	uint8 *buffer;		/* used for window background */
};

#define EGO_VIEW_TABLE	0
#define	HORIZON		36
#define _WIDTH		160
#define _HEIGHT		168

/**
 * AGI game structure.
 * This structure contains all global data of an AGI game executed
 * by the interpreter.
 */
struct agi_game {
#define STATE_INIT	0x00
#define STATE_LOADED	0x01
#define STATE_RUNNING	0x02
	int state;		/**< state of the interpreter */

	char name[8];		/**< lead in id (e.g. `GR' for goldrush) */
	char id[8];		/**< game id */
	uint32 crc;		/**< game CRC */

	/* game flags and variables */
	uint8 flags[MAX_FLAGS];
				/**< 256 1-bit flags */
	uint8 vars[MAX_VARS];
				/**< 256 variables */

	/* internal variables */
	int horizon;		/**< horizon y coordinate */
	int line_status;	/**< line number to put status on */
	int line_user_input;
				/**< line to put user input on */
	int line_min_print;
				/**< num lines to print on */
	int cursor_pos;		/**< column where the input cursor is */
	uint8 input_buffer[40];
				/**< buffer for user input */
	uint8 echo_buffer[40];
				/**< buffer for echo.line */
	int keypress;
#define INPUT_NORMAL	0x01
#define INPUT_GETSTRING	0x02
#define INPUT_MENU	0x03
#define INPUT_NONE	0x04
	int input_mode;		/**< keyboard input mode */
	int input_enabled;
				/**< keyboard input enabled */
	int lognum;		/**< current logic number */

	/* internal flags */
	int player_control;
				/**< player is in control */
	int quit_prog_now;
				/**< quit now */
	int status_line;	/**< status line on/off */
	int clock_enabled;
				/**< clock is on/off */
	int exit_all_logics;
				/**< break cycle after new.room */
	int picture_shown;
				/**< show.pic has been issued */
	int has_prompt;		/**< input prompt has been printed */
#define ID_AGDS		0x00000001
#define ID_AMIGA	0x00000002
	int game_flags;		/**< agi options flags */

	uint8 pri_table[_HEIGHT];
					/**< priority table */

	/* windows */
	uint32 msg_box_ticks;
				/**< timed message box tick counter */
	struct agi_block block;
	struct agi_block window;
	int has_window;

	/* graphics & text */
	int gfx_mode;
	char cursor_char;
	unsigned int color_fg;
	unsigned int color_bg;
	uint8 *sbuf;			/**< 160x168 AGI screen buffer */
#ifdef USE_HIRES
	uint8 *hires;			/**< 320x168 hi-res buffer */
#endif

	/* player command line */
	struct agi_word ego_words[MAX_WORDS];
	int num_ego_words;

	unsigned int num_objects;

	struct agi_event ev_keyp[MAX_DIRS];
						/**< keyboard keypress events */
	char strings[MAX_STRINGS + 1][MAX_STRINGLEN];
							/**< strings */

	/* directory entries for resources */
	struct agi_dir dir_logic[MAX_DIRS];
	struct agi_dir dir_pic[MAX_DIRS];
	struct agi_dir dir_view[MAX_DIRS];
	struct agi_dir dir_sound[MAX_DIRS];

	/* resources */
	struct agi_picture pictures[MAX_DIRS];
						/**< AGI picture resources */
	struct agi_logic logics[MAX_DIRS];
						/**< AGI logic resources */
	struct agi_view views[MAX_DIRS];	/**< AGI view resources */
	struct agi_sound sounds[MAX_DIRS];
						/**< AGI sound resources */

	/* view table */
	struct vt_entry view_table[MAX_VIEWTABLE];

	int32 ver;				/**< detected game version */

	int simple_save;			/**< select simple savegames */
};

/**
 *
 */
struct agi_loader {
	int version;
	int int_version;
	int (*init) (void);
	int (*deinit) (void);
	int (*detect_game) ();
	int (*load_resource) (int, int);
	int (*unload_resource) (int, int);
	int (*load_objects) (char *);
	int (*load_words) (char *);
};

extern struct agi_game game;

int agi_init(void);
int agi_deinit(void);
int agi_version(void);
int agi_get_release(void);
void agi_set_release(int);
int agi_detect_game();
int agi_load_resource(int, int);
int agi_unload_resource(int, int);
void agi_unload_resources(void);

/* words */
int show_words(void);
int load_words(char *);
void unload_words(void);
int find_word(char *word, int *flen);
void dictionary_words(char *);

/* objects */
int show_objects(void);
int load_objects(char *fname);
int alloc_objects(int);
void unload_objects(void);
char *object_name(unsigned int);
int object_get_location(unsigned int);
void object_set_location(unsigned int, int);

void new_input_mode(int);
void old_input_mode(void);

int run_logic(int);

void agi_timer_low();
int agi_get_keypress_low();
int agi_is_keypress_low();

}                             // End of namespace Agi

#endif				/* __AGI_H */