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#ifndef HAL_H

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#define HAL_H

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typedef struct {

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	char *(*start)(char **parm);

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} HalCommonDriver;

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typedef struct {

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	const char *(*start)(char **parm);

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	void (*make_dirty)(int left, int top, int width, int height);

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	bool (*change_resolution)(int w, int h);

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} HalVideoDriver;

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enum {

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	ML_QUIT = 0,

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	ML_SWITCHDRIVER = 1,

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};

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typedef struct {

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	char *(*start)(char **parm);

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} HalSoundDriver;

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typedef struct {

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	char *(*start)(char **parm);

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	void (*play_song)(const char *filename);

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	void (*set_volume)(byte vol);

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} HalMusicDriver;

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typedef struct {

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	const char *name;

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	const char *longname;

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	const void *drv;

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	uint32 flags;

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} DriverDesc;

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enum {

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	HALERR_OK = 0,

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	HALERR_ERROR = 1,

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};

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extern const HalMusicDriver _null_music_driver;

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extern const HalVideoDriver _null_video_driver;

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extern const HalSoundDriver _null_sound_driver;

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VARDEF HalMusicDriver *_music_driver;

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VARDEF HalSoundDriver *_sound_driver;

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VARDEF HalVideoDriver *_video_driver;

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extern const DriverDesc _video_driver_descs[];

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extern const DriverDesc _sound_driver_descs[];

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extern const DriverDesc _music_driver_descs[];

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#if defined(WITH_SDL)

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extern const HalSoundDriver _sdl_sound_driver;

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extern const HalVideoDriver _sdl_video_driver;

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#endif

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#if defined(UNIX)

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extern const HalMusicDriver _extmidi_music_driver;

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#endif

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#if defined(__BEOS__)

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extern const HalMusicDriver _bemidi_music_driver;

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#endif

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#if defined(__OS2__)

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extern const HalMusicDriver _os2_music_driver;

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#endif

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extern const HalVideoDriver _dedicated_video_driver;

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enum DriverType {

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	VIDEO_DRIVER = 0,

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	SOUND_DRIVER = 1,

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	MUSIC_DRIVER = 2,

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};

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extern bool _dbg_screen_rect;

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void LoadDriver(int driver, const char *name);

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char *GetDriverParam(char **parm, const char *name);

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bool GetDriverParamBool(char **parm, const char *name);

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int GetDriverParamInt(char **parm, const char *name, int def);

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// Deals with finding savegames

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typedef struct {

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	uint16 id;

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	byte type;

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	uint64 mtime;

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	char title[64];

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	char name[256-12-64];

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	int old_extension;

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} FiosItem;

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// extensions of old savegames, scenarios

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static const char* const _old_extensions[] = {

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	// old savegame types

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	"ss1", // Transport Tycoon Deluxe preset game

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	"sv1", // Transport Tycoon Deluxe (Patch) saved game

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	"sv2", // Transport Tycoon Deluxe (Patch) saved 2-player game

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	// old scenario game type

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	"sv0", // Transport Tycoon Deluxe (Patch) scenario

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	"ss0", // Transport Tycoon Deluxe preset scenario

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};

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enum {

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	FIOS_TYPE_DRIVE = 0,

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	FIOS_TYPE_PARENT = 1,

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	FIOS_TYPE_DIR = 2,

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	FIOS_TYPE_FILE = 3,

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	FIOS_TYPE_OLDFILE = 4,

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	FIOS_TYPE_SCENARIO = 5,

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	FIOS_TYPE_OLD_SCENARIO = 6,

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};

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// Variables to display file lists

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FiosItem *_fios_list;

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int _fios_num;

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int _saveload_mode;

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// get the name of an oldstyle savegame

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void GetOldSaveGameName(char *title, const char *file);

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// get the name of an oldstyle scenario

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void GetOldScenarioGameName(char *title, const char *file);

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// Get a list of savegames

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FiosItem *FiosGetSavegameList(int *num, int mode);

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// Get a list of scenarios

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FiosItem *FiosGetScenarioList(int *num, int mode);

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// Free the list of savegames

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// Browse to. Returns a filename w/path if we reached a file.

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char *FiosBrowseTo(const FiosItem *item);

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// Get descriptive texts.

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// Returns a path as well as a

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//  string describing the path.

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StringID FiosGetDescText(const char **path);

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// Delete a name

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void FiosDelete(const char *name);

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// Make a filename from a name

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void FiosMakeSavegameName(char *buf, const char *name);

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#endif /* HAL_H */