#ifndef FUNCTIONS_H
#define FUNCTIONS_H

/* vehicle.c */

/* window.c */


/* landscape.c */
void FindLandscapeHeight(TileInfo *ti, uint x, uint y);
void FindLandscapeHeightByTile(TileInfo *ti, uint tile);
uint GetTileSlope(uint tile, int *h);
int GetTileZ(uint tile);

void DoClearSquare(uint tile);
void CDECL ModifyTile(uint tile, uint flags, ...);
void SetMapExtraBits(uint tile, byte flags);
uint GetMapExtraBits(uint tile);
void RunTileLoop();

uint GetPartialZ(int x, int y, int corners);
uint GetSlopeZ(int x, int y);
uint32 GetTileTrackStatus(uint tile, TransportType mode);
void GetAcceptedCargo(uint tile, AcceptedCargo ac);
void ChangeTileOwner(uint tile, byte old_player, byte new_player);
void AnimateTile(uint tile);
void ClickTile(uint tile);
void GetTileDesc(uint tile, TileDesc *td);
void DrawTile(TileInfo *ti);

uint TileAddWrap(TileIndex tile, int addx, int addy);
enum {
	TILE_WRAPPED = (uint)-1
};

bool IsValidTile(uint tile);

static inline Point RemapCoords(int x, int y, int z)
{
#if !defined(NEW_ROTATION)
	Point pt = { (y - x) * 2, y + x - z };
#else
	Point pt = { (x + y) * 2, x - y - z };
#endif
	return pt;
}

static inline Point RemapCoords2(int x, int y)
{
	return RemapCoords(x, y, GetSlopeZ(x, y));
}

/* game.c */
byte *GetString(byte *buffr, uint16 string);
void InjectDparam(int amount);

int32 GetParamInt32();
int GetParamInt16();
int GetParamInt8();
int GetParamUint16();


/* clear_land.c */
void DrawHillyLandTile(TileInfo *ti);
void DrawClearLandTile(TileInfo *ti, byte set);
void DrawClearLandFence(TileInfo *ti, byte img);
void TileLoopClearHelper(uint tile);

/* station_land.c */
void StationPickerDrawSprite(int x, int y, int railtype, int image);

/* track_land.c */
void DrawTrainDepotSprite(int x, int y, int image, int railtype);
void DrawWaypointSprite(int x, int y, int image, int railtype);

/* road_land.c */
void DrawRoadDepotSprite(int x, int y, int image);

/* water_land.c */
void DrawShipDepotSprite(int x, int y, int image);
void TileLoop_Water(uint tile);

/* players.c */
bool CheckPlayerHasMoney(int32 cost);
void SubtractMoneyFromPlayer(int32 cost);
void SubtractMoneyFromPlayerFract(byte player, int32 cost);
bool CheckOwnership(byte owner);
bool CheckTileOwnership(uint tile);
StringID GetPlayerNameString(byte player, byte index);

/* standard */
void ShowInfo(const char *str);
void CDECL ShowInfoF(const char *str, ...);
void NORETURN CDECL error(const char *str, ...);

/* ttd.c */

// **************
// * Warning: DO NOT enable this unless you understand what it does
// *
// * If enabled, in a network game all randoms will be dumped to the
// *  stdout if the first client joins (or if you are a client). This
// *  is to help finding desync problems.
// *
// * Warning: DO NOT enable this unless you understand what it does
// **************

//#define RANDOM_DEBUG

#ifdef RANDOM_DEBUG
	#define Random() DoRandom(__LINE__, __FILE__)
	uint32 DoRandom(uint line, char *file);
	#define RandomRange(max) DoRandomRange(max, __LINE__, __FILE__)
	uint DoRandomRange(uint max, uint line, char *file);
#else
	uint32 Random();
	uint RandomRange(uint max);
#endif

void InitPlayerRandoms();

uint32 InteractiveRandom(); /* Used for random sequences that are not the same on the other end of the multiplayer link */
uint InteractiveRandomRange(uint max);

void SetDate(uint date);
/* facedraw.c */
void DrawPlayerFace(uint32 face, int color, int x, int y);

/* texteff.c */
void MoveAllTextEffects();
void AddTextEffect(StringID msg, int x, int y, uint16 duration);
void InitTextEffects();
void DrawTextEffects(DrawPixelInfo *dpi);

void InitTextMessage();
void DrawTextMessage();
void AddTextMessage(uint16 color, uint8 duration, const char *message, ...);
void UndrawTextMessage();
void TextMessageDailyLoop();

bool AddAnimatedTile(uint tile);
void DeleteAnimatedTile(uint tile);
void AnimateAnimatedTiles();
void InitializeAnimatedTiles();

/* tunnelbridge_cmd.c */
bool CheckTunnelInWay(uint tile, int z);
bool CheckBridge_Stuff(byte bridge_type, int bridge_len);
uint32 GetBridgeLength(TileIndex begin, TileIndex end);
int CalcBridgeLenCostFactor(int x);

typedef void CommandCallback(bool success, uint tile, uint32 p1, uint32 p2);
bool DoCommandP(TileIndex tile, uint32 p1, uint32 p2, CommandCallback *callback, uint32 cmd);

/* network.c */
void NetworkUDPClose(void);
void NetworkStartUp();
void NetworkShutDown(void);
void NetworkGameLoop(void);
void NetworkUDPGameLoop(void);
bool NetworkServerStart(void);
bool NetworkClientConnectGame(const byte* host, unsigned short port);
void NetworkQueryServer(const byte* host, unsigned short port, bool game_info);
void NetworkReboot();
void NetworkDisconnect();
void NetworkSend_Command(uint32 tile, uint32 p1, uint32 p2, uint32 cmd, CommandCallback *callback);

/* misc_cmd.c */
void PlaceTreesRandomly();

uint GetTileDist(TileIndex xy1, TileIndex xy2);
uint GetTileDist1D(TileIndex xy1, TileIndex xy2);
uint GetTileDist1Db(TileIndex xy1, TileIndex xy2);
uint GetTileDistAdv(TileIndex xy1, TileIndex xy2);
bool CheckDistanceFromEdge(TileIndex tile, uint distance);

void InitializeLandscapeVariables(bool only_constants);

/* misc.c */
void DeleteName(StringID id);
byte *GetName(int id, byte *buff);

// AllocateNameUnique also tests if the name used is not used anywere else
//  and if it is used, it returns an error.
#define AllocateNameUnique(name, skip) RealAllocateName(name, skip, true)
#define AllocateName(name, skip) RealAllocateName(name, skip, false)
StringID RealAllocateName(const byte *name, byte skip, bool check_double);
void ConvertDayToYMD(YearMonthDay *ymd, uint16 date);
uint ConvertYMDToDay(uint year, uint month, uint day);
uint ConvertIntDate(uint date);
void CSleep(int milliseconds);


/* misc functions */
void MarkTileDirty(int x, int y);
void MarkTileDirtyByTile(TileIndex tile);
void InvalidateWindow(byte cls, WindowNumber number);
void InvalidateWindowWidget(byte cls, WindowNumber number, byte widget_index);
void InvalidateWindowClasses(byte cls);
void DeleteWindowById(WindowClass cls, WindowNumber number);

void SetObjectToPlaceWnd(int icon, byte mode, Window *w);
void SetObjectToPlace(int icon, byte mode, byte window_class, uint16 window_num);

void ResetObjectToPlace();

bool ScrollWindowToTile(TileIndex tile, Window * w);
bool ScrollWindowTo(int x, int y, Window * w);

bool ScrollMainWindowToTile(TileIndex tile);
bool ScrollMainWindowTo(int x, int y);
void DrawSprite(uint32 img, int x, int y);
bool EnsureNoVehicle(TileIndex tile);
bool EnsureNoVehicleZ(TileIndex tile, byte z);
void MarkAllViewportsDirty(int left, int top, int right, int bottom);
void ShowCostOrIncomeAnimation(int x, int y, int z, int32 cost);
void MarkWholeScreenDirty();

void DrawFoundation(TileInfo *ti, uint f);

bool CheckIfAuthorityAllows(uint tile);
Town *ClosestTownFromTile(uint tile, uint threshold);
void ChangeTownRating(Town *t, int add, int max);

uint GetRoadBitsByTile(TileIndex tile);
int GetTownRadiusGroup(Town *t, uint tile);
int32 GetTransportedGoodsIncome(uint num_pieces, uint dist, byte transit_days, byte cargo_type);
void ShowNetworkChatQueryWindow(byte desttype, byte dest);
void ShowNetworkGiveMoneyWindow(byte player);
void ShowNetworkNeedGamePassword();
void ShowNetworkNeedCompanyPassword();
void ShowRenameSignWindow(SignStruct *ss);
void ShowRenameWaypointWindow(Waypoint *cp);
int FindFirstBit(uint32 x);
void ShowHighscoreTable(int tbl);
TileIndex AdjustTileCoordRandomly(TileIndex a, byte rng);

enum SaveOrLoadResult {
	SL_OK = 0, // completed successfully
	SL_ERROR = 1, // error that was caught before internal structures were modified
	SL_REINIT = 2, // error that was caught in the middle of updating game state, need to clear it. (can only happen during load)
};
enum SaveOrLoadMode {
	SL_INVALID = -1,
	SL_LOAD = 0,
	SL_SAVE = 1,
	SL_OLD_LOAD = 2,
};

int SaveOrLoad(const char *filename, int mode);

void AfterLoadTown();
void AskExitGame();
void AskExitToGameMenu();

void RedrawAutosave();

StringID RemapOldStringID(StringID s);

void UpdateViewportSignPos(ViewportSign *sign, int left, int top, StringID str);

enum {
	SLD_LOAD_GAME = 0,
	SLD_LOAD_SCENARIO = 1,
	SLD_SAVE_GAME = 2,
	SLD_SAVE_SCENARIO = 3,
	SLD_NEW_GAME = 4,
};
void ShowSaveLoadDialog(int mode);

void ttd_strlcpy(char *dst, const char *src, size_t len);

// callback from drivers that is called if the game size changes dynamically
void GameSizeChanged();
bool FileExists(const char *filename);
bool ReadLanguagePack(int index);
void InitializeLanguagePacks();
byte *ReadFileToMem(const char *filename, size_t *lenp, size_t maxsize);
int GetLanguageList(char **languages, int max);

void CheckSwitchToEuro();

void LoadFromConfig();
void SaveToConfig();
int ttd_main(int argc, char* argv[]);
byte GetOSVersion();

void DeterminePaths();
char * CDECL str_fmt(const char *str, ...);

#endif /* FUNCTIONS_H */