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/* $Id$ */

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/** @file functions.h */

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#ifndef FUNCTIONS_H

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#define FUNCTIONS_H

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#include "gfx.h"

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void UpdateTownMaxPass(Town *t);

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/* clear_land.cpp */

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void DrawHillyLandTile(const TileInfo *ti);

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void DrawClearLandTile(const TileInfo *ti, byte set);

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void DrawClearLandFence(const TileInfo *ti);

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void TileLoopClearHelper(TileIndex tile);

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/* water_land.cpp */

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void DrawShipDepotSprite(int x, int y, int image);

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void TileLoop_Water(TileIndex tile);

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/* players.cpp */

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bool CheckPlayerHasMoney(CommandCost cost);

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void SubtractMoneyFromPlayer(CommandCost cost);

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void SubtractMoneyFromPlayerFract(PlayerID player, CommandCost cost);

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bool CheckOwnership(Owner owner);

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bool CheckTileOwnership(TileIndex tile);

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/* standard */

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void ShowInfo(const char *str);

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void CDECL ShowInfoF(const char *str, ...);

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/* openttd.cpp */

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/**************

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 * Warning: DO NOT enable this unless you understand what it does

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 *

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 * If enabled, in a network game all randoms will be dumped to the

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 *  stdout if the first client joins (or if you are a client). This

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 *  is to help finding desync problems.

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 *

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 * Warning: DO NOT enable this unless you understand what it does

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 **************/

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//#define RANDOM_DEBUG

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// Enable this to produce higher quality random numbers.

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// Doesn't work with network yet.

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//#define MERSENNE_TWISTER

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// Mersenne twister functions

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void SeedMT(uint32 seed);

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uint32 RandomMT();

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#ifdef MERSENNE_TWISTER

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	static inline uint32 Random() { return RandomMT(); }

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	uint RandomRange(uint max);

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#else

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#ifdef RANDOM_DEBUG

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	#define Random() DoRandom(__LINE__, __FILE__)

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	uint32 DoRandom(int line, const char *file);

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	#define RandomRange(max) DoRandomRange(max, __LINE__, __FILE__)

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	uint DoRandomRange(uint max, int line, const char *file);

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#else

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	uint32 Random();

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	uint RandomRange(uint max);

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#endif

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#endif // MERSENNE_TWISTER

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static inline TileIndex RandomTileSeed(uint32 r) { return TILE_MASK(r); }

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static inline TileIndex RandomTile() { return TILE_MASK(Random()); }

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

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uint InteractiveRandomRange(uint max);

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/* texteff.cpp */

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void DeleteAnimatedTile(TileIndex tile);

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void AnimateAnimatedTiles();

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void InitializeAnimatedTiles();

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/* tunnelbridge_cmd.cpp */

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bool CheckBridge_Stuff(byte bridge_type, uint bridge_len);

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uint32 GetBridgeLength(TileIndex begin, TileIndex end);

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int CalcBridgeLenCostFactor(int x);

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/* misc_cmd.cpp */

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void PlaceTreesRandomly();

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void InitializeLandscapeVariables(bool only_constants);

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/* misc.cpp */

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bool IsCustomName(StringID id);

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void DeleteName(StringID id);

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char *GetName(char *buff, StringID id, const char *last);

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#define AllocateName(name, skip) RealAllocateName(name, skip, false)

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StringID RealAllocateName(const char *name, byte skip, bool check_double);

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void ConvertNameArray();

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/* misc functions */

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/**

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 * Mark a tile given by its coordinate dirty for repaint.

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 *

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 * @ingroup dirty

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 */

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void MarkTileDirty(int x, int y);

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/**

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 * Mark a tile given by its index dirty for repaint.

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 *

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 * @ingroup dirty

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 */

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void MarkTileDirtyByTile(TileIndex tile);

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void InvalidateWindow(WindowClass cls, WindowNumber number);

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void InvalidateWindowWidget(WindowClass cls, WindowNumber number, byte widget_index);

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void InvalidateWindowClasses(WindowClass cls);

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void InvalidateWindowClassesData(WindowClass cls);

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void DeleteWindowById(WindowClass cls, WindowNumber number);

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void DeleteWindowByClass(WindowClass cls);

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void SetObjectToPlaceWnd(CursorID icon, SpriteID pal, byte mode, Window *w);

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void SetObjectToPlace(CursorID icon, SpriteID pal, byte mode, WindowClass window_class, WindowNumber window_num);

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void ResetObjectToPlace();

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bool ScrollWindowTo(int x, int y, Window *w, bool instant = false);

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bool ScrollMainWindowToTile(TileIndex tile, bool instant = false);

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bool ScrollMainWindowTo(int x, int y, bool instant = false);

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bool EnsureNoVehicleOnGround(TileIndex tile);

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/**

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 * Mark all viewports dirty for repaint.

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 *

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 * @ingroup dirty

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 */

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void MarkAllViewportsDirty(int left, int top, int right, int bottom);

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void ShowCostOrIncomeAnimation(int x, int y, int z, Money cost);

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void ShowFeederIncomeAnimation(int x, int y, int z, Money cost);

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bool CheckIfAuthorityAllows(TileIndex tile);

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Town *ClosestTownFromTile(TileIndex tile, uint threshold);

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void ChangeTownRating(Town *t, int add, int max);

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uint GetTownRadiusGroup(const Town* t, TileIndex tile);

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void ShowHighscoreTable(int difficulty, int8 rank);

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int FindFirstBit(uint32 x);

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void AfterLoadTown();

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void UpdatePatches();

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void AskExitGame();

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void AskExitToGameMenu();

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void RedrawAutosave();

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StringID RemapOldStringID(StringID s);

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

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enum {

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	SLD_LOAD_GAME,

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	SLD_LOAD_SCENARIO,

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	SLD_SAVE_GAME,

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	SLD_SAVE_SCENARIO,

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	SLD_LOAD_HEIGHTMAP,

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	SLD_NEW_GAME,

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};

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void ShowSaveLoadDialog(int mode);

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/* callback from drivers that is called if the game size changes dynamically */

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void GameSizeChanged();

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bool FileExists(const char *filename);

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const char *GetCurrentLocale(const char *param);

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void *ReadFileToMem(const char *filename, size_t *lenp, size_t maxsize);

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void LoadFromConfig();

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void SaveToConfig();

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void CheckConfig();

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int ttd_main(int argc, char* argv[]);

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void HandleExitGameRequest();

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#endif /* FUNCTIONS_H */