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/* $Id$ */

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#ifndef ROAD_MAP_H

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#define ROAD_MAP_H

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#include "macros.h"

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#include "rail.h"

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#include "tile.h"

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typedef enum RoadBits {

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	ROAD_NW  = 1,

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	ROAD_SW  = 2,

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	ROAD_SE  = 4,

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	ROAD_NE  = 8,

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	ROAD_X   = ROAD_SW | ROAD_NE,

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	ROAD_Y   = ROAD_NW | ROAD_SE,

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	ROAD_ALL = ROAD_X  | ROAD_Y

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} RoadBits;

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static inline RoadBits ComplementRoadBits(RoadBits r)

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{

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	return ROAD_ALL ^ r;

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}

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static inline RoadBits DiagDirToRoadBits(DiagDirection d)

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{

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	return 1 << (3 ^ d);

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}

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typedef enum RoadType {

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	ROAD_NORMAL,

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	ROAD_CROSSING,

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	ROAD_DEPOT

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} RoadType;

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static inline RoadType GetRoadType(TileIndex t)

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{

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	assert(IsTileType(t, MP_STREET));

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	return GB(_m[t].m5, 4, 4);

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}

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static inline bool IsLevelCrossing(TileIndex t)

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{

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	return GetRoadType(t) == ROAD_CROSSING;

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}

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static inline RoadBits GetRoadBits(TileIndex t)

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{

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	assert(GetRoadType(t) == ROAD_NORMAL);

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	return GB(_m[t].m5, 0, 4);

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}

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static inline void SetRoadBits(TileIndex t, RoadBits r)

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{

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	assert(GetRoadType(t) == ROAD_NORMAL); // XXX incomplete

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	SB(_m[t].m5, 0, 4, r);

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}

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static inline Axis GetCrossingRoadAxis(TileIndex t)

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{

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	assert(GetRoadType(t) == ROAD_CROSSING);

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	return (Axis)GB(_m[t].m5, 3, 1);

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}

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static inline RoadBits GetCrossingRoadBits(TileIndex tile)

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{

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	return GetCrossingRoadAxis(tile) == AXIS_X ? ROAD_X : ROAD_Y;

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}

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static inline TrackBits GetCrossingRailBits(TileIndex tile)

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{

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	return GetCrossingRoadAxis(tile) == AXIS_X ? TRACK_BIT_Y : TRACK_BIT_X;

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}

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// TODO swap owner of road and rail

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static inline Owner GetCrossingRoadOwner(TileIndex t)

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{

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	assert(GetRoadType(t) == ROAD_CROSSING);

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	return (Owner)_m[t].m3;

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}

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static inline void SetCrossingRoadOwner(TileIndex t, Owner o)

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{

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	assert(GetRoadType(t) == ROAD_CROSSING);

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	_m[t].m3 = o;

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}

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static inline void UnbarCrossing(TileIndex t)

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{

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	assert(GetRoadType(t) == ROAD_CROSSING);

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	CLRBIT(_m[t].m5, 2);

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}

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static inline void BarCrossing(TileIndex t)

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{

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	assert(GetRoadType(t) == ROAD_CROSSING);

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	SETBIT(_m[t].m5, 2);

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}

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static inline bool IsCrossingBarred(TileIndex t)

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{

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	assert(GetRoadType(t) == ROAD_CROSSING);

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	return HASBIT(_m[t].m5, 2);

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}

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#define IsOnDesert IsOnSnow

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static inline bool IsOnSnow(TileIndex t)

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{

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	return HASBIT(_m[t].m4, 7);

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}

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#define ToggleDesert ToggleSnow

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static inline void ToggleSnow(TileIndex t)

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{

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	TOGGLEBIT(_m[t].m4, 7);

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}

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typedef enum RoadGroundType {

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	RGT_BARREN,

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	RGT_GRASS,

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	RGT_PAVED,

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	RGT_LIGHT,

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	RGT_NOT_IN_USE, /* Has something to do with fund buildings */

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	RGT_ALLEY,

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	RGT_ROADWORK_GRASS,

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	RGT_ROADWORK_PAVED,

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	RGT_ROADWORK_OFFSET = RGT_ROADWORK_GRASS - RGT_GRASS

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} RoadGroundType;

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static inline RoadGroundType GetGroundType(TileIndex t)

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{

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	return (RoadGroundType)GB(_m[t].m4, 4, 3);

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}

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static inline void SetGroundType(TileIndex t, RoadGroundType rgt)

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{

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	SB(_m[t].m4, 4, 3, rgt);

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}

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static inline bool HasRoadWorks(TileIndex t)

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{

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	return GetGroundType(t) >= RGT_ROADWORK_GRASS;

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}

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static inline bool IncreaseRoadWorksCounter(TileIndex t)

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{

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	AB(_m[t].m4, 0, 4, 1);

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	return GB(_m[t].m4, 0, 4) == 15;

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}

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static inline void StartRoadWorks(TileIndex t)

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{

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	assert(!HasRoadWorks(t));

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	/* Remove any trees or lamps in case or roadwork */

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	SetGroundType(t, min(GetGroundType(t), RGT_PAVED) + RGT_ROADWORK_OFFSET);

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}

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static inline void TerminateRoadWorks(TileIndex t)

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{

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	assert(HasRoadWorks(t));

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	SetGroundType(t, GetGroundType(t) - RGT_ROADWORK_OFFSET);

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	/* Stop the counter */

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	SB(_m[t].m4, 0, 4, 0);

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}

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static inline bool HasPavement(TileIndex t)

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{

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	return GetGroundType(t) >= RGT_PAVED && GetGroundType(t) != RGT_ROADWORK_GRASS;

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}

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static inline DiagDirection GetRoadDepotDirection(TileIndex t)

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{

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	assert(GetRoadType(t) == ROAD_DEPOT);

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	return (DiagDirection)GB(_m[t].m5, 0, 2);

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}

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/**

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 * Returns the RoadBits on an arbitrary tile

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 * Special behavior:

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 * - road depots: entrance is treated as road piece

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 * - road tunnels: entrance is treated as road piece

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 * - bridge ramps: start of the ramp is treated as road piece

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 * - bridge middle parts: bridge itself is ignored

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 */

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RoadBits GetAnyRoadBits(TileIndex);

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TrackBits GetAnyRoadTrackBits(TileIndex tile);

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static inline void MakeRoadNormal(TileIndex t, Owner owner, RoadBits bits, uint town)

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{

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	SetTileType(t, MP_STREET);

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	SetTileOwner(t, owner);

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	_m[t].m2 = town;

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	_m[t].m3 = 0;

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	_m[t].m4 = 0 << 7 | 0 << 4 | 0;

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	_m[t].m5 = ROAD_NORMAL << 4 | bits;

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}

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static inline void MakeRoadCrossing(TileIndex t, Owner road, Owner rail, Axis roaddir, RailType rt, uint town)

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{

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	SetTileType(t, MP_STREET);

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	SetTileOwner(t, rail);

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	_m[t].m2 = town;

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	_m[t].m3 = road;

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	_m[t].m4 = 0 << 7 | 0 << 4 | rt;

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	_m[t].m5 = ROAD_CROSSING << 4 | roaddir << 3 | 0 << 2;

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}

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static inline void MakeRoadDepot(TileIndex t, Owner owner, DiagDirection dir)

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{

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	SetTileType(t, MP_STREET);

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	SetTileOwner(t, owner);

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	_m[t].m2 = 0;

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	_m[t].m3 = 0;

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	_m[t].m4 = 0;

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	_m[t].m5 = ROAD_DEPOT << 4 | dir;

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}

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#endif