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/* $Id$ */

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/** @file road.h */

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#ifndef ROAD_H

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#define ROAD_H

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#include "helpers.hpp"

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enum RoadBits {

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	ROAD_NONE = 0U,

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	ROAD_NW  = 1U,

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	ROAD_SW  = 2U,

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	ROAD_SE  = 4U,

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	ROAD_NE  = 8U,

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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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};

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DECLARE_ENUM_AS_BIT_SET(RoadBits);

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static inline RoadBits ComplementRoadBits(RoadBits r)

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{

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	return (RoadBits)(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 (RoadBits)(1U << (3 ^ d));

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}

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/** Checks whether the trackdir means that we are reversing */

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static inline bool IsReversingRoadTrackdir(Trackdir dir)

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{

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	return (dir & 0x07) >= 6;

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}

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/** Checks whether the given trackdir is a straight road */

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static inline bool IsStraightRoadTrackdir(Trackdir dir)

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{

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	return (dir & 0x06) == 0;

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}

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/**

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 * Is it allowed to remove the given road bits from the given tile?

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 * @param tile      the tile to remove the road from

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 * @param remove    the roadbits that are going to be removed

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 * @param owner     the actual owner of the roadbits of the tile

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 * @param edge_road are the removed bits from a town?

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 * @return true when it is allowed to remove the road bits

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 */

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bool CheckAllowRemoveRoad(TileIndex tile, RoadBits remove, Owner owner, bool *edge_road);

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#endif /* ROAD_H */