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/* $Id$ */

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/** @file road_map.cpp */

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#include "stdafx.h"

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#include "openttd.h"

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#include "bridge_map.h"

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#include "functions.h"

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#include "landscape.h"

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#include "road_map.h"

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#include "station.h"

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#include "tunnel_map.h"

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#include "station_map.h"

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#include "depot.h"

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RoadBits GetAnyRoadBits(TileIndex tile, RoadType rt)

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{

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	if (!HASBIT(GetRoadTypes(tile), rt)) return ROAD_NONE;

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	switch (GetTileType(tile)) {

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		case MP_STREET:

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			switch (GetRoadTileType(tile)) {

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				default:

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				case ROAD_TILE_NORMAL:   return GetRoadBits(tile, rt);

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				case ROAD_TILE_CROSSING: return GetCrossingRoadBits(tile);

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				case ROAD_TILE_DEPOT:    return DiagDirToRoadBits(GetRoadDepotDirection(tile));

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			}

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		case MP_STATION:

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			if (!IsRoadStopTile(tile)) return ROAD_NONE;

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			if (IsDriveThroughStopTile(tile)) return (GetRoadStopDir(tile) == DIAGDIR_NE) ? ROAD_X : ROAD_Y;

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			return DiagDirToRoadBits(GetRoadStopDir(tile));

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		case MP_TUNNELBRIDGE:

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			if (IsTunnel(tile)) {

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				if (GetTunnelTransportType(tile) != TRANSPORT_ROAD) return ROAD_NONE;

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				return DiagDirToRoadBits(ReverseDiagDir(GetTunnelDirection(tile)));

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			} else {

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				if (GetBridgeTransportType(tile) != TRANSPORT_ROAD) return ROAD_NONE;

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				return DiagDirToRoadBits(ReverseDiagDir(GetBridgeRampDirection(tile)));

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			}

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		default: return ROAD_NONE;

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	}

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}

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TrackBits GetAnyRoadTrackBits(TileIndex tile, RoadType rt)

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{

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	uint32 r;

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	/* Don't allow local authorities to build roads through road depots or road stops. */

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	if ((IsTileType(tile, MP_STREET) && IsTileDepotType(tile, TRANSPORT_ROAD)) || (IsTileType(tile, MP_STATION) && !IsDriveThroughStopTile(tile)) || !HASBIT(GetRoadTypes(tile), rt)) {

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		return TRACK_BIT_NONE;

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	}

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	return (TrackBits)(byte)(r | (r >> 8));

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}