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/* $Id$ */

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/** @file pbs.h PBS support routines */

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#ifndef PBS_H

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#define PBS_H

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#include "tile_type.h"

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#include "direction_type.h"

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#include "track_type.h"

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#include "vehicle_type.h"

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TrackBits GetReservedTrackbits(TileIndex t);

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void SetRailwayStationPlatformReservation(TileIndex start, DiagDirection dir, bool b);

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bool TryReserveRailTrack(TileIndex tile, Track t);

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void UnreserveRailTrack(TileIndex tile, Track t);

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/** This struct contains information about the end of a reserved path. */

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struct PBSTileInfo {

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	TileIndex tile;      ///< Tile the path ends, INVALID_TILE if no valid path was found.

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	Trackdir  trackdir;  ///< The reserved trackdir on the tile.

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	bool      okay;      ///< True if tile is a safe wairing position, false otherwise.

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	PBSTileInfo() : tile(INVALID_TILE), trackdir(INVALID_TRACKDIR), okay(false) {}

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	PBSTileInfo(TileIndex _t, Trackdir _td, bool _okay) : tile(_t), trackdir(_td), okay(_okay) {}

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};

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PBSTileInfo FollowTrainReservation(const Vehicle *v, Vehicle **train_on_res = NULL);

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bool IsSafeWaitingPosition(const Vehicle *v, TileIndex tile, Trackdir trackdir, bool include_line_end, bool forbid_90deg = false);

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bool IsWaitingPositionFree(const Vehicle *v, TileIndex tile, Trackdir trackdir, bool forbid_90deg = false);

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Vehicle *GetTrainForReservation(TileIndex tile, Track track);

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/**

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 * Check whether some of tracks is reserved on a tile.

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 *

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 * @param tile the tile

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 * @param tracks the tracks to test

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 * @return true if at least on of tracks is reserved

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 */

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static inline bool HasReservedTracks(TileIndex tile, TrackBits tracks)

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{

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	return (GetReservedTrackbits(tile) & tracks) != TRACK_BIT_NONE;

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}

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#endif /* PBS_H */