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/* $Id$ */

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/** @file track_type.h All types related to tracks */

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#ifndef TRACK_TYPE_H

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#define TRACK_TYPE_H

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#include "core/enum_type.hpp"

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/**

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 * These are used to specify a single track.

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 * Can be translated to a trackbit with TrackToTrackbit

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 */

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enum Track {

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	TRACK_BEGIN = 0,        ///< Used for iterations

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	TRACK_X     = 0,        ///< Track along the x-axis (north-east to south-west)

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	TRACK_Y     = 1,        ///< Track along the y-axis (north-west to south-east)

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	TRACK_UPPER = 2,        ///< Track in the upper corner of the tile (north)

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	TRACK_LOWER = 3,        ///< Track in the lower corner of the tile (south)

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	TRACK_LEFT  = 4,        ///< Track in the left corner of the tile (west)

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	TRACK_RIGHT = 5,        ///< Track in the right corner of the tile (east)

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	TRACK_END,              ///< Used for iterations

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	INVALID_TRACK = 0xFF    ///< Flag for an invalid track

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};

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/** Allow incrementing of Track variables */

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DECLARE_POSTFIX_INCREMENT(Track);

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/** Define basic enum properties */

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template <> struct EnumPropsT<Track> : MakeEnumPropsT<Track, byte, TRACK_BEGIN, TRACK_END, INVALID_TRACK> {};

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typedef TinyEnumT<Track> TrackByte;

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/** Bitfield corresponding to Track */

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enum TrackBits {

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	TRACK_BIT_NONE    = 0U,                                                 ///< No track

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	TRACK_BIT_X       = 1U << TRACK_X,                                      ///< X-axis track

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	TRACK_BIT_Y       = 1U << TRACK_Y,                                      ///< Y-axis track

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	TRACK_BIT_UPPER   = 1U << TRACK_UPPER,                                  ///< Upper track

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	TRACK_BIT_LOWER   = 1U << TRACK_LOWER,                                  ///< Lower track

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	TRACK_BIT_LEFT    = 1U << TRACK_LEFT,                                   ///< Left track

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	TRACK_BIT_RIGHT   = 1U << TRACK_RIGHT,                                  ///< Right track

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	TRACK_BIT_CROSS   = TRACK_BIT_X     | TRACK_BIT_Y,                      ///< X-Y-axis cross

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	TRACK_BIT_HORZ    = TRACK_BIT_UPPER | TRACK_BIT_LOWER,                  ///< Upper and lower track

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	TRACK_BIT_VERT    = TRACK_BIT_LEFT  | TRACK_BIT_RIGHT,                  ///< Left and right track

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	TRACK_BIT_3WAY_NE = TRACK_BIT_X     | TRACK_BIT_UPPER | TRACK_BIT_RIGHT,///< "Arrow" to the north-east

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	TRACK_BIT_3WAY_SE = TRACK_BIT_Y     | TRACK_BIT_LOWER | TRACK_BIT_RIGHT,///< "Arrow" to the south-east

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	TRACK_BIT_3WAY_SW = TRACK_BIT_X     | TRACK_BIT_LOWER | TRACK_BIT_LEFT, ///< "Arrow" to the south-west

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	TRACK_BIT_3WAY_NW = TRACK_BIT_Y     | TRACK_BIT_UPPER | TRACK_BIT_LEFT, ///< "Arrow" to the north-west

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	TRACK_BIT_ALL     = TRACK_BIT_CROSS | TRACK_BIT_HORZ  | TRACK_BIT_VERT, ///< All possible tracks

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	TRACK_BIT_MASK    = 0x3FU,                                              ///< Bitmask for the first 6 bits

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	TRACK_BIT_WORMHOLE = 0x40U,                                             ///< Bitflag for a wormhole (used for tunnels)

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	TRACK_BIT_DEPOT   = 0x80U,                                              ///< Bitflag for a depot

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	INVALID_TRACK_BIT = 0xFF                                                ///< Flag for an invalid trackbits value

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};

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/** Define basic enum properties */

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template <> struct EnumPropsT<TrackBits> : MakeEnumPropsT<TrackBits, byte, TRACK_BIT_NONE, TRACK_BIT_ALL, INVALID_TRACK_BIT> {};

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typedef TinyEnumT<TrackBits> TrackBitsByte;

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DECLARE_ENUM_AS_BIT_SET(TrackBits);

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/**

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 * Enumeration for tracks and directions.

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 *

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 * These are a combination of tracks and directions. Values are 0-5 in one

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 * direction (corresponding to the Track enum) and 8-13 in the other direction.

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 * 6, 7, 14 and 15 are used to encode the reversing of road vehicles. Those

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 * reversing track dirs are not considered to be 'valid' except in a small

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 * corner in the road vehicle controller.

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 */

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enum Trackdir {

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	TRACKDIR_BEGIN    =  0,         ///< Used for iterations

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	TRACKDIR_X_NE     =  0,         ///< X-axis and direction to north-east

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	TRACKDIR_Y_SE     =  1,         ///< Y-axis and direction to south-east

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	TRACKDIR_UPPER_E  =  2,         ///< Upper track and direction to east

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	TRACKDIR_LOWER_E  =  3,         ///< Lower track and direction to east

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	TRACKDIR_LEFT_S   =  4,         ///< Left track and direction to south

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	TRACKDIR_RIGHT_S  =  5,         ///< Right track and direction to south

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	TRACKDIR_RVREV_NE =  6,         ///< (Road vehicle) reverse direction north-east

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	TRACKDIR_RVREV_SE =  7,         ///< (Road vehicle) reverse direction south-east

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	TRACKDIR_X_SW     =  8,         ///< X-axis and direction to south-west

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	TRACKDIR_Y_NW     =  9,         ///< Y-axis and direction to north-west

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	TRACKDIR_UPPER_W  = 10,         ///< Upper track and direction to west

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	TRACKDIR_LOWER_W  = 11,         ///< Lower track and direction to west

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	TRACKDIR_LEFT_N   = 12,         ///< Left track and direction to north

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	TRACKDIR_RIGHT_N  = 13,         ///< Right track and direction to north

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	TRACKDIR_RVREV_SW = 14,         ///< (Road vehicle) reverse direction south-west

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	TRACKDIR_RVREV_NW = 15,         ///< (Road vehicle) reverse direction north-west

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	TRACKDIR_END,                   ///< Used for iterations

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	INVALID_TRACKDIR  = 0xFF,       ///< Flag for an invalid trackdir

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};

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/** Define basic enum properties */

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template <> struct EnumPropsT<Trackdir> : MakeEnumPropsT<Trackdir, byte, TRACKDIR_BEGIN, TRACKDIR_END, INVALID_TRACKDIR> {};

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typedef TinyEnumT<Trackdir> TrackdirByte;

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/**

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 * Enumeration of bitmasks for the TrackDirs

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 *

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 * These are a combination of tracks and directions. Values are 0-5 in one

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 * direction (corresponding to the Track enum) and 8-13 in the other direction.

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 */

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enum TrackdirBits {

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	TRACKDIR_BIT_NONE     = 0x0000, ///< No track build

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	TRACKDIR_BIT_X_NE     = 0x0001, ///< Track x-axis, direction north-east

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	TRACKDIR_BIT_Y_SE     = 0x0002, ///< Track y-axis, direction south-east

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	TRACKDIR_BIT_UPPER_E  = 0x0004, ///< Track upper, direction east

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	TRACKDIR_BIT_LOWER_E  = 0x0008, ///< Track lower, direction east

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	TRACKDIR_BIT_LEFT_S   = 0x0010, ///< Track left, direction south

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	TRACKDIR_BIT_RIGHT_S  = 0x0020, ///< Track right, direction south

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	/* Again, note the two missing values here. This enables trackdir -> track conversion by doing (trackdir & 0xFF) */

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	TRACKDIR_BIT_X_SW     = 0x0100, ///< Track x-axis, direction south-west

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	TRACKDIR_BIT_Y_NW     = 0x0200, ///< Track y-axis, direction north-west

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	TRACKDIR_BIT_UPPER_W  = 0x0400, ///< Track upper, direction west

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	TRACKDIR_BIT_LOWER_W  = 0x0800, ///< Track lower, direction west

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	TRACKDIR_BIT_LEFT_N   = 0x1000, ///< Track left, direction north

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	TRACKDIR_BIT_RIGHT_N  = 0x2000, ///< Track right, direction north

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	TRACKDIR_BIT_MASK     = 0x3F3F, ///< Bitmask for bit-operations

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	INVALID_TRACKDIR_BIT  = 0xFFFF, ///< Flag for an invalid trackdirbit value

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};

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/** Define basic enum properties */

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template <> struct EnumPropsT<TrackdirBits> : MakeEnumPropsT<TrackdirBits, uint16, TRACKDIR_BIT_NONE, TRACKDIR_BIT_MASK, INVALID_TRACKDIR_BIT> {};

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typedef TinyEnumT<TrackdirBits> TrackdirBitsShort;

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DECLARE_ENUM_AS_BIT_SET(TrackdirBits);

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typedef uint32 TrackStatus;

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#endif /* TRACK_TYPE_H */