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/* $Id$ */

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#include "../stdafx.h"

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#include "yapf.hpp"

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#include "follow_track.hpp"

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#include "yapf_node_rail.hpp"

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#include "yapf_costbase.hpp"

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#include "yapf_costcache.hpp"

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/** translate tileh to the bitset of up-hill trackdirs */

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const TrackdirBits CYapfCostBase::c_upwards_slopes[] = {

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	TRACKDIR_BIT_NONE                    , // no tileh

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	TRACKDIR_BIT_X_SW | TRACKDIR_BIT_Y_NW, // 1

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	TRACKDIR_BIT_X_SW | TRACKDIR_BIT_Y_SE, // 2

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	TRACKDIR_BIT_X_SW                    , // 3

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	TRACKDIR_BIT_X_NE | TRACKDIR_BIT_Y_SE, // 4

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	TRACKDIR_BIT_NONE                    , // 5

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	TRACKDIR_BIT_Y_SE                    , // 6

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	TRACKDIR_BIT_NONE                    , // 7

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	TRACKDIR_BIT_X_NE | TRACKDIR_BIT_Y_NW, // 8,

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	TRACKDIR_BIT_Y_NW                    , // 9

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	TRACKDIR_BIT_NONE                    , //10

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	TRACKDIR_BIT_NONE                    , //11,

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	TRACKDIR_BIT_X_NE                    , //12

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	TRACKDIR_BIT_NONE                    , //13

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	TRACKDIR_BIT_NONE                    , //14

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	TRACKDIR_BIT_NONE                    , //15

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};

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const char* GetTrackdirName(Trackdir td)

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{

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	static const char * const td_names[] = {

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		"INVALID_TRACKDIR",

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		"X_NE",

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		"Y_SE",

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		"UPPER_E",

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		"LOWER_E",

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		"LEFT_S",

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		"RIGHT_S",

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		"<6>",

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		"<7>",

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		"X_SW",

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		"Y_NW",

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		"UPPER_W",

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		"LOWER_W",

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		"LEFT_N",

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		"RIGHT_N",

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		"TRACKDIR_END"

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	};

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	if (((int)td <= (int)TRACKDIR_END)) {

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		int idx = ((int8)td) + 1;

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		return td_names[idx];

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	}

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	return "<invalid value>";

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}

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CStrA GetTrackdirBitsName(TrackdirBits td_bits)

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{

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	CStrA name;

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	for(int tdb = td_bits; tdb != 0; tdb = KillFirstBit2x64(tdb)) {

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		name.Format("%s%s", name.Size() > 0 ? "+" : "", GetTrackdirName((Trackdir)FindFirstBit2x64(tdb)));

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	}

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	return name.Transfer();

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}