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/* $Id$ */

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#ifndef  YAPF_COSTBASE_HPP

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#define  YAPF_COSTBASE_HPP

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struct CYapfCostBase {

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	static const TrackdirBits   c_upwards_slopes[16];

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	FORCEINLINE static bool stSlopeCost(TileIndex tile, Trackdir td)

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	{

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		if (IsDiagonalTrackdir(td)) {

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			if (IsBridgeTile(tile)) {

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				// it is bridge ramp, check if we are entering the bridge

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				if (GetBridgeRampDirection(tile) != TrackdirToExitdir(td)) return false; // no, we are living it, no penalty

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				// we are entering the bridge

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				// if the tile slope is downwards, then bridge ramp has not upward slope

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				uint tile_slope = GetTileSlope(tile, NULL) & 0x0F;

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				if ((c_upwards_slopes[tile_slope] & TrackdirToTrackdirBits(ReverseTrackdir(td))) != 0) return false; // tile under ramp goes down, no penalty

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				// tile under ramp isn't going down, so ramp must go up

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				return true;

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			} else {

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				// not bridge ramp

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				if (IsTunnelTile(tile)) return false; // tunnel entry/exit doesn't slope

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				uint tile_slope = GetTileSlope(tile, NULL) & 0x0F;

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				if ((c_upwards_slopes[tile_slope] & TrackdirToTrackdirBits(td)) != 0) return true; // slopes uphill => apply penalty

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			}

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		}

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		return false;

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	}

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};

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struct CostRailSettings {

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	// look-ahead signal penalty

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};

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#endif /* YAPF_COSTBASE_HPP */