/* $Id$ */

#ifndef  YAPF_COSTBASE_HPP
#define  YAPF_COSTBASE_HPP

struct CYapfCostBase {
	static const TrackdirBits   c_upwards_slopes[16];

	FORCEINLINE static bool stSlopeCost(TileIndex tile, Trackdir td)
	{
		if (IsDiagonalTrackdir(td)) {
			if (IsBridgeTile(tile) && IsBridgeRamp(tile)) {
				// it is bridge ramp, check if we are entering the bridge
				if (GetBridgeRampDirection(tile) != TrackdirToExitdir(td)) return false; // no, we are living it, no penalty
				// we are entering the bridge
				// if the tile slope is downwards, then bridge ramp has not upward slope
				uint tile_slope = GetTileSlope(tile, NULL) & 0x0F;
				if ((c_upwards_slopes[tile_slope] & TrackdirToTrackdirBits(ReverseTrackdir(td))) != 0) return false; // tile under ramp goes down, no penalty
				// tile under ramp isn't going down, so ramp must go up
				return true;
			} else {
				// not bridge ramp
				if (IsTunnelTile(tile)) return false; // tunnel entry/exit doesn't slope
				uint tile_slope = GetTileSlope(tile, NULL) & 0x0F;
				if ((c_upwards_slopes[tile_slope] & TrackdirToTrackdirBits(td)) != 0) return true; // slopes uphill => apply penalty
			}
		}
		return false;
	}
};

struct CostRailSettings {
	// look-ahead signal penalty
};


#endif /* YAPF_COSTBASE_HPP */