/*

 * This file is part of OpenTTD.

 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.

 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.

 */

/** @file station_kdtree.h Declarations for accessing the k-d tree of stations */

#ifndef STATION_KDTREE_H

#define STATION_KDTREE_H

#include "core/kdtree.hpp"

#include "core/math_func.hpp"

#include "station_base.h"

#include "map_func.h"

inline uint16 Kdtree_StationXYFunc(StationID stid, int dim) { return (dim == 0) ? TileX(BaseStation::Get(stid)->xy) : TileY(BaseStation::Get(stid)->xy); }

typedef Kdtree<StationID, decltype(&Kdtree_StationXYFunc), uint16, int> StationKdtree;

extern StationKdtree _station_kdtree;

/**

 * Call a function on all stations whose sign is within a radius of a center tile.

 * @param center  Central tile to search around.

 * @param radius  Distance in both X and Y to search within.

 * @param func    The function to call, must take a single parameter which is Station*.

 */

template <typename Func>

void ForAllStationsRadius(TileIndex center, uint radius, Func func)

{

	uint16 x1, y1, x2, y2;

	x1 = (uint16)max<int>(0, TileX(center) - radius);

	x2 = (uint16)min<int>(TileX(center) + radius + 1, MapSizeX());

	y1 = (uint16)max<int>(0, TileY(center) - radius);

	y2 = (uint16)min<int>(TileY(center) + radius + 1, MapSizeY());

	_station_kdtree.FindContained(x1, y1, x2, y2, [&](StationID id) {

		func(Station::Get(id));

	});

}

#endif