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/* $Id$ */

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/** @file ai_map.hpp Everything to query and manipulate map metadata. */

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#ifndef AI_MAP_HPP

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#define AI_MAP_HPP

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#include "ai_object.hpp"

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/**

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 * Class that handles all map related functions.

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 */

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class AIMap : public AIObject {

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public:

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	static const char *GetClassName() { return "AIMap"; }

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	/**

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	 * Checks whether the given tile is valid.

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	 * @param t the tile to check.

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	 * @return true is the tile it within the boundaries of the map.

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	 */

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	static bool IsValidTile(TileIndex t);

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	/**

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	 * Gets the number of tiles in the map.

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	 * @return the size of the map in tiles.

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	 * @post return value is always positive.

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	 */

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	static TileIndex GetMapSize();

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	/**

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	 * Gets the amount of tiles along the SW and NE border.

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	 * @return the length along the SW and NE borders.

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	 * @post return value is always positive.

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	 */

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	static uint32 GetMapSizeX();

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	/**

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	 * Gets the amount of tiles along the SE and NW border.

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	 * @return the length along the SE and NW borders.

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	 * @post return value is always positive.

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	 */

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	static uint32 GetMapSizeY();

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	/**

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	 * Gets the place along the SW/NE border (X-value).

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	 * @param t the tile to get the X-value of.

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	 * @pre t has to be valid (use IsValidTile(t)).

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	 * @return the X-value.

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	 * @post return value is lower than GetMapSizeX().

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	 */

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	static uint32 GetTileX(TileIndex t);

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	/**

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	 * Gets the place along the SE/NW border (Y-value).

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	 * @param t the tile to get the Y-value of.

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	 * @pre t has to be valid (use IsValidTile(t)).

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	 * @return the Y-value.

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	 * @post return value is lower than GetMapSizeY().

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	 */

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	static uint32 GetTileY(TileIndex t);

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	/**

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	 * Gets the TileIndex given a x,y-coordinate.

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	 * @param x the X coordinate.

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	 * @param y the Y coordinate.

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	 * @pre x has to be lower than GetMapSizeX().

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	 * @pre y has to be lower than GetMapSizeY().

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	 * @return the TileIndex for the given x,y coordinate.

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	 */

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	static TileIndex GetTileIndex(uint32 x, uint32 y);

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	/**

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	 * Calculates the Manhattan distance; the difference of

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	 * the X and Y added together.

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	 * @param t1 the start.

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	 * @param t2 the destination.

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	 * @pre t1 has to be valid (use IsValidTile(t1)).

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	 * @pre t2 has to be valid (use IsValidTile(t2)).

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	 * @return the Manhattan distance.

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	 */

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	static uint32 DistanceManhattan(TileIndex t1, TileIndex t2);

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	/**

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	 * Calculates the distance between xy1 and xy2 via 1D calculation.

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	 *  (so the distance between X or the distance between Y, depending

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	 *    on which one is bigger).

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	 * @param t1 the start.

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	 * @param t2 the destination.

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	 * @pre t1 has to be valid (use IsValidTile(t1)).

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	 * @pre t2 has to be valid (use IsValidTile(t2)).

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	 * @return the maximum distance of X and Y.

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	 */

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	static uint32 DistanceMax(TileIndex t1, TileIndex t2);

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	/**

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	 * The squared distance between the two tiles.

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	 * This is the distance is the length of the shortest straight

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	 * line between both points.

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	 * @param t1 the start.

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	 * @param t2 the destination.

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	 * @pre t1 has to be valid (use IsValidTile(t1)).

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	 * @pre t2 has to be valid (use IsValidTile(t2)).

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	 * @return the distance.

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	 */

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	static uint32 DistanceSquare(TileIndex t1, TileIndex t2);

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	/**

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	 * Calculates the shortest distance to the edge.

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	 * @param t from where the distance has to be calculated.

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	 * @pre t has to be valid (use IsValidTile(t)).

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	 * @return the distances to the closest edge.

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	 */

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	static uint32 DistanceFromEdge(TileIndex t);

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};

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#endif /* AI_MAP_HPP */