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/* $Id$ */

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/** @file tree_map.h Map accessors for tree tiles. */

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#ifndef TREE_MAP_H

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#define TREE_MAP_H

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/**

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 * List of tree types along all landscape types.

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 *

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 * This enumeration contains a list of the different tree types along

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 * all landscape types. The values for the enumerations may be used for

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 * offsets from the grfs files. These points to the start of

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 * the tree list for a landscape. See the TREE_COUNT_* enumerations

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 * for the amount of different trees for a specific landscape.

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 *

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 * @note TREE_INVALID may be 0xFF according to the coding style, not -1 (Progman)

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 */

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enum TreeType {

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	TREE_INVALID      = -1,   ///< An invalid tree

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	TREE_TEMPERATE    = 0x00, ///< temperate tree

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	TREE_SUB_ARCTIC   = 0x0C, ///< tree on a sub_arctic landscape

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	TREE_RAINFOREST   = 0x14, ///< tree on the 'green part' on a sub-tropical map

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	TREE_CACTUS       = 0x1B, ///< a catus for the 'desert part' on a sub-tropical map

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	TREE_SUB_TROPICAL = 0x1C, ///< tree on a sub-tropical map, non-rainforest, non-desert

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	TREE_TOYLAND      = 0x20, ///< tree on a toyland map

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};

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/**

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 * Counts the number of treetypes for each landscape.

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 *

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 * This list contains the counts of different treetypes for each landscape. This list contains

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 * 5 entries instead of 4 (as there are only 4 landscape types) as the sub tropic landscape

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 * got two types of area, one for normal trees and one only for cacti.

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 */

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enum {

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	TREE_COUNT_TEMPERATE    = TREE_SUB_ARCTIC   - TREE_TEMPERATE,  ///< number of treetypes on a temperate map

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	TREE_COUNT_SUB_ARCTIC   = TREE_RAINFOREST   - TREE_SUB_ARCTIC, ///< number of treetypes on a sub arctic map

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	TREE_COUNT_RAINFOREST   = TREE_CACTUS       - TREE_RAINFOREST, ///< number of treetypes for the 'green part' of a sub tropic map

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	TREE_COUNT_SUB_TROPICAL = TREE_SUB_TROPICAL - TREE_CACTUS,     ///< number of treetypes for the 'desert part' of a sub tropic map

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	TREE_COUNT_TOYLAND      = 9                                    ///< number of treetypes on a toyland map

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};

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/**

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 * Enumeration for ground types of tiles with trees.

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 *

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 * This enumeration defines the ground types for tiles with trees on it.

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 */

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enum TreeGround {

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	TREE_GROUND_GRASS       = 0, ///< normal grass

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	TREE_GROUND_ROUGH       = 1, ///< some rough tile

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	TREE_GROUND_SNOW_DESERT = 2, ///< a desert or snow tile, depend on landscape

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	TREE_GROUND_SHORE       = 3, ///< shore

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};

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/**

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 * Returns the treetype of a tile.

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 *

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 * This function returns the treetype of a given tile. As there are more

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 * possible treetypes for a tile in a game as the enumeration #TreeType defines

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 * this function may be return a value which isn't catch by an entry of the

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 * enumeration #TreeType. But there is no problem known about it.

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 *

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 * @param t The tile to get the treetype from

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 * @return The treetype of the given tile with trees

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 * @pre Tile t must be of type MP_TREES

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 */

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static inline TreeType GetTreeType(TileIndex t)

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{

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	assert(IsTileType(t, MP_TREES));

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	return (TreeType)_m[t].m3;

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}

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/**

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 * Returns the groundtype for tree tiles.

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 *

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 * This function returns the groundtype of a tile with trees.

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 *

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 * @param t The tile to get the groundtype from

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 * @return The groundtype of the tile

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 * @pre Tile must be of type MP_TREES

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 */

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static inline TreeGround GetTreeGround(TileIndex t)

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{

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	assert(IsTileType(t, MP_TREES));

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	return (TreeGround)GB(_m[t].m2, 4, 2);

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}

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/**

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 * Returns the 'density' of a tile with trees.

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 *

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 * This function returns the density of a tile which got trees. Note

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 * that this value doesn't count the number of trees on a tile, use

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 * #GetTreeCount instead. This function instead returns some kind of

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 * groundtype of the tile. As the map-array is finite in size and

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 * the informations about the trees must be saved somehow other

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 * informations about a tile must be saved somewhere encoded in the

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 * tile. So this function returns the density of a tile for sub arctic

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 * and sub tropical games. This means for sub arctic the type of snowline

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 * (0 to 3 for all 4 types of snowtiles) and for sub tropical the value

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 * 3 for a desert (and 0 for non-desert). The functionname is not read as

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 * "get the tree density of a tile" but "get the density of a tile which got trees".

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 *

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 * @param t The tile to get the 'density'

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 * @pre Tile must be of type MP_TREES

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 * @see GetTreeCount

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 */

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static inline uint GetTreeDensity(TileIndex t)

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{

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	assert(IsTileType(t, MP_TREES));

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	return GB(_m[t].m2, 6, 2);

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}

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/**

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 * Set the density and ground type of a tile with trees.

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 *

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 * This functions saves the ground type and the density which belongs to it

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 * for a given tile.

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 *

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 * @param t The tile to set the density and ground type

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 * @param g The ground type to save

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 * @param d The density to save with

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 * @pre Tile must be of type MP_TREES

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 */

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static inline void SetTreeGroundDensity(TileIndex t, TreeGround g, uint d)

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{

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	assert(IsTileType(t, MP_TREES)); // XXX incomplete

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	SB(_m[t].m2, 4, 2, g);

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	SB(_m[t].m2, 6, 2, d);

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}

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/**

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 * Returns the number of trees on a tile.

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 *

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 * This function returns the number of trees of a tile (1-4).

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 * The tile must be contains at least one tree or be more specific: it must be

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 * of type MP_TREES.

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 *

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 * @param t The index to get the number of trees

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 * @return The number of trees (1-4)

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 * @pre Tile must be of type MP_TREES

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 */

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static inline uint GetTreeCount(TileIndex t)

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{

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	assert(IsTileType(t, MP_TREES));

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	return GB(_m[t].m5, 6, 2) + 1;

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}

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/**

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 * Add a amount to the tree-count value of a tile with trees.

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 *

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 * This function add a value to the tree-count value of a tile. This

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 * value may be negative to reduce the tree-counter. If the resulting

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 * value reach 0 it doesn't get converted to a "normal" tile.

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 *

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 * @param t The tile to change the tree amount

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 * @param c The value to add (or reduce) on the tree-count value

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 * @pre Tile must be of type MP_TREES

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 */

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static inline void AddTreeCount(TileIndex t, int c)

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{

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	assert(IsTileType(t, MP_TREES)); // XXX incomplete

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	_m[t].m5 += c << 6;

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}

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/**

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 * Returns the tree growth status.

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 *

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 * This function returns the tree growth status of a tile with trees.

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 *

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 * @param t The tile to get the tree growth status

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 * @return The tree growth status

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 * @pre Tile must be of type MP_TREES

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 */

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static inline uint GetTreeGrowth(TileIndex t)

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{

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	assert(IsTileType(t, MP_TREES));

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	return GB(_m[t].m5, 0, 3);

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}

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/**

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 * Add a value to the tree growth status.

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 *

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 * This function adds a value to the tree grow status of a tile.

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 *

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 * @param t The tile to add the value on

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 * @param a The value to add on the tree growth status

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 * @pre Tile must be of type MP_TREES

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 */

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static inline void AddTreeGrowth(TileIndex t, int a)

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{

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	assert(IsTileType(t, MP_TREES)); // XXX incomplete

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	_m[t].m5 += a;

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}

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/**

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 * Sets the tree growth status of a tile.

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 *

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 * This function sets the tree growth status of a tile directly with

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 * the given value.

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 *

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 * @param t The tile to change the tree growth status

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 * @param g The new value

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 * @pre Tile must be of type MP_TREES

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 */

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static inline void SetTreeGrowth(TileIndex t, uint g)

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{

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	assert(IsTileType(t, MP_TREES)); // XXX incomplete

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	SB(_m[t].m5, 0, 3, g);

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}

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/**

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 * Get the tick counter of a tree tile.

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 *

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 * Returns the saved tick counter of a given tile.

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 *

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 * @param t The tile to get the counter value from

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 * @pre Tile must be of type MP_TREES

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 */

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static inline uint GetTreeCounter(TileIndex t)

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{

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	assert(IsTileType(t, MP_TREES));

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	return GB(_m[t].m2, 0, 4);

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}

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/**

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 * Add a value on the tick counter of a tree-tile

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 *

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 * This function adds a value on the tick counter of a tree-tile.

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 *

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 * @param t The tile to add the value on

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 * @param a The value to add on the tick counter

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 * @pre Tile must be of type MP_TREES

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 */

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static inline void AddTreeCounter(TileIndex t, int a)

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{

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	assert(IsTileType(t, MP_TREES)); // XXX incomplete

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	_m[t].m2 += a;

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}

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/**

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 * Set the tick counter for a tree-tile

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 *

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 * This function sets directly the tick counter for a tree-tile.

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 *

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 * @param t The tile to set the tick counter

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 * @param c The new tick counter value

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 * @pre Tile must be of type MP_TREES

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 */

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static inline void SetTreeCounter(TileIndex t, uint c)

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{

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	assert(IsTileType(t, MP_TREES)); // XXX incomplete

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	SB(_m[t].m2, 0, 4, c);

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}

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/**

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 * Make a tree-tile.

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 *

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 * This functions change the tile to a tile with trees and all informations which belongs to it.

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 *

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 * @param t The tile to make a tree-tile from

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 * @param type The type of the tree

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 * @param set the number of trees

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 * @param growth the growth status

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 * @param ground the ground type

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 * @param density the density (not the number of trees)

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 */

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static inline void MakeTree(TileIndex t, TreeType type, uint count, uint growth, TreeGround ground, uint density)

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{

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	SetTileType(t, MP_TREES);

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	SetTileOwner(t, OWNER_NONE);

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	_m[t].m2 = density << 6 | ground << 4 | 0;

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	_m[t].m3 = type;

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	_m[t].m4 = 0 << 5 | 0 << 2;

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	_m[t].m5 = count << 6 | growth;

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}

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#endif /* TREE_MAP_H */