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/* $Id$ */

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#ifndef DEPOT_H

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#define DEPOT_H

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/** @file depot.h Header files for depots (not hangars)

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  * @see depot.c */

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#include "pool.h"

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#include "tile.h"

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#include "variables.h"

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struct Depot {

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	TileIndex xy;

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	uint16 town_index;

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	uint16 index;

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};

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extern MemoryPool _depot_pool;

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/**

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 * Get the pointer to the depot with index 'index'

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 */

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static inline Depot *GetDepot(uint index)

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{

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	return (Depot*)GetItemFromPool(&_depot_pool, index);

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}

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/**

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 * Get the current size of the DepotPool

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 */

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static inline uint16 GetDepotPoolSize(void)

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{

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	return _depot_pool.total_items;

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}

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static inline bool IsDepotIndex(uint index)

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{

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	return index < GetDepotPoolSize();

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}

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#define FOR_ALL_DEPOTS_FROM(d, start) for (d = GetDepot(start); d != NULL; d = (d->index + 1 < GetDepotPoolSize()) ? GetDepot(d->index + 1) : NULL)

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#define FOR_ALL_DEPOTS(d) FOR_ALL_DEPOTS_FROM(d, 0)

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#define MIN_SERVINT_PERCENT  5

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#define MAX_SERVINT_PERCENT 90

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#define MIN_SERVINT_DAYS    30

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#define MAX_SERVINT_DAYS   800

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/** Get the service interval domain.

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 * Get the new proposed service interval for the vehicle is indeed, clamped

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 * within the given bounds. @see MIN_SERVINT_PERCENT ,etc.

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 * @param index proposed service interval

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 */

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static inline uint16 GetServiceIntervalClamped(uint index)

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{

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	return (_patches.servint_ispercent) ? clamp(index, MIN_SERVINT_PERCENT, MAX_SERVINT_PERCENT) : clamp(index, MIN_SERVINT_DAYS, MAX_SERVINT_DAYS);

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}

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VARDEF TileIndex _last_built_train_depot_tile;

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VARDEF TileIndex _last_built_road_depot_tile;

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VARDEF TileIndex _last_built_aircraft_depot_tile;

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VARDEF TileIndex _last_built_ship_depot_tile;

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/**

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 * Check if a depot really exists.

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 */

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static inline bool IsValidDepot(const Depot* depot)

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{

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	return depot->xy != 0; /* XXX: Replace by INVALID_TILE someday */

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}

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/**

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 * Check if a tile is a depot of the given type.

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 */

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static inline bool IsTileDepotType(TileIndex tile, TransportType type)

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{

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	switch(type)

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	{

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		case TRANSPORT_RAIL:

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			return IsTileType(tile, MP_RAILWAY) && (_m[tile].m5 & 0xFC) == 0xC0;

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		case TRANSPORT_ROAD:

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			return IsTileType(tile, MP_STREET) && (_m[tile].m5 & 0xF0) == 0x20;

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		case TRANSPORT_WATER:

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			return IsTileType(tile, MP_WATER) && (_m[tile].m5 & ~3) == 0x80;

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		default:

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			assert(0);

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			return false;

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	}

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}

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/**

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 * Returns the direction the exit of the depot on the given tile is facing.

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 */

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static inline DiagDirection GetDepotDirection(TileIndex tile, TransportType type)

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{

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	assert(IsTileDepotType(tile, type));

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	switch (type)

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	{

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		case TRANSPORT_RAIL:

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		case TRANSPORT_ROAD:

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			/* Rail and road store a diagonal direction in bits 0 and 1 */

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			return (DiagDirection)GB(_m[tile].m5, 0, 2);

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		case TRANSPORT_WATER:

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			/* Water is stubborn, it stores the directions in a different order. */

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			switch (GB(_m[tile].m5, 0, 2)) {

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				case 0: return DIAGDIR_NE;

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				case 1: return DIAGDIR_SW;

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				case 2: return DIAGDIR_NW;

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				case 3: return DIAGDIR_SE;

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			}

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		default:

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			return INVALID_DIAGDIR; /* Not reached */

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	}

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}

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/**

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	Find out if the slope of the tile is suitable to build a depot of given direction

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	@param direction The direction in which the depot's exit points. Starts with 0 as NE and goes Clockwise

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	@param tileh The slope of the tile in question

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	@return true if the construction is possible

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    This is checked by the ugly 0x4C >> direction magic, which does the following:

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      0x4C is 0100 1100 and tileh has only bits 0..3 set (steep tiles are ruled out)

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      So: for direction (only the significant bits are shown)<p>

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      00 (exit towards NE) we need either bit 2 or 3 set in tileh: 0x4C >> 0 = 1100<p>

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      01 (exit towards SE) we need either bit 1 or 2 set in tileh: 0x4C >> 1 = 0110<p>

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      02 (exit towards SW) we need either bit 0 or 1 set in tileh: 0x4C >> 2 = 0011<p>

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      03 (exit towards NW) we need either bit 0 or 4 set in tileh: 0x4C >> 3 = 1001<p>

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      So ((0x4C >> p2) & tileh) determines whether the depot can be built on the current tileh

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*/

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static inline bool CanBuildDepotByTileh(uint32 direction, uint tileh)

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{

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	return (0x4C >> direction) & tileh;

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}

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Depot *GetDepotByTile(TileIndex tile);

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void InitializeDepot(void);

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Depot *AllocateDepot(void);

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void DoDeleteDepot(TileIndex tile);

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#endif /* DEPOT_H */