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/* $Id$ */

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#include "stdafx.h"

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#include "openttd.h"

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#include "depot.h"

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#include "functions.h"

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#include "tile.h"

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#include "map.h"

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#include "table/strings.h"

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#include "saveload.h"

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#include "order.h"

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enum {

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	/* Max depots: 64000 (8 * 8000) */

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	DEPOT_POOL_BLOCK_SIZE_BITS = 3,       /* In bits, so (1 << 3) == 8 */

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	DEPOT_POOL_MAX_BLOCKS      = 8000,

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};

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/**

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 * Called if a new block is added to the depot-pool

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 */

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static void DepotPoolNewBlock(uint start_item)

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{

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	Depot *d;

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	/* We don't use FOR_ALL here, because FOR_ALL skips invalid items.

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	 * TODO - This is just a temporary stage, this will be removed. */

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	for (d = GetDepot(start_item); d != NULL; d = (d->index + 1 < GetDepotPoolSize()) ? GetDepot(d->index + 1) : NULL) d->index = start_item++;

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}

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/* Initialize the town-pool */

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MemoryPool _depot_pool = { "Depots", DEPOT_POOL_MAX_BLOCKS, DEPOT_POOL_BLOCK_SIZE_BITS, sizeof(Depot), &DepotPoolNewBlock, NULL, 0, 0, NULL };

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/**

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 * Gets a depot from a tile

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 *

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 * @return Returns the depot if the tile had a depot, else it returns NULL

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 */

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Depot *GetDepotByTile(TileIndex tile)

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{

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	Depot *depot;

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	FOR_ALL_DEPOTS(depot) {

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		if (depot->xy == tile) return depot;

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	}

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	return NULL;

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}

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/**

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 * Allocate a new depot

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 */

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Depot *AllocateDepot(void)

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{

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	Depot *d;

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	/* We don't use FOR_ALL here, because FOR_ALL skips invalid items.

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	 * TODO - This is just a temporary stage, this will be removed. */

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	for (d = GetDepot(0); d != NULL; d = (d->index + 1 < GetDepotPoolSize()) ? GetDepot(d->index + 1) : NULL) {

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		if (!IsValidDepot(d)) {

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			uint index = d->index;

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			memset(d, 0, sizeof(Depot));

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			d->index = index;

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			return d;

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		}

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	}

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	/* Check if we can add a block to the pool */

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	if (AddBlockToPool(&_depot_pool)) return AllocateDepot();

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	return NULL;

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}

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/**

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 * Delete a depot

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 */

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void DoDeleteDepot(TileIndex tile)

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{

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	Depot *depot;

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	/* Get the depot */

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	depot = GetDepotByTile(tile);

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	/* Clear the tile */

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	DoClearSquare(tile);

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	/* Clear the depot */

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	depot->xy = 0;

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	/* Clear the depot from all order-lists */

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	RemoveOrderFromAllVehicles(OT_GOTO_DEPOT, depot->index);

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	/* Delete the depot-window */

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	DeleteWindowById(WC_VEHICLE_DEPOT, tile);

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}

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void InitializeDepots(void)

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{

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	CleanPool(&_depot_pool);

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	AddBlockToPool(&_depot_pool);

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}

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static const SaveLoad _depot_desc[] = {

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	SLE_CONDVAR(Depot, xy,         SLE_FILE_U16 | SLE_VAR_U32, 0, 5),

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	SLE_CONDVAR(Depot, xy,         SLE_UINT32,                 6, SL_MAX_VERSION),

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	    SLE_VAR(Depot, town_index, SLE_UINT16),

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	SLE_END()

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};

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static void Save_DEPT(void)

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{

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	Depot *depot;

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	FOR_ALL_DEPOTS(depot) {

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		SlSetArrayIndex(depot->index);

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		SlObject(depot, _depot_desc);

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	}

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}

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static void Load_DEPT(void)

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{

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	int index;

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	while ((index = SlIterateArray()) != -1) {

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		Depot *depot;

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		if (!AddBlockIfNeeded(&_depot_pool, index))

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			error("Depots: failed loading savegame: too many depots");

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		depot = GetDepot(index);

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		SlObject(depot, _depot_desc);

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	}

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}

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const ChunkHandler _depot_chunk_handlers[] = {

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	{ 'DEPT', Save_DEPT, Load_DEPT, CH_ARRAY | CH_LAST},

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};