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/* $Id$ */

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/** @file newgrf_commons.cpp Implementation of the class OverrideManagerBase

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 * and its descendance, present and futur

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 */

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#include "stdafx.h"

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#include "openttd.h"

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#include "variables.h"

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#include "clear_map.h"

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#include "town.h"

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#include "industry.h"

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#include "newgrf.h"

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#include "newgrf_commons.h"

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/** Constructor of generic class

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 * @param offset end of original data for this entity. i.e: houses = 110

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 * @param maximum of entities this manager can deal with. i.e: houses = 512

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 * @param invalid is the ID used to identify an invalid entity id

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 */

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OverrideManagerBase::OverrideManagerBase(uint16 offset, uint16 maximum, uint16 invalid)

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{

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	max_offset = offset;

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	max_new_entities = maximum;

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	invalid_ID = invalid;

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	mapping_ID = CallocT<EntityIDMapping>(max_new_entities);

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	entity_overrides = MallocT<uint16>(max_offset);

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	memset(entity_overrides, invalid, sizeof(entity_overrides));

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}

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/** Destructor of the generic class.

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 * Frees allocated memory of constructor

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 */

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OverrideManagerBase::~OverrideManagerBase()

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{

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	free(mapping_ID);

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	free(entity_overrides);

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}

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/** Since the entity IDs defined by the GRF file does not necessarily correlate

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 * to those used by the game, the IDs used for overriding old entities must be

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 * translated when the entity spec is set.

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 * @param local_id id in grf file

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 * @param entity_type original entity type

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 */

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void OverrideManagerBase::Add(uint8 local_id, uint entity_type)

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{

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	assert(entity_type < max_offset);

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	entity_overrides[entity_type] = local_id;

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}

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/** Resets the mapping, which is used while initializing game */

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void OverrideManagerBase::ResetMapping()

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{

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	memset(mapping_ID, 0, (max_new_entities - 1) * sizeof(EntityIDMapping));

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}

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/** Resets the override, which is used while initializing game */

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void OverrideManagerBase::ResetOverride()

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{

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	for (uint16 i = 0; i < max_offset; i++) {

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		entity_overrides[i] = invalid_ID;

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	}

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}

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/** Return the ID (if ever available) of a previously inserted entity.

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 * @param grf_local_id ID of this enity withing the grfID

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 * @param grfid ID of the grf file

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 * @return the ID of the candidate, of the Invalid flag item ID

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 */

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uint16 OverrideManagerBase::GetID(uint8 grf_local_id, uint32 grfid)

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{

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	const EntityIDMapping *map;

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	for (uint16 id = max_offset; id < max_new_entities; id++) {

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		map = &mapping_ID[id];

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		if (map->entity_id == grf_local_id && map->grfid == grfid) {

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			return id;

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		}

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	}

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	return invalid_ID;

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}

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/** Reserves a place in the mapping array for an entity to be installed

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 * @param grf_local_id is an arbitrary id given by the grf's author.  Also known as setid

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 * @param grfid is the id of the grf file itself

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 * @param substitute_id is the original entity from which data is copied for the new one

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 * @return the proper usable slot id, or invalid marker if none is found

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 */

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uint16 OverrideManagerBase::AddEntityID(byte grf_local_id, uint32 grfid, byte substitute_id)

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{

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	uint16 id = this->GetID(grf_local_id, grfid);

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	EntityIDMapping *map;

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	/* Look to see if this entity has already been added. This is done

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	 * separately from the loop below in case a GRF has been deleted, and there

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	 * are any gaps in the array.

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	 */

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	if (id != invalid_ID) {

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		return id;

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	}

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	/* This entity hasn't been defined before, so give it an ID now. */

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	for (id = max_offset; id < max_new_entities; id++) {

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		map = &mapping_ID[id];

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		if (map->entity_id == 0 && map->grfid == 0) {

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			map->entity_id     = grf_local_id;

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			map->grfid         = grfid;

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			map->substitute_id = substitute_id;

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			return id;

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		}

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	}

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	return invalid_ID;

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}

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/** Gives the substitute of the entity, as specified by the grf file

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 * @param entity_id of the entity being queried

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 * @return mapped id

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 */

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uint16 OverrideManagerBase::GetSubstituteID(byte entity_id)

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{

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	return mapping_ID[entity_id].substitute_id;

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}

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/** Install the specs into the HouseSpecs array

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 * It will find itself the proper slot onwhich it will go

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 * @param hs HouseSpec read from the grf file, ready for inclusion

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 */

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void HouseOverrideManager::SetEntitySpec(const HouseSpec *hs)

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{

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	HouseID house_id = this->AddEntityID(hs->local_id, hs->grffile->grfid, hs->substitute_id);

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	if (house_id == invalid_ID) {

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		grfmsg(1, "House.SetEntitySpec: Too many houses allocated. Ignoring.");

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		return;

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	}

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	memcpy(&_house_specs[house_id], hs, sizeof(*hs));

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	/* Now add the overrides. */

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	for (int i = 0; i != max_offset; i++) {

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		HouseSpec *overridden_hs = GetHouseSpecs(i);

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		if (entity_overrides[i] != hs->local_id) continue;

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		overridden_hs->override = house_id;

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		entity_overrides[i] = invalid_ID;

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	}

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}

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/** Function used by houses (and soon industries) to get information

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 * on type of "terrain" the tile it is queries sits on.

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 * @param tile TileIndex of the tile been queried

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 * @return value corresponding to the grf expected format:

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 *         Terrain type: 0 normal, 1 desert, 2 rainforest, 4 on or above snowline */

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uint32 GetTerrainType(TileIndex tile)

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{

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	switch (_opt.landscape) {

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		case LT_TROPIC: return GetTropicZone(tile) == TROPICZONE_DESERT ? 1 : 2;

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		case LT_ARCTIC: return (GetClearGround(tile) == CLEAR_SNOW) ? 4 : 0;

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		default:        return 0;

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	}

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}

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