}

	return best_dist;

}

/** Make an analysis of a tile and check for its belonging to the same

 * industry, and/or the same grf file

 * @param new_tile TileIndex of the tile to query

 * @param old_tile TileINdex of teh reference tile

 * @param i Industry to which old_tile belongs to

 * @return value encoded as per NFO specs */

uint32 GetIndustryIDAtOffset(TileIndex new_tile, TileIndex old_tile, const Industry *i)

{

	if (IsTileType(new_tile, MP_INDUSTRY)) {  // Is this an industry tile?

		if (GetIndustryIndex(new_tile) == i->index) {  // Does it belong to the same industry?

			IndustryGfx gfx = GetIndustryGfx(new_tile);

			const IndustryTileSpec *indtsp = GetIndustryTileSpec(gfx);

			const IndustryTileSpec *indold = GetIndustryTileSpec(GetIndustryGfx(old_tile));

			if (gfx < NEW_INDUSTRYOFFSET) {  // Does it belongs to an old type?

				/* It is an old tile.  We have to see if it's been overriden */

				if (indtsp->grf_prop.override == INVALID_INDUSTRYTILE) {  // has it been overridden?

					return 0xFF << 8 | gfx; // no. Tag FF + the gfx id of that tile

				} else { // yes.  FInd out if it is from the same grf file or not

					const IndustryTileSpec *old_tile_ovr = GetIndustryTileSpec(indtsp->grf_prop.override);

					if (old_tile_ovr->grf_prop.grffile->grfid == indold->grf_prop.grffile->grfid) {

						return old_tile_ovr->grf_prop.local_id; // same grf file

					} else {

						return 0xFFFE; // not the same grf file

					}

				}

			} else {

				if (indtsp->grf_prop.spritegroup != NULL) {  // tile has a spritegroup ?

					if (indtsp->grf_prop.grffile->grfid == indold->grf_prop.grffile->grfid) {  // same industry, same grf ?

						return indtsp->grf_prop.local_id;

					} else {

						return 0xFFFE;  // Defined in another grf file

					}

				} else {  // tile has no spritegroup

					return 0xFF << 8 | indtsp->grf_prop.subst_id;  // so just give him the substitute

				}

			}

		}

	}

	return 0xFFFF; // tile is not an industry one or  does not belong to the current industry

}

/** This function implements the industries variables that newGRF defines.

 * @param variable that is queried

 * @param parameter unused

 * @param available will return false if ever the variable asked for does not exist

 * @param ind is of course the industry we are inquiring

 * @return the value stored in the corresponding variable*/

uint32 IndustryGetVariable(const ResolverObject *object, byte variable, byte parameter, bool *available)

{

	const Industry *industry = object->u.industry.ind;

	TileIndex tile   = object->u.industry.tile;

	const IndustrySpec *indspec = GetIndustrySpec(industry->type);

	switch (variable) {

		case 0x40:

		case 0x41:

		case 0x42: { // waiting cargo, but only if those two callback flags are set

			uint16 callback = indspec->callback_flags;

			if (callback & (CBM_IND_PRODUCTION_CARGO_ARRIVAL | callback & CBM_IND_PRODUCTION_256_TICKS)) {

				return max(industry->cargo_waiting[variable - 0x40], (uint16)0x7FFF);

			} else {

				return 0;

			}

		}

		/* TODO: somehow determine whether we're in water or not */

		case 0x43: return GetClosestWaterDistance(tile, true); // Manhattan distance of closes dry/water tile

		/* Get industry ID at offset param */

		case 0x60: return GetIndustryIDAtOffset(GetNearbyTile(parameter, industry->xy), tile, industry);

		case 0x61: return 0; // Get random tile bits at offset param

		case 0x62: // Land info of nearby tiles

		case 0x63: // Animation stage of nerby tiles

		case 0x64: break; // Distance of nearest industry of given type

		/* Get town zone and Manhattan distance of closest town */

 		case 0x65: return GetTownRadiusGroup(industry->town, tile) << 16 | min(DistanceManhattan(tile, industry->town->xy), 0xFFFF);

		/* Get square of Euclidian distance of closes town */

		case 0x66: return GetTownRadiusGroup(industry->town, tile) << 16 | min(DistanceSquare(tile, industry->town->xy), 0xFFFF);

		/* Count of industry, distance of closest instance

		 * format is rr(reserved) cc(count)  dddd(manhattan distance of closest sister)

		 * A lot more should be done, since it has to check for local id, grf id etc...

		 * let's just say it is a beginning ;) */

		case 0x67: return GetIndustryTypeCount(industry->type) << 16 | 0;

		/* Industry founder information.

		 * 0x10 if randomly created or from a map pre-newindustry.

		 * Else, the company who funded it */

		case 0xA7: return 0x10;

		case 0xB0: // Date when built since 1920 (in days)

		case 0xB3: // Construction type

		case 0xB4: break; // Date last cargo accepted since 1920 (in days)

		/* Industry structure access*/

		case 0x80: return industry->xy;

		case 0x81: return GB(industry->xy, 8, 8);

		/* Pointer to the town the industry is associated with */

		case 0x82:

		case 0x83:

		case 0x84:

		case 0x85: break; // not supported

		case 0x86: return industry->width;

		case 0x87: return industry->height;// xy dimensions

		/*  */

		case 0x88:

		case 0x89: return indspec->produced_cargo[variable - 0x88];

		case 0x8A: return industry->cargo_waiting[0];

		case 0x8B: return GB(industry->cargo_waiting[0], 8, 8);

		case 0x8C: return industry->cargo_waiting[1];

		case 0x8D: return GB(industry->cargo_waiting[1], 8, 8);

		case 0x8E:

		case 0x8F: return industry->production_rate[variable - 0x8E];

		case 0x90:

		case 0x91:

		case 0x92: return indspec->accepts_cargo[variable - 0x90];

		case 0x93: return industry->prod_level;

		/* amount of cargo produced so far THIS month. */

		case 0x94: return industry->this_month_production[0];

		case 0x95: return GB(industry->this_month_production[0], 8, 8);

		case 0x96: return industry->this_month_production[1];

		case 0x97: return GB(industry->this_month_production[1], 8, 8);

		/* amount of cargo transported so far THIS month. */

		case 0x98: return industry->this_month_transported[0];

		case 0x99: return GB(industry->this_month_transported[0], 8, 8);

		case 0x9A: return industry->this_month_transported[1];

		case 0x9B: return GB(industry->this_month_transported[0], 8, 8);

		/* fraction of cargo transported LAST month. */

		case 0x9C:

		case 0x9D: return industry->last_month_pct_transported[variable - 0x9C];

		/* amount of cargo produced LAST month. */

		case 0x9E: return industry->last_month_production[0];

		case 0x9F: return GB(industry->last_month_production[0], 8, 8);

		case 0xA0: return industry->last_month_production[1];

		case 0xA1: return GB(industry->last_month_production[1], 8, 8);

		/* amount of cargo transported last month. */

		case 0xA2: return industry->last_month_transported[0];

		case 0xA3: return GB(industry->last_month_transported[0], 8, 8);

		case 0xA4: return industry->last_month_transported[1];

		case 0xA5: return GB(industry->last_month_transported[0], 8, 8);

		case 0xA6: return industry->type;

		case 0xA8: return industry->random_color;

		case 0xA9: return industry->last_prod_year; // capped?

		case 0xAA: return industry->counter;

		case 0xAB: return GB(industry->counter, 8, 8);

		case 0xAC: return industry->was_cargo_delivered;

	}

	DEBUG(grf, 1, "Unhandled industry property 0x%X", variable);

	*available = false;

	return (uint32)-1;

}

static const SpriteGroup *IndustryResolveReal(const ResolverObject *object, const SpriteGroup *group)

{

	/* IndustryTile do not have 'real' groups */

	return NULL;

}

static void NewIndustryResolver(ResolverObject *res, TileIndex tile, Industry *indus)

{

	res->GetRandomBits = IndustryTileGetRandomBits;

	res->GetTriggers   = IndustryTileGetTriggers;

	res->SetTriggers   = IndustryTileSetTriggers;

	res->GetVariable   = IndustryGetVariable;

	res->ResolveReal   = IndustryResolveReal;

	res->u.industry.tile = tile;

	res->u.industry.ind  = indus;

	res->u.industry.gfx  = INVALID_INDUSTRYTILE;

	res->callback        = 0;

	res->callback_param1 = 0;

	res->callback_param2 = 0;

	res->last_value      = 0;

	res->trigger         = 0;

	res->reseed          = 0;

}

{

	ResolverObject object;

	const SpriteGroup *group;

	NewIndustryResolver(&object, tile, industry);

	object.callback = callback;

	object.callback_param1 = param1;

	object.callback_param2 = param2;

	if (group == NULL || group->type != SGT_CALLBACK) return CALLBACK_FAILED;

	return group->g.callback.result;

}

/* $Id$ */

/** @file newgrf_industries.h */

#ifndef NEWGRF_INDUSTRIES_H

#define NEWGRF_INDUSTRIES_H

#include "industry.h"

#include "newgrf_spritegroup.h"

/* in newgrf_industry.cpp */

uint32 IndustryGetVariable(const ResolverObject *object, byte variable, byte parameter, bool *available);

uint32 GetIndustryIDAtOffset(TileIndex new_tile, TileIndex old_tile, const Industry *i);

/* in newgrf_industrytiles.cpp*/

uint32 IndustryTileGetRandomBits(const ResolverObject *object);

uint32 IndustryTileGetTriggers(const ResolverObject *object);

void IndustryTileSetTriggers(const ResolverObject *object, int triggers);

#endif /* NEWGRF_INDUSTRIES_H */