/* $Id$ */

/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */

/** @file ai_industry.cpp Implementation of AIIndustry. */

#include "ai_industry.hpp"
#include "ai_cargo.hpp"
#include "ai_map.hpp"
#include "../../tile_type.h"
#include "../../industry.h"
#include "../../strings_func.h"
#include "../../station_base.h"
#include "table/strings.h"

/* static */ int32 AIIndustry::GetIndustryCount()
{
	return (int32)::Industry::GetNumItems();
}

/* static */ bool AIIndustry::IsValidIndustry(IndustryID industry_id)
{
	return ::Industry::IsValidID(industry_id);
}

/* static */ char *AIIndustry::GetName(IndustryID industry_id)
{
	if (!IsValidIndustry(industry_id)) return NULL;
	static const int len = 64;
	char *industry_name = MallocT<char>(len);

	::SetDParam(0, industry_id);
	::GetString(industry_name, STR_INDUSTRY_NAME, &industry_name[len - 1]);

	return industry_name;
}

/* static */ bool AIIndustry::IsCargoAccepted(IndustryID industry_id, CargoID cargo_id)
{
	if (!IsValidIndustry(industry_id)) return false;
	if (!AICargo::IsValidCargo(cargo_id)) return false;

	const Industry *i = ::Industry::Get(industry_id);

	for (byte j = 0; j < lengthof(i->accepts_cargo); j++) {
		if (i->accepts_cargo[j] == cargo_id) return true;
	}

	return false;
}

/* static */ int32 AIIndustry::GetStockpiledCargo(IndustryID industry_id, CargoID cargo_id)
{
	if (!IsValidIndustry(industry_id)) return -1;
	if (!AICargo::IsValidCargo(cargo_id)) return -1;

	Industry *ind = ::Industry::Get(industry_id);
	for (uint i = 0; i < lengthof(ind->accepts_cargo); i++) {
		CargoID cid = ind->accepts_cargo[i];
		if (cid == cargo_id) {
			return ind->incoming_cargo_waiting[i];
		}
	}

	return -1;
}

/* static */ int32 AIIndustry::GetLastMonthProduction(IndustryID industry_id, CargoID cargo_id)
{
	if (!IsValidIndustry(industry_id)) return -1;
	if (!AICargo::IsValidCargo(cargo_id)) return -1;

	const Industry *i = ::Industry::Get(industry_id);

	for (byte j = 0; j < lengthof(i->produced_cargo); j++) {
		if (i->produced_cargo[j] == cargo_id) return i->last_month_production[j];
	}

	return -1;
}

/* static */ int32 AIIndustry::GetLastMonthTransported(IndustryID industry_id, CargoID cargo_id)
{
	if (!IsValidIndustry(industry_id)) return -1;
	if (!AICargo::IsValidCargo(cargo_id)) return -1;

	const Industry *i = ::Industry::Get(industry_id);

	for (byte j = 0; j < lengthof(i->produced_cargo); j++) {
		if (i->produced_cargo[j] == cargo_id) return i->last_month_transported[j];
	}

	return -1;
}

/* static */ TileIndex AIIndustry::GetLocation(IndustryID industry_id)
{
	if (!IsValidIndustry(industry_id)) return INVALID_TILE;

	return ::Industry::Get(industry_id)->xy;
}

/* static */ int32 AIIndustry::GetAmountOfStationsAround(IndustryID industry_id)
{
	if (!IsValidIndustry(industry_id)) return -1;

	Industry *ind = ::Industry::Get(industry_id);
	StationList stations;
	::FindStationsAroundTiles(ind->xy, ind->width, ind->height, &stations);
	return (int32)stations.Length();
}

/* static */ int32 AIIndustry::GetDistanceManhattanToTile(IndustryID industry_id, TileIndex tile)
{
	if (!IsValidIndustry(industry_id)) return -1;

	return AIMap::DistanceManhattan(tile, GetLocation(industry_id));
}

/* static */ int32 AIIndustry::GetDistanceSquareToTile(IndustryID industry_id, TileIndex tile)
{
	if (!IsValidIndustry(industry_id)) return -1;

	return AIMap::DistanceSquare(tile, GetLocation(industry_id));
}

/* static */ bool AIIndustry::IsBuiltOnWater(IndustryID industry_id)
{
	if (!IsValidIndustry(industry_id)) return false;

	return (::GetIndustrySpec(::Industry::Get(industry_id)->type)->behaviour & INDUSTRYBEH_BUILT_ONWATER) != 0;
}

/* static */ bool AIIndustry::HasHeliport(IndustryID industry_id)
{
	if (!IsValidIndustry(industry_id)) return false;

	return (::GetIndustrySpec(::Industry::Get(industry_id)->type)->behaviour & INDUSTRYBEH_AI_AIRSHIP_ROUTES) != 0;
}

/* static */ TileIndex AIIndustry::GetHeliportLocation(IndustryID industry_id)
{
	if (!IsValidIndustry(industry_id)) return INVALID_TILE;
	if (!HasHeliport(industry_id)) return INVALID_TILE;

	const Industry *ind = ::Industry::Get(industry_id);
	TILE_LOOP(tile_cur, ind->width, ind->height, ind->xy) {
		if (IsTileType(tile_cur, MP_STATION) && IsOilRig(tile_cur)) {
			return tile_cur;
		}
	}

	return INVALID_TILE;
}

/* static */ bool AIIndustry::HasDock(IndustryID industry_id)
{
	if (!IsValidIndustry(industry_id)) return false;

	return (::GetIndustrySpec(::Industry::Get(industry_id)->type)->behaviour & INDUSTRYBEH_AI_AIRSHIP_ROUTES) != 0;
}

/* static */ TileIndex AIIndustry::GetDockLocation(IndustryID industry_id)
{
	if (!IsValidIndustry(industry_id)) return INVALID_TILE;
	if (!HasDock(industry_id)) return INVALID_TILE;

	const Industry *ind = ::Industry::Get(industry_id);
	TILE_LOOP(tile_cur, ind->width, ind->height, ind->xy) {
		if (IsTileType(tile_cur, MP_STATION) && IsOilRig(tile_cur)) {
			return tile_cur;
		}
	}

	return INVALID_TILE;
}

/* static */ IndustryType AIIndustry::GetIndustryType(IndustryID industry_id)
{
	if (!IsValidIndustry(industry_id)) return INVALID_INDUSTRYTYPE;

	return ::Industry::Get(industry_id)->type;
}