/*
 * This file is part of the Simutrans project under the Artistic License.
 * (see LICENSE.txt)
 */

#include "api.h"

/** @file api_obj_desc.cc exports goods descriptors - *_desc_t. */

#include "api_obj_desc_base.h"
#include "api_simple.h"
#include "export_desc.h"
#include "get_next.h"
#include "../api_class.h"
#include "../api_function.h"
#include "../../descriptor/bridge_desc.h"
#include "../../descriptor/building_desc.h"
#include "../../descriptor/vehicle_desc.h"
#include "../../descriptor/goods_desc.h"
#include "../../descriptor/roadsign_desc.h"
#include "../../descriptor/way_obj_desc.h"
#include "../../descriptor/factory_desc.h"
#include "../../builder/brueckenbauer.h"
#include "../../builder/hausbauer.h"
#include "../../builder/fabrikbauer.h"
#include "../../builder/tunnelbauer.h"
#include "../../builder/vehikelbauer.h"
#include "../../builder/goods_manager.h"
#include "../../builder/wegbauer.h"
#include "../../obj/roadsign.h"
#include "../../obj/wayobj.h"
#include "../../simhalt.h"
#include "../../simware.h"
#include "../../world/simworld.h"

#define begin_enum(name)
#define end_enum()
#define enum_slot create_slot


using namespace script_api;


SQInteger get_next_ware_desc(HSQUIRRELVM vm)
{
	return generic_get_next(vm, goods_manager_t::get_count());
}


SQInteger get_goods_desc_index(HSQUIRRELVM vm)
{
	uint32 index = param<uint32>::get(vm, -1);

	const char* name = "None"; // fall-back
	if (index < goods_manager_t::get_count()) {
		name = goods_manager_t::get_info(index)->get_name();
	}
	return push_instance(vm, "good_desc_x",  name);
}


bool are_equal(const obj_named_desc_t* a, const obj_named_desc_t* b)
{
	return (a==b);
}


sint64 get_scaled_maintenance(const obj_desc_transport_related_t* desc)
{
	return desc ? welt->scale_with_month_length(desc->get_maintenance()) : 0;
}

sint64 get_scaled_maintenance_vehicle(const vehicle_desc_t* desc)
{
	return desc ? welt->scale_with_month_length(desc->vehicle_desc_t::get_maintenance()) : 0;
}

sint64 get_scaled_maintenance_building(const building_desc_t* desc)
{
	return desc ? welt->scale_with_month_length(desc->get_maintenance(welt)) : 0;
}


bool building_enables(const building_desc_t* desc, uint8 which)
{
	return desc ? desc->get_enabled() & which : 0;
}

SQInteger building_get_size(HSQUIRRELVM vm)
{
	const building_desc_t* desc = param<const building_desc_t*>::get(vm, 1);
	uint8 rotation = param<uint8>::get(vm, 2);
	if (desc) {
		koord size = desc->get_size(rotation);
		// no automatic coordinate transform please
		return push_instance(vm, "coord", size.x, size.y);
	}
	return -1;
}

mytime_t get_intro_retire(const obj_desc_timelined_t* desc, bool intro)
{
	return (uint32)(desc ? ( intro ? desc->get_intro_year_month() : desc->get_retire_year_month() ) : 1);
}


bool is_obsolete_future(const obj_desc_timelined_t* desc, mytime_t time, uint8 what)
{
	if (desc) {
		switch(what) {
			case 0: return desc->is_future(time.raw);
			case 1: return desc->is_retired(time.raw);
			case 2: return desc->is_available(time.raw);
			default: ;
		}
	}
	return false;
}


const vector_tpl<const building_desc_t*>& get_building_list(building_desc_t::btype type)
{
	const vector_tpl<const building_desc_t*>* p = hausbauer_t::get_list(type);

	static const vector_tpl<const building_desc_t*> dummy;

	return p ? *p : dummy;
}


const vector_tpl<const building_desc_t*>& get_available_stations(building_desc_t::btype type, waytype_t wt, const goods_desc_t *freight)
{
	static vector_tpl<const building_desc_t*> dummy;
	dummy.clear();

	switch(type) {
		case building_desc_t::depot:
		case building_desc_t::generic_stop:
		case building_desc_t::generic_extension:
		case building_desc_t::dock:
		case building_desc_t::flat_dock:
			break;
		default:
			return dummy;
	}

	const vector_tpl<const building_desc_t*>* p = hausbauer_t::get_list(type);

	// translate freight to enables-flags
	uint8 enables = 0;
	if (freight  &&  type != building_desc_t::depot) {
		switch(freight->get_catg_index()) {
			case goods_manager_t::INDEX_PAS:  enables = haltestelle_t::PAX;  break;
			case goods_manager_t::INDEX_MAIL: enables = haltestelle_t::POST; break;
			default:                          enables = haltestelle_t::WARE;
		}
	}

	// use wt_all (which is equal to invalid_wt, see api_const.cc) to get buildings for all waytypes
	bool accept_all_wt = wt == invalid_wt  ||  wt == ignore_wt;

	uint16 time = welt->get_timeline_year_month();
	for(building_desc_t const* const desc : *p) {
		if(  desc->get_type()==type
			&&  (accept_all_wt  ||  desc->get_extra()==(uint32)wt)
			&&  (enables==0  ||  (desc->get_enabled()&enables)!=0)
			&&  desc->get_builder()
			&&  desc->is_available(time))
		{

			dummy.append(desc);
		}
	}
	return dummy;
}

sint64 building_get_cost(const building_desc_t* desc)
{
	return desc->get_price(welt) * desc->get_x() * desc->get_y();
}

bool building_is_terminus(const building_desc_t *desc)
{
	return desc  &&  desc->get_type() == building_desc_t::generic_stop  &&  desc->get_all_layouts() == 4;
}

bool can_be_first(const vehicle_desc_t *desc)
{
	return desc->can_follow(NULL);
}

bool can_be_last(const vehicle_desc_t *desc)
{
	return desc->can_lead(NULL);
}

bool is_coupling_allowed(const vehicle_desc_t *desc1, const vehicle_desc_t *desc2)
{
	return desc1  &&  desc2  &&  desc1->can_lead(desc2)  &&  desc2->can_follow(desc1);
}

const vector_tpl<const vehicle_desc_t*>& get_predecessors(const vehicle_desc_t *desc)
{
	static vector_tpl<const vehicle_desc_t*> dummy;
	dummy.clear();
	for(int i=0; i<desc->get_leader_count(); i++) {
		if (desc->get_leader(i)) {
			dummy.append(desc->get_leader(i));
		}
	}
	return dummy;
}

const vector_tpl<const vehicle_desc_t*>& get_successors(const vehicle_desc_t *desc)
{
	static vector_tpl<const vehicle_desc_t*> dummy;
	dummy.clear();
	for(int i=0; i<desc->get_trailer_count(); i++) {
		if (desc->get_trailer(i)) {
			dummy.append(desc->get_trailer(i));
		}
	}
	return dummy;
}

const vector_tpl<const vehicle_desc_t*>& get_available_vehicles(waytype_t wt)
{
	static vector_tpl<const vehicle_desc_t*> dummy;

	bool use_obsolete = welt->get_settings().get_allow_buying_obsolete_vehicles();
	uint16 time = welt->get_timeline_year_month();

	dummy.clear();
	slist_tpl<vehicle_desc_t const*> const& list = vehicle_builder_t::get_info(wt);

	for(vehicle_desc_t const* const i : list) {
		if (!i->is_retired(time)  ||  use_obsolete) {
			if (!i->is_future(time)) {
				dummy.append(i);
			}
		}
	}
	return dummy;
}

uint32 get_power(const vehicle_desc_t *desc)
{
	return desc->get_power() * desc->get_gear();
}

bool vehicle_needs_electrification(const vehicle_desc_t *desc)
{
	return desc->get_power()  &&  (desc->get_engine_type()==vehicle_desc_t::electric);
}

// export of building_desc_t::btype only here
namespace script_api {
	declare_enum_param(building_desc_t::btype, uint16, "building_desc_x::building_type");
};

bool is_traffic_light(const roadsign_desc_t *d)
{
	return !d->is_signal_type()  &&  d->is_traffic_light();
}


sint64 tree_get_price()
{
	return -welt->get_settings().cst_remove_tree;
}


const vector_tpl<const way_obj_desc_t*>& get_available_wayobjs(waytype_t wt)
{
	static vector_tpl<const way_obj_desc_t*> dummy;

	uint16 time = welt->get_timeline_year_month();

	dummy.clear();
	for(auto i : wayobj_t::get_list()) {
		const way_obj_desc_t* desc = i.value;
		if (desc->get_waytype()==wt  &&  desc->is_available(time)  &&  desc->get_builder()) {
			dummy.append(desc);
		}
	}
	return dummy;
}


#ifdef DOXYGEN
/**
 * Description of input/output slots
 */
struct factory_slot_information_x { // begin_class("factory_slot_information_x")
	good_desc_x good; ///< type of produced/consumed good
	integer capacity; ///< capacity to store the good
	integer factor;   ///< production/consumption factor
}; // end_class
#endif

SQInteger get_factory_outputs(HSQUIRRELVM vm)
{
	const factory_desc_t *desc = param<const factory_desc_t *>::get(vm, -1);
	sq_newarray(vm, 0);
	if (desc) {
		for(uint16 i=0; i<desc->get_product_count(); i++) {
			const factory_product_desc_t *fp = desc->get_product(i);
			sq_newtable(vm);
			create_slot(vm, "good", fp->get_output_type());
			create_slot(vm, "capacity", fp->get_capacity());
			create_slot(vm, "factor", fp->get_factor());
			sq_arrayappend(vm, -2);
		}
	}
	return 1;
}

SQInteger get_factory_inputs(HSQUIRRELVM vm)
{
	const factory_desc_t *desc = param<const factory_desc_t *>::get(vm, -1);
	sq_newarray(vm, 0);
	if (desc) {
		for(uint16 i=0; i<desc->get_supplier_count(); i++) {
			const factory_supplier_desc_t *fp = desc->get_supplier(i);
			sq_newtable(vm);
			create_slot(vm, "good", fp->get_input_type());
			create_slot(vm, "capacity", fp->get_capacity());
			create_slot(vm, "factor", fp->get_consumption());
			sq_arrayappend(vm, -2);
		}
	}
	return 1;
}


void export_goods_desc(HSQUIRRELVM vm)
{
	/**
	 * Base class of all object descriptors.
	 */
	create_class<const obj_named_desc_t*>(vm, "obj_desc_x", "extend_get");

	/**
	 * @return raw (untranslated) name
	 * @typemask string()
	 */
	register_method(vm, &obj_named_desc_t::get_name, "get_name");
	/**
	 * Checks if two object descriptor are equal.
	 * @param other
	 * @return true if this==other
	 */
	register_method(vm, &are_equal, "is_equal", true);
	/**
	 * @returns if object is still valid.
	 */
	export_is_valid<const obj_named_desc_t*>(vm); //register_function("is_valid")
	end_class(vm);

	/**
	 * Base class of object descriptors with intro / retire dates.
	 */
	create_class<const obj_desc_timelined_t*>(vm, "obj_desc_time_x", "obj_desc_x");

	/**
	 * @return introduction date of this object
	 */
	register_method_fv(vm, &get_intro_retire, "get_intro_date", freevariable<bool>(true), true);
	/**
	 * @return retirement date of this object
	 */
	register_method_fv(vm, &get_intro_retire, "get_retire_date", freevariable<bool>(false), true);
	/**
	 * @param time to test (0 means no timeline game)
	 * @return true if not available as intro date is in future
	 */
	register_method_fv(vm, &is_obsolete_future, "is_future", freevariable<uint8>(0), true);
	/**
	 * @param time to test (0 means no timeline game)
	 * @return true if not available as retirement date already passed
	 */
	register_method_fv(vm, &is_obsolete_future, "is_retired", freevariable<uint8>(1), true);
	/**
	 * @param time to test (0 means no timeline game)
	 * @return true if available: introduction and retirement date checked
	 */
	register_method_fv(vm, &is_obsolete_future, "is_available", freevariable<uint8>(2), true);
	end_class(vm);

	/**
	 * Base class of object descriptors for transport related stuff.
	 */
	create_class<const obj_desc_transport_related_t*>(vm, "obj_desc_transport_x", "obj_desc_time_x");
	/**
	 * @returns monthly maintenance cost [in 1/100 credits] of one object of this type.
	 */
	register_local_method(vm, &get_scaled_maintenance, "get_maintenance");
	/**
	 * @returns cost [in 1/100 credits] to buy or build one piece or tile of this thing.
	 */
	register_method(vm, &obj_desc_transport_related_t::get_price, "get_cost");
	/**
	 * @returns way type, can be @ref wt_invalid.
	 */
	register_method(vm, &obj_desc_transport_related_t::get_waytype, "get_waytype");
	/**
	 * @returns top speed: maximal possible or allowed speed, in km/h.
	 */
	register_method(vm, &obj_desc_transport_related_t::get_topspeed, "get_topspeed");

	end_class(vm);

	/**
	 * Vehicle descriptors
	 */
	begin_desc_class(vm, "vehicle_desc_x", "obj_desc_transport_x", (GETDESCFUNC)param<const vehicle_desc_t*>::getfunc());
	/**
	 * @returns true if this vehicle can lead a convoy
	 */
	register_method(vm, &can_be_first, "can_be_first", true);
	/**
	 * @returns true if this vehicle can be the last of a convoy
	 */
	register_method(vm, &can_be_last, "can_be_last", true);
	/**
	 * @returns list of possible successors, if list is empty then all are allowed (if @ref can_be_last returns true, or no successors are allowed if @ref can_be_last is false).
	 */
	register_method(vm, &get_successors, "get_successors", true);
	/**
	 * @returns list of possible predecessors, if list is empty then all are allowed (if @ref can_be_first returns true, or no predecessors are allowed if @ref can_be_first is false).
	 */
	register_method(vm, &get_predecessors, "get_predecessors", true);
	/**
	 * @returns a list of all available vehicles at the current in-game-time
	 */
	STATIC register_method(vm, &get_available_vehicles, "get_available_vehicles", false, true);
	/**
	 * Power of the vehicle. This value can be used in convoy_x::calc_max_speed.
	 * It returns (power of vehicle in kW) * (gear value) * 64, where power and gear are as shown in-game.
	 * @returns the total power of the vehicle (takes power and gear from pak-files into account)
	 */
	register_method(vm, &get_power, "get_power", true);
	/**
	 * @returns true if this vehicle needs electrification (and is powered)
	 */
	register_method(vm, &vehicle_needs_electrification, "needs_electrification", true);
	/**
	 * @returns freight that can be transported (or null)
	 */
	register_method(vm, &vehicle_desc_t::get_freight_type, "get_freight");
	/**
	 * @returns capacity
	 */
	register_method(vm, &vehicle_desc_t::get_capacity, "get_capacity");
	/**
	 * @returns running cost in 1/100 credits per tile
	 */
	register_method(vm, &vehicle_desc_t::get_running_cost, "get_running_cost");
	/**
	 * @returns fixed cost in 1/100 credits per month
	 */
	register_method(vm, &get_scaled_maintenance_vehicle, "get_maintenance", true);
	/**
	 * @returns weight of the empty vehicle
	 */
	register_method(vm, &vehicle_desc_t::get_weight, "get_weight"); // in kg
	/**
	 * @returns lengths in @ref units::CARUNITS_PER_TILE
	 */
	register_method(vm, &vehicle_desc_t::get_length, "get_length"); // in CAR_UNITS_PER_TILE
	/**
	 * Checks if the coupling of @p first and @p second is possible in this order.
	 * @param first
	 * @param second
	 * @returns true if coupling is possible
	 */
	STATIC register_method(vm, is_coupling_allowed, "is_coupling_allowed", false, true);
	end_class(vm);

	/**
	 * Object descriptors for trees.
	 */
	begin_desc_class(vm, "tree_desc_x", "obj_desc_x", (GETDESCFUNC)param<const tree_desc_t*>::getfunc());

	/**
	 * Returns price to fell one tree.
	 * @returns price (should be positive)
	 */
	STATIC register_method(vm, tree_get_price, "get_price", false, true);
	end_class(vm);

	/**
	 * Object descriptors for buildings: houses, attractions, stations and extensions, depots, harbours.
	 */
	begin_desc_class(vm, "building_desc_x", "obj_desc_time_x", (GETDESCFUNC)param<const building_desc_t*>::getfunc());

	/**
	 * @returns whether building is an attraction
	 */
	register_method(vm, &building_desc_t::is_attraction, "is_attraction");
	/**
	 * @param rotation
	 * @return size of building in the given @p rotation
	 * @typemask coord(integer)
	 */
	register_function(vm, building_get_size, "get_size", 2,  "x i");
	/**
	 * @return monthly maintenance cost
	 */
	register_method(vm, &get_scaled_maintenance_building, "get_maintenance", true);
	/**
	 * Price to build this building, takes size, level, and type into account.
	 * @return price [in 1/100 credits] to build this building
	 */
	register_method(vm, &building_get_cost, "get_cost", true);
	/**
	 * @return capacity
	 */
	register_method(vm, &building_desc_t::get_capacity, "get_capacity");
	/**
	 * @return whether station building can be built underground
	 */
	register_method(vm, &building_desc_t::can_be_built_underground, "can_be_built_underground");
	/**
	 * @return whether station building can be built above ground
	 */
	register_method(vm, &building_desc_t::can_be_built_aboveground, "can_be_built_aboveground");
	/**
	 * @return whether this station building can handle passengers
	 */
	register_method_fv(vm, &building_enables, "enables_pax", freevariable<uint8>(1), true);
	/**
	 * @return whether this station building can handle mail
	 */
	register_method_fv(vm, &building_enables, "enables_mail", freevariable<uint8>(2), true);
	/**
	 * @return whether this station building can handle freight
	 */
	register_method_fv(vm, &building_enables, "enables_freight", freevariable<uint8>(4), true);
	/// building types
	begin_enum("building_type")
	/// tourist attraction to be built in cities
	enum_slot(vm, "attraction_city", (uint8)building_desc_t::attraction_city, true);
	/// tourist attraction to be built outside cities
	enum_slot(vm, "attraction_land", (uint8)building_desc_t::attraction_land, true);
	/// monument, built only once per map
	enum_slot(vm, "monument", (uint8)building_desc_t::monument, true);
	/// factory
	enum_slot(vm, "factory", (uint8)building_desc_t::factory, true);
	/// townhall
	enum_slot(vm, "townhall", (uint8)building_desc_t::townhall, true);
	/// company headquarters
	enum_slot(vm, "headquarter", (uint8)building_desc_t::headquarters, true);
	/// harbour
	enum_slot(vm, "harbour", (uint8)building_desc_t::dock, true);
	/// harbour without a slope (buildable on flat ground beaches)
	enum_slot(vm, "flat_harbour", (uint8)building_desc_t::flat_dock, true);
	/// depot
	enum_slot(vm, "depot", (uint8)building_desc_t::depot, true);
	/// station
	enum_slot(vm, "station", (uint8)building_desc_t::generic_stop, true);
	/// station extension
	enum_slot(vm, "station_extension", (uint8)building_desc_t::generic_extension, true);
	/// city building: residential
	enum_slot(vm, "city_res", (uint8)building_desc_t::city_res, true);
	/// city building: commercial
	enum_slot(vm, "city_com", (uint8)building_desc_t::city_com, true);
	/// city building: industrial
	enum_slot(vm, "city_ind", (uint8)building_desc_t::city_ind, true);
	end_enum();
	/**
	 * @returns building type
	 */
	register_method(vm, &building_desc_t::get_type, "get_type");

	/**
	 * @returns way type, can be @ref wt_invalid.
	 */
	register_method(vm, &building_desc_t::get_finance_waytype, "get_waytype");

	/**
	 * @returns headquarter level (or -1 if building is not headquarter)
	 */
	register_method(vm, &building_desc_t::get_headquarters_level, "get_headquarter_level");

	/**
	 * Returns an array with all buildings of the given type.
	 * @warning If @p type is one of building_desc_x::harbour, building_desc_x::depot, building_desc_x::station, building_desc_x::station_extension then always the same list is generated.
	 *          You have to filter out e.g. station buildings yourself.
	 */
	STATIC register_method(vm, &get_building_list, "get_building_list", false, true);
	/**
	 * Returns an array of available station/extension/depot buildings.
	 * Entries are of type @ref building_desc_x.
	 * @param type building type from @ref building_desc_x::building_type
	 * @param wt waytype (can be wt_all to ignore waytype of desc)
	 * @param freight station should accept this freight (if equal to {}, i.e., empty table, then return all buildings)
	 * @returns the list
	 */
	STATIC register_method(vm, &get_available_stations, "get_available_stations", false, true);

	/**
	 * @returns true if this is a station building that can be used as terminus
	 */
	register_method(vm, &building_is_terminus, "is_terminus", true);

	end_class(vm);

	/**
	 * Object descriptors for factories.
	 */
	begin_desc_class(vm, "factory_desc_x", "obj_desc_x", (GETDESCFUNC)param<const factory_desc_t*>::getfunc());
	/**
	 * @returns name
	 */
	register_method(vm, &factory_desc_t::get_name, "get_name");
	/**
	 * Descriptor of associated building.
	 */
	register_method(vm, &factory_desc_t::get_building, "get_building_desc");
	/**
	 * @returns true if this factory produces electricity
	 */
	register_method(vm, &factory_desc_t::is_electricity_producer, "is_electricity_producer");
	/**
	 * Initial production of a factory is get_productivity_base() + rand( get_productivity_range() ).
	 * @returns base production
	 */
	register_method(vm, &factory_desc_t::get_productivity, "get_productivity_base");
	/**
	 * @returns base production variable range
	 */
	register_method(vm, &factory_desc_t::get_range, "get_productivity_range");
	/**
	 * Returns array with information about input goods
	 * @typemask array<factory_slot_information_x> ()
	 */
	register_function(vm, get_factory_inputs, "get_inputs", 1, "t|x|y");
	/**
	 * Returns array with information about input goods
	 * @typemask array<factory_slot_information_x> ()
	 */
	register_function(vm, get_factory_outputs, "get_outputs", 1, "t|x|y");
	/**
	 * Returns table with all factory types.
	 * The factory names are used as table keys.
	 */
	register_method(vm, &factory_builder_t::get_factory_table, "get_list", 1);

	end_class(vm);

	/**
	 * Object descriptors for ways.
	 */
	begin_desc_class(vm, "way_desc_x", "obj_desc_transport_x", (GETDESCFUNC)param<const way_desc_t*>::getfunc());
	/**
	 * @returns true if this way can be build on the steeper (double) slopes.
	 */
	register_method(vm, &way_desc_t::has_double_slopes, "has_double_slopes");
	/**
	 * @returns system type of the way, see @ref way_system_types.
	 */
	register_method(vm, &way_desc_t::get_styp, "get_system_type");

	/**
	 * Generates a list of all ways available for building.
	 * @param wt waytype
	 * @param st system type of way
	 * @returns the list
	 */
	STATIC register_method(vm, way_builder_t::get_way_list, "get_available_ways", false, true);

	end_class(vm);

	/**
	 * Object descriptors for tunnels.
	 */
	begin_desc_class(vm, "tunnel_desc_x", "obj_desc_transport_x", (GETDESCFUNC)param<const tunnel_desc_t*>::getfunc());
	/**
	 * Returns a list with available tunnel types.
	 */
	STATIC register_method(vm, tunnel_builder_t::get_available_tunnels, "get_available_tunnels", false, true);
	end_class(vm);

	/**
	 * Object descriptors for bridges.
	 */
	begin_desc_class(vm, "bridge_desc_x", "obj_desc_transport_x", (GETDESCFUNC)param<const bridge_desc_t*>::getfunc());
	/**
	 * @return true if this bridge can raise two level from flat terrain
	 */
	register_method(vm, &bridge_desc_t::has_double_ramp, "has_double_ramp");
	/**
	 * @return true if this bridge can start or end on a double slope
	 */
	register_method(vm, &bridge_desc_t::has_double_start, "has_double_start");
	/**
	 * @return maximal bridge length in tiles
	 */
	register_method(vm, &bridge_desc_t::get_max_length, "get_max_length");
	/**
	 * @return maximal bridge height
	 */
	register_method(vm, &bridge_desc_t::get_max_height, "get_max_height");
	/**
	 * Returns a bridge with the given name
	 */
	STATIC register_method(vm, bridge_builder_t::get_desc, "get_desc", false, true);
	/**
	 * Returns a list with available bridge types.
	 */
	STATIC register_method(vm, bridge_builder_t::get_available_bridges, "get_available_bridges", false, true);

	end_class(vm);

	/**
	 * Implements iterator to iterate through the list of all good types.
	 *
	 * Usage:
	 * @code
	 * local list = good_desc_list_x()
	 * foreach(good_desc in list) {
	 *     ... // good_desc is an instance of the good_desc_x class
	 * }
	 * @endcode
	 */
	create_class(vm, "good_desc_list_x", 0);
	/**
	 * Meta-method to be used in foreach loops. Do not call them directly.
	 */
	register_function(vm, get_next_ware_desc,  "_nexti",  2, "x o|i");
	/**
	 * Meta-method to be used in foreach loops. Do not call them directly.
	 */
	register_function(vm, get_goods_desc_index, "_get",    2, "xi");

	end_class(vm);

	/**
	 * Descriptor of goods and freight types.
	 */
	begin_desc_class(vm, "good_desc_x", "obj_desc_x", (GETDESCFUNC)param<const goods_desc_t*>::getfunc());

	// dummy entry to create documentation of constructor
	/**
	 * Constructor.
	 * @param name raw name of the freight type.
	 * @typemask (string)
	 */
	// register_function( .., "constructor", .. )

	create_slot(vm, "passenger", goods_manager_t::passengers, true);
	create_slot(vm, "mail",      goods_manager_t::mail,       true);
#ifdef DOXYGEN
	static good_desc_x passenger; ///< descriptor for passenger
	static good_desc_x mail;      ///< descriptor for mail
#endif
	/**
	 * @return freight category. 0=Passengers, 1=Mail, 2=None, >=3 anything else
	 */
	register_method(vm, &goods_desc_t::get_catg_index, "get_catg_index");

	/**
	 * Checks if this good can be interchanged with the other, in terms of
	 * transportability.
	 */
	register_method(vm, &goods_desc_t::is_interchangeable, "is_interchangeable");
	/**
	 * @returns weight of one unit of this freight
	 */
	register_method(vm, &goods_desc_t::get_weight_per_unit, "get_weight_per_unit"); // in kg

	/**
	 * @returns metric unit name
	 */
	register_method(vm, &goods_desc_t::get_mass, "get_metric");

	/**
	 * Calculates transport revenue per tile and freight unit.
	 * Takes speedbonus into account.
	 * Value contains an additional factor of 3000. Don't ask.
	 * Divide by 3000 *after* calculating revenue for a loaded convoy.
	 * @param wt waytype of vehicle
	 * @param speedkmh actual achieved speed in km/h
	 * @returns revenue
	 */
	register_method(vm, &ware_t::calc_revenue, "calc_revenue", true);
	end_class(vm);

	/**
	 * Descriptor of roadsigns and signals.
	 */
	begin_desc_class(vm, "sign_desc_x", "obj_desc_transport_x", (GETDESCFUNC)param<const roadsign_desc_t*>::getfunc());

	/**
	 * @returns true if sign is one-way sign
	 */
	register_method(vm, &roadsign_desc_t::is_single_way, "is_one_way");
	/**
	 * @returns true if sign is private-way sign
	 */
	register_method(vm, &roadsign_desc_t::is_private_way, "is_private_way");
	/**
	 * @returns true if sign is traffic light
	 */
	register_method(vm, &is_traffic_light, "is_traffic_light", true);
	/**
	 * @returns true if sign is choose sign
	 */
	register_method(vm, &roadsign_desc_t::is_choose_sign, "is_choose_sign");
	/**
	 * @returns true if sign is signal
	 */
	register_method(vm, &roadsign_desc_t::is_simple_signal, "is_signal");
	/**
	 * @returns true if sign is pre signal (distant signal)
	 */
	register_method(vm, &roadsign_desc_t::is_pre_signal, "is_pre_signal");
	/**
	 * @returns true if sign is priority signal
	 */
	register_method(vm, &roadsign_desc_t::is_priority_signal, "is_priority_signal");
	/**
	 * @returns true if sign is long-block signal
	 */
	register_method(vm, &roadsign_desc_t::is_longblock_signal, "is_longblock_signal");
	/**
	 * @returns true if sign is end-of-choose sign
	 */
	register_method(vm, &roadsign_desc_t::is_end_choose_signal, "is_end_choose_signal");
	/**
	 * Returns a list with available sign types.
	 * @param wt waytype
	 */
	STATIC register_method(vm, roadsign_t::get_available_signs, "get_available_signs", false, true);

	end_class(vm);
	/**
	 * Descriptor of way-objects.
	 */
	begin_desc_class(vm, "wayobj_desc_x", "obj_desc_transport_x", (GETDESCFUNC)param<const way_obj_desc_t*>::getfunc());
	/**
	 * @returns true for over-head lines.
	 */
	register_method(vm, &way_obj_desc_t::is_overhead_line, "is_overhead_line");
	/**
	 * Returns a list with available wayobj-types.
	 * @param wt waytype
	 */
	STATIC register_method(vm, get_available_wayobjs, "get_available_wayobjs", false, true);
	end_class(vm);
}
