/* $Id$ */

/*
 * 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 house.h definition of HouseSpec and accessors */

#ifndef HOUSE_H
#define HOUSE_H

#include "strings_type.h"
#include "cargo_type.h"
#include "economy_type.h"
#include "date_type.h"
#include "house_type.h"

/** Simple value that indicates the house has reached the final stage of
 * construction. */
static const byte TOWN_HOUSE_COMPLETED = 3;

enum {
	HOUSE_NO_CLASS   = 0,
	NEW_HOUSE_OFFSET = 110,
	HOUSE_MAX        = 512,
	INVALID_HOUSE_ID = 0xFFFF,

	/* There can only be as many classes as there are new houses, plus one for
	 * NO_CLASS, as the original houses don't have classes. */
	HOUSE_CLASS_MAX  = HOUSE_MAX - NEW_HOUSE_OFFSET + 1,
};

enum BuildingFlags {
	TILE_NO_FLAG         =       0,
	TILE_SIZE_1x1        = 1U << 0,
	TILE_NOT_SLOPED      = 1U << 1,
	TILE_SIZE_2x1        = 1U << 2,
	TILE_SIZE_1x2        = 1U << 3,
	TILE_SIZE_2x2        = 1U << 4,
	BUILDING_IS_ANIMATED = 1U << 5,
	BUILDING_IS_CHURCH   = 1U << 6,
	BUILDING_IS_STADIUM  = 1U << 7,
	BUILDING_HAS_1_TILE  = TILE_SIZE_1x1 | TILE_SIZE_2x1 | TILE_SIZE_1x2 | TILE_SIZE_2x2,
	BUILDING_HAS_2_TILES = TILE_SIZE_2x1 | TILE_SIZE_1x2 | TILE_SIZE_2x2,
	BUILDING_2_TILES_X   = TILE_SIZE_2x1 | TILE_SIZE_2x2,
	BUILDING_2_TILES_Y   = TILE_SIZE_1x2 | TILE_SIZE_2x2,
	BUILDING_HAS_4_TILES = TILE_SIZE_2x2,
};
DECLARE_ENUM_AS_BIT_SET(BuildingFlags)

enum HouseZonesBits {
	HZB_BEGIN     = 0,
	HZB_TOWN_EDGE = 0,
	HZB_TOWN_OUTSKIRT,
	HZB_TOWN_OUTER_SUBURB,
	HZB_TOWN_INNER_SUBURB,
	HZB_TOWN_CENTRE,
	HZB_END,
};
assert_compile(HZB_END == 5);

DECLARE_POSTFIX_INCREMENT(HouseZonesBits)

enum HouseZones {                  ///< Bit  Value       Meaning
	HZ_NOZNS             = 0x0000,  ///<       0          This is just to get rid of zeros, meaning none
	HZ_ZON1              = 1U << HZB_TOWN_EDGE,    ///< 0..4 1,2,4,8,10  which town zones the building can be built in, Zone1 been the further suburb
	HZ_ZON2              = 1U << HZB_TOWN_OUTSKIRT,
	HZ_ZON3              = 1U << HZB_TOWN_OUTER_SUBURB,
	HZ_ZON4              = 1U << HZB_TOWN_INNER_SUBURB,
	HZ_ZON5              = 1U << HZB_TOWN_CENTRE,  ///<  center of town
	HZ_ZONALL            = 0x001F,  ///<       1F         This is just to englobe all above types at once
	HZ_SUBARTC_ABOVE     = 0x0800,  ///< 11    800        can appear in sub-arctic climate above the snow line
	HZ_TEMP              = 0x1000,  ///< 12   1000        can appear in temperate climate
	HZ_SUBARTC_BELOW     = 0x2000,  ///< 13   2000        can appear in sub-arctic climate below the snow line
	HZ_SUBTROPIC         = 0x4000,  ///< 14   4000        can appear in subtropical climate
	HZ_TOYLND            = 0x8000   ///< 15   8000        can appear in toyland climate
};
DECLARE_ENUM_AS_BIT_SET(HouseZones)

enum HouseExtraFlags {
	NO_EXTRA_FLAG            =       0,
	BUILDING_IS_HISTORICAL   = 1U << 0,  ///< this house will only appear during town generation in random games, thus the historical
	BUILDING_IS_PROTECTED    = 1U << 1,  ///< towns and AI will not remove this house, while human players will be able to
	SYNCHRONISED_CALLBACK_1B = 1U << 2,  ///< synchronized callback 1B will be performed, on multi tile houses
	CALLBACK_1A_RANDOM_BITS  = 1U << 3,  ///< callback 1A needs random bits
};

DECLARE_ENUM_AS_BIT_SET(HouseExtraFlags)

struct HouseSpec {
	/* Standard properties */
	Year min_year;                     ///< introduction year of the house
	Year max_year;                     ///< last year it can be built
	byte population;                   ///< population (Zero on other tiles in multi tile house.)
	byte removal_cost;                 ///< cost multiplier for removing it
	StringID building_name;            ///< building name
	uint16 remove_rating_decrease;     ///< rating decrease if removed
	byte mail_generation;              ///< mail generation multiplier (tile based, as the acceptances below)
	byte cargo_acceptance[3];          ///< acceptance level for the cargo slots
	CargoID accepts_cargo[3];          ///< 3 input cargo slots
	BuildingFlags building_flags;      ///< some flags that describe the house (size, stadium etc...)
	HouseZones building_availability;  ///< where can it be built (climates, zones)
	bool enabled;                      ///< the house is available to build (true by default, but can be disabled by newgrf)

	/* NewHouses properties */
	HouseID substitute_id;             ///< which original house this one is based on
	struct SpriteGroup *spritegroup;   ///< pointer to the different sprites of the house
	HouseID override;                  ///< which house this one replaces
	uint16 callback_mask;              ///< Bitmask of house callbacks that have to be called
	byte random_colour[4];             ///< 4 "random" colours
	byte probability;                  ///< Relative probability of appearing (16 is the standard value)
	HouseExtraFlags extra_flags;       ///< some more flags
	HouseClassID class_id;             ///< defines the class this house has (grf file based) @See HouseGetVariable, prop 0x44
	byte animation_frames;             ///< number of animation frames
	byte animation_speed;              ///< amount of time between each of those frames
	byte processing_time;              ///< Periodic refresh multiplier
	byte minimum_life;                 ///< The minimum number of years this house will survive before the town rebuilds it

	/* grf file related properties*/
	uint8 local_id;                    ///< id defined by the grf file for this house
	const struct GRFFile *grffile;     ///< grf file that introduced this house

	/**
	 * Get the cost for removing this house
	 * @return the cost (inflation corrected etc)
	 */
	Money GetRemovalCost() const;

	static FORCEINLINE HouseSpec *Get(size_t house_id)
	{
		assert(house_id < HOUSE_MAX);
		extern HouseSpec _house_specs[];
		return &_house_specs[house_id];
	}
};

/**
 * Do HouseID translation for NewGRFs.
 * @param hid the HouseID to get the override for.
 * @return the HouseID to actually work with.
 */
static inline HouseID GetTranslatedHouseID(HouseID hid)
{
	const HouseSpec *hs = HouseSpec::Get(hid);
	return hs->override == INVALID_HOUSE_ID ? hid : hs->override;
}

#endif /* HOUSE_H */
