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/* $Id$ */

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/** @file town.h Base of the town class. */

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#ifndef TOWN_H

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#define TOWN_H

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#include "oldpool.h"

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#include "core/bitmath_func.hpp"

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#include "core/random_func.hpp"

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#include "cargo_type.h"

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#include "tile_type.h"

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#include "date_type.h"

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#include "town_type.h"

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#include "player_type.h"

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#include "settings_type.h"

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#include "strings_type.h"

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#include "viewport_type.h"

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#include "economy_type.h"

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enum {

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	HOUSE_NO_CLASS   = 0,

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	NEW_HOUSE_OFFSET = 110,

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	HOUSE_MAX        = 512,

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	INVALID_TOWN     = 0xFFFF,

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	INVALID_HOUSE_ID = 0xFFFF,

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	/* There can only be as many classes as there are new houses, plus one for

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	 * NO_CLASS, as the original houses don't have classes. */

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	HOUSE_CLASS_MAX  = HOUSE_MAX - NEW_HOUSE_OFFSET + 1,

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};

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enum BuildingFlags {

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	TILE_NO_FLAG         =       0,

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	TILE_SIZE_1x1        = 1U << 0,

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	TILE_NOT_SLOPED      = 1U << 1,

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	TILE_SIZE_2x1        = 1U << 2,

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	TILE_SIZE_1x2        = 1U << 3,

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	TILE_SIZE_2x2        = 1U << 4,

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	BUILDING_IS_ANIMATED = 1U << 5,

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	BUILDING_IS_CHURCH   = 1U << 6,

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	BUILDING_IS_STADIUM  = 1U << 7,

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	BUILDING_HAS_1_TILE  = TILE_SIZE_1x1 | TILE_SIZE_2x1 | TILE_SIZE_1x2 | TILE_SIZE_2x2,

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	BUILDING_2_TILES_X   = TILE_SIZE_2x1 | TILE_SIZE_2x2,

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	BUILDING_2_TILES_Y   = TILE_SIZE_1x2 | TILE_SIZE_2x2,

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	BUILDING_HAS_4_TILES = TILE_SIZE_2x2,

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};

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DECLARE_ENUM_AS_BIT_SET(BuildingFlags)

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enum HouseZonesBits {

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	HZB_BEGIN     = 0,

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	HZB_TOWN_EDGE = 0,

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	HZB_TOWN_OUTSKIRT,

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	HZB_TOWN_OUTER_SUBURB,

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	HZB_TOWN_INNER_SUBURB,

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	HZB_TOWN_CENTRE,

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	HZB_END,

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};

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assert_compile(HZB_END == 5);

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DECLARE_POSTFIX_INCREMENT(HouseZonesBits)

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enum HouseZones {                  ///< Bit  Value       Meaning

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	HZ_NOZNS             = 0x0000,  ///<       0          This is just to get rid of zeros, meaning none

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	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

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	HZ_ZON2              = 1U << HZB_TOWN_OUTSKIRT,

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	HZ_ZON3              = 1U << HZB_TOWN_OUTER_SUBURB,

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	HZ_ZON4              = 1U << HZB_TOWN_INNER_SUBURB,

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	HZ_ZON5              = 1U << HZB_TOWN_CENTRE,  ///<  center of town

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	HZ_ZONALL            = 0x001F,  ///<       1F         This is just to englobe all above types at once

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	HZ_SUBARTC_ABOVE     = 0x0800,  ///< 11    800        can appear in sub-arctic climate above the snow line

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	HZ_TEMP              = 0x1000,  ///< 12   1000        can appear in temperate climate

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	HZ_SUBARTC_BELOW     = 0x2000,  ///< 13   2000        can appear in sub-arctic climate below the snow line

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	HZ_SUBTROPIC         = 0x4000,  ///< 14   4000        can appear in subtropical climate

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	HZ_TOYLND            = 0x8000   ///< 15   8000        can appear in toyland climate

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};

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DECLARE_ENUM_AS_BIT_SET(HouseZones)

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enum HouseExtraFlags {

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	NO_EXTRA_FLAG            =       0,

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	BUILDING_IS_HISTORICAL   = 1U << 0,  ///< this house will only appear during town generation in random games, thus the historical

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	BUILDING_IS_PROTECTED    = 1U << 1,  ///< towns and AI will not remove this house, while human players will be able tp

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	SYNCHRONISED_CALLBACK_1B = 1U << 2,  ///< synchronized callback 1B will be performed, on multi tile houses

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	CALLBACK_1A_RANDOM_BITS  = 1U << 3,  ///< callback 1A needs random bits

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};

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DECLARE_ENUM_AS_BIT_SET(HouseExtraFlags)

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struct BuildingCounts {

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	uint8 id_count[HOUSE_MAX];

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	uint8 class_count[HOUSE_CLASS_MAX];

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};

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DECLARE_OLD_POOL(Town, Town, 3, 8000)

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struct Town : PoolItem<Town, TownID, &_Town_pool> {

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	TileIndex xy;

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	/* Current population of people and amount of houses. */

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	uint32 num_houses;

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	uint32 population;

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	/* Town name */

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	uint32 townnamegrfid;

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	uint16 townnametype;

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	uint32 townnameparts;

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	char *name;

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	/* NOSAVE: Location of name sign, UpdateTownVirtCoord updates this. */

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	ViewportSign sign;

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	/* Makes sure we don't build certain house types twice.

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	 * bit 0 = Building funds received

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	 * bit 1 = CHURCH

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	 * bit 2 = STADIUM */

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	byte flags12;

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	/* level of noise that all the airports are generating */

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	uint16 noise_reached;

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	/* Which players have a statue? */

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	byte statues;

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	/* Player ratings as well as a mask that determines which players have a rating. */

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	byte have_ratings;

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	uint8 unwanted[MAX_PLAYERS]; ///< how many months companies aren't wanted by towns (bribe)

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	PlayerByte exclusivity;      ///< which player has exslusivity

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	uint8 exclusive_counter;     ///< months till the exclusivity expires

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	int16 ratings[MAX_PLAYERS];

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	/* Maximum amount of passengers and mail that can be transported. */

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	uint32 max_pass;

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	uint32 max_mail;

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	uint32 new_max_pass;

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	uint32 new_max_mail;

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	uint32 act_pass;

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	uint32 act_mail;

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	uint32 new_act_pass;

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	uint32 new_act_mail;

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	/* Amount of passengers that were transported. */

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	byte pct_pass_transported;

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	byte pct_mail_transported;

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	/* Amount of food and paper that was transported. Actually a bit mask would be enough. */

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	uint16 act_food;

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	uint16 act_water;

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	uint16 new_act_food;

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	uint16 new_act_water;

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	/* Time until we rebuild a house. */

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	uint16 time_until_rebuild;

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	/* When to grow town next time. */

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	uint16 grow_counter;

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	int16 growth_rate;

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	/* Fund buildings program in action? */

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	byte fund_buildings_months;

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	/* Fund road reconstruction in action? */

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	byte road_build_months;

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	/* If this is a larger town, and should grow more quickly. */

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	bool larger_town;

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	/* NOSAVE: UpdateTownRadius updates this given the house count. */

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	uint32 squared_town_zone_radius[HZB_END];

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	/* NOSAVE: The number of each type of building in the town. */

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	BuildingCounts building_counts;

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	/* NOSAVE: The town specific road layout */

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	TownLayout layout;

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	/**

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	 * Creates a new town

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	 */

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	Town(TileIndex tile = 0);

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	/** Destroy the town */

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	~Town();

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	inline bool IsValid() const { return this->xy != 0; }

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	void InitializeLayout();

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	inline TownLayout GetActiveLayout() const;

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	/** Calculate the max town noise

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	 * The value is counted using the population divided by the content of the

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	 * entry in town_noise_population corespondig to the town's tolerance.

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	 * To this result, we add 3, which is the noise of the lowest airport.

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	 * So user can at least buld that airport

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	 * @return the maximum noise level the town will tolerate */

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	inline uint16 MaxTownNoise() const {

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		if (this->population == 0) return 0; // no population? no noise

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		return ((this->population / _settings_game.economy.town_noise_population[_settings_game.difficulty.town_council_tolerance]) + 3);

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	}

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};

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/**

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 * Get the current valid layout for the town

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 * @return the active layout for this town

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 */

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inline TownLayout Town::GetActiveLayout() const

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{

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	return (_settings_game.economy.town_layout == TL_RANDOM) ? this->layout : _settings_game.economy.town_layout;

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}

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struct HouseSpec {

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	/* Standard properties */

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	Year min_year;                     ///< introduction year of the house

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	Year max_year;                     ///< last year it can be built

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	byte population;                   ///< population (Zero on other tiles in multi tile house.)

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	byte removal_cost;                 ///< cost multiplier for removing it

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	StringID building_name;            ///< building name

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	uint16 remove_rating_decrease;     ///< rating decrease if removed

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	byte mail_generation;              ///< mail generation multiplier (tile based, as the acceptances below)

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	byte cargo_acceptance[3];          ///< acceptance level for the cargo slots

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	CargoID accepts_cargo[3];          ///< 3 input cargo slots

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	BuildingFlags building_flags;      ///< some flags that describe the house (size, stadium etc...)

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	HouseZones building_availability;  ///< where can it be built (climates, zones)

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	bool enabled;                      ///< the house is available to build (true by default, but can be disabled by newgrf)

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	/* NewHouses properties */

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	HouseID substitute_id;             ///< which original house this one is based on

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	struct SpriteGroup *spritegroup;   ///< pointer to the different sprites of the house

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	HouseID override;                  ///< which house this one replaces

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	uint16 callback_mask;              ///< House callback flags

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	byte random_colour[4];             ///< 4 "random" colours

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	byte probability;                  ///< Relative probability of appearing (16 is the standard value)

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	HouseExtraFlags extra_flags;       ///< some more flags

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	HouseClassID class_id;             ///< defines the class this house has (grf file based) @See HouseGetVariable, prop 0x44

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	byte animation_frames;             ///< number of animation frames

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	byte animation_speed;              ///< amount of time between each of those frames

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	byte processing_time;              ///< Periodic refresh multiplier

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	byte minimum_life;                 ///< The minimum number of years this house will survive before the town rebuilds it

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	/* grf file related properties*/

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	uint8 local_id;                    ///< id defined by the grf file for this house

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	const struct GRFFile *grffile;     ///< grf file that introduced this house

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	/**

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	 * Get the cost for removing this house

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	 * @return the cost (inflation corrected etc)

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	 */

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	Money GetRemovalCost() const;

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};

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extern HouseSpec _house_specs[HOUSE_MAX];

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uint32 GetWorldPopulation();

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void UpdateTownVirtCoord(Town *t);

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void UpdateAllTownVirtCoords();

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void InitializeTown();

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void ShowTownViewWindow(TownID town);

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void ExpandTown(Town *t);

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Town *CreateRandomTown(uint attempts, TownSizeMode mode, uint size);

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enum {

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	ROAD_REMOVE = 0,

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	UNMOVEABLE_REMOVE = 1,

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	TUNNELBRIDGE_REMOVE = 1,

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	INDUSTRY_REMOVE = 2

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};

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/** This is the number of ticks between towns being processed for building new

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 * houses or roads. This value originally came from the size of the town array

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 * in TTD. */

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static const byte TOWN_GROWTH_FREQUENCY = 70;

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/** Simple value that indicates the house has reached the final stage of

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 * construction. */

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static const byte TOWN_HOUSE_COMPLETED = 3;

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/** This enum is used in conjonction with town->flags12.

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 * IT simply states what bit is used for.

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 * It is pretty unrealistic (IMHO) to only have one church/stadium

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 * per town, NO MATTER the population of it.

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 * And there are 5 more bits available on flags12...

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 */

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enum {

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	TOWN_IS_FUNDED      = 0,   ///< Town has received some funds for

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	TOWN_HAS_CHURCH     = 1,   ///< There can be only one church by town.

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	TOWN_HAS_STADIUM    = 2    ///< There can be only one stadium by town.

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};

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bool CheckforTownRating(uint32 flags, Town *t, byte type);

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static inline HouseSpec *GetHouseSpecs(HouseID house_id)

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{

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	assert(house_id < HOUSE_MAX);

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	return &_house_specs[house_id];

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}

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TileIndex GetHouseNorthPart(HouseID &house);

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/**

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 * Check if a TownID is valid.

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 * @param index to inquiry in the pool of town

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 * @return true if it exists

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 */

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static inline bool IsValidTownID(TownID index)

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{

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	return index < GetTownPoolSize() && GetTown(index)->IsValid();

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}

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static inline TownID GetMaxTownIndex()

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{

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	/* TODO - This isn't the real content of the function, but

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	 *  with the new pool-system this will be replaced with one that

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	 *  _really_ returns the highest index. Now it just returns

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	 *  the next safe value we are sure about everything is below.

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	 */

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	return GetTownPoolSize() - 1;

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}

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static inline uint GetNumTowns()

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{

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	extern uint _total_towns;

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	return _total_towns;

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}

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/**

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 * Return a random valid town.

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 */

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static inline Town *GetRandomTown()

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{

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	int num = RandomRange(GetNumTowns());

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	TownID index = INVALID_TOWN;

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	while (num >= 0) {

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		num--;

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		index++;

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		/* Make sure we have a valid town */

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		while (!IsValidTownID(index)) {

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			index++;

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			assert(index <= GetMaxTownIndex());

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		}

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	}

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	return GetTown(index);

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}

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Town *CalcClosestTownFromTile(TileIndex tile, uint threshold);

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#define FOR_ALL_TOWNS_FROM(t, start) for (t = GetTown(start); t != NULL; t = (t->index + 1U < GetTownPoolSize()) ? GetTown(t->index + 1U) : NULL) if (t->IsValid())

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#define FOR_ALL_TOWNS(t) FOR_ALL_TOWNS_FROM(t, 0)

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extern Town *_cleared_town;

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extern int _cleared_town_rating;

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void ResetHouses();

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void ClearTownHouse(Town *t, TileIndex tile);

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void AfterLoadTown();

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void UpdateTownMaxPass(Town *t);

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void UpdateTownRadius(Town *t);

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bool CheckIfAuthorityAllows(TileIndex tile);

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Town *ClosestTownFromTile(TileIndex tile, uint threshold);

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void ChangeTownRating(Town *t, int add, int max);

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HouseZonesBits GetTownRadiusGroup(const Town* t, TileIndex tile);

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void SetTownRatingTestMode(bool mode);

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/**

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 * Calculate a hash value from a tile position

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 *

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 * @param x The X coordinate

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 * @param y The Y coordinate

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 * @return The hash of the tile

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 */

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static inline uint TileHash(uint x, uint y)

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{

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	uint hash = x >> 4;

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	hash ^= x >> 6;

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	hash ^= y >> 4;

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	hash -= y >> 6;

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	return hash;

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}

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/**

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 * Get the last two bits of the TileHash

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 *  from a tile position.

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 *

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 * @see TileHash()

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 * @param x The X coordinate

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 * @param y The Y coordinate

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 * @return The last two bits from hash of the tile

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 */

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static inline uint TileHash2Bit(uint x, uint y)

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{

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	return GB(TileHash(x, y), 0, 2);

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}

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#endif /* TOWN_H */