/* $Id$ */

/** @file station_base.h Base classes/functions for stations. */

#ifndef STATION_BASE_H
#define STATION_BASE_H

#include "station_type.h"
#include "airport.h"
#include "oldpool.h"
#include "cargopacket.h"
#include "cargo_type.h"
#include "town_type.h"
#include "strings_type.h"
#include "date_type.h"
#include "vehicle_type.h"
#include "player_type.h"
#include "core/geometry_type.hpp"
#include "viewport_type.h"
#include <list>

DECLARE_OLD_POOL(Station, Station, 6, 1000)
DECLARE_OLD_POOL(RoadStop, RoadStop, 5, 2000)

static const byte INITIAL_STATION_RATING = 175;

struct GoodsEntry {
	enum AcceptancePickup {
		ACCEPTANCE,
		PICKUP
	};

	GoodsEntry() :
		acceptance_pickup(0),
		days_since_pickup(255),
		rating(INITIAL_STATION_RATING),
		last_speed(0),
		last_age(255)
	{}

	byte acceptance_pickup;
	byte days_since_pickup;
	byte rating;
	byte last_speed;
	byte last_age;
	CargoList cargo; ///< The cargo packets of cargo waiting in this station
};

/** A Stop for a Road Vehicle */
struct RoadStop : PoolItem<RoadStop, RoadStopID, &_RoadStop_pool> {
	static const int  cDebugCtorLevel =  5;  ///< Debug level on which Contructor / Destructor messages are printed
	static const uint LIMIT           = 16;  ///< The maximum amount of roadstops that are allowed at a single station
	static const uint MAX_BAY_COUNT   =  2;  ///< The maximum number of loading bays

	TileIndex        xy;                    ///< Position on the map
	byte             status;                ///< Current status of the Stop. Like which spot is taken. Access using *Bay and *Busy functions.
	byte             num_vehicles;          ///< Number of vehicles currently slotted to this stop
	struct RoadStop  *next;                 ///< Next stop of the given type at this station

	RoadStop(TileIndex tile = 0);
	virtual ~RoadStop();

	/**
	 * Determines whether a road stop exists
	 * @return true if and only is the road stop exists
	 */
	inline bool IsValid() const { return this->xy != 0; }

	/* For accessing status */
	bool HasFreeBay() const;
	bool IsFreeBay(uint nr) const;
	uint AllocateBay();
	void AllocateDriveThroughBay(uint nr);
	void FreeBay(uint nr);
	bool IsEntranceBusy() const;
	void SetEntranceBusy(bool busy);

	RoadStop *GetNextRoadStop(const Vehicle *v) const;
};

struct StationSpecList {
	const StationSpec *spec;
	uint32 grfid;      ///< GRF ID of this custom station
	uint8  localidx;   ///< Station ID within GRF of station
};

/** StationRect - used to track station spread out rectangle - cheaper than scanning whole map */
struct StationRect : public Rect {
	enum StationRectMode
	{
		ADD_TEST = 0,
		ADD_TRY,
		ADD_FORCE
	};

	StationRect();
	void MakeEmpty();
	bool PtInExtendedRect(int x, int y, int distance = 0) const;
	bool IsEmpty() const;
	bool BeforeAddTile(TileIndex tile, StationRectMode mode);
	bool BeforeAddRect(TileIndex tile, int w, int h, StationRectMode mode);
	bool AfterRemoveTile(Station *st, TileIndex tile);
	bool AfterRemoveRect(Station *st, TileIndex tile, int w, int h);

	static bool ScanForStationTiles(StationID st_id, int left_a, int top_a, int right_a, int bottom_a);

	StationRect& operator = (Rect src);
};

struct Station : PoolItem<Station, StationID, &_Station_pool> {
public:
	RoadStop *GetPrimaryRoadStop(RoadStopType type) const
	{
		return type == ROADSTOP_BUS ? bus_stops : truck_stops;
	}

	RoadStop *GetPrimaryRoadStop(const Vehicle *v) const;

	const AirportFTAClass *Airport() const
	{
		if (airport_tile == 0) return GetAirport(AT_DUMMY);
		return GetAirport(airport_type);
	}

	TileIndex xy;
	RoadStop *bus_stops;
	RoadStop *truck_stops;
	TileIndex train_tile;
	TileIndex airport_tile;
	TileIndex dock_tile;
	Town *town;
	StringID string_id;     ///< Default name (town area) of station
	char *name;             ///< Custom name

	ViewportSign sign;

	uint16 had_vehicle_of_type;

	byte time_since_load;
	byte time_since_unload;
	byte delete_ctr;
	PlayerByte owner;
	byte facilities;
	byte airport_type;

	/* trainstation width/height */
	byte trainst_w, trainst_h;

	/** List of custom stations (StationSpecs) allocated to the station */
	uint8 num_specs;
	StationSpecList *speclist;

	Date build_date;

	uint64 airport_flags;   ///< stores which blocks on the airport are taken. was 16 bit earlier on, then 32

	byte last_vehicle_type;
	std::list<Vehicle *> loading_vehicles;
	GoodsEntry goods[NUM_CARGO];

	uint16 random_bits;
	byte waiting_triggers;
	uint8 cached_anim_triggers; ///< Combined animation trigger bitmask, used to determine if trigger processing should happen.

	StationRect rect; ///< Station spread out rectangle (not saved) maintained by StationRect_xxx() functions

	static const int cDebugCtorLevel = 5;

	Station(TileIndex tile = 0);
	virtual ~Station();

	void AddFacility(byte new_facility_bit, TileIndex facil_xy);

	/**
	 * Mark the sign of a station dirty for repaint.
	 *
	 * @ingroup dirty
	 */
	void MarkDirty() const;

	/**
	 * Marks the tiles of the station as dirty.
	 *
	 * @ingroup dirty
	 */
	void MarkTilesDirty(bool cargo_change) const;
	bool TileBelongsToRailStation(TileIndex tile) const;
	uint GetPlatformLength(TileIndex tile, DiagDirection dir) const;
	uint GetPlatformLength(TileIndex tile) const;
	bool IsBuoy() const;

	/**
	 * Determines whether a station exists
	 * @return true if and only is the station exists
	 */
	inline bool IsValid() const { return this->xy != 0; }
};

static inline StationID GetMaxStationIndex()
{
	/* TODO - This isn't the real content of the function, but
	 *  with the new pool-system this will be replaced with one that
	 *  _really_ returns the highest index. Now it just returns
	 *  the next safe value we are sure about everything is below.
	 */
	return GetStationPoolSize() - 1;
}

static inline uint GetNumStations()
{
	return GetStationPoolSize();
}

static inline bool IsValidStationID(StationID index)
{
	return index < GetStationPoolSize() && GetStation(index)->IsValid();
}

#define FOR_ALL_STATIONS_FROM(st, start) for (st = GetStation(start); st != NULL; st = (st->index + 1U < GetStationPoolSize()) ? GetStation(st->index + 1U) : NULL) if (st->IsValid())
#define FOR_ALL_STATIONS(st) FOR_ALL_STATIONS_FROM(st, 0)


/* Stuff for ROADSTOPS */

#define FOR_ALL_ROADSTOPS_FROM(rs, start) for (rs = GetRoadStop(start); rs != NULL; rs = (rs->index + 1U < GetRoadStopPoolSize()) ? GetRoadStop(rs->index + 1U) : NULL) if (rs->IsValid())
#define FOR_ALL_ROADSTOPS(rs) FOR_ALL_ROADSTOPS_FROM(rs, 0)

/* End of stuff for ROADSTOPS */

#endif /* STATION_BASE_H */