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[openttd/fttd.git] / src / station_base.h

/* $Id$ */

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

#ifndef STATION_BASE_H
#define STATION_BASE_H

#include "core/random_func.hpp"
#include "base_station_base.h"
#include "newgrf_airport.h"
#include "cargopacket.h"
#include "industry_type.h"
#include "linkgraph/linkgraph_type.h"
#include "newgrf_storage.h"
#include "map/tilearea.h"
#include <map>

static const byte INITIAL_STATION_RATING = 175;

/**
 * Flow statistics telling how much flow should be sent along a link. This is
 * done by creating "flow shares" and using std::map's upper_bound() method to
 * look them up with a random number. A flow share is the difference between a
 * key in a map and the previous key. So one key in the map doesn't actually
 * mean anything by itself.
 */
class FlowStat {
public:
        typedef std::map<uint32, StationID> SharesMap;

        static const SharesMap empty_sharesmap;

        /**
         * Invalid constructor. This can't be called as a FlowStat must not be
         * empty. However, the constructor must be defined and reachable for
         * FlwoStat to be used in a std::map.
         */
        inline FlowStat() {NOT_REACHED();}

        /**
         * Create a FlowStat with an initial entry.
         * @param st Station the initial entry refers to.
         * @param flow Amount of flow for the initial entry.
         * @param restricted If the flow to be added is restricted.
         */
        inline FlowStat(StationID st, uint flow, bool restricted = false)
        {
                assert(flow > 0);
                this->shares[flow] = st;
                this->unrestricted = restricted ? 0 : flow;
        }

        /**
         * Add some flow to the end of the shares map. Only do that if you know
         * that the station isn't in the map yet. Anything else may lead to
         * inconsistencies.
         * @param st Remote station.
         * @param flow Amount of flow to be added.
         * @param restricted If the flow to be added is restricted.
         */
        inline void AppendShare(StationID st, uint flow, bool restricted = false)
        {
                assert(flow > 0);
                this->shares[(--this->shares.end())->first + flow] = st;
                if (!restricted) this->unrestricted += flow;
        }

        uint GetShare(StationID st) const;

        void ChangeShare(StationID st, int flow);

        void RestrictShare(StationID st);

        void ReleaseShare(StationID st);

        void ScaleToMonthly(uint runtime);

        /**
         * Get the actual shares as a const pointer so that they can be iterated
         * over.
         * @return Actual shares.
         */
        inline const SharesMap *GetShares() const { return &this->shares; }

        /**
         * Return total amount of unrestricted shares.
         * @return Amount of unrestricted shares.
         */
        inline uint GetUnrestricted() const { return this->unrestricted; }

        /**
         * Swap the shares maps, and thus the content of this FlowStat with the
         * other one.
         * @param other FlowStat to swap with.
         */
        inline void SwapShares(FlowStat &other)
        {
                this->shares.swap(other.shares);
                Swap(this->unrestricted, other.unrestricted);
        }

        /**
         * Get a station a package can be routed to. This done by drawing a
         * random number between 0 and sum_shares and then looking that up in
         * the map with lower_bound. So each share gets selected with a
         * probability dependent on its flow. Do include restricted flows here.
         * @param is_restricted Output if a restricted flow was chosen.
         * @return A station ID from the shares map.
         */
        inline StationID GetViaWithRestricted(bool &is_restricted) const
        {
                assert(!this->shares.empty());
                uint rand = RandomRange((--this->shares.end())->first);
                is_restricted = rand >= this->unrestricted;
                return this->shares.upper_bound(rand)->second;
        }

        /**
         * Get a station a package can be routed to. This done by drawing a
         * random number between 0 and sum_shares and then looking that up in
         * the map with lower_bound. So each share gets selected with a
         * probability dependent on its flow. Don't include restricted flows.
         * @return A station ID from the shares map.
         */
        inline StationID GetVia() const
        {
                assert(!this->shares.empty());
                return this->unrestricted > 0 ?
                                this->shares.upper_bound(RandomRange(this->unrestricted))->second :
                                INVALID_STATION;
        }

        StationID GetVia(StationID excluded, StationID excluded2 = INVALID_STATION) const;

        void Invalidate();

private:
        SharesMap shares;  ///< Shares of flow to be sent via specified station (or consumed locally).
        uint unrestricted; ///< Limit for unrestricted shares.
};

/** Flow descriptions by origin stations. */
class FlowStatMap : public std::map<StationID, FlowStat> {
public:
        uint GetFlow() const;
        uint GetFlowVia(StationID via) const;
        uint GetFlowFrom(StationID from) const;
        uint GetFlowFromVia(StationID from, StationID via) const;

        void AddFlow(StationID origin, StationID via, uint amount);
        void PassOnFlow(StationID origin, StationID via, uint amount);
        void DeleteFlows (StationID via, StationIDStack *erased = NULL);
        void RestrictFlows(StationID via);
        void ReleaseFlows(StationID via);
        void FinalizeLocalConsumption(StationID self);
};

/**
 * Stores station stats for a single cargo.
 */
struct GoodsEntry {
        /** Status of this cargo for the station. */
        enum GoodsEntryStatus {
                /**
                 * Set when the station accepts the cargo currently for final deliveries.
                 * It is updated every STATION_ACCEPTANCE_TICKS ticks by checking surrounding tiles for acceptance >= 8/8.
                 */
                GES_ACCEPTANCE,

                /**
                 * This indicates whether a cargo has a rating at the station.
                 * Set when cargo was ever waiting at the station.
                 * It is set when cargo supplied by surrounding tiles is moved to the station, or when
                 * arriving vehicles unload/transfer cargo without it being a final delivery.
                 *
                 * This flag is cleared after 255 * STATION_RATING_TICKS of not having seen a pickup.
                 */
                GES_RATING,

                /**
                 * Set when a vehicle ever delivered cargo to the station for final delivery.
                 * This flag is never cleared.
                 */
                GES_EVER_ACCEPTED,

                /**
                 * Set when cargo was delivered for final delivery last month.
                 * This flag is set to the value of GES_CURRENT_MONTH at the start of each month.
                 */
                GES_LAST_MONTH,

                /**
                 * Set when cargo was delivered for final delivery this month.
                 * This flag is reset on the beginning of every month.
                 */
                GES_CURRENT_MONTH,

                /**
                 * Set when cargo was delivered for final delivery during the current STATION_ACCEPTANCE_TICKS interval.
                 * This flag is reset every STATION_ACCEPTANCE_TICKS ticks.
                 */
                GES_ACCEPTED_BIGTICK,
        };

        GoodsEntry() :
                status(0),
                time_since_pickup(255),
                rating(INITIAL_STATION_RATING),
                last_speed(0),
                last_age(255),
                amount_fract(0),
                link_graph(INVALID_LINK_GRAPH),
                node(INVALID_NODE),
                max_waiting_cargo(0)
        {}

        byte status; ///< Status of this cargo, see #GoodsEntryStatus.

        /**
         * Number of rating-intervals (up to 255) since the last vehicle tried to load this cargo.
         * The unit used is STATION_RATING_TICKS.
         * This does not imply there was any cargo to load.
         */
        byte time_since_pickup;

        byte rating;            ///< %Station rating for this cargo.

        /**
         * Maximum speed (up to 255) of the last vehicle that tried to load this cargo.
         * This does not imply there was any cargo to load.
         * The unit used is a special vehicle-specific speed unit for station ratings.
         *  - Trains: km-ish/h
         *  - RV: km-ish/h
         *  - Ships: 0.5 * km-ish/h
         *  - Aircraft: 8 * mph
         */
        byte last_speed;

        /**
         * Age in years (up to 255) of the last vehicle that tried to load this cargo.
         * This does not imply there was any cargo to load.
         */
        byte last_age;

        byte amount_fract;      ///< Fractional part of the amount in the cargo list
        StationCargoList cargo; ///< The cargo packets of cargo waiting in this station

        LinkGraphID link_graph; ///< Link graph this station belongs to.
        NodeID node;            ///< ID of node in link graph referring to this goods entry.
        FlowStatMap flows;      ///< Planned flows through this station.
        uint max_waiting_cargo; ///< Max cargo from this station waiting at any station.

        /**
         * Reports whether a vehicle has ever tried to load the cargo at this station.
         * This does not imply that there was cargo available for loading. Refer to GES_RATING for that.
         * @return true if vehicle tried to load.
         */
        bool HasVehicleEverTriedLoading() const { return this->last_speed != 0; }

        /**
         * Does this cargo have a rating at this station?
         * @return true if the cargo has a rating, i.e. cargo has been moved to the station.
         */
        inline bool HasRating() const
        {
                return HasBit(this->status, GES_RATING);
        }

        /**
         * Get the best next hop for a cargo packet from station source.
         * @param source Source of the packet.
         * @return The chosen next hop or INVALID_STATION if none was found.
         */
        inline StationID GetVia(StationID source) const
        {
                FlowStatMap::const_iterator flow_it(this->flows.find(source));
                return flow_it != this->flows.end() ? flow_it->second.GetVia() : INVALID_STATION;
        }

        /**
         * Get the best next hop for a cargo packet from station source, optionally
         * excluding one or two stations.
         * @param source Source of the packet.
         * @param excluded If this station would be chosen choose the second best one instead.
         * @param excluded2 Second station to be excluded, if != INVALID_STATION.
         * @return The chosen next hop or INVALID_STATION if none was found.
         */
        inline StationID GetVia(StationID source, StationID excluded, StationID excluded2 = INVALID_STATION) const
        {
                FlowStatMap::const_iterator flow_it(this->flows.find(source));
                return flow_it != this->flows.end() ? flow_it->second.GetVia(excluded, excluded2) : INVALID_STATION;
        }
};

/** A Dock */
struct Dock : PooledItem <Dock, DockID, 32, 64000> {
        TileIndex    xy;    ///< Position on the map
        struct Dock *next;  ///< Next dock at this station

        /** Initialises a Dock */
        inline Dock (TileIndex tile = INVALID_TILE) : xy(tile) { }

        /** Check if a tile is the docking tile for this dock. */
        bool is_docking_tile (TileIndex tile)
        {
                return tile == GetDockingTile (this->xy);
        }
};

#define FOR_ALL_DOCKS_FROM(var, start) FOR_ALL_ITEMS_FROM(Dock, dock_index, var, start)
#define FOR_ALL_DOCKS(var) FOR_ALL_DOCKS_FROM(var, 0)

/** All airport-related information. Only valid if tile != INVALID_TILE. */
struct Airport : public TileArea {
        Airport() : TileArea(INVALID_TILE, 0, 0) {}

        uint64 flags;       ///< stores which blocks on the airport are taken. was 16 bit earlier on, then 32
        byte type;          ///< Type of this airport, @see AirportTypes
        byte layout;        ///< Airport layout number.
        DirectionByte rotation; ///< How this airport is rotated.

        PersistentStorage *psa; ///< Persistent storage for NewGRF airports.

        /**
         * Get the AirportSpec that from the airport type of this airport. If there
         * is no airport (\c tile == INVALID_TILE) then return the dummy AirportSpec.
         * @return The AirportSpec for this airport.
         */
        const AirportSpec *GetSpec() const
        {
                if (this->tile == INVALID_TILE) return &AirportSpec::dummy;
                return AirportSpec::Get(this->type);
        }

        /**
         * Get the finite-state machine for this airport or the finite-state machine
         * for the dummy airport in case this isn't an airport.
         * @pre this->type < NEW_AIRPORT_OFFSET.
         * @return The state machine for this airport.
         */
        const AirportFTAClass *GetFTA() const
        {
                return this->GetSpec()->fsm;
        }

        /** Check if this airport has at least one hangar. */
        inline bool HasHangar() const
        {
                return this->GetSpec()->nof_depots > 0;
        }

        /**
         * Add the tileoffset to the base tile of this airport but rotate it first.
         * The base tile is the northernmost tile of this airport. This function
         * helps to make sure that getting the tile of a hangar works even for
         * rotated airport layouts without requiring a rotated array of hangar tiles.
         * @param tidc The tilediff to add to the airport tile.
         * @return The tile of this airport plus the rotated offset.
         */
        inline TileIndex GetRotatedTileFromOffset(CoordDiff diff) const
        {
                const AirportSpec *as = this->GetSpec();
                switch (this->rotation) {
                        case DIR_N: return this->tile + ToTileIndexDiff(diff);

                        case DIR_E: return this->tile + TileDiffXY(diff.y, as->size_x - 1 - diff.x);

                        case DIR_S: return this->tile + TileDiffXY(as->size_x - 1 - diff.x, as->size_y - 1 - diff.y);

                        case DIR_W: return this->tile + TileDiffXY(as->size_y - 1 - diff.y, diff.x);

                        default: NOT_REACHED();
                }
        }

        /**
         * Get the first tile of the given hangar.
         * @param hangar_num The hangar to get the location of.
         * @pre hangar_num < GetNumHangars().
         * @return A tile with the given hangar.
         */
        inline TileIndex GetHangarTile(uint hangar_num) const
        {
                const AirportSpec *as = this->GetSpec();
                for (uint i = 0; i < as->nof_depots; i++) {
                        if (as->depot_table[i].hangar_num == hangar_num) {
                                return this->GetRotatedTileFromOffset(as->depot_table[i].ti);
                        }
                }
                NOT_REACHED();
        }

        /**
         * Get the exit direction of the hangar at a specific tile.
         * @param tile The tile to query.
         * @pre IsHangarTile(tile).
         * @return The exit direction of the hangar, taking airport rotation into account.
         */
        inline Direction GetHangarExitDirection(TileIndex tile) const
        {
                const AirportSpec *as = this->GetSpec();
                const HangarTileTable *htt = GetHangarDataByTile(tile);
                return ChangeDir(htt->dir, DirDifference(this->rotation, as->rotation[0]));
        }

        /**
         * Get the hangar number of the hangar at a specific tile.
         * @param tile The tile to query.
         * @pre IsHangarTile(tile).
         * @return The hangar number of the hangar at the given tile.
         */
        inline uint GetHangarNum(TileIndex tile) const
        {
                const HangarTileTable *htt = GetHangarDataByTile(tile);
                return htt->hangar_num;
        }

        /** Get the number of hangars on this airport. */
        inline uint GetNumHangars() const
        {
                uint num = 0;
                uint counted = 0;
                const AirportSpec *as = this->GetSpec();
                for (uint i = 0; i < as->nof_depots; i++) {
                        if (!HasBit(counted, as->depot_table[i].hangar_num)) {
                                num++;
                                SetBit(counted, as->depot_table[i].hangar_num);
                        }
                }
                return num;
        }

private:
        /**
         * Retrieve hangar information of a hangar at a given tile.
         * @param tile %Tile containing the hangar.
         * @return The requested hangar information.
         * @pre The \a tile must be at a hangar tile at an airport.
         */
        inline const HangarTileTable *GetHangarDataByTile(TileIndex tile) const
        {
                const AirportSpec *as = this->GetSpec();
                for (uint i = 0; i < as->nof_depots; i++) {
                        if (this->GetRotatedTileFromOffset(as->depot_table[i].ti) == tile) {
                                return as->depot_table + i;
                        }
                }
                NOT_REACHED();
        }
};

typedef SmallVector<Industry *, 2> IndustryVector;

/** Station data structure */
struct Station FINAL : SpecializedStation<Station, false> {
public:
        RoadStop *GetPrimaryRoadStop(RoadStopType type) const
        {
                return type == ROADSTOP_BUS ? bus_stops : truck_stops;
        }

        RoadStop *GetPrimaryRoadStop(const struct RoadVehicle *v) const;

        RoadStop *bus_stops;    ///< All the road stops
        TileArea bus_station;   ///< Tile area the bus 'station' part covers
        RoadStop *truck_stops;  ///< All the truck stops
        TileArea truck_station; ///< Tile area the truck 'station' part covers

        Dock *docks;            ///< All the docks
        TileArea dock_area;     ///< Tile area the docks cover

        Airport airport;        ///< Tile area the airport covers

        IndustryType indtype;   ///< Industry type to get the name from

        StationHadVehicleOfTypeByte had_vehicle_of_type;

        byte time_since_load;
        byte time_since_unload;

        byte last_vehicle_type;
        std::list<Vehicle *> loading_vehicles;
        GoodsEntry goods[NUM_CARGO];  ///< Goods at this station
        uint32 always_accepted;       ///< Bitmask of always accepted cargo types (by houses, HQs, industry tiles when industry doesn't accept cargo)

        IndustryVector industries_near; ///< Cached list of industries near the station that can accept cargo, @see DeliverGoodsToIndustry()

        Station(TileIndex tile = INVALID_TILE);
        ~Station();

        void AddFacility(StationFacility new_facility_bit, TileIndex facil_xy);

        void MarkTilesDirty(bool cargo_change) const;

        void UpdateVirtCoord();

        bool CanHandleCargo (CargoID cargo) const
        {
                StationFacility f = IsCargoInClass (cargo, CC_PASSENGERS) ? ~FACIL_TRUCK_STOP : ~FACIL_BUS_STOP;
                return (this->facilities & f) != 0;
        }

        /* virtual */ uint GetPlatformLength(TileIndex tile, DiagDirection dir) const;
        /* virtual */ uint GetPlatformLength(TileIndex tile) const;
        void RecomputeIndustriesNear();
        static void RecomputeIndustriesNearForAll();

        uint GetCatchmentRadius() const;
        TileArea GetCatchmentArea() const;

        inline bool TileBelongsToRailStation(TileIndex tile) const
        {
                return IsRailStationTile(tile) && GetStationIndex(tile) == this->index;
        }

        inline bool IsDockingTile(TileIndex tile) const
        {
                Dock *d;
                for (d = this->docks; d != NULL; d = d->next) {
                        if (d->is_docking_tile (tile)) return true;
                }
                return false;
        }

        inline bool TileBelongsToAirport(TileIndex tile) const
        {
                return IsAirportTile(tile) && GetStationIndex(tile) == this->index;
        }

        uint32 GetNewGRFVariable (const struct GRFFile *grffile, byte variable, byte parameter, bool *available) const OVERRIDE;

        /* virtual */ void GetTileArea(TileArea *ta, StationType type) const;
};

#define FOR_ALL_STATIONS(var) FOR_ALL_BASE_STATIONS_OF_TYPE(Station, var)

#endif /* STATION_BASE_H */