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/* $Id$ */

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#ifndef VEHICLE_H

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#define VEHICLE_H

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#include "pool.h"

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#include "order.h"

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#include "rail.h"

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enum {

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	VEH_Invalid  = 0x00,

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	VEH_Train    = 0x10,

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	VEH_Road     = 0x11,

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	VEH_Ship     = 0x12,

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	VEH_Aircraft = 0x13,

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	VEH_Special  = 0x14,

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	VEH_Disaster = 0x15,

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} ;

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enum VehStatus {

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	VS_HIDDEN          = 0x01,

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	VS_STOPPED         = 0x02,

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	VS_UNCLICKABLE     = 0x04,

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	VS_DEFPAL          = 0x08,

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	VS_TRAIN_SLOWING   = 0x10,

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	VS_SHADOW          = 0x20,

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	VS_AIRCRAFT_BROKEN = 0x40,

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	VS_CRASHED         = 0x80,

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};

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/* Effect vehicle types */

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typedef enum EffectVehicle {

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	EV_CHIMNEY_SMOKE   = 0,

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	EV_STEAM_SMOKE     = 1,

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	EV_DIESEL_SMOKE    = 2,

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	EV_ELECTRIC_SPARK  = 3,

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	EV_SMOKE           = 4,

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	EV_EXPLOSION_LARGE = 5,

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	EV_BREAKDOWN_SMOKE = 6,

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	EV_EXPLOSION_SMALL = 7,

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	EV_BULLDOZER       = 8,

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	EV_BUBBLE          = 9

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} EffectVehicle;

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typedef struct VehicleRail {

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	uint16 last_speed;		// NOSAVE: only used in UI

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	uint16 crash_anim_pos;

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	uint16 days_since_order_progr;

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	// cached values, recalculated on load and each time a vehicle is added to/removed from the consist.

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	uint16 cached_max_speed;  // max speed of the consist. (minimum of the max speed of all vehicles in the consist)

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	uint32 cached_power;      // total power of the consist.

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	uint8 cached_veh_length;  // length of this vehicle in units of 1/8 of normal length, cached because this can be set by a callback

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	uint16 cached_total_length; ///< Length of the whole train, valid only for first engine.

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	// cached values, recalculated when the cargo on a train changes (in addition to the conditions above)

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	uint16 cached_weight;     // total weight of the consist.

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	uint16 cached_veh_weight; // weight of the vehicle.

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	/**

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	 * Position/type of visual effect.

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	 * bit 0 - 3 = position of effect relative to vehicle. (0 = front, 8 = centre, 15 = rear)

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	 * bit 4 - 5 = type of effect. (0 = default for engine class, 1 = steam, 2 = diesel, 3 = electric)

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	 * bit     6 = disable visual effect.

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	 * bit     7 = disable powered wagons.

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	 */

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	byte cached_vis_effect;

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	// NOSAVE: for wagon override - id of the first engine in train

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	// 0xffff == not in train

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	EngineID first_engine;

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	byte track;

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	byte force_proceed;

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	byte railtype;

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	RailTypeMask compatible_railtypes;

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	byte flags;

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	// Link between the two ends of a multiheaded engine

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	Vehicle *other_multiheaded_part;

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} VehicleRail;

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enum {

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	VRF_REVERSING         = 0,

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	// used to calculate if train is going up or down

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	VRF_GOINGUP           = 1,

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	VRF_GOINGDOWN         = 2,

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	// used to store if a wagon is powered or not

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	VRF_POWEREDWAGON      = 3,

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	// used to reverse the visible direction of the vehicle

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	VRF_REVERSE_DIRECTION = 4,

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};

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typedef struct VehicleAir {

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	uint16 crashed_counter;

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	byte pos;

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	byte previous_pos;

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	StationID targetairport;

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	byte state;

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} VehicleAir;

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typedef struct VehicleRoad {

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	byte state;

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	byte frame;

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	uint16 blocked_ctr;

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	byte overtaking;

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	byte overtaking_ctr;

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	uint16 crashed_ctr;

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	byte reverse_ctr;

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	struct RoadStop *slot;

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	byte slot_age;

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} VehicleRoad;

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typedef struct VehicleSpecial {

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	uint16 unk0;

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	byte unk2;

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} VehicleSpecial;

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typedef struct VehicleDisaster {

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	uint16 image_override;

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	uint16 unk2;

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} VehicleDisaster;

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typedef struct VehicleShip {

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	byte state;

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} VehicleShip;

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struct Vehicle {

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	byte type;               // type, ie roadven,train,ship,aircraft,special

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	byte subtype;            // subtype (Filled with values from EffectVehicles or TrainSubTypes)

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	VehicleID index;         // NOSAVE: Index in vehicle array

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	Vehicle *next;           // next

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	Vehicle *first;          // NOSAVE: pointer to the first vehicle in the chain

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	Vehicle *depot_list;     //NOSAVE: linked list to tell what vehicles entered a depot during the last tick. Used by autoreplace

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	StringID string_id;      // Displayed string

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	UnitID unitnumber;       // unit number, for display purposes only

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	PlayerID owner;          // which player owns the vehicle?

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	TileIndex tile;          // Current tile index

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	TileIndex dest_tile;     // Heading for this tile

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	int32 x_pos;             // coordinates

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	int32 y_pos;

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	byte z_pos;

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	byte direction;          // facing

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	byte spritenum;          // currently displayed sprite index

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	                         // 0xfd == custom sprite, 0xfe == custom second head sprite

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	                         // 0xff == reserved for another custom sprite

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	uint16 cur_image;        // sprite number for this vehicle

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	byte sprite_width;       // width of vehicle sprite

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	byte sprite_height;      // height of vehicle sprite

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	byte z_height;           // z-height of vehicle sprite

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	int8 x_offs;             // x offset for vehicle sprite

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	int8 y_offs;             // y offset for vehicle sprite

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	EngineID engine_type;

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	// for randomized variational spritegroups

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	// bitmask used to resolve them; parts of it get reseeded when triggers

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	// of corresponding spritegroups get matched

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	byte random_bits;

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	byte waiting_triggers;   // triggers to be yet matched

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	uint16 max_speed;        // maximum speed

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	uint16 cur_speed;        // current speed

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	byte subspeed;           // fractional speed

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	byte acceleration;       // used by train & aircraft

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	byte progress;

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	byte vehstatus;          // Status

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	StationID last_station_visited;

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	CargoID cargo_type;      // type of cargo this vehicle is carrying

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	byte cargo_days;         // how many days have the pieces been in transit

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	StationID cargo_source;  // source of cargo

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	uint16 cargo_cap;        // total capacity

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	uint16 cargo_count;      // how many pieces are used

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	byte cargo_subtype;      ///< Used for livery refits (NewGRF variations)

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	byte day_counter;        // increased by one for each day

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	byte tick_counter;       // increased by one for each tick

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	/* Begin Order-stuff */

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	Order current_order;     ///< The current order (+ status, like: loading)

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	OrderID cur_order_index; ///< The index to the current order

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	Order *orders;           ///< Pointer to the first order for this vehicle

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	OrderID num_orders;      ///< How many orders there are in the list

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	Vehicle *next_shared;    ///< If not NULL, this points to the next vehicle that shared the order

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	Vehicle *prev_shared;    ///< If not NULL, this points to the prev vehicle that shared the order

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	/* End Order-stuff */

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	// Boundaries for the current position in the world and a next hash link.

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	// NOSAVE: All of those can be updated with VehiclePositionChanged()

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	int32 left_coord;

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	int32 top_coord;

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	int32 right_coord;

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	int32 bottom_coord;

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	VehicleID next_hash;

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	// Related to age and service time

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	Date age;     // Age in days

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	Date max_age; // Maximum age

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	Date date_of_last_service;

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	Date service_interval;

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	uint16 reliability;

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	uint16 reliability_spd_dec;

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	byte breakdown_ctr;

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	byte breakdown_delay;

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	byte breakdowns_since_last_service;

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	byte breakdown_chance;

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	Year build_year;

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	bool leave_depot_instantly; // NOSAVE: stores if the vehicle needs to leave the depot it just entered. Used by autoreplace

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	uint16 load_unload_time_rem;

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	int32 profit_this_year;

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	int32 profit_last_year;

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	uint32 value;

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	union {

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		VehicleRail rail;

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		VehicleAir air;

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		VehicleRoad road;

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		VehicleSpecial special;

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		VehicleDisaster disaster;

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		VehicleShip ship;

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	} u;

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};

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#define is_custom_sprite(x) (x >= 0xFD)

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#define IS_CUSTOM_FIRSTHEAD_SPRITE(x) (x == 0xFD)

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#define IS_CUSTOM_SECONDHEAD_SPRITE(x) (x == 0xFE)

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typedef void *VehicleFromPosProc(Vehicle *v, void *data);

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void VehicleServiceInDepot(Vehicle *v);

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Vehicle *AllocateVehicle(void);

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bool AllocateVehicles(Vehicle **vl, int num);

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Vehicle *ForceAllocateVehicle(void);

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Vehicle *ForceAllocateSpecialVehicle(void);

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void VehiclePositionChanged(Vehicle *v);

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void AfterLoadVehicles(void);

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Vehicle *GetLastVehicleInChain(Vehicle *v);

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Vehicle *GetPrevVehicleInChain(const Vehicle *v);

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Vehicle *GetFirstVehicleInChain(const Vehicle *v);

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uint CountVehiclesInChain(const Vehicle* v);

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void DeleteVehicle(Vehicle *v);

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void DeleteVehicleChain(Vehicle *v);

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void *VehicleFromPos(TileIndex tile, void *data, VehicleFromPosProc *proc);

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void CallVehicleTicks(void);

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Vehicle *FindVehicleOnTileZ(TileIndex tile, byte z);

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void InitializeTrains(void);

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byte VehicleRandomBits(void);

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bool CanFillVehicle(Vehicle *v);

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bool CanRefitTo(EngineID engine_type, CargoID cid_to);

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CargoID FindFirstRefittableCargo(EngineID engine_type);

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void ViewportAddVehicles(DrawPixelInfo *dpi);

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void TrainEnterDepot(Vehicle *v, TileIndex tile);

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/* train_cmd.h */

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int GetTrainImage(const Vehicle* v, Direction direction);

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int GetAircraftImage(const Vehicle* v, Direction direction);

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int GetRoadVehImage(const Vehicle* v, Direction direction);

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int GetShipImage(const Vehicle* v, Direction direction);

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Vehicle *CreateEffectVehicle(int x, int y, int z, EffectVehicle type);

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Vehicle *CreateEffectVehicleAbove(int x, int y, int z, EffectVehicle type);

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Vehicle *CreateEffectVehicleRel(const Vehicle *v, int x, int y, int z, EffectVehicle type);

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uint32 VehicleEnterTile(Vehicle *v, TileIndex tile, int x, int y);

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StringID VehicleInTheWayErrMsg(const Vehicle* v);

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Vehicle *FindVehicleBetween(TileIndex from, TileIndex to, byte z);

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TileIndex GetVehicleOutOfTunnelTile(const Vehicle *v);

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bool UpdateSignalsOnSegment(TileIndex tile, DiagDirection direction);

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void SetSignalsOnBothDir(TileIndex tile, byte track);

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Vehicle *CheckClickOnVehicle(const ViewPort *vp, int x, int y);

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void DecreaseVehicleValue(Vehicle *v);

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void CheckVehicleBreakdown(Vehicle *v);

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void AgeVehicle(Vehicle *v);

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void VehicleEnteredDepotThisTick(Vehicle *v);

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void BeginVehicleMove(Vehicle *v);

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void EndVehicleMove(Vehicle *v);

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void ShowAircraftViewWindow(const Vehicle* v);

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UnitID GetFreeUnitNumber(byte type);

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int LoadUnloadVehicle(Vehicle *v);

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void TrainConsistChanged(Vehicle *v);

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void TrainPowerChanged(Vehicle *v);

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int32 GetTrainRunningCost(const Vehicle *v);

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int CheckTrainStoppedInDepot(const Vehicle *v);

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bool VehicleNeedsService(const Vehicle *v);

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typedef struct GetNewVehiclePosResult {

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	int x,y;

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	TileIndex old_tile;

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	TileIndex new_tile;

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} GetNewVehiclePosResult;

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/**

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 * Returns the Trackdir on which the vehicle is currently located.

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 * Works for trains and ships.

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 * Currently works only sortof for road vehicles, since they have a fuzzy

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 * concept of being "on" a trackdir. Dunno really what it returns for a road

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 * vehicle that is halfway a tile, never really understood that part. For road

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 * vehicles that are at the beginning or end of the tile, should just return

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 * the diagonal trackdir on which they are driving. I _think_.

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 * For other vehicles types, or vehicles with no clear trackdir (such as those

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 * in depots), returns 0xFF.

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 */

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Trackdir GetVehicleTrackdir(const Vehicle* v);

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/* returns true if staying in the same tile */

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bool GetNewVehiclePos(const Vehicle *v, GetNewVehiclePosResult *gp);

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Direction GetDirectionTowards(const Vehicle* v, int x, int y);

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#define BEGIN_ENUM_WAGONS(v) do {

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#define END_ENUM_WAGONS(v) } while ( (v=v->next) != NULL);

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extern MemoryPool _vehicle_pool;

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/**

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 * Get the pointer to the vehicle with index 'index'

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 */

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static inline Vehicle *GetVehicle(VehicleID index)

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{

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	return (Vehicle*)GetItemFromPool(&_vehicle_pool, index);

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}

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/**

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 * Get the current size of the VehiclePool

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 */

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static inline uint16 GetVehiclePoolSize(void)

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{

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	return _vehicle_pool.total_items;

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}

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/**

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 * Check if a Vehicle really exists.

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 */

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static inline bool IsValidVehicle(const Vehicle *v)

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{

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	return v->type != 0;

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}

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/**

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 * Check if an index is a vehicle-index (so between 0 and max-vehicles)

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 *

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 * @return Returns true if the vehicle-id is in range

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 */

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static inline bool IsVehicleIndex(uint index)

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{

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	return index < GetVehiclePoolSize();

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}

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/* Returns order 'index' of a vehicle or NULL when it doesn't exists */

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static inline Order *GetVehicleOrder(const Vehicle *v, int index)

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{

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	Order *order = v->orders;

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	if (index < 0) return NULL;

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	while (order != NULL && index-- > 0)

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		order = order->next;

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	return order;

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}

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/* Returns the last order of a vehicle, or NULL if it doesn't exists */

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static inline Order *GetLastVehicleOrder(const Vehicle *v)

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{

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	Order *order = v->orders;

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	if (order == NULL) return NULL;

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	while (order->next != NULL)

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		order = order->next;

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	return order;

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}

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/* Get the first vehicle of a shared-list, so we only have to walk forwards */

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static inline Vehicle *GetFirstVehicleFromSharedList(Vehicle *v)

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{

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	Vehicle *u = v;

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	while (u->prev_shared != NULL)

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		u = u->prev_shared;

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	return u;

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}

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// NOSAVE: Return values from various commands.

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VARDEF VehicleID _new_vehicle_id;

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VARDEF uint16 _returned_refit_capacity;

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#define INVALID_VEHICLE 0xFFFF

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/**

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 * Get the colour map for an engine. This used for unbuilt engines in the user interface.

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 * @param engine_type ID of engine

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 * @param player ID of player

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 * @return A ready-to-use palette modifier

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 */

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PalSpriteID GetEnginePalette(EngineID engine_type, PlayerID player);

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/**

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 * Get the colour map for a vehicle.

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 * @param v Vehicle to get colour map for

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 * @return A ready-to-use palette modifier

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 */

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PalSpriteID GetVehiclePalette(const Vehicle *v);

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/* A lot of code calls for the invalidation of the status bar, which is widget 5.

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 * Best is to have a virtual value for it when it needs to change again */

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#define STATUS_BAR 5

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#endif /* VEHICLE_H */