/* $Id$ */

/** @file command.h */

#ifndef COMMAND_H
#define COMMAND_H

/**
 * List of commands.
 *
 * This enum defines all possible commands which can be executed to the game
 * engine. Observing the game like the query-tool or checking the profit of a
 * vehicle don't result in a command which should be executed in the engine
 * nor send to the server in a network game.
 *
 * @see _command_proc_table
 */
enum {
	CMD_BUILD_RAILROAD_TRACK         =   0, ///< build a rail track
	CMD_REMOVE_RAILROAD_TRACK        =   1, ///< remove a rail track
	CMD_BUILD_SINGLE_RAIL            =   2, ///< build a single rail track
	CMD_REMOVE_SINGLE_RAIL           =   3, ///< remove a single rail track
	CMD_LANDSCAPE_CLEAR              =   4, ///< demolish a tile
	CMD_BUILD_BRIDGE                 =   5, ///< build a bridge
	CMD_BUILD_RAILROAD_STATION       =   6, ///< build a railroad station
	CMD_BUILD_TRAIN_DEPOT            =   7, ///< build a train depot
	CMD_BUILD_SIGNALS                =   8, ///< build a signal
	CMD_REMOVE_SIGNALS               =   9, ///< remove a signal
	CMD_TERRAFORM_LAND               =  10, ///< terraform a tile
	CMD_PURCHASE_LAND_AREA           =  11, ///< purchase a tile
	CMD_SELL_LAND_AREA               =  12, ///< sell a bought tile before
	CMD_BUILD_TUNNEL                 =  13, ///< build a tunnel

	CMD_REMOVE_FROM_RAILROAD_STATION =  14, ///< remove a tile station
	CMD_CONVERT_RAIL                 =  15, ///< convert a rail type

	CMD_BUILD_TRAIN_WAYPOINT         =  16, ///< build a waypoint
	CMD_RENAME_WAYPOINT              =  17, ///< rename a waypoint
	CMD_REMOVE_TRAIN_WAYPOINT        =  18, ///< remove a waypoint

	CMD_BUILD_ROAD_STOP              =  21, ///< build a road stop
	CMD_REMOVE_ROAD_STOP             =  22, ///< remove a road stop
	CMD_BUILD_LONG_ROAD              =  23, ///< build a complete road (not a "half" one)
	CMD_REMOVE_LONG_ROAD             =  24, ///< remove a complete road (not a "half" one)
	CMD_BUILD_ROAD                   =  25, ///< build a "half" road
	CMD_REMOVE_ROAD                  =  26, ///< remove a "half" road
	CMD_BUILD_ROAD_DEPOT             =  27, ///< build a road depot

	CMD_BUILD_AIRPORT                =  29, ///< build an airport

	CMD_BUILD_DOCK                   =  30, ///< build a dock

	CMD_BUILD_SHIP_DEPOT             =  31, ///< build a ship depot
	CMD_BUILD_BUOY                   =  32, ///< build a buoy

	CMD_PLANT_TREE                   =  33, ///< plant a tree

	CMD_BUILD_RAIL_VEHICLE           =  34, ///< build a rail vehicle
	CMD_MOVE_RAIL_VEHICLE            =  35, ///< move a rail vehicle (in the depot)

	CMD_START_STOP_TRAIN             =  36, ///< start or stop a train

	CMD_SELL_RAIL_WAGON              =  38, ///< sell a rail wagon

	CMD_SEND_TRAIN_TO_DEPOT          =  39, ///< send a train to a depot
	CMD_FORCE_TRAIN_PROCEED          =  40, ///< proceed a train to pass a red signal
	CMD_REVERSE_TRAIN_DIRECTION      =  41, ///< turn a train around

	CMD_MODIFY_ORDER                 =  42, ///< modify an order (like set full-load)
	CMD_SKIP_TO_ORDER                =  43, ///< skip an order to the next of specific one
	CMD_DELETE_ORDER                 =  44, ///< delete an order
	CMD_INSERT_ORDER                 =  45, ///< insert a new order

	CMD_CHANGE_SERVICE_INT           =  46, ///< change the server interval of a vehicle

	CMD_BUILD_INDUSTRY               =  47, ///< build a new industry

	CMD_BUILD_COMPANY_HQ             =  48, ///< build the company headquarter
	CMD_SET_PLAYER_FACE              =  49, ///< set the face of the player/company
	CMD_SET_PLAYER_COLOR             =  50, ///< set the color of the player/company

	CMD_INCREASE_LOAN                =  51, ///< increase the loan from the bank
	CMD_DECREASE_LOAN                =  52, ///< decrease the loan from the bank

	CMD_WANT_ENGINE_PREVIEW          =  53, ///< confirm the preview of an engine

	CMD_NAME_VEHICLE                 =  54, ///< rename a whole vehicle
	CMD_RENAME_ENGINE                =  55, ///< rename a engine (in the engine list)
	CMD_CHANGE_COMPANY_NAME          =  56, ///< change the company name
	CMD_CHANGE_PRESIDENT_NAME        =  57, ///< change the president name
	CMD_RENAME_STATION               =  58, ///< rename a station

	CMD_SELL_AIRCRAFT                =  59, ///< sell an aircraft
	CMD_START_STOP_AIRCRAFT          =  60, ///< start/stop an aircraft
	CMD_BUILD_AIRCRAFT               =  61, ///< build an aircraft
	CMD_SEND_AIRCRAFT_TO_HANGAR      =  62, ///< send an aircraft to a hanger
	CMD_REFIT_AIRCRAFT               =  64, ///< refit the cargo space of an aircraft

	CMD_PLACE_SIGN                   =  65, ///< place a sign
	CMD_RENAME_SIGN                  =  66, ///< rename a sign

	CMD_BUILD_ROAD_VEH               =  67, ///< build a road vehicle
	CMD_START_STOP_ROADVEH           =  68, ///< start/stop a road vehicle
	CMD_SELL_ROAD_VEH                =  69, ///< sell a road vehicle
	CMD_SEND_ROADVEH_TO_DEPOT        =  70, ///< send a road vehicle to the depot
	CMD_TURN_ROADVEH                 =  71, ///< turn a road vehicle around
	CMD_REFIT_ROAD_VEH               =  72, ///< refit the cargo space of a road vehicle

	CMD_PAUSE                        =  73, ///< pause the game

	CMD_BUY_SHARE_IN_COMPANY         =  74, ///< buy a share from a company
	CMD_SELL_SHARE_IN_COMPANY        =  75, ///< sell a share from a company
	CMD_BUY_COMPANY                  =  76, ///< buy a company which is bankrupt

	CMD_BUILD_TOWN                   =  77, ///< build a town

	CMD_RENAME_TOWN                  =  80, ///< rename a town
	CMD_DO_TOWN_ACTION               =  81, ///< do a action from the town detail window (like advertises or bribe)

	CMD_SET_ROAD_DRIVE_SIDE          =  82, ///< set the side where the road vehicles drive

	CMD_CHANGE_DIFFICULTY_LEVEL      =  85, ///< change the difficult of a game (each setting for it own)

	CMD_START_STOP_SHIP              =  86, ///< start/stop a ship
	CMD_SELL_SHIP                    =  87, ///< sell a ship
	CMD_BUILD_SHIP                   =  88, ///< build a new ship
	CMD_SEND_SHIP_TO_DEPOT           =  89, ///< send a ship to a depot
	CMD_REFIT_SHIP                   =  91, ///< refit the cargo space of a ship

	CMD_ORDER_REFIT                  =  98, ///< change the refit informaction of an order (for "goto depot" )
	CMD_CLONE_ORDER                  =  99, ///< clone (and share) an order
	CMD_CLEAR_AREA                   = 100, ///< clear an area

	CMD_MONEY_CHEAT                  = 102, ///< do the money cheat
	CMD_BUILD_CANAL                  = 103, ///< build a canal

	CMD_PLAYER_CTRL                  = 104, ///< used in multiplayer to create a new player etc.
	CMD_LEVEL_LAND                   = 105, ///< level land

	CMD_REFIT_RAIL_VEHICLE           = 106, ///< refit the cargo space of a train
	CMD_RESTORE_ORDER_INDEX          = 107, ///< restore vehicle order-index and service interval
	CMD_BUILD_LOCK                   = 108, ///< build a lock

	CMD_BUILD_SIGNAL_TRACK           = 110, ///< add signals along a track (by dragging)
	CMD_REMOVE_SIGNAL_TRACK          = 111, ///< remove signals along a track (by dragging)

	CMD_GIVE_MONEY                   = 113, ///< give money to an other player
	CMD_CHANGE_PATCH_SETTING         = 114, ///< change a patch setting

	CMD_SET_AUTOREPLACE              = 115, ///< set an autoreplace entry

	CMD_CLONE_VEHICLE                = 116, ///< clone a vehicle
	CMD_MASS_START_STOP              = 117, ///< start/stop all vehicles (in a depot)
	CMD_DEPOT_SELL_ALL_VEHICLES      = 118, ///< sell all vehicles which are in a given depot
	CMD_DEPOT_MASS_AUTOREPLACE       = 119, ///< force the autoreplace to take action in a given depot

	CMD_CREATE_GROUP                 = 120, ///< create a new group
	CMD_DELETE_GROUP                 = 121, ///< delete a group
	CMD_RENAME_GROUP                 = 122, ///< rename a group
	CMD_ADD_VEHICLE_GROUP            = 123, ///< add a vehicle to a group
	CMD_ADD_SHARED_VEHICLE_GROUP     = 124, ///< add all other shared vehicles to a group which are missing
	CMD_REMOVE_ALL_VEHICLES_GROUP    = 125, ///< remove all vehicles from a group
	CMD_SET_GROUP_REPLACE_PROTECTION = 126, ///< set the autoreplace-protection for a group

	CMD_MOVE_ORDER                   = 127, ///< move an order
	CMD_CHANGE_TIMETABLE             = 128, ///< change the timetable for a vehicle
	CMD_SET_VEHICLE_ON_TIME          = 129, ///< set the vehicle on time feature (timetable)
	CMD_AUTOFILL_TIMETABLE           = 130, ///< autofill the timetable
};

/**
 * List of flags for a command.
 *
 * This enums defines some flags which can be used for the commands.
 */
enum {
	DC_EXEC            = 0x01, ///< execute the given command
	DC_AUTO            = 0x02, ///< don't allow building on structures
	DC_QUERY_COST      = 0x04, ///< query cost only,  don't build.
	DC_NO_WATER        = 0x08, ///< don't allow building on water
	DC_NO_RAIL_OVERLAP = 0x10, ///< don't allow overlap of rails (used in buildrail)
	DC_AI_BUILDING     = 0x20, ///< special building rules for AI
	DC_NO_TOWN_RATING  = 0x40, ///< town rating does not disallow you from building
	DC_FORCETEST       = 0x80, ///< force test too.
};

/**
 * Used to combine a StringID with the command.
 *
 * This macro can be used to add a StringID (the error message to show) on a command-id
 * (CMD_xxx). Use the binary or-operator "|" to combine the command with the result from
 * this macro.
 *
 * @param x The StringID to combine with a command-id
 */
#define CMD_MSG(x) ((x) << 16)

/**
 * Defines some flags.
 *
 * This enumeration defines some flags which are binary-or'ed on a command.
 */
enum {
	CMD_NO_WATER              = 0x0400, ///< dont build on water
	CMD_NETWORK_COMMAND       = 0x0800, ///< execute the command without sending it on the network
	CMD_NO_TEST_IF_IN_NETWORK = 0x1000, ///< When enabled, the command will bypass the no-DC_EXEC round if in network
	CMD_SHOW_NO_ERROR         = 0x2000, ///< do not show the error message
};

/**
 * Command flags for the command table _command_proc_table.
 *
 * This enumeration defines flags for the _command_proc_table.
 */
enum {
	CMD_SERVER  = 0x1, ///< the command can only be initiated by the server
	CMD_OFFLINE = 0x2, ///< the command cannot be executed in a multiplayer game; single-player only
	CMD_AUTO    = 0x4, ///< set the DC_AUTO flag on this command
};

/**
 * Defines the callback type for all command handler functions.
 *
 * This type defines the function header for all functions which handles a CMD_* command.
 * A command handler use the parameters to act according to the meaning of the command.
 * The tile parameter defines the tile to perform an action on.
 * The flag parameter is filled with flags from the DC_* enumeration. The parameters
 * p1 and p2 are filled with parameters for the command like "which road type", "which
 * order" or "direction". Each function should mentioned in there doxygen comments
 * the usage of these parameters.
 *
 * @param tile The tile to apply a command on
 * @param flags Flags for the command, from the DC_* enumeration
 * @param p1 Additional data for the command
 * @param p2 Additional data for the command
 * @return The CommandCost of the command, which can be succeeded or failed.
 */
typedef CommandCost CommandProc(TileIndex tile, uint32 flags, uint32 p1, uint32 p2);

/**
 * Define a command with the flags which belongs to it.
 *
 * This struct connect a command handler function with the flags created with
 * the #CMD_AUTO, #CMD_OFFLINE and #CMD_SERVER values.
 */
struct Command {
	CommandProc *proc;
	byte flags;
};

/**
 * Checks if a command failes.
 *
 * As you see the parameter is not a command but the return value of a command,
 * the CommandCost class. This function checks if the command executed by
 * the CommandProc function failed and returns true if it does.
 *
 * @param cost The return value of a CommandProc call
 * @return true if the command failes
 * @see CmdSucceded
 */
static inline bool CmdFailed(CommandCost cost) { return cost.Failed(); }

/**
 * Checks if a command succeeded.
 *
 * As #CmdFailed this function checks if a command succeeded
 *
 * @param cost The return value of a CommandProc call
 * @return true if the command succeeded
 * @see CmdSucceeded
 */
static inline bool CmdSucceeded(CommandCost cost) { return cost.Succeeded(); }

/**
 * Define a default return value for a failed command.
 *
 * This variable contains a CommandCost object with is declared as "failed".
 * Other functions just need to return this error if there is an error,
 * which doesn't need to specific by a StringID.
 */
static const CommandCost CMD_ERROR = CommandCost(INVALID_STRING_ID);

/**
 * Returns from a function with a specific StringID as error.
 *
 * This macro is used to return from a function. The parameter contains the
 * StringID which will be returned.
 *
 * @param errcode The StringID to return
 */
#define return_cmd_error(errcode) return CommandCost(errcode);

/* command.cpp */
/**
 * Define a callback function for the client, after the command is finished.
 *
 * Functions of this type are called after the command is finished. The parameters
 * are from the #CommandProc callback type. The boolean parameter indicates if the
 * command succeeded or failed.
 *
 * @param success If the command succeeded or not.
 * @param tile The tile of the command action
 * @param p1 Additional data of the command
 * @param p1 Additional data of the command
 * @see CommandProc
 */
typedef void CommandCallback(bool success, TileIndex tile, uint32 p1, uint32 p2);

/**
 * Execute a command
 */
CommandCost DoCommand(TileIndex tile, uint32 p1, uint32 p2, uint32 flags, uint procc);

/**
 * Execute a network safe DoCommand function
 */
bool DoCommandP(TileIndex tile, uint32 p1, uint32 p2, CommandCallback *callback, uint32 cmd, bool my_cmd = true);

#ifdef ENABLE_NETWORK

/**
 * Send a command over the network
 */
void NetworkSend_Command(TileIndex tile, uint32 p1, uint32 p2, uint32 cmd, CommandCallback *callback);
#endif /* ENABLE_NETWORK */

/**
 * Text, which gets sent with a command
 *
 * This variable contains a string (be specific a pointer of the first
 * char of this string) which will be send with a command. This is
 * used for user input data like names or chat messages.
 */
extern const char *_cmd_text;

/**
 * Checks if a integer value belongs to a command.
 */
bool IsValidCommand(uint cmd);
/**
 * Returns the flags from a given command.
 */
byte GetCommandFlags(uint cmd);
/**
 * Returns the current money available which can be used for a command.
 */
Money GetAvailableMoneyForCommand();

#endif /* COMMAND_H */