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/*
* 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 script_group.hpp Everything to put vehicles into groups. */
#ifndef SCRIPT_GROUP_HPP
#define SCRIPT_GROUP_HPP
#include "script_vehicle.hpp"
#include "../../group_type.h"
/**
* Class that handles all group related functions.
* @api ai
*/
class ScriptGroup : public ScriptObject {
public:
/**
* The group IDs of some special groups.
*/
enum GroupID {
/* Note: these values represent part of the in-game static values */
GROUP_ALL = ::ALL_GROUP, ///< All vehicles are in this group.
GROUP_DEFAULT = ::DEFAULT_GROUP, ///< Vehicles not put in any other group are in this one.
GROUP_INVALID = ::INVALID_GROUP, ///< An invalid group id.
};
/**
* Checks whether the given group is valid.
* @param group_id The group to check.
* @pre group_id != GROUP_DEFAULT && group_id != GROUP_ALL.
* @return True if and only if the group is valid.
*/
static bool IsValidGroup(GroupID group_id);
/**
* Create a new group.
* @param vehicle_type The type of vehicle to create a group for.
* @return The GroupID of the new group, or an invalid GroupID when
* it failed. Check the return value using IsValidGroup(). In test-mode
* 0 is returned if it was successful; any other value indicates failure.
*/
static GroupID CreateGroup(ScriptVehicle::VehicleType vehicle_type);
/**
* Delete the given group. When the deletion succeeds all vehicles in the
* given group will move to the GROUP_DEFAULT.
* @param group_id The group to delete.
* @pre IsValidGroup(group_id).
* @return True if and only if the group was successfully deleted.
*/
static bool DeleteGroup(GroupID group_id);
/**
* Get the vehicle type of a group.
* @param group_id The group to get the type from.
* @pre IsValidGroup(group_id).
* @return The vehicletype of the given group.
*/
static ScriptVehicle::VehicleType GetVehicleType(GroupID group_id);
/**
* Set the name of a group.
* @param group_id The group to set the name for.
* @param name The name for the group (can be either a raw string, or a ScriptText object).
* @pre IsValidGroup(group_id).
* @pre name != NULL && len(name) != 0
* @exception ScriptError::ERR_NAME_IS_NOT_UNIQUE
* @return True if and only if the name was changed.
*/
static bool SetName(GroupID group_id, Text *name);
/**
* Get the name of a group.
* @param group_id The group to get the name of.
* @pre IsValidGroup(group_id).
* @return The name the group has.
*/
static char *GetName(GroupID group_id);
/**
* Enable or disable autoreplace protected. If the protection is
* enabled, global autoreplace won't affect vehicles in this group.
* @param group_id The group to change the protection for.
* @param enable True if protection should be enabled.
* @pre IsValidGroup(group_id).
* @return True if and only if the protection was successfully changed.
*/
static bool EnableAutoReplaceProtection(GroupID group_id, bool enable);
/**
* Get the autoreplace protection status.
* @param group_id The group to get the protection status for.
* @pre IsValidGroup(group_id).
* @return The autoreplace protection status for the given group.
*/
static bool GetAutoReplaceProtection(GroupID group_id);
/**
* Get the number of engines in a given group.
* @param group_id The group to get the number of engines in.
* @param engine_id The engine id to count.
* @pre IsValidGroup(group_id) || group_id == GROUP_ALL || group_id == GROUP_DEFAULT.
* @return The number of engines with id engine_id in the group with id group_id.
*/
static int32 GetNumEngines(GroupID group_id, EngineID engine_id);
/**
* Move a vehicle to a group.
* @param group_id The group to move the vehicle to.
* @param vehicle_id The vehicle to move to the group.
* @pre IsValidGroup(group_id) || group_id == GROUP_DEFAULT.
* @pre ScriptVehicle::IsValidVehicle(vehicle_id).
* @return True if and only if the vehicle was successfully moved to the group.
* @note A vehicle can be in only one group at the same time. To remove it from
* a group, move it to another or to GROUP_DEFAULT. Moving the vehicle to the
* given group means removing it from another group.
*/
static bool MoveVehicle(GroupID group_id, VehicleID vehicle_id);
/**
* Enable or disable the removal of wagons when a (part of a) vehicle is
* (auto)replaced with a longer variant (longer wagons or longer engines)
* If enabled, wagons are removed from the end of the vehicle until it
* fits in the same number of tiles as it did before.
* @param keep_length If true, wagons will be removed if the new engine is longer.
* @return True if and only if the value was successfully changed.
*/
static bool EnableWagonRemoval(bool keep_length);
/**
* Get the current status of wagon removal.
* @return Whether or not wagon removal is enabled.
*/
static bool HasWagonRemoval();
/**
* Start replacing all vehicles with a specified engine with another engine.
* @param group_id The group to replace vehicles from. Use ALL_GROUP to replace
* vehicles from all groups that haven't set autoreplace protection.
* @param engine_id_old The engine id to start replacing.
* @param engine_id_new The engine id to replace with.
* @pre IsValidGroup(group_id) || group_id == GROUP_DEFAULT || group_id == GROUP_ALL.
* @pre ScriptEngine.IsBuildable(engine_id_new).
* @return True if and if the replacing was successfully started.
* @note To stop autoreplacing engine_id_old, call StopAutoReplace(group_id, engine_id_old).
*/
static bool SetAutoReplace(GroupID group_id, EngineID engine_id_old, EngineID engine_id_new);
/**
* Get the EngineID the given EngineID is replaced with.
* @param group_id The group to get the replacement from.
* @param engine_id The engine that is being replaced.
* @pre IsValidGroup(group_id) || group_id == GROUP_DEFAULT || group_id == GROUP_ALL.
* @return The EngineID that is replacing engine_id or an invalid EngineID
* in case engine_id is not begin replaced.
*/
static EngineID GetEngineReplacement(GroupID group_id, EngineID engine_id);
/**
* Stop replacing a certain engine in the specified group.
* @param group_id The group to stop replacing the engine in.
* @param engine_id The engine id to stop replacing with another engine.
* @pre IsValidGroup(group_id) || group_id == GROUP_DEFAULT || group_id == GROUP_ALL.
* @return True if and if the replacing was successfully stopped.
*/
static bool StopAutoReplace(GroupID group_id, EngineID engine_id);
};
#endif /* SCRIPT_GROUP_HPP */
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