// Copyright 2019-2020 CERN and copyright holders of ALICE O2.

// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.

// All rights not expressly granted are reserved.

//

// This software is distributed under the terms of the GNU General Public

// License v3 (GPL Version 3), copied verbatim in the file "COPYING".

//

// In applying this license CERN does not waive the privileges and immunities

// granted to it by virtue of its status as an Intergovernmental Organization

// or submit itself to any jurisdiction.

/// \author R+Preghenella - January 2020

#ifndef ALICEO2_EVENTGEN_GENERATORHEPMCPARAM_H_

#define ALICEO2_EVENTGEN_GENERATORHEPMCPARAM_H_

#include "CommonUtils/ConfigurableParam.h"

#include "CommonUtils/ConfigurableParamHelper.h"

#include <string>

namespace o2

{

namespace eventgen

{

/**

** a parameter class/struct to keep the settings of

** the HepMC event generator and

** allow the user to modify them

**/

struct GeneratorHepMCParam : public o2::conf::ConfigurableParamHelper<GeneratorHepMCParam> {

/** Version number of event structure to decode. Note, when reading

* from a file, this key is ignored. The interface will figure out

* the version automatically. When reading from a pipe, and the

* command line writes HepMC version 2 format, then this parameter

* should be set to 2 */

int version = 0;

/** Number of events to skip at the start of the input */

uint64_t eventsToSkip = 0;

/** Deprecated. Set the name of the file to read from. Use

* GeneratorFileOrCmd.fileNames instead. */

std::string fileName = "";

/** Wether to prune the event tree. If true, then only particles that are

*

* - beam particles (status == 4)

* - decayed (status == 2), or

* - final state (status == 1)

*

* are kept. This reduces the event size. How much depends on the

* event generator producing the event. Use with caution, as it may

* corrupt the event record. */

bool prune = false;

O2ParamDef(GeneratorHepMCParam, "HepMC");

};

} // end namespace eventgen

} // end namespace o2

#endif // ALICEO2_EVENTGEN_GENERATORHEPMCPARAM_H_