// $Id$
//
//    File: DReaction_factory_npi_missing.cc
// Created: Thu Dec 15 11:20:40 EST 2016
// Creator: jrsteven (on Linux ifarm1401 2.6.32-431.el6.x86_64 x86_64)
//


#include "DReaction_factory_npi_missing.h"

//------------------
// brun
//------------------
jerror_t DReaction_factory_npi_missing::brun(JEventLoop* locEventLoop, int32_t locRunNumber)
{
	vector<double> locBeamPeriodVector;
	locEventLoop->GetCalib("PHOTON_BEAM/RF/beam_period", locBeamPeriodVector);
	dBeamBunchPeriod = locBeamPeriodVector[0];

	return NOERROR;
}

//------------------
// evnt
//------------------
jerror_t DReaction_factory_npi_missing::evnt(JEventLoop* locEventLoop, uint64_t locEventNumber)
{
	// Make as many DReaction objects as desired
	DReactionStep* locReactionStep = NULL;
	DReaction* locReaction = NULL; //create with a unique name for each DReaction object. CANNOT (!) be "Thrown"

	// DOCUMENTATION:
	// ANALYSIS library: https://halldweb1.jlab.org/wiki/index.php/GlueX_Analysis_Software
	// DReaction factory: https://halldweb1.jlab.org/wiki/index.php/Analysis_DReaction

	/************************************************** npi_missing Reaction Definition *************************************************/

	locReaction = new DReaction("npi_missing");

	//Required: DReactionSteps to specify the channel and decay chain you want to study
		//Particles are of type Particle_t, an enum defined in sim-recon/src/libraries/include/particleType.h

	// g, p -> pi+, (n)
	locReactionStep = new DReactionStep();
	locReactionStep->Set_InitialParticleID(Gamma);
	locReactionStep->Set_TargetParticleID(Proton);
	locReactionStep->Add_FinalParticleID(PiPlus);
	locReactionStep->Add_FinalParticleID(Neutron, true); //true: proton missing
	locReaction->Add_ReactionStep(locReactionStep);
	dReactionStepPool.push_back(locReactionStep); //register so will be deleted later: prevent memory leak

	/**************************************************** npi_missing Control Settings ****************************************************/

	// Highly Recommended: Set EventStore skim query (use with "eventstore" source)
		// This will skip creating particle combos for events that aren't in the skims you list
		// Query should be comma-separated list of skims to boolean-AND together
	//locReaction->Set_EventStoreSkims("myskim1,myskim2,myskim3"); //boolean-AND of skims

	// Recommended: Type of kinematic fit to perform (default is d_NoFit)
		//fit types are of type DKinFitType, an enum defined in sim-recon/src/libraries/ANALYSIS/DReaction.h
		//Options: d_NoFit (default), d_P4Fit, d_VertexFit, d_P4AndVertexFit
		//P4 fits automatically constrain decaying particle masses, unless they are manually disabled
	locReaction->Set_KinFitType(d_NoFit);

	// Highly Recommended: When generating particle combinations, reject all beam photons that match to a different RF bunch
	locReaction->Set_MaxPhotonRFDeltaT(2.5*dBeamBunchPeriod); //should be minimum cut value

	// Highly Recommended: Cut on number of extra "good" tracks. "Good" tracks are ones that survive the "PreSelect" (or user custom) factory.
		// Important: Keep cut large: Can have many ghost and accidental tracks that look "good"
	locReaction->Set_MaxExtraGoodTracks(0);

	// Highly Recommended: Enable ROOT TTree output for this DReaction
	// string is file name (must end in ".root"!!): doen't need to be unique, feel free to change
	locReaction->Enable_TTreeOutput("tree_npi_missing.root", true); //true/false: do/don't save unused hypotheses

	/************************************************** npi_missing Pre-Combo Custom Cuts *************************************************/

	// Highly Recommended: Very loose DAnalysisAction cuts, applied just after creating the combination (before saving it)
	// Example: Missing mass of proton
	locReaction->Add_ComboPreSelectionAction(new DCutAction_MissingMass(locReaction, false, 0.3, 3.0));

	/**************************************************** npi_missing Analysis Actions ****************************************************/

	// Recommended: Analysis actions automatically performed by the DAnalysisResults factories to histogram useful quantities.
		//These actions are executed sequentially, and are executed on each surviving (non-cut) particle combination 
		//Pre-defined actions can be found in ANALYSIS/DHistogramActions_*.h and ANALYSIS/DCutActions.h
		//If a histogram action is repeated, it should be created with a unique name (string) to distinguish them

	// HISTOGRAM PID
	locReaction->Add_AnalysisAction(new DHistogramAction_PID(locReaction));

	// CUT PID
	locReaction->Add_AnalysisAction(new DCutAction_PIDDeltaT(locReaction, false, 1.0, PiPlus, SYS_TOF)); //cut at delta-t +/- 1.0 //false: measured data
	locReaction->Add_AnalysisAction(new DCutAction_PIDDeltaT(locReaction, false, 2.0, PiPlus, SYS_BCAL)); //cut at delta-t +/- 1.0 //false: measured data
	locReaction->Add_AnalysisAction(new DCutAction_PIDDeltaT(locReaction, false, 2.0, PiPlus, SYS_FCAL)); //cut at delta-t +/- 1.0 //false: measured data

	// HISTOGRAM MASSES //false/true: measured/kinfit data
	locReaction->Add_AnalysisAction(new DHistogramAction_MissingMass(locReaction, false, 1000, 0.3, 3.0, "PreKinFit"));

	// KINEMATIC FIT
	locReaction->Add_AnalysisAction(new DHistogramAction_KinFitResults(locReaction, 0.05)); //5% confidence level cut on pull histograms only
	//locReaction->Add_AnalysisAction(new DCutAction_KinFitFOM(locReaction, -1.0)); //0% confidence level cut //require kinematic fit converges

	// Custom cut action
	locReaction->Add_AnalysisAction(new DCustomAction_NeutronCuts(locReaction,false, 30., "NeutronCuts"));

	// HISTOGRAM MASSES //false/true: measured/kinfit data
	locReaction->Add_AnalysisAction(new DHistogramAction_MissingMass(locReaction, false, 1000, 0.3, 3.0, "PostKinFit"));

	// Kinematics
	locReaction->Add_AnalysisAction(new DHistogramAction_ParticleComboKinematics(locReaction, false)); //false: measured data
	locReaction->Add_AnalysisAction(new DHistogramAction_TrackVertexComparison(locReaction));

	_data.push_back(locReaction); //Register the DReaction with the factory

	return NOERROR;
}

//------------------
// fini
//------------------
jerror_t DReaction_factory_npi_missing::fini(void)
{
	for(size_t loc_i = 0; loc_i < dReactionStepPool.size(); ++loc_i)
		delete dReactionStepPool[loc_i]; //cleanup memory
	return NOERROR;
}