// $Id$
//
//    File: DReaction_factory_ee_convert.cc
// Created: Wed Jun 14 06:17:54 EDT 2017
// Creator: jrsteven (on Linux ifarm1402.jlab.org 3.10.0-327.el7.x86_64 x86_64)
//


#include "DReaction_factory_ee_convert.h"

//------------------
// brun
//------------------
jerror_t DReaction_factory_ee_convert::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_ee_convert::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

	/************************************************** ee_convert Reaction Definition *************************************************/

	locReaction = new DReaction("ee_convert");

	//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

	//Example: conversion e+e- pair
	locReactionStep = new DReactionStep();
	locReactionStep->Set_InitialParticleID(Gamma);
	locReactionStep->Set_TargetParticleID(Proton);
	locReactionStep->Add_FinalParticleID(Electron);
	locReactionStep->Add_FinalParticleID(Positron);
	locReactionStep->Add_FinalParticleID(Unknown, true); //true: proton missing
	locReaction->Add_ReactionStep(locReactionStep);
	dReactionStepPool.push_back(locReactionStep); //register so will be deleted later: prevent memory leak

	/**************************************************** ee_convert Control Settings ****************************************************/

	// 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_VertexFit);

	// Highly Recommended: When generating particle combinations, reject all beam photons that match to a different RF bunch
	locReaction->Set_MaxPhotonRFDeltaT(0.5*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(4);

	// 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_ee_convert.root", false); //true/false: do/don't save unused hypotheses

	/**************************************************** ee_convert 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, 2.0, Positron, SYS_TOF));
	locReaction->Add_AnalysisAction(new DCutAction_PIDDeltaT(locReaction, false, 2.0, Electron, SYS_TOF));
	locReaction->Add_AnalysisAction(new DCutAction_PIDDeltaT(locReaction, false, 2.0, Positron, SYS_BCAL));
	locReaction->Add_AnalysisAction(new DCutAction_PIDDeltaT(locReaction, false, 2.0, Electron, SYS_BCAL));

	// 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, 0.01)); //10% confidence level cut 

	// Custom action for conversion selection
	locReaction->Add_AnalysisAction(new DCustomAction_ee_convert_cuts(locReaction, true));

	// PID after conversion selection
	locReaction->Add_AnalysisAction(new DHistogramAction_PID(locReaction, "AfterConversionCuts"));

	// Kinematics
	locReaction->Add_AnalysisAction(new DHistogramAction_ParticleComboKinematics(locReaction, false)); //false: measured data
	locReaction->Add_AnalysisAction(new DHistogramAction_ParticleComboKinematics(locReaction, true, "KinFit")); //true: kinematic-fit 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_ee_convert::fini(void)
{
	for(size_t loc_i = 0; loc_i < dReactionStepPool.size(); ++loc_i)
		delete dReactionStepPool[loc_i]; //cleanup memory
	return NOERROR;
}