// $Id$
//
//    File: DReaction_factory_p2pi.cc
// Created: Wed Jan 21 16:28:09 EST 2015
// Creator: jrsteven (on Linux ifarm1401 2.6.32-431.el6.x86_64 x86_64)
//


#include "DReaction_factory_p2pi.h"

//------------------
// init
//------------------
jerror_t DReaction_factory_p2pi::init(void)
{
	// Make as many DReaction objects as desired
	DReactionStep* locReactionStep = NULL;
	DReaction* locReaction = new DReaction("p2pi"); //needs to be a unique name for each DReaction object, CANNOT (!) be "Thrown"

	/**************************************************** p2pi Reaction Steps ****************************************************/

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

	/**************************************************** p2pi 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/DKinFitResults.h
	locReaction->Set_KinFitType(d_P4AndVertexFit); //simultaneously constrain apply four-momentum conservation, invariant masses, and common-vertex constraints

	// Recommended: Enable ROOT TTree output for this DReaction
        locReaction->Enable_TTreeOutput("tree_p2pi.root"); //string is file name (must end in ".root"!!): doen't need to be unique, feel free to change

	/**************************************************** p2pi Analysis Actions ****************************************************/

	// Match reco to truth particles (only for MC!)
	//locReaction->Add_AnalysisAction(new DCutAction_TrueCombo(locReaction, 0.0, true));

	// Mock up of FCAL trigger
	//locReaction->Add_AnalysisAction(new DCustomAction_fcalTrigger(locReaction, false));

	// POCA cut on all tracks
	locReaction->Add_AnalysisAction(new DCutAction_AllVertexZ(locReaction, 50., 80.));

	// PID (not very useful currently)
	locReaction->Add_AnalysisAction(new DHistogramAction_PID(locReaction));

	// Custom cut on tagger/SC timing coincidence (2 ns gate currently)
	locReaction->Add_AnalysisAction(new DCustomAction_taggerCoincidence(locReaction, false, 2.));

	// Kinematic Fit Results
	locReaction->Add_AnalysisAction(new DHistogramAction_KinFitResults(locReaction, 0.05));

	// Custom histograms for p2pi (no KinFit cut)
	locReaction->Add_AnalysisAction(new DCustomAction_p2pi_hists(locReaction, false, "Measured"));
	locReaction->Add_AnalysisAction(new DCustomAction_p2pi_hists(locReaction, true, "KinFit"));

	// Require KinFit converges
	locReaction->Add_AnalysisAction(new DCutAction_KinFitFOM(locReaction, 0.0));

	// Custom histograms for p2pi (after KinFit convergence)
	locReaction->Add_AnalysisAction(new DCustomAction_p2pi_hists(locReaction, false, "Converge_Measured"));
	locReaction->Add_AnalysisAction(new DCustomAction_p2pi_hists(locReaction, true, "Converge_KinFit"));

	 // Require KinFit FOM > 0.1
	locReaction->Add_AnalysisAction(new DCutAction_KinFitFOM(locReaction, 0.1));

	// Custom histograms for p2pi (after KinFit FOM > 10%)
	locReaction->Add_AnalysisAction(new DCustomAction_p2pi_hists(locReaction, false, "Cut10_Measured"));
	locReaction->Add_AnalysisAction(new DCustomAction_p2pi_hists(locReaction, true, "Cut10_KinFit"));
	
	// Kinematics of final selection
	locReaction->Add_AnalysisAction(new DHistogramAction_ParticleComboKinematics(locReaction, false)); 
	locReaction->Add_AnalysisAction(new DHistogramAction_ParticleComboKinematics(locReaction, true, "KinFit"));
	locReaction->Add_AnalysisAction(new DHistogramAction_TrackVertexComparison(locReaction));

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

	return NOERROR;
}

//------------------
// fini
//------------------
jerror_t DReaction_factory_p2pi::fini(void)
{
	for(size_t loc_i = 0; loc_i < dReactionStepPool.size(); ++loc_i)
		delete dReactionStepPool[loc_i]; //cleanup memory
	return NOERROR;
}