/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/
 
/*
$Log$
Revision 1.1  2002/01/30 22:20:22  nilsen
New TTask based method to do Digits To clusters. Works with files of multiple
events in the file. Macro added to show how to use. Also the changes made
in the nessesary complilation files.

*/
#include <TROOT.h>
#include <TFile.h>
#include <TSeqCollection.h>
#include <TString.h>
#include <TClonesArray.h>

#include "AliRun.h"

#include "AliITS.h"
#include "AliITSDetType.h"
#include "AliITSreconstruction.h"
#include "AliITSsegmentationSPD.h"
#include "AliITSsegmentationSDD.h"
#include "AliITSsegmentationSSD.h"
#include "AliITSClusterFinderSPD.h"
#include "AliITSClusterFinderSDD.h"
#include "AliITSClusterFinderSSD.h"
#include "AliITSresponseSDD.h"
#include "AliITSgeom.h"

ClassImp(AliITSreconstruction)

//______________________________________________________________________
AliITSreconstruction::AliITSreconstruction(){
    // Default constructor.
    // Inputs:
    //  none.
    // Outputs:
    //   none.
    // Return:
    //    A zero-ed constructed AliITSreconstruction class.

    fFilename = "";
    fFile     = 0;
    fITS      = 0;
    fDet[0] = fDet[1] = fDet[2] = kTRUE;
    fInit     = kFALSE;
}
//______________________________________________________________________
AliITSreconstruction::AliITSreconstruction(const char* filename){
    // Standard constructor.
    // Inputs:
    //  const char* filename    filename containing the digits to be
    //                          reconstructed. If filename = 0 (nil)
    //                          then no file is opened but a file is
    //                          assumed to already be opened. This 
    //                          already opened file will be used.
    // Outputs:
    //   none.
    // Return:
    //    A standardly constructed AliITSreconstruction class.

    fFilename = filename;

    if(filename){
	fFile = (TFile*)gROOT->GetListOfFiles()->FindObject(fFilename.Data());
	if(fFile) fFile->Close();
	fFile = new TFile(fFilename.Data(),"UPDATE");
	//
	if(gAlice) delete gAlice;
	gAlice = (AliRun*)fFile->Get("gAlice");
	if(!gAlice) {
	    cout << "gAlice not found on file. Aborting." << endl;
	    fInit = kFALSE;
	    return;
	} // end if !gAlice
    } // end if !filename.

    Init();
}
//______________________________________________________________________
AliITSreconstruction::~AliITSreconstruction(){
    // Default constructor.
    // Inputs:
    //  none.
    // Outputs:
    //   none.
    // Return:
    //    A destroyed AliITSreconstruction class.

    if(fFile) fFile->Close();
    fFile     = 0;
    fITS      = 0;
    
}
//______________________________________________________________________
Bool_t AliITSreconstruction::Init(){
    // Class Initilizer.
    // Inputs:
    //  none.
    // Outputs:
    //   none.
    // Return:
    //    kTRUE if no errors initilizing this class occurse else kFALSE
    Int_t nparticles;

    fITS = (AliITS*) gAlice->GetDetector("ITS");
    if(!fITS){
	cout << "ITS not found aborting. fITS=" << fITS << endl;
	fInit = kFALSE;
	return fInit;
    } // end if !fITS
    if(!(fITS->GetITSgeom())){
	cout << "ITSgeom not found aborting."<< endl;
	fInit = kFALSE;
	return fInit;
    } // end if !GetITSgeom()
    // Now ready to init.

    fDet[0] = fDet[1] = fDet[2] = kTRUE;
    fEnt0 = 0;
    fEnt  = gAlice->GetEventsPerRun();
    fITS->MakeTreeC();
    nparticles = gAlice->GetEvent(fEnt0);
    
    // finished init.
    fInit = InitRec();
    return fInit;
}
//______________________________________________________________________
Bool_t AliITSreconstruction::InitRec(){
    // Sets up Reconstruction part of AliITSDetType..
    // Inputs:
    //      none.
    // Outputs:
    //      none.
    // Return:
    //      none.
    AliITSDetType *idt;

    // SPD
    if(fDet[kSPD]){
	idt = fITS->DetType(kSPD);
	AliITSsegmentationSPD *segSPD = (AliITSsegmentationSPD*)
	                                       idt->GetSegmentationModel();
	TClonesArray *digSPD = fITS->DigitsAddress(kSPD);
	TClonesArray *recpSPD = fITS->ClustersAddress(kSPD);
	AliITSClusterFinderSPD *recSPD = new AliITSClusterFinderSPD(segSPD,
								    digSPD,
								    recpSPD);
	fITS->SetReconstructionModel(kSPD,recSPD);
    } // end if fDet[kSPD].
    // SDD
    if(fDet[kSDD]){
	idt = fITS->DetType(kSDD);
	AliITSsegmentationSDD *segSDD = (AliITSsegmentationSDD*)
	                                   idt->GetSegmentationModel();
	AliITSresponseSDD *resSDD = (AliITSresponseSDD*)
	                                   idt->GetResponseModel();
	TClonesArray *digSDD = fITS->DigitsAddress(kSDD);
	TClonesArray *recpSDD = fITS->ClustersAddress(kSDD);
	AliITSClusterFinderSDD *recSDD =new AliITSClusterFinderSDD(segSDD,
								   resSDD,
							       digSDD,recpSDD);
	fITS->SetReconstructionModel(kSDD,recSDD);
    } // end if fDet[kSDD]
    // SSD
    if(fDet[kSSD]){
	idt = fITS->DetType(kSSD);
	AliITSsegmentationSSD *segSSD = (AliITSsegmentationSSD*)
	                                 idt->GetSegmentationModel();
	TClonesArray *digSSD = fITS->DigitsAddress(kSSD);
	AliITSClusterFinderSSD *recSSD =new AliITSClusterFinderSSD(segSSD,
								   digSSD);
	fITS->SetReconstructionModel(kSSD,recSSD);
    } // end if fDet[kSSD]

    return kTRUE;
}
//______________________________________________________________________ 
void AliITSreconstruction::Exec(const Option_t *opt){
    // Main reconstruction function.
    // Inputs:
    //      Option_t * opt   list of subdetector to digitize. =0 all.
    // Outputs:
    //      none.
    // Return:
    //      none.
    Option_t *lopt;
    Int_t nparticles,evnt;

    if(strstr(opt,"All")||strstr(opt,"ALL")||strstr(opt,"ITS")||opt==0){
	fDet[0] = fDet[1] = fDet[2] = kTRUE;
	lopt = "All";
    }else{
	fDet[0] = fDet[1] = fDet[2] = kFALSE;
	if(strstr(opt,"SPD")) fDet[kSPD] = kTRUE;
	if(strstr(opt,"SDD")) fDet[kSDD] = kTRUE;
	if(strstr(opt,"SSD")) fDet[kSSD] = kTRUE;
	if(fDet[kSPD] && fDet[kSDD] && fDet[kSSD]) lopt = "All";
	else lopt = opt;
    } // end if strstr(opt,...)

    if(!fInit){
	cout << "Initilization Failed, Can't run Exec." << endl;
	return;
    } // end if !fInit
    for(evnt=0;evnt<fEnt;evnt++){
	nparticles = gAlice->GetEvent(evnt);
	gAlice->SetEvent(evnt);
	if(!gAlice->TreeR()) gAlice->MakeTree("R");
	fITS->MakeBranch("R");
	fITS->DigitsToRecPoints(evnt,0,lopt);
    } // end for evnt
}