// $Id$
//-----------------------------------------------------------------------
//       The GSI Online Offline Object Oriented (Go4) Project
//         Experiment Data Processing at EE department, GSI
//-----------------------------------------------------------------------
// Copyright (C) 2000- GSI Helmholtzzentrum fuer Schwerionenforschung GmbH
//                     Planckstr. 1, 64291 Darmstadt, Germany
// Contact:            http://go4.gsi.de
//-----------------------------------------------------------------------
// This software can be used under the license agreements as stated
// in Go4License.txt file which is part of the distribution.
//-----------------------------------------------------------------------

#include "TGo4FitDependency.h"

#include <iostream>

#include "TFormula.h"

TGo4FitDependency::TGo4FitDependency() :
    TObject(), fxParameter(), fxExpression(), fdInitValue(0.), fiNumPar(0), fxFormula(nullptr)  {
}


TGo4FitDependency::TGo4FitDependency(const char *iParameter, const char *iExpression) :
    TObject(), fxParameter(iParameter), fxExpression(iExpression), fdInitValue(0.), fiNumPar(0), fxFormula(nullptr) {
}

TGo4FitDependency::TGo4FitDependency(const char *iParameter, Double_t InitValue) :
    TObject(), fxParameter(iParameter), fxExpression(), fdInitValue(InitValue), fiNumPar(0), fxFormula(nullptr) {
}

TGo4FitDependency::~TGo4FitDependency() {
    if (fxFormula) delete fxFormula;
}

void TGo4FitDependency::SetParameter(const char *iParameter) {
  fxParameter = iParameter;
}

void TGo4FitDependency::SetInitValue(Double_t InitValue)
{
  fxExpression.Remove(0);
  fdInitValue = InitValue;

}
void TGo4FitDependency::SetExpression(const char *iExpression)
{
  fxExpression = iExpression;
}

void TGo4FitDependency::Initialize(Int_t iNumPar, const char *iFormula)
{
    fiNumPar = iNumPar;
    if (iFormula) {
       if (fxFormula) delete fxFormula;
       fxFormula = new TFormula("", iFormula);
    } else {
       fxFormula = nullptr;
    }
}

Double_t TGo4FitDependency::ExecuteDependency(Double_t *Params)
{
    Double_t res = fxFormula ? fxFormula->EvalPar(nullptr,Params) : fdInitValue;
    if (fiNumPar >= 0) Params[fiNumPar] = res;
    return res;
}

void TGo4FitDependency::Finalize()
{
   if (fxFormula) {
      delete fxFormula;
      fxFormula = nullptr;
   }
}

void TGo4FitDependency::Print(Option_t *option) const
{
   std::cout << "Pars dependency:   " << fxParameter << "  =  ";
   if (fxExpression.Length()>0) std::cout << fxExpression << std::endl;
                           else std::cout << fdInitValue << std::endl;
}