#ifndef _utl_ExponentialFitData_h_
#define _utl_ExponentialFitData_h_

#include <cmath>

#include <utl/ExponentialFitter-fwd.h>


namespace utl {

  class ExponentialFitData {
  public:
    ExponentialFitData() :
      fStart(0),
      fStop(0),
      fAmplitude(0), fAmplitudeError(0),
      fSlope(0), fSlopeError(0),
      fOffset(0),
      fChi2(0), fNdof(0)
    { }

    double GetStart() const { return fStart; }
    double GetStop() const { return fStop; }
    double GetAmplitude() const { return fAmplitude; }
    double GetAmplitudeError() const { return fAmplitudeError; }
    double GetSlope() const { return fSlope; }
    double GetSlopeError() const { return fSlopeError; }
    double GetOffset() const { return fOffset; }
    double GetChi2() const { return fChi2; }
    int GetNdof() const { return fNdof; }

    double operator()(const double x) const
    { return fAmplitude * std::exp(fSlope*x); }

    void SetStart(const double start) { fStart = start; }
    void SetStop(const double stop) { fStop = stop; }
    void SetAmplitude(const double amp, const double ampErr)
    { fAmplitude = amp; fAmplitudeError = ampErr; }
    void SetSlope(const double slope, const double slopeErr)
    { fSlope = slope; fSlopeError = slopeErr; }
    void SetOffset(const double offset)
    { fOffset = offset; }
    void SetChi2Ndof(const double chi2, const int ndof)
    { fChi2 = chi2; fNdof = ndof; }

  private:
    double fStart;
    double fStop;
    double fAmplitude;
    double fAmplitudeError;
    double fSlope;
    double fSlopeError;
    double fOffset;
    double fChi2;
    int fNdof;

    template<class Histogram>
    friend class utl::ExponentialFitter;
  };

}

#endif