//************************************************************************//
//                                                                        //
//  Copyright 2013 Bertram Kopf (bertram@ep1.rub.de)                      //
//                 Julian Pychy (julian@ep1.rub.de)                       //
//                 - Ruhr-Universität Bochum                              //
//                                                                        //
//  This file is part of Pawian.                                          //
//                                                                        //
//  Pawian is free software: you can redistribute it and/or modify        //
//  it under the terms of the GNU General Public License as published by  //
//  the Free Software Foundation, either version 3 of the License, or     //
//  (at your option) any later version.                                   //
//                                                                        //
//  Pawian is distributed in the hope that it will be useful,             //
//  but WITHOUT ANY WARRANTY; without even the implied warranty of        //
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         //
//  GNU General Public License for more details.                          //
//                                                                        //
//  You should have received a copy of the GNU General Public License     //
//  along with Pawian.  If not, see <http://www.gnu.org/licenses/>.       //
//                                                                        //
//************************************************************************//

// PwaCovMatrix class definition file. -*- C++ -*-
// Copyright 2015 Bertram Kopf

#pragma once

#include <vector>
#include "Minuit2/MnUserParameters.h"

using namespace ROOT::Minuit2;
//class MnMachinePrecision;

class AbsPawianParameters {

public:

   AbsPawianParameters() {}

  //   AbsPawianParameters(const std::vector<double>&, const std::vector<double>&);

   ~AbsPawianParameters() {}

   // AbsPawianParameters(const AbsPawianParameters& par) : 
   //    fTransformation(par.fTransformation) {}

  virtual AbsPawianParameters& operator=(AbsPawianParameters& par)=0;
  virtual AbsPawianParameters* Clone()=0;

  virtual std::string type()=0;

  virtual const MnUserParameters& mnUserParameters() const=0;

  //  const MnUserTransformation& Trafo() const {return fTransformation;}

  virtual unsigned int VariableParameters() const=0;
  // {
   //    return fTransformation.VariableParameters();
   // }

   /// access to parameters (row-wise)
   // const std::vector<ROOT::Minuit2::MinuitParameter>& Parameters() const;
  virtual const std::vector<std::string> ParamNames()=0;

   /// access to parameters and errors in column-wise representation 
   virtual std::vector<double> Params() const=0;
   virtual std::vector<double> Errors() const=0;

   /// access to single Parameter
   // const MinuitParameter& Parameter(unsigned int) const;

   /// Add free Parameter Name, Value, Error
   virtual bool Add(const std::string &, double, double)=0;
   /// Add limited Parameter Name, Value, Lower bound, Upper bound
   virtual bool Add(const std::string &, double, double, double, double)=0;
   /// Add const Parameter Name, vale
   virtual bool Add(const std::string &, double)=0;

   /// interaction via external number of Parameter
   virtual void Fix(unsigned int)=0;
   virtual void Release(unsigned int)=0;
   virtual void SetValue(unsigned int, double)=0;
   virtual void SetError(unsigned int, double)=0;
   virtual void SetLimits(unsigned int, double, double)=0;
   virtual void SetUpperLimit(unsigned int, double)=0;
   virtual void SetLowerLimit(unsigned int, double)=0;
   virtual void RemoveLimits(unsigned int)=0;

   virtual double Value(unsigned int) const=0;
   virtual double Error(unsigned int) const=0;
  
   /// interaction via Name of Parameter
   virtual void Fix(const std::string &)=0;
   virtual void Release(const std::string &)=0;
   virtual void SetValue(const std::string &, double)=0;
   virtual void SetError(const std::string &, double)=0;
   virtual void SetLimits(const std::string &, double, double)=0;
   virtual void SetUpperLimit(const std::string &, double)=0;
   virtual void SetLowerLimit(const std::string &, double)=0;
   virtual void RemoveLimits(const std::string &)=0;

   virtual double Value(const std::string &) const=0;
   virtual double Error(const std::string &) const=0;

  /// interaction via external number of Parameter
  virtual bool IsFixed(unsigned int)=0;
  virtual bool HasLimits(unsigned int)=0;

  virtual double UpperLimit(unsigned int)=0;
  virtual double LowerLimit(unsigned int)=0; 
 
   //convert Name into external number of Parameter
   virtual unsigned int Index(const std::string &) const=0;
   //convert external number into Name of Parameter
   virtual const std::string & GetName(unsigned int) const=0;
   // mantain interface with const char * for backward compatibility
   virtual const char* Name(unsigned int) const=0;

   // const MnMachinePrecision& Precision() const;
  virtual void SetPrecision(double eps)=0;

private:

  //   MnUserTransformation fTransformation;
};