// Created on: 1991-12-02
// Created by: Laurent PAINNOT
// Copyright (c) 1991-1999 Matra Datavision
// Copyright (c) 1999-2014 OPEN CASCADE SAS
//
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.

#ifndef _AppDef_ParFunctionOfTheGradient_HeaderFile
#define _AppDef_ParFunctionOfTheGradient_HeaderFile

#include <Standard.hxx>
#include <Standard_DefineAlloc.hxx>
#include <Standard_Handle.hxx>

#include <AppDef_MultiLine.hxx>
#include <Standard_Integer.hxx>
#include <Standard_Real.hxx>
#include <AppDef_ParLeastSquareOfTheGradient.hxx>
#include <NCollection_Array1.hxx>
#include <NCollection_HArray1.hxx>
#include <AppParCurves_ConstraintCouple.hxx>
#include <math_MultipleVarFunctionWithGradient.hxx>
#include <AppParCurves_Constraint.hxx>
class AppDef_MultiLine;
class AppDef_MyLineTool;
class AppDef_ParLeastSquareOfTheGradient;
class AppDef_ResConstraintOfTheGradient;
class AppParCurves_MultiCurve;

class AppDef_ParFunctionOfTheGradient : public math_MultipleVarFunctionWithGradient
{
public:
  DEFINE_STANDARD_ALLOC

  //! initializes the fields of the function. The approximating
  //! curve has the desired degree Deg.
  Standard_EXPORT AppDef_ParFunctionOfTheGradient(
    const AppDef_MultiLine&                                                SSP,
    const int                                                              FirstPoint,
    const int                                                              LastPoint,
    const occ::handle<NCollection_HArray1<AppParCurves_ConstraintCouple>>& TheConstraints,
    const math_Vector&                                                     Parameters,
    const int                                                              Deg);

  //! returns the number of variables of the function. It
  //! corresponds to the number of MultiPoints.
  Standard_EXPORT int NbVariables() const override;

  //! this method computes the new approximation of the
  //! MultiLine
  //! SSP and calculates F = sum (||Pui - Bi*Pi||2) for each
  //! point of the MultiLine.
  Standard_EXPORT bool Value(const math_Vector& X, double& F) override;

  //! returns the gradient G of the sum above for the
  //! parameters Xi.
  Standard_EXPORT bool Gradient(const math_Vector& X, math_Vector& G) override;

  //! returns the value F=sum(||Pui - Bi*Pi||)2.
  //! returns the value G = grad(F) for the parameters Xi.
  Standard_EXPORT bool Values(const math_Vector& X, double& F, math_Vector& G) override;

  //! returns the new parameters of the MultiLine.
  Standard_EXPORT const math_Vector& NewParameters() const;

  //! returns the MultiCurve approximating the set after
  //! computing the value F or Grad(F).
  Standard_EXPORT const AppParCurves_MultiCurve& CurveValue();

  //! returns the distance between the MultiPoint of range
  //! IPoint and the curve CurveIndex.
  Standard_EXPORT double Error(const int IPoint, const int CurveIndex) const;

  //! returns the maximum distance between the points
  //! and the MultiCurve.
  Standard_EXPORT double MaxError3d() const;

  //! returns the maximum distance between the points
  //! and the MultiCurve.
  Standard_EXPORT double MaxError2d() const;

  Standard_EXPORT AppParCurves_Constraint FirstConstraint(
    const occ::handle<NCollection_HArray1<AppParCurves_ConstraintCouple>>& TheConstraints,
    const int                                                              FirstPoint) const;

  Standard_EXPORT AppParCurves_Constraint LastConstraint(
    const occ::handle<NCollection_HArray1<AppParCurves_ConstraintCouple>>& TheConstraints,
    const int                                                              LastPoint) const;

protected:
  //! this method is used each time Value or Gradient is
  //! needed.
  Standard_EXPORT void Perform(const math_Vector& X);

private:
  bool                                                            Done;
  AppDef_MultiLine                                                MyMultiLine;
  AppParCurves_MultiCurve                                         MyMultiCurve;
  int                                                             Degre;
  math_Vector                                                     myParameters;
  double                                                          FVal;
  math_Vector                                                     ValGrad_F;
  math_Matrix                                                     MyF;
  math_Matrix                                                     PTLX;
  math_Matrix                                                     PTLY;
  math_Matrix                                                     PTLZ;
  math_Matrix                                                     A;
  math_Matrix                                                     DA;
  AppDef_ParLeastSquareOfTheGradient                              MyLeastSquare;
  bool                                                            Contraintes;
  int                                                             NbP;
  int                                                             NbCu;
  int                                                             Adeb;
  int                                                             Afin;
  occ::handle<NCollection_HArray1<int>>                           tabdim;
  double                                                          ERR3d;
  double                                                          ERR2d;
  int                                                             FirstP;
  int                                                             LastP;
  occ::handle<NCollection_HArray1<AppParCurves_ConstraintCouple>> myConstraints;
};

#endif // _AppDef_ParFunctionOfTheGradient_HeaderFile
