// 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_ResConstraintOfTheGradient_HeaderFile
#define _AppDef_ResConstraintOfTheGradient_HeaderFile

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

#include <Standard_Real.hxx>
#include <math_Matrix.hxx>
#include <math_Vector.hxx>
#include <Standard_Integer.hxx>
#include <NCollection_Array1.hxx>
#include <AppParCurves_ConstraintCouple.hxx>
#include <NCollection_HArray1.hxx>
class Standard_OutOfRange;
class AppDef_MultiLine;
class AppDef_MyLineTool;
class AppParCurves_MultiCurve;
class math_Matrix;

class AppDef_ResConstraintOfTheGradient
{
public:
  DEFINE_STANDARD_ALLOC

  //! Given a MultiLine SSP with constraints points, this
  //! algorithm finds the best curve solution to approximate it.
  //! The poles from SCurv issued for example from the least
  //! squares are used as a guess solution for the uzawa
  //! algorithm. The tolerance used in the Uzawa algorithms
  //! is Tolerance.
  //! A is the Bernstein matrix associated to the MultiLine
  //! and DA is the derivative bernstein matrix.(They can come
  //! from an approximation with ParLeastSquare.)
  //! The MultiCurve is modified. New MultiPoles are given.
  Standard_EXPORT AppDef_ResConstraintOfTheGradient(
    const AppDef_MultiLine&                                                SSP,
    AppParCurves_MultiCurve&                                               SCurv,
    const int                                                              FirstPoint,
    const int                                                              LastPoint,
    const occ::handle<NCollection_HArray1<AppParCurves_ConstraintCouple>>& Constraints,
    const math_Matrix&                                                     Bern,
    const math_Matrix&                                                     DerivativeBern,
    const double                                                           Tolerance = 1.0e-10);

  //! returns True if all has been correctly done.
  Standard_EXPORT bool IsDone() const;

  //! returns the maximum difference value between the curve
  //! and the given points.
  Standard_EXPORT double Error() const;

  Standard_EXPORT const math_Matrix& ConstraintMatrix() const;

  //! returns the duale variables of the system.
  Standard_EXPORT const math_Vector& Duale() const;

  //! Returns the derivative of the constraint matrix.
  Standard_EXPORT const math_Matrix& ConstraintDerivative(const AppDef_MultiLine& SSP,
                                                          const math_Vector&      Parameters,
                                                          const int               Deg,
                                                          const math_Matrix&      DA);

  //! returns the Inverse of Cont*Transposed(Cont), where
  //! Cont is the constraint matrix for the algorithm.
  Standard_EXPORT const math_Matrix& InverseMatrix() const;

protected:
  //! is used internally to create the fields.
  Standard_EXPORT int NbConstraints(
    const AppDef_MultiLine&                                                SSP,
    const int                                                              FirstPoint,
    const int                                                              LastPoint,
    const occ::handle<NCollection_HArray1<AppParCurves_ConstraintCouple>>& TheConstraints) const;

  //! is internally used for the fields creation.
  Standard_EXPORT int NbColumns(const AppDef_MultiLine& SSP, const int Deg) const;

private:
  bool                    Done;
  double                  Err;
  math_Matrix             Cont;
  math_Matrix             DeCont;
  math_Vector             Secont;
  math_Matrix             CTCinv;
  math_Vector             Vardua;
  int                     IncPass;
  int                     IncTan;
  int                     IncCurv;
  NCollection_Array1<int> IPas;
  NCollection_Array1<int> ITan;
  NCollection_Array1<int> ICurv;
};

#endif // _AppDef_ResConstraintOfTheGradient_HeaderFile