// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#include "vtkInitialValueProblemSolver.h"

#include "vtkFunctionSet.h"

//------------------------------------------------------------------------------
VTK_ABI_NAMESPACE_BEGIN
vtkInitialValueProblemSolver::vtkInitialValueProblemSolver()
{
  this->FunctionSet = nullptr;
  this->Vals = nullptr;
  this->Derivs = nullptr;
  this->Initialized = 0;
  this->Adaptive = 0;
}

//------------------------------------------------------------------------------
vtkInitialValueProblemSolver::~vtkInitialValueProblemSolver()
{
  this->SetFunctionSet(nullptr);
  delete[] this->Vals;
  this->Vals = nullptr;
  delete[] this->Derivs;
  this->Derivs = nullptr;
  this->Initialized = 0;
}

//------------------------------------------------------------------------------
void vtkInitialValueProblemSolver::SetFunctionSet(vtkFunctionSet* fset)
{
  if (this->FunctionSet != fset)
  {
    if (this->FunctionSet != nullptr)
    {
      this->FunctionSet->UnRegister(this);
    }
    if (fset != nullptr &&
      (fset->GetNumberOfFunctions() != fset->GetNumberOfIndependentVariables() - 1))
    {
      vtkErrorMacro("Invalid function set!");
      this->FunctionSet = nullptr;
      return;
    }
    this->FunctionSet = fset;
    if (this->FunctionSet != nullptr)
    {
      this->FunctionSet->Register(this);
    }
    this->Modified();
  }
  this->Initialize();
}

//------------------------------------------------------------------------------
void vtkInitialValueProblemSolver::PrintSelf(ostream& os, vtkIndent indent)
{
  this->Superclass::PrintSelf(os, indent);
  os << indent << "Function set : " << this->FunctionSet << endl;
  os << indent << "Function values : " << this->Vals << endl;
  os << indent << "Function derivatives: " << this->Derivs << endl;
  os << indent << "Initialized: " << (this->Initialized ? "Yes" : "No") << endl;
}

//------------------------------------------------------------------------------
void vtkInitialValueProblemSolver::Initialize()
{
  if (!this->FunctionSet)
  {
    return;
  }
  delete[] this->Vals;
  this->Vals = new double[this->FunctionSet->GetNumberOfIndependentVariables()];
  delete[] this->Derivs;
  this->Derivs = new double[this->FunctionSet->GetNumberOfFunctions()];
  this->Initialized = 1;
}
VTK_ABI_NAMESPACE_END