/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkSimplePointsReader.cxx

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
#include "vtkSimplePointsReader.h"

#include "vtkCellArray.h"
#include "vtkObjectFactory.h"
#include "vtkPoints.h"
#include "vtkPolyData.h"
#include "vtkSmartPointer.h"
#include "vtksys/FStream.hxx"

vtkStandardNewMacro(vtkSimplePointsReader);

//------------------------------------------------------------------------------
vtkSimplePointsReader::vtkSimplePointsReader()
{
  this->FileName = nullptr;
  this->SetNumberOfInputPorts(0);
}

//------------------------------------------------------------------------------
vtkSimplePointsReader::~vtkSimplePointsReader()
{
  this->SetFileName(nullptr);
}

//------------------------------------------------------------------------------
void vtkSimplePointsReader::PrintSelf(ostream& os, vtkIndent indent)
{
  this->Superclass::PrintSelf(os, indent);
  os << indent << "FileName: " << (this->FileName ? this->FileName : "(none)") << "\n";
}

//------------------------------------------------------------------------------
int vtkSimplePointsReader::RequestData(
  vtkInformation*, vtkInformationVector**, vtkInformationVector* outputVector)
{
  // Make sure we have a file to read.
  if (!this->FileName)
  {
    vtkErrorMacro("A FileName must be specified.");
    return 0;
  }

  // Open the input file.
  vtksys::ifstream fin(this->FileName);
  if (!fin)
  {
    vtkErrorMacro("Error opening file " << this->FileName);
    return 0;
  }

  // Allocate objects to hold points and vertex cells.
  vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();
  vtkSmartPointer<vtkCellArray> verts = vtkSmartPointer<vtkCellArray>::New();

  // Read points from the file.
  vtkDebugMacro("Reading points from file " << this->FileName);
  double x[3];
  while (fin >> x[0] >> x[1] >> x[2])
  {
    vtkIdType id = points->InsertNextPoint(x);
    verts->InsertNextCell(1, &id);
  }
  vtkDebugMacro("Read " << points->GetNumberOfPoints() << " points.");

  // Store the points and cells in the output data object.
  vtkPolyData* output = vtkPolyData::GetData(outputVector);
  output->SetPoints(points);
  output->SetVerts(verts);

  return 1;
}
