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

  Program:   Visualization Toolkit
  Module:    vtkPEnSightGoldBinaryReader.h

  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.

  =========================================================================*/
// .NAME vtkPEnSightGoldBinaryReader
// .SECTION Description
// Parallel vtkEnSightGoldBinaryReader.
// .SECTION Thanks
// <verbatim>
//
// This file has been developed as part of the CARRIOCAS (Distributed
// computation over ultra high optical internet network ) project (
// http://www.carriocas.org/index.php?lng=ang ) of the SYSTEM@TIC French ICT
// Cluster (http://www.systematic-paris-region.org/en/index.html) under the
// supervision of CEA (http://www.cea.fr) and EDF (http://www.edf.fr) by
// Oxalya (http://www.oxalya.com)
//
//  Copyright (c) CEA
//
// </verbatim>

#ifndef __vtkPEnSightGoldBinaryReader_h
#define __vtkPEnSightGoldBinaryReader_h

#include "vtkPVVTKExtensionsDefaultModule.h" //needed for exports
#include "vtkPEnSightReader.h"

class vtkMultiBlockDataSet;
class vtkUnstructuredGrid;
class vtkPoints;

class VTKPVVTKEXTENSIONSDEFAULT_EXPORT vtkPEnSightGoldBinaryReader : public vtkPEnSightReader
{
 public:
  static vtkPEnSightGoldBinaryReader *New();
  vtkTypeMacro(vtkPEnSightGoldBinaryReader, vtkPEnSightReader);
  virtual void PrintSelf(ostream& os, vtkIndent indent);

 protected:
  vtkPEnSightGoldBinaryReader();
  ~vtkPEnSightGoldBinaryReader();

  // Returns 1 if successful.  Sets file size as a side action.
  int OpenFile(const char* filename);


  // Returns 1 if successful.  Handles constructing the filename, opening the file and checking
  // if it's binary
  int InitializeFile(const char* filename);

  // Description:
  // Read the geometry file.  If an error occurred, 0 is returned; otherwise 1.
  virtual int ReadGeometryFile(const char* fileName, int timeStep,
                               vtkMultiBlockDataSet *output);

  // Description:
  // Read the measured geometry file.  If an error occurred, 0 is returned;
  // otherwise 1.
  virtual int ReadMeasuredGeometryFile(const char* fileName, int timeStep,
                                       vtkMultiBlockDataSet *output);

  // Description:
  // Read scalars per node for this dataset.  If an error occurred, 0 is
  // returned; otherwise 1.  If there will be more than one component in
  // the data array, it is assumed that 0 is the first component added.
  virtual int ReadScalarsPerNode(const char* fileName, const char* description,
                                 int timeStep, vtkMultiBlockDataSet *output,
                                 int measured = 0, int numberOfComponents = 1,
                                 int component = 0);

  // Description:
  // Read vectors per node for this dataset.  If an error occurred, 0 is
  // returned; otherwise 1.
  virtual int ReadVectorsPerNode(const char* fileName, const char* description,
                                 int timeStep, vtkMultiBlockDataSet *output,
                                 int measured = 0);

  // Description:
  // Read tensors per node for this dataset.  If an error occurred, 0 is
  // returned; otherwise 1.
  virtual int ReadTensorsPerNode(const char* fileName, const char* description,
                                 int timeStep, vtkMultiBlockDataSet *output);

  // Description:
  // Read scalars per element for this dataset.  If an error occurred, 0 is
  // returned; otherwise 1.  If there will be more than one componenet in the
  // data array, it is assumed that 0 is the first component added.
  virtual int ReadScalarsPerElement(const char* fileName, const char* description,
                                    int timeStep, vtkMultiBlockDataSet *output,
                                    int numberOfComponents = 1,
                                    int component = 0);

  // Description:
  // Read vectors per element for this dataset.  If an error occurred, 0 is
  // returned; otherwise 1.
  virtual int ReadVectorsPerElement(const char* fileName, const char* description,
                                    int timeStep, vtkMultiBlockDataSet *output);

  // Description:
  // Read tensors per element for this dataset.  If an error occurred, 0 is
  // returned; otherwise 1.
  virtual int ReadTensorsPerElement(const char* fileName, const char* description,
                                    int timeStep, vtkMultiBlockDataSet *output);

  // Description:
  // Read an unstructured part (partId) from the geometry file and create a
  // vtkUnstructuredGrid output.  Return 0 if EOF reached. Return -1 if
  // an error occurred.
  virtual int CreateUnstructuredGridOutput(int partId,
                                           char line[80],
                                           const char* name,
                                           vtkMultiBlockDataSet *output);

  // Description:
  // Read a structured part from the geometry file and create a
  // vtkStructuredGrid output.  Return 0 if EOF reached.
  virtual int CreateStructuredGridOutput(int partId,
                                         char line[256],
                                         const char* name,
                                         vtkMultiBlockDataSet *output);

  // Description:
  // Read a structured part from the geometry file and create a
  // vtkRectilinearGrid output.  Return 0 if EOF reached.
  int CreateRectilinearGridOutput(int partId, char line[256], const char* name,
                                  vtkMultiBlockDataSet *output);

  // Description:
  // Read a structured part from the geometry file and create a
  // vtkImageData output.  Return 0 if EOF reached.
  int CreateImageDataOutput(int partId, char line[80], const char* name,
                            vtkMultiBlockDataSet *output);

  // Description:
  // Internal function to read in a line up to 80 characters.
  // Returns zero if there was an error.
  int ReadLine(char result[80]);

  // Description:
  // Internal function to read in a single integer.
  // Returns zero if there was an error.
  int ReadInt(int *result);
  int ReadPartId(int *result);

  // Description:
  // Internal function to read in an integer array.
  // Returns zero if there was an error.
  int ReadIntArray(int *result, int numInts);

  // Description:
  // Internal function to read in a float array.
  // Returns zero if there was an error.
  int ReadFloatArray(float *result, int numFloats);

  // Description:
  // Read Coordinates, or just skip the part in the file.
  int ReadOrSkipCoordinates(vtkPoints* points, long offset, int partId, bool skip);

  // Description:
  // Internal method to inject Coordinates and Global Ids at the end
  // of a part read for Unstructured data.
  int InjectCoordinatesAtEnd(vtkUnstructuredGrid* output, long coordinatesOffset, int partId );

  // Description:
  // Counts the number of timesteps in the geometry file
  // This function assumes the file is already open and returns the
  // number of timesteps remaining in the file
  // The file will be closed after calling this method
  int CountTimeSteps();

  // Description:
  // Read to the next time step in the geometry file.
  int SkipTimeStep();
  int SkipStructuredGrid(char line[256]);
  int SkipUnstructuredGrid(char line[256]);
  int SkipRectilinearGrid(char line[256]);
  int SkipImageData(char line[256]);

  int NodeIdsListed;
  int ElementIdsListed;
  int Fortran;

  ifstream *IFile;
  // The size of the file could be used to choose byte order.
  long FileSize;

  // Float Vector Buffer utils
  void GetVectorFromFloatBuffer(int i, float *vector);
  void UpdateFloatBuffer();
  // The buffer
  float **FloatBuffer;
  // The buffer size. Default is 1000
  int FloatBufferSize;
  // The FloatBuffer store the vectors
  // from FloatBufferIndexBegin to FloatBufferIndexBegin + FloatBufferSize
  int FloatBufferIndexBegin;
  // X variable positions of vector number 0 in file
  long FloatBufferFilePosition;
  // Total number of vectors;
  int FloatBufferNumberOfVectors;

 private:
  vtkPEnSightGoldBinaryReader(const vtkPEnSightGoldBinaryReader&);  // Not implemented.
  void operator=(const vtkPEnSightGoldBinaryReader&);  // Not implemented.
};

#endif
