// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
/**
 * @class   vtkGAMBITReader
 * @brief   reads a dataset in Fluent GAMBIT neutral file format
 *
 * vtkGAMBITReader creates an unstructured grid dataset. It reads ASCII files
 * stored in GAMBIT neutral format, with optional data stored at the nodes or
 * at the cells of the model. A cell-based fielddata stores the material id.
 *
 * @par Thanks:
 * Thanks to Jean M. Favre (CSCS, Swiss Center for Scientific Computing) who
 * developed this class.
 * Please address all comments to Jean Favre (jfavre at cscs.ch)
 *
 * @sa
 * vtkAVSucdReader
 */

#ifndef vtkGAMBITReader_h
#define vtkGAMBITReader_h

#include "vtkIOGeometryModule.h" // For export macro
#include "vtkUnstructuredGridAlgorithm.h"

VTK_ABI_NAMESPACE_BEGIN
class vtkDoubleArray;
class VTKIOGEOMETRY_EXPORT vtkGAMBITReader : public vtkUnstructuredGridAlgorithm
{
public:
  static vtkGAMBITReader* New();
  vtkTypeMacro(vtkGAMBITReader, vtkUnstructuredGridAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  ///@{
  /**
   * Specify the file name of the GAMBIT data file to read.
   */
  vtkSetFilePathMacro(FileName);
  vtkGetFilePathMacro(FileName);
  ///@}

  ///@{
  /**
   * Get the total number of cells. The number of cells is only valid after a
   * successful read of the data file is performed.
   */
  vtkGetMacro(NumberOfCells, int);
  ///@}

  ///@{
  /**
   * Get the total number of nodes. The number of nodes is only valid after a
   * successful read of the data file is performed.
   */
  vtkGetMacro(NumberOfNodes, int);
  ///@}

  ///@{
  /**
   * Get the number of data components at the nodes and cells.
   */
  vtkGetMacro(NumberOfNodeFields, int);
  vtkGetMacro(NumberOfCellFields, int);
  ///@}

protected:
  vtkGAMBITReader();
  ~vtkGAMBITReader() override;
  int RequestInformation(vtkInformation*, vtkInformationVector**, vtkInformationVector*) override;
  int RequestData(vtkInformation*, vtkInformationVector**, vtkInformationVector*) override;

  char* FileName;

  int NumberOfNodes;
  int NumberOfCells;
  int NumberOfNodeFields;
  int NumberOfCellFields;
  int NumberOfElementGroups;
  int NumberOfBoundaryConditionSets;
  int NumberOfCoordinateDirections;
  int NumberOfVelocityComponents;
  istream* FileStream;

  enum GAMBITCellType
  {
    EDGE = 1,
    QUAD = 2,
    TRI = 3,
    BRICK = 4,
    PRISM = 5,
    TETRA = 6,
    PYRAMID = 7
  };

private:
  void ReadFile(vtkUnstructuredGrid* output);
  void ReadGeometry(vtkUnstructuredGrid* output);
  void ReadNodeData(vtkUnstructuredGrid* output);
  void ReadCellData(vtkUnstructuredGrid* output);

  void ReadXYZCoords(vtkDoubleArray* coords);

  void ReadCellConnectivity(vtkUnstructuredGrid* output);
  void ReadMaterialTypes(vtkUnstructuredGrid* output);
  void ReadBoundaryConditionSets(vtkUnstructuredGrid* output);

  vtkGAMBITReader(const vtkGAMBITReader&) = delete;
  void operator=(const vtkGAMBITReader&) = delete;
};

VTK_ABI_NAMESPACE_END
#endif