// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
/**
 * @class   vtkEnSightGoldReader
 * @brief   class to read EnSight Gold files
 *
 * vtkEnSightGoldReader is a class to read EnSight Gold files into vtk.
 * Because the different parts of the EnSight data can be of various data
 * types, this reader produces multiple outputs, one per part in the input
 * file.
 * All variable information is being stored in field data.  The descriptions
 * listed in the case file are used as the array names in the field data.
 * For complex vector variables, the description is appended with _r (for the
 * array of real values) and _i (for the array if imaginary values).  Complex
 * scalar variables are stored as a single array with 2 components, real and
 * imaginary, listed in that order.
 * @warning
 * You must manually call Update on this reader and then connect the rest
 * of the pipeline because (due to the nature of the file format) it is
 * not possible to know ahead of time how many outputs you will have or
 * what types they will be.
 * This reader can only handle static EnSight datasets (both static geometry
 * and variables).
 * @par Thanks:
 * Thanks to Yvan Fournier for providing the code to support nfaced elements.
 */

#ifndef vtkEnSightGoldReader_h
#define vtkEnSightGoldReader_h

#include "vtkEnSightReader.h"
#include "vtkIOEnSightModule.h" // For export macro

VTK_ABI_NAMESPACE_BEGIN
class vtkMultiBlockDataSet;

class VTKIOENSIGHT_EXPORT vtkEnSightGoldReader : public vtkEnSightReader
{
public:
  static vtkEnSightGoldReader* New();
  vtkTypeMacro(vtkEnSightGoldReader, vtkEnSightReader);
  void PrintSelf(ostream& os, vtkIndent indent) override;

protected:
  vtkEnSightGoldReader();
  ~vtkEnSightGoldReader() override;

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

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

  /**
   * 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.
   */
  int ReadScalarsPerNode(const char* fileName, const char* description, int timeStep,
    vtkMultiBlockDataSet* output, int measured = 0, int numberOfComponents = 1,
    int component = 0) override;

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

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

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

  /**
   * Read scalars per element 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.
   */
  int ReadScalarsPerElement(const char* fileName, const char* description, int timeStep,
    vtkMultiBlockDataSet* output, int numberOfComponents = 1, int component = 0) override;

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

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

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

  /**
   * 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.
   */
  int CreateUnstructuredGridOutput(
    int partId, char line[256], const char* name, vtkMultiBlockDataSet* output) override;

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

  /**
   * 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);

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

  int NodeIdsListed;
  int ElementIdsListed;

  class FileOffsetMapInternal;
  FileOffsetMapInternal* FileOffsets;

private:
  vtkEnSightGoldReader(const vtkEnSightGoldReader&) = delete;
  void operator=(const vtkEnSightGoldReader&) = delete;

  /**
   * Opens a variable file name. This will compute the full path and then open
   * it. `variableType` is simply used to report helpful error messages.
   */
  bool OpenVariableFile(const char* fname, const char* variableType);

  /**
   * Jump forward to a particular timestep in the variable file, if
   * applicable.
   */
  bool SkipToTimeStep(const char* fileName, int timeStep);

  class UndefPartialHelper;
  friend class UndefPartialHelper;
};

VTK_ABI_NAMESPACE_END
#endif