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

  Program:   ParaView
  Module:    vtkPlot3DMetaReader.h

  Copyright (c) Kitware, Inc.
  All rights reserved.
  See Copyright.txt or http://www.paraview.org/HTML/Copyright.html 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.

=========================================================================*/
/**
 * @class   vtkPlot3DMetaReader
 * @brief   reads meta-files points to PLOT3D files
 *
 * The main goal of this reader is to make it easy to read PLOT3D files,
 * specifically time series of PLOT3D files. PLOT3D files can take many
 * different forms based on their content. Unfortunately, it is not a
 * self-describing format therefore the user needs to pass information
 * about the contents of the file to the reader. Normally, this is done
 * by setting a number of member variables. The goal of this reader is
 * to provide a simple format that enable the writer of the PLOT3D file
 * to describe its settings as well as group a number of files as a time
 * series. Note that for binary files, the auto-detect-format option,
 * which is on by default negates the need to specify most other option.
 * However, this reader is still very useful when trying to read file
 * series even for binary files. The format for this meta-file is very simple
 * and is based on JSON (there is no need to know anything about JSON to
 * understand this format). Below is an example with comments (followed by //)
 * that describe the format. Note that the PLOT3D file names are relative
 * to the location of the meta-file unless they start with a leading /.
 *
 * \verbatim
 * {
 * "auto-detect-format" : true // Tells the reader to try to figure out the format automatically. Only works
 *                             // with binary file. This is on by default, negating the need for most other
 *                             // options for binary files (format, byte-order, precision, multi-grid,
 *                             // blanking, 2D).
 * "format" : "binary",  // Is this a binary or ascii file, values : binary, ascii
 * "byte-order" : "big", // Byte order for binary files, values : little, big (denoting little or big endian)
 * "precision" : 32,     // Precision of floating point values, can be 32 or 64 (bits)
 * "multi-grid" : false, // Is this a multi-grid file, values: true, false
 * "language" : "C",     // Which language was this file written in, values : C, fortran. This is
 *                       // used to determine if an binary PLOT3D file contains byte counts, used by
 *                       // Fortran IO routines.
 * "blanking" : false,   // Does this file have blanking information (iblanks), values : true, false
 * "2D" : false,         // Is this a 2D dataset, values : true, false
 * "R" : 8.314,          // The value of the gas constant, default is 1.0. Set this according to the dimensions you use
 * "gamma" : 1.4,        // Ratio of specific heats. Default is 1.4.
 * "functions": [ 110, 200, 201 ],  // Additional derived values to calculate. This is an array of integers formatted
 *                                  // as [ value, value, value, ...]
 * "filenames" : [     // List of xyz (geometry) and q (value) file names along with the time values.
 *                     // This is an array which contains items in the format:
 *                     // {"time" : values, "xyz" : "xyz file name", "q" : "q file name", "function" : "function file name"}
 *                     // Note that q and function are optional. Also, you can repeat the same file name for xyz or q
 *                     // if they don't change over time. The reader will not read files unnecessarily.
 *  { "time" : 3.5, "xyz" : "combxyz.bin", "q" : "combq.1.bin", "function" : "combf.1.bin" },
 *  { "time" : 4.5, "xyz" : "combxyz.bin", "q" : "combq.2.bin", "function" : "combf.2.bin" }
 * ],
 * "function-names" : ["density", "velocity_x", "temperature"]
 *                   // list of names of functions in function files
 * }
 * \endverbatim
 *
 * This reader leverages vtkMultiBlockPLOT3DReader to do the actual
 * reading so you may want to refer to the documentation of
 * vtkMultiBlockPLOT3DReader about the details of some of these
 * parameters including the function numbers for derived value
 * calculation.
 *
 * @sa
 * vtkMultiBlockPLOT3DReader
*/

#ifndef vtkPlot3DMetaReader_h
#define vtkPlot3DMetaReader_h

#include "vtkIOParallelModule.h" // For export macro
#include "vtkMultiBlockDataSetAlgorithm.h"

#include "vtk_jsoncpp_fwd.h" // For forward declarations

struct vtkPlot3DMetaReaderInternals;

class vtkMultiBlockPLOT3DReader;

class VTKIOPARALLEL_EXPORT vtkPlot3DMetaReader : public vtkMultiBlockDataSetAlgorithm
{
public:
  static vtkPlot3DMetaReader* New();
  vtkTypeMacro(vtkPlot3DMetaReader, vtkMultiBlockDataSetAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  //@{
  /**
   * Set/Get the meta PLOT3D filename. See the class documentation for
   * format details.
   */
  vtkSetStringMacro(FileName);
  vtkGetStringMacro(FileName);
  //@}

protected:
  vtkPlot3DMetaReader();
  ~vtkPlot3DMetaReader() override;

  int RequestInformation(vtkInformation* request,
                                 vtkInformationVector** inputVector,
                                 vtkInformationVector* outputVector) override;
  int RequestData(vtkInformation*,
                          vtkInformationVector**,
                          vtkInformationVector*) override;


  char* FileName;

  void SetAutoDetectFormat(Json::Value* value);
  void SetByteOrder(Json::Value* value);
  void SetPrecision(Json::Value* val);
  void SetMultiGrid(Json::Value* val);
  void SetFormat(Json::Value* val);
  void SetBlanking(Json::Value* val);
  void Set2D(Json::Value* val);
  void SetR(Json::Value* val);
  void SetGamma(Json::Value* val);
  void SetFileNames(Json::Value* val);
  void SetLanguage(Json::Value* val);
  void AddFunctions(Json::Value* val);
  void SetFunctionNames(Json::Value* val);

private:
  vtkPlot3DMetaReader(const vtkPlot3DMetaReader&) = delete;
  void operator=(const vtkPlot3DMetaReader&) = delete;

  vtkMultiBlockPLOT3DReader* Reader;
  vtkPlot3DMetaReaderInternals* Internal;
};

#endif
