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

  Program:   Visualization Toolkit
  Module:    vtkGeoJSONWriter.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.

=========================================================================*/
/**
 * @class   vtkGeoJSONWriter
 * @brief   Convert vtkPolyData to Geo JSON format.
 *
 * Outputs a Geo JSON (http://www.geojson.org) description of the input
 * polydata data set.
*/

#ifndef vtkGeoJSONWriter_h
#define vtkGeoJSONWriter_h

#include "vtkIOGeoJSONModule.h" // For export macro
#include "vtkWriter.h"

class vtkLookupTable;

class VTKIOGEOJSON_EXPORT vtkGeoJSONWriter : public vtkWriter
{
public:
  static vtkGeoJSONWriter* New();
  virtual void PrintSelf( ostream& os, vtkIndent indent ) override;
  vtkTypeMacro(vtkGeoJSONWriter,vtkWriter);

  //@{
  /**
   * Accessor for name of the file that will be opened on WriteData
   */
  vtkSetStringMacro(FileName);
  vtkGetStringMacro(FileName);
  //@}

  //@{
  /**
   * Enable writing to an OutputString instead of the default, a file.
   */
  vtkSetMacro(WriteToOutputString,bool);
  vtkGetMacro(WriteToOutputString,bool);
  vtkBooleanMacro(WriteToOutputString,bool);
  //@}

  //@{
  /**
   * When WriteToOutputString in on, then a string is allocated, written to,
   * and can be retrieved with these methods.  The string is deleted during
   * the next call to write ...
   */
  vtkGetMacro(OutputStringLength, int);
  vtkGetStringMacro(OutputString);
  unsigned char *GetBinaryOutputString()
  {
    return reinterpret_cast<unsigned char *>(this->OutputString);
  }
  //@}

  //@{
  /**
   * Controls how data attributes are written out.
   * When 0, data attributes are ignored and not written at all.
   * When 1, values are mapped through a lookup table and colors are written to the output.
   * When 2, which is the default, the values are written directly.
   */
  vtkSetMacro(ScalarFormat,int);
  vtkGetMacro(ScalarFormat,int);
  //@}

  //@{
  /**
   * Controls the lookup table to use when ValueMode is set to map colors;
   */
  void SetLookupTable(vtkLookupTable *lut);
  vtkGetObjectMacro(LookupTable, vtkLookupTable);
  //@}

  /**
   * When WriteToOutputString is on, this method returns a copy of the
   * output string in a vtkStdString.
   */
  vtkStdString GetOutputStdString();

  /**
   * This convenience method returns the string, sets the IVAR to nullptr,
   * so that the user is responsible for deleting the string.
   * I am not sure what the name should be, so it may change in the future.
   */
  char *RegisterAndGetOutputString();

protected:
  vtkGeoJSONWriter();
  virtual ~vtkGeoJSONWriter();

  // Only accepts vtkPolyData
  virtual int FillInputPortInformation(int port, vtkInformation *info) override;

  // Implementation of Write()
  void WriteData() override;

  // Helper for Write that writes attributes out
  void WriteScalar(vtkDataArray *da, vtkIdType ptId);
  vtkLookupTable *LookupTable;

  bool WriteToOutputString;
  char *OutputString;
  int OutputStringLength;

  int ScalarFormat;

  // Internal helpers
  ostream *OpenFile();
  void ConditionalComma(vtkIdType, vtkIdType);
  void CloseFile(ostream *);
  class Internals;
  Internals *WriterHelper;
  char* FileName;

private:
  vtkGeoJSONWriter(const vtkGeoJSONWriter&) = delete;
  void operator=(const vtkGeoJSONWriter&) = delete;
};

#endif // vtkGeoJSONWriter_h
