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

  Program:   Visualization Toolkit
  Module:    vtkPythonProgrammableFilter.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 vtkPythonProgrammableFilter - Executes a user supplied python script
// on its input dataset to produce an output dataset.
// .SECTION Description
// This filter will execute a python script to produce an output dataset.
// An new interpretor is created at the beginning of RequestInformation().
// The state of the python interpretor is preserved until the
// next execution of RequestInformation().
// After the interpretor is creates the vtk module is imported with
// "from paraview import vtk".
//
// Then the interpretor runs the InformationScript during RequestInformation().
// This script is run in a python function called RequestInformation().
// An argument named self that refers to the programmable filter is passed
// to the function.
// The interpretor also runs the Script during RequestData().
// This script is run in a python function called RequestData().
// An argument named self that refers to the programmable filter is passed
// to the function.
// Furthermore, a set of parameters passed with the SetParameter()
// call are defined as Python variables inside both scripts. This allows
// the developer to keep the scripts the same but change their behaviour
// using parameters.
#ifndef vtkPythonProgrammableFilter_h
#define vtkPythonProgrammableFilter_h

#include "vtkPVClientServerCoreCoreModule.h" //needed for exports
#include "vtkProgrammableFilter.h"

class vtkPythonProgrammableFilterImplementation;

class VTKPVCLIENTSERVERCORECORE_EXPORT vtkPythonProgrammableFilter : public vtkProgrammableFilter
{
public:
  vtkTypeMacro(vtkPythonProgrammableFilter,vtkProgrammableFilter);
  void PrintSelf(ostream& os, vtkIndent indent);
  static vtkPythonProgrammableFilter *New();

  // Description:
  // Set the text of the python script to execute.
  vtkSetStringMacro(Script)
  vtkGetStringMacro(Script)

  // Description:
  // Set the text of the python script to execute in RequestInformation().
  vtkSetStringMacro(InformationScript)
  vtkGetStringMacro(InformationScript)

  // Description:
  // Set the text of the python script to execute in RequestUpdateExtent().
  vtkSetStringMacro(UpdateExtentScript)
  vtkGetStringMacro(UpdateExtentScript)

  // Description:
  // Set a name-value parameter that will be available to the script
  // when it is run
  void SetParameterInternal(const char *name, const char *value);
  void SetParameter(const char *name, const char *value);
  void SetParameter(const char *name, int value);
  void SetParameter(const char *name, double value);
  void SetParameter(const char *name, double value1, double value2);
  void SetParameter(const char *name, double value1, double value2, double value3);

  // Description:
  // To support repeatable-parameters.
  void AddParameter(const char* name, const char* value);
  void ClearParameter(const char* name);

  // Description:
  // Clear all name-value parameters
  void ClearParameters();

  // Description:
  // For internal use only.
  static void ExecuteScript(void *);

  // Description:
  // Changes the output data set type.
  // Allowable values are defined in vtkType.h
  vtkSetMacro(OutputDataSetType, int);
  vtkGetMacro(OutputDataSetType, int);

  // Description:
  // A semi-colon (;) separated list of directories to add to the python library
  // search path.
  vtkSetStringMacro(PythonPath);
  vtkGetStringMacro(PythonPath);

protected:
  vtkPythonProgrammableFilter();
  ~vtkPythonProgrammableFilter();

  // Description:
  // For internal use only.
  void Exec(const char*, const char*);

  virtual int FillOutputPortInformation(int port, vtkInformation* info);

  //overridden to allow multiple inputs to port 0
  virtual int FillInputPortInformation(int port, vtkInformation *info);

  // Description:
  // Creates whatever output data set type is selected.
  virtual int RequestDataObject(vtkInformation* request,
                                vtkInformationVector** inputVector,
                                vtkInformationVector* outputVector);

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

  virtual int RequestUpdateExtent(vtkInformation* request,
                                 vtkInformationVector** inputVector,
                                 vtkInformationVector* outputVector);

  // Description:
  // We want to temporarilly cache request to be used in the Python
  // code so we override this method to store request for later use
  // since otherwise we won't have access to it.
  virtual int ProcessRequest(vtkInformation* request,
                             vtkInformationVector** inInfo,
                             vtkInformationVector* outInfo);

  char *Script;
  char *InformationScript;
  char *UpdateExtentScript;
  char *PythonPath;
  int OutputDataSetType;

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

  // Description:
  // When there is a request, cache it so that we can use it inside the Python
  // source code of the filter. It is set at the beginning of ProcessRequest
  // and removed at the end of that method.
  vtkInformation* Request;

  vtkPythonProgrammableFilterImplementation* const Implementation;

};

#endif
