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

  Program:   Visualization Toolkit
  Module:    TransmitImageDataRenderPass.cxx

  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.

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

// Tests vtkTransmitImageData.

#include "vtkActor.h"
#include "vtkCamera.h"
#include "vtkCameraPass.h"
#include "vtkCompositeRenderManager.h"
#include "vtkContourFilter.h"
#include "vtkDataObject.h"
#include "vtkDataSetSurfaceFilter.h"
#include "vtkDebugLeaks.h"
#include "vtkDepthPeelingPass.h"
#include "vtkElevationFilter.h"
#include "vtkLightsPass.h"
#include "vtkMPICommunicator.h"
#include "vtkMPIController.h"
#include "vtkObjectFactory.h"
#include "vtkOpaquePass.h"
#include "vtkOpenGLRenderer.h"
#include "vtkOverlayPass.h"
#include "vtkPolyDataMapper.h"
#include "vtkPolyDataWriter.h"
#include "vtkProcess.h"
#include "vtkRegressionTestImage.h"
#include "vtkRenderPassCollection.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkSequencePass.h"
#include "vtkSmartPointer.h"
#include "vtkStructuredPoints.h"
#include "vtkStructuredPointsReader.h"
#include "vtkTestUtilities.h"
#include "vtkTranslucentPass.h"
#include "vtkTransmitImageDataPiece.h"
#include "vtkVolumetricPass.h"

#include <vtk_mpi.h>

namespace
{

class MyProcess : public vtkProcess
{
public:
  static MyProcess* New();

  void Execute() override;

  void SetArgs(int anArgc, char* anArgv[]);

protected:
  MyProcess();

  int Argc;
  char** Argv;
};

vtkStandardNewMacro(MyProcess);

MyProcess::MyProcess()
{
  this->Argc = 0;
  this->Argv = nullptr;
}

void MyProcess::SetArgs(int anArgc, char* anArgv[])
{
  this->Argc = anArgc;
  this->Argv = anArgv;
}

void MyProcess::Execute()
{
  this->ReturnValue = 1;
  int numProcs = this->Controller->GetNumberOfProcesses();
  int me = this->Controller->GetLocalProcessId();

  int i, go;

  vtkSmartPointer<vtkCompositeRenderManager> prm =
    vtkSmartPointer<vtkCompositeRenderManager>::New();

  // READER
  vtkSmartPointer<vtkStructuredPoints> sp;
  if (me == 0)
  {
    vtkSmartPointer<vtkStructuredPointsReader> spr =
      vtkSmartPointer<vtkStructuredPointsReader>::New();
    char* fname = vtkTestUtilities::ExpandDataFileName(this->Argc, this->Argv, "Data/ironProt.vtk");
    spr->SetFileName(fname);
    sp = spr->GetOutput();
    spr->Update();
    delete[] fname;

    go = 1;
    if ((sp == nullptr) || (sp->GetNumberOfCells() == 0))
    {
      if (sp)
      {
        cout << "Failure: input file has no cells" << endl;
      }
      go = 0;
    }
  }
  else
  {
    sp = vtkSmartPointer<vtkStructuredPoints>::New();
  }

  vtkMPICommunicator* comm = vtkMPICommunicator::SafeDownCast(this->Controller->GetCommunicator());
  comm->Broadcast(&go, 1, 0);
  if (!go)
  {
    return;
  }

  // FILTER WE ARE TRYING TO TEST
  vtkSmartPointer<vtkTransmitImageDataPiece> pass =
    vtkSmartPointer<vtkTransmitImageDataPiece>::New();
  pass->SetController(this->Controller);
  pass->SetInputData(sp);

  // FILTERING
  vtkSmartPointer<vtkContourFilter> cf = vtkSmartPointer<vtkContourFilter>::New();
  cf->SetInputConnection(pass->GetOutputPort());
  cf->SetNumberOfContours(1);
  cf->SetValue(0, 10.0);
  // I am not sure that this is needed.
  //(cf->GetInput())->RequestExactExtentOn();
  cf->ComputeNormalsOff();
  vtkSmartPointer<vtkElevationFilter> elev = vtkSmartPointer<vtkElevationFilter>::New();
  elev->SetInputConnection(cf->GetOutputPort());
  elev->SetScalarRange(me, me + .001);

  // COMPOSITE RENDER
  vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputConnection(elev->GetOutputPort());
  mapper->SetScalarRange(0, numProcs);
  mapper->SetPiece(me);
  mapper->SetNumberOfPieces(numProcs);
  // mapper->SetNumberOfPieces(2);
  vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);
  vtkRenderer* renderer = prm->MakeRenderer();
  vtkOpenGLRenderer* glrenderer = vtkOpenGLRenderer::SafeDownCast(renderer);

  // the rendering passes
  vtkSmartPointer<vtkCameraPass> cameraP = vtkSmartPointer<vtkCameraPass>::New();
  vtkSmartPointer<vtkSequencePass> seq = vtkSmartPointer<vtkSequencePass>::New();
  vtkSmartPointer<vtkOpaquePass> opaque = vtkSmartPointer<vtkOpaquePass>::New();
  vtkSmartPointer<vtkDepthPeelingPass> peeling = vtkSmartPointer<vtkDepthPeelingPass>::New();
  peeling->SetMaximumNumberOfPeels(200);
  peeling->SetOcclusionRatio(0.1);
  vtkSmartPointer<vtkTranslucentPass> translucent = vtkSmartPointer<vtkTranslucentPass>::New();
  peeling->SetTranslucentPass(translucent);
  vtkSmartPointer<vtkVolumetricPass> volume = vtkSmartPointer<vtkVolumetricPass>::New();
  vtkSmartPointer<vtkOverlayPass> overlay = vtkSmartPointer<vtkOverlayPass>::New();
  vtkSmartPointer<vtkLightsPass> lights = vtkSmartPointer<vtkLightsPass>::New();
  vtkSmartPointer<vtkRenderPassCollection> passes = vtkSmartPointer<vtkRenderPassCollection>::New();
  passes->AddItem(lights);
  passes->AddItem(opaque);
  passes->AddItem(peeling);
  passes->AddItem(volume);
  passes->AddItem(overlay);
  seq->SetPasses(passes);
  cameraP->SetDelegatePass(seq);
  glrenderer->SetPass(cameraP);

  renderer->AddActor(actor);
  vtkRenderWindow* renWin = prm->MakeRenderWindow();
  renWin->AddRenderer(renderer);
  renderer->SetBackground(0, 0, 0);
  renWin->SetSize(300, 300);
  renWin->SetPosition(0, 360 * me);
  prm->SetRenderWindow(renWin);
  prm->SetController(this->Controller);
  prm->InitializeOffScreen(); // Mesa GL only
  if (me == 0)
  {
  }

  // We must update the whole pipeline here, otherwise node 0
  // goes into GetActiveCamera which updates the pipeline, putting
  // it into vtkDistributedDataFilter::Execute() which then hangs.
  // If it executes here, dd will be up-to-date won't have to
  // execute in GetActiveCamera.

  mapper->SetPiece(me);
  mapper->SetNumberOfPieces(numProcs);
  mapper->Update();

  const int MY_RETURN_VALUE_MESSAGE = 0x11;

  if (me == 0)
  {
    vtkCamera* camera = renderer->GetActiveCamera();
    // camera->UpdateViewport(renderer);
    camera->SetParallelScale(16);

    prm->ResetAllCameras();

    renWin->Render();
    renWin->Render();

    this->ReturnValue = vtkRegressionTester::Test(this->Argc, this->Argv, renWin, 10);

    prm->StopServices();
    for (i = 1; i < numProcs; i++)
    {
      this->Controller->Send(&this->ReturnValue, 1, i, MY_RETURN_VALUE_MESSAGE);
    }
  }
  else
  {
    prm->StartServices();
    this->Controller->Receive(&this->ReturnValue, 1, 0, MY_RETURN_VALUE_MESSAGE);
  }
  renWin->Delete();
  renderer->Delete();
}

}

int TransmitImageDataRenderPass(int argc, char* argv[])
{
  // This is here to avoid false leak messages from vtkDebugLeaks when
  // using mpich. It appears that the root process which spawns all the
  // main processes waits in MPI_Init() and calls exit() when
  // the others are done, causing apparent memory leaks for any objects
  // created before MPI_Init().
  MPI_Init(&argc, &argv);

  // Note that this will create a vtkMPIController if MPI
  // is configured, vtkThreadedController otherwise.
  vtkSmartPointer<vtkMPIController> contr = vtkSmartPointer<vtkMPIController>::New();
  contr->Initialize(&argc, &argv, 1);

  int retVal = 1;

  vtkMultiProcessController::SetGlobalController(contr);

  int numProcs = contr->GetNumberOfProcesses();
  int me = contr->GetLocalProcessId();

  if (numProcs != 2)
  {
    if (me == 0)
    {
      cout << "DistributedData test requires 2 processes" << endl;
    }
    return retVal;
  }

  if (!contr->IsA("vtkMPIController"))
  {
    if (me == 0)
    {
      cout << "DistributedData test requires MPI" << endl;
    }
    contr->Delete();
    return retVal; // is this the right error val?   TODO
  }

  MyProcess* p = MyProcess::New();
  p->SetArgs(argc, argv);
  contr->SetSingleProcessObject(p);
  contr->SingleMethodExecute();

  retVal = p->GetReturnValue();
  p->Delete();

  contr->Finalize();

  return !retVal;
}
