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

  Program:   ParaView
  Module:    vtkPVView.cxx

  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.

=========================================================================*/
#include "vtkPVView.h"

#include "vtkCacheSizeKeeper.h"
#include "vtkInformation.h"
#include "vtkInformationObjectBaseKey.h"
#include "vtkInformationRequestKey.h"
#include "vtkInformationVector.h"
#include "vtkObjectFactory.h"
#include "vtkPVDataRepresentation.h"
#include "vtkPVOptions.h"
#include "vtkPVSession.h"
#include "vtkPVStreamingMacros.h"
#include "vtkPVSynchronizedRenderWindows.h"
#include "vtkProcessModule.h"
#include "vtkTimerLog.h"

#include <assert.h>
#include <map>

class vtkPVView::vtkInternals
{
private:
  typedef std::map<vtkPVSession*, vtkWeakPointer<vtkPVSynchronizedRenderWindows> >
    MapOfSynchronizedWindows;
  static MapOfSynchronizedWindows SynchronizedWindows;

public:
  static vtkPVSynchronizedRenderWindows* NewSynchronizedWindows(vtkPVSession* session)
  {
    vtkPVSynchronizedRenderWindows* srw = vtkInternals::SynchronizedWindows[session].GetPointer();
    if (srw == NULL)
    {
      srw = vtkPVSynchronizedRenderWindows::New(session);
      vtkInternals::SynchronizedWindows[session] = srw;
      return srw;
    }
    else
    {
      srw->Register(NULL);
      return srw;
    }
  }
};

vtkPVView::vtkInternals::MapOfSynchronizedWindows vtkPVView::vtkInternals::SynchronizedWindows;

vtkInformationKeyMacro(vtkPVView, REQUEST_RENDER, Request);
vtkInformationKeyMacro(vtkPVView, REQUEST_UPDATE_LOD, Request);
vtkInformationKeyMacro(vtkPVView, REQUEST_UPDATE, Request);
vtkInformationKeyRestrictedMacro(vtkPVView, VIEW, ObjectBase, "vtkPVView");

bool vtkPVView::EnableStreaming = false;
//----------------------------------------------------------------------------
void vtkPVView::SetEnableStreaming(bool val)
{
  vtkPVView::EnableStreaming = val;
  vtkStreamingStatusMacro("Setting streaming status: " << val);
}

//----------------------------------------------------------------------------
bool vtkPVView::GetEnableStreaming()
{
  return vtkPVView::EnableStreaming;
}

//----------------------------------------------------------------------------
vtkPVView::vtkPVView()
{
  vtkStreamingStatusMacro("View Streaming  Status: " << vtkPVView::GetEnableStreaming());

  // Ensure vtkProcessModule is setup correctly.
  vtkProcessModule* pm = vtkProcessModule::GetProcessModule();
  if (!pm)
  {
    vtkErrorMacro("vtkProcessModule not initialized. Aborting.");
    abort();
  }

  vtkPVSession* activeSession = vtkPVSession::SafeDownCast(pm->GetActiveSession());
  if (!activeSession)
  {
    vtkErrorMacro("Could not find any active session. Aborting.");
    abort();
  }

  this->SynchronizedWindows = vtkInternals::NewSynchronizedWindows(activeSession);
  this->Identifier = 0;
  this->ViewTime = 0.0;
  this->CacheKey = 0.0;
  this->UseCache = false;

  this->RequestInformation = vtkInformation::New();
  this->ReplyInformationVector = vtkInformationVector::New();

  this->ViewTimeValid = false;
  this->LastRenderOneViewAtATime = false;

  this->Size[1] = this->Size[0] = 300;
  this->Position[0] = this->Position[1] = 0;
}

//----------------------------------------------------------------------------
vtkPVView::~vtkPVView()
{
  this->SynchronizedWindows->RemoveAllRenderers(this->Identifier);
  this->SynchronizedWindows->RemoveRenderWindow(this->Identifier);
  this->SynchronizedWindows->Delete();
  this->SynchronizedWindows = NULL;

  this->RequestInformation->Delete();
  this->ReplyInformationVector->Delete();
}

//----------------------------------------------------------------------------
void vtkPVView::Initialize(unsigned int id)
{
  if (this->Identifier == id)
  {
    // already initialized
    return;
  }
  assert(this->Identifier == 0 && id != 0);

  this->Identifier = id;
  this->SetSize(this->Size[0], this->Size[1]);
  this->SetPosition(this->Position[0], this->Position[1]);

  // enable/disable streaming. This doesn't need to done on every Initialize()
  // call, but no harm even if it is done.
  if (vtkPVOptions* options = vtkProcessModule::GetProcessModule()->GetOptions())
  {
    vtkPVView::SetEnableStreaming(options->GetEnableStreaming() != 0);
  }
}

//----------------------------------------------------------------------------
void vtkPVView::SetPosition(int x, int y)
{
  if (this->Identifier != 0)
  {
    this->SynchronizedWindows->SetWindowPosition(this->Identifier, x, y);
  }
  this->Position[0] = x;
  this->Position[1] = y;
}

//----------------------------------------------------------------------------
void vtkPVView::SetSize(int x, int y)
{
  if (this->Identifier != 0)
  {
    this->SynchronizedWindows->SetWindowSize(this->Identifier, x, y);
  }
  this->Size[0] = x;
  this->Size[1] = y;
}

//----------------------------------------------------------------------------
void vtkPVView::SetViewTime(double time)
{
  if (!this->ViewTimeValid || this->ViewTime != time)
  {
    this->ViewTime = time;
    this->ViewTimeValid = true;
    this->InvokeEvent(ViewTimeChangedEvent);
    this->Modified();
  }
}

//----------------------------------------------------------------------------
bool vtkPVView::InTileDisplayMode()
{
  int temp[2];
  return this->SynchronizedWindows->GetTileDisplayParameters(temp, temp);
}

//----------------------------------------------------------------------------
bool vtkPVView::InCaveDisplayMode()
{
  return this->SynchronizedWindows->GetIsInCave();
}

//----------------------------------------------------------------------------
bool vtkPVView::GetLocalProcessSupportsInteraction()
{
  // Remember that in batch mode, we should not create interaction on any of the
  // ranks since all views share the same render window. Setting up interactor
  // on even the root node will have unintended side effects since all views
  // share the render window.
  return this->SynchronizedWindows->GetLocalProcessIsDriver() &&
    this->SynchronizedWindows->GetMode() != vtkPVSynchronizedRenderWindows::BATCH;
}

//----------------------------------------------------------------------------
bool vtkPVView::SynchronizeBounds(double bounds[6])
{
  return this->SynchronizedWindows->SynchronizeBounds(bounds);
}

//----------------------------------------------------------------------------
bool vtkPVView::SynchronizeSize(double& size)
{
  return this->SynchronizedWindows->SynchronizeSize(size);
}

//----------------------------------------------------------------------------
bool vtkPVView::SynchronizeSize(unsigned int& size)
{
  return this->SynchronizedWindows->SynchronizeSize(size);
}

//----------------------------------------------------------------------------
void vtkPVView::PrintSelf(ostream& os, vtkIndent indent)
{
  this->Superclass::PrintSelf(os, indent);
  os << indent << "Identifier: " << this->Identifier << endl;
  os << indent << "ViewTime: " << this->ViewTime << endl;
  os << indent << "CacheKey: " << this->CacheKey << endl;
  os << indent << "UseCache: " << this->UseCache << endl;
}

//----------------------------------------------------------------------------
void vtkPVView::PrepareForScreenshot()
{
  if (!this->InTileDisplayMode())
  {
    this->LastRenderOneViewAtATime = this->SynchronizedWindows->GetRenderOneViewAtATime();
    this->SynchronizedWindows->RenderOneViewAtATimeOn();
  }
}

//----------------------------------------------------------------------------
void vtkPVView::CleanupAfterScreenshot()
{
  if (!this->InTileDisplayMode())
  {
    this->SynchronizedWindows->RenderOneViewAtATimeOff();
    this->SynchronizedWindows->SetRenderOneViewAtATime(this->LastRenderOneViewAtATime);
  }
}

//----------------------------------------------------------------------------
void vtkPVView::Update()
{
  vtkTimerLog::MarkStartEvent("vtkPVView::Update");
  // Ensure that cache size if synchronized among the processes.
  if (this->GetUseCache())
  {
    vtkCacheSizeKeeper* cacheSizeKeeper = vtkCacheSizeKeeper::GetInstance();
    unsigned int cache_full = 0;
    if (cacheSizeKeeper->GetCacheSize() > cacheSizeKeeper->GetCacheLimit())
    {
      cache_full = 1;
    }
    this->SynchronizedWindows->SynchronizeSize(cache_full);
    cacheSizeKeeper->SetCacheFull(cache_full > 0);
  }

  this->CallProcessViewRequest(
    vtkPVView::REQUEST_UPDATE(), this->RequestInformation, this->ReplyInformationVector);
  vtkTimerLog::MarkEndEvent("vtkPVView::Update");
}

//----------------------------------------------------------------------------
void vtkPVView::CallProcessViewRequest(
  vtkInformationRequestKey* type, vtkInformation* inInfo, vtkInformationVector* outVec)
{
  int num_reprs = this->GetNumberOfRepresentations();
  outVec->SetNumberOfInformationObjects(num_reprs);

  if (type == REQUEST_UPDATE())
  {
    // Pass the view time before updating the representations.
    for (int cc = 0; cc < num_reprs; cc++)
    {
      vtkDataRepresentation* repr = this->GetRepresentation(cc);
      vtkPVDataRepresentation* pvrepr = vtkPVDataRepresentation::SafeDownCast(repr);
      if (pvrepr)
      {
        // Pass the view time information to the representation
        if (this->ViewTimeValid)
        {
          pvrepr->SetUpdateTime(this->GetViewTime());
        }
      }
    }
  }

  // NOTE: This will create a reference loop (depending on what inInfo is). If
  // it's this->RequestInformation, then we have a loop and hence it's
  // essential to call vtkInformation::Clear() before this method returns.
  inInfo->Set(VIEW(), this);

  for (int cc = 0; cc < num_reprs; cc++)
  {
    vtkInformation* outInfo = outVec->GetInformationObject(cc);
    outInfo->Clear();
    vtkDataRepresentation* repr = this->GetRepresentation(cc);
    vtkPVDataRepresentation* pvrepr = vtkPVDataRepresentation::SafeDownCast(repr);
    if (pvrepr)
    {
      pvrepr->ProcessViewRequest(type, inInfo, outInfo);
    }
    else if (repr && type == REQUEST_UPDATE())
    {
      repr->Update();
    }
  }

  // Clear input information since we are done with the pass. This avoids any
  // need for garbage collection.
  inInfo->Clear();
}

//-----------------------------------------------------------------------------
void vtkPVView::AddRepresentationInternal(vtkDataRepresentation* rep)
{
  if (vtkPVDataRepresentation* drep = vtkPVDataRepresentation::SafeDownCast(rep))
  {
    if (drep->GetView() != this)
    {
      vtkErrorMacro(<< drep->GetClassName()
                    << " may not be calling this->Superclass::AddToView(...) in its "
                    << "AddToView implementation. Please fix that. "
                    << "Also check the same for RemoveFromView(..).");
    }
  }
  this->Superclass::AddRepresentationInternal(rep);
}
