#include "vtkVRHeadTrackingStyle.h"

#include "pqActiveObjects.h"
#include "pqDataRepresentation.h"
#include "pqView.h"
#include "vtkCamera.h"
#include "vtkMath.h"
#include "vtkRenderer.h"
#include "vtkRenderWindow.h"
#include "vtkSMDoubleVectorProperty.h"
#include "vtkSMIntVectorProperty.h"
#include "vtkSMPropertyHelper.h"
#include "vtkSMRenderViewProxy.h"
#include "vtkSMRepresentationProxy.h"
#include "vtkVRQueue.h"

vtkVRHeadTrackingStyle::vtkVRHeadTrackingStyle(QObject* parentObject) :
  Superclass(parentObject)
{
  this->Proxy =0;
  this->Property =0;
  this->IsFoundProxyProperty = GetHeadPoseProxyNProperty();
}

vtkVRHeadTrackingStyle::~vtkVRHeadTrackingStyle(){}

// ----------------------------------------------------------------------------
bool vtkVRHeadTrackingStyle::handleEvent(const vtkVREventData& data)
{
  // std::cout<< "Event Name = " << data.name << std::endl;
  switch( data.eventType )
    {
  case BUTTON_EVENT:
    this->HandleButton( data );
    break;
  case ANALOG_EVENT:
    this->HandleAnalog( data );
    break;
  case TRACKER_EVENT:
    this->HandleTracker( data );
    break;
    }
  return false;
}

// ----------------------------------------------------------------------------
void vtkVRHeadTrackingStyle::HandleTracker( const vtkVREventData& data )
{
  if ( this->Name == QString(data.name.c_str()) )
    {
    this->SetHeadPoseProperty( data );
    }
}

// ----------------------------------------------------------------------------
void vtkVRHeadTrackingStyle::HandleButton( const vtkVREventData& data ){}

// ----------------------------------------------------------------------------
void vtkVRHeadTrackingStyle::HandleAnalog( const vtkVREventData& data ){}

// ----------------------------------------------------------------------------
bool vtkVRHeadTrackingStyle::GetHeadPoseProxyNProperty()
{
  pqView *view = 0;
  view = pqActiveObjects::instance().activeView();
  if ( view )
    {
    this->Proxy = vtkSMRenderViewProxy::SafeDownCast( view->getViewProxy() );
    if ( this->Proxy )
      {
      this->Property = vtkSMDoubleVectorProperty::SafeDownCast(this->Proxy->GetProperty( "EyeTransformMatrix" ) );
      if ( this->Property )
        {
        return true;
        }
      }
    }
  return false;
}

// ----------------------------------------------------------------------------
bool vtkVRHeadTrackingStyle::SetHeadPoseProperty(const vtkVREventData &data)
{
  if ( !this->IsFoundProxyProperty )
    {
    this->IsFoundProxyProperty = GetHeadPoseProxyNProperty();
    return false;
    }
  for (int i = 0; i < 16; ++i)
    {
    this->Property->SetElement( i, data.data.tracker.matrix[i] );
    }
  return true;
}

// ----------------------------------------------------------------------------
bool vtkVRHeadTrackingStyle::update()
{
  if ( !this->IsFoundProxyProperty )
    {
    this->IsFoundProxyProperty = GetHeadPoseProxyNProperty();
    return false;
    }
  this->Proxy->UpdateVTKObjects();
  this->Proxy->StillRender();
  return false;
}
