/*=========================================================================
                                                                                
  Program:   bbtk
  Module:    $RCSfile: bbwxvtkViewer2D.cxx,v $
  Language:  C++
  Date:      $Date: 2008/05/09 10:39:47 $
  Version:   $Revision: 1.4 $
                                                                                
  Copyright (c) CREATIS (Centre de Recherche et d'Applications en Traitement de
  l'Image). All rights reserved. See Doc/License.txt or
  http://www.creatis.insa-lyon.fr/Public/bbtk/License.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 notices for more information.
                                                                                
=========================================================================*/
/**
 *  \file 
 *  \brief 
 */


#ifdef _USE_WXWIDGETS_


#include "bbwxvtkViewer2D.h"
#include "bbwxvtkPackage.h"
//#include <wx/dialog.h>

#include "vtkInteractorStyleImage.h"
#include "vtkCamera.h"
#include "vtkRenderer.h"




namespace bbwxvtk
{

  BBTK_ADD_BLACK_BOX_TO_PACKAGE(wxvtk,Viewer2D);
  

  Viewer2DWidget::Viewer2DWidget(Viewer2D* box,
				 wxWindow *parent)
    :  
    wxPanel( parent, -1, wxDefaultPosition, wxDefaultSize, wxTAB_TRAVERSAL),
    mBox(box)
  {
    wxPanel *panel	= this;

    wxvtkrenderwindowinteractor = new wxVTKRenderWindowInteractor(panel,-1);
    wxvtkrenderwindowinteractor->UseCaptureMouseOn();	
    wxBoxSizer *sizer = new wxBoxSizer(wxVERTICAL);
    sizer	-> Add( wxvtkrenderwindowinteractor , 1, wxEXPAND, 0);
    panel	-> SetSizer(sizer);
    panel	-> SetAutoLayout(true);
    panel	-> Layout();
    
    backImageData	= NULL;
    imageViewer		= NULL;

    
  }
  //-------------------------------------------------------------------------
  
  Viewer2DWidget::~Viewer2DWidget()
  {
    //    delete wxvtkrenderwindowinteractor;
    // pourquoi pas wxvtkrenderwindowinteractor->Delete(); // JP
    // LG : because it has been allocated with operator new not method ::New 
    // we want to force its destruction without taking care of vtk ref counting
    // on the contrary the following vtk objects are deleted with vtk Delete
    if (backImageData)
      {
	backImageData->UnRegister(NULL);
      }
    if (imageViewer) 
      {
	imageViewer->Delete();
      }
    delete wxvtkrenderwindowinteractor;
  }
  
  //-------------------------------------------------------------------------
  



  void Viewer2DWidget::UpdateView()
  {
    std::cout << "Viewer2DWidget::UpdateView()" << std::endl;
    std::cout << "slice="<<mBox->bbGetInputSlice()<<std::endl;
    if ( (mBox->bbGetInputIn()!=NULL) &&
	 (backImageData != mBox->bbGetInputIn()) )
      {
	if (imageViewer==NULL)
	  {
	    imageViewer	= vtkImageViewer2::New();
	    imageViewer->SetupInteractor ( wxvtkrenderwindowinteractor );
	  }
	
	if (backImageData) backImageData->UnRegister(NULL);
	backImageData = mBox->bbGetInputIn();
	backImageData->Register(NULL);
	imageViewer->SetInput( backImageData );
	backImageData->Update();

	int x1,x2,y1,y2,z1,z2;
	double spx,spy,spz;
	backImageData->GetSpacing(spx,spy,spz);
	backImageData->GetExtent (x1,x2,y1,y2,z1,z2);
	
	bbtkMessage("Output",2,"Viewer2D '"<<mBox->bbGetName()<<"' - Image :"<<std::endl);
	bbtkMessage("Output",2," extent  = "<< x1<<"-"<<x2<<" x "<<y1<<"-"<<y2<<" x "<<z1<<"-"<<z2<<std::endl);
	bbtkMessage("Output",2," spacing = "<<spx << " - "<< spy << " - "<<spz<<std::endl);

	vtkCamera *camera = imageViewer->GetRenderer()->GetActiveCamera();

	camera->SetViewUp ( spx*0, -spy*1, spz*0);
	camera->SetPosition( spx*(x1+x2)/2, spy*(y1+y2)/2, -spz*10000000); 
	camera->SetFocalPoint	( spx*(x1+x2)/2	, spy*(y1+y2)/2	, spz*0); 


	camera->ComputeViewPlaneNormal();
	camera->SetParallelScale(  spx*(x2-x1)/2.0 );
	//		imageViewer->GetRenderer()->ResetCamera(x1,x2,y1,y2,z1,z2);
      }
  
    //    std::cout << "update"<<std::endl;   
    //    std::cout << "OW = "<< mBox->bbGetWindow() << std::endl;
    //    std::cout << "CW = "<< mBox->bbGetContainingWindow() << std::endl;
    //    std::cout << "Sh = "<< mBox->bbIsShown() << std::endl;

    // mBox->bbIsShown() is necessary to be sure that the wxWindow is already 
    // created and displayed. 
    // Else when slice != 0 we get an X Window System error with wxGTK
    if ((imageViewer!=NULL)&&
	(backImageData!=NULL)&&
	(mBox->bbIsShown()))
      {
	int z = mBox->bbGetInputSlice();
	std::cout << "slice = "<<z<<std::endl;
	int ext[6];
	backImageData->GetWholeExtent(ext);

	std::cout << "ext = "<<ext[4]<<" - "<<ext[5]<<std::endl;

	if (z<ext[4]) { z=ext[4]; }
	if (z>=ext[5]) { z=ext[5]-1; }
	// LG : SetZSlice does not exist anymore in vtk 5 !
	/*
#if (VTK_MAJOR_VERSION >= 5)
	imageViewer->SetSlice( 0 );
#else
	imageViewer->SetZSlice( 0 );
#endif


	
	wxvtkrenderwindowinteractor->Render();
	*/

#if (VTK_MAJOR_VERSION >= 5)
	imageViewer->SetSlice( z );
#else
	imageViewer->SetZSlice( z );
#endif
	wxvtkrenderwindowinteractor->Render();

      }

    

    //Refresh();
  }




  //--------------------------------------------------------------------------
  //-------------------------------------------------------------------------
  //--------------------------------------------------------------------------
  //--------------------------------------------------------------------------


  BBTK_BLACK_BOX_IMPLEMENTATION(Viewer2D,bbtk::WxBlackBox);


  void Viewer2D::Process() 
  { 
    // LG : Bug when initial slice != 0 on first time 
    // (see wxvtk/appli/ExampleSimpleSlicer)
    // I think there is a problem with rendering before window 
    // has been reparented ... we have to check this 

    ((Viewer2DWidget*)bbGetOutputWidget())->UpdateView();
    bbSetOutputOut( bbGetInputSlice() );
  }
  

  /**
   * \brief  Create wxWidget . 
   *
   *
   */ 
  void Viewer2D::CreateWidget()
  {
    bbtkDebugMessageInc("Core",9,"Viewer2D::CreateWidget()"<<std::endl);

    Viewer2DWidget* w = new Viewer2DWidget(this,bbGetWxParent());
    bbSetOutputWidget(w);

    bbtkDebugDecTab("Core",9);
  }


  // This callback is necessary to get actual processing of the view 
  // when window is shown
  void  Viewer2D::bbUserOnShow()
  {
    ((Viewer2DWidget*)bbGetOutputWidget())->UpdateView();
  }
  

}//namespace bbtk

#endif