//----------------------------------------------------------------------------
//  EgalTech 2013-2014
//----------------------------------------------------------------------------
// File : SceneGeom.cpp       Data : 10.02.14          Versione : 1.5b1
// Contenuto : Implementazione della gestione geometria della classe scena.
//
//
//
// Modifiche : 10.02.14 DS Creazione modulo.
//
//
//----------------------------------------------------------------------------

//--------------------------- Include ----------------------------------------
#include "stdafx.h"
#include "Scene.h"
#include "ObjOldGraphics.h"
#include "ObjNewGraphics.h"
#include "/EgtDev/Include/EgtILogger.h"
#include "/EgtDev/Include/EGnStringUtils.h"
#include "/EgtDev/Include/EGkFrame3d.h"
#include "/EgtDev/Include/EgtPointerOwner.h"
#include "/EgtDev/Include/EGkGdbIterator.h"
#include "/EgtDev/Include/EGkCurve.h"

using namespace std ;

//------------------------------ Constants -----------------------------------
const int OGLMAT_DIM = 16 ;


//----------------------------------------------------------------------------
bool
FrameToOpenGlMatrix( const Frame3d& frFrame, double Matrix[OGLMAT_DIM])
{
   if ( frFrame.GetType() == Frame3d::ERR)
      return false ;

   Matrix[0] = frFrame.VersX().x ;
   Matrix[1] = frFrame.VersX().y ;
   Matrix[2] = frFrame.VersX().z ;
   Matrix[3] = 0 ;
   Matrix[4] = frFrame.VersY().x ;
   Matrix[5] = frFrame.VersY().y ;
   Matrix[6] = frFrame.VersY().z ;
   Matrix[7] = 0 ;
   Matrix[8]  = frFrame.VersZ().x ;
   Matrix[9]  = frFrame.VersZ().y ;
   Matrix[10] = frFrame.VersZ().z ;
   Matrix[11] = 0 ;
   Matrix[12] = frFrame.Orig().x ;
   Matrix[13] = frFrame.Orig().y ;
   Matrix[14] = frFrame.Orig().z ;
   Matrix[15] = 1 ;

   return true ;
}

//----------------------------------------------------------------------------
ObjEGrGraphics*
CreateObjEGrGraphics( bool bNewWay)
{
   if ( bNewWay)
      return ( new ObjNewGraphics) ;
   else
      return ( new ObjOldGraphics) ;
}

//----------------------------------------------------------------------------
bool
Scene::UpdateExtension( void)
{
   BBox3d b3Ext ;
   if ( m_pGeomDB == nullptr  ||  ! m_pGeomDB->GetLocalBBox( GDB_ID_ROOT, b3Ext))
      return false ;
   return SetExtension( b3Ext) ;
}

//----------------------------------------------------------------------------
bool
Scene::DrawGroup( int nId)
{
  // recupero il riferimento del gruppo
   Frame3d frFrame ;
   if ( ! m_pGeomDB->GetGroupFrame( nId, frFrame))
      return false ;
  // se non è identità, lo aggiungo sullo stack delle matrici MODELVIEW di OpenGL
   bool bMatrix = ( frFrame.GetType() != Frame3d::TOP  ||  ! frFrame.Orig().IsSmall()) ;
   if ( bMatrix) {
      glPushMatrix() ;
      double Matrix[OGLMAT_DIM] ;
      if ( FrameToOpenGlMatrix( frFrame, Matrix))
         glMultMatrixd( Matrix) ;
   }
  // creo un iteratore
   PtrOwner<IGdbIterator> pIter( CreateGdbIterator()) ;
   if ( ! ::IsValid( pIter))
      return false ;
  // scandisco il gruppo
   pIter->SetGDB( m_pGeomDB) ;
   bool bNext = pIter->GoToFirstInGroup( nId) ;
   while ( bNext) {
     // leggo il tipo di nodo
      int nGdbType = pIter->GetGdbType() ;
     // se oggetto geometrico
      if ( nGdbType == GDB_GEO) {
        // lo recupero
         IGeoObj* pGeoObj = pIter->GetGeoObj() ;
         if ( pGeoObj == nullptr)
            return false ;
        // lo disegno
         if ( ! DrawGeoObj( pGeoObj))
            return false ;
      }
     // se gruppo
      else if ( nGdbType == GDB_GROUP) {
        // lo disegno
         if ( ! DrawGroup( pIter->GetId()))
            return false ;
      }
     // passo al successivo
      bNext = pIter->GoToNext() ;
   }
  // se necessario, ripristino lo stack delle matrici
   if ( bMatrix)
      glPopMatrix() ;

   return true ;
}

//----------------------------------------------------------------------------
bool
Scene::DrawGeoObj( IGeoObj* pGeoObj)
{
  // se non esiste grafica associata, la creo
   if ( pGeoObj->GetObjGraphics() == nullptr) {
      ObjEGrGraphics* pGraphics = CreateObjEGrGraphics( m_bNewWay) ;
      if ( pGraphics == nullptr)
         return false ;
      pGraphics->SetScene( this) ;
      pGeoObj->SetObjGraphics( pGraphics) ;
   }
  // leggo il tipo di oggetto geometrico
   int nGeoType = pGeoObj->GetType() ;
  // se curva
   if ( ( nGeoType & GEO_CURVE) != 0) {
     // recupero la curva
      const ICurve* pCurve = GetCurve( pGeoObj) ;
      if ( pCurve == nullptr)
         return false ;
     // se la grafica associata non è valida la ricalcolo
      ObjEGrGraphics* pGraphics = GetObjEGrGraphics( pGeoObj) ;
      if ( ! pGraphics->IsValid()) {
         PolyLine PL ;
         pCurve->ApproxWithLines( 0.1, 5, PL) ;
         pGraphics->AddPolyLine( PL) ; 
      }
     // visualizzo la grafica associata
      pGraphics->Draw() ;
   }

   return true ;
}

//----------------------------------------------------------------------------
bool
Scene::DeleteObjGraphicsGroup( int nId)
{
  // creo un iteratore
   PtrOwner<IGdbIterator> pIter( CreateGdbIterator()) ;
   if ( ! ::IsValid( pIter))
      return false ;
  // scandisco il gruppo
   pIter->SetGDB( m_pGeomDB) ;
   bool bNext = pIter->GoToFirstInGroup( nId) ;
   while ( bNext) {
     // leggo il tipo di nodo
      int nGdbType = pIter->GetGdbType() ;
     // se oggetto geometrico
      if ( nGdbType == GDB_GEO) {
        // lo recupero
         IGeoObj* pGeoObj = pIter->GetGeoObj() ;
         if ( pGeoObj == nullptr)
            return false ;
        // ne cancello l'eventuale parte grafica
         ObjEGrGraphics* pGraph = GetObjEGrGraphics( pGeoObj) ;
         if ( pGraph != nullptr  &&  pGraph->GetScene() == this)
            pGeoObj->SetObjGraphics( nullptr) ;
      }
     // se gruppo
      else if ( nGdbType == GDB_GROUP) {
        // ripeto sugli oggetti dello stesso
         if ( ! DeleteObjGraphicsGroup( pIter->GetId()))
            return false ;
      }
     // passo al successivo
      bNext = pIter->GoToNext() ;
   }

   return true ;
}