/***************************************************************************
                          TransformVisitor.cpp  -  description
                             -------------------
    begin                : Wed Jan 26 2000
    copyright            : (C) 2000 by Henrik Enqvist IB (GPL)
    email                : henqvist@excite.com
 ***************************************************************************/

#include "Private.h"
#include "TransformVisitor.h"
#include "Group.h"
#include "Shape3D.h"
#include "Sound.h"
#include "Camera.h"
#include "Light.h"
#include "BillBoard.h"
#include "CollisionBounds.h"
#include "Polygon.h"

#include "EMath.h"

TransformVisitor * TransformVisitor::p_TransformVisitor = NULL;

TransformVisitor::TransformVisitor() {
  p_GroupCamera = NULL;
}

TransformVisitor::~TransformVisitor() {
  p_TransformVisitor = NULL;
}

TransformVisitor * TransformVisitor::getInstance() {
  if (p_TransformVisitor == NULL) {
    p_TransformVisitor = new TransformVisitor();
  }
  return p_TransformVisitor;
}

void TransformVisitor::setCamera(Group * g) {
  p_GroupCamera = g;
}

void TransformVisitor::empty() {
}

void TransformVisitor::visit(Group* g) {
  // Check properties before applying transform
  if (g->m_iProperties & EM_GROUP_NO_TRANSFORM) return;

  if (g->m_iProperties & EM_GROUP_TRANSFORM_ONCE) {
    g->unsetProperty(EM_GROUP_TRANSFORM_ONCE);
    g->setProperty(EM_GROUP_NO_TRANSFORM);
  }
  // Apply the transform to the Group.
  if (g->p_Parent == NULL) {
    // The group with no parent must be the engine!
    EMath::matrixMulti(g->m_mtxSrc, EMath::identityMatrix, g->m_mtxTrans);
  } else {
    EMath::matrixMulti(g->m_mtxSrc, g->p_Parent->m_mtxTrans, g->m_mtxTrans);
  }
	
  // Apple transform to all shapes.
  vector<Shape3D*>::iterator shapeIter = g->m_vShape3D.begin();
  vector<Shape3D*>::iterator shapeEnd = g->m_vShape3D.end();
  for ( ; shapeIter != shapeEnd; ++shapeIter) {
	  
    vector<Polygon3D*>::iterator polyIter = (*shapeIter)->m_vPolygon.begin();
    vector<Polygon3D*>::iterator polyEnd = (*shapeIter)->m_vPolygon.end();
	  
    // Apply transform to all polygon normals
    for ( ; polyIter != polyEnd; ++polyIter) {
      // Rotate the normal.
      //EMath::applyMatrixRot(g->m_mtxTrans, (*polyIter)->m_nmlSrc, (*polyIter)->m_nmlTrans);
      EMathApplyMatrixRot(g->m_mtxTrans, (*polyIter)->m_nmlSrc, (*polyIter)->m_nmlTrans);
	    
      //EMath::normalizeVector((*polyIter)->m_nmlTrans); 
      // TODO: optimze - remove normalize
    }
	  
    // Apply transform to all vertices and normals
    vector<Vertex3D>::iterator srcIter = (*shapeIter)->m_vVtxSrc.begin();
    vector<Vertex3D>::iterator srcEnd = (*shapeIter)->m_vVtxSrc.end();
    vector<Vertex3D>::iterator transIter = (*shapeIter)->m_vVtxTrans.begin();
    vector<Vertex3D>::iterator nmlSrcIter = (*shapeIter)->m_vNmlSrc.begin();
    vector<Vertex3D>::iterator nmlTransIter = (*shapeIter)->m_vNmlTrans.begin();
	  
    // 		EmAssert(((*shapeIter)->m_vVtxSrc.size() ==
    // 							(*shapeIter)->m_vVtxTrans.size()) &&
    // 						 ((*shapeIter)->m_vNmlSrc.size() ==
    // 						 (*shapeIter)->m_vNmlTrans.size()), 
    // 						 "size miss match " <<
    // 						 (*shapeIter)->m_vVtxSrc.size() <<" "<<
    // 						 (*shapeIter)->m_vVtxTrans.size() <<" "<<
    // 						 (*shapeIter)->m_vNmlSrc.size() <<" "<<
    // 						 (*shapeIter)->m_vNmlTrans.size() );
	  
    for ( ; srcIter != srcEnd; 
	  ++srcIter, ++transIter, ++nmlSrcIter, ++nmlTransIter) {
      //EMath::applyMatrix(g->m_mtxTrans, (*srcIter), (*transIter));
      //EMath::applyMatrixRot(g->m_mtxTrans, (*nmlSrcIter), (*nmlTransIter));
      EMathApplyMatrix(g->m_mtxTrans, (*srcIter), (*transIter));
      EMathApplyMatrixRot(g->m_mtxTrans, (*nmlSrcIter), (*nmlTransIter));
	    
      //EMath::normalizeVector(*nmlTransIter);
      // TODO: optimize - macro instead of apply-fct calls, remove normalize
	    
      EM_COUT_D("TransformVisitor::visit() " << srcIter <<" "<<
		(*srcIter).x <<" "<< (*srcIter).y <<" "<< (*srcIter).z <<" -> "<<
		(*transIter).x <<" "<< (*transIter).y <<" "<< (*transIter).z, 0);
    }
  }
  // Apply transform to Sound.
  /*	
    if (g->oSound != NULL) {
    Vertex3D* vtx = &(g->oSound->vtxPos);
    Vertex3D* trVtx = &(g->oSound->vtxTrPos);
    EMath::applyMatrix(g->trMatrix, vtx, trVtx);
    }
  */
  // Apply transform to BillBoard.
  if (g->p_BillBoard != NULL) {
    EMath::applyMatrix(g->m_mtxTrans, g->p_BillBoard->m_vtxSrc, g->p_BillBoard->m_vtxTrans);
  }
  // Apply transform to Light.
  if (g->p_Light != NULL) {
    EMath::applyMatrix(g->m_mtxTrans, g->p_Light->m_vtxSrc, g->p_Light->m_vtxTrans);
  }
  // Apply transform to CollisionBounds
  if (g->p_CollisionBounds != NULL) {
    g->p_CollisionBounds->transform(g->m_mtxTrans);
  }
}