// File:	TopOpeBRepBuild_Area2dBuilder.cxx
// Created:	Thu Dec 21 17:07:40 1995
// Author:	Jean Yves LEBEY
//		<jyl@meteox>
//Copyright:	 Matra Datavision 1995

#include <TopOpeBRepBuild_Area2dBuilder.ixx>
#include <TopOpeBRepBuild_Loop.hxx>

#ifdef DEB
Standard_IMPORT Standard_Boolean TopOpeBRepBuild_GettraceAREA();
#endif

//=======================================================================
//function : TopOpeBRepBuild_Area2dBuilder
//purpose  : 
//=======================================================================

TopOpeBRepBuild_Area2dBuilder::TopOpeBRepBuild_Area2dBuilder()
{
}

//=======================================================================
//function : TopOpeBRepBuild_Area2dBuilder
//purpose  : 
//=======================================================================

TopOpeBRepBuild_Area2dBuilder::TopOpeBRepBuild_Area2dBuilder
(TopOpeBRepBuild_LoopSet& LS, TopOpeBRepBuild_LoopClassifier& LC,
 const Standard_Boolean ForceClass)
{
  InitAreaBuilder(LS,LC,ForceClass);
}

//=======================================================================
//function : InitAreaBuilder
//purpose  : 
//=======================================================================

void TopOpeBRepBuild_Area2dBuilder::InitAreaBuilder
(TopOpeBRepBuild_LoopSet&        LS,
 TopOpeBRepBuild_LoopClassifier& LC,
 const Standard_Boolean ForceClass)
{
  TopAbs_State     state;
  Standard_Boolean Loopinside;
  Standard_Boolean loopoutside;
  
  TopOpeBRepBuild_ListIteratorOfListOfListOfLoop AreaIter;
  TopOpeBRepBuild_ListIteratorOfListOfLoop       LoopIter;
  // boundaryloops : list of boundary loops out of the areas.
  TopOpeBRepBuild_ListOfLoop                     boundaryloops; 
  
  myArea.Clear();          // Clear the list of Area to be built
  
  for (LS.InitLoop(); LS.MoreLoop(); LS.NextLoop()) {
    
    // process a new loop : L is the new current Loop
    const Handle(TopOpeBRepBuild_Loop)& L = LS.Loop();
    Standard_Boolean boundaryL = L->IsShape();
    
    // L = shape et ForceClass  : on traite L comme un block
    // L = shape et !ForceClass : on traite L comme un pur shape
    // L = !shape               : on traite L comme un block
    Standard_Boolean traitercommeblock = (!boundaryL) || ForceClass;
    if ( ! traitercommeblock ) {

      // the loop L is a boundary loop : 
      // - try to insert it in an existing area, such as L is inside all 
      //   the block loops. Only block loops of the area are compared. 
      // - if L could not be inserted, store it in list of boundary loops.

      Loopinside = Standard_False; 
      for (AreaIter.Initialize(myArea); AreaIter.More(); AreaIter.Next()) {
	TopOpeBRepBuild_ListOfLoop& aArea = AreaIter.Value();
	if ( aArea.IsEmpty() ) continue;
	state = CompareLoopWithListOfLoop(LC,L,aArea,TopOpeBRepBuild_BLOCK );
	if (state == TopAbs_UNKNOWN) Atomize(state,TopAbs_IN);
	Loopinside = ( state == TopAbs_IN);
	if ( Loopinside ) break;
      } // end of Area scan

      if ( Loopinside ) {
	TopOpeBRepBuild_ListOfLoop& aArea = AreaIter.Value();
	ADD_Loop_TO_LISTOFLoop(L,aArea,(void*)("IN, to current area"));
      }
      else if ( ! Loopinside ) {
	ADD_Loop_TO_LISTOFLoop(L,boundaryloops,(void*)("! IN, to boundaryloops"));
      }

    } // end of boundary loop
    
    else { 
      // the loop L is a block loop
      // if L is IN theArea :
      //   - stop area scan, insert L in theArea.
      //   - remove from the area all the loops outside L
      //   - make a new area with them, unless they are all boundary
      //   - if they are all boundary put them back in boundaryLoops
      // else :
      //   - create a new area with L.
      //   - insert boundary loops that are IN the new area
      //     (and remove them from 'boundaryloops')
      
      Loopinside = Standard_False;
      for (AreaIter.Initialize(myArea); AreaIter.More(); AreaIter.Next() ) {
	TopOpeBRepBuild_ListOfLoop& aArea = AreaIter.Value();
	if ( aArea.IsEmpty() ) continue;
 	state = CompareLoopWithListOfLoop(LC,L,aArea,TopOpeBRepBuild_ANYLOOP);
	if (state == TopAbs_UNKNOWN) Atomize(state,TopAbs_IN);
 	Loopinside = (state == TopAbs_IN);
	if ( Loopinside ) break;
      } // end of Area scan
      
      if ( Loopinside) {
	TopOpeBRepBuild_ListOfLoop& aArea = AreaIter.Value();
	Standard_Boolean allShape = Standard_True;
	TopOpeBRepBuild_ListOfLoop removedLoops;
	LoopIter.Initialize(aArea);
	while (LoopIter.More()) {
	  state = LC.Compare(LoopIter.Value(),L);
	  if (state == TopAbs_UNKNOWN) Atomize(state,TopAbs_IN); // not OUT
	  loopoutside = ( state == TopAbs_OUT );
	  if ( loopoutside ) {
	    const Handle(TopOpeBRepBuild_Loop)& curL = LoopIter.Value();
	    // remove the loop from the area
	    ADD_Loop_TO_LISTOFLoop
	      (curL,removedLoops,(void*)("loopoutside = 1, area = removedLoops"));
	    
	    allShape = allShape && curL->IsShape();
	    REM_Loop_FROM_LISTOFLoop
	      (LoopIter,AreaIter.Value(),(void*)("loop of cur. area, cur. area"));
	  }
	  else {
	    LoopIter.Next();
	  }
	}
	// insert the loop in the area
	ADD_Loop_TO_LISTOFLoop(L,aArea,(void*)("area = current"));
	if ( ! removedLoops.IsEmpty() ) {
	  if ( allShape ) {
	    ADD_LISTOFLoop_TO_LISTOFLoop
	      (removedLoops,boundaryloops,
	       (void*)("allShape = 1"),(void*)("removedLoops"),(void*)("boundaryloops"));
	  }
	  else {
	    // make a new area with the removed loops
            TopOpeBRepBuild_ListOfLoop thelist;
	    myArea.Append(thelist);
	    ADD_LISTOFLoop_TO_LISTOFLoop
	      (removedLoops,myArea.Last(),
	       (void*)("allShape = 0"),(void*)("removedLoops"),(void*)("new area"));
	  }
	}
      } // Loopinside == True
      
      else {
        Standard_Integer ashapeinside,ablockinside;
	TopOpeBRepBuild_ListOfLoop thelist1;
	myArea.Append(thelist1);
	TopOpeBRepBuild_ListOfLoop& newArea0 = myArea.Last();
	ADD_Loop_TO_LISTOFLoop(L,newArea0,(void*)("new area"));
	
        LoopIter.Initialize(boundaryloops);


        while ( LoopIter.More() ) {
          ashapeinside = ablockinside = Standard_False;
	  const Handle(TopOpeBRepBuild_Loop)& lb = LoopIter.Value();
	  state = LC.Compare(lb,L);
	  if (state == TopAbs_UNKNOWN) Atomize(state,TopAbs_IN);
          ashapeinside = (state == TopAbs_IN);
          if (ashapeinside) {
	    state = LC.Compare(L,lb);
	    if (state == TopAbs_UNKNOWN) Atomize(state,TopAbs_IN);
	    ablockinside = (state == TopAbs_IN);
	  }
	  if ( ashapeinside && ablockinside ) {
	    const Handle(TopOpeBRepBuild_Loop)& curL = LoopIter.Value();
	    ADD_Loop_TO_LISTOFLoop
	      (curL,newArea0,(void*)("ashapeinside && ablockinside, new area"));

	    REM_Loop_FROM_LISTOFLoop
	      (LoopIter,boundaryloops,(void*)("loop of boundaryloops, boundaryloops"));
	  }
          else { 
	    LoopIter.Next();
	  }
	} // end of boundaryloops scan
      } // Loopinside == False
    } // end of block loop
  } // end of LoopSet LS scan
  
  if ( ! boundaryloops.IsEmpty() ) {
    if ( myArea.IsEmpty() )  {
#ifdef DEB
      if (TopOpeBRepBuild_GettraceAREA())
	cout<<"---"<<endl<<"--- purge"<<endl<<"---"<<endl;
#endif
      TopOpeBRepBuild_ListOfLoop newArea3;
      newArea3.Append(boundaryloops);
      myArea.Append(newArea3);
    }
  }

  InitArea();
}