// Created on: 1995-10-26
// Created by: Yves FRICAUD
// Copyright (c) 1995-1999 Matra Datavision
// Copyright (c) 1999-2014 OPEN CASCADE SAS
//
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.

#include <BRepAlgo_Image.hxx>
#include <Standard_ConstructionError.hxx>
#include <TopExp_Explorer.hxx>
#include <TopoDS_Shape.hxx>
#include <TopTools_ShapeMapHasher.hxx>
#include <NCollection_DataMap.hxx>
#include <NCollection_List.hxx>
#include <NCollection_Map.hxx>

//=================================================================================================

BRepAlgo_Image::BRepAlgo_Image() = default;

//=================================================================================================

void BRepAlgo_Image::SetRoot(const TopoDS_Shape& S)
{
  roots.Append(S);
}

//=================================================================================================

void BRepAlgo_Image::Bind(const TopoDS_Shape& OldS, const TopoDS_Shape& NewS)
{
  if (down.IsBound(OldS))
  {
    throw Standard_ConstructionError(" BRepAlgo_Image::Bind");
    return;
  }
  NCollection_List<TopoDS_Shape> L;
  down.Bind(OldS, L);
  down(OldS).Append(NewS);
  up.Bind(NewS, OldS);
}

//=================================================================================================

void BRepAlgo_Image::Bind(const TopoDS_Shape& OldS, const NCollection_List<TopoDS_Shape>& L)
{
  if (HasImage(OldS))
  {
    throw Standard_ConstructionError(" BRepAlgo_Image::Bind");
    return;
  }
  NCollection_List<TopoDS_Shape>::Iterator it(L);
  for (; it.More(); it.Next())
  {
    if (!HasImage(OldS))
      Bind(OldS, it.Value());
    else
      Add(OldS, it.Value());
  }
}

//=================================================================================================

void BRepAlgo_Image::Clear()
{
  roots.Clear();
  up.Clear();
  down.Clear();
}

//=================================================================================================

void BRepAlgo_Image::Add(const TopoDS_Shape& OldS, const TopoDS_Shape& NewS)
{
  if (!HasImage(OldS))
  {
    throw Standard_ConstructionError(" BRepAlgo_Image::Add");
  }
  down(OldS).Append(NewS);
  up.Bind(NewS, OldS);
}

//=================================================================================================

void BRepAlgo_Image::Add(const TopoDS_Shape& OldS, const NCollection_List<TopoDS_Shape>& L)
{
  NCollection_List<TopoDS_Shape>::Iterator it(L);
  for (; it.More(); it.Next())
  {
    Add(OldS, it.Value());
  }
}

//=================================================================================================

void BRepAlgo_Image::Remove(const TopoDS_Shape& S)
{
  if (!up.IsBound(S))
  {
    throw Standard_ConstructionError(" BRepAlgo_Image::Remove");
  }
  const TopoDS_Shape&                      OldS = up(S);
  NCollection_List<TopoDS_Shape>&          L    = down(OldS);
  NCollection_List<TopoDS_Shape>::Iterator it(L);
  while (it.More())
  {
    if (it.Value().IsSame(S))
    {
      L.Remove(it);
      break;
    }
    it.Next();
  }
  if (L.IsEmpty())
    down.UnBind(OldS);
  up.UnBind(S);
}

//=======================================================================
// function : NCollection_List<TopoDS_Shape>&
// purpose  :
//=======================================================================

const NCollection_List<TopoDS_Shape>& BRepAlgo_Image::Roots() const
{
  return roots;
}

//=================================================================================================

bool BRepAlgo_Image::IsImage(const TopoDS_Shape& S) const
{
  return up.IsBound(S);
}

//=================================================================================================

const TopoDS_Shape& BRepAlgo_Image::ImageFrom(const TopoDS_Shape& S) const
{
  if (!up.IsBound(S))
  {
    throw Standard_ConstructionError(" BRepAlgo_Image::ImageFrom");
  }
  return up(S);
}

//=================================================================================================

const TopoDS_Shape& BRepAlgo_Image::Root(const TopoDS_Shape& S) const
{
  if (!up.IsBound(S))
  {
    throw Standard_ConstructionError(" BRepAlgo_Image::FirstImageFrom");
  }

  TopoDS_Shape S1 = up(S);
  TopoDS_Shape S2 = S;

  if (S1.IsSame(S2))
    return up(S);

  while (up.IsBound(S1))
  {
    S2 = S1;
    S1 = up(S1);
    if (S1.IsSame(S2))
      break;
  }
  return up(S2);
}

//=================================================================================================

bool BRepAlgo_Image::HasImage(const TopoDS_Shape& S) const
{
  return down.IsBound(S);
}

//=======================================================================
// function : NCollection_List<TopoDS_Shape>&
// purpose  :
//=======================================================================

const NCollection_List<TopoDS_Shape>& BRepAlgo_Image::Image(const TopoDS_Shape& S) const
{
  if (!HasImage(S))
  {
    static NCollection_List<TopoDS_Shape> L;
    L.Append(S);
    return L;
  }
  return down(S);
}

//=======================================================================
// function : NCollection_List<TopoDS_Shape>&
// purpose  :
//=======================================================================
void BRepAlgo_Image::LastImage(const TopoDS_Shape& S, NCollection_List<TopoDS_Shape>& L) const
{
  if (!down.IsBound(S))
  {
    L.Append(S);
  }
  else
  {
    NCollection_List<TopoDS_Shape>::Iterator it(down(S));
    for (; it.More(); it.Next())
    {
      if (it.Value().IsSame(S))
      {
        L.Append(S);
      }
      else
      {
        LastImage(it.Value(), L);
      }
    }
  }
}

//=================================================================================================

void BRepAlgo_Image::Compact()
{
  NCollection_DataMap<TopoDS_Shape, NCollection_List<TopoDS_Shape>, TopTools_ShapeMapHasher> M;
  NCollection_List<TopoDS_Shape>::Iterator it(roots);
  for (; it.More(); it.Next())
  {
    const TopoDS_Shape&            S = it.Value();
    NCollection_List<TopoDS_Shape> LI;
    if (HasImage(S))
      LastImage(S, LI);
    M.Bind(S, LI);
  }
  up.Clear();
  down.Clear();
  for (it.Initialize(roots); it.More(); it.Next())
  {
    if (M.IsBound(it.Value()))
    {
      Bind(it.Value(), M(it.Value()));
    }
  }
}

//=================================================================================================

void BRepAlgo_Image::Filter(const TopoDS_Shape& S, const TopAbs_ShapeEnum T)

{
  TopExp_Explorer                                        exp(S, T);
  NCollection_Map<TopoDS_Shape, TopTools_ShapeMapHasher> M;
  for (; exp.More(); exp.Next())
  {
    M.Add(exp.Current());
  }
  bool Change = true;
  while (Change)
  {
    Change = false;
    NCollection_DataMap<TopoDS_Shape, TopoDS_Shape, TopTools_ShapeMapHasher>::Iterator mit(up);
    for (; mit.More(); mit.Next())
    {
      const TopoDS_Shape& aS = mit.Key();
      if (aS.ShapeType() == T && !M.Contains(aS))
      {
        Remove(aS);
        Change = true;
        break;
      }
    }
  }
}

//=================================================================================================

void BRepAlgo_Image::RemoveRoot(const TopoDS_Shape& Root)
{
  bool isRemoved = false;
  for (NCollection_List<TopoDS_Shape>::Iterator it(roots); it.More(); it.Next())
  {
    if (Root.IsSame(it.Value()))
    {
      roots.Remove(it);
      isRemoved = true;
      break;
    }
  }

  if (!isRemoved)
    return;

  const NCollection_List<TopoDS_Shape>* pNewS = down.Seek(Root);
  if (pNewS)
  {
    for (NCollection_List<TopoDS_Shape>::Iterator it(*pNewS); it.More(); it.Next())
    {
      const TopoDS_Shape* pOldS = up.Seek(it.Value());
      if (pOldS && pOldS->IsSame(Root))
        up.UnBind(it.Value());
    }
    down.UnBind(Root);
  }
}

//=================================================================================================

void BRepAlgo_Image::ReplaceRoot(const TopoDS_Shape& OldRoot, const TopoDS_Shape& NewRoot)
{
  if (!HasImage(OldRoot))
    return;

  const NCollection_List<TopoDS_Shape>& aLImage = Image(OldRoot);
  if (HasImage(NewRoot))
    Add(NewRoot, aLImage);
  else
    Bind(NewRoot, aLImage);

  SetRoot(NewRoot);
  RemoveRoot(OldRoot);
}
