// 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.

Blend_Walking::Blend_Walking(const TheSurface& Surf1,
			     const TheSurface& Surf2,
			     const Handle(TheTopolTool)& Domain1,
			     const Handle(TheTopolTool)& Domain2,
                             const Handle(ChFiDS_HElSpine)& HGuide):
       sol(1,4),surf1(Surf1),surf2(Surf2),
       ToCorrectOnRst1(Standard_False),ToCorrectOnRst2(Standard_False),
       done(Standard_False),
       clasonS1(Standard_True),clasonS2(Standard_True),
       check2d(Standard_True),check(Standard_True),
       twistflag1(Standard_False),twistflag2(Standard_False)

{
  domain1 = Domain1;
  domain2 = Domain2;
  recdomain1 = Domain1;
  recdomain2 = Domain2;
  hguide = HGuide;
}

void Blend_Walking::SetDomainsToRecadre(const Handle(TheTopolTool)& Domain1,
					const Handle(TheTopolTool)& Domain2)
{
  recdomain1 = Domain1;
  recdomain2 = Domain2;
}

void Blend_Walking::AddSingularPoint(const Blend_Point& P) 
{
  if (jalons.Length() == 0) {
    jalons.Append(P);
  }
  else {
    Standard_Integer ii, jj;
    Standard_Real tp = P.Parameter(), 
                  ti=jalons.First().Parameter();
    for (jj=1, ii=1; ii<=jalons.Length() && tp>ti; ii++) {
      jj = ii;
      ti = jalons.Value(jj).Parameter();
    }
    if (tp > ti) jalons.InsertAfter(jj, P);
    else         jalons.InsertBefore(jj, P); 
  }
}

void Blend_Walking::Perform(Blend_Function& Func,
			    Blend_FuncInv& FuncInv,
			    const Standard_Real Pdep,   
			    const Standard_Real Pmax,
			    const Standard_Real MaxStep,
			    const Standard_Real TolGuide,
			    const math_Vector& ParDep,
			    const Standard_Real Tolesp,
			    const Standard_Real Fleche,
			    const Standard_Boolean Appro)
{

  done = Standard_False;
  iscomplete = Standard_False;
  comptra = Standard_False;
  Standard_Boolean doextremities = 1;
  if(line.IsNull()) line = new TheLine ();
  else {line->Clear();doextremities = 0;}
  tolesp = Abs(Tolesp);
  tolgui = Abs(TolGuide);
  fleche = Abs(Fleche);
  rebrou = Standard_False;
  pasmax = Abs(MaxStep);
  if (Pmax-Pdep >= 0.) {
    sens = 1.;
  }
  else {
    sens = -1.;
  }

  Blend_Status State;

  param = Pdep;
  Func.Set(param);

  if (Appro) {

    TopAbs_State situ1,situ2;
    math_Vector tolerance(1,4),infbound(1,4),supbound(1,4);
    Func.GetTolerance(tolerance,tolesp);
    Func.GetBounds(infbound,supbound);
    math_FunctionSetRoot rsnld(Func,tolerance,30);

    rsnld.Perform(Func,ParDep,infbound,supbound);
    
    if (!rsnld.IsDone()) {
      return;
    }
    rsnld.Root(sol);

    if(clasonS1) situ1 = domain1->Classify(gp_Pnt2d(sol(1),sol(2)),
					   Min(tolerance(1),tolerance(2)),0);
    else situ1 = TopAbs_IN;
    if(clasonS2) situ2 = domain2->Classify(gp_Pnt2d(sol(3),sol(4)),
					   Min(tolerance(3),tolerance(4)),0);
    else situ2 = TopAbs_IN;

    if (situ1 != TopAbs_IN || situ2 != TopAbs_IN) {
      return;
    }
  }
  else {
    sol = ParDep;
  }

#ifdef OCCT_DEBUG
  sectioncalculee = 0;
#endif
  State = TestArret(Func, Blend_OK, Standard_False);
  if (State!=Blend_OK) {
    return;
  }
#ifdef OCCT_DEBUG
  if (Blend_GettraceDRAWSECT()){
    Drawsect(surf1,surf2,sol,param,Func);
  }
  nbcomputedsection = 1;
#endif
  // Mettre a jour la ligne.
  //Correct first parameter if needed
  if (ToCorrectOnRst1 || ToCorrectOnRst2)
    previousP.SetParameter(CorrectedParam);
  line->Append(previousP);

  if(doextremities){
    TheExtremity ptf1 (previousP.PointOnS1(),
		       sol(1),sol(2),tolesp);
    TheExtremity ptf2 (previousP.PointOnS2(),
		       sol(3),sol(4),tolesp);
    if (!previousP.IsTangencyPoint()) {
      ptf1.SetTangent(previousP.TangentOnS1());
      ptf2.SetTangent(previousP.TangentOnS2());
    }
    
    if (sens>0.) {      
      line->SetStartPoints(ptf1, ptf2);      
    }
    else {
      line->SetEndPoints(ptf1, ptf2);
    }
  }

  InternalPerform(Func,FuncInv,Pmax);

  done = Standard_True;
}


Standard_Boolean Blend_Walking::PerformFirstSection(Blend_Function&     Func,
                                                    const Standard_Real Pdep,
                                                    math_Vector&        ParDep,
                                                    const Standard_Real Tolesp,
                                                    const Standard_Real TolGuide,
                                                    TopAbs_State&       Pos1,
                                                    TopAbs_State&       Pos2)
{
  iscomplete = Standard_False;
  comptra = Standard_False;
  line = new TheLine ();
  tolesp = Abs(Tolesp);
  tolgui = Abs(TolGuide);

  Pos1 = Pos2 = TopAbs_UNKNOWN;

  param = Pdep;
  Func.Set(param);

  math_Vector tolerance(1, 4),infbound(1, 4),supbound(1, 4);
  Func.GetTolerance(tolerance, tolesp);
  Func.GetBounds(infbound, supbound);
  math_FunctionSetRoot rsnld(Func, tolerance, 30);

  rsnld.Perform(Func, ParDep, infbound, supbound);

  if (!rsnld.IsDone())
  {
    return Standard_False;
  }
  rsnld.Root(sol);
  ParDep = sol;
  Pos1 = domain1->Classify(gp_Pnt2d(sol(1), sol(2)), Min(tolerance(1), tolerance(2)), 0);
  Pos2 = domain2->Classify(gp_Pnt2d(sol(3), sol(4)), Min(tolerance(3), tolerance(4)), 0);
  if (Pos1 != TopAbs_IN || Pos2 != TopAbs_IN)
  {
    return Standard_False;
  }

  TestArret(Func, Blend_OK, Standard_False);
  #ifdef OCCT_DEBUG
    if (Blend_GettraceDRAWSECT())
    {
     Drawsect(surf1, surf2, sol, param, Func);
    }
  #endif
  return Standard_True;
}


Standard_Boolean Blend_Walking::PerformFirstSection (Blend_Function& Func,
                                                     Blend_FuncInv& FuncInv,
                                                     const Standard_Real Pdep,
                                                     const Standard_Real Pmax,
                                                     const math_Vector& ParDep,
                                                     const Standard_Real Tolesp,
                                                     const Standard_Real TolGuide,
                                                     const Standard_Boolean RecOnS1,
                                                     const Standard_Boolean RecOnS2,
                                                     Standard_Real& Psol,
                                                     math_Vector& ParSol)

{
  iscomplete = Standard_False;
  comptra = Standard_False;
  line = new TheLine ();

  Standard_Real w1, w2, extrapol;
  Standard_Boolean recad1, recad2;

  tolesp = Abs(Tolesp);
  tolgui = Abs(TolGuide);
  if (Pmax - Pdep >= 0.0)
  {
    sens = 1.;
  }
  else
  {
    sens = -1.;
  }
  extrapol = Abs(Pmax - Pdep) / 50.0; // 2%

  Blend_Status State;

  param = Pdep;
  Func.Set(param);

  math_Vector tolerance(1, 4),infbound(1, 4),supbound(1, 4);
  math_Vector solrst1(1, 4),solrst2(1, 4);
  TheExtremity Ext1, Ext2;
  Standard_Integer Index1 = 0, Index2 = 0, nbarc;
  Standard_Boolean Isvtx1 = Standard_False, Isvtx2 = Standard_False;
  TheVertex Vtx1, Vtx2;
  gp_Pnt2d p2d;
  Standard_Real CorrectedU = 0., CorrectedV = 0.;
  gp_Pnt CorrectedPnt;

  Func.GetTolerance(tolerance, tolesp);
  Func.GetBounds(infbound, supbound);
  math_FunctionSetRoot rsnld(Func, tolerance, 30);

  rsnld.Perform(Func, ParDep, infbound, supbound);

  if (!rsnld.IsDone())
  {
    return Standard_False;
  }
  rsnld.Root(sol);

  w1 = w2 = Pmax;

  recad1 = RecOnS1 && Recadre(FuncInv, Standard_True, sol, solrst1,
                              Index1, Isvtx1, Vtx1, extrapol);
  if (recad1)
  {
    w1 = solrst1(2);
  }

  recad2 = RecOnS2 && Recadre(FuncInv, Standard_False, sol, solrst2,
                              Index2, Isvtx2, Vtx2, extrapol);
  if (recad2)
  {
    w2 = solrst2(2);
  }

  if (!recad1 && !recad2)
  {
    return Standard_False;
  }

  if (recad1 && recad2)
  {
    if (Abs(w1 - w2) <= tolgui)
    {
      //sol sur 1 et 2 a la fois
      State = Blend_OnRst12;
      param = w1;
      ParSol(1) = solrst2(3);
      ParSol(2) = solrst2(4);
      ParSol(3) = solrst1(3);
      ParSol(4) = solrst1(4);
    }
    else if (sens * (w2 - w1) < 0.0)
    { // on garde le plus grand
      //sol sur 1
      State = Blend_OnRst1;
      param = w1;
      
      recdomain1->Init();
      nbarc = 1;
      while (nbarc < Index1)
      {
        nbarc++;
        recdomain1->Next();
      }
      p2d = TheArcTool::Value(recdomain1->Value(), solrst1(1));
      ParSol(1) = p2d.X();
      ParSol(2) = p2d.Y();
      ParSol(3) = solrst1(3);
      ParSol(4) = solrst1(4);
      
    }
    else
    {
      //sol sur 2
      State = Blend_OnRst2;
      param = w2;
      
      recdomain2->Init();
      nbarc = 1;
      while (nbarc < Index2)
      {
        nbarc++;
        recdomain2->Next();
      }
      p2d = TheArcTool::Value(recdomain2->Value(), solrst2(1));
      ParSol(1) = solrst2(3);
      ParSol(2) = solrst2(4);
      ParSol(3) = p2d.X();
      ParSol(4) = p2d.Y();
    }
  }
  else if (recad1)
  {
    // sol sur 1
    State = Blend_OnRst1;
    param = w1;
    recdomain1->Init();
    nbarc = 1;
    while (nbarc < Index1)
    {
      nbarc++;
      recdomain1->Next();
    }
    p2d = TheArcTool::Value(recdomain1->Value(), solrst1(1));
    ParSol(1) = p2d.X();
    ParSol(2) = p2d.Y();
    ParSol(3) = solrst1(3);
    ParSol(4) = solrst1(4);
    gp_Pnt thePntOnRst = TheSurfaceTool::Value(surf1,ParSol(1),ParSol(2));
    if (CorrectExtremityOnOneRst(1, ParSol(3), ParSol(4), param, thePntOnRst,
                                 CorrectedU,CorrectedV,CorrectedPnt,CorrectedParam))
      ToCorrectOnRst1 = Standard_True;
  }
  else
  { //if (recad2) {
    //sol sur 2
    State = Blend_OnRst2;
    param = w2;
    
    recdomain2->Init();
    nbarc = 1;
    while (nbarc < Index2)
    {
      nbarc++;
      recdomain2->Next();
    }
    p2d = TheArcTool::Value(recdomain2->Value(), solrst2(1));
    ParSol(1) = solrst2(3);
    ParSol(2) = solrst2(4);
    ParSol(3) = p2d.X();
    ParSol(4) = p2d.Y();
    gp_Pnt thePntOnRst = TheSurfaceTool::Value(surf2,ParSol(3),ParSol(4));
    if (CorrectExtremityOnOneRst(2, ParSol(1), ParSol(2), param, thePntOnRst,
                                 CorrectedU,CorrectedV,CorrectedPnt,CorrectedParam))
      ToCorrectOnRst2 = Standard_True;
  }

  Psol = param;
  sol = ParSol;
  Func.Set(param);
  State = TestArret(Func, State, Standard_False);
  switch (State)
  {
  case Blend_OnRst1:
    {
#ifdef OCCT_DEBUG
      if (Blend_GettraceDRAWSECT())
      {
        Drawsect(surf1, surf2, sol, param, Func);
      }
#endif
      MakeExtremity(Ext1, Standard_True, Index1, solrst1(1), Isvtx1, Vtx1);
      if (ToCorrectOnRst1)
        Ext2.SetValue(CorrectedPnt, CorrectedU, CorrectedV, tolesp);
      else
        Ext2.SetValue(previousP.PointOnS2(), sol(3), sol(4), tolesp);
    }
    break;

  case Blend_OnRst2:
    {
#ifdef OCCT_DEBUG
      if (Blend_GettraceDRAWSECT())
      {
        Drawsect(surf1, surf2, sol, param, Func);
      }
#endif
      if (ToCorrectOnRst2)
        Ext1.SetValue(CorrectedPnt, CorrectedU, CorrectedV, tolesp);
      else
        Ext1.SetValue(previousP.PointOnS1(), sol(1), sol(2), tolesp);
      MakeExtremity(Ext2, Standard_False, Index2, solrst2(1), Isvtx2, Vtx2);
    }
    break;

  case Blend_OnRst12 :
    {
      #ifdef OCCT_DEBUG
      if (Blend_GettraceDRAWSECT())
      {
        Drawsect(surf1, surf2, sol, param, Func);
      }
      #endif
      MakeExtremity(Ext1, Standard_True , Index1, solrst1(1), Isvtx1, Vtx1);
      MakeExtremity(Ext2, Standard_False, Index2, solrst2(1), Isvtx2, Vtx2);
    }
    break;
  default:
    {
      throw Standard_Failure("Blend_Walking::PerformFirstSection : echec");
    }
  }
  if (sens < 0.0)
  {
    line->SetEndPoints(Ext1, Ext2);
  }
  else
  {
    line->SetStartPoints(Ext1, Ext2);
  }
  return Standard_True;
}



Standard_Boolean Blend_Walking::Continu(Blend_Function& Func,
					Blend_FuncInv& FuncInv,
					const Standard_Real P)
{
  if (!done) {throw StdFail_NotDone();}
  const Blend_Point& firstBP =  line->Point(1);
  const Blend_Point& lastBP =  line->Point(line->NbPoints());

  if (P < firstBP.Parameter()){
    sens = -1.;
    previousP = firstBP;
  }
  else if(P > lastBP.Parameter()){
    sens = 1.;
    previousP = lastBP;
  }

  param = previousP.Parameter();
  previousP.ParametersOnS1(sol(1),sol(2));
  previousP.ParametersOnS2(sol(3),sol(4));

  InternalPerform(Func,FuncInv,P);
  return Standard_True;
}


Standard_Boolean Blend_Walking::Continu(Blend_Function& Func,
					Blend_FuncInv& FuncInv,
					const Standard_Real P,
					const Standard_Boolean OnS1)
{
  if (!done) {throw StdFail_NotDone();}
  TheExtremity Ext1,Ext2;
  if (sens < 0.) {
    Ext1 = line->StartPointOnFirst();
    Ext2 = line->StartPointOnSecond();
    if ((OnS1 && Ext1.NbPointOnRst() == 0) ||
	(!OnS1 && Ext2.NbPointOnRst() == 0)) {
      return Standard_False;
    }
    previousP = line->Point(1);


  }
  else {
    Ext1 = line->EndPointOnFirst();
    Ext2 = line->EndPointOnSecond();
    if ((OnS1 && Ext1.NbPointOnRst() == 0) ||
	(!OnS1 && Ext2.NbPointOnRst() == 0)) {
      return Standard_False;
    }
    previousP = line->Point(line->NbPoints());
  }

  Standard_Integer length = line->NbPoints();
  param = previousP.Parameter();
  previousP.ParametersOnS1(sol(1),sol(2));
  previousP.ParametersOnS2(sol(3),sol(4));
  
  if(OnS1) clasonS1 = Standard_False;
  else clasonS2 = Standard_False;

  InternalPerform(Func,FuncInv,P);

  clasonS1 = Standard_True;
  clasonS2 = Standard_True;

  Standard_Integer newlength = line->NbPoints();
  if (sens <0.) {
    if ((OnS1 && line->StartPointOnSecond().NbPointOnRst() == 0) ||
	(!OnS1 && line->StartPointOnFirst().NbPointOnRst() == 0)) {
      line->Remove(1,newlength-length);
      line->SetStartPoints(Ext1,Ext2);
      return Standard_False;
    }
  }
  else {
    if ((OnS1 && line->EndPointOnSecond().NbPointOnRst() == 0) ||
	(!OnS1 && line->EndPointOnFirst().NbPointOnRst() == 0)) {
      line->Remove(length,newlength);
      line->SetEndPoints(Ext1,Ext2);
      return Standard_False;
    }
  }
  return Standard_True;
}


Standard_Boolean Blend_Walking::Complete(Blend_Function& Func,
					 Blend_FuncInv& FuncInv,
					 const Standard_Real Pmin)
{
  if (!done) {throw StdFail_NotDone();}
  if (iscomplete) {return Standard_True;}

  if (sens >0.) {
    previousP = line->Point(1);
  }
  else {
    previousP = line->Point(line->NbPoints());
  }

  sens = -sens;

  param = previousP.Parameter();
  previousP.ParametersOnS1(sol(1),sol(2));
  previousP.ParametersOnS2(sol(3),sol(4));

  InternalPerform(Func,FuncInv,Pmin);

  iscomplete = Standard_True;
  return Standard_True;
}

void Blend_Walking::ClassificationOnS1(const Standard_Boolean C)
{
  clasonS1 = C;
}

void Blend_Walking::ClassificationOnS2(const Standard_Boolean C)
{
  clasonS2 = C;
}

void Blend_Walking::Check2d(const Standard_Boolean C)
{
  check2d = C;
}

void Blend_Walking::Check(const Standard_Boolean C)
{
  check = C;
}