//
//  Read CST file format
//

#include <mystdlib.h>

#include <myadt.hpp>
#include <linalg.hpp>
#include <csg.hpp>
#include <meshing.hpp>
#include <sys/stat.h>


namespace netgen
{
#include "writeuser.hpp"




  void ReadTETFormat (Mesh & mesh, 
                      const filesystem::path & filename)
  {
    cout << "Reading .tet mesh" << endl;

    ifstream in (filename);

    int inputsection = 0;
    bool done = false;

    char ch;
    string str;

    string version;

    int unitcode;
    double tolerance;
    double dS1, dS2, alphaDeg, x3D, y3D, z3D;
    int nelts,nfaces,nedges,nnodes;
    int nperiodicmasternodes,ncornerperiodicmasternodes,ncubicperiodicmasternodes;
    int nperiodicmasteredges,ncornerperiodicmasteredges;
    int nperiodicmasterfaces;
    int nodeid,type,pid;
    int dummyint;
    int modelverts,modeledges,modelfaces,modelcells;
    Point3d p;
    int numObj3D,numObj2D,numObj1D,numObj0D;
    // bool nullstarted;
    NgArray<int> eldom;
    int minId3D = -1, minId2D = -1;
    int maxId3D(-1), maxId2D(-1), maxId1D(-1), maxId0D(-1);
    NgArray<NgArray<int> *> segmentdata;
    NgArray<Element2d* > tris;

    NgArray<int> userdata_int;  // just save data for 1:1 output
    NgArray<double> userdata_double;
    NgArray<int> point_pids;
    NgArray<int> tetfacedata;
    NgArray<int> uid_to_group_3D, uid_to_group_2D, uid_to_group_1D, uid_to_group_0D;

    while(!done)
      {
        // skip "//" comment
        bool comment = true;
        while(comment)
          {
            ch = in.get();
            while(ch == ' ' || ch == '\n' || ch == '\t' || ch =='\r')
              ch = in.get();
	      
            if(ch != '/')
              {
                comment = false;
                in.putback(ch);
              }
            else
              {
                ch = in.get();
                if(ch != '/')
                  {
                    comment = false;
                    in.putback(ch);
                    in.putback('/');
                  }
                else
                  {
                    in.ignore(10000,'\n');
                  }
              }
          }

	  
        switch(inputsection)
          {
          case 0:
            // version number
            in >> version;
            cout << "Version number " << version << endl;
            if(version != "1.1" && version != "2" && version != "2.0")
              {
                cerr << "WARNING: import only tested for versions 1.1 and 2" << endl;
                //done = true;
              }
            userdata_double.Append(atof(version.c_str()));
            break;

          case 1:
            // unit code (1=CM 2=MM 3=M 4=MIC 5=NM 6=FT 7=IN 8=MIL)
            in >> unitcode;
            cout << "unit code " << unitcode << endl;
            userdata_int.Append(unitcode);
            break;

          case 2:
            // Geometric coord "zero" tolerance threshold
            in >> tolerance;
            cout << "tolerance " << tolerance << endl;
            userdata_double.Append(tolerance);
            break;

          case 3:
            // Periodic UnitCell dS1 , dS2 , alphaDeg
            in >> dS1 >> dS2 >> alphaDeg;
            userdata_double.Append(dS1);
            userdata_double.Append(dS2);
            userdata_double.Append(alphaDeg);
            break;

          case 4:
            // Periodic UnitCell origin in global coords (x3D,y3D,z3D)
            in >> x3D >> y3D >> z3D;
            userdata_double.Append(x3D);
            userdata_double.Append(y3D);
            userdata_double.Append(z3D);
            break;

          case 5:
            // Model entity count: Vertices, Edges, Faces, Cells (Version 2)
            in >> modelverts >> modeledges >> modelfaces >> modelcells;
            userdata_int.Append(modelverts);
            userdata_int.Append(modeledges);
            userdata_int.Append(modelfaces);
            userdata_int.Append(modelcells);
            break;

          case 6:
            // Topological mesh-entity counts (#elements,#faces,#edges,#nodes)
            in >> nelts >> nfaces >> nedges >> nnodes;
            cout << nelts << " elements, " << nfaces << " faces, " << nedges << " edges, " << nnodes << " nodes" << endl;
            mesh.SetAllocSize(nnodes,2*nedges,nfaces,nelts);
            break;

          case 7:
            // NodeID, X, Y, Z, Type (0=Reg 1=PMaster 2=PMinion 3=CPMaster 4=CPMinion), PID:
            {
              cout << "read nodes" << endl;
              for(int i=0; i<nnodes; i++)
                {
                  in >> nodeid >> p.X() >> p.Y() >> p.Z() >> type >> pid;
                  mesh.AddPoint(p);		  
                  point_pids.Append(pid);
                  if(pid > maxId0D)
                    maxId0D = pid;
                  //(*testout) << "point " << p << " type " << type << " mastersexist " << mastersexist << endl;
                }
            }
            break;

          case 8:
            // Number of Periodic Master Nodes
            in >> nperiodicmasternodes;
            break;

          case 9:
            // MasterNodeID, MinionNodeID, TranslCode (1=dS1 2=dS2 3=dS1+dS2)
            for(int i=0; i<nperiodicmasternodes; i++)
              {
                for(int j=0; j<2; j++)
                  in >> dummyint;

                in >> dummyint;
              }
            break;

          case 10:
            // Number of Corner Periodic Master Nodes
            in >> ncornerperiodicmasternodes;
            break;

          case 11:
            // MasterNodeID, 3-MinionNodeID's, 3-TranslCodes (1=dS1 2=dS2 3=dS1+dS2)
            for(int i=0; i<ncornerperiodicmasternodes; i++)
              {
                for(int j=0; j<4; j++)
                  in >> dummyint;

                for(int j=0; j<3; j++)
                  in >> dummyint;
              }
            break;

          case 12:
            // Number of Cubic Periodic Master Nodes
            in >> ncubicperiodicmasternodes;
            break;

          case 13:
            //MasterNodeID, 7-MinionNodeID's, TranslCodes
            for(int i=0; i<ncubicperiodicmasternodes; i++)
              {
                for(int j=0; j<8; j++)
                  in >> dummyint;

                for(int j=0; j<7; j++)
                  in >> dummyint;
              }
            break;

          case 14:
            // EdgeID, NodeID0, NodeID1, Type (0=Reg 1=PMaster 2=PMinion 3=CPMaster 4=CPMinion), PID
            cout << "read edges" << endl;
            // nullstarted = false;
            segmentdata.SetSize(nedges);
            for(int i=0; i<nedges; i++)
              {
                segmentdata[i] = new NgArray<int>(7);
                *segmentdata[i] = -1;
                in >> dummyint;
                in >> (*segmentdata[i])[0] >> (*segmentdata[i])[1];
                in >> type;
                in >> (*segmentdata[i])[2];
                if((*segmentdata[i])[2] > maxId1D)
                  maxId1D = (*segmentdata[i])[2];
              }
            break;

          case 15:
            // Number of Periodic Master Edges
            in >> nperiodicmasteredges;
            break;

          case 16:
            // MasterEdgeID, MinionEdgeID, TranslCode (1=dS1 2=dS2 3=dS1+dS2)
            for(int i=0; i<nperiodicmasteredges; i++)
              in >> dummyint >> dummyint >> dummyint;
            break;

          case 17:
            // Number of Corner Periodic Master Edges
            in >> ncornerperiodicmasteredges;
            break;

          case 18:
            // MasterEdgeID, 3 MinionEdgeID's, 3 TranslCode (1=dS1 2=dS2 3=dS1+dS2)
            for(int i=0; i<ncornerperiodicmasteredges; i++)
              {
                in >> dummyint;
                for(int j=0; j<3; j++)
                  in >> dummyint;
                for(int j=0; j<3; j++)
                  in >> dummyint;
              }
            break;

          case 19:
            // FaceID, EdgeID0, EdgeID1, EdgeID2, FaceType (0=Reg 1=PMaster 2=PMinion), PID
            {
              //Segment seg;
              int segnum_ng[3];
              bool neg[3];
              cout << "read faces" << endl;
              // nullstarted = false;
              for(int i=0; i<nfaces; i++)
                {
                  int trinum;
                  int segnum;
		    
                  tris.Append(new Element2d(TRIG));

                  in >> trinum;
                  for(int j=0; j<3; j++)
                    {
                      in >> segnum;
                      neg[j] = (segnum<0);
                      if(!neg[j])
                        segnum_ng[j] = segnum-1;
                      else
                        segnum_ng[j] = -segnum-1;
			
                      if(neg[j])
                        tris.Last()->PNum(j+1) = (*segmentdata[segnum_ng[j]])[1];
                      else
                        tris.Last()->PNum(j+1) = (*segmentdata[segnum_ng[j]])[0];

                      tris.Last()->GeomInfoPi(j+1).trignum = trinum;
                    }
                  in >> type;
                  int faceid;
                  in >> faceid;
		    
                  if(faceid > maxId2D)
                    maxId2D = faceid;

                  if(i==0 || faceid < minId2D)
                    minId2D = faceid;
		    
                  tris.Last()->SetIndex(faceid);

                  if(faceid > 0)
                    {
                      //if(nullstarted)
                      //  {
                      //    cout << "Faces: Assumption about index 0 wrong (face"<<trinum <<")" << endl;
                      //  }
                      //mesh.AddSurfaceElement(tri);
			
                      for(int j=0; j<3; j++)
                        {
                          if(neg[j])
                            {
                              (*segmentdata[segnum_ng[j]])[4] = faceid;
                              (*segmentdata[segnum_ng[j]])[6] = trinum;
                            }
                          else
                            {
                              (*segmentdata[segnum_ng[j]])[3] = faceid;
                              (*segmentdata[segnum_ng[j]])[5] = trinum;
                            }
                        }
                    }
                  // else
                  //   nullstarted = true;
                }
            }
            break;

          case 20:
            // Number of Periodic Master Faces
            in >> nperiodicmasterfaces;
            break;

          case 21:
            // MasterFaceID, MinionFaceID, TranslCode (1=dS1 2=dS2)
            {
              Vec<3> randomvec(-1.32834,3.82399,0.5429151);
              int maxtransl = -1;
              for(int i=0; i<nperiodicmasterfaces; i++)
                {
                  int tri1,tri2,transl;
                  NgArray<PointIndex> nodes1(3),nodes2(3);
                  NgArray<double> sortval1(3),sortval2(3);
                  in >> tri1 >> tri2 >> transl;

                  if(transl > maxtransl)
                    maxtransl = transl;
		    
		    
                  for(int j=0; j<3; j++)
                    {
                      nodes1[j] = tris[tri1-1]->PNum(j+1);
                      sortval1[j] = Vec<3>(mesh[nodes1[j]])*randomvec;
                      nodes2[j] = tris[tri2-1]->PNum(j+1);
                      sortval2[j] = Vec<3>(mesh[nodes2[j]])*randomvec;
                    }

                  BubbleSort(sortval1,nodes1);
                  BubbleSort(sortval2,nodes2);

                  for(int j=0; j<3; j++)
                    mesh.GetIdentifications().Add(nodes1[j],nodes2[j],transl);
			
                }
              for(int i=1; i<= maxtransl; i++)
                mesh.GetIdentifications().SetType(i,Identifications::PERIODIC);
            }	      
            break;

          case 22:
            // ElemID, FaceID0, FaceID1, FaceID2, FaceID3, PID
            {
              cout << "read elements (1)" << endl;

              //SurfaceElementIndex surf[4];
              bool neg[4];
              int elemid;
              int domain;
		
              eldom.SetSize(nelts);

              for(int i=0; i<nelts; i++)
                {
                  if(int(100.*i/nelts) % 5 == 0)
                    cout << int(100.*i/nelts)
#ifdef WIN32
                         << "%%\r"
#else
                         << "%\r"
#endif 
                         << flush;
                  in >> elemid;
                  for(int j=0; j<4;j++)
                    {
                      in >> dummyint;
                      neg[j] = (dummyint < 0);
                      if(neg[j])
                        tetfacedata.Append(-dummyint-1);
                      //surf[j] = -dummyint-1;
                      else
                        tetfacedata.Append(dummyint-1);
                      tetfacedata.Append(((neg[j]) ? 1 : 0));
                      //surf[j] = dummyint-1;
                    }
		    
                  in >> domain;
                  eldom[i] = domain;
                  tetfacedata.Append(domain);

                  if(i==0 || domain < minId3D)
                    minId3D = domain;

                  if(domain > maxId3D)
                    maxId3D = domain;
		    
                  // 		    for(int j=0; j<4; j++)
                  // 		      {
                  // 			if(mesh.GetNSE() <= surf[j])
                  // 			  continue;

                  // 			int faceind = 0;
                  // 			for(int k=1; k<=mesh.GetNFD(); k++)
                  // 			  {
                  // 			    if(mesh.GetFaceDescriptor(k).SurfNr() == mesh[surf[j]].GetIndex())
                  // 			      faceind = k;
                  // 			  }
                  // 			if(faceind)
                  // 			  {
                  // 			    if(neg[j])
                  // 			      mesh.GetFaceDescriptor(faceind).SetDomainOut(domain);
                  // 			    else
                  // 			      mesh.GetFaceDescriptor(faceind).SetDomainIn(domain);
                  // 			  }
                  // 			else
                  // 			  {
                  // 			    if(neg[j])
                  // 			      faceind = mesh.AddFaceDescriptor(FaceDescriptor(mesh[surf[j]].GetIndex(),0,domain,0));
                  // 			    else
                  // 			      faceind = mesh.AddFaceDescriptor(FaceDescriptor(mesh[surf[j]].GetIndex(),domain,0,0));
                  // 			    mesh.GetFaceDescriptor(faceind).SetBCProperty(mesh[surf[j]].GetIndex());
                  // 			  }
                  // 		      }
                }
              cout << endl;
		
		
              // 		NgArray<int> indextodescriptor(maxId2D+1);
		
              // 		for(int i=1; i<=mesh.GetNFD(); i++)
              // 		  indextodescriptor[mesh.GetFaceDescriptor(i).SurfNr()] = i;
		
		
              // 		for(SurfaceElementIndex i=0; i<mesh.GetNSE(); i++)
              // 		  mesh[i].SetIndex(indextodescriptor[mesh[i].GetIndex()]);
            }
            break;

          case 23:
            // ElemID, NodeID0, NodeID1, NodeID2, NodeID3
            { 
              cout << "read elements (2)" << endl;
              Element el(TET);
              for(ElementIndex i=0; i<nelts; i++)
                {
                  in >> dummyint;
                  for(int j=1; j<=4; j++)
                    in >> el.PNum(j);
                  swap(el.PNum(1),el.PNum(2));
		    
                  el.SetIndex(eldom[i]);
                  mesh.AddVolumeElement(el);
                }	
            }	  
            break;
	      
          case 24:
            // Physical Object counts (#Obj3D,#Obj2D,#Obj1D,#Obj0D)
            {
              in >> numObj3D;
              userdata_int.Append(numObj3D);
              in >> numObj2D;
              userdata_int.Append(numObj2D);
              in >> numObj1D;
              userdata_int.Append(numObj1D);
              in >> numObj0D;
              userdata_int.Append(numObj0D);
            }
            break;

          case 25:
            // Number of Ports (Ports are a subset of Object2D list)
            {
              in >> dummyint;
              //userdata_int.Append(dummyint);
            }
            break;

          case 26:
            // Object3D GroupID, #Elems <immediately followed by> ElemID List
            {
              uid_to_group_3D.SetSize(maxId3D+1);
              uid_to_group_3D = -1;
              for(int i=0; i<numObj3D; i++)
                {
                  int groupid;
                  in >> groupid;
                  (*testout) << "3d groupid " << groupid << endl;
                  //userdata_int.Append(groupid);
                  int nelems;
                  in >> nelems;
                  //userdata_int.Append(nelems);
                  for(int j=0; j<nelems; j++)
                    {
                      in >> dummyint;
			
                      (*testout) << "read " << dummyint << endl;
                      //userdata_int.Append(dummyint);
			
                      if(dummyint < 0) 
                        dummyint *= -1;
                      uid_to_group_3D[eldom[dummyint-1]] = groupid;
                    }
                }
            }
            break;

          case 27:
            // Object2D GroupID, #Faces <immediately followed by> FaceID List
            {
              NgArray<int> ports;
              //int totnum = 0;
              uid_to_group_2D.SetSize(maxId2D+1);
              uid_to_group_2D = -1;

              for(int i=0; i<numObj2D; i++)
                {
                  int groupid;
                  in >> groupid;
                  (*testout) << "2d groupid " << groupid << endl;
                  //userdata_int.Append(groupid);
                  int nelems;
                  in >> nelems;
                  //userdata_int.Append(nelems);
                  for(int j=0; j<nelems; j++)
                    {
                      in >> dummyint;
                      char port;
                      while((port = in.get()) == ' ')
                        ;

                      (*testout) << "read " << dummyint << endl;
                      if(dummyint < 0) 
                        dummyint *= -1;
                      int uid = tris[dummyint-1]->GetIndex();

                      if(port == 'P' || port == 'p')
                        {
                          if(!ports.Contains(uid))
                            ports.Append(uid);
                        }
                      else
                        in.putback(port);
			
                      //userdata_int.Append(dummyint);
			
                      uid_to_group_2D[uid] = groupid;
                      (*testout) << "setting " << uid << endl;

                      //totnum++;
                    }
                }
              mesh.SetUserData("TETmesh:ports",ports);
            }
            break;

          case 28:
            // Object1D GroupID, #Edges <immediately followed by> EdgeID List
            {
              uid_to_group_1D.SetSize(maxId1D+1);
              uid_to_group_1D = -1;

              for(int i=0; i<numObj1D; i++)
                {
                  int groupid;
                  in >> groupid;
                  //userdata_int.Append(groupid);
                  int nelems;
                  in >> nelems;
                  //userdata_int.Append(nelems);
                  for(int j=0; j<nelems; j++)
                    {
                      in >> dummyint;
                      //userdata_int.Append(dummyint);

                      if(dummyint < 0) 
                        dummyint *= -1;
                      uid_to_group_1D[(*segmentdata[dummyint-1])[2]] = groupid;
                    }
                }
            }
            break;

          case 29:
            // Object0D GroupID, #Nodes <immediately followed by> NodeID List
            {
              uid_to_group_0D.SetSize(maxId0D+1);
              uid_to_group_0D = -1;
              for(int i=0; i<numObj0D; i++)
                {
                  int groupid;
                  in >> groupid;
                  //userdata_int.Append(groupid);
                  int nelems;
                  in >> nelems;
                  //userdata_int.Append(nelems);
                  for(int j=0; j<nelems; j++)
                    {
                      in >> dummyint;
                      //userdata_int.Append(dummyint);

                      if(dummyint < 0) 
                        dummyint *= -1;
                      uid_to_group_0D[point_pids[dummyint-1]] = groupid;
                    }
                }
            }
            break;



          default:
            done = true;
	      
          }
	  
        if(inputsection == 4 && version == "1.1")
          inputsection++;

        inputsection++;
      }
    in.close();


    mesh.SetUserData("TETmesh:double",userdata_double);
    userdata_int.Append(minId2D);
    userdata_int.Append(minId3D);
    mesh.SetUserData("TETmesh:int",userdata_int);   
    //if(version == "1.1")
    mesh.SetUserData("TETmesh:point_id",point_pids);

    mesh.SetUserData("TETmesh:uid_to_group_3D",uid_to_group_3D);
    mesh.SetUserData("TETmesh:uid_to_group_2D",uid_to_group_2D);
    mesh.SetUserData("TETmesh:uid_to_group_1D",uid_to_group_1D);
    mesh.SetUserData("TETmesh:uid_to_group_0D",uid_to_group_0D);


    NgArray<SurfaceElementIndex> surfindices(tris.Size());
    surfindices = -1;

    for(int i=0; i<tris.Size(); i++)
      {
        if(atof(version.c_str()) <= 1.999999)
          {
            if(tris[i]->GetIndex() > 0)
              surfindices[i] = mesh.AddSurfaceElement(*tris[i]);
          }
        else
          {
            if(tris[i]->GetIndex() > 0 &&
               tris[i]->GetIndex() < minId3D)
              {
                tris[i]->SetIndex(tris[i]->GetIndex()-minId2D+1);
                surfindices[i] = mesh.AddSurfaceElement(*tris[i]);
              }
          }
        delete tris[i];
      }

      
    mesh.ClearFaceDescriptors();
    if(atof(version.c_str()) <= 1.999999)
      for(int i = 1; i <= maxId2D; i++)
        mesh.AddFaceDescriptor(FaceDescriptor(i,0,0,0));
    else
      for(int i=minId2D; i<minId3D; i++)
        mesh.AddFaceDescriptor(FaceDescriptor(i,0,0,0));
	

    for(int i=0; i<tetfacedata.Size(); i+=9)
      {
        for(int j=0; j<4; j++)
          {
            SurfaceElementIndex surf = surfindices[tetfacedata[i+2*j]];
	      
            //if(mesh.GetNSE() <= surf)
            if(surf == -1)
              continue;

            if(tetfacedata[i+2*j+1] == 1)
              mesh.GetFaceDescriptor(mesh[surf].GetIndex()).SetDomainOut(tetfacedata[i+8]);
            else
              mesh.GetFaceDescriptor(mesh[surf].GetIndex()).SetDomainIn(tetfacedata[i+8]);
			

            /*
	      int faceind = 0;
	      for(int k=1; k<=mesh.GetNFD(); k++)
              {
              if(mesh.GetFaceDescriptor(k).SurfNr() == mesh[surf].GetIndex())
              faceind = k;
              }
	      if(faceind)
              {
              if(tetfacedata[i+4+j] == 1)
              mesh.GetFaceDescriptor(faceind).SetDomainOut(tetfacedata[i+8]);
              else
              mesh.GetFaceDescriptor(faceind).SetDomainIn(tetfacedata[i+8]);
              }
	      else
              {
              if(tetfacedata[i+4+j] == 1)
              faceind = mesh.AddFaceDescriptor(FaceDescriptor(mesh[surf].GetIndex(),0,tetfacedata[i+8],0));
              else
              faceind = mesh.AddFaceDescriptor(FaceDescriptor(mesh[surf].GetIndex(),tetfacedata[i+8],0,0));
              mesh.GetFaceDescriptor(faceind).SetBCProperty(mesh[surf].GetIndex());
              }
            */
          }

      }
      
    //       NgArray<int> indextodescriptor(maxId2D+1);
		
    //       for(int i=1; i<=mesh.GetNFD(); i++)
    // 	indextodescriptor[mesh.GetFaceDescriptor(i).SurfNr()] = i;
		
		
    //       for(SurfaceElementIndex i=0; i<mesh.GetNSE(); i++)
    // 	mesh[i].SetIndex(indextodescriptor[mesh[i].GetIndex()]);


    for(int i=0; i<segmentdata.Size(); i++)
      {
        Segment seg;

	  
        if((atof(version.c_str()) <= 1.999999 && (*segmentdata[i])[2] > 0) ||
           (atof(version.c_str()) > 1.999999  && (*segmentdata[i])[2] > 0 && (*segmentdata[i])[2] < minId2D))
          {
            seg[0] = (*segmentdata[i])[0];
            seg[1] = (*segmentdata[i])[1];
            seg.edgenr = (*segmentdata[i])[2];
            seg.epgeominfo[0].edgenr = (*segmentdata[i])[2];
            seg.epgeominfo[1].edgenr = (*segmentdata[i])[2];
            seg.si = (*segmentdata[i])[3]-minId2D+1;
            seg.surfnr1 = -1;//(*segmentdata[i])[3];
            seg.surfnr2 = -1;//(*segmentdata[i])[4];
            seg.geominfo[0].trignum = (*segmentdata[i])[5];
            seg.geominfo[1].trignum = (*segmentdata[i])[5];
            mesh.AddSegment(seg);

            seg[0] = (*segmentdata[i])[1];
            seg[1] = (*segmentdata[i])[0];
            seg.si = (*segmentdata[i])[4]-minId2D+1;
            seg.surfnr1 = -1;//(*segmentdata[i])[3];
            seg.surfnr2 = -1;//(*segmentdata[i])[4];
            seg.geominfo[0].trignum = (*segmentdata[i])[6];
            seg.geominfo[1].trignum = (*segmentdata[i])[6];
            mesh.AddSegment(seg);
          }
        delete segmentdata[i];
      }

    /*
      for(int i=mesh.GetNSeg(); i>=1; i--)
      if(mesh.LineSegment(i).epgeominfo[0].edgenr == 0 ||
      mesh.LineSegment(i).epgeominfo[1].edgenr == 0)
      mesh.FullDeleteSegment(i);
    */	
  
    mesh.CalcSurfacesOfNode();
      
  }
}