/******************************************************************************
 *
 * Project:  Interlis 2 Reader
 * Purpose:  Implementation of ILI2Reader class.
 * Author:   Markus Schnider, Sourcepole AG
 *
 ******************************************************************************
 * Copyright (c) 2004, Pirmin Kalberer, Sourcepole AG
 * Copyright (c) 2008-2012, Even Rouault <even dot rouault at spatialys.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 ****************************************************************************/

#include "ili2readerp.h"
#include "ogr_ili2.h"
#include "cpl_conv.h"
#include "cpl_string.h"

#include "ili2reader.h"

using namespace std;

CPL_CVSID("$Id: ili2reader.cpp b1c9c12ad373e40b955162b45d704070d4ebf7b0 2019-06-19 16:50:15 +0200 Even Rouault $")

//
// constants
//
static const char * const ILI2_TID = "TID";
static const XMLCh xmlch_ILI2_TID[] = {'T', 'I', 'D', '\0' };
static const XMLCh ILI2_REF[] = {'R', 'E', 'F', '\0' };

constexpr int ILI2_STRING_TYPE = 0;
constexpr int ILI2_COORD_TYPE = 1;
constexpr int ILI2_ARC_TYPE = 2;
constexpr int ILI2_POLYLINE_TYPE = 4;
constexpr int ILI2_BOUNDARY_TYPE = 8;
constexpr int ILI2_AREA_TYPE = 16; // also SURFACE
constexpr int ILI2_GEOMCOLL_TYPE = 32;

static const char * const ILI2_COORD = "COORD";
static const char * const ILI2_ARC = "ARC";
static const char * const ILI2_POLYLINE = "POLYLINE";
static const char * const ILI2_BOUNDARY = "BOUNDARY";
static const char * const ILI2_AREA = "AREA";
static const char * const ILI2_SURFACE = "SURFACE";

//
// helper functions
//
int cmpStr(string s1, string s2) {

  string::const_iterator p1 = s1.begin();
  string::const_iterator p2 = s2.begin();

  while (p1 != s1.end() && p2 != s2.end()) {
    if (toupper(*p1) != toupper(*p2))
      return (toupper(*p1) < toupper(*p2)) ? -1 : 1;
    ++p1;
    ++p2;
  }

  return (s2.size() == s1.size()) ? 0 :
         (s1.size() < s2.size()) ? -1 : 1;
}

string ltrim(string tmpstr) {
  unsigned int i = 0;
  while (i < tmpstr.length() && (tmpstr[i] == ' ' || tmpstr[i] == '\t' || tmpstr[i] == '\r' || tmpstr[i] == '\n')) ++i;
  return i > 0 ? tmpstr.substr(i, tmpstr.length()-i) : tmpstr;
}

string rtrim(string tmpstr) {
  if (tmpstr.length() == 0) return tmpstr;
  unsigned int i = static_cast<unsigned int>(tmpstr.length()) - 1;
  while (tmpstr[i] == ' ' || tmpstr[i] == '\t' || tmpstr[i] == '\r' || tmpstr[i] == '\n') --i;
  return i < tmpstr.length() - 1 ? tmpstr.substr(0, i+1) : tmpstr;
}

string trim(string tmpstr) {
  tmpstr = ltrim(tmpstr);
  tmpstr = rtrim(tmpstr);
  return tmpstr;
}

static int getGeometryTypeOfElem(DOMElement* elem) {
  int type = ILI2_STRING_TYPE;
  if( elem == nullptr )
      return type;
  char* pszTagName = XMLString::transcode(elem->getTagName());

  if (elem->getNodeType() == DOMNode::ELEMENT_NODE) {
    if (cmpStr(ILI2_COORD, pszTagName) == 0) {
      type = ILI2_COORD_TYPE;
    } else if (cmpStr(ILI2_ARC, pszTagName) == 0) {
      type = ILI2_ARC_TYPE;
    } else if (cmpStr(ILI2_POLYLINE, pszTagName) == 0) {
      type = ILI2_POLYLINE_TYPE;
    } else if (cmpStr(ILI2_BOUNDARY, pszTagName) == 0) {
      type = ILI2_BOUNDARY_TYPE;
    } else if (cmpStr(ILI2_AREA, pszTagName) == 0) {
      type = ILI2_AREA_TYPE;
    } else if (cmpStr(ILI2_SURFACE, pszTagName) == 0) {
      type = ILI2_AREA_TYPE;
    }
  }
  XMLString::release(&pszTagName);
  return type;
}

static char *getObjValue(DOMElement *elem) {
  DOMNode* child = elem->getFirstChild();
  if ((child != nullptr) && (child->getNodeType() == DOMNode::TEXT_NODE))
  {
    return CPLStrdup(transcode(child->getNodeValue()));
  }

  return nullptr;
}

static char *getREFValue(DOMElement *elem) {
  CPLString osREFValue(transcode(elem->getAttribute(ILI2_REF)));
  return CPLStrdup(osREFValue);
}

static OGRPoint *getPoint(DOMElement *elem) {
  // elem -> COORD (or ARC)
  DOMElement *coordElem = dynamic_cast<DOMElement*>(elem->getFirstChild());
  if( coordElem == nullptr )
      return nullptr;
  OGRPoint *pt = new OGRPoint();

  while (coordElem != nullptr) {
    char* pszTagName = XMLString::transcode(coordElem->getTagName());
    char* pszObjValue = getObjValue(coordElem);
    if( pszObjValue )
    {
        if (cmpStr("C1", pszTagName) == 0)
        pt->setX(CPLAtof(pszObjValue));
        else if (cmpStr("C2", pszTagName) == 0)
        pt->setY(CPLAtof(pszObjValue));
        else if (cmpStr("C3", pszTagName) == 0)
        pt->setZ(CPLAtof(pszObjValue));
    }
    CPLFree(pszObjValue);
    XMLString::release(&pszTagName);
    coordElem = dynamic_cast<DOMElement*>(coordElem->getNextSibling());
  }
  pt->flattenTo2D();
  return pt;
}

OGRCircularString *ILI2Reader::getArc(DOMElement *elem) {
  // previous point -> start point
  auto elemPrev = dynamic_cast<DOMElement*>(elem->getPreviousSibling());
  if( elemPrev == nullptr )
      return nullptr;
  OGRPoint *ptStart = getPoint(elemPrev); // COORD or ARC
  if( ptStart == nullptr )
      return nullptr;
  
  // elem -> ARC
  OGRCircularString *arc = new OGRCircularString();
  // end point
  OGRPoint *ptEnd = new OGRPoint();
  // point on the arc
  OGRPoint *ptOnArc = new OGRPoint();
  // double radius = 0; // radius

  DOMElement *arcElem = dynamic_cast<DOMElement*>(elem->getFirstChild());
  while (arcElem != nullptr) {
    char* pszTagName = XMLString::transcode(arcElem->getTagName());
    char* pszObjValue = getObjValue(arcElem);
    if( pszObjValue )
    {
        if (cmpStr("C1", pszTagName) == 0)
        ptEnd->setX(CPLAtof(pszObjValue));
        else if (cmpStr("C2", pszTagName) == 0)
        ptEnd->setY(CPLAtof(pszObjValue));
        else if (cmpStr("C3", pszTagName) == 0)
        ptEnd->setZ(CPLAtof(pszObjValue));
        else if (cmpStr("A1", pszTagName) == 0)
        ptOnArc->setX(CPLAtof(pszObjValue));
        else if (cmpStr("A2", pszTagName) == 0)
        ptOnArc->setY(CPLAtof(pszObjValue));
        else if (cmpStr("A3", pszTagName) == 0)
        ptOnArc->setZ(CPLAtof(pszObjValue));
        else if (cmpStr("R", pszTagName) == 0) {
        // radius = CPLAtof(pszObjValue);
        }
    }
    CPLFree(pszObjValue);
    XMLString::release(&pszTagName);
    arcElem = dynamic_cast<DOMElement*>(arcElem->getNextSibling());
  }
  arc->addPoint(ptStart);
  arc->addPoint(ptOnArc);
  arc->addPoint(ptEnd);
  delete ptStart;
  delete ptOnArc;
  delete ptEnd;
  return arc;
}

static OGRCompoundCurve *getPolyline(DOMElement *elem) {
  // elem -> POLYLINE
  OGRCompoundCurve *ogrCurve = new OGRCompoundCurve();
  OGRLineString *ls = new OGRLineString();

  DOMElement *lineElem = dynamic_cast<DOMElement *>(elem->getFirstChild());
  while (lineElem != nullptr) {
    char* pszTagName = XMLString::transcode(lineElem->getTagName());
    if (cmpStr(ILI2_COORD, pszTagName) == 0)
    {
      OGRPoint* poPoint = getPoint(lineElem);
      if( poPoint )
      {
        ls->addPoint(poPoint);
        delete poPoint;
      }
    }
    else if (cmpStr(ILI2_ARC, pszTagName) == 0) {
      //Finish line and start arc
      if (ls->getNumPoints() > 1) {
        ogrCurve->addCurveDirectly(ls);
        ls = new OGRLineString();
      } else {
        ls->empty();
      }
      OGRCircularString *arc = new OGRCircularString();
      // end point
      OGRPoint *ptEnd = new OGRPoint();
      // point on the arc
      OGRPoint *ptOnArc = new OGRPoint();
      // radius
      // double radius = 0;

      DOMElement *arcElem = dynamic_cast<DOMElement *>(lineElem->getFirstChild());
      while (arcElem != nullptr) {
        char* pszTagName2 = XMLString::transcode(arcElem->getTagName());
        char* pszObjValue = getObjValue(arcElem);
        if( pszObjValue )
        {
            if (cmpStr("C1", pszTagName2) == 0)
            ptEnd->setX(CPLAtof(pszObjValue));
            else if (cmpStr("C2", pszTagName2) == 0)
            ptEnd->setY(CPLAtof(pszObjValue));
            else if (cmpStr("C3", pszTagName2) == 0)
            ptEnd->setZ(CPLAtof(pszObjValue));
            else if (cmpStr("A1", pszTagName2) == 0)
            ptOnArc->setX(CPLAtof(pszObjValue));
            else if (cmpStr("A2", pszTagName2) == 0)
            ptOnArc->setY(CPLAtof(pszObjValue));
            else if (cmpStr("A3", pszTagName2) == 0)
            ptOnArc->setZ(CPLAtof(pszObjValue));
            else if (cmpStr("R", pszTagName2) == 0) {
            // radius = CPLAtof(pszObjValue);
            }
        }
        CPLFree(pszObjValue);
        XMLString::release(&pszTagName2);

        arcElem = dynamic_cast<DOMElement *>(arcElem->getNextSibling());
      }

      auto elemPrev = dynamic_cast<DOMElement *>(lineElem->getPreviousSibling());
      if( elemPrev )
      {
        OGRPoint *ptStart = getPoint(elemPrev); // COORD or ARC
        if( ptStart )
            arc->addPoint(ptStart);
        delete ptStart;
      }
      arc->addPoint(ptOnArc);
      arc->addPoint(ptEnd);
      ogrCurve->addCurveDirectly(arc);

      delete ptEnd;
      delete ptOnArc;
    } /* else { // TODO: StructureValue in Polyline not yet supported
    } */
    XMLString::release(&pszTagName);

    lineElem = dynamic_cast<DOMElement *>(lineElem->getNextSibling());
  }

  if (ls->getNumPoints() > 1) {
    ogrCurve->addCurveDirectly(ls);
  }
  else {
    delete ls;
  }
  return ogrCurve;
}

static OGRCompoundCurve *getBoundary(DOMElement *elem) {

  DOMElement *lineElem = dynamic_cast<DOMElement *>(elem->getFirstChild());
  if (lineElem != nullptr)
  {
    char* pszTagName = XMLString::transcode(lineElem->getTagName());
    if (cmpStr(ILI2_POLYLINE, pszTagName) == 0)
    {
      XMLString::release(&pszTagName);
      return getPolyline(lineElem);
    }
    XMLString::release(&pszTagName);
  }

  return new OGRCompoundCurve();
}

static OGRCurvePolygon *getPolygon(DOMElement *elem) {
  OGRCurvePolygon *pg = new OGRCurvePolygon();

  DOMElement *boundaryElem = dynamic_cast<DOMElement *>(elem->getFirstChild()); // outer boundary
  while (boundaryElem != nullptr) {
    char* pszTagName = XMLString::transcode(boundaryElem->getTagName());
    if (cmpStr(ILI2_BOUNDARY, pszTagName) == 0)
    {
        OGRCompoundCurve* poCC = getBoundary(boundaryElem);
        if( pg->addRingDirectly(poCC) != OGRERR_NONE )
        {
            delete poCC;
        }
    }
    XMLString::release(&pszTagName);
    boundaryElem = dynamic_cast<DOMElement *>(boundaryElem->getNextSibling()); // inner boundaries
  }

  return pg;
}

OGRGeometry *ILI2Reader::getGeometry(DOMElement *elem, int type) {
  OGRGeometryCollection *gm = new OGRGeometryCollection();

  DOMElement *childElem = elem;
  while (childElem != nullptr) {
    char* pszTagName = XMLString::transcode(childElem->getTagName());
    switch (type) {
      case ILI2_COORD_TYPE :
        if (cmpStr(ILI2_COORD, pszTagName) == 0)
        {
          delete gm;
          XMLString::release(&pszTagName);
          return getPoint(childElem);
        }
        break;
      case ILI2_ARC_TYPE :
        // is it possible here? It have to be a ARC or COORD before (getPreviousSibling)
        if (cmpStr(ILI2_ARC, pszTagName) == 0)
        {
          delete gm;
          XMLString::release(&pszTagName);
          return getArc(childElem);
        }
        break;
      case ILI2_POLYLINE_TYPE :
        if (cmpStr(ILI2_POLYLINE, pszTagName) == 0)
        {
          delete gm;
          XMLString::release(&pszTagName);
          return getPolyline(childElem);
        }
        break;
      case ILI2_BOUNDARY_TYPE :
        if (cmpStr(ILI2_BOUNDARY, pszTagName) == 0)
        {
          delete gm;
          XMLString::release(&pszTagName);
          return getPolyline(childElem);
        }
        break;
      case ILI2_AREA_TYPE :
        if ((cmpStr(ILI2_AREA, pszTagName) == 0) ||
          (cmpStr(ILI2_SURFACE, pszTagName) == 0))
        {
          delete gm;
          XMLString::release(&pszTagName);
          return getPolygon(childElem);
        }
        break;
      default :
        if (type >= ILI2_GEOMCOLL_TYPE) {
          int subType = getGeometryTypeOfElem(childElem); //????
          OGRGeometry* poSubGeom = getGeometry(childElem, subType);
          if( poSubGeom )
            gm->addGeometryDirectly(poSubGeom);
        }
        break;
    }
    XMLString::release(&pszTagName);

    // GEOMCOLL
    childElem = dynamic_cast<DOMElement *>(childElem->getNextSibling());
  }

  return gm;
}

int ILI2Reader::ReadModel(ImdReader *poImdReader, const char *modelFilename) {
  poImdReader->ReadModel(modelFilename);
  for (FeatureDefnInfos::const_iterator it = poImdReader->featureDefnInfos.begin(); it != poImdReader->featureDefnInfos.end(); ++it)
  {
    OGRLayer* layer = new OGRILI2Layer(it->GetTableDefnRef(), it->poGeomFieldInfos, nullptr);
    m_listLayer.push_back(layer);
  }
  return 0;
}

//Detect field name of value element
static char* fieldName(DOMElement* elem) {
  DOMNode *node = elem;
  if (getGeometryTypeOfElem(elem))
  {
    int depth = 0; // Depth of value elem node
    for (node = elem; node; node = node->getParentNode()) ++depth;
    //Field name is on level 4
    node = elem;
    for (int d = 0; d<depth-4; ++d) node = node->getParentNode();
  }
  if( node == nullptr )
  {
      CPLError(CE_Failure, CPLE_AssertionFailed, "node == NULL");
      return CPLStrdup("***bug***");
  }
  return CPLStrdup(transcode(node->getNodeName()));
}

void ILI2Reader::setFieldDefn(OGRFeatureDefn *featureDef, DOMElement* elem) {
  int type = 0; 
  //recursively search children
  for (DOMNode *childNode = elem->getFirstChild();
        type == 0 && childNode && childNode->getNodeType() == DOMNode::ELEMENT_NODE;
        childNode = childNode->getNextSibling()) {
    DOMElement* childElem = dynamic_cast<DOMElement*>(childNode);
    CPLAssert(childElem);
    type = getGeometryTypeOfElem(childElem);
    if (type == 0) {
      if (childElem->getFirstChild() && childElem->getFirstChild()->getNodeType() == DOMNode::ELEMENT_NODE) {
        setFieldDefn(featureDef, childElem);
      } else {
        char *fName = fieldName(childElem);
        if (featureDef->GetFieldIndex(fName) == -1) {
          CPLDebug( "OGR_ILI", "AddFieldDefn: %s",fName );
          OGRFieldDefn oFieldDefn(fName, OFTString);
          featureDef->AddFieldDefn(&oFieldDefn);
        }
        CPLFree(fName);
      }
    }
  }
}

void ILI2Reader::SetFieldValues(OGRFeature *feature, DOMElement* elem) {
  int type = 0;
  //recursively search children
  for (DOMNode *childNode = elem->getFirstChild();
        type == 0 && childNode && childNode->getNodeType() == DOMNode::ELEMENT_NODE;
        childNode = childNode->getNextSibling()) {
    DOMElement* childElem = dynamic_cast<DOMElement*>(childNode);
    CPLAssert(childElem);
    type = getGeometryTypeOfElem(childElem);
    if (type == 0) {
      if (childElem->getFirstChild() && childElem->getFirstChild()->getNodeType() == DOMNode::ELEMENT_NODE) {
        SetFieldValues(feature, childElem);
      } else {
        char *fName = fieldName(childElem);
        int fIndex = feature->GetFieldIndex(fName);
        if (fIndex != -1) {
          char * objVal = getObjValue(childElem);
          if (objVal == nullptr)
            objVal = getREFValue(childElem); // only to try
          feature->SetField(fIndex, objVal);
          CPLFree(objVal);
        } else {
          CPLDebug( "OGR_ILI","Attribute '%s' not found", fName);
          m_missAttrs.push_back(fName);
        }
        CPLFree(fName);
      }
    } else {
      char *fName = fieldName(childElem);
      int fIndex = feature->GetGeomFieldIndex(fName);
      OGRGeometry *geom = getGeometry(childElem, type);
      if( geom ) 
      {
        if (fIndex == -1) { // Unknown model
            feature->SetGeometryDirectly(geom);
        } else {
            OGRwkbGeometryType geomType = feature->GetGeomFieldDefnRef(fIndex)->GetType();
            if (geomType == wkbMultiLineString || geomType == wkbPolygon) {
            feature->SetGeomFieldDirectly(fIndex, geom->getLinearGeometry());
            delete geom;
            } else {
            feature->SetGeomFieldDirectly(fIndex, geom);
            }
        }
      }
      CPLFree(fName);
    }
  }
}

//
// ILI2Reader
//
IILI2Reader::~IILI2Reader() {
}

ILI2Reader::ILI2Reader() :
    m_pszFilename(nullptr),
    m_poILI2Handler(nullptr),
    m_poSAXReader(nullptr),
    m_bReadStarted(FALSE),
    m_bXercesInitialized(false)
{
    SetupParser();
}

ILI2Reader::~ILI2Reader() {
    CPLFree( m_pszFilename );

    CleanupParser();

    if( m_bXercesInitialized )
        OGRDeinitializeXerces();

    list<OGRLayer *>::const_iterator layerIt = m_listLayer.begin();
    while (layerIt != m_listLayer.end()) {
        OGRILI2Layer *tmpLayer = (OGRILI2Layer *)*layerIt;
        delete tmpLayer;
        ++layerIt;
    }
}

void ILI2Reader::SetSourceFile( const char *pszFilename ) {
    CPLFree( m_pszFilename );
    m_pszFilename = CPLStrdup( pszFilename );
}

int ILI2Reader::SetupParser() {

    if( !m_bXercesInitialized )
    {
        if( !OGRInitializeXerces() )
            return FALSE;
        m_bXercesInitialized = true;
    }

    // Cleanup any old parser.
    if( m_poSAXReader != nullptr )
        CleanupParser();

    // Create and initialize parser.
    m_poSAXReader = XMLReaderFactory::createXMLReader();

    m_poILI2Handler = new ILI2Handler( this );

    m_poSAXReader->setContentHandler( m_poILI2Handler );
    m_poSAXReader->setErrorHandler( m_poILI2Handler );
    m_poSAXReader->setLexicalHandler( m_poILI2Handler );
    m_poSAXReader->setEntityResolver( m_poILI2Handler );
    m_poSAXReader->setDTDHandler( m_poILI2Handler );

/* No Validation
#if (OGR_ILI2_VALIDATION)
    m_poSAXReader->setFeature(
        XMLString::transcode("http://xml.org/sax/features/validation"), true);
    m_poSAXReader->setFeature(
        XMLString::transcode("http://xml.org/sax/features/namespaces"), true);

    m_poSAXReader->setFeature( XMLUni::fgSAX2CoreNameSpaces, true );
    m_poSAXReader->setFeature( XMLUni::fgXercesSchema, true );

//    m_poSAXReader->setDoSchema(true);
//    m_poSAXReader->setValidationSchemaFullChecking(true);
#else
*/
    XMLCh *tmpCh = XMLString::transcode("http://xml.org/sax/features/validation");
    m_poSAXReader->setFeature(tmpCh, false);
    XMLString::release(&tmpCh);
    tmpCh = XMLString::transcode("http://xml.org/sax/features/namespaces");
    m_poSAXReader->setFeature(tmpCh, false);
    XMLString::release(&tmpCh);
//#endif

    m_bReadStarted = FALSE;

    return TRUE;
}

void ILI2Reader::CleanupParser() {
    if( m_poSAXReader == nullptr )
        return;

    delete m_poSAXReader;
    m_poSAXReader = nullptr;

    delete m_poILI2Handler;
    m_poILI2Handler = nullptr;

    m_bReadStarted = FALSE;
}

int ILI2Reader::SaveClasses( const char *pszFile = nullptr ) {

    // Add logic later to determine reasonable default schema file.
    if( pszFile == nullptr )
        return FALSE;
    
    VSILFILE* fp = VSIFOpenL(pszFile, "rb");
    if( fp == nullptr )
        return FALSE;

    InputSource* is = OGRCreateXercesInputSource(fp);

    // parse and create layers and features
    try
    {
        CPLDebug( "OGR_ILI", "Parsing %s", pszFile);
        m_poSAXReader->parse(*is);
        VSIFCloseL(fp);
        OGRDestroyXercesInputSource(is);
    }
    catch (const DOMException& toCatch)
    {
        // Can happen with createElement() in ILI2Handler::startElement()
        CPLError( CE_Failure, CPLE_AppDefined,
                  "DOMException: %s\n",
                  transcode(toCatch.getMessage()).c_str());
        VSIFCloseL(fp);
        OGRDestroyXercesInputSource(is);
        return FALSE;
    }
    catch (const SAXException& toCatch)
    {
        CPLError( CE_Failure, CPLE_AppDefined,
                  "Parsing failed: %s\n",
                  transcode(toCatch.getMessage()).c_str());
        VSIFCloseL(fp);
        OGRDestroyXercesInputSource(is);
        return FALSE;
    }

  if (!m_missAttrs.empty()) {
    m_missAttrs.sort();
    m_missAttrs.unique();
    string attrs = "";
    list<string>::const_iterator it;
    for (it = m_missAttrs.begin(); it != m_missAttrs.end(); ++it)
      attrs += *it + ", ";

    CPLError( CE_Warning, CPLE_NotSupported,
              "Failed to add new definition to existing layers, attributes not saved: %s", attrs.c_str() );
  }

    return TRUE;
}

list<OGRLayer *> ILI2Reader::GetLayers() {
  return m_listLayer;
}

int ILI2Reader::GetLayerCount() {
  return static_cast<int>(m_listLayer.size());
}

OGRLayer* ILI2Reader::GetLayer(const char* pszName) {
  for (list<OGRLayer *>::reverse_iterator layerIt = m_listLayer.rbegin();
       layerIt != m_listLayer.rend();
       ++layerIt) {
    OGRFeatureDefn *fDef = (*layerIt)->GetLayerDefn();
    if (cmpStr(fDef->GetName(), pszName) == 0) {
      return *layerIt;
    }
  }
  return nullptr;
}

int ILI2Reader::AddFeature(DOMElement *elem) {
  CPLString osName(transcode(elem->getTagName()));
  //CPLDebug( "OGR_ILI", "Reading layer: %s", osName.c_str() );

  // test if this layer exist
  OGRILI2Layer* curLayer = dynamic_cast<OGRILI2Layer*>(GetLayer(osName));
  bool newLayer = (curLayer == nullptr);

  // add a layer
  if (newLayer) {
    CPLDebug( "OGR_ILI", "Adding layer: %s", osName.c_str() );
    OGRFeatureDefn* poFeatureDefn = new OGRFeatureDefn(osName);
    poFeatureDefn->SetGeomType( wkbUnknown );
    GeomFieldInfos oGeomFieldInfos;
    curLayer = new OGRILI2Layer(poFeatureDefn, oGeomFieldInfos, nullptr);
    m_listLayer.push_back(curLayer);
  }

  // the feature and field definition
  OGRFeatureDefn *featureDef = curLayer->GetLayerDefn();
  if (newLayer) {
    // add TID field
    OGRFieldDefn ofieldDefn (ILI2_TID, OFTString);
    featureDef->AddFieldDefn(&ofieldDefn);

    setFieldDefn(featureDef, elem);
  }

  // add the features
  OGRFeature *feature = new OGRFeature(featureDef);

  // assign TID
  int fIndex = feature->GetFieldIndex(ILI2_TID);
  if (fIndex != -1) {
      feature->SetField(fIndex, transcode(elem->getAttribute(xmlch_ILI2_TID)).c_str());
  } else {
      CPLDebug( "OGR_ILI","'%s' not found", ILI2_TID);
  }

  SetFieldValues(feature, elem);
  curLayer->AddFeature(feature);

  return 0;
}

IILI2Reader *CreateILI2Reader() {
    return new ILI2Reader();
}

void DestroyILI2Reader(IILI2Reader* reader)
{
    if (reader)
        delete reader;
}