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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <iostream>
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#if defined(_MSC_VER)
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#include <io.h>
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#else
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#include <unistd.h>
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#endif
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#include <expat.h>
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#include "CGLA/CGLA.h"
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#include "Util/Timer.h"
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#include "Util/Parse.h"
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#include "x3d_load.h"
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using namespace std;
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using namespace CGLA;
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using namespace Util;
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using namespace IMesh;
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namespace IMeshUtil
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{
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  namespace
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  {
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		TriMeshBuilder* bldr;
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  }
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  void startElement(void *userData, const char *name, const char **atts)
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  {
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    if (strcmp(name,"IndexedFaceSet")==0)
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      {
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				int j=0;
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				for(j=0; atts[j]!=0; ++j)
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					{
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						if (strcmp(atts[j],"coordIndex")==0)
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							{
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								vector<int> coord_index;
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								parse(atts[++j],coord_index);
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								int tri=0;
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								Vec3i face;
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								for(int i=0;i<coord_index.size();i++)
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									{
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										if (coord_index[i]==-1)
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											{
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												tri=0;
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												continue;
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											}
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										switch(tri)
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											{
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											case 0:
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												face[tri] = coord_index[i];
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												tri++;
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												break;
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											case 1:
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												face[tri] = coord_index[i];
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												tri++;
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												break;
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											case 2:
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												face[tri] = coord_index[i];
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												tri++;
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												bldr->add_face(face);
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												break;
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											default:
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												/* This is not a triangle.
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													 We perform a super-naive triangulation. */
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												face[0] = coord_index[i-1];
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												face[1] = coord_index[i];
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												face[2] = coord_index[i-tri];
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												bldr->add_face(face);
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												tri++;
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												break;
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											}
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									}
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							}
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				}
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			}
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		else if (strcmp(name,"Shape")==0)
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      {
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				cout << "Found shape" << endl;
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      }
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    else if (strcmp(name,"Coordinate")==0)
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      {
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				int j=0;
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				for (j=0; atts[j]!=0; ++j)
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					{
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						if (strcmp(atts[j],"point")==0)
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							{
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								vector<Vec3f> vertices;
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								parse(atts[++j],vertices);
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								for(int i=0;i<vertices.size();++i)
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									bldr->add_vpos(vertices[i]);
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							}
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					}
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			}
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	}
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  void endElement(void *userData, const char *name)
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  {
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    if (strcmp(name,"Shape")==0)
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      {
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				cout << "Shape ends" << endl;
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      }
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  }
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  bool x3d_load(const std::string& filename, TriMeshBuilder& builder)
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  {
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		bldr = &builder;
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		builder.clear();
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    Util::Timer tim;
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    tim.start();
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    std::string baseurl;
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#define FIND_LAST_OF(F,C) (int)(F.find_last_of(C) == string::npos ? -1 : F.find_last_of(C))
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    int idx = max(FIND_LAST_OF(filename, "\\"), FIND_LAST_OF(filename, "/"));
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#undef FIND_LAST_OF
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    if(idx != -1)
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      baseurl = std::string(filename.substr(0, idx+1));
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    XML_Parser parser = XML_ParserCreate(NULL);
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    int done=0;
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    XML_SetElementHandler(parser, startElement, endElement);
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    int in;
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    if ((in=open(filename.data(),O_RDONLY)) == -1) {
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      cout << "Error. "<<  filename << " not found" << endl;
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      assert(0);
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      return false;
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    }
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    struct stat stat_buf;
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    fstat(in, &stat_buf);
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    const int BUF_SIZE = CGLA::s_min(5000000, static_cast<int>(stat_buf.st_size));
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    char* buf2 = new char[BUF_SIZE];
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    size_t len;
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    do {
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      len = read(in, buf2, BUF_SIZE);
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      if (len!=BUF_SIZE)
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				done=1;
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      if (!XML_Parse(parser, buf2, len, done)) {
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				cerr << "%s at line %d\n"
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						 << XML_ErrorString(XML_GetErrorCode(parser))
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						 << XML_GetCurrentLineNumber(parser);
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				assert(0);
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				return false;
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      }
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    } while (!done);
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    close(in);
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    XML_ParserFree(parser);
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    delete buf2;
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    cout << " Loading took " << tim.get_secs() << endl;
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    return true;
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  }
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}