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/*
* Written by Christian Thode Larsen 2009-2010
* Contact: thode2d@gmail.com
* Based on original work by J. Andreas Baerentzen
* Inspired by OpenMesh (www.openmesh.org)
*/

#include "x3d_load.h"

#include <iostream>
#include <vector>
#include <string>

#include <CGLA/Vec3f.h>
#include <Util/Timer.h>
#include <Util/Parse.h>
#include <Util/XmlParser.h>

#include "Manifold.h"

namespace HMesh
{
    using std::cout;
    using std::endl;
    using std::vector;
    using std::string;

    using CGLA::Vec3f;
    using CGLA::s_max;

    using namespace Util;

    namespace
    {
        vector<IndexType> faces;
        vector<IndexType> indices;
        vector<Vec3f> vertices;

        void coord_index_to_face_vec(const vector<int>& coord_index, vector<IndexType>& faces, vector<IndexType>& indices)
        {
            IndexType k = 0;
            for(IndexType i = 0; i < coord_index.size(); ++i){
                int idx = coord_index[i];
                if (idx == -1) {
                    faces.push_back(k);
                    k=0;
                }
                else{
                    indices.push_back(idx);
                    ++k;
                }
            }
        }
    }

    void handle_Shape(XmlElement& elem)
    {
        cout << "Found Shape" << endl;
        elem.process_elements();
        cout << "Shape ends" << endl;                           
    }

    void handle_IndexedFaceSet(XmlElement& elem)
    {
        cout << "Found IndexedFaceSet" << endl;
        vector<int> coord_index;
        parse(elem.atts["coordIndex"].c_str(), coord_index);
        coord_index_to_face_vec(coord_index, faces, indices);
        elem.process_elements();
        cout << "IndexedFaceSet ends" << endl;
    }

    void handle_Coordinate(XmlElement& elem)
    {
        parse(elem.atts["point"].c_str(), vertices);
    }

    int find_last_of(const string& F, const string& C)
    {
        IndexType pos = F.find_last_of(C);
        if (pos == string::npos) 
            return -1;
        return pos;
    }

    bool x3d_load(const string& filename, Manifold& m) 
    {
        faces.clear();
        indices.clear();
        vertices.clear();

        Timer tim;
        tim.start();

        string baseurl;
        int idx = s_max(find_last_of(filename, "\\"), 
                        find_last_of(filename, "/"));

        if(idx != -1)
          baseurl = string(filename.substr(0, idx+1));

        XmlDoc x3d_doc(filename.c_str());
        x3d_doc.add_handler("Shape", handle_Shape);    
        x3d_doc.add_handler("IndexedFaceSet", handle_IndexedFaceSet);
        x3d_doc.add_handler("Coordinate", handle_Coordinate);
        x3d_doc.process_elements();
        x3d_doc.close();

        m.build(vertices.size(), 
                reinterpret_cast<float*>(&vertices[0]), 
                faces.size(), 
                &faces[0], 
                &indices[0]);

        cout << " Loading took " << tim.get_secs() << endl;
        return true;
    }
}