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/* ----------------------------------------------------------------------- *

 * This file is part of GEL, http://www.imm.dtu.dk/GEL

 * Copyright (C) the authors and DTU Informatics

 * For license and list of authors, see ../../doc/intro.pdf

 * ----------------------------------------------------------------------- */

#include "obj_save.h"

#include <fstream>

#include <iostream>

#include <string>

#include <vector>

#include "../CGLA/Vec3f.h"

#include "Manifold.h"

#include "AttributeVector.h"

namespace HMesh

{

    using namespace std;

    using namespace CGLA;

    bool obj_save(const string& filename, Manifold& m)

    {

        ofstream os(filename.data());

        if(os.bad())

            return false;

        VertexAttributeVector<int> vmap;

        int k = 0;

        for(VertexIDIterator v = m.vertices_begin(); v != m.vertices_end(); ++v){

            Vec3d p = m.pos(*v);

            os << "v "<< p[0] << " " << p[1] << " " << p[2] << "\n";

            vmap[*v] = k++;

        }

        for(FaceIDIterator f = m.faces_begin(); f != m.faces_end(); ++f){        

            vector<int> verts;

            for(Walker w = m.walker(*f); !w.full_circle(); w = w.circulate_face_ccw()){

                int idx = vmap[w.vertex()];			

                assert(static_cast<size_t>(idx) < m.no_vertices());

                // move subscript range from 0..size-1 to 1..size according to OBJ standards

                verts.push_back(idx + 1);

            }

			os << "f ";

            for(size_t i = 0; i < verts.size() ; ++i){

                os << verts[i] << " ";

            }

			os<<endl;

        }

        return true;

    }

}