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#include "obj_save.h"

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

#include <CGLA/Vec3f.h>

#include "Manifold.h"
#include "VertexHandle.h"
#include "FaceHandle.h"
#include "FaceCirculator.h"

namespace HMesh
{
    using std::string;
    using std::ofstream;
    using std::vector;
    using CGLA::Vec3f;
        
        bool obj_save(const string& filename, Manifold& m)
        {
                ofstream os(filename.data());
        if(os.bad()){
            return false;
        }
        
        //easy way to avoid skipping indice numbers
        Manifold m1 = m;
        m1.cleanup();

        for(VertexHandle v = m1.vertices_begin(); v != m1.vertices_end(); ++v){
                        Vec3f p = v.get().pos;
                        os << "v "<< p[0] << " " << p[1] << " " << p[2] << "\n";       
                }
        for(FaceHandle f = m1.faces_begin(); f != m1.faces_end(); ++f){        
                    vector<Vidx> verts;
                    for(FaceCirculator fc(f); !fc.end(); ++fc){
                            Vidx vertex_idx = fc.vertex().get_idx();                    
                assert(vertex_idx < m1.no_vertices());
                // adding one to move subscript range from 0..size-1 to 1..size
                                verts.push_back(vertex_idx + 1);
                    }
                    for(uint i = 1; i < (verts.size()-1) ; ++i){
                            os << "f ";
                            os << verts[0] << " " << verts[i] << " " << verts[i+1] << "\n";
                    }
                }
                return true;
        }
        
}