#ifndef WFOBJ_H
#define WFOBJ_H

#include <GL/gl.h>
#include <vector>
#include <string>
#include <map>

class WFObj
{
public:
    /* types */
    typedef bool (*loadfile_t)(const char *fname, Buffer *buff);
    typedef GLuint (*loadtexture_t)(const char *fname);

    class Buffer
    {
        public:
            uint8_t *data;
            size_t length;
    };

    class WFMtl
    {
        public:
            WFMtl(WFObj * obj) { m_obj = obj; }
            bool load(const FileLoader::Path & path);
            void renderBegin(const std::string & mtlname,
                    bool doTextureInfo = true,
                    bool enableBlending = false);
            void renderEnd(const std::string & mtlname,
                    bool doTextureInfo = true,
                    bool enableBlending = false);

        protected:
            /* methods */
            void clear();
            void processInputLine(const std::string & input);
            void pushAttributes();
            bool load(std::istream & istr, unsigned int size);

            /* variables */
            std::map< std::string, std::vector< std::vector<std::string> > > m_data;
            std::string m_currentMaterialName;
            bool m_attributesPushed;
            FileLoader::Path m_path;
            WFObj * m_obj;
    };

    enum { VERTEX, VERTEX_TEXTURE, VERTEX_NORMAL, VERTEX_TYPES };

    /* constructors */
    WFObj(loadfile_t lf = NULL, loadtexture_t lt = NULL);
    ~WFObj();

    /* methods */
    bool load(const char *fname);
    bool load(const Buffer &buff);
    const float * const getAABB() { return m_aabb; }

protected:
    /* types */
    class Vertex
    {
        public:
            float operator[](int idx) const { return data[idx]; }
            float & operator[](int idx) { return data[idx]; }
            float * getData() { return data; }
        private:
            float data[4];
    };

    class VertexRef
    {
        public:
            VertexRef() : vertex(0), texture(0), normal(0) {}
            int vertex;
            int texture;
            int normal;
    };

    class Face
    {
        public:
            VertexRef vertices[3];
    };

    /* methods */
    void clear();
    void processInputLine(const std::string & input);
    Vertex readVertex(const std::vector<std::string> & parts);
    std::vector<Face> readFaces(const std::vector<std::string> & parts);
    VertexRef readVertexRef(const std::string ref);
    void updateAABB(const float * const vertex);
    static Buffer loadfile(const char *path);
    std::string getLine(const Buff & buff, size_t idx, size_t *update_idx);

    /* variables */
    std::vector<Vector> m_vertices[VERTEX_TYPES];
    std::map< std::string, std::vector< Face > > m_faces;
    FileLoader::Path m_path;
    float m_aabb[6];
    loadfile_t m_loadfile;
    loadtexture_t m_loadtexture;
    std::string m_current_material_name;
};

#endif