pair<GLuint, int> Utils::Loader::loadOBJ(char* filename) {
    stringstream ss;
    ss << "res/data/" << filename << ".obj";

    ifstream file(ss.str().c_str(), ios::in | ios::binary);
    if (!file) {
        return pair<GLuint, int>(0, 0);
    }

    bool hitVertices = false;
    int verticesNum = 0;

    char temp = file.peek();
    while (temp != 'v' && temp != -1) {
        file.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
        temp = file.peek();
    }

    int startPos = file.tellg();
    cout << startPos << endl;

    while (file.get() == 'v') {
        if (file.get() != ' ') break;
        file.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
        verticesNum++;
    }

    float* vertices;
    vertices = new float[verticesNum*3];
    int current = 0;

    file.seekg(startPos);

    while (file.get() == 'v') {
        if (file.get() != ' ') break;
        stringstream ss;
        char n = 0;
        for (int i = 0; i < 3; i++) {
            n = file.get();
            while (n != ' ' && n != '\n') {
                ss << n;
                n = file.get();
            }
            vertices[current++] = atof(ss.str().c_str());
            ss.str("");
        }
    }

    file.close();

    GLuint vao;
    glGenVertexArrays(1, &vao);
    glBindVertexArray(vao);

    GLuint vbo;
    glGenBuffers(1, &vbo);
    glBindBuffer(GL_ARRAY_BUFFER, vbo);

    glEnableVertexAttribArray(0);
    glBufferData(GL_ARRAY_BUFFER, verticesNum * 3 * sizeof(float), vertices, GL_STATIC_DRAW);

    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(float) * 3, (void*)0);
    glBindVertexArray(0);

    delete[] vertices;
    return pair<GLuint, int>(vao, verticesNum);
}