#ifndef ENGINE_H
#define ENGINE_H

#include <GL/glew.h>
#include <GLFW/glfw3.h>
#include "ShaderProgram.h"
#include "Texture2D.h"
#include <map>
#include <string>
#include <vector>

#define NBCALLBACKS 1

typedef void (*KeyCallback)(GLFWwindow* window, int key, int scancode, int action, int mods);

struct Object3D {
  Texture2D texture;
  GLuint VBO;
  GLuint VAO;
};

typedef std::map<std::string,Object3D> Objects3D;

static bool gWireframe = false;

namespace djalim {

  class OpenGlEngine{

    public:

      void start();
      OpenGlEngine( const char* title, int width, int height);
      ~OpenGlEngine();

      GLFWwindow* window;
      double previousSeconds = 0.0;
      double elapsedSeconds;
      int frameCount = 0;
      std::map<std::string,Texture2D> textures;
      ShaderProgram shaderProgram;

      Objects3D objects;
      
      unsigned int VBO;
      unsigned int VAO;
      
      bool gWireframe = false;

      void onUpdate();
      void loadHints();
      void createObject(std::string name, std::string textures, std::vector<float>& vertices);
      void loadCallbacks();
      void showFps();
      void onCreate();
      void onDestroy();
  };
}

#endif // ENGINE_H