#ifndef ENTITY_H
#define ENTITY_H

#include <GL/gl.h>

#include <vector>

#include "oct.h"

using namespace std;

typedef unsigned int soffs; // 32 bit
const soffs soffs_max = 1UL << 31;

#define GLFLOAT_MAX 1e30
#define GLFLOAT_MIN -1e30

struct sector {
  soffs x, y, z;
};

struct point {
  GLfloat x, y, z;
};

struct colour {
  GLfloat r, g, b;
};

struct vect {
  GLfloat x, y, z;
};

struct texc {
  GLfloat u, v;
};

struct box {
  point a, b;

  void reset ()
  {
    a.x = a.y = a.z = GLFLOAT_MAX;
    b.x = b.y = b.z = GLFLOAT_MIN;
  }

  void add (const box &o);
};

struct entity_base {
  struct entity_base *parent;
  vector<octant *> o;
  box bbox;

  virtual void update_bbox ();
  virtual void show (const sector &sec) { };
  void hide ();
  virtual void draw () = 0;
  virtual ~entity_base ()
  {
    hide ();
  };
};

struct entity_container : entity_base, protected vector<entity_base *> {
  void update_bbox ();
  void show (const sector &sec);
  void draw ();
  ~entity_container ();
};

struct entity_filter : entity_base {
protected:
  entity_base *e;
public:

  void set (entity_base *e)
  {
    this->e = e;
    e->parent = this;
  }

  void remove ()
  {
    this->e->parent = 0;
    this->e = 0;
  }

  entity_base *content () { return e; };

  void update_bbox ();
  void show (const sector &sec);
  void draw ();
  ~entity_filter ();
};

struct entity : entity_filter {
  sector sec;

  void show (const sector &sec);
  void draw ();
};

struct entity_affine : entity_filter {
  //matrix m;
};

struct vertex1d {
  point  v; // vertex
  colour c; // colour
};

struct vertex2d {
  point  v; // vertex
  colour c; // colour
  vect   n; // normal
  texc   t; // texture
};

template<GLenum type>
struct entity_opengl1d : entity_base, vector<vertex1d> {
  void update_bbox ();
  void show (const sector &sec);
  void draw ();
};

template<GLenum type>
struct entity_opengl2d : entity_base, vector<vertex2d> {
  void update_bbox ();
  void show (const sector &sec);
  void draw ();
};

typedef entity_opengl1d<GL_POINTS>         entity_points;
typedef entity_opengl1d<GL_LINES>          entity_lines;
typedef entity_opengl1d<GL_LINE_STRIP>     entity_linestrip;
typedef entity_opengl1d<GL_LINE_LOOP>      entity_lineloop;
typedef entity_opengl2d<GL_TRIANGLES>      entity_triangles;
typedef entity_opengl2d<GL_TRIANGLE_STRIP> entity_trianglestrip;
typedef entity_opengl2d<GL_TRIANGLE_FAN>   entity_trianglefan;
typedef entity_opengl2d<GL_QUADS>          entity_quads;
typedef entity_opengl2d<GL_QUAD_STRIP>     entity_quad_strip;
typedef entity_opengl2d<GL_POLYGON>        entity_polygon;

#endif