#ifndef ENTITY_H
#define ENTITY_H

#include <GL/gl.h>

#include <vector>

#include "util.h"
#include "oct.h"
#include "view.h"

using namespace std;

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

  virtual void update ();
  virtual void show () { world.add (this); };
  void hide ();
  void display (draw_context &ctx);
  virtual void draw (draw_context &ctx) = 0;

  entity_base ();
  virtual ~entity_base ();
};

struct entity_container : entity_base, protected vector<entity_base *> {
  void add (entity_base *e)
  {
    push_back (e);
    e->parent = this;
    update ();
  }

  void update ();
  void show ();
  void draw (draw_context &ctx);
  ~entity_container ();
};

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

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

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

  entity_base *content () { return e; };

  void update ();
  void show ();
  void draw (draw_context &ctx);
  ~entity_filter ();
};

struct entity : entity_filter {
};

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

struct vertex2d {
  point p; // vertex
  vec3  n; // normal
  texc  t; // texture

  vertex2d () { };
  vertex2d (point p, vec3 n, texc t = texc()) : p(p), n(n), t(t) { };
};

struct entity_opengl : entity_base {
  GLuint list;

  entity_opengl ();
  ~entity_opengl ();
};

template<GLenum type>
struct entity_opengl1d : entity_opengl, vector<vertex1d> {
  void update ();
  void draw (draw_context &ctx);
};

template<GLenum type>
struct entity_opengl2d : entity_opengl {
  material m;

  void set (const vector<vertex2d> &v);
  void draw (draw_context &ctx);
};

typedef entity_opengl1d<GL_POINTS>         entity_points;
typedef entity_opengl1d<GL_LINES>          entity_lines;
typedef entity_opengl1d<GL_LINE_STRIP>     entity_line_strip;
typedef entity_opengl1d<GL_LINE_LOOP>      entity_line_loop;
typedef entity_opengl2d<GL_TRIANGLES>      entity_triangles;
typedef entity_opengl2d<GL_TRIANGLE_STRIP> entity_triangle_strip;
typedef entity_opengl2d<GL_TRIANGLE_FAN>   entity_triangle_fan;
typedef entity_opengl2d<GL_QUADS>          entity_quads;
typedef entity_opengl2d<GL_QUAD_STRIP>     entity_quad_strip;
typedef entity_opengl2d<GL_POLYGON>        entity_polygon;

struct entity_transform : entity_filter {
protected:
  matrix m;
  void renormalize ();
public:

  entity_transform ();

  void update ();
  void show ();
  void draw (draw_context &ctx);
  void set_matrix (const matrix &xfrm);
  void update (const matrix &xfrm);
};

struct entity_anim : entity_transform {
  GLfloat vx, vy, vz;
  void draw (draw_context &ctx);
};

#endif