#include "util.h"
#include "entity.h"
#include "randlvl.h"
#include <vector>

using namespace std;

typedef vector < vertex_t2f_n3f_v3f > triangles;

void add_tri (triangles& t, point ap, point bp, point cp, tex2 uv1, tex2 uv2, tex2 uv3)
{
  vec3 nv = normalize (cross (vec3 (cp.x - bp.x, cp.y - bp.y, cp.z - bp.z),
                              vec3 (ap.x - bp.x, ap.y - bp.y, ap.z - bp.z)));

  t.push_back (vertex_t2f_n3f_v3f (ap, nv, uv1));
  t.push_back (vertex_t2f_n3f_v3f (bp, nv, uv2));
  t.push_back (vertex_t2f_n3f_v3f (cp, nv, uv3));
}

void add_quad (triangles& t, point p1, point p2, point p3, point p4)
{
  add_tri (t, p1, p2, p3, tex2 (0, 0), tex2 (0, 1), tex2 (1, 1));
  add_tri (t, p1, p3, p4, tex2 (0, 0), tex2 (1, 1), tex2 (1, 0));
}

geometry_triangles* mk_cube (point p, vec3 v)
{
  triangles t;

  add_quad (t, p                   , p + vec3 (v.x, 0, 0)  , p + vec3 (v.x, 0, v.z), p + vec3 (0, 0, v.z));
  add_quad (t, p + vec3 (0, 0, v.z), p + vec3 (0, v.y, v.z), p + vec3 (0, v.y, 0)  , p);
  add_quad (t, p + vec3 (0, 0, v.z), p + vec3 (v.x, 0, v.z), p + v                 , p + vec3(0, v.y, v.z));
  add_quad (t, p + vec3 (0, v.y, 0), p + vec3 (0, v.y, v.z), p + v                 , p + vec3(v.x, v.y, 0));
  add_quad (t, p                   , p + vec3 (0, v.y, 0)  , p + vec3 (v.x, v.y, 0), p + vec3(v.x, 0, 0));
  add_quad (t, p + v               , p + vec3 (v.x, 0, v.z), p + vec3 (v.x, 0, 0)  , p + vec3(v.x, v.y, 0));

  geometry_triangles *tri = new geometry_triangles;
  tri->m = testmat;
  tri->set (t);

  return tri;
}

int myrand (float max) {
  return (max * rand () / RAND_MAX);
}

entity *RandomBuilding::draw (int cnt, int max_room, int max_cubes)
{
  geometry_container *objs = new geometry_container;
  for (int i = 0; i < cnt; ++i)
    {
      objs->add (mk_cube (
                  point (myrand (max_room), myrand (max_room), myrand (max_room)), 
                  vec3 (1 + myrand (max_cubes), 1 + myrand (max_cubes), 1 + myrand (max_cubes))
                ));
    }

  return new entity (objs);
}