#include "libs.h"
#include "star.h"
#include "l3d.h"

Star::Star(StarSystem::BodyType type): Body() {
  this->type = type;
  radius  = 6378135.0;
  pos     = vector3d(0,0,0);
}

vector3d Star::GetPosition(void) {
  return pos;
}

void Star::SetPosition(vector3d p) {
  pos = p;
}

static void DrawCorona(double rad, vector3d& pos, const float col[3]) {
  glPushMatrix();
  /* Face the camera damnit! */
  vector3d dir = vector3d::Normalize(pos);
  vector3d d2  = vector3d(0, 1, 0);
  vector3d d3  = vector3d::Cross(dir, d2);
  d3.Normalize();
  d2 = vector3d::Cross(dir, d3);
  matrix4x4d rot = matrix4x4d::MakeRotMatrix(d3, d2, dir);
  glMultMatrixd(&rot[0]);

  glEnable(GL_BLEND);
  glDisable(GL_CULL_FACE);
  glBegin(GL_TRIANGLE_FAN);
    glColor4f(col[0], col[1], col[2], 1);
    glVertex3f(0, 0, 0);
    glColor4f(0, 0, 0, 0);
    for(float ang = 0; ang < 2*M_PI; ang += 0.2) {
      glVertex3f(rad*sin(ang), rad*cos(ang), 0);
    }
    glVertex3f(0, rad, 0);
  glEnd();
  glEnable(GL_CULL_FACE);
  glDisable(GL_BLEND);
  glPopMatrix();
}

void Star::Render(const Frame* a_camFrame) {
  glDisable(GL_LIGHTING);
  glDisable(GL_DEPTH_TEST);
  glPushMatrix();

  /* TODO duplicates code from Planet.cpp, not good. */
  double rad = radius;
  vector3d fpos = GetPositionRelTo(a_camFrame);
  double len = fpos.Length();

  while(len > 1000.0f) {
    rad *= 0.25;
    fpos = 0.25*fpos;
    len *= 0.25;
  }
  
  glTranslatef(fpos.x, fpos.y, fpos.z);
  
  glColor3fv(StarSystem::starColors[type]);
  gluSphere(L3D::gluQuadric, rad, 100, 100);
  DrawCorona(rad*4, fpos, StarSystem::starColors[type]);
  glPopMatrix();
  glEnable(GL_DEPTH_TEST);
  glEnable(GL_LIGHTING);
}