class Bumper
{
  private float ri, ro, bounciness;
  private Particle p;
  private Particle[] outer;
  private color c;
  
  Bumper()
  {
    c = color(255);
    ri = 30;
    ro = 40;
    bounciness = 10;
    outer = new Particle[7];
    // make the center
    p = phys.makeParticle(1, random(45, width-45), random(45, height-45), 0);
    p.makeFixed();
    // make the particles for the outer ring
    outer[0] = phys.makeParticle(1, x()+ro*-0.98f, y()+ro*-0.198997487f, 0);
    outer[1] = phys.makeParticle(1, x()+ro*-0.45f, y()+ro*-0.893028554f, 0);
    outer[2] = phys.makeParticle(1, x()+ro*0.45f, y()+ro*-0.893028554f, 0);
    outer[3] = phys.makeParticle(1, x()+ro*0.98f, y()+ro*-0.198997487f, 0);
    outer[4] = phys.makeParticle(1, x()+ro*0.8f, y()+ro*0.6f, 0);
    outer[5] = phys.makeParticle(1, x(), y()+ro, 0);
    outer[6] = phys.makeParticle(1, x()+ro*-0.8f, y()+ro*0.6f, 0);
    // make the springs connecting the inner and outer rings
    for (int i = 0; i < outer.length; i++)
    {
      phys.makeSpring(p, outer[i], 1, 0.2, ro);
    }
    phys.makeSpring(outer[0], outer[1], 1, 1, dOut(0, 1));
    phys.makeSpring(outer[1], outer[2], 1, 1, dOut(1, 2));
    phys.makeSpring(outer[2], outer[3], 1, 1, dOut(2, 3));
    phys.makeSpring(outer[3], outer[4], 1, 1, dOut(3, 4));
    phys.makeSpring(outer[4], outer[5], 1, 1, dOut(4, 5));
    phys.makeSpring(outer[5], outer[6], 1, 1, dOut(5, 6));
    phys.makeSpring(outer[6], outer[0], 1, 1, dOut(6, 0));
  }
  
  void interact(Pulser puls)
  {
    float d = dist(x(), y(), puls.x(), puls.y());
    float bs = 40;
    if ( d < ro + puls.radius() )
    {
      float dx = puls.x() - x();
      float dy = puls.y() - y();
      for (int i = 0; i < outer.length; i++)
      {
        float ds = dist(x(), y(), outer[i].position().x(), outer[i].position().y());
        outer[i].setVelocity( bounciness * ((x() - outer[i].position().x())/ds), 
                              bounciness * ((y() - outer[i].position().y())/ds), 0);
      }
      puls.setVelocity(bs*(dx/d), bs*(dy/d));
      if ( !puls.isAttached() )
      {
        switch( puls.type )
        {
          case KICK: score.addScore(75, x(), y()); break;
          case SNARE: score.addScore(100, x(), y()); break;
          case HAT: score.addScore(125, x(), y()); break;
        }
      }
    }
  }
  
  void interact(Deathskull sk)
  {
    float d = dist(x(), y(), sk.x(), sk.y());
    float bs = 40;
    if ( d < ro + sk.radius() )
    {
      float dx = sk.x() - x();
      float dy = sk.y() - y();
      for (int i = 0; i < outer.length; i++)
      {
        float ds = dist(x(), y(), outer[i].position().x(), outer[i].position().y());
        outer[i].setVelocity( bounciness * ((x() - outer[i].position().x())/ds), 
                              bounciness * ((y() - outer[i].position().y())/ds), 0);
      }
      sk.addVelocity(bs*(dx/d), bs*(dy/d));
    }
  }
  
  void interact(Player pl)
  {
    float d = dist(x(), y(), pl.x(), pl.y());
    float bs = 40/pl.mass();
    if ( d < ro + pl.radius() )
    {
      float dx = pl.x() - x();
      float dy = pl.y() - y();
      for (int i = 0; i < outer.length; i++)
      {
        float ds = dist(x(), y(), outer[i].position().x(), outer[i].position().y());
        outer[i].setVelocity( bounciness * ((x() - outer[i].position().x())/ds), 
                              bounciness * ((y() - outer[i].position().y())/ds), 0);
      }
      pl.addVelocity(bs*(dx/d), bs*(dy/d));
    }
  }
  
  float x()
  {
    return p.position().x();
  }
  
  float y()
  {
    return p.position().y();
  }
  
  float radius()
  {
    return ro;
  }
  
  float dOut(int i, int j)
  {
    return dist(outer[i].position().x(), outer[i].position().y(), 
                outer[j].position().x(), outer[j].position().y());
  }
  
  void render()
  {
    noFill();
    stroke(c);
    sept(ri, x(), y());
    beginShape();
    for (int i = 0; i < outer.length; i++)
    {
      vertex(outer[i].position().x(), outer[i].position().y());
    }
    endShape(CLOSE);
  }
}