chicken simulator

/* TODO: minimum viable product, is just a console.log version before a DOM version.
add chicken images, onamatopia's, sounds & egg spawns.
*/
var chickPic = new Image("http://www.clker.com/cliparts/Q/7/U/E/h/1/white-chicken-hi.png");
var eggPic = new Image("http://www.pd4pic.com/images/brown-food-cartoon-eggs-egg-breakfast-chicken.png");

// function constructor
function Chicken(eggs){
  this.chicken = chickPic;
  this.eggs = eggs;
  this.egg = eggPic;
}

function Farmer(){

}

Chicken.prototype.sound = function(){
  console.log("baghKURR!");
}

// chicken simulator
var sim = {
  init: function(){
    this.chickens = [];
    this.weekNo = 1;
    this.production; // number of eggs in week x
    // check production every week
    var self = this;
    this.weekly = window.setInterval(function(){
      self.perWeek();
    }, 5000);



  },

  spawn: function(){
    var randomNumber;


    // Create a bunch of chickens.
    for (var i = 0; i < 10; i++) {
      randomNumber = Math.floor(Math.random() * 10);
      this.chickens.push(new Chicken(randomNumber));
      this.production += randomNumber;

      if(Math.floor(Math.random() * 2)){
        // this.chickens[i].sound();
      }
    }
    console.log(this.chickens);
  },

  perWeek: function(x){
    // timer: every week check chicken production then kill chickens.

    // reset
    this.production = 0;
    this.chickens.length = 0;

    console.log("week " + this.weekNo);
    this.weekNo++;

    this.spawn();
    console.log("this week the chickens produced " + this.production + " eggs..");

  }
};

sim.init();