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/*===================================================*
 *                                                   *
 *    Event Model                                    *
 *                                                   *
 *                                                   *
 *  USAGE:                                           *
 *                                                   *
 *  Event.bind(class, event, name, function);        *
 *                                                   *
 *    This binds an event function to the system     *
 *                                                   *
 *  Event.unbind(class, event, name);                *
 *                                                   *
 *    This unbinds an event function from the        *
 *    system                                         *
 *                                                   *
 *  Event.change(class, event, name, function);      *
 *                                                   *
 *    This changes the function run                  *
 *                                                   *
 *  Event.trigger(class, event, [args]);             *
 *                                                   *
 *    This calls all the functions registered to the *
 *    event in the order registered.                 *
 *                                                   *
**===================================================*/


var Event =  window.Event = {
  events: {
    // storage var.
  },

  trigger: function(klass, name, arg){
    if(this.events[klass]){
      if(this.events[klass][name]){
        for(var i in this.events[klass][name]){
          this.events[klass][name][i](arg);
        }
      }
    }
  },
  bind: function(klass, event, name, fn){
    if(!this.events[klass]){
        this.events[klass] = {};
    }
    if(!this.events[klass][event]){
        this.events[klass][event] = {};
    }
    if(!this.events[klass][event][name]){
        this.events[klass][event][name] = fn;
    }
  },
  unbind: function(klass, event, name){
    if(this.events[klass]){
      if(this.events[klass][event]){
        if(this.events[klass][event][name]){
          delete this.events[klass][event][name]
        }
        if(this.events[klass][event].length == 0){
          delete this.events[klass][event];
        }
        if(this.events[klass].length == 0){
          delete this.events[klass];
        }
      }
    }
  },
  change: function(klass, event, name, fn){
    if(this.events[klass] && this.events[klass][event] && this.events[klass][event][name]){
      this.events[klass][event][name] = fn;
    }else{
      this.bind(klass, event, name, fn);
    }
  }

};