module OnIdle

  def on_idle(timeout, options, wakeoptions)
    timeout *= 1000
    remote = remote_function(options)
    wakeremote = remote_function(wakeoptions)
    javascript_tag("
    var alarm = {
      remind: function() {
        this.idle = 1;
        #{remote} ;
        delete this.timeoutID;
        this.setup(this.ms * 2);
      },

      setup: function(ms) {
        this.cancel();
        var self = this;
        self.ms = ms;
        this.timeoutID = window.setTimeout(function(msg) {self.remind();}, ms);
      },

      wake: function() {
        if (this.idle == 1) {
           #{wakeremote} ;
        }
        this.idle = 0;
      },

      cancel: function() {
        if(typeof this.timeoutID == \"number\") {
          window.clearTimeout(this.timeoutID);
          delete this.timeoutID;
        }
      }
    };
    alarm.setup(#{timeout});
    window.onblur = function() { alarm.setup(#{timeout}) ; alarm.wake(); };
    window.onfocus = function() { alarm.setup(#{timeout}) ; alarm.wake(); };
    window.onmousemove = function() { alarm.setup(#{timeout}) ; alarm.wake(); };
    ")
  end

end