var EventSystem = (function() {

  var self = this;

  self.queue = {};

  var EventSystem = {

    trigger: function (event, data) {
      var queue = self.queue[event];

      if (typeof queue === 'undefined') {
        return false;
      }

      for (var i = 0; i < queue.length; i++) {
        queue[i](data);
      }

      return true;
    },

    subscribe: function (event, callback) {
      if (typeof self.queue[event] === 'undefined') {
        self.queue[event] = [];
      }

      self.queue[event].push(callback);
    }
  };

  return EventSystem;

}());

module.exports = EventSystem;