define(["backbone"], function(Backbone) {
  /**
   * Simple model for an asset.
   */
  var Asset = Backbone.Model.extend({
    defaults: {
      display_name: "",
      content_type: "",
      thumbnail: "",
      date_added: "",
      url: "",
      external_url: "",
      portable_url: "",
      locked: false
    },
    get_extension: function(){
      var name_segments = this.get("display_name").split(".").reverse();
      var asset_type = (name_segments.length > 1) ? name_segments[0].toUpperCase() : "";
      return asset_type;
    }
  });
  return Asset;
});