// isBehind.js
(function () {
  /*global adventurejs A*/
  var p = adventurejs.Tangible.prototype;

  /**
   * <strong>isBehind</strong> tests whether
   * one asset is specifically in the <code>behind</code> aspect of another asset.
   * This is a one-to-one check that doesn't take nesting into consideration.
   * <pre class="display"><code class="language-javascript">if( MyGame.$('killer').$isBehind('curtain') ){ // do stuff }
   * </code></pre>
   * @memberOf adventurejs.Tangible
   * @method adventurejs.Tangible#isBehind
   * @param {Object|String} asset Can be string or object.
   * @returns {boolean}
   */
  p.isBehind = p.$isBehind = function Tangible_isBehind(asset) {
    if ("undefined" === typeof asset) {
      return this.getPlacePreposition() === "behind";
    }
    if ("string" === typeof asset) asset = this.game.getAsset(asset);
    if (!asset || !asset.id || !asset.hasClass("Tangible")) return false;
    if (this.getPlacePreposition() !== "behind") return false;
    if (this.getPlaceAsset().id !== asset.id) return false;
    return true;
  };
})();