/**
 * Returns the given html wrapped in a div element
 *
 * Fixing IE's inability to treat unknown elements (HTML5 section, article, ...) correctly
 * when inserted via innerHTML
 *
 * @param {String} html The html which should be wrapped in a dom element
 * @param {Obejct} [context] Document object of the context the html belongs to
 *
 * @example
 *    wysihtml.dom.getAsDom("<article>foo</article>");
 */
wysihtml.dom.getAsDom = (function() {

  var _innerHTMLShiv = function(html, context) {
    var tempElement = context.createElement("div");
    tempElement.style.display = "none";
    context.body.appendChild(tempElement);
    // IE throws an exception when trying to insert <frameset></frameset> via innerHTML
    try { tempElement.innerHTML = html; } catch(e) {}
    context.body.removeChild(tempElement);
    return tempElement;
  };

  /**
   * Make sure IE supports HTML5 tags, which is accomplished by simply creating one instance of each element
   */
  var _ensureHTML5Compatibility = function(context) {
    if (context._wysihtml_supportsHTML5Tags) {
      return;
    }
    for (var i=0, length=HTML5_ELEMENTS.length; i<length; i++) {
      context.createElement(HTML5_ELEMENTS[i]);
    }
    context._wysihtml_supportsHTML5Tags = true;
  };


  /**
   * List of html5 tags
   * taken from http://simon.html5.org/html5-elements
   */
  var HTML5_ELEMENTS = [
    "abbr", "article", "aside", "audio", "bdi", "canvas", "command", "datalist", "details", "figcaption",
    "figure", "footer", "header", "hgroup", "keygen", "mark", "meter", "nav", "output", "progress",
    "rp", "rt", "ruby", "svg", "section", "source", "summary", "time", "track", "video", "wbr"
  ];

  return function(html, context) {
    context = context || document;
    var tempElement;
    if (typeof(html) === "object" && html.nodeType) {
      tempElement = context.createElement("div");
      tempElement.appendChild(html);
    } else if (wysihtml.browser.supportsHTML5Tags(context)) {
      tempElement = context.createElement("div");
      tempElement.innerHTML = html;
    } else {
      _ensureHTML5Compatibility(context);
      tempElement = _innerHTMLShiv(html, context);
    }
    return tempElement;
  };
})();
