/* -*- Mode: Javascript; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is the feed tab for Page Info.
 *
 * The Initial Developer of the Original Code is
 *   Florian QUEZE <f.qu@queze.net>
 * Portions created by the Initial Developer are Copyright (C) 2006-2007
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Ehsan Akhgari <ehsan.akhgari@gmail.com>
 *   Daniel Brooks <db48x@yahoo.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

function initFeedTab()
{
  const feedTypes = {
    "application/rss+xml": gBundle.getString("feedRss"),
    "application/atom+xml": gBundle.getString("feedAtom"),
    "text/xml": gBundle.getString("feedXML"),
    "application/xml": gBundle.getString("feedXML"),
    "application/rdf+xml": gBundle.getString("feedXML")
  };

  // get the feeds
  var linkNodes = gDocument.getElementsByTagName("link");
  var length = linkNodes.length;
  for (var i = 0; i < length; i++) {
    var link = linkNodes[i];
    if (!link.href)
      continue;

    var rel = link.rel && link.rel.toLowerCase();
    var isFeed = /(?:^|\s)feed(?:\s|$)/i.test(rel);
    if (!isFeed && /(?:^|\s)alternate(?:\s|$)/i.test(rel) &&
        !/(?:^|\s)stylesheet(?:\s|$)/i.test(rel)) {
      var feed = { title: link.title, href: link.href, type: link.type };
      if (isValidFeed(feed, gDocument.nodePrincipal, isFeed)) {
        var type = feed.type;
        if (type in feedTypes)
          type = feedTypes[type];
        else
          type = feedTypes["application/rss+xml"];
        addRow(feed.title, type, feed.href);
      }
    }
  }
  var feedListbox = document.getElementById("feedListbox");
  document.getElementById("feedTab").hidden = feedListbox.getRowCount() == 0;
}

function onSubscribeFeed()
{
  var listbox = document.getElementById("feedListbox");
  openTopWin(listbox.selectedItem.getAttribute("feedURL"));
}

function addRow(name, type, url)
{
  var item = document.createElement("richlistitem");
  item.setAttribute("feed", "true");
  item.setAttribute("name", name);
  item.setAttribute("type", type);
  item.setAttribute("feedURL", url);
  document.getElementById("feedListbox").appendChild(item);
}