/* Copyright 2008 the Melange authors.

 *

 * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0

 * 

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

function BlogPreview(container) {

  this.container_ = container;

}

BlogPreview.prototype.show = function (url, entries_num, title, title_link) {

  var feed = new google.feeds.Feed(url);

  var preview = this;

  feed.setNumEntries(entries_num);

  feed.load(function (result) {

    preview.render_(result, title, title_link);

  });

};

BlogPreview.prototype.render_ = function (result, title, title_link) {

  if (!result.feed || !result.feed.entries) {

    return;

  }

  while (this.container_.firstChild) {

    this.container_.removeChild(this.container_.firstChild);

  }

  var blog = this.createDiv_(this.container_, "blog");

  var header = this.createElement_("h2", blog, "");

  if (!title) {

    title = result.feed.title;

  }

  if (!title_link) {

    title_link = result.feed.link;

  }

  this.createLink_(header, title_link, title);

  for (var i = 0; i < result.feed.entries.length; i++) {

    var entry = result.feed.entries[i];

    var div = this.createDiv_(blog, "entry");

    var linkDiv = this.createDiv_(div, "title");

    this.createLink_(linkDiv, entry.link, entry.title);

    if (entry.author) {

      this.createDiv_(div, "author", "Posted by " + entry.author);

    }

    this.createDiv_(div, "snippet", entry.contentSnippet);

  }

};

BlogPreview.prototype.createDiv_ = function (parent, className, opt_text) {

  return this.createElement_("div", parent, className, opt_text);

};

BlogPreview.prototype.createLink_ = function (parent, href, text) {

  var link = this.createElement_("a", parent, "", text);

  link.href = href;

  return link;

};

BlogPreview.prototype.createElement_ = function (tagName, parent, className,

                                                 opt_text) {

  var div = document.createElement(tagName);

  div.className = className;

  parent.appendChild(div);

  if (opt_text) {

    div.appendChild(document.createTextNode(opt_text));

  }

  return div;

};