Awesomescreen

const PANEL_ID = 'panel.mozillafeed@soeren-hentzschel.at';
const DATASET_ID = 'dataset.mozillafeed@soeren-hentzschel.at';
const REF_ID = 'campaign=fx-android-home&version=1.0';
const FEED_URL = 'http://www.soeren-hentzschel.at/category/mozilla/feed/';
const IMAGE_URL = 'http://www.soeren-hentzschel.at/api/v1/icons/64/';


const { classes: Cc, interfaces: Ci, utils: Cu } = Components;


Cu.import('resource://gre/modules/Home.jsm');
Cu.import('resource://gre/modules/HomeProvider.jsm');
Cu.import('resource://gre/modules/Messaging.jsm');
Cu.import('resource://gre/modules/Services.jsm');
Cu.import('resource://gre/modules/Task.jsm');
Cu.import('resource://gre/modules/XPCOMUtils.jsm');


XPCOMUtils.defineLazyGetter(this, 'Strings', function() {
  return Services.strings.createBundle('chrome://mozillafeed/locale/i18n.properties');
});


function optionsCallback() {
  return {
    title: Strings.GetStringFromName('title'),
    views: [{
      type: Home.panels.View.LIST,
      dataset: DATASET_ID,
      onrefresh : refreshDataset,
      empty : {
        text : Strings.GetStringFromName('empty_text')
      }
    }]
  };
}


function parseFeed(url, onFinish) {
  let listener = {
    handleResult : function handleResult (feedResult) {
      let feedDoc = feedResult.doc;
      let parsedFeed = feedDoc.QueryInterface(Ci.nsIFeed);


      onFinish(parsedFeed);
    }
  };


  let xhr = Cc['@mozilla.org/xmlextras/xmlhttprequest;1'].createInstance(Ci.nsIXMLHttpRequest);


  xhr.open('GET', url, true);
  xhr.overrideMimeType('text/xml');


  xhr.onload = function onload () {
    let uri = Services.io.newURI(url, null, null);
    let processor = Cc['@mozilla.org/feed-processor;1'].createInstance(Ci.nsIFeedProcessor);


    processor.listener = listener;
    processor.parseFromString(xhr.responseText, uri);
  };


  xhr.send(null);
}


function feedToItems(feed) {
  let items = [];


  for (let i = 0; i < feed.items.length; i++) {
    let entry = feed.items.queryElementAt(i, Ci.nsIFeedEntry);


    entry.QueryInterface(Ci.nsIFeedContainer);
    entry.link.QueryInterface(Ci.nsIURI);


    let pubdate = new Date(entry.published);
    let date = pubdate.getDate() + '.' + (pubdate.getMonth() + 1) + '.' + pubdate.getFullYear();
    let time = pubdate.getHours() + ':' + pubdate.getMinutes() + ' ' + Strings.GetStringFromName('clock');


    let item = {
      url : entry.link.spec + '?' + REF_ID,
      title : entry.title.plainText(),
      description : Strings.GetStringFromName('published') + ': ' + date + ', ' + time,
      image_url : 'http://agenedia.com/soeren-hentzschel.at/api/v1/images/firefox3.png'
    };


    items.push(item);
  }


  return items;
}


function refreshDataset() {
  parseFeed(FEED_URL, function (parsedFeed) {
    Task.spawn(function () {
      let items = feedToItems(parsedFeed);
      let storage = HomeProvider.getStorage(DATASET_ID);


      yield storage.deleteAll();
      yield storage.save(items);
    });
  });
}


function deleteDataset() {
  Task.spawn(function() {
    let storage = HomeProvider.getStorage(DATASET_ID);
    yield storage.deleteAll();
  });
}


function startup(data, reason) {
  Home.panels.register(PANEL_ID, optionsCallback);


  switch(reason) {
    case ADDON_INSTALL:
      Home.panels.install(PANEL_ID);
      HomeProvider.requestSync(DATASET_ID, refreshDataset);
      break;
    case ADDON_UPGRADE:
    case ADDON_DOWNGRADE:
      Home.panels.update(PANEL_ID);
      break;
  }


  HomeProvider.addPeriodicSync(DATASET_ID, 3600, refreshDataset);
}


function shutdown(data, reason) {
  if (reason == ADDON_UNINSTALL || reason == ADDON_DISABLE) {
    Home.panels.uninstall(PANEL_ID);
    deleteDataset();
  }


  Home.panels.unregister(PANEL_ID);
}


function install(data, reason) {}


function uninstall(data, reason) {}