/* ***** 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 Bookmarks Sync.
 *
 * The Initial Developer of the Original Code is Mozilla.
 * Portions created by the Initial Developer are Copyright (C) 2007
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *  Anant Narayanan <anant@kix.in>
 *
 * 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 ***** */

const EXPORTED_SYMBOLS = ['Tracker'];

const Cc = Components.classes;
const Ci = Components.interfaces;
const Cr = Components.results;
const Cu = Components.utils;

Cu.import("resource://gre/modules/XPCOMUtils.jsm");
Cu.import("resource://weave/log4moz.js");
Cu.import("resource://weave/constants.js");
Cu.import("resource://weave/util.js");
Cu.import("resource://weave/async.js");

Function.prototype.async = Async.sugar;

/*
 * Trackers are associated with a single engine and deal with
 * listening for changes to their particular data type
 * and updating their 'score', indicating how urgently they
 * want to sync.
 *
 * 'score's range from 0 (Nothing's changed)
 * to 100 (I need to sync now!)
 * -1 is also a valid score
 * (don't sync me unless the user specifically requests it)
 *
 * Setting a score outside of this range will raise an exception.
 * Well not yet, but it will :)
 */
function Tracker() {
  this._init();
}
Tracker.prototype = {
  _logName: "Tracker",
  _score: 0,

  _init: function T__init() {
    this._log = Log4Moz.Service.getLogger("Service." + this._logName);
    this._score = 0;
  },

  /* Should be called by service periodically
   * before deciding which engines to sync
   */
  get score() {
    if (this._score >= 100)
      return 100;
    else
      return this._score;
  },

  /* Should be called by service everytime a sync
   * has been done for an engine
   */
  resetScore: function T_resetScore() {
    this._score = 0;
  }
};