/* ***** 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 gContactSync.
 *
 * The Initial Developer of the Original Code is
 * Josh Geenen <gcontactsync@pirules.org>.
 * Portions created by the Initial Developer are Copyright (C) 2008-2009
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * 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 ***** */

if (!com) var com = {}; // A generic wrapper variable
// A wrapper for all GCS functions and variables
if (!com.gContactSync) com.gContactSync = {};

/**
 * AbListener is a listener for the Address Book that is currently only used to
 * update the last modified date of mailing lists and cards contained within
 * them.
 * @class
 */
com.gContactSync.AbListener = {
  /**
   * Unused.
   * @param aParentDir The parent directory to which an item was added.
   * @param aItem      The item added to the directory.
   */
  onItemAdded: function AbListener_onItemAdded(aParentDir, aItem) {},
  /**
   * Unused.
   * @param aItem     The item whose property was changed.
   * @param aProperty The property changed.
   * @param aOldValue The former value of the property.
   * @param aNewValue The new value of the property.
   */
  onItemPropertyChanged: function AbListener_onItemPropertyChanged(aItem,
                                                                   aProperty,
                                                                   aOldValue,
                                                                   aNewValue) {},
  /**
   * Used just to update the lastModifiedDate of cards removed from a mail list.
   * If a mail list is removed nothing needs to be done since the Group will be
   * deleted in Gmail.
   * @param aParentDir {nsIAbDirectory} The directory from which an item was
   *                                    removed.  Ignored unless it is a list.
   * @param aItem      The item removed from a directory.  Ignored unless it is
   *                   an Address Book card removed from a mail list.
   */
  onItemRemoved: function AbListener_onItemRemoved(aParentDir, aItem) {
    aParentDir.QueryInterface(Components.interfaces.nsIAbDirectory);

    // if a contact was removed and there is not an ongoing synchronization
    if (aItem instanceof Components.interfaces.nsIAbCard &&
        !com.gContactSync.Preferences.mSyncPrefs.synchronizing.value) {
      // if a contact was removed from just a mailing list, update the contact's
      // last modified date in the parent address book
      if (aParentDir.isMailList) {
        try {
          aItem.QueryInterface(Components.interfaces.nsIAbCard);
          var now = (new Date()).getTime() / 1000;
          // the URI of the list's parent
          var uri = this.getURI(aParentDir);
          uri = uri.substring(0, uri.lastIndexOf("/"));
          // the parent of aParentDir (aParentDir is a mailing list, dir is the
          // directory in which aParentDir is stored)
          var dir = new com.gContactSync.GAddressBook(com.gContactSync.AbManager.getAbByURI(uri));
          var contact = new com.gContactSync.TBContact(aItem, dir);
          // set the last modified date and update the card
          contact.setValue("LastModifiedDate", now);
          contact.update();
        }
        catch (e) {
          com.gContactSync.LOGGER.LOG_WARNING("Error updating card after being removed: " + 
                             aItem + " " + uri + " " + now, e);
        }
      }
    }
  },
  /**
   * Gets the Uniform Resource Identifier (URI) of the specified directory.
   * @param aDirectory {nsIAbDirectory} The directory whose URI is returned.
   * @returns {string} The URI of aDirectory.
   */
  getURI: function AbListener_getURI(aDirectory) {
    var error;
    try {
      if (aDirectory && (aDirectory instanceof Components.interfaces.nsIAbDirectory)) {
        if (aDirectory.URI) // Thunderbird 3
          return aDirectory.URI;
        aDirectory.QueryInterface(Components.interfaces.nsIAbMDBDirectory); // Thunderbird 2
        if (aDirectory.getDirUri)
          return aDirectory.getDirUri();
     } 
    } catch (e) { error = e; }
    com.gContactSync.LOGGER.LOG_WARNING("AbListener could not get a URI for: " + aDirectory,
                       error);
    return "";
  },
  /**
   * Adds this listener to be alerted whenever a directory item is removed.
   * It will be called whenever an item (card or mail list) is removed from a
   * directory (address book or mail list).
   */
  add: function AbListener_add() {
    var flags;
    if (Components.classes["@mozilla.org/abmanager;1"]) { // Thunderbird 3
      flags = Components.interfaces.nsIAbListener.directoryItemRemoved;
      Components.classes["@mozilla.org/abmanager;1"]
                .getService(Components.interfaces.nsIAbManager)
                .addAddressBookListener(com.gContactSync.AbListener, flags);
    }
    else { // Thunderbird 2
      flags = Components.interfaces.nsIAddrBookSession.directoryItemRemoved;
      Components.classes["@mozilla.org/addressbook/services/session;1"]
                .getService(Components.interfaces.nsIAddrBookSession)
                .addAddressBookListener(com.gContactSync.AbListener, flags);
    }
  },
  /**
   * Removes this listener.
   */
  remove: function AbListener_remove() {
    if (Components.classes["@mozilla.org/abmanager;1"]) // Thunderbird 3
      Components.classes["@mozilla.org/abmanager;1"]
                .getService(Components.interfaces.nsIAbManager)
                .removeAddressBookListener(com.gContactSync.AbListener);
    else // Thunderbird 2
      Components.classes["@mozilla.org/addressbook/services/session;1"]
                .getService(Components.interfaces.nsIAddrBookSession)
                .removeAddressBookListener(com.gContactSync.AbListener);
  }
};
