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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsIStreamListener.idl"

interface nsIMsgStatusFeedback;
interface nsIMsgIdentity;
interface nsIMsgSendLaterListener;
interface nsIMsgFolder;

/**
 * nsIMsgSendLater is a service used for sending messages in the background.
 * Messages should be saved to an identity's unsent messages folder, and then
 * can be sent by calling sendUnsentMessages.
 *
 * Although the service supports passing identities as parameters, until bug
 * 317803 is fixed, all identities use the same folder, and hence the option
 * currently doesn't work.
 */
[scriptable, uuid(fa324a4b-4b87-4e9a-a3c0-af9071a358df)]
interface nsIMsgSendLater : nsIStreamListener 
{
  /// Used to obtain status feedback for when messages are sent.
  attribute nsIMsgStatusFeedback statusFeedback;

  /**
   * Sends any unsent messages in the identity's unsent messages folder.
   *
   * @param aIdentity   The identity to send messages for.
   */
  void sendUnsentMessages(in nsIMsgIdentity aIdentity);

  /**
   * Adds an listener to the service to receive notifications.
   *
   * @param aListener   The listener to add.
   */
  void addListener(in nsIMsgSendLaterListener aListener);

  /**
   * Removes a listener from the service.
   *
   * @param aListener                 The listener to remove.
   * @exception NS_ERROR_INVALID_ARG  If the listener was not already added to
   *                                  the service.
   */
  void removeListener(in nsIMsgSendLaterListener aListener);

  /**
   * Returns the unsent messages folder for the identity.
   */
  nsIMsgFolder getUnsentMessagesFolder(in nsIMsgIdentity userIdentity);

  /**
   * Returns true if there are any unsent messages to send.
   *
   * @param aIdentity  The identity whose folder to check for unsent messages.
   *                   If not specified, all unsent message folders are checked.
   */
  boolean hasUnsentMessages([optional] in nsIMsgIdentity aIdentity);

  /// Returns true if the service is currently sending messages.
  readonly attribute boolean sendingMessages;
};