/* -*- Mode: IDL; tab-width: 4; 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 "nsISupports.idl"

interface nsIChannel;
interface nsIPrincipal;
interface nsIURI;

[scriptable, uuid(a5e61a3c-51bd-45be-ac0c-e87b71860656)]
interface nsIRefreshURI : nsISupports {
    /**
      * Load a uri after waiting for aMillis milliseconds. If the docshell
      * is busy loading a page currently, the refresh request will be
      * queued and executed when the current load finishes. 
      *
      * @param aUri The uri to refresh.
      * @param aPrincipal The triggeringPrincipal for the refresh load
      *   May be null, in which case a principal will be built based on the
      *   referrer URI of the previous docshell load, or will use the system
      *   principal when there is no referrer.
      * @param aMillis The number of milliseconds to wait.
      * @param aRepeat Flag to indicate if the uri is to be 
      *                repeatedly refreshed every aMillis milliseconds.
      * @param aMetaRefresh Flag to indicate if this is a Meta refresh.
      */
    void refreshURI(in nsIURI aURI,
                    in long aMillis, in boolean aRepeat,
                    in boolean aMetaRefresh,
                    [optional] in nsIPrincipal aPrincipal);

    /**
      * Loads a URI immediately as if it were a refresh.
      *
      * @param aURI The URI to refresh.
      * @param aPrincipal The triggeringPrincipal for the refresh load
      *   May be null, in which case a principal will be built based on the
      *   referrer URI of the previous docshell load, or will use the system
      *   principal when there is no referrer.
      * @param aMillis The number of milliseconds by which this refresh would
      *                be delayed if it were not being forced.
      * @param aMetaRefresh Flag to indicate if this is a meta refresh.
      */
    void forceRefreshURI(in nsIURI aURI,
                         in long aMillis, in boolean aMetaRefresh,
                         [optional] in nsIPrincipal aPrincipal);

    /**
      * Checks the passed in channel to see if there is a refresh header, 
      * if there is, will setup a timer to refresh the uri found
      * in the header. If docshell is busy loading a page currently, the
      * request will be queued and executed when the current page 
      * finishes loading. 
      *
      * Returns the NS_REFRESHURI_HEADER_FOUND success code if a refresh
      * header was found and successfully setup.
      *
      * @param aChannel The channel to be parsed. 
      */
    void setupRefreshURI(in nsIChannel aChannel); 

    /**
      * Parses the passed in header string and sets up a refreshURI if
      * a "refresh" header is found. If docshell is busy loading a page 
      * currently, the request will be queued and executed when 
      * the current page finishes loading. 
      *
      * @param aBaseURI base URI to resolve refresh uri with.
      * @param aPrincipal The triggeringPrincipal for the refresh load
      *   May be null, in which case a principal will be built based on the
      *   referrer URI of the previous docshell load, or will use the system
      *   principal when there is no referrer.
      * @param aHeader  The meta refresh header string.
      */
    void setupRefreshURIFromHeader(in nsIURI aBaseURI,
                                   in nsIPrincipal principal,
                                   in ACString aHeader);

    /**
      * Cancels all timer loads.
      */
    void cancelRefreshURITimers();

   /**
     * True when there are pending refreshes, false otherwise.
     */
   readonly attribute boolean refreshPending;
};