/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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 nsIURI;
interface nsIPrincipal;
interface mozIPlacesPendingOperation;
interface nsIFaviconDataCallback;

[scriptable, uuid(e81e0b0c-b9f1-4c2e-8f3c-b809933cf73c)]
interface nsIFaviconService : nsISupports
{
  // The favicon is being loaded from a private browsing window
  const unsigned long FAVICON_LOAD_PRIVATE = 1;
  // The favicon is being loaded from a non-private browsing window
  const unsigned long FAVICON_LOAD_NON_PRIVATE = 2;

  // Defines values for icon flags.
  const unsigned short ICONDATA_FLAGS_RICH = 1 << 0;

  /**
   * The limit in bytes of the size of favicons in memory and passed via the
   * favicon protocol.
   */
  const unsigned long MAX_FAVICON_BUFFER_SIZE = 65536;

  /**
   * For a given icon URI, this will return a URI that will result in the image.
   * In most cases, this is an annotation URI.  For chrome URIs, this will do
   * nothing but returning the input URI.
   *
   * No validity checking is done. If you pass an icon URI that we've never
   * seen, you'll get back a URI that references an invalid icon. The
   * cached-favicon protocol handler's special case for cached favicon will
   * resolve invalid icons to the default icon, although without caching.
   * For invalid chrome URIs, you'll get a broken image.
   *
   * @param aFaviconURI
   *        The URI of an icon in the favicon service.
   * @return A URI that will give you the icon image.  This is NOT the URI of
   *         the icon as set on the page, but a URI that will give you the
   *         data out of the favicon service.  For a normal page with a
   *         favicon we've stored, this will be an annotation URI which will
   *         then cause the corresponding favicon data to be loaded async from
   *         this service.  For pages where we don't have a favicon, this will
   *         be a chrome URI of the default icon. For chrome URIs, the
   *         output will be the same as the input.
   */
  nsIURI getFaviconLinkForIcon(in nsIURI aFaviconURI);

  /**
   * Expire all known favicons from the database.
   *
   * @note This is an async method.
   *       On successful completion a "places-favicons-expired" notification is
   *       dispatched through observer's service.
   */
  void expireAllFavicons();

  /**
   * Sets the default size returned by preferredSizeFromURI when the uri doesn't
   * specify a size ref. If this is not invoked first, or 0 is passed to it,
   * preferredSizeFromURI() will return UINT16_MAX, that matches the biggest
   * icon available.
   */
  void setDefaultIconURIPreferredSize(in unsigned short aDefaultSize);

  /**
   * Tries to extract the preferred size from an icon uri ref fragment.
   *
   * @param aURI
   *        The URI to parse.
   * @return The preferred size, or a default size set through
   *         setDefaultIconURIPreferredSize, or UINT16_MAX if neither are set.
   */
  unsigned short preferredSizeFromURI(in nsIURI aURI);

  /**
   * The default favicon URI
   */
  readonly attribute nsIURI defaultFavicon;

  /**
   * The default favicon mimeType
   */
  readonly attribute AUTF8String defaultFaviconMimeType;

  /**
   * Stores the relation between a page URI and a favicon URI, whose icon data
   * is provided through a data URL.
   * The process is asynchronous and a callback with the status of the operation
   * will be invoked at the end of it.
   *
   * @param aPageURI
   *        URI of the page whose favicon is being set.
   * @param aFaviconURI
   *        URI of the favicon to associate with the page.
   * @param aDataURL
   *        String that represents a data URL to replace as the favicon content.
   * @param [optional] aExpiration
   *        Time in microseconds since the epoch when this favicon expires.
   *        Until this time, we won't try to load it again.
   *        If this argument is omitted, the expiration defaults to
   *        7 days (FaviconHelpers::MAX_FAVICON_EXPIRATION) from now.
   *
   * @return Promise that is resolved/rejected when finishing the process.
   *
   * @throws NS_ERROR_FILE_TOO_BIG if the icon is excessively large and can not
   *         be optimized internally.
   */
  [implicit_jscontext, must_use]
  Promise setFaviconForPage(
    in nsIURI aPageURI,
    in nsIURI aFaviconURI,
    in nsIURI aDataURL,
    [optional] in PRTime aExpiration,
    [optional] in boolean isRichIcon
  );

  /**
   * Retrieves the favicon URI associated to the given page, if any.
   *
   * @param aPageURI
   *        URI of the page whose favicon URI we're looking up.
   * @param aCallback
   *        This callback is always invoked to notify the result of the lookup.
   *        The aURI parameter will be the favicon URI, or null when no favicon
   *        is associated with the page or an error occurred while fetching it.
   *        aDataLen will be always 0, aData will be an empty array, and
   *        aMimeType will be an empty string, regardless of whether a favicon
   *        was found.
   * @param [optional] aPreferredWidth
   *        The preferred icon width, skip or pass 0 for the default value,
   *        set through setDefaultIconURIPreferredSize.
   *
   * @note If a favicon specific to this page cannot be found, this will try to
   *       fallback to the /favicon.ico for the root domain.
   *
   * @see nsIFaviconDataCallback in nsIFaviconService.idl.
   */
  void getFaviconURLForPage(in nsIURI aPageURI,
                            in nsIFaviconDataCallback aCallback,
                            [optional] in unsigned short aPreferredWidth);

  /**
   * Retrieves the favicon URI and data associated to the given page, if any.
   * If the page icon is not available, it will try to return the root domain
   * icon data, when it's known.
   *
   * @param aPageURI
   *        URI of the page whose favicon URI and data we're looking up.
   * @param aCallback
   *        This callback is always invoked to notify the result of the lookup.  The aURI
   *        parameter will be the favicon URI, or null when no favicon is
   *        associated with the page or an error occurred while fetching it.  If
   *        aURI is not null, the other parameters may contain the favicon data.
   *        However, if no favicon data is currently associated with the favicon
   *        URI, aDataLen will be 0, aData will be an empty array, and aMimeType
   *        will be an empty string.
   * @param [optional] aPreferredWidth
   *        The preferred icon width, skip or pass 0 for the default value,
   *        set through setDefaultIconURIPreferredSize.
   * @note If a favicon specific to this page cannot be found, this will try to
   *       fallback to the /favicon.ico for the root domain.
   *
   * @see nsIFaviconDataCallback in nsIFaviconService.idl.
   */
  void getFaviconDataForPage(in nsIURI aPageURI,
                             in nsIFaviconDataCallback aCallback,
                             [optional] in unsigned short aPreferredWidth);

  /**
   * Copies cached favicons from a page to another one.
   *
   * @param aFromPageURI
   *        URI of the originating page.
   * @param aToPageURI
   *        URI of the destination page.
   * @param aFaviconLoadType
   *        Set to FAVICON_LOAD_PRIVATE if the copy is started from a private
   *        browsing window.  Set to FAVICON_LOAD_NON_PRIVATE otherwise.
   * @param [optional] aCallback
   *        Once we're done copying the favicon, we invoke this callback.
   *        If a copy has been done, the callback will report one of the
   *        favicons uri as aFaviconURI, otherwise all the params will be null.
   */
  void copyFavicons(in nsIURI aFromPageURI,
                    in nsIURI aToPageURI,
                    in unsigned long aFaviconLoadType,
                    [optional] in nsIFaviconDataCallback aCallback);
};

[scriptable, function, uuid(c85e5c82-b70f-4621-9528-beb2aa47fb44)]
interface nsIFaviconDataCallback : nsISupports
{
  /**
   * Called when the required favicon's information is available.
   *
   * It's up to the invoking method to state if the callback is always invoked,
   * or called on success only.  Check the method documentation to ensure that.
   *
   * The caller will receive the most information we can gather on the icon,
   * but it's not guaranteed that all of them will be set.  For some method
   * we could not know the favicon's data (it could just be too expensive to
   * get it, or the method does not require we actually have any data).
   * It's up to the caller to check aDataLen > 0 before using any data-related
   * information like mime-type or data itself.
   *
   * @param aFaviconURI
   *        Receives the "favicon URI" (not the "favicon link URI") associated
   *        to the requested page.  This can be null if there is no associated
   *        favicon URI, or the callback is notifying a failure.
   * @param aDataLen
   *        Size of the icon data in bytes.  Notice that a value of 0 does not
   *        necessarily mean that we don't have an icon.
   * @param aData
   *        Icon data, or an empty array if aDataLen is 0.
   * @param aMimeType
   *        Mime type of the icon, or an empty string if aDataLen is 0.
   * @param aWidth
   *        Width of the icon. 0 if the width is unknown or if the icon is
   *        vectorial.
   *
   * @note If you want to open a network channel to access the favicon, it's
   *       recommended that you call the getFaviconLinkForIcon method to convert
   *       the "favicon URI" into a "favicon link URI".
   */
  void onComplete(in nsIURI aFaviconURI,
                  in unsigned long aDataLen,
                  [const,array,size_is(aDataLen)] in octet aData,
                  in AUTF8String aMimeType,
                  in unsigned short aWidth);
};

%{C++

/**
 * Notification sent when all favicons are expired.
 */
#define NS_PLACES_FAVICONS_EXPIRED_TOPIC_ID "places-favicons-expired"

#define FAVICON_DEFAULT_URL "chrome://global/skin/icons/defaultFavicon.svg"
#define FAVICON_DEFAULT_MIMETYPE "image/svg+xml"

#define FAVICON_ERRORPAGE_URL "chrome://global/skin/icons/info.svg"
#define FAVICON_CERTERRORPAGE_URL "chrome://global/skin/icons/warning.svg"

%}