/* 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"

%{C++
#include "Entries.h"
#include "LookupCache.h"
class nsUrlClassifierLookupResult;
%}
[ptr] native ResultArray(nsTArray<mozilla::safebrowsing::LookupResult>);
[ptr] native CacheCompletionArray(nsTArray<mozilla::safebrowsing::CacheResult>);
[ptr] native PrefixArray(mozilla::safebrowsing::PrefixArray);

interface nsIUrlClassifierHashCompleter;
interface nsIPrincipal;

// Interface for JS function callbacks
[scriptable, function, uuid(4ca27b6b-a674-4b3d-ab30-d21e2da2dffb)]
interface nsIUrlClassifierCallback : nsISupports {
  void handleEvent(in ACString value);
};

/**
 * The nsIUrlClassifierUpdateObserver interface is implemented by
 * clients streaming updates to the url-classifier (usually
 * nsUrlClassifierStreamUpdater.
 */
[scriptable, uuid(9fa11561-5816-4e1b-bcc9-b629ca05cce6)]
interface nsIUrlClassifierUpdateObserver : nsISupports {
  /**
   * The update requested a new URL whose contents should be downloaded
   * and sent to the classifier as a new stream.
   *
   * @param url The url that was requested.
   * @param table The table name that this URL's contents will be associated
   *              with.  This should be passed back to beginStream().
   */
  void updateUrlRequested(in ACString url,
                          in ACString table);

  /**
   * A stream update has completed.
   *
   * @param status The state of the update process.
   * @param delay The amount of time the updater should wait to fetch the
   *              next URL in ms.
   */
  void streamFinished(in nsresult status, in unsigned long delay);

  /* The update has encountered an error and should be cancelled */
  void updateError(in nsresult error);

  /**
   * The update has completed successfully.
   *
   * @param requestedTimeout The number of seconds that the caller should
   *                         wait before trying to update again.
   **/
  void updateSuccess(in unsigned long requestedTimeout);
};

/**
 * This is a proxy class that is instantiated and called from the JS thread.
 * It provides async methods for querying and updating the database.  As the
 * methods complete, they call the callback function.
 */
[scriptable, uuid(7a258022-6765-11e5-b379-b37b1f2354be)]
interface nsIUrlClassifierDBService : nsISupports
{
  /**
   * Looks up a URI in the specified tables.
   *
   * @param principal: The principal containing the URI to search.
   * @param c: The callback will be called with a comma-separated list
   *        of tables to which the key belongs.
   */
  void lookup(in nsIPrincipal principal,
              in ACString tables,
              in nsIUrlClassifierCallback c);

  /**
   * Lists the tables along with which chunks are available in each table.
   * This list is in the format of the request body:
   *   tablename;chunkdata\n
   *   tablename2;chunkdata2\n
   *
   * For example:
   *   goog-phish-regexp;a:10,14,30-40s:56,67
   *   goog-white-regexp;a:1-3,5
   */
  void getTables(in nsIUrlClassifierCallback c);

  /**
   * Set the nsIUrlClassifierCompleter object for a given table.  This
   * object will be used to request complete versions of partial
   * hashes.
   */
  void setHashCompleter(in ACString tableName,
                        in nsIUrlClassifierHashCompleter completer);

  /**
   * Set the last update time for the given table. We use this to
   * remember freshness past restarts. Time is in milliseconds since epoch.
   */
  void setLastUpdateTime(in ACString tableName,
                         in unsigned long long lastUpdateTime);

  /**
   * Forget the results that were used in the last DB update.
   */
  void clearLastResults();

  ////////////////////////////////////////////////////////////////////////////
  // Incremental update methods.
  //
  // An update to the database has the following steps:
  //
  // 1) The update process is started with beginUpdate().  The client
  //    passes an nsIUrlClassifierUpdateObserver object which will be
  //    notified as the update is processed by the dbservice.
  // 2) The client sends an initial update stream to the dbservice,
  //    using beginStream/updateStream/finishStream.
  // 3) While reading this initial update stream, the dbservice may
  //    request additional streams from the client as requested by the
  //    update stream.
  // 4) For each additional update stream, the client feeds the
  //    contents to the dbservice using beginStream/updateStream/endStream.
  // 5) Once all streams have been processed, the client calls
  //    finishUpdate.  When the dbservice has finished processing
  //    all streams, it will notify the observer that the update process
  //    is complete.

  /**
   * Begin an update process.  Will throw NS_ERROR_NOT_AVAILABLE if there
   * is already an update in progress.
   *
   * @param updater The update observer tied to this update.
   * @param tables A comma-separated list of tables included in this update.
   */
  void beginUpdate(in nsIUrlClassifierUpdateObserver updater,
                   in ACString tables);

  /**
   * Begin a stream update.  This should be called once per url being
   * fetched.
   *
   * @param table The table the contents of this stream will be associated
   *              with, or empty for the initial stream.
   */
  void beginStream(in ACString table);

  /**
   * Update the table incrementally.
   */
  void updateStream(in ACString updateChunk);

  // It would be nice to have an updateFromStream method to round out the
  // interface, but it's tricky because of XPCOM proxies.

  /**
   * Finish an individual stream update.  Must be called for every
   * beginStream() call, before the next beginStream() or finishUpdate().
   *
   * The update observer's streamFinished will be called once the
   * stream has been processed.
   */
  void finishStream();

  /**
   * Finish an incremental update.  This will attempt to commit any
   * pending changes and resets the update interface.
   *
   * The update observer's updateSucceeded or updateError methods
   * will be called when the update has been processed.
   */
  void finishUpdate();

  /**
   * Cancel an incremental update.  This rolls back any pending changes.
   * and resets the update interface.
   *
   * The update observer's updateError method will be called when the
   * update has been rolled back.
   */
  void cancelUpdate();

  /**
   * Reset the url-classifier database.  This call will delete the existing
   * database, emptying all tables.  Mostly intended for use in unit tests.
   */
  void resetDatabase();

  /**
   * Reload he url-classifier database. This will empty all cache for
   * completions from gethash, and reload it from database. Mostly intended
   * for use in tests.
   */
  void reloadDatabase();
};

/**
 * This is an internal helper interface for communication between the
 * main thread and the dbservice worker thread.  It is called for each
 * lookup to provide a set of possible results, which the main thread
 * may need to expand using an nsIUrlClassifierCompleter.
 */
[uuid(b903dc8f-dff1-42fe-894b-36e7a59bb801)]
interface nsIUrlClassifierLookupCallback : nsISupports
{
  /**
   * The lookup process is complete.
   *
   * @param results
   *        If this parameter is null, there were no results found.
   *        If not, it contains an array of nsUrlClassifierEntry objects
   *        with possible matches.  The callee is responsible for freeing
   *        this array.
   */
  void lookupComplete(in ResultArray results);
};
