/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* 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 nsIPrincipal;
interface nsIQuotaRequest;
interface nsIQuotaCallback;
interface nsIQuotaUsageCallback;
interface nsIQuotaUsageRequest;

[scriptable, builtinclass, uuid(1b3d0a38-8151-4cf9-89fa-4f92c2ef0e7e)]
interface nsIQuotaManagerService : nsISupports
{
  /**
   * Asynchronously retrieves storage name and returns it as a plain string.
   *
   * If the dom.quotaManager.testing preference is not true the call will be
   * a no-op.
   */
  [must_use] nsIQuotaRequest
  storageName();

  /**
   * Check if storage is initialized.
   *
   * If the dom.quotaManager.testing preference is not true the call will be
   * a no-op.
   */
  [must_use] nsIQuotaRequest
  storageInitialized();

  /**
   * Check if temporary storage is initialized.
   *
   * If the dom.quotaManager.testing preference is not true the call will be
   * a no-op.
   */
  [must_use] nsIQuotaRequest
  temporaryStorageInitialized();

  /**
   * Initializes storage directory. This can be used in tests to verify
   * upgrade methods.
   *
   * If the dom.quotaManager.testing preference is not true the call will be
   * a no-op.
   */
  [must_use] nsIQuotaRequest
  init();

  /**
   * Initializes temporary storage. This can be used in tests to verify
   * temporary storage initialization.
   *
   * If the dom.quotaManager.testing preference is not true the call will be
   * a no-op.
   */
  [must_use] nsIQuotaRequest
  initTemporaryStorage();

  /**
   * Initializes persistent origin directory for the given origin. This can be
   * used in tests to verify origin initialization.
   *
   * If the dom.quotaManager.testing preference is not true the call will be
   * a no-op.
   *
   * @param aPrincipal
   *        A principal for the origin whose directory is to be initialized.
   */
  [must_use] nsIQuotaRequest
  initializePersistentOrigin(in nsIPrincipal aPrincipal);

  /**
   * Initializes temporary origin directory for the given origin. This can be
   * used in tests to verify origin initialization.
   *
   * If the dom.quotaManager.testing preference is not true the call will be
   * a no-op.
   *
   * @param aPersistenceType
   *        A string that tells what persistence type of origin will be
   *        initialized (temporary or default).
   *
   * @param aPrincipal
   *        A principal for the origin whose directory is to be initialized.
   */
  [must_use] nsIQuotaRequest
  initializeTemporaryOrigin(in ACString aPersistenceType,
                            in nsIPrincipal aPrincipal);

  /**
   * Gets full origin metadata cached in memory for the given persistence type
   * and origin.
   *
   * NOTE: This operation may still be delayed by other operations on the QM
   *       I/O thread that are peforming I/O.
   *
   * @param aPersistenceType
   *        A string that tells what persistence type will be used for getting
   *        the metadata (either "temporary" or "default").
   * @param aPrincipal
   *        A principal that tells which origin will be used for getting the
   *        metadata.
   */
  [must_use] nsIQuotaRequest
  getFullOriginMetadata(in ACString aPersistenceType,
                        in nsIPrincipal aPrincipal);

  /**
   * Schedules an asynchronous callback that will inspect all origins and
   * return the total amount of disk space being used by storages for each
   * origin separately.
   *
   * @param aCallback
   *        The callback that will be called when the usage is available.
   * @param aGetAll
   *        An optional boolean to indicate inspection of all origins,
   *        including internal ones.
   */
  [must_use] nsIQuotaUsageRequest
  getUsage(in nsIQuotaUsageCallback aCallback,
           [optional] in boolean aGetAll);

  /**
   * Schedules an asynchronous callback that will return the total amount of
   * disk space being used by storages for the given origin.
   *
   * @param aPrincipal
   *        A principal for the origin whose usage is being queried.
   * @param aCallback
   *        The callback that will be called when the usage is available.
   * @param aFromMemory
   *        An optional flag to indicate whether the cached usage should be
   *        obtained. The default value is false.  Note that this operation may
   *        still be delayed by other operations on the QM I/O thread that are
   *        peforming I/O.
   * Note:  Origin usage here represents total usage of an origin. However,
   *        cached usage here represents only non-persistent usage of an origin.
   */
  [must_use] nsIQuotaUsageRequest
  getUsageForPrincipal(in nsIPrincipal aPrincipal,
                       in nsIQuotaUsageCallback aCallback,
                       [optional] in boolean aFromMemory);

  /**
   * Asynchronously lists all origins and returns them as plain strings.
   */
  [must_use] nsIQuotaRequest
  listOrigins();

  /**
   * Removes all storages. The files may not be deleted immediately depending
   * on prohibitive concurrent operations.
   * Be careful, this removes *all* the data that has ever been stored!
   *
   * If the dom.quotaManager.testing preference is not true the call will be
   * a no-op.
   */
  [must_use] nsIQuotaRequest
  clear();

  /**
   * Removes all storages stored for the given pattern. The files may not be
   * deleted immediately depending on prohibitive concurrent operations.  In
   * terms of locks, it will get an exclusive multi directory lock for given
   * pattern.  For example, given pattern {"userContextId":1007} and set of 3
   * origins ["http://www.mozilla.org^userContextId=1007",
   * "http://www.example.org^userContextId=1007",
   * "http://www.example.org^userContextId=1008"], the method will only lock 2
   * origins ["http://www.mozilla.org^userContextId=1007",
   * "http://www.example.org^userContextId=1007"].
   *
   * @param aPattern
   *        A pattern for the origins whose storages are to be cleared.
   *        Currently this is expected to be a JSON representation of the
   *        OriginAttributesPatternDictionary defined in ChromeUtils.webidl.
   */
  [must_use] nsIQuotaRequest
  clearStoragesForOriginAttributesPattern(in AString aPattern);

  /**
   * Removes all storages stored for the given principal. The files may not be
   * deleted immediately depending on prohibitive concurrent operations.
   *
   * @param aPrincipal
   *        A principal for the origin whose storages are to be cleared.
   * @param aPersistenceType
   *        An optional string that tells what persistence type of storages
   *        will be cleared.  If omitted (or void), all persistence types will
   *        be cleared for the principal.  If a single persistence type
   *        ("persistent", "temporary", or "default") is provided, then only
   *        that persistence directory will be considered.  Note that
   *        "persistent" is different than being "persisted" via persist() and
   *        is only for chrome principals.  See bug 1354500 for more info.
   *        In general, null is the right thing to pass here.
   * @param aClientType
   *        An optional string that tells what client type of storages
   *        will be cleared.  If omitted (or void), all client types will be
   *        cleared for the principal.  If a single client type is provided
   *        from Client.h, then only that client's storage will be cleared.
   *        If you want to clear multiple client types (but not all), then you
   *        must call this method multiple times.
   * @param aClearAll
   *        An optional boolean to indicate clearing all storages under the
   *        given origin.
   */
  [must_use] nsIQuotaRequest
  clearStoragesForPrincipal(in nsIPrincipal aPrincipal,
                            [optional] in ACString aPersistenceType,
                            [optional] in AString aClientType,
                            [optional] in boolean aClearAll);

  /**
   * Resets quota and storage management. This can be used to force
   * reinitialization of the temp storage, for example when the pref for
   * overriding the temp storage limit has changed.
   * Be carefull, this invalidates all live storages!
   *
   * If the dom.quotaManager.testing preference is not true the call will be
   * a no-op.
   */
  [must_use] nsIQuotaRequest
  reset();

  /**
   * Resets all storages stored for the given principal.
   *
   * If the dom.quotaManager.testing preference is not true the call will be
   * a no-op.
   *
   * @param aPrincipal
   *        A principal for the origin whose storages are to be reset.
   * @param aPersistenceType
   *        An optional string that tells what persistence type of storages
   *        will be reset.  If omitted (or void), all persistence types will
   *        be cleared for the principal.  If a single persistence type
   *        ("persistent", "temporary", or "default") is provided, then only
   *        that persistence directory will be considered.  Note that
   *        "persistent" is different than being "persisted" via persist() and
   *        is only for chrome principals.  See bug 1354500 for more info.
   *        In general, null is the right thing to pass here.
   * @param aClientType
   *        An optional string that tells what client type of storages
   *        will be reset.  If omitted (or void), all client types will be
   *        cleared for the principal.  If a single client type is provided
   *        from Client.h, then only that client's storage will be cleared.
   *        If you want to clear multiple client types (but not all), then you
   *        must call this method multiple times.
   */
  [must_use] nsIQuotaRequest
  resetStoragesForPrincipal(in nsIPrincipal aPrincipal,
                            [optional] in ACString aPersistenceType,
                            [optional] in AString aClientType);

  /**
   * Check if given origin is persisted.
   *
   * @param aPrincipal
   *        A principal for the origin which we want to check.
   */
  [must_use] nsIQuotaRequest
  persisted(in nsIPrincipal aPrincipal);

  /**
   * Persist given origin.
   *
   * @param aPrincipal
   *        A principal for the origin which we want to persist.
   */
  [must_use] nsIQuotaRequest
  persist(in nsIPrincipal aPrincipal);

  /**
   * Given an origin, asynchronously calculate its group quota usage and quota
   * limit. An origin's group is the set of all origins that share the same
   * eTLD+1. This method is intended to be used for our implementation of the
   * StorageManager.estimate() method. When we fix bug 1305665 and stop tracking
   * quota limits on a group basis, this method will switch to operating on
   * origins. Callers should strongly consider whether they want to be using
   * getUsageForPrincipal() instead.
   *
   * This mechanism uses cached quota values and does not perform any I/O on its
   * own, but it may be delayed by QuotaManager operations that do need to
   * perform I/O on the QuotaManager I/O thread.
   *
   * @param aPrincipal
   *        A principal for the origin (group) which we want to estimate.
   */
  [must_use] nsIQuotaRequest
  estimate(in nsIPrincipal aPrincipal);
};