/* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 40 -*- */
/* vim: set ts=2 et sw=2 tw=40: */
/* 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"

/**
 * The result of a successful asynchronous operation.
 */
[scriptable, builtinclass, uuid(08B4CF29-3D65-4E79-B522-A694C322ED07)]
interface nsINativeOSFileResult: nsISupports
{
  /**
   * The actual value produced by the operation.
   *
   * Actual type of this value depends on the options passed to the
   * operation.
   */
  [implicit_jscontext]
  readonly attribute jsval result;

  /**
   * Delay between when the operation was requested on the main thread and
   * when the operation was started off main thread.
   */
  readonly attribute double dispatchDurationMS;

  /**
   * Duration of the off main thread execution.
   */
  readonly attribute double executionDurationMS;
};

/**
 * A callback invoked in case of success.
 */
[scriptable, function, uuid(2C1922CA-CA1B-4099-8B61-EC23CFF49412)]
interface nsINativeOSFileSuccessCallback: nsISupports
{
  void complete(in nsINativeOSFileResult result);
};

/**
 * A callback invoked in case of error.
 */
[scriptable, function, uuid(F612E0FC-6736-4D24-AA50-FD661B3B40B6)]
interface nsINativeOSFileErrorCallback: nsISupports
{
  /**
   * @param operation The name of the failed operation. Provided to aid
   * debugging only, may change without notice.
   * @param OSstatus The OS status of the operation (errno under Unix,
   * GetLastError under Windows).
   */
  void complete(in ACString operation, in long OSstatus);
};

/**
 * A service providing native implementations of some of the features
 * of OS.File.
 */
[scriptable, builtinclass, uuid(913362AD-1526-4623-9E6B-A2EB08AFBBB9)]
interface nsINativeOSFileInternalsService: nsISupports
{
  /**
   * Implementation of OS.File.read
   *
   * @param path The absolute path to the file to read.
   * @param options An object that may contain some of the following fields
   * - {number} bytes The maximal number of bytes to read.
   * - {string} encoding If provided, return the result as a string, decoded
   *   using this encoding. Otherwise, pass the result as an ArrayBuffer.
   *   Invalid encodings cause onError to be called with the platform-specific
   *   "invalid argument" constant.
   * - {string} compression Unimplemented at the moment.
   * @param onSuccess The success callback.
   * @param onError The error callback.
   */
  [implicit_jscontext]
  void read(in AString path, in jsval options,
            in nsINativeOSFileSuccessCallback onSuccess,
            in nsINativeOSFileErrorCallback onError);

  /**
   * Implementation of OS.File.writeAtomic
   *
   * @param path the absolute path of the file to write to.
   * @param buffer the data as an array buffer to be written to the file.
   * @param options An object that may contain the following fields
   * - {number} bytes If provided, the number of bytes written is equal to this.
   *   The default value is the size of the |buffer|.
   * - {string} tmpPath If provided and not null, first write to this path, and
   *   move to |path| after writing.
   * - {string} backupPath if provided, backup file at |path| to this path
   *   before overwriting it.
   * - {bool} flush if provided and true, flush the contents of the buffer after
   *   writing. This is slower, but safer.
   * - {bool} noOverwrite if provided and true, do not write if a file already
   *   exists at |path|.
   * @param onSuccess The success callback.
   * @param onError The error callback.
   */
  [implicit_jscontext]
  void writeAtomic(in AString path,
                   in jsval buffer,
                   in jsval options,
                   in nsINativeOSFileSuccessCallback onSuccess,
                   in nsINativeOSFileErrorCallback onError);

};


%{ C++

#define NATIVE_OSFILE_INTERNALS_SERVICE_CID {0x63A69303,0x8A64,0x45A9,{0x84, 0x8C, 0xD4, 0xE2, 0x79, 0x27, 0x94, 0xE6}}
#define NATIVE_OSFILE_INTERNALS_SERVICE_CONTRACTID "@mozilla.org/toolkit/osfile/native-internals;1"

%}