// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

const Crostini = {};

/**
 * Maintains a list of paths shared with the crostini container.
 * Keyed by VolumeManagerCommon.RootType, with boolean set values
 * of string paths.  e.g. {'Downloads': {'/foo': true, '/bar': true}}.
 * @private @dict {!Object<!Object<boolean>>}
 */
Crostini.SHARED_PATHS_ = {};

/**
 * Add entry as a shared path.
 * @param {!Entry} entry
 * @param {!VolumeManagerWrapper} volumeManager
 */
Crostini.addSharedPath = function(entry, volumeManager) {
  const root = volumeManager.getLocationInfo(entry).rootType;
  let paths = Crostini.SHARED_PATHS_[root];
  if (!paths) {
    paths = {};
    Crostini.SHARED_PATHS_[root] = paths;
  }
  paths[entry.fullPath] = true;
};

/**
 * Returns true if entry is shared.
 * @param {!Entry} entry
 * @param {!VolumeManagerWrapper} volumeManager
 * @return {boolean} True if path is shared either by a direct
 * share or from one of its ancestor directories.
 */
Crostini.isPathShared = function(entry, volumeManager) {
  const root = volumeManager.getLocationInfo(entry).rootType;
  const paths = Crostini.SHARED_PATHS_[root];
  if (!paths)
    return false;
  // Check path and all ancestor directories.
  let path = entry.fullPath;
  while (path != '') {
    if (paths[path])
      return true;
    path = path.substring(0, path.lastIndexOf('/'));
  }
  return false;
};

/**
 * @param {!Entry} entry
 * @param {!VolumeManagerWrapper} volumeManager
 * @return {boolean} True if the entry is from crostini.
 */
Crostini.isCrostiniEntry = function(entry, volumeManager) {
  return volumeManager.getLocationInfo(entry).rootType ===
      VolumeManagerCommon.RootType.CROSTINI;
};