/* 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/. */

/**
 *
 * Some helpers for common operations in the App Manager:
 *
 *  . mergeStores: merge several store into one.
 *  . l10n: resolves strings from app-manager.properties.
 *
 */

let Utils = (function() {
  const Cu = Components.utils;
  const {Services} = Cu.import("resource://gre/modules/Services.jsm", {});
  const {devtools} = Cu.import("resource://gre/modules/devtools/Loader.jsm", {});
  const {require} = devtools;
  const EventEmitter = require("devtools/shared/event-emitter");


  function _forwardSetEvent(key, store, finalStore) {
    store.on("set", function(event, path, value) {
      finalStore.emit("set", [key].concat(path), value);
    });
  }

  function mergeStores(stores) {
    let finalStore = {object:{}};
    EventEmitter.decorate(finalStore);
    for (let key in stores) {
      finalStore.object[key] = stores[key].object,
      _forwardSetEvent(key, stores[key], finalStore);
    }
    return finalStore;
  }


  let strings = Services.strings.createBundle("chrome://browser/locale/devtools/app-manager.properties");

  function l10n (property, args = []) {
    if (args && args.length > 0) {
      return strings.formatStringFromName(property, args, args.length);
    } else {
      return strings.GetStringFromName(property);
    }
  }

  return {
    mergeStores: mergeStores,
    l10n: l10n
  }
})();