text: import {EventEmitter} from "events";
  
  import {AllAppConfigDefaultValues} from "../constants/AppConfigDefaults";
  import AppConfigTransforms from "./transforms/AppConfigTransforms";
  import AppDispatcher from "../AppDispatcher";
  import appScheme from "../stores/schemes/appScheme";
  import AppVersionsEvents from "../events/AppVersionsEvents";
  import Util from "../helpers/Util";
  
  const storeData = {
    appVersions: {},
    availableAppVersions: [],
    currentAppId: null
  };
  
  function processAppVersion(appVersion) {
    return Util.extendObject(appScheme, appVersion);
  }
  
  var AppVersionsStore = Util.extendObject(EventEmitter.prototype, {
    // Already requested versions with version timestamp as key
    get appVersions() {
      return Util.deepCopy(storeData.appVersions);
    },
    // List of the available version timestamps
    get availableAppVersions() {
      return Util.deepCopy(storeData.availableAppVersions);
    },
    // appId where the app versions belong to
    get currentAppId() {
      return storeData.currentAppId;
    },
  
    resetOnAppChange: function (appId) {
      if (appId !== storeData.currentAppId) {
        storeData.availableAppVersions = [];
        storeData.appVersions = {};
        storeData.currentAppId = appId;
      }
    },
  
    getAppVersions: function (appId) {
      if (appId === storeData.currentAppId) {
        return this.availableAppVersions
          .sort(function (a, b) {
            if (a < b) {
              return 1;
            }
            if (a > b) {
              return -1;
            }
            return 0;
          });
      }
      return [];
    },
  
    getAppVersion: function (appId, appVersionTimestamp) {
      if (appId === storeData.currentAppId) {
        return Util.deepCopy(this.appVersions[appVersionTimestamp]) || {};
      }
      return {};
    },
  
    // every significant field in the full definition returned from the
    // versions endpoint
    getAppConfigVersion: function (appId, appVersionTimestamp) {
      var version = this.getAppVersion(appId, appVersionTimestamp);
      return Object.keys(version).reduce((memo, key) => {
        if (AllAppConfigDefaultValues.hasOwnProperty(key)) {
          let defaultVal = AllAppConfigDefaultValues[key];
          let val = version[key];
          if (!Util.isEgal(val, defaultVal)) {
            memo[key] = val;
          }
        }
        return memo;
      }, {});
    },
  
    // Diff the new configuration against the current app settings
    getAppConfigDiff: function (appId, newConfig) {
      var allVersions = this.getAppVersions(appId);
      if (allVersions.length === 0) {
        return newConfig;
      }
      var latestVersion = allVersions[0];
      return AppConfigTransforms.diff(this.appVersions[latestVersion], newConfig);
    }
  
  });
  
  AppDispatcher.register(function (action) {
    switch (action.actionType) {
      case AppVersionsEvents.REQUEST_VERSION_TIMESTAMPS:
        AppVersionsStore.resetOnAppChange(action.appId);
        storeData.availableAppVersions = action.data.body.versions;
        AppVersionsStore.emit(AppVersionsEvents.CHANGE, action.appId);
        break;
      case AppVersionsEvents.REQUEST_VERSION_TIMESTAMPS_ERROR:
        AppVersionsStore.emit(
          AppVersionsEvents.REQUEST_VERSION_TIMESTAMPS_ERROR,
          action.data.body,
          action.appId
        );
        break;
      case AppVersionsEvents.REQUEST_ONE:
        AppVersionsStore.resetOnAppChange(action.appId);
        storeData.appVersions[action.versionTimestamp] =
          processAppVersion(action.data.body);
        AppVersionsStore.emit(AppVersionsEvents.CHANGE, action.versionTimestamp);
        break;
      case AppVersionsEvents.REQUEST_ONE_ERROR:
        AppVersionsStore.emit(
          AppVersionsEvents.REQUEST_ONE_ERROR,
          action.data.body,
          action.versionTimestamp
        );
        break;
    }
  });
  
  export default AppVersionsStore;
  