# All files / src/stores store.js

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     import Reflux from 'reflux';
    import StateMixin from 'reflux-state-mixin';
    import toNS from 'mongodb-ns';
    import numeral from 'numeral';

    /**
     * Invalid stats.
     */
    const INVALID = 'N/A';

    /**
     * Collection Stats store.
     */
    const CollectionStatsStore = Reflux.createStore({
      /**
       * adds a state to the store, similar to React.Component's state
       * @see https://github.com/yonatanmn/Super-Simple-Flux#reflux-state-mixin
       *
       * If you call `this.setState({...})` this will cause the store to trigger
       * and push down its state as props to connected components.
       */
      mixins: [StateMixin.store],

      /**
       * This method is called when all plugins are activated. You can register
       * listeners to other plugins' stores here, e.g.
       *
       * appRegistry.getStore('OtherPlugin.Store').listen(this.otherStoreChanged.bind(this));
       *
       * If this plugin does not depend on other stores, you can delete the method.
       *
       * @param {Object} appRegistry - app registry containing all stores and components
       */
      // eslint-disable-next-line no-unused-vars
      onActivated(appRegistry) {
        this.NamespaceStore = appRegistry.getStore('App.NamespaceStore');
        this.CollectionStore = appRegistry.getStore('App.CollectionStore');
        appRegistry.getAction('CRUD.Actions').documentRemoved.listen(this.onDocumentDeleted.bind(this));
        appRegistry.on('data-service-connected', this.onConnected.bind(this));
        appRegistry.on('collection-changed', this.onCollectionChanged.bind(this));
      },

      /**
       * Handle the data-service-connected event.
       *
       * @param {Error} err - The error.
       * @param {DataService} dataService - The data service.
       */
      onConnected(err, dataService) {
        if (!err) {
          this.dataService = dataService;
        }
      },

      /**
       * Handle document deletion.
       */
      onDocumentDeleted() {
        this.loadCollectionStats(this.NamespaceStore.ns);
      },

      /**
       * Handle collection being changed.
       *
       * @param {String} ns - The namespace.
       */
      onCollectionChanged(ns) {
        this.loadCollectionStats(ns);
      },

      /**
       * Load the collection stats.
       *
       * @param {String} ns - The namespace.
       */
      loadCollectionStats(ns) {
        if (toNS(ns || '').collection) {
          if (this.CollectionStore.isReadonly()) {
            this.trigger();
          } else {
            this.dataService.collection(ns, {}, (err, result) => {
              if (!err) {
                this.setState(this._parseCollectionDetails(result));
              }
            });
          }
        }
      },

      /**
       * Initialize the Collection Stats store state. The returned object must
       * contain all keys that you might want to modify with this.setState().
       *
       * @return {Object} initial store state.
       */
      getInitialState() {
        return {
          documentCount: INVALID,
          totalDocumentSize: INVALID,
          avgDocumentSize: INVALID,
          indexCount: INVALID,
          totalIndexSize: INVALID,
          avgIndexSize: INVALID
        };
      },

      _parseCollectionDetails(result) {
        return {
          documentCount: this._format(result.document_count),
          totalDocumentSize: this._format(result.document_size, 'b'),
          avgDocumentSize: this._format(this._avg(result.document_size, result.document_count), 'b'),
          indexCount: this._format(result.index_count),
          totalIndexSize: this._format(result.index_size, 'b'),
          avgIndexSize: this._format(this._avg(result.index_size, result.index_count), 'b')
        };
      },

      _avg(size, count) {
        if (count <= 0) {
          return 0;
        }
        return size / count;
      },

      _format(value, format = 'a') {
        const precision = value <= 1000 ? '0' : '0.0';
        return numeral(value).format(precision + format);
      }
    });

    export default CollectionStatsStore;
    export { CollectionStatsStore };