bencripps / react-redux-grid

let num = 0;

const REDUCER_KEYS = {

    BulkActions: 'bulkaction',

    DataSource: 'dataSource',

    Editor: 'editor',

    ErrorHandler: 'errorhandler',

    Grid: 'grid',

    Loader: 'loader',

    Menu: 'menu',

    Pager: 'pager',

    Selection: 'selection'

};

export const generateLastUpdate = () => ++num;

export const resetLastUpdate = () => { num = 0; };

export const getLastUpdate = (store, key, reducerKeys = REDUCER_KEYS) => {

    if (typeof reducerKeys === 'string') {

        const state = store.getState().get

            ? store.getState().get(reducerKeys)

            : store.getState()[reducerKeys];

        return updateGetter(

            state,

            REDUCER_KEYS,

            Object.keys(REDUCER_KEYS),

            key

        );

    }

    const dynamicReducerKeys = typeof reducerKeys === 'object'

        && Object.keys(reducerKeys).length > 0

        ? reducerKeys

        : REDUCER_KEYS;

    return updateGetter(

        store.getState(),

        dynamicReducerKeys,

        Object.keys(REDUCER_KEYS),

        key

    );

};

export const updateGetter = (state, reducerKeys, keys, key) =>

    keys.reduce((prev, reducerAccessor) => {

        const reducerKey = reducerKeys[reducerAccessor];

        const stateMap = (typeof state.get === 'function')

            ? state.get(reducerKey)

            : state[reducerKey];

        if (stateMap && stateMap.toJS) {

            prev[reducerKey] = stateMap.getIn([key, 'lastUpdate']);

        }

        else if (typeof stateMap === 'object' && stateMap[key]) {

            prev[reducerKey] = stateMap[key].lastUpdate;

        }

        return prev;

    }, {});