icrosil/remob

import get from 'lodash/get';
import mapValues from 'lodash/mapValues';
import merge from 'lodash/merge';

import Reducer from './Reducer';

const mapSelectorsToDispatch = (selectors, state, statePath, opts) => ({
  ...get(state, statePath),
  ...mapValues(selectors, (selector, selectorKey) => {
    if (typeof selector === 'function') {
      return selector(get(state, statePath), state, opts);
    }
    const path = Reducer.getActionName(statePath, selectorKey);
    return mapSelectorsToDispatch(selector, state, path, opts);
  }),
});

const mapActionToDispatch = (actions, store, dispatch, opts, actionPrefix = '') =>
  mapValues(actions, (action, actionKey) => {
    const path = Reducer.getActionName(actionPrefix, actionKey);
    if (typeof action === 'function') {
      return value => get(store, path)(dispatch, { opts, value });
    }
    return mapActionToDispatch(action, store, dispatch, opts, path);
  });

const mergeProps = (stateProps, dispatchProps, ownProps) => merge({}, stateProps, dispatchProps, ownProps);

/**
 * injector to combine actions, state, selectors and pass it to component as props
 * @method
 * @param  {Object} stores remob instances
 * @return {Array}         mappers and merge function
 */
export default stores => {
  const stateMappers = (state, opts) =>
    mapValues(stores, (store, storeKey) => mapSelectorsToDispatch(store.selectors, state, storeKey, opts));
  const dispatchMappers = (dispatch, opts) =>
    mapValues(stores, store => mapActionToDispatch(store.actions, store, dispatch, opts));
  const mapState = (state, ...args) => stateMappers(state, args);
  const mapDispatch = (dispatch, ...args) => dispatchMappers(dispatch, args);
  return [mapState, mapDispatch, mergeProps];
};