/* eslint-disable no-underscore-dangle */
import { createStore, applyMiddleware, compose } from 'redux';
import createSagaMiddleware, { END } from 'redux-saga';
import thunk from 'redux-thunk';
import createReducer from './reducers';

/**
 * Create a new store with the given initial state. Adds Redux
 * middleware and enhancers.
 */
export default function configureStore(sdk, initialState = {}) {
  const sagaMiddleware = createSagaMiddleware();

  const middlewares = [thunk.withExtraArgument(sdk), sagaMiddleware];

  // Enable Redux Devtools in client side dev mode.
  const composeEnhancers = process.env.NODE_ENV !== 'production' &&
    typeof window === 'object' &&
    window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__
    ? window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__
    : compose;

  const enhancer = composeEnhancers(applyMiddleware(...middlewares));

  const store = createStore(createReducer(), initialState, enhancer);
  store.runSaga = sagaMiddleware.run;
  store.closeSagaMiddleware = () => store.dispatch(END);

  return store;
}