import rootReducer from '../reducers';

import { createStore, applyMiddleware } from 'redux';

import { routerMiddleware } from 'react-router-redux';

import Immutable from 'immutable';

const loadState = () => {

  try {

    const serializedState = localStorage.getItem('state');

    if (!serializedState) {

      return {};

    }

    return JSON.parse(serializedState);

}

const saveState = (state) => {

  try {

    localStorage.setItem('state', JSON.stringify(state));

  } catch (err) {}

}

const savedState = loadState();

const defaultState = {

  currentSession: null,

  sessions: Immutable.List(savedState.sessions || []),

  notes: Immutable.List(savedState.notes || []),

  isAuthenticated: false,

};

const storeInitialState = Immutable.Map(defaultState);

export default (history, initialState = storeInitialState) => {

  const middleware = routerMiddleware(history);

  const store = createStore(rootReducer, initialState, applyMiddleware(middleware));

  store.subscribe(() => {

    const state = store.getState().toJSON();

    const stateToPersist = {

      sessions: state.sessions,

      notes: state.notes,

    };

    saveState(stateToPersist);

  });

  return store;

};