"use strict";

import EventEmitter from 'event-emitter';
import {createStore, compose, applyMiddleware} from 'redux';
import {composeReducers} from 'redux-sac';
import {effectsMiddleware} from 'redux-effex';
import {persistStore, autoRehydrate} from 'redux-persist';
import {REHYDRATE} from 'redux-persist/constants';
import createActionBuffer from 'redux-action-buffer';

export default () => {
    const ee = new EventEmitter();

    function on (event, handler) {
        ee.on(event, handler);
        return this;
    }

    let persistOptions = {};

    function withPersistence (_persistOptions) {
        persistOptions = _persistOptions;
        return this;
    }

    let reducers = [], effects = [];

    function withReducers (..._reducers) {
        reducers.push(..._reducers);
        return this;
    }

    function withEffects (..._effects) {
        effects.push(..._effects);
        return this;
    }

    function create (reset = false) {
        const store = createStore(
            composeReducers(...reducers),
            compose(
                autoRehydrate(),
                applyMiddleware(createActionBuffer(REHYDRATE), effectsMiddleware(effects))
            )
        );

        const persistor = persistStore(store, persistOptions, err => {
            if (err) ee.emit('error', err);
            else ee.emit('rehydrate', store);
        });

        if (reset) persistor.purge();

        return store;
    }

    return {withReducers, withEffects, withPersistence, on, create};
}