/**
 * @license
 * Copyright Stbui All Rights Reserved.
 * https://github.com/stbui
 */

import { Reducer } from 'redux';
import { FETCH_CANCEL, FETCH_END, FETCH_ERROR, FETCH_START } from '../actions';

const loadingReducer: Reducer<any> = (previousState = 0, { type }) => {
    switch (type) {
        case FETCH_START:
            return previousState + 1;
        case FETCH_CANCEL:
        case FETCH_END:
        case FETCH_ERROR:
            return Math.max(previousState - 1, 0);
        default:
            return previousState;
    }
};

export default loadingReducer;