module.exports = {

    /**
    * Parse second to 00:00 format
    *
    * @param {Number} second
    * @return {String} 00:00 format
    */
    secondToTime: (second) => {
        const add0 = (num) => num < 10 ? '0' + num : '' + num;
        const min = parseInt(second / 60);
        const sec = parseInt(second - min * 60);
        return add0(min) + ':' + add0(sec);
    },

    /**
     * control play progress
     */
    // get element's view position
    getElementViewLeft: (element) => {
        let actualLeft = element.offsetLeft;
        let current = element.offsetParent;
        const elementScrollLeft = document.body.scrollLeft + document.documentElement.scrollLeft;
        if (!document.fullscreenElement && !document.mozFullScreenElement && !document.webkitFullscreenElement) {
            while (current !== null) {
                actualLeft += current.offsetLeft;
                current = current.offsetParent;
            }
        }
        else {
            while (current !== null && current !== element) {
                actualLeft += current.offsetLeft;
                current = current.offsetParent;
            }
        }
        return actualLeft - elementScrollLeft;
    },

    getScrollPosition () {
        return {
            left: window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft || 0,
            top: window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop || 0
        };
    },

    setScrollPosition ({left = 0, top = 0}) {
        if (this.isFirefox) {
            document.documentElement.scrollLeft = left;
            document.documentElement.scrollTop = top;
        }
        else {
            window.scrollTo(left, top);
        }
    },

    /**
     * check if user is using mobile or not
     */
    isMobile: /mobile/i.test(window.navigator.userAgent),

    isFirefox: /firefox/i.test(window.navigator.userAgent),

    isChrome: /chrome/i.test(window.navigator.userAgent),

    storage: {
        set: (key, value) => {
            localStorage.setItem(key, value);
        },

        get: (key) => localStorage.getItem(key)
    }

};