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Filename : count-down.js
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'use strict';
function Util() { };
Util.setAttributes = function (el, attrs) {
    for (var key in attrs) {
        el.setAttribute(key, attrs[key]);
    }
};

(function () {
    var CountDown = function (element) {
        this.element = element;
        this.labels = this.element.getAttribute('data-labels') ? this.element.getAttribute('data-labels').split(',') : [];
        this.intervalId;
        // set visible labels
        this.setVisibleLabels();
        //create countdown HTML
        this.createCountDown();
        //store time elements
        this.days = this.element.getElementsByClassName('js-countdown__value--0')[0];
        this.hours = this.element.getElementsByClassName('js-countdown__value--1')[0];
        this.mins = this.element.getElementsByClassName('js-countdown__value--2')[0];
        this.secs = this.element.getElementsByClassName('js-countdown__value--3')[0];
        this.endTime = this.getEndTime();
        //init counter
        this.initCountDown();
    };

    CountDown.prototype.setVisibleLabels = function () {
        this.visibleLabels = this.element.getAttribute('data-visible-labels') ? this.element.getAttribute('data-visible-labels').split(',') : [];
        this.visibleLabels = this.visibleLabels.map(function (label) {
            return label.trim();
        });
    };

    CountDown.prototype.createCountDown = function () {
        var wrapper = document.createElement("div");
        Util.setAttributes(wrapper, { 'aria-hidden': 'true', 'class': 'countdown__timer' });

        for (var i = 0; i < 4; i++) {
            var timeItem = document.createElement("span"),
                timeValue = document.createElement("span"),
                timeLabel = document.createElement('span');

            timeItem.setAttribute('class', 'countdown__item');
            timeValue.setAttribute('class', 'countdown__value countdown__value--' + i + ' js-countdown__value--' + i);
            timeItem.appendChild(timeValue);

            if (this.labels && this.labels.length > 0) {
                timeLabel.textContent = this.labels[i].trim();
                timeLabel.setAttribute('class', 'countdown__label');
                timeItem.appendChild(timeLabel);
            }

            wrapper.appendChild(timeItem);
        }
        // append new content to countdown element
        this.element.insertBefore(wrapper, this.element.firstChild);
        // this.element.appendChild(wrapper);
    };

    CountDown.prototype.getEndTime = function () {
        // get number of remaining seconds
        if (this.element.getAttribute('data-timer')) return Number(this.element.getAttribute('data-timer')) * 1000 + new Date().getTime();
        else if (this.element.getAttribute('data-countdown')) return Number(new Date(this.element.getAttribute('data-countdown')).getTime());
    };

    CountDown.prototype.initCountDown = function () {
        var self = this;
        this.intervalId = setInterval(function () {
            self.updateCountDown(false);
        }, 1000);
        this.updateCountDown(true);
    };

    CountDown.prototype.updateCountDown = function (bool) {
        // original countdown function
        // https://gist.github.com/adriennetacke/f5a25c304f1b7b4a6fa42db70415bad2
        var time = parseInt((this.endTime - new Date().getTime()) / 1000),
            days = 0,
            hours = 0,
            mins = 0,
            seconds = 0;

        if (isNaN(time) || time < 0) {
            clearInterval(this.intervalId);
            this.emitEndEvent();
        } else {
            days = parseInt(time / 86400);
            time = (time % 86400);
            hours = parseInt(time / 3600);
            time = (time % 3600);
            mins = parseInt(time / 60);
            time = (time % 60);
            seconds = parseInt(time);
        }

        // hide days/hours/mins if not available
        if (bool && days == 0 && this.visibleLabels.indexOf('d') < 0) this.days.parentElement.style.display = "none";
        if (bool && days == 0 && hours == 0 && this.visibleLabels.indexOf('h') < 0) this.hours.parentElement.style.display = "none";
        if (bool && days == 0 && hours == 0 && mins == 0 && this.visibleLabels.indexOf('m') < 0) this.mins.parentElement.style.display = "none";

        this.days.textContent = this.getTimeFormat(days);
        this.hours.textContent = this.getTimeFormat(hours);
        this.mins.textContent = this.getTimeFormat(mins);
        this.secs.textContent = this.getTimeFormat(seconds);
        this.days.textContent = this.getTimeFormat(days);
    };

    CountDown.prototype.getTimeFormat = function (time) {
        return ('0' + time).slice(-2);
    };

    CountDown.prototype.emitEndEvent = function (time) {
        var event = new CustomEvent('countDownFinished');
        this.element.dispatchEvent(event);
    };

    // Functions calling
    window.addEventListener('load', function () {
        //initialize the CountDown objects
        /*        window.setTimeout(() => {*/
        var countDown = document.getElementsByClassName('js-countdown');
        if (countDown.length > 0) {
            for (var i = 0; i < countDown.length; i++) {
                (function (i) {
                    new CountDown(countDown[i]);
                })(i);
            }
        }
        /*      }, 1000);*/

    });
}());