phodal/echoesworks

/*!
 * Bespoke.js v1.0.0
 *
 * Copyright 2014, Mark Dalgleish
 * This content is released under the MIT license
 * http://mit-license.org/markdalgleish
 */

/*jshint -W030 */

var from = function () {

    var element = this.options.element,
        parent = element.nodeType === 1 ? element : document.querySelector(element),
        slides = [].filter.call(parent.children, function (el) {
            return el.nodeName !== 'SCRIPT';
        }),
        activeSlide = slides[0],
        listeners = {},

        readURL = function () {
            var hash = window.location.hash,
                current = hash.replace(/#|\//gi, '');

            if (current > 0) {
                activate(current);
            } else {
                activate(0);
            }
        },

        activate = function (index, customData) {
            if (!slides[index]) {
                return;
            }

            activeSlide.className = activeSlide.className.replace(new RegExp('active' + '(\\s|$)', 'g'), ' ').trim();
            activeSlide.classList.add('past');

            fire('deactivate', createEventData(activeSlide, customData));
            activeSlide = slides[index];
            activeSlide.className = 'active';
            var isLastSlide = parseInt(index, 10) === (slides.length - 1);
            var isFirstSlide = parseInt(index, 10) === 0;
            if(isFirstSlide || isLastSlide) {
                activeSlide.classList.add('specify');
            }
            window.bar.go(100 * ( index + 1) / slides.length);
            writeURL(index);
            localStorage.setItem('echoesworks', index);
            fire('activate', createEventData(activeSlide, customData));
        },

        slide = function (index, customData) {
            if (arguments.length) {
                fire('slide', createEventData(slides[index], customData)) && activate(index, customData);
            } else {
                return slides.indexOf(activeSlide);
            }
        },

        writeURL = function (index) {
            window.location.hash = '#/' + index;
        },

        step = function (offset, customData) {
            var slideIndex = slides.indexOf(activeSlide) + offset;

            fire(offset > 0 ? 'next' : 'prev', createEventData(activeSlide, customData)) && activate(slideIndex, customData);
        },

        on = function (eventName, callback) {
            (listeners[eventName] || (listeners[eventName] = [])).push(callback);

            return function () {
                listeners[eventName] = listeners[eventName].filter(function (listener) {
                    return listener !== callback;
                });
            };
        },

        fire = function (eventName, eventData) {
            return (listeners[eventName] || [])
                .reduce(function (notCancelled, callback) {
                    return notCancelled && callback(eventData) !== false;
                }, true);
        },

        createEventData = function (el, eventData) {
            eventData = eventData || {};
            eventData.index = slides.indexOf(el);
            eventData.slide = el;
            return eventData;
        },

        deck = {
            on: on,
            fire: fire,
            slide: slide,
            next: step.bind(null, 1),
            prev: step.bind(null, -1),
            parent: parent,
            slides: slides,
            auto: false
        };

    readURL();
    window.slide = deck;

    return deck;
};

EchoesWorks.prototype = EchoesWorks.extend(EchoesWorks.prototype, {slide: from});