phodal/echoesworks

/* global EchoesWorks */

/*jshint unused:false, eqnull:true */
/* global window, navigator */

(function (document) {
    'use strict';

    var TAB = 9,
        SPACE = 32,
        PAGE_DOWN = 34,
        LEFT = 37,
        RIGHT = 39,
        DOWN = 40,
        PAGE_UP = 33,
        UP = 38,
        slide,
        slides,
        start,
        dragging;

    var isTouchDevice = function () {
        return 'ontouchstart' in window || navigator.msMaxTouchPoints;
    };

    function stopAutoPlay() {
        window.slide.auto = false;
    if(!!window.ew && !!window.ew.audio) {
      window.ew.audio.pause();
    }
    }

    function touchDeviceHandler() {
        EchoesWorks.forEach(slides, function (slide) {
            var halfWidth = window.screen.width / 3,
                thirdHeight = window.screen.height / 3,
                delta;

            slide.addEventListener('touchstart', function (event) {
                start = {
                    x: event.touches[0].pageX,
                    y: event.touches[0].pageY
                };
                dragging = true;
            });

            slide.addEventListener('touchend', function () {
                dragging = false;
            });

            slide.addEventListener('touchmove', function (event) {
                if (dragging) {
                    event.preventDefault();
                    delta = {
                        x: event.touches[0].pageX - start.x,
                        y: event.touches[0].pageY - start.y
                    };

                    var lastX = delta.x > 0 && (delta.x > halfWidth);
                    var nextY = delta.y > 0 && (delta.y > thirdHeight);
                    var nextX = delta.x < 0 && (Math.abs(delta.x) > halfWidth);
                    var lastY = delta.y < 0 && (Math.abs(delta.y) > thirdHeight);

                    if (nextX || nextY) {
                        window.slide.next();
                        dragging = false;
                    } else if (lastX || lastY) {
                        window.slide.prev();
                        dragging = false;
                    }
                }
                stopAutoPlay();
            });
        });
    }

    function syncSliderEventHandler() {
        function handler() {
            window.slide.slide(parseInt(localStorage.getItem('echoesworks'), 10));
        }

        if (window.addEventListener) {
            window.addEventListener("storage", handler, false);
        } else {
            window.attachEvent("onstorage", handler);
        }
    }

    document.addEventListener("ew:slide:init", function () {
        slides = document.getElementsByTagName('section');
        syncSliderEventHandler();

        if (slides && isTouchDevice && window.slide) {
            touchDeviceHandler();
        }

        document.addEventListener("keydown", function (event) {
            stopAutoPlay();
            var keyCode = event.keyCode;
            if (keyCode === TAB || ( keyCode >= SPACE && keyCode <= PAGE_DOWN ) || (keyCode >= LEFT && keyCode <= DOWN)) {
                event.preventDefault();
            }
        }, false);

        document.addEventListener("keyup", function (event) {
            var keyCode = event.keyCode;
            if (keyCode === TAB || ( keyCode >= SPACE && keyCode <= PAGE_DOWN ) || (keyCode >= LEFT && keyCode <= DOWN)) {
                switch (keyCode) {
                    case  PAGE_UP:
                    case  LEFT:
                    case  UP:
                        window.slide.prev();
                        break;
                    case TAB:
                    case SPACE:
                    case PAGE_DOWN:
                    case  RIGHT:
                    case DOWN:
                        window.slide.next();
                        break;
                }

                event.preventDefault();
            }
        });
    });
}(document));