// -----------------------------------------------------------------------------------
//
//        Lightbox Slideshow v1.1
//        by Justin Barkhuff - http://www.justinbarkhuff.com/lab/lightbox_slideshow/
//  Updated: 2007-08-15
//
//        Largely based on Lightbox v2.02
//        by Lokesh Dhakar - http://huddletogether.com/projects/lightbox2/
//        3/31/06
//
//        Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
//
//        The code inserts html at the bottom of the page that looks similar to this:
//
//        <div id="overlay"></div>
//        <div id="lightbox">
//                <div id="outerImageContainer">
//                        <div id="imageContainer">
//                                <img id="lightboxImage" />
//                                <div id="hoverNav">
//                                        <a href="javascript:void(0);" id="prevLinkImg">&laquo; prev</a>
//                                        <a href="javascript:void(0);" id="nextLinkImg">next &raquo;</a>
//                                </div>
//                                <div id="loading">
//                                        <a href="javascript:void(0);" id="loadingLink">loading</a>
//                                </div>
//                        </div>
//                </div>
//                <div id="imageDataContainer">
//                        <div id="imageData">
//                                <div id="imageDetails">
//                                        <span id="caption"></span>
//                                        <span id="numberDisplay"></span>
//                                        <span id="detailsNav">
//                                                <a id="prevLinkDetails" href="javascript:void(0);">&laquo; prev</a>
//                                                <a id="nextLinkDetails" href="javascript:void(0);">next &raquo;</a>
//                                                <a id="slideShowControl" href="javascript:void(0);">stop slideshow</a>
//                                        </span>
//                                </div>
//                                <div id="close">
//                                        <a id="closeLink" href="javascript:void(0);">close</a>
//                                </div>
//                        </div>
//                </div>
//        </div>
//
// -----------------------------------------------------------------------------------

//
//        Lightbox Object
//

var Lightbox = {
        activeImage : null,
        badObjects : ['select','object','embed'],
        container : null,
        enableSlideshow : null,
        groupName : null,
        imageArray : [],
        options : null,
        overlayDuration : null,
        overlayOpacity : null,
        playSlides : null,
        refTags : ['a','area'],
        relAttribute : null,
        resizeDuration : null,
        slideShowTimer : null,
        startImage : null,

        //
        // initialize()
        // Constructor sets class properties and configuration options and
        // inserts html at the bottom of the page which is used to display the shadow
        // overlay and the image container.
        //
        initialize: function(options) {
                if (!document.getElementsByTagName){ return; }

                this.options = $H({
                        animate : true, // resizing animations
                        autoPlay : true, // should slideshow start automatically
                        borderSize : 10, // if you adjust the padding in the CSS, you will need to update this variable
                        containerID : document, // lightbox container object
                        enableSlideshow : true, // enable slideshow feature
                        googleAnalytics : false, // track individual image views using Google Analytics
                        imageDataLocation : 'south', // location of image caption information
                        initImage : '', // ID of image link to automatically launch when upon script initialization
                        loop : true, // whether to continuously loop slideshow images
                        overlayDuration : .2, // time to fade in shadow overlay
                        overlayOpacity : .8, // transparency of shadow overlay
                        prefix : '', // ID prefix for all dynamically created html elements
                        relAttribute : 'lightbox', // specifies the rel attribute value that triggers lightbox
                        resizeSpeed : 7, // controls the speed of the image resizing (1=slowest and 10=fastest)
                        showGroupName : false, // show group name of images in image details
                        slideTime : 4, // time to display images during slideshow
                        strings : { // allows for localization
                                closeLink : 'close',
                                loadingMsg : 'loading',
                                nextLink : 'next &raquo;',
                                prevLink : '&laquo; prev',
                                startSlideshow : 'start slideshow',
                                stopSlideshow : 'stop slideshow',
                                numDisplayPrefix : 'Image',
                                numDisplaySeparator : 'of'
                        }
        }).merge(options);

                if(this.options.animate){
                        this.overlayDuration = Math.max(this.options.overlayDuration,0);
                        this.options.resizeSpeed = Math.max(Math.min(this.options.resizeSpeed,10),1);
                        this.resizeDuration = (11 - this.options.resizeSpeed) * 0.15;
                }else{
                        this.overlayDuration = 0;
                        this.resizeDuration = 0;
                }

                this.enableSlideshow = this.options.enableSlideshow;
                this.overlayOpacity = Math.max(Math.min(this.options.overlayOpacity,1),0);
                this.playSlides = this.options.autoPlay;
                this.container = $(this.options.containerID);
                this.relAttribute = this.options.relAttribute;
                this.updateImageList();

                var objBody = this.container != document ? this.container : document.getElementsByTagName('body').item(0);

                var objOverlay = document.createElement('div');
                objOverlay.setAttribute('id',this.getID('overlay'));
                objOverlay.style.display = 'none';
                objBody.appendChild(objOverlay);
                Event.observe(objOverlay,'click',this.end.bindAsEventListener(this));

                var objLightbox = document.createElement('div');
                objLightbox.setAttribute('id',this.getID('lightbox'));
                objLightbox.style.display = 'none';
                objBody.appendChild(objLightbox);

                var objImageDataContainer = document.createElement('div');
                objImageDataContainer.setAttribute('id',this.getID('imageDataContainer'));
                objImageDataContainer.className = this.getID('clearfix');

                var objImageData = document.createElement('div');
                objImageData.setAttribute('id',this.getID('imageData'));
                objImageDataContainer.appendChild(objImageData);

                var objImageDetails = document.createElement('div');
                objImageDetails.setAttribute('id',this.getID('imageDetails'));
                objImageData.appendChild(objImageDetails);

                var objCaption = document.createElement('span');
                objCaption.setAttribute('id',this.getID('caption'));
                objImageDetails.appendChild(objCaption);

                var objNumberDisplay = document.createElement('span');
                objNumberDisplay.setAttribute('id',this.getID('numberDisplay'));
                objImageDetails.appendChild(objNumberDisplay);

                var objDetailsNav = document.createElement('span');
                objDetailsNav.setAttribute('id',this.getID('detailsNav'));
                objImageDetails.appendChild(objDetailsNav);

                var objPrevLink = document.createElement('a');
                objPrevLink.setAttribute('id',this.getID('prevLinkDetails'));
                objPrevLink.setAttribute('href','javascript:void(0);');
                objPrevLink.innerHTML = this.options.strings.prevLink;
                objDetailsNav.appendChild(objPrevLink);
                Event.observe(objPrevLink,'click',this.showPrev.bindAsEventListener(this));

                var objNextLink = document.createElement('a');
                objNextLink.setAttribute('id',this.getID('nextLinkDetails'));
                objNextLink.setAttribute('href','javascript:void(0);');
                objNextLink.innerHTML = this.options.strings.nextLink;
                objDetailsNav.appendChild(objNextLink);
                Event.observe(objNextLink,'click',this.showNext.bindAsEventListener(this));

                var objSlideShowControl = document.createElement('a');
                objSlideShowControl.setAttribute('id',this.getID('slideShowControl'));
                objSlideShowControl.setAttribute('href','javascript:void(0);');
                objDetailsNav.appendChild(objSlideShowControl);
                Event.observe(objSlideShowControl,'click',this.toggleSlideShow.bindAsEventListener(this));

                var objClose = document.createElement('div');
                objClose.setAttribute('id',this.getID('close'));
                objImageData.appendChild(objClose);

                var objCloseLink = document.createElement('a');
                objCloseLink.setAttribute('id',this.getID('closeLink'));
                objCloseLink.setAttribute('href','javascript:void(0);');
                objCloseLink.innerHTML = this.options.strings.closeLink;
                objClose.appendChild(objCloseLink);
                Event.observe(objCloseLink,'click',this.end.bindAsEventListener(this));

                if(this.options.imageDataLocation == 'north'){
                        objLightbox.appendChild(objImageDataContainer);
                }

                var objOuterImageContainer = document.createElement('div');
                objOuterImageContainer.setAttribute('id',this.getID('outerImageContainer'));
                objLightbox.appendChild(objOuterImageContainer);

                var objImageContainer = document.createElement('div');
                objImageContainer.setAttribute('id',this.getID('imageContainer'));
                objOuterImageContainer.appendChild(objImageContainer);

                var objLightboxImage = document.createElement('img');
                objLightboxImage.setAttribute('id',this.getID('lightboxImage'));
                objImageContainer.appendChild(objLightboxImage);

                var objHoverNav = document.createElement('div');
                objHoverNav.setAttribute('id',this.getID('hoverNav'));
                objImageContainer.appendChild(objHoverNav);

                var objPrevLinkImg = document.createElement('a');
                objPrevLinkImg.setAttribute('id',this.getID('prevLinkImg'));
                objPrevLinkImg.setAttribute('href','javascript:void(0);');
                objHoverNav.appendChild(objPrevLinkImg);
                Event.observe(objPrevLinkImg,'click',this.showPrev.bindAsEventListener(this));

                var objNextLinkImg = document.createElement('a');
                objNextLinkImg.setAttribute('id',this.getID('nextLinkImg'));
                objNextLinkImg.setAttribute('href','javascript:void(0);');
                objHoverNav.appendChild(objNextLinkImg);
                Event.observe(objNextLinkImg,'click',this.showNext.bindAsEventListener(this));

                var objLoading = document.createElement('div');
                objLoading.setAttribute('id',this.getID('loading'));
                objImageContainer.appendChild(objLoading);

                var objLoadingLink = document.createElement('a');
                objLoadingLink.setAttribute('id',this.getID('loadingLink'));
                objLoadingLink.setAttribute('href','javascript:void(0);');
                objLoadingLink.innerHTML = this.options.strings.loadingMsg;
                objLoading.appendChild(objLoadingLink);
                Event.observe(objLoadingLink,'click',this.end.bindAsEventListener(this));

                if(this.options.imageDataLocation != 'north'){
                        objLightbox.appendChild(objImageDataContainer);
                }

                if(this.options.initImage != ''){
                        this.start($(this.options.initImage));
                }
        },

        //
        //        updateImageList()
        //        Loops through specific tags within 'container' looking for
        // 'lightbox' references and applies onclick events to them.
        //
        updateImageList: function(){
                var el, els, rel;
                for(var i=0; i < this.refTags.length; i++){
                        els = this.container.getElementsByTagName(this.refTags[i]);
                        for(var j=0; j < els.length; j++){
                                el = els[j];
                                rel = String(el.getAttribute('rel'));
                                if (el.getAttribute('href') && (rel.toLowerCase().match(this.relAttribute))){
                                        el.onclick = function(){Lightbox.start(this); return false;}
                                }
                        }
                }
        },

        //
        //        start()
        //        Display overlay and lightbox. If image is part of a set, add siblings to imageArray.
        //
        start: function(imageLink) {

                this.hideBadObjects();

                // stretch overlay to fill page and fade in
                var pageSize = this.getPageSize();
                $(this.getID('overlay')).setStyle({height:pageSize.pageHeight+'px'});
                new Effect.Appear(this.getID('overlay'), { duration: this.overlayDuration, from: 0, to: this.overlayOpacity });

                this.imageArray = [];
                this.groupName = null;

                var rel = imageLink.getAttribute('rel');
                var imageTitle = '';

                // if image is NOT part of a group..
                if(rel == this.relAttribute){
                        // add single image to imageArray
                        imageTitle = imageLink.getAttribute('title') ? imageLink.getAttribute('title') : '';
                        this.imageArray.push({'link':imageLink.getAttribute('href'), 'title':imageTitle});
                        this.startImage = 0;
                } else {
                        // if image is part of a group..
                        var els = this.container.getElementsByTagName(imageLink.tagName);
                        // loop through anchors, find other images in group, and add them to imageArray
                        for (var i=0; i<els.length; i++){
                                var el = els[i];
                                if (el.getAttribute('href') && (el.getAttribute('rel') == rel)){
                                        imageTitle = el.getAttribute('title') ? el.getAttribute('title') : '';
                                        this.imageArray.push({'link':el.getAttribute('href'),'title':imageTitle});
                                        if(el == imageLink){
                                                this.startImage = this.imageArray.length-1;
                                        }
                                }
                        }
                        // get group name
                        this.groupName = rel.substring(this.relAttribute.length+1,rel.length-1);
                }

                // calculate top offset for the lightbox and display
                var pageScroll = this.getPageScroll();
                var lightboxTop = pageScroll.y + (pageSize.winHeight / 15);

                $(this.getID('lightbox')).setStyle({top:lightboxTop+'px'}).show();
                this.changeImage(this.startImage);
        },

        //
        //        changeImage()
        //        Hide most elements and preload image in preparation for resizing image container.
        //
        changeImage: function(imageNum){
                this.activeImage = imageNum;

                this.disableKeyboardNav();
                this.pauseSlideShow();

                // hide elements during transition
                $(this.getID('loading')).show();
                $(this.getID('lightboxImage')).hide();
                $(this.getID('hoverNav')).hide();
                $(this.getID('imageDataContainer')).hide();
                $(this.getID('numberDisplay')).hide();
                $(this.getID('detailsNav')).hide();

                var imgPreloader = new Image();

                // once image is preloaded, resize image container
                imgPreloader.onload=function(){
                        $(Lightbox.getID('lightboxImage')).src = imgPreloader.src;
                        Lightbox.resizeImageContainer(imgPreloader.width,imgPreloader.height);
                }
                imgPreloader.src = this.imageArray[this.activeImage].link;

                if(this.options.googleAnalytics){
                        urchinTracker(this.imageArray[this.activeImage].link);
                }
        },

        //
        //        resizeImageContainer()
        //
        resizeImageContainer: function(imgWidth,imgHeight) {
                // get current height and width
                var cDims = $(this.getID('outerImageContainer')).getDimensions();

                // scalars based on change from old to new
                var xScale = ((imgWidth  + (this.options.borderSize * 2)) / cDims.width) * 100;
                var yScale = ((imgHeight  + (this.options.borderSize * 2)) / cDims.height) * 100;

                // calculate size difference between new and old image, and resize if necessary
                var wDiff = (cDims.width - this.options.borderSize * 2) - imgWidth;
                var hDiff = (cDims.height - this.options.borderSize * 2) - imgHeight;

                if(!( hDiff == 0)){ new Effect.Scale(this.getID('outerImageContainer'), yScale, {scaleX: false, duration: this.resizeDuration, queue: 'front'}); }
                if(!( wDiff == 0)){ new Effect.Scale(this.getID('outerImageContainer'), xScale, {scaleY: false, delay: this.resizeDuration, duration: this.resizeDuration}); }

                // if new and old image are same size and no scaling transition is necessary,
                // do a quick pause to prevent image flicker.
                if((hDiff == 0) && (wDiff == 0)){
                        if(navigator.appVersion.indexOf('MSIE')!=-1){ this.pause(250); } else { this.pause(100);}
                }

                $(this.getID('prevLinkImg')).setStyle({height:imgHeight+'px'});
                $(this.getID('nextLinkImg')).setStyle({height:imgHeight+'px'});
                $(this.getID('imageDataContainer')).setStyle({width:(imgWidth+(this.options.borderSize * 2))+'px'});

                this.showImage();
        },

        //
        //        showImage()
        //        Display image and begin preloading neighbors.
        //
        showImage: function(){
                $(this.getID('loading')).hide();
                new Effect.Appear(this.getID('lightboxImage'), { duration: 0.5, queue: 'end', afterFinish: function(){        Lightbox.updateDetails(); } });
                this.preloadNeighborImages();
        },

        //
        //        updateDetails()
        //        Display caption, image number, and bottom nav.
        //
        updateDetails: function() {
                $(this.getID('caption')).show();
                $(this.getID('caption')).update(this.imageArray[this.activeImage].title);

                // if image is part of set display 'Image x of y'
                if(this.imageArray.length > 1){
                        var num_display = this.options.strings.numDisplayPrefix + ' ' + eval(this.activeImage + 1) + ' ' + this.options.strings.numDisplaySeparator + ' ' + this.imageArray.length;
                        if(this.options.showGroupName && this.groupName != ''){
                                num_display += ' '+this.options.strings.numDisplaySeparator+' '+this.groupName;
                        }
                        $(this.getID('numberDisplay')).update(num_display).show();
                        if(!this.enableSlideshow){
                                $(this.getID('slideShowControl')).hide();
                        }
                        $(this.getID('detailsNav')).show();
                }

                new Effect.Parallel(
                        [ new Effect.SlideDown( this.getID('imageDataContainer'), { sync: true }),
                          new Effect.Appear(this.getID('imageDataContainer'), { sync: true }) ],
                        { duration:.65, afterFinish: function() { Lightbox.updateNav();} }
                );
        },

        //
        //        updateNav()
        //        Display appropriate previous and next hover navigation.
        //
        updateNav: function() {
                if(this.imageArray.length > 1){
                        $(this.getID('hoverNav')).show();
                        if(this.enableSlideshow){
                                if(this.playSlides){
                                        this.startSlideShow();
                                } else {
                                        this.stopSlideShow();
                                }
                        }
                }
                this.enableKeyboardNav();
        },
        //


        //
        //        stopSlideShow()
        //        Stops the slide show
        //
        toggleSlideShow: function(){
                if(this.playSlides){
                        this.stopSlideShow();
                }else{
                        this.startSlideShow();
                }
        },

        //
        //        pauseSlideShow()
        //        Pauses the slide show (doesn't change the value of this.playSlides)
        //
        pauseSlideShow: function(){
                if(this.slideShowTimer){
                        this.slideShowTimer.stop();
                }
        },

        //
        //        showNext()
        //        Display the next image in a group
        //
        showNext : function(){
                if(this.imageArray.length > 1){
                        if(!this.options.loop && ((this.activeImage == this.imageArray.length - 1 && this.startImage == 0) || (this.activeImage+1 == this.startImage))){
                                return this.end();
                        }
                        if(this.activeImage == this.imageArray.length - 1){
                                this.changeImage(0);
                        }else{
                                this.changeImage(this.activeImage+1);
                        }
                }
        },

        //
        //        showPrev()
        //        Display the next image in a group
        //
        showPrev : function(){
                if(this.imageArray.length > 1){
                        if(this.activeImage == 0){
                                this.changeImage(this.imageArray.length - 1);
                        }else{
                                this.changeImage(this.activeImage-1);
                        }
                }
        },

        //
        //        showFirst()
        //        Display the first image in a group
        //
        showFirst : function(){
                if(this.imageArray.length > 1){
                        this.changeImage(0);
                }
        },

        //
        //        showFirst()
        //        Display the first image in a group
        //
        showLast : function(){
                if(this.imageArray.length > 1){
                        this.changeImage(this.imageArray.length - 1);
                }
        },

        //
        //        enableKeyboardNav()
        //
        enableKeyboardNav: function() {
                document.onkeydown = this.keyboardAction;
        },

        //
        //        disableKeyboardNav()
        //
        disableKeyboardNav: function() {
                document.onkeydown = '';
        },

        //
        //        keyboardAction()
        //
        keyboardAction: function(e) {
                if (e == null) { // ie
                        keycode = event.keyCode;
                } else { // mozilla
                        keycode = e.which;
                }

                key = String.fromCharCode(keycode).toLowerCase();

                if(key == 'x' || key == 'o' || key == 'c'){ // close lightbox
                        Lightbox.end();
                } else if(key == 'p' || key == '%'){ // display previous image
                        Lightbox.showPrev();
                } else if(key == 'n' || key =='\''){ // display next image
                        Lightbox.showNext();
                } else if(key == 'f'){ // display first image
                        Lightbox.showFirst();
                } else if(key == 'l'){ // display last image
                        Lightbox.showLast();
                } else if(key == 's'){ // toggle slideshow
                        if(Lightbox.imageArray.length > 0 && Lightbox.options.enableSlideshow){
                                Lightbox.toggleSlideShow();
                        }
                }
        },

        //
        //        preloadNeighborImages()
        //        Preload previous and next images.
        //
        preloadNeighborImages: function(){
                var nextImageID = this.imageArray.length - 1 == this.activeImage ? 0 : this.activeImage + 1;
                nextImage = new Image();
                nextImage.src = this.imageArray[nextImageID].link

                var prevImageID = this.activeImage == 0 ? this.imageArray.length - 1 : this.activeImage - 1;
                prevImage = new Image();
                prevImage.src = this.imageArray[prevImageID].link;
        },

        //
        //        end()
        //
        end: function() {
                this.disableKeyboardNav();
                this.pauseSlideShow();
                $(this.getID('lightbox')).hide();
                new Effect.Fade(this.getID('overlay'), { duration:this.overlayDuration });
                this.showBadObjects();
        },

        //
        //        showBadObjects()
        //
        showBadObjects: function (){
                var els;
                var tags = Lightbox.badObjects;
                for(var i=0; i<tags.length; i++){
                        els = document.getElementsByTagName(tags[i]);
                        for(var j=0; j<els.length; j++){
                                $(els[j]).setStyle({visibility:'visible'});
                        }
                }
        },

        //
        //        hideBadObjects()
        //
        hideBadObjects: function (){
                var els;
                var tags = Lightbox.badObjects;
                for(var i=0; i<tags.length; i++){
                        els = document.getElementsByTagName(tags[i]);
                        for(var j=0; j<els.length; j++){
                                $(els[j]).setStyle({visibility:'hidden'});
                        }
                }
        },

        //
        // pause(numberMillis)
        // Pauses code execution for specified time. Uses busy code, not good.
        // Code from http://www.faqts.com/knowledge_base/view.phtml/aid/1602
        //
        pause: function(numberMillis) {
                var now = new Date();
                var exitTime = now.getTime() + numberMillis;
                while(true){
                        now = new Date();
                        if (now.getTime() > exitTime)
                                return;
                }
        },

        //
        // getPageScroll()
        // Returns array with x,y page scroll values.
        // Core code from - quirksmode.org
        //
        getPageScroll: function(){
                var x,y;
                if (self.pageYOffset) {
                        x = self.pageXOffset;
                        y = self.pageYOffset;
                } else if (document.documentElement && document.documentElement.scrollTop){         // Explorer 6 Strict
                        x = document.documentElement.scrollLeft;
                        y = document.documentElement.scrollTop;
                } else if (document.body) {// all other Explorers
                        x = document.body.scrollLeft;
                        y = document.body.scrollTop;
                }
                return {x:x,y:y};
        },

        //
        // getPageSize()
        // Returns array with page width, height and window width, height
        // Core code from - quirksmode.org
        // Edit for Firefox by pHaez
        //
        getPageSize: function(){
                var scrollX,scrollY,windowX,windowY,pageX,pageY;
                if (window.innerHeight && window.scrollMaxY) {
                        scrollX = document.body.scrollWidth;
                        scrollY = window.innerHeight + window.scrollMaxY;
                } else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
                        scrollX = document.body.scrollWidth;
                        scrollY = document.body.scrollHeight;
                } else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
                        scrollX = document.body.offsetWidth;
                        scrollY = document.body.offsetHeight;
                }

                if (self.innerHeight) {        // all except Explorer
                        windowX = self.innerWidth;
                        windowY = self.innerHeight;
                } else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
                        windowX = document.documentElement.clientWidth;
                        windowY = document.documentElement.clientHeight;
                } else if (document.body) { // other Explorers
                        windowX = document.body.clientWidth;
                        windowY = document.body.clientHeight;
                }

                pageY = (scrollY < windowY) ? windowY : scrollY; // for small pages with total height less then height of the viewport
                pageX = (scrollX < windowX) ? windowX : scrollX; // for small pages with total width less then width of the viewport

                return {pageWidth:pageX,pageHeight:pageY,winWidth:windowX,winHeight:windowY};
        },

        //
        // getID()
        // Returns formatted Lightbox element ID
        //
        getID: function(id){
                return this.options.prefix+id;
        }
}

// -----------------------------------------------------------------------------------

Event.observe(window,'load',function(){ Lightbox.initialize(); });