// -----------------------------------------------------------------------------------
//
//	Lightbox v2.02
//	by Lokesh Dhakar - http://www.huddletogether.com
//	3/31/06
//
//	For more information on this script, visit:
//	http://huddletogether.com/projects/lightbox2/
//
//	Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
//	
//	Credit also due to those who have helped, inspired, and made their code available to the public.
//	Including: Scott Upton(uptonic.com), Peter-Paul Koch(quirksmode.org), Thomas Fuchs(mir.aculo.us), and others.
//
//
// -----------------------------------------------------------------------------------
/*

 Table of Contents
 -----------------
 Configuration
 Global Variables

 Extending Built-in Objects
 - Object.extend(Element)
 - Array.prototype.removeDuplicates()
 - Array.prototype.empty()

 Lightbox Class Declaration
 - initialize()
 - start()
 - changeImage()
 - resizeImageContainer()
 - showImage()
 - updateDetails()
 - updateNav()
 - enableKeyboardNav()
 - disableKeyboardNav()
 - keyboardAction()
 - preloadNeighborImages()
 - end()

 Miscellaneous Functions
 - getPageScroll()
 - getPageSize()
 - getKey()
 - listenKey()
 - showSelectBoxes()
 - hideSelectBoxes()
 - pause()
 - initLightbox()

 Function Calls
 - addLoadEvent(initLightbox)

 */
// -----------------------------------------------------------------------------------

//
//	Configuration
//
var fileLoadingImage = "/layouts/alpha/images/loading.gif";
var fileBottomNavCloseImage = "/layouts/alpha/images/closelabel.gif";

var resizeSpeed = 7;	// controls the speed of the image resizing (1=slowest and 10=fastest)

var borderSize = 10;	//if you adjust the padding in the CSS, you will need to update this variable

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

//
//	Global Variables
//
var imageArray = new Array;
var activeImage;

if (resizeSpeed > 10)
{
    resizeSpeed = 10;
}
if (resizeSpeed < 1)
{
    resizeSpeed = 1;
}
resizeDuration = (11 - resizeSpeed) * 0.15;

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

//
//	Additional methods for Element added by SU, Couloir
//	- further additions by Lokesh Dhakar (huddletogether.com)
//
Object.extend(Element, {
    getWidth: function(element)
    {
        element = $(element);
        return element.offsetWidth;
    },
    setWidth: function(element, w)
    {
        element = $(element);
        element.style.width = w + "px";
    },
    setHeight: function(element, h)
    {
        element = $(element);
        element.style.height = h + "px";
    },
    setTop: function(element, t)
    {
        element = $(element);
        element.style.top = t + "px";
    },
    setSrc: function(element, src)
    {
        element = $(element);
        element.src = src;
    },
    setHref: function(element, href)
    {
        element = $(element);
        element.href = href;
    },
    setInnerHTML: function(element, content)
    {
        element = $(element);
        element.innerHTML = content;
    }
});

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

//
//	Extending built-in Array object
//	- array.removeDuplicates()
//	- array.empty()
//
Array.prototype.removeDuplicates = function ()
{
    for (i = 1; i < this.length; i++)
    {
        if (this[i][0] == this[i - 1][0])
        {
            this.splice(i, 1);
        }
    }
}

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

Array.prototype.empty = function ()
{
    for (i = 0; i <= this.length; i++)
    {
        this.shift();
    }
}

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

//
//	Lightbox Class Declaration
//	- initialize()
//	- start()
//	- changeImage()
//	- resizeImageContainer()
//	- showImage()
//	- updateDetails()
//	- updateNav()
//	- enableKeyboardNav()
//	- disableKeyboardNav()
//	- keyboardNavAction()
//	- preloadNeighborImages()
//	- end()
//
//	Structuring of code inspired by Scott Upton (http://www.uptonic.com/)
//
var Lightbox = Class.create();

Lightbox.prototype = {

    // initialize()
    // Constructor runs on completion of the DOM loading. Loops through anchor tags looking for
    // 'lightbox' references and applies onclick events to appropriate links. The 2nd section of
    // the function inserts html at the bottom of the page which is used to display the shadow
    // overlay and the image container.
    //
    initialize: function()
    {
        if (!document.getElementsByTagName)
        {
            return;
        }
        var anchors = document.getElementsByTagName('a');

        // loop through all anchor tags
        for (var i = 0; i < anchors.length; i++)
        {
            var anchor = anchors[i];

            var relAttribute = String(anchor.getAttribute('rel'));

            // use the string.match() method to catch 'lightbox' references in the rel attribute
            if (anchor.getAttribute('href') && (relAttribute.toLowerCase().match('lightbox')))
            {
                anchor.onclick = function ()
                {
                    myLightbox.start(this);
                    return false;
                }
            }
        }

        // The rest of this 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 style="" id="hoverNav">
        //					<a href="#" id="prevLink"></a>
        //					<a href="#" id="nextLink"></a>
        //				</div>
        //				<div id="loading">
        //					<a href="#" id="loadingLink">
        //						<img src="images/loading.gif">
        //					</a>
        //				</div>
        //			</div>
        //		</div>
        //		<div id="imageDataContainer">
        //			<div id="imageData">
        //				<div id="imageDetails">
        //					<span id="caption"></span>
        //					<span id="numberDisplay"></span>
        //				</div>
        //				<div id="bottomNav">
        //					<a href="#" id="bottomNavClose">
        //						<img src="images/close.gif">
        //					</a>
        //				</div>
        //			</div>
        //		</div>
        //	</div>


        var objBody = document.getElementsByTagName("body").item(0);

        var objOverlay = document.createElement("div");
        objOverlay.setAttribute('id', 'overlay');
        objOverlay.style.display = 'none';
        objOverlay.onclick = function()
        {
            myLightbox.end();
            return false;
        }
        objBody.appendChild(objOverlay);

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

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

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

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

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

        var objPrevLink = document.createElement("a");
        objPrevLink.setAttribute('id', 'prevLink');
        objPrevLink.setAttribute('href', '#');
        objHoverNav.appendChild(objPrevLink);

        var objNextLink = document.createElement("a");
        objNextLink.setAttribute('id', 'nextLink');
        objNextLink.setAttribute('href', '#');
        objHoverNav.appendChild(objNextLink);

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

        var objLoadingLink = document.createElement("a");
        objLoadingLink.setAttribute('id', 'loadingLink');
        objLoadingLink.setAttribute('href', '#');
        objLoadingLink.onclick = function()
        {
            myLightbox.end();
            return false;
        }
        objLoading.appendChild(objLoadingLink);

        var objLoadingImage = document.createElement("img");
        objLoadingImage.setAttribute('src', fileLoadingImage);
        objLoadingLink.appendChild(objLoadingImage);

        var objImageDataContainer = document.createElement("div");
        objImageDataContainer.setAttribute('id', 'imageDataContainer');
        objImageDataContainer.className = 'clearfix';
        objLightbox.appendChild(objImageDataContainer);

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

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

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

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

        var objBottomNav = document.createElement("div");
        objBottomNav.setAttribute('id', 'bottomNav');
        objImageData.appendChild(objBottomNav);

        var objBottomNavCloseLink = document.createElement("a");
        objBottomNavCloseLink.setAttribute('id', 'bottomNavClose');
        objBottomNavCloseLink.setAttribute('href', '#');
        objBottomNavCloseLink.onclick = function()
        {
            myLightbox.end();
            return false;
        }
        objBottomNav.appendChild(objBottomNavCloseLink);

        var objBottomNavCloseImage = document.createElement("img");
        objBottomNavCloseImage.setAttribute('src', fileBottomNavCloseImage);
        objBottomNavCloseLink.appendChild(objBottomNavCloseImage);
    },

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

        hideSelectBoxes();

        // stretch overlay to fill page and fade in
        var arrayPageSize = getPageSize();
        Element.setHeight('overlay', arrayPageSize[1]);
        new Effect.Appear('overlay', { duration: 0.2, from: 0.0, to: 0.8 });

        imageArray = [];
        imageNum = 0;

        if (!document.getElementsByTagName)
        {
            return;
        }
        var anchors = document.getElementsByTagName('a');

        // if image is NOT part of a set..
        if ((imageLink.getAttribute('rel') == 'lightbox'))
        {
            // add single image to imageArray
            imageArray.push(new Array(imageLink.getAttribute('href'), imageLink.getAttribute('title')));
        }
        else
        {
            // if image is part of a set..

            // loop through anchors, find other images in set, and add them to imageArray
            for (var i = 0; i < anchors.length; i++)
            {
                var anchor = anchors[i];
                if (anchor.getAttribute('href') && (anchor.getAttribute('rel') == imageLink.getAttribute('rel')))
                {
                    imageArray.push(new Array(anchor.getAttribute('href'), anchor.getAttribute('title')));
                }
            }
            imageArray.removeDuplicates();
            while (imageArray[imageNum][0] != imageLink.getAttribute('href'))
            {
                imageNum++;
            }
        }

        // calculate top offset for the lightbox and display
        var arrayPageSize = getPageSize();
        var arrayPageScroll = getPageScroll();
        var lightboxTop = arrayPageScroll[1] + (arrayPageSize[3] / 15);

        Element.setTop('lightbox', lightboxTop);
        Element.show('lightbox');

        this.changeImage(imageNum);
    },

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

        activeImage = imageNum;	// update global var

        // hide elements during transition
        Element.show('loading');
        Element.hide('lightboxImage');
        Element.hide('hoverNav');
        Element.hide('prevLink');
        Element.hide('nextLink');
        Element.hide('imageDataContainer');
        Element.hide('numberDisplay');

        imgPreloader = new Image();

        // once image is preloaded, resize image container
        imgPreloader.onload = function()
        {
            Element.setSrc('lightboxImage', imageArray[activeImage][0]);
            myLightbox.resizeImageContainer(imgPreloader.width, imgPreloader.height);
        }
        imgPreloader.src = imageArray[activeImage][0];
    },

    //
    //	resizeImageContainer()
    //
    resizeImageContainer: function(imgWidth, imgHeight)
    {

        // get current height and width
        this.wCur = Element.getWidth('outerImageContainer');
        this.hCur = Element.getHeight('outerImageContainer');

        // scalars based on change from old to new
        this.xScale = ((imgWidth + (borderSize * 2)) / this.wCur) * 100;
        this.yScale = ((imgHeight + (borderSize * 2)) / this.hCur) * 100;

        // calculate size difference between new and old image, and resize if necessary
        wDiff = (this.wCur - borderSize * 2) - imgWidth;
        hDiff = (this.hCur - borderSize * 2) - imgHeight;

        if (!( hDiff == 0))
        {
            new Effect.Scale('outerImageContainer', this.yScale, {scaleX: false, duration: resizeDuration, queue: 'front'});
        }
        if (!( wDiff == 0))
        {
            new Effect.Scale('outerImageContainer', this.xScale, {scaleY: false, delay: resizeDuration, duration: 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)
            {
                pause(250);
            }
            else
            {
                pause(100);
            }
        }

        Element.setHeight('prevLink', imgHeight);
        Element.setHeight('nextLink', imgHeight);
        Element.setWidth('imageDataContainer', imgWidth + (borderSize * 2));

        this.showImage();
    },

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

    //
    //	updateDetails()
    //	Display caption, image number, and bottom nav.
    //
    updateDetails: function()
    {

        Element.show('caption');
        Element.setInnerHTML('caption', imageArray[activeImage][1]);

        // if image is part of set display 'Image x of x'
        if (imageArray.length > 1)
        {
            Element.show('numberDisplay');
            Element.setInnerHTML('numberDisplay', "Demo " + eval(activeImage + 1) + " von " + imageArray.length);
        }

        new Effect.Parallel(
                [ new Effect.SlideDown('imageDataContainer', { sync: true, duration: resizeDuration + 0.25, from: 0.0, to: 1.0 }),
                    new Effect.Appear('imageDataContainer', { sync: true, duration: 1.0 }) ],
        { duration: 0.65, afterFinish: function()
        {
            myLightbox.updateNav();
        } }
                );
    },

    //
    //	updateNav()
    //	Display appropriate previous and next hover navigation.
    //
    updateNav: function()
    {

        Element.show('hoverNav');

        // if not first image in set, display prev image button
        if (activeImage != 0)
        {
            Element.show('prevLink');
            document.getElementById('prevLink').onclick = function()
            {
                myLightbox.changeImage(activeImage - 1);
                return false;
            }
        }

        // if not last image in set, display next image button
        if (activeImage != (imageArray.length - 1))
        {
            Element.show('nextLink');
            document.getElementById('nextLink').onclick = function()
            {
                myLightbox.changeImage(activeImage + 1);
                return false;
            }
        }

        this.enableKeyboardNav();
    },

    //
    //	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
            myLightbox.end();
        }
        else
        {
            if (key == 'p')
            {    // display previous image
                if (activeImage != 0)
                {
                    myLightbox.disableKeyboardNav();
                    myLightbox.changeImage(activeImage - 1);
                }
            }
            else
            {
                if (key == 'n')
                {    // display next image
                    if (activeImage != (imageArray.length - 1))
                    {
                        myLightbox.disableKeyboardNav();
                        myLightbox.changeImage(activeImage + 1);
                    }
                }
            }
        }


    },

    //
    //	preloadNeighborImages()
    //	Preload previous and next images.
    //
    preloadNeighborImages: function()
    {

        if ((imageArray.length - 1) > activeImage)
        {
            preloadNextImage = new Image();
            preloadNextImage.src = imageArray[activeImage + 1][0];
        }
        if (activeImage > 0)
        {
            preloadPrevImage = new Image();
            preloadPrevImage.src = imageArray[activeImage - 1][0];
        }

    },

    //
    //	end()
    //
    end: function()
    {
        this.disableKeyboardNav();
        Element.hide('lightbox');
        new Effect.Fade('overlay', { duration: 0.2});
        showSelectBoxes();
    }
}

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

//
// getPageScroll()
// Returns array with x,y page scroll values.
// Core code from - quirksmode.org
//
function getPageScroll()
{

    var yScroll;

    if (self.pageYOffset)
    {
        yScroll = self.pageYOffset;
    }
    else
    {
        if (document.documentElement && document.documentElement.scrollTop)
        {     // Explorer 6 Strict
            yScroll = document.documentElement.scrollTop;
        }
        else
        {
            if (document.body)
            {// all other Explorers
                yScroll = document.body.scrollTop;
            }
        }
    }

    arrayPageScroll = new Array('', yScroll)
    return arrayPageScroll;
}

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

//
// getPageSize()
// Returns array with page width, height and window width, height
// Core code from - quirksmode.org
// Edit for Firefox by pHaez
//
function getPageSize()
{

    var xScroll, yScroll;

    if (window.innerHeight && window.scrollMaxY)
    {
        xScroll = document.body.scrollWidth;
        yScroll = window.innerHeight + window.scrollMaxY;
    }
    else
    {
        if (document.body.scrollHeight > document.body.offsetHeight)
        { // all but Explorer Mac
            xScroll = document.body.scrollWidth;
            yScroll = document.body.scrollHeight;
        }
        else
        { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
            xScroll = document.body.offsetWidth;
            yScroll = document.body.offsetHeight;
        }
    }

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

    // for small pages with total height less then height of the viewport
    if (yScroll < windowHeight)
    {
        pageHeight = windowHeight;
    }
    else
    {
        pageHeight = yScroll;
    }

    // for small pages with total width less then width of the viewport
    if (xScroll < windowWidth)
    {
        pageWidth = windowWidth;
    }
    else
    {
        pageWidth = xScroll;
    }


    arrayPageSize = new Array(pageWidth, pageHeight, windowWidth, windowHeight)
    return arrayPageSize;
}

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

//
// getKey(key)
// Gets keycode. If 'x' is pressed then it hides the lightbox.
//
function getKey(e)
{
    if (e == null)
    { // ie
        keycode = event.keyCode;
    }
    else
    { // mozilla
        keycode = e.which;
    }
    key = String.fromCharCode(keycode).toLowerCase();

    if (key == 'x')
    {
    }
}

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

//
// listenKey()
//
function listenKey()
{
    document.onkeypress = getKey;
}

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

function showSelectBoxes()
{
    selects = document.getElementsByTagName("select");
    for (i = 0; i != selects.length; i++)
    {
        selects[i].style.visibility = "visible";
    }
}

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

function hideSelectBoxes()
{
    selects = document.getElementsByTagName("select");
    for (i = 0; i != selects.length; i++)
    {
        selects[i].style.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
//
function pause(numberMillis)
{
    var now = new Date();
    var exitTime = now.getTime() + numberMillis;
    while (true)
    {
        now = new Date();
        if (now.getTime() > exitTime)
        {
            return;
        }
    }
}

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


function initLightbox()
{
    myLightbox = new Lightbox();
}
Event.observe(window, 'load', initLightbox, false);