// -----------------------------------------------------------------------------------
//
//        Lightbox v2.01
//        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 = "img/gallery/objects/loading.gif";
var fileBottomNavCloseImage = "img/gallery/objects/closelabel.gif";

var resizeSpeed = 5;        // 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', "Bild " + 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);