// -----------------------------------------------------------------------------------
//
// Lightbox v2.04
// by Lokesh Dhakar - http://www.lokeshdhakar.com
// Last Modification: 2/9/08
//
// For more information, visit:
// http://lokeshdhakar.com/projects/lightbox2/
//
// Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
// - Free for use in both personal and commercial projects
// - Attribution requires leaving author name, author link, and the license info intact.
// 
// Thanks: Scott Upton(uptonic.com), Peter-Paul Koch(quirksmode.com), and Thomas Fuchs(mir.aculo.us) for ideas, libs, and snippets.
// Artemy Tregubenko (arty.name) for cleanup and help in updating to latest ver of proto-aculous.
//
// -----------------------------------------------------------------------------------
LightboxOptions = Object.extend({
 fileLoadingImage: 'images/loading.gif', 
 fileBottomNavCloseImage: 'images/closelabel.gif',
 overlayOpacity: 0.8, // controls transparency of shadow overlay
 animate: true, // toggles resizing animations
 resizeSpeed: 7, // controls the speed of the image resizing animations (1=slowest and 10=fastest)
 borderSize: 10, //if you adjust the padding in the CSS, you will need to update this variable
 labelImage: "Obrazek",
 labelOf: "z"
}, window.LightboxOptions || {});
var Lightbox = Class.create();
Lightbox.prototype = {
 imageArray: [],
 activeImage: undefined,
 initialize: function() { 
 this.updateImageList();
 this.keyboardAction = this.keyboardAction.bindAsEventListener(this);
 if (LightboxOptions.resizeSpeed > 10) LightboxOptions.resizeSpeed = 10;
 if (LightboxOptions.resizeSpeed < 1) LightboxOptions.resizeSpeed = 1;
 this.resizeDuration = LightboxOptions.animate ? ((11 - LightboxOptions.resizeSpeed) * 0.15) : 0;
 this.overlayDuration = LightboxOptions.animate ? 0.2 : 0; // shadow fade in/out duration
 var size = (LightboxOptions.animate ? 250 : 1) + 'px';
 var objBody = $$('body')[0];
 objBody.appendChild(Builder.node('div',{id:'overlay'}));
 objBody.appendChild(Builder.node('div',{id:'lightbox'}, [
 Builder.node('div',{id:'outerImageContainer'}, 
 Builder.node('div',{id:'imageContainer'}, [
 Builder.node('img',{id:'lightboxImage'}), 
 Builder.node('div',{id:'hoverNav'}, [
 Builder.node('a',{id:'prevLink', href: '#' }),
 Builder.node('a',{id:'nextLink', href: '#' })]),
 Builder.node('div',{id:'loading'}, 
 Builder.node('a',{id:'loadingLink', href: '#' }, 
 Builder.node('img', {src: LightboxOptions.fileLoadingImage})))])),
 Builder.node('div', {id:'imageDataContainer'},
 Builder.node('div',{id:'imageData'}, [
 Builder.node('div',{id:'imageDetails'}, [
 Builder.node('span',{id:'caption'}),
 Builder.node('span',{id:'numberDisplay'})]),
 Builder.node('div',{id:'bottomNav'},
 Builder.node('a',{id:'bottomNavClose', href: '#' },
 Builder.node('img', { src: LightboxOptions.fileBottomNavCloseImage })
 ))]))]));
 $('overlay').hide().observe('click', (function() { this.end(); }).bind(this));
 $('lightbox').hide().observe('click', (function(event) { if (event.element().id == 'lightbox') this.end(); }).bind(this));
 $('outerImageContainer').setStyle({ width: size, height: size });
 $('prevLink').observe('click', (function(event) { event.stop(); this.changeImage(this.activeImage - 1); }).bindAsEventListener(this));
 $('nextLink').observe('click', (function(event) { event.stop(); this.changeImage(this.activeImage + 1); }).bindAsEventListener(this));
 $('loadingLink').observe('click', (function(event) { event.stop(); this.end(); }).bind(this));
 $('bottomNavClose').observe('click', (function(event) { event.stop(); this.end(); }).bind(this));
 var th = this;
 (function(){
 var ids = 
 'overlay lightbox outerImageContainer imageContainer lightboxImage hoverNav prevLink nextLink loading loadingLink ' + 
 'imageDataContainer imageData imageDetails caption numberDisplay bottomNav bottomNavClose'; 
 $w(ids).each(function(id){ th[id] = $(id); });
 }).defer(); },
 updateImageList: function() { 
 this.updateImageList = Prototype.emptyFunction;
 document.observe('click', (function(event){
 var target = event.findElement('a[rel^=lightbox]') || event.findElement('area[rel^=lightbox]');
 if (target) {
 event.stop();
 this.start(target);
 } }).bind(this)); },
 start: function(imageLink) { 
 $$('select', 'object', 'embed').each(function(node){ node.style.visibility = 'hidden' });
 var arrayPageSize = this.getPageSize();
 $('overlay').setStyle({ width: arrayPageSize[0] + 'px', height: arrayPageSize[1] + 'px' });
 new Effect.Appear(this.overlay, { duration: this.overlayDuration, from: 0.0, to: LightboxOptions.overlayOpacity });
 this.imageArray = [];
 var imageNum = 0; 
 if ((imageLink.rel == 'lightbox')){
 this.imageArray.push([imageLink.href, imageLink.title]); 
 } else {
 this.imageArray = 
 $$(imageLink.tagName + '[href][rel="' + imageLink.rel + '"]').
 collect(function(anchor){ return [anchor.href, anchor.title]; }).
 uniq();
 while (this.imageArray[imageNum][0] != imageLink.href) { imageNum++; } }
 var arrayPageScroll = document.viewport.getScrollOffsets();
 var lightboxTop = arrayPageScroll[1] + (document.viewport.getHeight() / 10);
 var lightboxLeft = arrayPageScroll[0];
 this.lightbox.setStyle({ top: lightboxTop + 'px', left: lightboxLeft + 'px' }).show();
 this.changeImage(imageNum);
 },
 changeImage: function(imageNum) { 
 this.activeImage = imageNum;
 if (LightboxOptions.animate) this.loading.show();
 this.lightboxImage.hide();
 this.hoverNav.hide();
 this.prevLink.hide();
 this.nextLink.hide();
 this.imageDataContainer.setStyle({opacity: .0001});
 this.numberDisplay.hide(); 
 var imgPreloader = new Image();
 imgPreloader.onload = (function(){
 this.lightboxImage.src = this.imageArray[this.activeImage][0];
 this.resizeImageContainer(imgPreloader.width, imgPreloader.height);
 }).bind(this);
 imgPreloader.src = this.imageArray[this.activeImage][0];
 },
 resizeImageContainer: function(imgWidth, imgHeight) {
 var widthCurrent = this.outerImageContainer.getWidth();
 var heightCurrent = this.outerImageContainer.getHeight();
 var widthNew = (imgWidth + LightboxOptions.borderSize * 2);
 var heightNew = (imgHeight + LightboxOptions.borderSize * 2);
 var xScale = (widthNew / widthCurrent) * 100;
 var yScale = (heightNew / heightCurrent) * 100;
 var wDiff = widthCurrent - widthNew;
 var hDiff = heightCurrent - heightNew;
 if (hDiff != 0) new Effect.Scale(this.outerImageContainer, yScale, {scaleX: false, duration: this.resizeDuration, queue: 'front'}); 
 if (wDiff != 0) new Effect.Scale(this.outerImageContainer, xScale, {scaleY: false, duration: this.resizeDuration, delay: this.resizeDuration}); 
 var timeout = 0;
 if ((hDiff == 0) && (wDiff == 0)){
 timeout = 100;
 if (Prototype.Browser.IE) timeout = 250; 
 }
 (function(){
 this.prevLink.setStyle({ height: imgHeight + 'px' });
 this.nextLink.setStyle({ height: imgHeight + 'px' });
 this.imageDataContainer.setStyle({ width: widthNew + 'px' });
 this.showImage();
 }).bind(this).delay(timeout / 1000); },
 showImage: function(){
 this.loading.hide();
 new Effect.Appear(this.lightboxImage, { 
 duration: this.resizeDuration, 
 queue: 'end', 
 afterFinish: (function(){ this.updateDetails(); }).bind(this) 
 });
 this.preloadNeighborImages();
 },
 updateDetails: function() {
 if (this.imageArray[this.activeImage][1] != ""){
 this.caption.update(this.imageArray[this.activeImage][1]).show(); }
 if (this.imageArray.length > 1){
 this.numberDisplay.update( LightboxOptions.labelImage + ' ' + (this.activeImage + 1) + ' ' + LightboxOptions.labelOf + ' ' + this.imageArray.length).show();}
 new Effect.Parallel(
 [ 
 new Effect.SlideDown(this.imageDataContainer, { sync: true, duration: this.resizeDuration, from: 0.0, to: 1.0 }), 
 new Effect.Appear(this.imageDataContainer, { sync: true, duration: this.resizeDuration }) 
 ], 
 { 
 duration: this.resizeDuration, 
 afterFinish: (function() {
 var arrayPageSize = this.getPageSize();
 this.overlay.setStyle({ height: arrayPageSize[1] + 'px' });
 this.updateNav();
 }).bind(this)
 });},
 updateNav: function() {
 this.hoverNav.show(); 
 if (this.activeImage > 0) this.prevLink.show();
 if (this.activeImage < (this.imageArray.length - 1)) this.nextLink.show();
 this.enableKeyboardNav();
 },
 enableKeyboardNav: function() {
 document.observe('keydown', this.keyboardAction); 
 },
 disableKeyboardNav: function() {
 document.stopObserving('keydown', this.keyboardAction); 
 },
 keyboardAction: function(event) {
 var keycode = event.keyCode;
 var escapeKey;
 if (event.DOM_VK_ESCAPE) { // mozilla
 escapeKey = event.DOM_VK_ESCAPE;
 } else {
 escapeKey = 27; }
 var key = String.fromCharCode(keycode).toLowerCase();
 if (key.match(/x|o|c/) || (keycode == escapeKey)){ // close lightbox
 this.end();
 } else if ((key == 'p') || (keycode == 37)){ // display previous image
 if (this.activeImage != 0){
 this.disableKeyboardNav();
 this.changeImage(this.activeImage - 1);
 }
 } else if ((key == 'n') || (keycode == 39)){ // display next image
 if (this.activeImage != (this.imageArray.length - 1)){
 this.disableKeyboardNav();
 this.changeImage(this.activeImage + 1);
 }}},
 preloadNeighborImages: function(){
 var preloadNextImage, preloadPrevImage;
 if (this.imageArray.length > this.activeImage + 1){
 preloadNextImage = new Image();
 preloadNextImage.src = this.imageArray[this.activeImage + 1][0];
 }
 if (this.activeImage > 0){
 preloadPrevImage = new Image();
 preloadPrevImage.src = this.imageArray[this.activeImage - 1][0];
 }},
 end: function() {
 this.disableKeyboardNav();
 this.lightbox.hide();
 new Effect.Fade(this.overlay, { duration: this.overlayDuration });
 $$('select', 'object', 'embed').each(function(node){ node.style.visibility = 'visible' });
 },
 getPageSize: function() {
 var xScroll, yScroll;
 if (window.innerHeight && window.scrollMaxY) { 
 xScroll = window.innerWidth + window.scrollMaxX;
 yScroll = window.innerHeight + window.scrollMaxY;
 } else if (document.body.scrollHeight > document.body.offsetHeight){
 xScroll = document.body.scrollWidth;
 yScroll = document.body.scrollHeight;
 } else {
 xScroll = document.body.offsetWidth;
 yScroll = document.body.offsetHeight;
 }
 var windowWidth, windowHeight;
 if (self.innerHeight) {
 if(document.documentElement.clientWidth){
 windowWidth = document.documentElement.clientWidth; 
 } else {
 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) {
 windowWidth = document.body.clientWidth;
 windowHeight = document.body.clientHeight; } 
 if(yScroll < windowHeight){
 pageHeight = windowHeight;
 } else { 
 pageHeight = yScroll;
 }
 if(xScroll < windowWidth){ 
 pageWidth = xScroll; 
 } else {
 pageWidth = windowWidth;
 }
 return [pageWidth,pageHeight];
 }}
document.observe('dom:loaded', function () { new Lightbox(); });