// -----------------------------------------------------------------------------------
    //
//    	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.
    //
    // -----------------------------------------------------------------------------------
    /*

        Table of Contents
        -----------------
        Configuration

        Lightbox Class Declaration
        - initialize()
        - updateImageList()
        - start()
        - changeImage()
        - resizeImageContainer()
        - showImage()
        - updateDetails()
        - updateNav()
        - enableKeyboardNav()
        - disableKeyboardNav()
        - keyboardAction()
        - preloadNeighborImages()
        - end()
        
        Function Calls
        - document.observe()
       
    */
    // -----------------------------------------------------------------------------------

    //
    //  Configurationl
    //
    LightboxOptions = Object.extend({
        fileLoadingImage:        default_lightbox_url+'loading.gif',
        fileBottomNavCloseImage: default_lightbox_url+'close.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

    	// When grouping images this is used to write: Image # of #.
    	// Change it for non-english localization
    	labelImage: "Image",
    	labelOf: "of"
    }, window.LightboxOptions || {});

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

    var Lightbox = Class.create();

    Lightbox.prototype = {
        imageArray: [],
        activeImage: undefined,
        
        // initialize()
        // Constructor runs on completion of the DOM loading. Calls updateImageList and then
        // the function inserts html at the bottom of the page which is used to display the shadow 
        // overlay and the image container.
        //
        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

            // When Lightbox starts it will resize itself from 250 by 250 to the current image dimension.
            // If animations are turned off, it will be hidden as to prevent a flicker of a
            // white 250 by 250 box.
            var size = (LightboxOptions.animate ? 250 : 1) + 'px';
            

            // 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 = $$('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()
        // Loops through anchor tags looking for 'lightbox' references and applies onclick
        // events to appropriate links. You can rerun after dynamically adding images w/ajax.
        //
        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()
        //  Display overlay and lightbox. If image is part of a set, add siblings to imageArray.
        //
        start: function(imageLink) {    

            $$('select', 'object', 'embed').each(function(node){ node.style.visibility = 'hidden' });

            // stretch overlay to fill page and fade in
            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')){
                // if image is NOT part of a set, add single image to imageArray
                this.imageArray.push([imageLink.href, imageLink.title]);         
            } else {
                // if image is part of a set..
                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++; }
            }

            // calculate top and left offset for the lightbox 
            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()
        //  Hide most elements and preload image in preparation for resizing image container.
        //
        changeImage: function(imageNum) {   
            
            this.activeImage = imageNum; // update global var

            // hide elements during transition
            if (LightboxOptions.animate) this.loading.show();
            this.lightboxImage.hide();
            this.hoverNav.hide();
            this.prevLink.hide();
            this.nextLink.hide();
    		// HACK: Opera9 does not currently support scriptaculous opacity and appear fx
            this.imageDataContainer.setStyle({opacity: .0001});
            this.numberDisplay.hide();      
            
            var imgPreloader = new Image();
            
            // once image is preloaded, resize image container


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

            // get current width and height
            var widthCurrent  = this.outerImageContainer.getWidth();
            var heightCurrent = this.outerImageContainer.getHeight();

            // get new width and height
            var widthNew  = (imgWidth  + LightboxOptions.borderSize * 2);
            var heightNew = (imgHeight + LightboxOptions.borderSize * 2);

            // scalars based on change from old to new
            var xScale = (widthNew  / widthCurrent)  * 100;
            var yScale = (heightNew / heightCurrent) * 100;

            // calculate size difference between new and old image, and resize if necessary
            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}); 

            // if new and old image are same size and no scaling transition is necessary, 
            // do a quick pause to prevent image flicker.
            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()
        //  Display image and begin preloading neighbors.
        //
        showImage: function(){
            this.loading.hide();
            new Effect.Appear(this.lightboxImage, { 
                duration: this.resizeDuration, 
                queue: 'end', 
                afterFinish: (function(){ this.updateDetails(); }).bind(this) 
            });
            this.preloadNeighborImages();
        },

        //
        //  updateDetails()
        //  Display caption, image number, and bottom nav.
        //
        updateDetails: function() {
        
            // if caption is not null
            if (this.imageArray[this.activeImage][1] != ""){
                this.caption.update(this.imageArray[this.activeImage][1]).show();
            }
            
            // if image is part of set display 'Image x of x' 
            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() {
    	                // update overlay size and update nav
    	                var arrayPageSize = this.getPageSize();
    	                this.overlay.setStyle({ height: arrayPageSize[1] + 'px' });
    	                this.updateNav();
                    }).bind(this)
                } 
            );
        },

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

            this.hoverNav.show();               

            // if not first image in set, display prev image button
            if (this.activeImage > 0) this.prevLink.show();

            // if not last image in set, display next image button
            if (this.activeImage < (this.imageArray.length - 1)) this.nextLink.show();
            
            this.enableKeyboardNav();
        },

        //
        //  enableKeyboardNav()
        //
        enableKeyboardNav: function() {
            document.observe('keydown', this.keyboardAction); 
        },

        //
        //  disableKeyboardNav()
        //
        disableKeyboardNav: function() {
            document.stopObserving('keydown', this.keyboardAction); 
        },

        //
        //  keyboardAction()
        //
        keyboardAction: function(event) {
            var keycode = event.keyCode;

            var escapeKey;
            if (event.DOM_VK_ESCAPE) {  // mozilla
                escapeKey = event.DOM_VK_ESCAPE;
            } else { // ie
                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()
        //  Preload previous and next images.
        //
        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()
        //
        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()
        //
        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){ // 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
    			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) { // 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 = xScroll;		
    		} else {
    			pageWidth = windowWidth;
    		}

    		return [pageWidth,pageHeight];
    	}
    }

    document.observe('dom:loaded', function () { new Lightbox(); });