// -----------------------------------------------------------------------------------
//
//      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:               'smarty/images/loading.gif',    
        fileBottomNavCloseImage: 'smarty/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

        // 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); });
if (document.getElementById('first')) {
th.start(document.getElementById('first'));
}
}).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(/L/) || (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(); });