// -----------------------------------------------------------------------------------
//
//	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:        'images/lightbox2/loading.gif',     
    fileBottomNavCloseImage: 'images/lightbox2/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';
        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) escapeKey=event.DOM_VK_ESCAPE; // mozilla
        else escapeKey = 27; // ie

        var key=String.fromCharCode(keycode).toLowerCase();
        
        if(key.match(/x|o|c/)||(keycode==escapeKey))this.end(); // close lightbox
		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();});