// -----------------------------------------------------------------------------------
//
//	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.
//
// -----------------------------------------------------------------------------------
//  Configurationl
//
LightboxOptions=Object.extend({
    fileLoadingImage:        'imagenes/lightboximgs/loading.gif',     
    fileBottomNavCloseImage: 'imagenes/lightboximgs/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: "Imagen",
	labelOf: "de"
}, 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;
        d.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=d.viewport.getScrollOffsets();
        var lightboxTop=arrayPageScroll[1]+(d.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(){
        d.observe('keydown', this.keyboardAction); 
    },

    //
    //  disableKeyboardNav()
    //
    disableKeyboardNav: function(){
        d.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)){ // close lightbox
            this.end();
        }else if((key == 'a') || (keycode == 37)){ // display previous image
            if(this.activeImage != 0){
                this.disableKeyboardNav();
                this.changeImage(this.activeImage-1);
            }
        }else if((key == 's') || (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(d.body.scrollHeight > d.body.offsetHeight){ // all but Explorer Mac
			xScroll=d.body.scrollWidth;
			yScroll=d.body.scrollHeight;
		} else{ // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
			xScroll=d.body.offsetWidth;
			yScroll=d.body.offsetHeight;
		}
		
		var windowWidth, windowHeight;
		
		if(self.innerHeight){	// all except Explorer
			if(d.documentElement.clientWidth) windowWidth=d.documentElement.clientWidth;
			else windowWidth=self.innerWidth;
			
			windowHeight=self.innerHeight;
		}else if(d.documentElement && d.documentElement.clientHeight) { // Explorer 6 Strict Mode
			windowWidth=d.documentElement.clientWidth;
			windowHeight=d.documentElement.clientHeight;
		}else if(d.body) { // other Explorers
			windowWidth=d.body.clientWidth;
			windowHeight=d.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];
	}
}

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