// -----------------------------------------------------------------------------------
//
//	Lightbox v2.04
//	by Lokesh Dhakar - http://www.lokeshdhakar.com
//
// Modified by Mixel Adm
//	Last Modification: 9/7/08
// 
//	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:        "http://ultraneo.com/LBimages/loading.gif",     
    fileBottomNavCloseImage: "http://ultraneo.com/LBimages/close.gif",
	 fileFullZoom: 'http://ultraneo.com/LBimages/full.gif',
	 fileNormalZoom: 'http://ultraneo.com/LBimages/normal.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)
    zoomed: false, //esta en zoom
    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 #.
	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('div',{id:'LBGnav'},[
                        Builder.node('a',{id:'prevLink', href: '#' }),
                        Builder.node('a',{id:'nextLink', href: '#' }),
                     ]),
                        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 })
                        		),
                        		Builder.node('a',{id:'bottomNavFull', href: '#' },
                            		Builder.node('img', { src: LightboxOptions.fileFullZoom })
                        		),
                        		Builder.node('a',{id:'bottomNavNormal', href: '#' },
                            		Builder.node('img', { src: LightboxOptions.fileNormalZoom })
                        		)  
                    		   ])
                			])
            			)
                    ]),
                    Builder.node('div',{id:'loading'}, 
                        Builder.node('a',{id:'loadingLink', href: '#' }, 
                            Builder.node('img', {src: LightboxOptions.fileLoadingImage})
                        )
                    )
                ])
            )

        ]));

		$('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));
		$('bottomNavFull').observe('click', (function(event) { event.stop(); this.changeImage(this.activeImage,true ); }).bindAsEventListener(this));
		$('bottomNavNormal').observe('click', (function(event) { event.stop(); this.changeImage(this.activeImage); }).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 LBGnav nextLink loading loadingLink ' + 
                'imageDataContainer imageData imageDetails caption numberDisplay bottomNav bottomNavClose bottomNavFull bottomNavNormal';   
            $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 aPS = this.getPageSize();
        $('overlay').setStyle({ width: aPS[0] + 'px', height: aPS[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 view = document.viewport; 
        var aPS = view.getScrollOffsets();
        var lbT = aPS[1] + (view.getHeight() / 10);
        var lbL = aPS[0];
        this.lightbox.setStyle({ top: lbT + 'px', left: lbL + 'px' }).show();  
        this.changeImage(imageNum);
    }, 

    //
    //  changeImage()
    //  Hide most elements and preload image in preparation for resizing image container.
    //
    changeImage: function(imageNum,full) {   
        
        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();
        this.bottomNavNormal.hide();
        this.bottomNavFull.hide();        
        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];
		  var width = imgPreloader.width;
		  var height = imgPreloader.height;
		  var lbIs = this.lightboxImage.style;
		  var bor = LightboxOptions.borderSize * 2; 
		  lbIs.width = lbIs.height = 'auto';
		  
		  if(!full)
			{				
				var pw = (document.viewport.getWidth() - bor)/ width;
				var ph = (document.viewport.getHeight() - bor) / height  ;					
				var p = (pw < ph)?pw:ph;				
				if(p < 1)
				{
					this.bottomNavFull.show();					
					width *=p;height*=p;
					lbIs.width = (width - bor) + 'px';
					lbIs.height=(height) + 'px';					
				}
			}
			else {this.bottomNavNormal.show();}
					
         this.resizeImageContainer(width, height);
        }).bind(this);
        imgPreloader.src = this.imageArray[this.activeImage][0];
    },

	//
	//CentrarContainer()
	//
    centrarContainer: function(h)
	{
	  var v = document.viewport;
	  var aPS = v.getScrollOffsets();
     var lbT = aPS[1] + (v.getHeight() / 2) - (h/2) - 10 ;     
	  new Effect.Move(this.lightbox,{x: aPS[0],y:lbT, duration: this.resizeDuration, mode:'absolute'}); 
	}, 
	
		
	//
    //  resizeImageContainer()
    //
	
    resizeImageContainer: function(imgWidth, imgHeight) {

        // get current width and height
        var outer = this.outerImageContainer;
        var bor = LightboxOptions.borderSize * 2;
        // get new width
        var wNew  = (imgWidth + bor);
        // scalars based on change from old to new
        var xScale = ( wNew  / outer.getWidth())  * 100;
        var yScale = ((imgHeight + bor ) / outer.getHeight()) * 100;

        // calculate size difference between new and old image, and resize if necessary
		  this.centrarContainer(imgHeight);
        if (yScale != 100) new Effect.Scale(outer, yScale, {scaleX: false, duration: this.resizeDuration, queue: 'front'}); 
        if (xScale != 100) new Effect.Scale(outer, 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 ((yScale == 100) && (xScale == 100)){
            timeout = 100;           
            if (Prototype.Browser.IE) timeout = 250;   
        }
        (function(){
            this.LBGnav.setStyle({ height: (imgHeight - 20 ) + 'px' });
            this.imageDataContainer.setStyle({ width: wNew  + '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();
        }
        var arrayPageSize = this.getPageSize();
	     this.overlay.setStyle({ height: arrayPageSize[1] + 'px' });
      	this.updateNav(); 
    },

    //
    //  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, body = document.body;
		
		if (window.innerHeight && window.scrollMaxY) {	
			xScroll = window.innerWidth + window.scrollMaxX;
			yScroll = window.innerHeight + window.scrollMaxY;
		} else if (body.scrollHeight > body.offsetHeight){ // all but Explorer Mac
			xScroll = body.scrollWidth;
			yScroll = body.scrollHeight;
		} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
			xScroll = body.offsetWidth;
			yScroll = body.offsetHeight;
		}
		
		var windowWidth, windowHeight, docE = document.documentElement;

		if (self.innerHeight) {	// all except Explorer
			if(docE.clientWidth){
				windowWidth = docE.clientWidth; 
			} else {
				windowWidth = self.innerWidth;
			}
			windowHeight = self.innerHeight;
		} else if (docE && docE.clientHeight) { // Explorer 6 Strict Mode
			windowWidth = docE.clientWidth;
			windowHeight = docE.clientHeight;
		} else if (body) { // other Explorers
			windowWidth = body.clientWidth;
			windowHeight = body.clientHeight;
		}	
		
		// for small pages with total height less then height of the viewport
		pageHeight = (yScroll < windowHeight)? windowHeight: yScroll;
		
		// for small pages with total width less then width of the viewport
		pageWidth = xScroll < windowWidth ? xScroll : windowWidth;

		return [pageWidth,pageHeight];
	}
}
	
//document.observe('dom:loaded', function(){ setTimeout('new Lightbox();',6000)});
Event.observe(window,'load',function() {new Lightbox();});