// -----------------------------------------------------------------------------------
//
//	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:        webRoot+'images/loading.gif',     
    fileBottomNavCloseImage: 'images/closelabel.gif',
    nextLinkImage: 'images/arrow.gif',
    prevLinkImage: 'images/arrow_left.gif',
	navLink: false,

    overlayOpacity: 0.75,   // controls transparency of shadow overlay

    animate: false,         // toggles resizing animations
    resizeSpeed: 10,        // 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",
	title: "",
	flowCount: 0,
	dimension_x: 375,
	dimension_y: 250
}, window.LightboxOptions || {});

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

var Lightbox = Class.create();

Lightbox.prototype = {
    imageArray: [],
    activeImage: 0,
    
    // 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:'imageDataContainer'}, [
            		Builder.node('div', {id:'coverlayTitle'}),
            		Builder.node('div', {id:'hoverNav'},[  
                        Builder.node('a',{id:'prevLink' },
                            Builder.node('img', { src: LightboxOptions.prevLinkImage })
                        ),
                        Builder.node('span',{id:'numberDisplay'}),
                        Builder.node('a',{id:'nextLink' },
                            Builder.node('img', { src: LightboxOptions.nextLinkImage })
	              		)
            		])
               	]),            	 
                Builder.node('div',{id:'imageContainer'}, [
                    Builder.node('div',{id:'lightboxImage'}), 
                    
                    Builder.node('div',{id:'loading'}, 
                        Builder.node('a',{id:'loadingLink', href: '#' }, 
                            Builder.node('img', {src: LightboxOptions.fileLoadingImage})
                        )
                    )
                ])
            ])            
        ]));


		$('overlay').hide();
		$('hoverNav').hide();
		//$('overlay').observe('click', (function() { this.end(); }).bind(this));
		$('lightbox').hide();
		//$('lightbox').observe('click', (function(event) { if (event.element().id == 'lightbox') this.end(); }).bind(this));
		$('outerImageContainer').setStyle({ width: size, height: size, fontSize:'12px' });
		$('prevLink').observe('click', (function(event) { event.stop(); this.showBox(this.imageArray[this.activeImage - 1][0], (this.activeImage - 1), this.imageArray[this.activeImage - 1][1], this.imageArray[this.activeImage - 1][2],this.imageArray[this.activeImage - 1][3]);LightboxOptions.navLink = true; }).bindAsEventListener(this));
        $('nextLink').observe('click', (function(event) { event.stop(); this.showBox(this.imageArray[this.activeImage + 1][0], (this.activeImage + 1), this.imageArray[this.activeImage + 1][1], this.imageArray[this.activeImage + 1][2],this.imageArray[this.activeImage + 1][3]);LightboxOptions.navLink = true; }).bindAsEventListener(this));
		
		$('loadingLink').observe('click', (function(event) { event.stop(); this.end(); }).bind(this));		
		
        var th = this;
        (function(){
            var ids = 
                'overlay lightbox outerImageContainer numberDisplay imageContainer lightboxImage hoverNav prevLink nextLink loading loadingLink imageDataContainer coverlayTitle';        
            $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, title, dimension, args) {
    	$$('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;   
        this.activeImage = 0;       

        // if image is NOT part of a set, add single image to imageArray
	      
        // calculate top and left offset for the lightbox 
        var arrayPageScroll = document.viewport.getScrollOffsets();
        
        if(dimension[1]>=(window.screen.availHeight-225)){
        	var lightboxTop = arrayPageScroll[1]+20;
        }else{
        	var lightboxTop = arrayPageScroll[1] + (arrayPageSize[0] / 9);
        }
        if(Prototype.Browser.IE){
        	var lightboxTop = arrayPageScroll[1] + 150;
        }
        var lightboxLeft = arrayPageScroll[0];
        this.lightbox.setStyle({ top: lightboxTop + 'px', left: lightboxLeft + 'px' }).show();
        this.showBox(imageLink, imageNum, title, dimension, args);
    },

    //
    //  changeImage()
    //  Hide most elements and preload image in preparation for resizing image container.
    //
    showBox: function(imageLink, imageNum, title, dimension, args) {
       this.hoverNav.hide();
       this.imageArray[imageNum] = [imageLink, title, dimension, args]; 
    	/*if(!LightboxOptions.navLink && this.activeImage<LightboxOptions.flowCount){
			data = this.imageArray.pop();
			this.imageArray[this.activeImage] = data;
    	}else{
    		LightboxOptions.navLink = false;
    	}*/
       this.activeImage = imageNum; // update global var
      /* if(this.imageArray[imageNum][1]){
        	title = this.imageArray[imageNum][1];
        }
         if(this.imageArray[imageNum][2]){
        	dimension = this.imageArray[imageNum][2];
        }
          if(this.imageArray[imageNum][3]){
        	args = this.imageArray[imageNum][3];
        }*/
		if(dimension.length > 0){
			LightboxOptions.dimension_x = eval(dimension[0]);
			LightboxOptions.dimension_y = eval(dimension[1]);
		}
		//alert(LightboxOptions.dimension_x+ ' '+LightboxOptions.dimension_y);
		LightboxOptions.title = title;
        // hide elements during transition
        this.lightboxImage.innerHTML = '<div id="loading"><a href="#" id="loadingLink"><img src="images/loading.gif"></a></div>';
                     
		// HACK: Opera9 does not currently support scriptaculous opacity and appear fx
       
        var pars = "";
       		for(i = 0; i<args.length;i++){
       			if(i==0)
					pars += args[i];
				else{
					pars += '&'+args[i];
				} 
       		}
            new Ajax.Updater(this.lightboxImage, this.imageArray[this.activeImage][0], {method: 'post', parameters: pars, evalScripts: true,onUninitialized:this.loading.show(), onComplete:[lightBox.resizeImageContainer(LightboxOptions.dimension_x, LightboxOptions.dimension_y),this.nextLink.hide(),this.prevLink.hide()], insertion: Insertion.Replace});
            if (LightboxOptions.animate) 
            	this.loading.show();
        	this.lightboxImage.hide();   
      },

    //
    //  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}); 
		this.outerImageContainer.setStyle({ width: widthNew, height: heightNew, fontSize:'12px' });
        // 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.showImage();
	   }).bind(this).delay(0);
    },
    
    //
    //  showImage()
    //  Display image and begin preloading neighbors.
    //
    showImage: function(){    	
        this.loading.hide();
        new Effect.Appear(this.lightboxImage, { 
            duration: this.resizeDuration, 
            afterFinish: (function(){ this.updateDetails(); }).bind(this) 
        });
        //this.preloadNeighborImages();
    },

    //
    //  updateDetails()
    //  Display caption, image number, and bottom nav.
    //
    updateDetails: function() {
    	if(LightboxOptions.flowCount > 1){
    		this.hoverNav.show();
    		if((this.activeImage+1)>=this.imageArray.length){
    			this.nextLink.hide();
    		}else{
    			this.nextLink.show();
    		}
    		if(this.activeImage == 0){
    			this.prevLink.hide();
    		}else{
    			this.prevLink.show();
    		}
    		//this.numberDisplay.update( (this.activeImage + 1) + ' ' + LightboxOptions.labelOf + '  ' + LightboxOptions.flowCount).show();
    	}
        // if caption is not null
		this.coverlayTitle.update( LightboxOptions.title).show();
        new Effect.Parallel(
            [ ], 
            { 
                duration: this.resizeDuration, 
                afterFinish: (function() {
	                // update overlay size and update nav
	                var arrayPageSize = this.getPageSize();
	                this.overlay.setStyle({ height: arrayPageSize[1] + 'px' });
	                this.enableKeyboardNav();
                }).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();
        
        
    },

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

    //
    //  disableKeyboardNav()
    //
    disableKeyboardNav: function() {
        document.stopObserving('keydown', this.keyboardAction); 
    },
    
    disableOverlayClick: function() {
       $('overlay').stopObserving('click', (function() { this.end(); }));
    },

    //
    //  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 ((keycode == escapeKey)){ // close lightbox
            this.end();
        } else if ((key == 'p') || (keycode == 37)){ // display previous image
            if (this.activeImage != 0){
                this.disableKeyboardNav();                
            }
        }
    },

    //
    //  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+20;
			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];
	}
}