/*
	Lightbox JS: Fullsize Image Overlays
	by Lokesh Dhakar - http://www.huddletogether.com

	For more information on this script, visit:
	http://huddletogether.com/projects/lightbox/

	Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
	(basically, do anything you want, just leave my name and link)

	Table of Contents
	-----------------
	Configuration

	Functions
	- getPageScroll()
	- getPageSize()
	- pause()
	- getKey()
	- listenKey()
	- showLightbox()
	- hideLightbox()
	- initLightbox()
	- addLoadEvent()
	
	Function Calls
	- addLoadEvent(initLightbox)

*/



//
// Configuration
//

// If you would like to use a custom loading image or close button reference them in the next two lines.
var loadingImage = '../images_web/loading.gif';
var closeButton = '../images_web/close.gif';





//
// getPageScroll()
// Returns array with x,y page scroll values.
// Core code from - quirksmode.org
//
function getPageScroll(){

	var yScroll;

	if (self.pageYOffset) {
		yScroll = self.pageYOffset;
	} else if (document.documentElement && document.documentElement.scrollTop){	 // Explorer 6 Strict
		yScroll = document.documentElement.scrollTop;
	} else if (document.body) {// all other Explorers
		yScroll = document.body.scrollTop;
	}

	arrayPageScroll = new Array('',yScroll)
	return arrayPageScroll;
}



//
// getPageSize()
// Returns array with page width, height and window width, height
// Core code from - quirksmode.org
// Edit for Firefox by pHaez
//
function getPageSize(){

	var xScroll, yScroll;

	if (window.innerHeight && window.scrollMaxY) {
		xScroll = document.body.scrollWidth;
		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
		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 = windowWidth;
	} else {
		pageWidth = xScroll;
	}


	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight)
	return arrayPageSize;
}


//
// pause(numberMillis)
// Pauses code execution for specified time. Uses busy code, not good.
// Code from http://www.faqts.com/knowledge_base/view.phtml/aid/1602
//
function pause(numberMillis) {
	var now = new Date();
	var exitTime = now.getTime() + numberMillis;
	while (true) {
		now = new Date();
		if (now.getTime() > exitTime)
			return;
	}
}

//
// getKey(key)
// Gets keycode. If 'x' is pressed then it hides the lightbox.
//

function getKey(e){
	if (e == null) { // ie
		keycode = event.keyCode;
	} else { // mozilla
		keycode = e.which;
	}
	key = String.fromCharCode(keycode).toLowerCase();

	if(key == 'x'){ hideLightbox(); }
}


//
// listenKey()
//
function listenKey () {	document.onkeypress = getKey; }

function getTotImages(imgSrc) {
	return document.getElementById("totImages_"+getNumGallery(imgSrc)).innerHTML;
}

function getNumGallery(imgSrc) {
    var imgSrcEnd=(imgSrc).substring((imgSrc).indexOf("imgg"));
    var numImgActual=imgSrcEnd.substring(5);
    numGalleryActual=numImgActual.substring(0,numImgActual.indexOf('_'));
	return document.getElementById("numGallery_"+numGalleryActual).innerHTML;
}

function getNumImgActual(imgSrc) {
    var newHrefBegin=(imgSrc).substring(0,(imgSrc).indexOf("imgg"));
    var newHrefEnd=(imgSrc).substring((imgSrc).indexOf("imgg"));
    var numImgActual=newHrefEnd.substring(5);
    numImgActual=numImgActual.substring(numImgActual.indexOf('_')+1,numImgActual.indexOf('.jpg'));
    return numImgActual;
}

//
// showLightbox()
// Preloads images. Pleaces new image in lightbox then centers and displays.
//

function showLightbox(objLink) {
    ///////////////////////////////////////////////////////////////////////////
    numImgActual=getNumImgActual(objLink.href);
    if(getTotImages(objLink.href)=="1")
		document.getElementById('keyboardMsg').style.display="none";
    else {
    	switch(numImgActual) {
	    	 case "1" :	changeArrowState('prevImg',false);
     					changeArrowState('nextImg',true);
	    	 break;
		     case getTotImages(objLink.href) :	changeArrowState('prevImg',true);
			     							   	changeArrowState('nextImg',false);
	    	 break;
    	}
    }
	// prep objects
	var objOverlay = document.getElementById('overlay');
	var objLightbox = document.getElementById('lightbox');
	var objCaption = document.getElementById('lightboxCaption');
	var objImage = document.getElementById('lightboxImage');
	var objLoadingImage = document.getElementById('loadingImage');
	var objLightboxDetails = document.getElementById('lightboxDetails');


	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();

	// center loadingImage if it exists
	if (objLoadingImage) {
		objLoadingImage.style.top = (arrayPageScroll[1] + ((arrayPageSize[3] - 35 - objLoadingImage.height) / 2) + 'px');
		objLoadingImage.style.left = (((arrayPageSize[0] - 20 - objLoadingImage.width) / 2) + 'px');
		objLoadingImage.style.display = 'block';
	}

	// set height of Overlay to take up whole page and show
	objOverlay.style.height = (arrayPageSize[1] + 'px');
	objOverlay.style.display = 'block';

	// preload image
	imgPreload = new Image();

	imgPreload.onload=function(){
		objImage.src = objLink.href;

		// center lightbox and make sure that the top and left values are not negative
		// and the image placed outside the viewport
		var lightboxTop = arrayPageScroll[1] + ((arrayPageSize[3] - 35 - imgPreload.height) / 2);
		var lightboxLeft = ((arrayPageSize[0] - 20 - imgPreload.width) / 2);

		objLightbox.style.top = (lightboxTop < 0) ? "0px" : lightboxTop + "px";
		objLightbox.style.left = (lightboxLeft < 0) ? "0px" : lightboxLeft + "px";


		objLightboxDetails.style.width = imgPreload.width + 'px';

		if(objLink.getAttribute('title')){
			objCaption.style.display = 'block';
			//objCaption.style.width = imgPreload.width + 'px';
			objCaption.innerHTML = objLink.getAttribute('title');
		} else {
			objCaption.style.display = 'none';
		}

		// A small pause between the image loading and displaying is required with IE,
		// this prevents the previous image displaying for a short burst causing flicker.
		if (navigator.appVersion.indexOf("MSIE")!=-1){
			pause(250);
		}
		else pause(200);

		if (objLoadingImage) {	objLoadingImage.style.display = 'none'; }

		// Hide select boxes as they will 'peek' through the image in IE
		selects = document.getElementsByTagName("select");		
        for (i = 0; i != selects.length; i++) {
                selects[i].style.visibility = "hidden";
        }


		objLightbox.style.display = 'block';

		// After image is loaded, update the overlay height as the new image might have
		// increased the overall page height.
		arrayPageSize = getPageSize();
		objOverlay.style.height = (arrayPageSize[1] + 'px');

		// Check for 'x' keypress
		listenKey();

		return false;
	}
	imgPreload.src = objLink.href;
}

function changeArrowState(arrowId,enabled) {
    document.getElementById(arrowId).style.visibility = enabled ? "visible" : "hidden";
}

function changeArrowEvent(enable) {
	var leftArrow = document.getElementById('prevImg');
	var rightArrow = document.getElementById('nextImg');
	leftArrow.disabled = enable ? false : true;
	leftArrow.style.opacity = enable ? .99 : .55;
	leftArrow.style.MozOpacity = enable ? .99 : .55;
	leftArrow.style.filter = enable ? 'alpha(opacity=' + (.99*100) + ')' : 'alpha(opacity=' + (.49*100) + ')';
	rightArrow.disabled = enable ? false : true;
	rightArrow.style.opacity = enable ? .99 : .55;
	rightArrow.style.MozOpacity = enable ? .99 : .55;
	rightArrow.style.filter = enable ? 'alpha(opacity=' + (.99*100) + ')' : 'alpha(opacity=' + (.55*100) + ')';
}

function showNextLightBox(direction) {
	changeArrowEvent(false);
	var theBoxImg = document.getElementById("lightboxImage");
	numImgActual=parseInt(getNumImgActual(theBoxImg.src));
	switch(direction) {
		case 'left' : 
    					if(numImgActual>1) {
	        				changeArrowState('nextImg',true);
			    	    	numImgActual--;
				    	    var newHrefBegin=(theBoxImg.src).substring(0,theBoxImg.src.indexOf("imgg"));
    		    			var newHrefEnd="imgg_"+getNumGallery(theBoxImg.src)+"_"+numImgActual+".jpg";
				   	    	if(numImgActual==1) {
		    					changeArrowState('prevImg',false);
				    		}
							theBoxImg.xOpacity = .99;
							so_xfade(newHrefBegin+newHrefEnd);
    					}
    	break;
		case 'right' : 
    					var totImages = parseInt(getTotImages(theBoxImg.src));
    					if(numImgActual<totImages) {
	        				changeArrowState('prevImg',true);
			    	    	numImgActual++;
				    	    var newHrefBegin=(theBoxImg.src).substring(0,theBoxImg.src.indexOf("imgg"));
    		    			var newHrefEnd="imgg_"+getNumGallery(theBoxImg.src)+"_"+numImgActual+".jpg";
				   	    	if(numImgActual==getTotImages(theBoxImg.src)) {
		    					changeArrowState('nextImg',false);
				    		}				    		
				    		theBoxImg.xOpacity = .99;
							so_xfade(newHrefBegin+newHrefEnd);
    					}
    	break;
    }
}

/////////////////////////////////////////////////////////////////////////////////////////////////////////////
function so_xfade(nextImgSrc)
{
	var Img = document.getElementById("lightboxImage");
	cOpacity = Img.xOpacity;
	cOpacity = nextImgSrc=="" ? cOpacity+.05 : cOpacity-.05;
	
	Img.xOpacity = cOpacity;
	
	setOpacity(Img);

	if(cOpacity<=0)
	{
		// cambia immagine vecchia con nuova
		Img.src = nextImgSrc;
		Img.xOpacity = 0;
		setTimeout("so_xfade('')",50);
	}
	else
	{
		if(Img.xOpacity>.99) {
			Img.xOpacity = .99;
			changeArrowEvent(true);
			return;
		}
		else
			setTimeout("so_xfade("+"'"+nextImgSrc+"'"+")",50);
	}	

	function setOpacity(obj)
	{
		obj.style.opacity = obj.xOpacity;
		obj.style.MozOpacity = obj.xOpacity;
		obj.style.filter = 'alpha(opacity=' + (obj.xOpacity*100) + ')';
	}
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////

//
// hideLightbox()
//
function hideLightbox()
{
	// get objects
	objOverlay = document.getElementById('overlay');
	objLightbox = document.getElementById('lightbox');

	// hide lightbox and overlay
	objOverlay.style.display = 'none';
	objLightbox.style.display = 'none';

	// make select boxes visible
	selects = document.getElementsByTagName("select");
    for (i = 0; i != selects.length; i++) {
		selects[i].style.visibility = "visible";
	}

	// disable keypress listener
	document.onkeypress = '';
	changeArrowState('prevImg',true)
	changeArrowState('nextImg',true)
	document.getElementById('keyboardMsg').style.display="";
}

//
// initLightbox()
// Function runs on window load, going through link tags looking for rel="lightbox".
// These links receive onclick events that enable the lightbox display for their targets.
// The function also inserts html markup at the top of the page which will be used as a
// container for the overlay pattern and the inline image.
//
function initLightbox()
{

	if (!document.getElementsByTagName){ return; }
	var anchors = document.getElementsByTagName("a");

	// loop through all anchor tags
	for (var i=0; i<anchors.length; i++){
		var anchor = anchors[i];

		if (anchor.getAttribute("href") && (anchor.getAttribute("rel") == "lightbox")){
			anchor.onclick = function () {showLightbox(this); return false;}
		}
	}

	// the rest of this code inserts html at the top of the page that looks like this:
	//
	// <div id="overlay">
	//		<a href="#" onclick="hideLightbox(); return false;"><img id="loadingImage" /></a>
	// </div>
	// <div id="lightbox">
	//		<a href="#" onclick="hideLightbox(); return false;" title="Click anywhere to close image">
	//			<img id="closeButton" />
	//			<img id="lightboxImage" />
	//		</a>
	//		<div id="lightboxDetails">
	//			<div id="lightboxCaption"></div>
	//			<div id="keyboardMsg"></div>
	//		</div>
	// </div>

	var objBody = document.getElementsByTagName("body").item(0);

	// create overlay div and hardcode some functional styles (aesthetic styles are in CSS file)
	var objOverlay = document.createElement("div");
	objOverlay.setAttribute('id','overlay');
	objOverlay.onclick = function () {hideLightbox(); return false;}
	objOverlay.style.display = 'none';
	objOverlay.style.position = 'absolute';
	objOverlay.style.top = '0';
	objOverlay.style.left = '0';
	objOverlay.style.zIndex = '90';
 	objOverlay.style.width = '100%';
	objBody.insertBefore(objOverlay, objBody.firstChild);

	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();

	// preload and create loader image
	var imgPreloader = new Image();

	// if loader image found, create link to hide lightbox and create loadingimage
	imgPreloader.onload=function(){

		var objLoadingImageLink = document.createElement("a");
		objLoadingImageLink.setAttribute('href','#');
		objLoadingImageLink.onclick = function () {hideLightbox(); return false;}
		objOverlay.appendChild(objLoadingImageLink);

		var objLoadingImage = document.createElement("img");
		objLoadingImage.src = loadingImage;
		objLoadingImage.setAttribute('id','loadingImage');
		objLoadingImage.style.position = 'absolute';
		objLoadingImage.style.zIndex = '150';
		objLoadingImageLink.appendChild(objLoadingImage);

		imgPreloader.onload=function(){};	//	clear onLoad, as IE will flip out w/animated gifs

		return false;
	}

	imgPreloader.src = loadingImage;

	// create lightbox div, same note about styles as above
	var objLightbox = document.createElement("div");
	objLightbox.setAttribute('id','lightbox');
	objLightbox.style.display = 'none';
	objLightbox.style.position = 'absolute';
	objLightbox.style.zIndex = '100';
	objBody.insertBefore(objLightbox, objOverlay.nextSibling);

	// create link
	var objLink = document.createElement("a");
	objLink.setAttribute('href','#');
	objLink.setAttribute('title','Clicca per chiudere');
	objLink.onclick = function () {hideLightbox(); return false;}
	objLightbox.appendChild(objLink);

	// preload and create close button image
	var imgPreloadCloseButton = new Image();

	// if close button image found,
	imgPreloadCloseButton.onload=function(){

		var objCloseButton = document.createElement("img");
		objCloseButton.src = closeButton;
		objCloseButton.setAttribute('id','closeButton');
		objCloseButton.style.position = 'absolute';
		objCloseButton.style.zIndex = '200';
		objLink.appendChild(objCloseButton);

		return false;
	}

	imgPreloadCloseButton.src = closeButton;

	// create image
	var objImage = document.createElement("img");
	objImage.setAttribute('id','lightboxImage');
	objLink.appendChild(objImage);

	// create details div, a container for the caption and keyboard message
	var objLightboxDetails = document.createElement("div");
	objLightboxDetails.setAttribute('id','lightboxDetails');
	objLightbox.appendChild(objLightboxDetails);

	// create caption
	var objCaption = document.createElement("div");
	objCaption.setAttribute('id','lightboxCaption');
	objCaption.style.display = 'none';
	objLightboxDetails.appendChild(objCaption);

	// create keyboard message
	var objKeyboardMsg = document.createElement("div");
	objKeyboardMsg.setAttribute('id','keyboardMsg');
    var ojbKLeftEvent="showNextLightBox('left');return false;";
    var ojbKRightEvent="showNextLightBox('right');return false;";
	var objKMsgLeft = '<input src="../images_web/img_prev.jpg" type="image" id="prevImg" onclick="'+ojbKLeftEvent+'">';
	var objKMsgCenter = '&nbsp;&nbsp;&nbsp;utilizza le frecce per scorrere le immagini&nbsp;&nbsp;&nbsp;';
	var objKMsgRight = '<input src="../images_web/img_next.jpg" type="image" id="nextImg" onclick="'+ojbKRightEvent+'">';
	objKeyboardMsg.innerHTML = objKMsgLeft+objKMsgCenter+objKMsgRight;
	objLightboxDetails.appendChild(objKeyboardMsg);
}

//
// addLoadEvent()
// Adds event to window.onload without overwriting currently assigned onload functions.
// Function found at Simon Willison's weblog - http://simon.incutio.com/
//

// addLoadEvent(initLightbox);	// run initLightbox onLoad