/*
	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
	- getPageScrollMap()
	- getPageSizeMap()
	- pauseMap()
	- getKeyMap()
	- listenKeyMap()
	- showLightboxGoogle()
	- hideLightboxGoogle()
	- initLightboxGoogle()
	- addLoadEvent()
	
	Function Calls
	- addLoadEvent(initLightboxGoogle)

*/



//
// Configuration
//

// If you would like to use a custom loading image or close button reference them in the next two lines.
var loadingImageMap = 'js/lightbox/loading.gif';		
var closeButtonMap = 'js/lightbox/close.gif';		


function stripPixelMap(valore){
	if(valore != ''){
		stop = valore.indexOf('px');
		if(stop > 0){
			return valore.substring(0, stop);
		} else return false;
	}
}


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

	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;
}



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


//
// pauseMap(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 pauseMap(numberMillis) {
	var now = new Date();
	var exitTime = now.getTime() + numberMillis;
	while (true) {
		now = new Date();
		if (now.getTime() > exitTime)
			return;
	}
}

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

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


//
// listenKeyMap()
//
function listenKeyMap () {	document.onkeypress = getKeyMap; }
	

//
// showLightboxGoogle()
// Preloads images. Pleaces new image in lightbox then centers and displays.
//
function showLightboxGoogle(objLink)
{
	// prep objects
	var objOverlay = document.getElementById('overlayGoogle');
	var objLightbox = document.getElementById('lightboxGoogle');
	var objCaption = document.getElementById('lightboxGoogleCaption');
	//var objImage = document.getElementById('lightboxImage');
	var objImage = document.getElementById('map_city');
	var objLoadingImage = document.getElementById('loadingMap');
	var objLightboxDetails = document.getElementById('lightboxGoogleDetails');

	
	var arrayPageSize = getPageSizeMap();
	var arrayPageScroll = getPageScrollMap();

	// 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';
	
	/* MOSTRA MAPPA */
	// 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 - stripPixelMap(objImage.style.height)) / 2);
	var lightboxLeft = ((arrayPageSize[0] - 20 - stripPixelMap(objImage.style.width)) / 2);

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


	objLightboxDetails.style.width = stripPixelMap(objImage.style.width) + 'px';
	
	if(objLink.getAttribute('title')){
		objCaption.style.display = 'block';
		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){
		pauseMap(250);
	} 

	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';
	objImage.style.visibility = 'visible';

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

	loadMapNews(objLink.getAttribute('title'));
	
}





//
// hideLightboxGoogle()
//
function hideLightboxGoogle()
{
	// get objects
	objOverlay = document.getElementById('overlayGoogle');
	objLightbox = document.getElementById('lightboxGoogle');
	var objImage = document.getElementById('map_city');
	
	// hide lightbox and overlay
	objOverlay.style.display = 'none';
	objLightbox.style.display = 'none';
	objImage.style.visibility = 'hidden';
	
	// 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 = '';
}




//
// initLightboxGoogle()
// 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 initLightboxGoogle()
{
	
	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") == "lightboxGoogle")){
			anchor.onclick = function () {showLightboxGoogle(this); return false;}
		}
	}

	// the rest of this code inserts html at the top of the page that looks like this:
	//
	// <div id="overlayGoogle">
	//		<a href="#" onclick="hideLightbox(); return false;"><img id="loadingMap" /></a>
	//	</div>
	// <div id="lightbox">
	//		<a href="#" onclick="hideLightbox(); return false;" title="Click anywhere to close image">
	//			<img id="closeMap" />		
	//			<img id="lightboxGoogle" />
	//		</a>
	//		<div id="lightboxGoogleDetails">
	//			<div id="lightboxGoogleCaption"></div>
	//			<div id="keyboardGoogleMsg"></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','overlayGoogle');
	objOverlay.onclick = function () {hideLightboxGoogle(); 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 = getPageSizeMap();
	var arrayPageScroll = getPageScrollMap();

	// 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 () {hideLightboxGoogle(); return false;}
		objOverlay.appendChild(objLoadingImageLink);
		
		var objLoadingImage = document.createElement("img");
		objLoadingImage.src = loadingImageMap;
		objLoadingImage.setAttribute('id','loadingMap');
		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 = loadingImageMap;

	// create lightbox div, same note about styles as above
	var objLightbox = document.createElement("div");
	objLightbox.setAttribute('id','lightboxGoogle');
	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','Click to close');
	objLink.onclick = function () {hideLightboxGoogle(); 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 = closeButtonMap;
		objCloseButton.setAttribute('id','closeMap');
		objCloseButton.style.position = 'absolute';
		objCloseButton.style.zIndex = '200';
		objLink.appendChild(objCloseButton);

		return false;
	}

	imgPreloadCloseButton.src = closeButtonMap;

	/* CREA DIV MAPPA */
	var map_div = document.createElement("div");
	map_div.id = 'map_city';
	map_div.style.width = '400px';
	map_div.style.height = '400px';
	map_div.style.textAlign = 'left';
	map_div.style.borderWidth = '2px';
	map_div.style.borderStyle = 'groove';
	map_div.style.borderColor = '#ececec';
	map_div.style.visibility = 'hidden';
	objLightbox.appendChild(map_div);

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

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

	// create keyboard message
	var objKeyboardMsg = document.createElement("div");
	objKeyboardMsg.setAttribute('id','keyboardGoogleMsg');
	objKeyboardMsg.innerHTML = 'Premi il tasto <a href="#" onclick="hideLightboxGoogle(); return false;"><kbd>x</kbd></a> per chiudere';
	objLightboxDetails.appendChild(objKeyboardMsg);


}