// Global variables
var isCSS, isW3C, isIE4, isNN4, isIE6CSS;

// initialize upon load to let all browsers establish content objects
function initDHTMLAPI () {
if (document.images) {
	//isCSS = (document.body && document.body.style) ? true : false;
	isCSS = true;
	isW3C = (isCSS && document.getElementById) ? true : false;
	isIE4 = (isCSS && document.all) ? true : false;
	isNN4 = (document.layers) ? true : false;
	isIE6CSS = (document.compatMode && document.compatMode.indexOf("CSS1") >= 0) ? true : false;
}
}

// seek nested NN4 layer from string name
function seekLayer(doc, name) {
var theObj;
for (var i=0; i < doc.layers.length; i++) {
	if (doc.layers[i].name == name) {
		theObj = doc.layers[i];
		break;
	}
	// dive into nested layers if necessary
	if (doc.layers[i].document.layers.length > 0) {
		theObj = seekLayer(document.layers[i].document, name);
	}
}
return theObj;
}

// convert object name string or object reference
// into a valid element object reference

function getRawObject(obj) {
var theObj;
if (typeof obj == "string") {
	if (isW3C) {
		theObj = document.getElementById(obj);
	} else if (isIE4) {
		theObj = document.all(obj);
	} else if (isNN4) {
		theObj = seekLayer(document, obj);
	}
} else {
	//pass through object reference
	theObj = obj;
}
return theObj;
}

// Convert object name string  or object reference
// into a valid style (or NN4  layer) reference

function getObject(obj) {
var theObj = getRawObject(obj);
//alert(theObj);
if (theObj && isCSS) {
	theObj = theObj.style;
}
return theObj;
}

//set the visibility of an object to visible (inline)
function showInline(obj) {
var theObj = getObject(obj);
if (theObj) {
	theObj.display = "inline";
}
}

//set the visibility of an object to hidden
function hide(obj) {
var theObj = getObject(obj);
if (theObj) {
	theObj.display = "none";
}
}

var debug=false;
function isThisAnUpdateCandidate( url ) {
}

function processLink(tag)
{
}

function updateLinks() {
}

var debug = false;
function rotateToNextFontSize() {
var i;
var allUniqueCssTitles = getAllUniqueStyleSheetTitlesSansPrint();
var activeIndex = findValueInArray(getActiveStyleSheetTitle(), allUniqueCssTitles);
if (debug) alert("main: getActiveStyleSheetTitle->"+getActiveStyleSheetTitle()+", activeIndex="+activeIndex+", getCssDirection()="+getCssDirection());
activeIndex += getCssDirection();
// Put activeIndex back in a valid range in case the user modified something
if (activeIndex > allUniqueCssTitles.length-1) activeIndex = allUniqueCssTitles.length-1;
else if (activeIndex < 0) activeIndex = 0;

if (debug) alert(allUniqueCssTitles[activeIndex]);

setActiveStyleSheet(allUniqueCssTitles[activeIndex]);

/* Set the direction of the font changer */
if (activeIndex == allUniqueCssTitles.length-1){
	setCssDirection(-1);
	if (debug) alert("main: Heading down now");
}
else if (activeIndex == 0){
	setCssDirection(1);
	if (debug) alert("main: Heading up now");
}
else {
	if (debug) alert("main: activeIndex="+activeIndex+", allUniqueCssTitles.length-1="+(allUniqueCssTitles.length-1)+" no change in direction");
}

processIncreaseButton();
}

function setCssDirection(direction){
if (direction==1)
	createCookie("direction", "up", 365);
else 
	createCookie("direction", "down", 365);
}

function getCssDirection() {
if (readCookie("direction")=="down") return -1;
return 1;
}

function setPrintMode() { 
var linkArray = document.getElementsByTagName("link");
var returnArray = new Array();
for(i=0; (a = linkArray[i]); i++) {
	if(
	   a.getAttribute("rel").indexOf("style")!=-1 
	   && 
	   a.getAttribute("title") == "print"
	)
	{
		createCookie("formerCSS", getActiveStyleSheetTitle(), 365);
		setActiveStyleSheet(a.getAttribute("title"));
		return;
	}
}
}

function returnFromPrintMode() {
setActiveStyleSheet( readCookie("formerCSS") );
}

function getAllStyleSheets() {
var linkArray = document.getElementsByTagName("link");
var returnArray = new Array();
for(i=0; (a = linkArray[i]); i++) {
	if(
	   a.getAttribute("rel").indexOf("style")!=-1 
	   && 
	   a.getAttribute("title") 
	   && 
		(
			!a.getAttribute("media")
				|| 
			a.getAttribute("media").indexOf("print")==-1 
		)
	)
	{
		returnArray.push(a);
	}
}
return returnArray;
}

function getAllUniqueStyleSheets() {

var allStyleSheets = getAllStyleSheets();

var allCssTitles = new Array();
var allCss = new Array();

for (var i=0; i<allStyleSheets.length; ++i) {

	if ( -1 == findValueInArray(allStyleSheets[i].getAttribute("title"), allCssTitles )  )
	{
		allCssTitles.push(allStyleSheets[i].getAttribute("title"));
		allCss.push(allStyleSheets[i]);
	}

}

return allCss;
}

function getAllUniqueStyleSheetTitles() {

var returnArray = new Array();

var allUnique = getAllUniqueStyleSheets();
for (var i=0; i<allUnique.length; ++i) {
	returnArray.push(allUnique[i].getAttribute("title"));
}

return returnArray;
}
function getAllUniqueStyleSheetTitlesSansPrint() {
var returnArray = new Array();

var allUnique = getAllUniqueStyleSheets();
for (var i=0; i<allUnique.length; ++i) {
	if (allUnique[i].getAttribute("title")!="print") returnArray.push(allUnique[i].getAttribute("title"));
}

return returnArray;
}

function findValueInArray(needle, haystack) {

var debug = false;

for (var i=0; i<haystack.length; ++i) {
	if (haystack[i]==needle) return i;
}

return -1;
}
function setActiveStyleSheet(title) {
var i, a, main;
for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
a.disabled = true;
if(a.getAttribute("title") == title){
	  a.disabled = false;
  }
}
}
}

function getActiveStyleSheetTitle() {
var i, a;
for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && !a.disabled) return a.getAttribute("title");
}
return null;
}

function getPreferredStyleSheet() {
var i, a;
for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
if(a.getAttribute("rel").indexOf("style") != -1
&& a.getAttribute("rel").indexOf("alt") == -1
&& a.getAttribute("title")
) return a.getAttribute("title");
}
return null;
}

function createCookie(name,value,days) {
if (days) {
var date = new Date();
date.setTime(date.getTime()+(days*24*60*60*1000));
var expires = "; expires="+date.toGMTString();
}
else expires = "";
document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
var nameEQ = name + "=";
var ca = document.cookie.split(';');
for(var i=0;i < ca.length;i++) {
var c = ca[i];
while (c.charAt(0)==' ') c = c.substring(1,c.length);
if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
}
return null;
}

function processIncreaseButton(){

 if (getCssDirection()<0) {
	  showInline( getRawObject ("decreaseOption") );
	 showInline( getRawObject ("decreaseOption2") );
	 hide( getRawObject("increaseOption") );
	 hide( getRawObject("increaseOption2") );
 }
 else {
	 showInline( getRawObject("increaseOption") );
	 showInline( getRawObject("increaseOption2") );
	 hide( getRawObject ("decreaseOption") );
	 hide( getRawObject ("decreaseOption2") );
 }
 return true;
}

function styleSwitcherOnLoad() {
var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);  
processIncreaseButton();
}


//jses_addEvent(window, "onload", styleSwitcherOnLoad);

/*window.onload = function(e) {
styleSwitcherOnLoad();
}
*/
/*window.onload = function(e) {
var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);
}
*/

function startDown() {
var title = getActiveStyleSheetTitle();
createCookie("style", title, 365);
}

window.onunload = function(e) {
var title = getActiveStyleSheetTitle();
createCookie("style", title, 365);
}


var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);


function startUp() {
initDHTMLAPI();
updateLinks();
styleSwitcherOnLoad();
}

function startDown() {
// Store the active style sheet...
var title = getActiveStyleSheetTitle();

// But NOT if it's the print css..
if (getActiveStyleSheetTitle()!="print") {
createCookie("style", title, 365);
}  
}

window.onload = startUp;
window.onunload = startDown;