$(document).ready(function(){
	
	/*******
	** vp - print functionality - (c) - 0.0.1 **
	*******/
	$('.contentNav').find('li').each(function(){
		if ( $(this).hasClass('print')) {
			$(this).click(function() {
				window.print();
				return false;
			});
			$(this).toggle();
		}
	});
	
	/*******
	** vp - add target = _blank - (c) - 0.0.1 **
	*******/
	$('.extern').attr('target', '_blank');
	$('.pdffile').attr('target', '_blank');


	//pick one out of five stylesheets for the font size
	//and save in a cookie	//createCookie("fontsize","",-1); //delete cookie - only for testing, do not remove comment!
	var c = readCookie("fontsize");
	if(c) {
		setFont(c);
		makeControls(c);
	}
	else {
		createCookie("fontsize",3,"");
		makeControls(3);
	}
});

function makeControls(c) {
	//draw the "Tekstgrootte" header and the plus and minus buttons
	var divTag = document.getElementById("textsize");	
	var ulTag = document.createElement('ul');
	var liTag = document.createElement('li');
	var liTag1 = document.createElement('li');
	var liTag2 = document.createElement('li');
	var aTag1 = document.createElement('a');
	var aTag2 = document.createElement('a');
	var liText = document.createTextNode('Tekstgrootte');
	var aText1 = document.createTextNode('-');
	var aText2 = document.createTextNode('+');
	
	liTag.appendChild(liText);
	aTag1.appendChild(aText1);
	aTag2.appendChild(aText2);
	
	liTag1.appendChild(aTag1);
	liTag2.appendChild(aTag2);
	ulTag.appendChild(liTag);
	ulTag.appendChild(liTag1);
	ulTag.appendChild(liTag2);
	divTag.appendChild(ulTag);
	
	aTag1.setAttribute("id","smaller");
	aTag2.setAttribute("id","larger");
	aTag1.setAttribute("title","smaller");
	aTag2.setAttribute("title","larger");
	
	if(c > 1) aTag1.setAttribute("href","#textsmaller");
	else aTag1.className = "inactive";
	
	if(c < 5) aTag2.setAttribute("href","#textlarger");
	else aTag2.className = "inactive";
	
	addListener(aTag1,-1);
	addListener(aTag2,1);
}

//the actual resizing (changing of stylesheet)

function resize(value) {
	//calculate the new size
	var c = readCookie("fontsize");
	if(c) {
		//get the number from the cookie and make it an int
		var oldSize = readCookie("fontsize") - 0;
	}
	else {
		//if something went wrong (e.g. IE6, in multipleIEs), at least the current font size is 3
		oldSize = 3;
	}
	//newsize is (oldsize + 1) or (oldsize + -1)
	var newSize = oldSize + value;
	if(0 < newSize && newSize < 6) {
		setFont(newSize);
		//test if we should deactivate a button (to prevent sizes bigger than 5 or smaller than 0) or reactivate one
		if(oldSize == 4 && newSize == 5) removeLink("larger");
		if(oldSize == 2 && newSize == 1) removeLink("smaller");
		if(oldSize == 5 && newSize == 4) addLink("larger",1);
		if(oldSize == 1 && newSize == 2) addLink("smaller",-1);
	}
}

function setFont(fontsize) {
	//get the link tag by id and change the href, update the cookie
	var l = document.getElementById("fontsize");
	l.href = "\/static\/css\/tekstgrootte"+fontsize+".css";
	createCookie("fontsize",fontsize,"");
}

//functions for the links

function removeLink(id) {
	//deactivate a button to prevent sizes bigger than 5 or smaller than 0
	var el = document.getElementById(id);
	var nr = 1;
	if(id == "smaller") nr = -1;
	el.removeAttribute("href");
	el.className = "inactive";
}

function addLink(id,nr) {
	//activate a button if we need it again
	var el = document.getElementById(id);
	el.setAttribute("href","#text"+id);
	el.className = "";
}

function addListener(tag,param) {
	//add eventListener with the resize function and the correct param
	if (tag.addEventListener){
		tag.addEventListener('click',function(){resize(param);},false); 
	}
	else if (tag.attachEvent){
		tag.attachEvent('onclick',function(){resize(param);});
	}
}

//cookie functions

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 var 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 eraseCookie(name) {
	createCookie(name,"",-1);
}