var prefsLoaded = false;
var defaultFontSize = 80;
var currentFontSize = defaultFontSize;

//Define as funções padrão para contraste
function contraste()
{
    if(getActiveStyleSheet() == 'Contraste')
    {
        setActiveStyleSheet('Padrão');
	//document.getElementById('contraste').innerHTML = 'alto contraste';
    }
    else
    {
        //document.getElementById('contraste').innerHTML = 'contraste normal';
	setActiveStyleSheet('Contraste');
    }
}

//Funcao para setar um estilo escolhido
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;
        }
    }
}

//Funcao para pegar um estilo setado
function getActiveStyleSheet()
{
    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 revertStyles(){

	currentFontSize = defaultFontSize;
	changeFontSize(0);

}

//Funcao para pegar um estilo preferencial
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 toggleColors(){
	if(currentStyle == "White"){
		setColor("Black");
	}else{
		setColor("White");
	}
}

function changeFontSize(sizeDifference){
	currentFontSize = parseInt(currentFontSize) + parseInt(sizeDifference * 5);

	if(currentFontSize > 130){
		currentFontSize = 130;
	}else if(currentFontSize < 60){
		currentFontSize = 60;
	}

	setFontSize(currentFontSize);
};

function setFontSize(fontSize){
	var stObj = (document.getElementById) ? document.getElementById('content_area') : document.all('content_area');
	document.body.style.fontSize = fontSize + '%';

	//alert (document.body.style.fontSize);
};


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;
};

window.onload = setUserOptions;

function setUserOptions(){
	if(!prefsLoaded){

		var cookie = readCookie("styleIF-RR");
		var title = cookie ? cookie : getPreferredStyleSheet();
                setActiveStyleSheet(title);

		cookie = readCookie("fontSize");
		currentFontSize = cookie ? cookie : defaultFontSize;
		setFontSize(currentFontSize);

		prefsLoaded = true;
	}

}

window.onunload = saveSettings;

function saveSettings()
{
    var title = getActiveStyleSheet();
    createCookie("styleIF-RR", title, 365);
    createCookie("fontSize", currentFontSize, 365);
}