var debug = false;
var activeStyleSheet;
var demon = null;
var auto = "";
var wHeight = 0;

function setActiveStyleSheet(title){
  if(debug) alert("setActiveStyleSheet:\n"+title);
  var i, a;
  var found = false;
  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;
        found = true;
      }
    }
  }
  if(debug) alert("setActiveStyleSheet\nFound: "+found);
  if(found==false){
    var title2 = getPreferredStyleSheet();
    if ((title2.lastIndexOf(" (Boxed)")==(title2.length - 8)) || (title2.lastIndexOf(" (Paged)")==(title2.length - 8))) title2 = title2.substring(0,(title2.length-8))+" (Auto)";
    //alert(title2);
    setActiveStyleSheet(title2);
  }
}

function getActiveStyleSheet(){
  //if(debug) alert("getActiveStyleSheet\n");
  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(){
  if(debug) alert("getPreferredStyleSheet\n");
  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(debug) alert("createCookie:\nName: "+name+"\nValue: "+value);
  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){
  if(debug) alert("readCookie:\n"+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 storePrefs(){
  if(debug) alert("storePrefs\n");
  createCookie("style", activeStyleSheet, 365);
  //alert("Webseiten-Stil gespeichert:\n \n"+activeStyleSheet);
}

function hideWarnings(){
  if(debug) alert("hideWarnings\n");
  if(navigator.cookieEnabled==false) return true;
  createCookie("hideWarnings", "1", 365);
  document.getElementById("warnings").className="hidden";
  return false;
}

function toggleWarnings(){
  if(debug) alert("toggleWarnings\n");
  if(navigator.cookieEnabled==false) document.getElementById("warning_cookies").className="warning";
  else if(readCookie("hideWarnings")=="1" && document.getElementById("warnings")) document.getElementById("warnings").className="hidden";
}

function toggleStyleSheet(){
  if(debug) alert("toggleStyleSheet\n");
  var i, a, title;
  var url="";
  title = (wHeight < 600) ? (auto+" (Paged)") : (auto+" (Boxed)");
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++){
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
      if(a.getAttribute("title") == title){
        url = a.getAttribute("href");
        break;
      }
    }
  }
  if(debug) alert("url: \n"+url);
  if(url!=""){
    for(i=0; (a = document.getElementsByTagName("link")[i]); i++){
      if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
        if(a.getAttribute("title") == activeStyleSheet){
          a.setAttribute("href", url, 0);
          break;
        }
      }
    }
    a.disabled=false;
  }
}

function siteDemon(){
  var curent = getActiveStyleSheet();
  if(debug) alert("siteDemon:\n"+activeStyleSheet+" => "+curent);
  if(curent != activeStyleSheet){
    if(debug) alert("siteDemon:\nCHANGE!");
    activeStyleSheet = curent;
    storePrefs();
    updateStyleChooser(curent);
    var pos = curent.lastIndexOf(" (Auto)");
    if(pos==(curent.length-7)){
      if(debug) alert("Auto-StyleSheet!");
      auto = curent.substring(0,pos);
      wHeight = 0;
    }
    else auto = "";
  }
  var h = (window.innerHeight) ? (window.innerHeight) : (document.documentElement.clientHeight);
  if(auto!="" && h!=wHeight){
    wHeight=h;
    toggleStyleSheet();
  }
}

function setTheme(){
  if(debug) alert("setTheme\n");
  var cookie = readCookie("style");
  if(!cookie){
    var title = getPreferredStyleSheet();
    if ((title.lastIndexOf(" (Boxed)")==(title.length - 8)) || (title.lastIndexOf(" (Paged)")==(title.length - 8))) title= title.substring(0,(title.length-8))+" (Auto)";
  }
  else var title = cookie
  setActiveStyleSheet(title);
  activeStyleSheet = "";
  if(debug){
    if(demon==null){
      demon = window.setInterval("siteDemon()", 10000);
      alert("Demon set!\n"+demon)
    }
  }
  else if(demon==null){
    demon = window.setInterval("siteDemon()", 1000);
  }
}

function initStyleChooser(){
  if(debug) alert("initStyleChooser\n");
  var chooser = document.getElementById("styleChooser");
  if(chooser){
    chooser.remove(0);
    var i,a;
    var Styles = new Array();
    for(i=0; (a = document.getElementsByTagName("link")[i]); i++){
      if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && Styles.join("\"").indexOf(a.getAttribute("title"))==-1) Styles.push(a.getAttribute("title"));
    }
    for(i=0; (a = Styles[i]); i++){
      var entry = document.createElement("option");
       entry.text = a;
       entry.value = a;
       var after = null;
       if (document.all) after = chooser.length;
       chooser.add(entry, after);
    }
    chooser.disabled = false;
    updateStyleChooser(getActiveStyleSheet());
  }
}

function updateStyleChooser(newStyle){
  if(debug) alert("updateStyleChooser:\n"+newStyle);
  var chooser = document.getElementById("styleChooser");
  if(chooser){
    var i,a;
    for(i=0; (a = chooser.options[i]); i++){
      if(a.value==newStyle) chooser.selectedIndex = i;
    }
  }
}

window.onload = function(e){
  setTheme();
  toggleWarnings();
  initStyleChooser()
}

window.onunload = function(e){
  window.clearInterval(demon);
}


//don't display js errors!
window.onerror = function(e){
  return true;
}

setTheme();
toggleWarnings();
initStyleChooser()