var selected = 0;

function selectLibrary(evt) {
  var node;
  if(dom) {
    node = this;
  } else if(ie) {
    node = evt.srcElement;
  }
  if(selected && selected != node) {
    if(selected.className == 'libraryselected') {
      selected.className = 'library';
    } else {
      selected.className = 'bookmark';
    }
    selected = node;
    node.className = 'libraryselected';
  } else if(!selected) {
    selected = node;
    node.className = 'libraryselected';
  }
}

function selectBookmark(evt) {
  var node;
  if(dom) {
    node = this;
  } else if(ie) {
    node = evt.srcElement;
  }
  if(selected && selected != node) {
    if(selected.className == 'libraryselected') {
      selected.className = 'library';
    } else {
      selected.className = 'bookmark';
    }
    selected = node;
    node.className = 'bookmarkselected';
  } else if(!selected) {
    selected = node;
    node.className = 'bookmarkselected';
  }
}

//////////////////////////////////////////////////////////////////////
// tar bort valt bokmärke eller folder(om det inte är roten
function removeNode(evt) {
  if(selected && selected.id != 'root') {
    if(selected.className == 'libraryselected') {
      if(selected.nextSibling.nodeType == 3) { // Textnode?
        selected.parentNode.removeChild(selected.nextSibling);
      }
      selected.parentNode.removeChild(selected.nextSibling);
    }
    selected.parentNode.removeChild(selected);
    selected = 0;
  }
}

setEventById('removeButton', 'click', removeNode);

//////////////////////////////////////////////////////////////////////
// Letar fram ett nytt unikt idvärde

var id = 0;
function getId() {
  id++;
  return 'tmp' + id;
} 

//////////////////////////////////////////////////////////////////////
// Lägger till en ny folder efter valt bokmärke eller som sista barn till vald folder
function insertFolder(evt)  {
  if(selected) {
    var library = document.createElement('div');
    var id = getId();
    var txt = '';
    while(txt == '') {
      txt = window.prompt('Folder name:', '');
    }
    if(txt == null) {
      return;
    }
    library.insertBefore(document.createTextNode(txt), null);
    var libraryContent = document.createElement('div');
    if(selected.className == 'libraryselected') {
      var ip = selected.nextSibling;
      if(ip.nodeType == 3) { // Textnode?
        ip = ip.nextSibling;
      }
      ip.insertBefore(library, null);
      ip.insertBefore(libraryContent, null);
    } else {
      selected.parentNode.insertBefore(libraryContent, selected);
      selected.parentNode.insertBefore(library,libraryContent);
      selected.parentNode.insertBefore(selected,library);
    }
    if(ie) { // ie tycker inte omm 'class'
      library.setAttribute('className', 'library');
      libraryContent.setAttribute('className', 'libraryContent');
    } else { // och mozilla tycker inte om className
      library.setAttribute('class', 'library'); 
      libraryContent.setAttribute('class', 'libraryContent');
    }
    library.setAttribute('id', id);
    setEventHandlers(id);
  }
}

setEventById('insertButton', 'click', insertFolder);

//////////////////////////////////////////////////////////////////////
// Flyttar en nod uppåt i trädet, om det är möjligt
function moveUp(evt) {
  if(selected && selected != document.getElementById('root') && selected != document.getElementById('root').firstChild) {
    var prevNode;
    if(selected == selected.parentNode.firstChild) {
  alert('hit');
      prevNode = selected.parentNode.previousSibling;
      if(prevNode.nodeType == 3) { // Textnode?
        prevNode = prevNode.previousSibling;
      }
      prevNode.parentNode.insertBefore(selected,prevNode);
    }
  }
}

setEventById('upButton', 'click', moveUp);

//////////////////////////////////////////////////////////////////////
// Sätter eventhandlers för elementet med id id och dess barn.
function setEventHandlers(id) {
  var node = document.getElementById(id);
  if(node.className == 'library') {
    setEventById(id, 'click', selectLibrary);
    node = node.nextSibling;
    if(node.nodeType == 3) { // Textnode?
      node = node.nextSibling;
    }
    var children = node.childNodes;
    for(var i = 0; i < children.length; i++) {
      if(children[i].className != 'libraryContent' && children[i].nodeType != 3) {  // !Textnode?
        setEventHandlers(children[i].id)
      }
    }
  } else {
    setEventById(id, 'click', selectBookmark);
  }
}

setEventHandlers('root');