var JSJACPACKET_USE_XMLNS = true;

function JSJaCPacket(name) {
  this.name = name;

  if (typeof(JSJACPACKET_USE_XMLNS) != 'undefined' && JSJACPACKET_USE_XMLNS)
    this.doc = XmlDocument.create(name,'jabber:client');
  else
    this.doc = XmlDocument.create(name,'');

  this.pType = function() { return this.name; };

  this.getDoc = function() { return this.doc; };
  this.getNode = function() { return this.getDoc().documentElement; };

  this.setTo = function(to) {
    if (!to || to == '')
      this.getNode().removeAttribute('to');
    else
      this.getNode().setAttribute('to',to); 
    return this; 
  };
  this.setFrom = function(from) {
    if (!from || from == '')
      this.getNode().removeAttribute('from');
    else
      this.getNode().setAttribute('from',from);
    return this;
  };
  this.setID = function(id) { 
    if (!id || id == '')
      this.getNode().removeAttribute('id');
    else
      this.getNode().setAttribute('id',id); 
    return this; 
  };
  this.setType = function(type) { 
    if (!type || type == '')
      this.getNode().removeAttribute('type');
    else
      this.getNode().setAttribute('type',type);
    return this; 
  };
  this.setXMLLang = function(xmllang) {
    if (!xmllang || xmllang == '')
      this.getNode().removeAttribute('xml:lang');
    else
      this.getNode().setAttribute('xml:lang',xmllang);
    return this;
  };

  this.getTo = function() { return this.getNode().getAttribute('to'); }
  this.getFrom = function() { return this.getNode().getAttribute('from'); }
  this.getID = function() { return this.getNode().getAttribute('id'); }
  this.getType = function() { return this.getNode().getAttribute('type'); }
  this.getXMLLang = function() { return this.getNode().getAttribute('xml:lang'); };
  this.getXMLNS = function() { return this.getNode().namespaceURI; };

  this.xml = function() { 
    if (this.getDoc().xml)
      return this.getDoc().xml;
    var xml = (new XMLSerializer()).serializeToString(this.getNode()); // opera needs the node
    if (typeof(xml) != 'undefined') 
      return xml;
    return (new XMLSerializer()).serializeToString(this.doc); // oldschool

  };

  this._childElVal = function(nodeName) {
    var aNode = this._getChildNode(nodeName);
    if (aNode && aNode.firstChild)
      return aNode.firstChild.nodeValue;
    return '';
  }

  this._getChildNode = function(nodeName) {
    var children = this.getNode().childNodes;
    for (var i=0; i<children.length; i++)
      if (children.item(i).tagName == nodeName)
        return children.item(i);
    return null;
  }

  this._replaceNode = function(aNode) {
    // copy attribs
    for (var i=0; i<aNode.attributes.length; i++)
      if (aNode.attributes.item(i).nodeName != 'xmlns')
        this.getNode().setAttribute(aNode.attributes.item(i).nodeName,aNode.attributes.item(i).nodeValue);

    // copy children
    for (var i=0; i<aNode.childNodes.length; i++)
      if (this.getDoc().importNode)
        this.getNode().appendChild(this.getDoc().importNode(aNode.childNodes.item(i),true));
      else
        this.getNode().appendChild(aNode.childNodes.item(i).cloneNode(true));
				
  };

  this._setChildNode = function(nodeName, nodeValue) {
    var aNode = this._getChildNode(nodeName);
    var tNode = this.getDoc().createTextNode(nodeValue);
    if (aNode)
      try {
        aNode.replaceChild(tNode,aNode.firstChild);
      } catch (e) { }
    else {
      aNode = this.getNode().appendChild(this.getDoc().createElement(nodeName));
      aNode.appendChild(tNode);
    }
    return aNode;
  }

  this.clone = function() { return JSJaCPWrapNode(this.getNode()); }
} 

function JSJaCPresence() {
  this.base = JSJaCPacket;
  this.base('presence');

  this.setStatus = function(status) {
    this._setChildNode("status", status);
    return this; 
  };
  this.setShow = function(show) {
    this._setChildNode("show",show);
    return this; 
  };
  this.setPriority = function(prio) {
    this._setChildNode("priority", prio);
    return this; 
  };
  this.setPresence = function(show,status,prio) {
    if (show)
      this.setShow(show);
    if (status)
      this.setStatus(status);
    if (prio)
      this.setPriority(prio);
    return this; 
  };

  this.getStatus = function() {	return this._childElVal('status');	};
  this.getShow = function() { return this._childElVal('show'); };
  this.getPriority = function() { return this._childElVal('priority'); };
}

function JSJaCIQ() {
  this.base = JSJaCPacket;
  this.base('iq');

  this.setIQ = function(to,from,type,id) {
    if (to)
      this.setTo(to);
    if (type)
      this.setType(type);
    if (from)
      this.setFrom(from);
    if (id)
      this.setID(id);
    return this; 
  };
  this.setQuery = function(xmlns) {
    var query;
    try {
      query = this.getDoc().createElementNS(xmlns,'query');
    } catch (e) {
      // fallback
      query = this.getDoc().createElement('query');
    }
    if (query && query.getAttribute('xmlns') != xmlns) // fix opera 8.5x
      query.setAttribute('xmlns',xmlns);
    this.getNode().appendChild(query);
    return query;
  };

  this.getQuery = function() {
    return this.getNode().getElementsByTagName('query').item(0);
  };
  this.getQueryXMLNS = function() {
    if (this.getQuery())
      return this.getQuery().namespaceURI;
    else
      return null;
  };
}

function JSJaCMessage() {
  this.base = JSJaCPacket;
  this.base('message');

  this.setBody = function(body) {
    this._setChildNode("body",body);
    return this; 
  };
  this.setSubject = function(subject) {
    this._setChildNode("subject",subject);
    return this; 
  };
  this.setThread = function(thread) {
    this._setChildNode("thread", thread);
    return this; 
  };
  this.getThread = function() { return this._childElVal('thread'); };
  this.getBody = function() { return this._childElVal('body'); };
  this.getSubject = function() { return this._childElVal('subject') };
}

/* ***
 * (static) JSJaCPWrapNode
 * transforms node to JSJaC internal representation (JSJaCPacket type)
 */
function JSJaCPWrapNode(node) {
  var aNode;
  switch (node.nodeName.toLowerCase()) {
  case 'presence':
    aNode = new JSJaCPresence();
    break;
  case 'message':
    aNode = new JSJaCMessage();
    break;
  case 'iq':
    aNode = new JSJaCIQ();
    break;
  default : // unknown
    return node;
  }

  aNode._replaceNode(node);

  return aNode;
}