/* namespacing object */
var net=new Object();

var debug = false;

net.READY_STATE_UNINITIALIZED=0;
net.READY_STATE_LOADING=1;
net.READY_STATE_LOADED=2;
net.READY_STATE_INTERACTIVE=3;
net.READY_STATE_COMPLETE=4;


/*--- content loader object for cross-browser requests ---*/
net.ContentLoader=function(url,onload,onerror,method,params,contentType){
  this.req=null;
  this.onload=onload;
  this.onerror=(onerror) ? onerror : this.defaultError;
  this.loadXMLDoc(url,method,params,contentType);
}

net.ContentLoader.prototype={
 loadXMLDoc:function(url,method,params,contentType){
  if (!method){
    method="GET";
  }
  if (!contentType && method=="POST"){
    contentType='application/x-www-form-urlencoded';
  }
  if (window.XMLHttpRequest){
    this.req=new XMLHttpRequest();
  } else if (window.ActiveXObject){
    this.req=new ActiveXObject("Microsoft.XMLHTTP");
  }
  if (this.req){
    try{
      var loader=this;
      this.req.onreadystatechange=function(){
        loader.onReadyState.call(loader);
      }
      this.req.open(method,url,true);
      if (contentType){
        this.req.setRequestHeader('Content-Type', contentType);
      }
      if(debug){
      alert(params);
      }
      this.req.send(params);
    }catch (err){
      this.onerror.call(this);
    }
  }
 },

 onReadyState:function(){
  var req=this.req;
  var ready=req.readyState;
  if (ready==net.READY_STATE_COMPLETE){
  var httpStatus=req.status;
    if (httpStatus==200 || httpStatus==0 || httpStatus==100){
      this.onload.call(this);
    }else{
      alert("error fetching data!"
    +"\n\nreadyState:"+ req.readyState
    +"\nstatus: "+ req.status
    +"\nheaders: "+ req.getAllResponseHeaders());
      //this.onerror.call(this);
    }
  }
 },

 defaultError:function(){
  alert("error fetching data!"
    +"\n\nreadyState:"+this.req.readyState
    +"\nstatus: "+this.req.status
    +"\nheaders: "+this.req.getAllResponseHeaders());
 }
}




net.cmdQueues=new Array();
net.Base;

net.CommandQueue=function(url,freq){
  net.Base = this;
  this.id="1";
  net.cmdQueues["1"]=this;
  this.url=url;
  this.queued=new Array();
  this.sent=new Array();
  if (freq){
    this.repeat(freq);
  }
}

net.CommandQueue.STATUS_QUEUED=-1;
net.CommandQueue.STATE_UNINITIALIZED=net.READY_STATE_UNINITIALIZED;
net.CommandQueue.STATE_LOADING=net.READY_STATE_LOADING;
net.CommandQueue.STATE_LOADED=net.READY_STATE_LOADED;
net.CommandQueue.STATE_INTERACTIVE=net.READY_STATE_INTERACTIVE;
net.CommandQueue.STATE_COMPLETE=net.READY_STATE_COMPLETE;
net.CommandQueue.STATE_PROCESSED=5;

net.CommandQueue.PRIORITY_NORMAL=0;
net.CommandQueue.PRIORITY_IMMEDIATE=1;


net.CommandQueue.prototype={
 addCommand:function(command){
  if (this.isCommand(command)){
  if(debug){
  alert("isCommand");
  }
    this.queued.append(command,true);
      if(debug){
      alert("added command");
      }
    if (command.priority==net.CommandQueue.PRIORITY_IMMEDIATE){
          if(debug){
          alert("PRIORITY_IMMEDIATE");
          }
      this.fireRequest();
    }
  }else{
	if(debug){
	alert("not command");
	}
  }
 },

 fireRequest:function(){
 var data = null;
 var commandStr = 'ajaxCommand=';
  data = "";
  if (this.queued.length==0){
    return;
  }
  for(var i=0;i<this.queued.length;i++){
	var cmd=this.queued[i];
    if (this.isCommand(cmd)){
        if(i > 0){
           data+='&';
           commandStr+=",";
        }
      commandStr += cmd.ajaxCommand + "~" + cmd.id ; 
      data+=cmd.ToRequestString();
      this.sent[cmd.id]=cmd;
    }
  } 
  data = commandStr + "&" + data;
  this.queued=new Array();
  this.loader=new net.ContentLoader(
    this.url,
    net.CommandQueue.onload,
    net.CommandQueue.onerror,
    "POST",data
  );
 },

 isCommand:function(obj){
  return (
    obj.implementsProp("id")
    && obj.implementsProp("priority")
    && obj.implementsFunc("ToRequestString")
    && obj.implementsFunc("ParseResponse")   
  );
 },

 repeat:function(freq){
  this.unrepeat();
  if (freq>0){
    this.freq=freq;
    var cmd="net.Base.fireRequest()";
    this.repeater=setInterval(cmd,freq*1000);
  }
 },

 unrepeat:function(){
  if (this.repeater){
    clearInterval(this.repeater);
  }
  this.repeater=null;
 }
}

net.CommandQueue.onload=function(){
if(debug){
alert("OnLoad");
}
  var xmlDoc=this.req.responseXML;
  var myText = this.req.responseText;
  var elDocRoot=xmlDoc.getElementsByTagName("commands")[0];

  if (elDocRoot){
    if(debug){
    alert("Good XML");
    }
    for(i=0;i<elDocRoot.childNodes.length;i++){
      elChild=elDocRoot.childNodes[i];
      if (elChild.nodeName=="command"){
        var attrs=elChild.attributes;
        var id=attrs.getNamedItem("id").value;
         //Get refence from myself here
            if(debug){
            alert(id);
            }
         command = net.Base.sent[id];   
       if (command){
           if(debug){
            alert("GotCommand");
            }           
          command.ParseResponse(elChild);
        }
      }
    }
  }
}

net.CommandQueue.onerror=function(){
  alert("problem sending the data to the server");
}


Object.prototype.implementsProp=function(propName){
  return (this[propName]!=null);
}

Object.prototype.implementsFunc=function(funcName){
  return (this[funcName]!=null); /*&& this[funcName] instanceof Function;*/
}