var GetChaturl = "getChatData.php";
var SetUserurl = "setuser.php";
var SendChaturl =  "sendChatData.php";
var GetUserurl = "getuser.php";
var GetLogOuturl = "logout.php";
var lastID = -1; //initial value will be replaced by the latest known id

var httpReceiveChat = getHTTPObject();
var httpSendChat = getHTTPObject();
var httpbReceiveChat = getHTTPObject();
var httpcReceiveChat = getHTTPObject();
var httpLogOut = getHTTPObject();


function getUser() {
	if (httpcReceiveChat.readyState == 4 || httpcReceiveChat.readyState == 0) {
  	httpcReceiveChat.open("GET",'modules/Chat/getuser.php', true);
	httpcReceiveChat.onreadystatechange = handlehHttpReceiveUser;
	httpcReceiveChat.send(null);
	
	}
}
function handlehHttpReceiveUser() {
  if (httpcReceiveChat.readyState == 4) {
    result = httpcReceiveChat.responseText.split('---'); //the fields are seperated by ---
	buh = "";
	for(i=0;i < (result.length-1);i=i+2) { //goes through the result one message at a time
	    buh= buh +"<br>" +result[i];
    }
	  insertNewContentUser(buh); //inserts the new content into the page
  setTimeout('getUser();',4000); //executes the next data query in 4 seconds
 }
}

function insertNewContentUser(liUser) {
	document.getElementById("userList").innerHTML= liUser;
}


function logOut(){
	try{ 
	if (httpReceiveChat.readyState == 4){
	if (httpLogOut.readyState == 4 || httpLogOut.readyState == 0) {
		
	currentName = document.forms['chatForm'].elements['name'].value;
	param3 = 'n='+ currentName;	
	httpLogOut.open("POST",'modules/Chat/logout.php', true);
    //httpLogOut.onreadystatechange = handlehHttpReceiveUser; 
	httpLogOut.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
	httpLogOut.send(param3);	
  	httpLogOut.send(null);
	}
	}
	}catch(e){
		
	}finally{
		
	}
}
function insertUser() {
	if (httpbReceiveChat.readyState == 4 || httpbReceiveChat.readyState == 0) {
	currentName = document.forms['chatForm'].elements['name'].value;
	param1 = 'n='+ currentName;	
	httpbReceiveChat.open("POST",'modules/Chat/setuser.php', true);
	httpbReceiveChat.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
    httpbReceiveChat.onreadystatechange = handlehHttpReceiveChat; 
	httpbReceiveChat.send(param1);
  	httpbReceiveChat.send(null);
  	
  	
	}
}

function receiveChatText() {
	if (httpReceiveChat.readyState == 4 || httpReceiveChat.readyState == 0) {
  	httpReceiveChat.open("GET",'modules/Chat/getChatData.php?lastID=' + lastID, true);
	httpReceiveChat.onreadystatechange = handlehHttpReceiveChat; 
	
	httpReceiveChat.send(null);
	
	getUser();
	}
	
}
//deals with the servers' reply to requesting new content

function handlehHttpReceiveChat() {
  if (httpReceiveChat.readyState == 4 ) {
    results = httpReceiveChat.responseText.split('---'); //the fields are seperated by ---
    if (results.length > 2) {
	    for(i=0;i < (results.length-1);i=i+4) { //goes through the result one message at a time
	    	insertNewContent(results[i+1],results[i+2],results[i+3]); //inserts the new content into the page
	    }
	    lastID = results[results.length-5];
    }
    setTimeout('receiveChatText();',4000); //executes the next data query in 4 seconds
  }
}

//inserts the new content into the page
function insertNewContent(liName,liText,liTime) {
	insertO = document.getElementById("outputList");
	oLi = document.createElement('li');
	oSpan = document.createElement('span');
	oSpan.setAttribute('className','name'); //for IE's sake
	oSpan.setAttribute('class','name');
	oName = document.createTextNode(liName+': ');
	oText = document.createTextNode(liText);
	oTime = document.createTextNode(liTime+'-');
	oSpan.appendChild(oTime);
	oSpan.appendChild(oName);
	oLi.appendChild(oSpan);
	oLi.appendChild(oText);
	insertO.insertBefore(oLi, insertO.firstChild);
}

//stores a new comment on the server
function sendComment() {
	currentChatText = document.forms['chatForm'].elements['chatbarText'].value;
	if (currentChatText != '' & (httpSendChat.readyState == 4 || httpSendChat.readyState == 0)) {
		currentName = document.forms['chatForm'].elements['name'].value;
		param = 'n='+ currentName+'&c='+ currentChatText;	
		httpSendChat.open("POST",'modules/Chat/sendChatData.php', true);
		httpSendChat.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
  	httpSendChat.onreadystatechange = handlehHttpSendChat;
  	httpSendChat.send(param);
  	document.forms['chatForm'].elements['chatbarText'].value = '';
	} else {
		setTimeout('sendComment();',1000);
	}
}

//deals with the servers' reply to sending a comment
function handlehHttpSendChat() {
  if (httpSendChat.readyState == 4) {
  	receiveChatText(); //refreshes the chat after a new comment has been added (this makes it more responsive)
  }
}


//does celver things to the input and submit
function checkStatus(focusState) {
	currentChatText = document.forms['chatForm'].elements['chatbarText'];
	oSubmit = document.forms['chatForm'].elements['submit'];
	if (currentChatText.value != '' || focusState == 'active') {
		oSubmit.disabled = false;
	} else {
		oSubmit.disabled = true;
	}
}

//autoasigns a random name to a new user
function checkName() {
	currentName = document.forms['chatForm'].elements['name'];
	if (currentName.value == '') {
		currentName.value = 'guest_'+ Math.floor(Math.random() * 10000);
	}
}


//initiates the XMLHttpRequest object
//as found here: http://www.webpasties.com/xmlHttpRequest
function getHTTPObject() {
  var xmlhttp;
  /*@cc_on
  @if (@_jscript_version >= 5)
    try {
      xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (e) {
      try {
        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
      } catch (E) {
        xmlhttp = false;
      }
    }
  @else
  xmlhttp = false;
  @end @*/
  if (!xmlhttp && typeof XMLHttpRequest != 'undefined') {
    try {
      xmlhttp = new XMLHttpRequest();
    } catch (e) {
      xmlhttp = false;
    }
  }
  return xmlhttp;
}

function unLoadFnc(evt){
  var e = (window.event) ? window.event : evt;
  logOut();
}