var updatepending = false;
var lastTimestamp = 0;
var targetid = "";
var intervalID = 0;

function checkEnter(e){
	var characterCode;
	if(e && e.which){
		//e = e
		characterCode = e.which;
	}
	else{
		//e = event;
		characterCode = e.keyCode;
	}
	if(characterCode == 13){
		sendText();
	}
	return false;
	
}

function sendText(){
	var chatlineentry = document.getElementById('chatline');
	var chatline = encodeURIComponent(chatlineentry.value);
	ajax_appendContent("chat-pane", "/phos-shed/rest/channel/service.do", "lastTimestamp="+lastTimestamp+"&targetid="+targetid+"&content="+chatline);
	chatlineentry.value = "";
}

function ajax_appendContent(divId,pathToFile,urlString){

	var ajaxIndex = dynamicContent_ajaxObjects.length;
	dynamicContent_ajaxObjects[ajaxIndex] = new sack();
	dynamicContent_ajaxObjects[ajaxIndex].requestFile = pathToFile;
	dynamicContent_ajaxObjects[ajaxIndex].URLString = urlString;
	dynamicContent_ajaxObjects[ajaxIndex].method="POST";
	
	dynamicContent_ajaxObjects[ajaxIndex].onCompletion = 
	function(){ ajax_showAppend(divId,ajaxIndex); };  

	dynamicContent_ajaxObjects[ajaxIndex].runAJAX();
	updatepending = true;
}

function ajax_showAppend(divId,ajaxIndex)
{
  ajax_innerHTML(divId, dynamicContent_ajaxObjects[ajaxIndex].response);
  dynamicContent_ajaxObjects[ajaxIndex] = false;
  updatepending = false;
}

function ajax_innerHTML(divId, content){
	if(content!=null && trim(content)!=""){
		var div = document.getElementById(divId);
		var oldTimestamp = document.getElementById("lastTimestamp");
		if(oldTimestamp){
			var parent = oldTimestamp.parentNode;
			parent.removeChild(oldTimestamp);
		}
		var el = document.createElement("div");
		div.appendChild(el);
		el.innerHTML=decodeURIComponent(content);
		lastTimestamp = document.getElementById("lastTimestamp").value;
		
		scrolltobottom();
	}
}

function myajaxloader(){
	if (updatepending==false){
		updatepending=true;
		var now = new Date();
		var time = now.getTime();
		ajax_appendContent("chat-pane", "/phos-shed/rest/channel/service.do", "lastTimestamp="+lastTimestamp+"&targetid="+targetid);
	}
}

function trim(str){
	return str.replace(/^\s\s*/, '').replace(/\s\s*$/, '');
}

function scrolltobottom(){
	var objDiv = document.getElementById("chat-pane");
	objDiv.scrollTop = objDiv.scrollHeight;
}

function initChannel(aTargetid){
	clearInterval(intervalID);
	targetid = aTargetid;
	updatepending = false;
	lastTimestamp = 0;
	intervalID = setInterval("myajaxloader()",1000);
	
	var winH = screen.height;
	var winW = screen.width;
	
	 // the more standards compliant browsers (mozilla/netscape/opera/IE7) use window.innerWidth and window.innerHeight
	
	 if (typeof window.innerWidth != 'undefined')
	 {
	      winW = window.innerWidth,
	      winH = window.innerHeight
	 }
	
	// IE6 in standards compliant mode (i.e. with a valid doctype as the first line in the document)
	
	 else if (typeof document.documentElement != 'undefined'
	     && typeof document.documentElement.clientWidth !=
	     'undefined' && document.documentElement.clientWidth != 0)
	 {
	       winW = document.documentElement.clientWidth,
	       winH = document.documentElement.clientHeight
	 }
	
	 // older versions of IE
	
	 else
	 {
	       winW = document.getElementsByTagName('body')[0].clientWidth,
	       winH = document.getElementsByTagName('body')[0].clientHeight
	 }
	
	var chatPane = document.getElementById('chat-pane');
	chatPane.style.height = ""+(winH-400)+"px";
	
	var channelDiv = document.getElementById('channel');
	channelDiv.style.top = "100px";
	channelDiv.style.right = "20px";
	
}

function closeChatPane(){
	clearInterval(intervalID);
	/* ajax call to close chat (remove sessionAttr "chatting" and append "{USER} has left the channel") */
	ajax_appendContent("chat-pane", "/phos-shed/channel/close.do", "targetid="+targetid);
	var div = document.getElementById("channel");
	div.style.display = "none";
	div.style.visibility = "hidden";
}

function showChannelNotify(targetid){
	ajax_loadContent('channelNotification','/phos-shed/channel/notification.do?targetid='+targetid);
	var div = document.getElementById("channelNotification");
	div.style.display = "block";
	div.style.visibility = "visible";
}

function hideChannelNotify(){
	var div = document.getElementById("channelNotification");
	div.style.display = "none";
	div.style.visibility = "hidden";
	return false;
}

function submitChannelNotificationForm(username, password, emailadd, currentUsername, targetid){
	ajax_loadContent('channelNotification', '/phos-shed/channel/notificationSubmit.do?username='+username+'&emailadd='+emailadd+'&password='+password+'&currentUsername='+currentUsername+'&targetid='+targetid);
}

function submitChannelLeaveMessageForm(targetid, replyToMessageid, message){
	var messageEnc = encodeURIComponent(message);
	ajax_loadContent('channelNotification', '/phos-shed/channel/sendMessage.do?targetid='+targetid+'&replyToMessageid='+replyToMessageid+'&message='+messageEnc);
}

function refreshme(){
	window.location.reload(true);
}

function toggleChatMinimized(){
	var channelInnerDiv = document.getElementById("channelinner");
	if(channelInnerDiv){
		if(channelInnerDiv.style.display == "none"){
			channelInnerDiv.style.display = "block";
			channelInnerDiv.style.visibilty = "visible";
		}else{
			channelInnerDiv.style.display = "none";
			channelInnerDiv.style.visibilty = "hidden";
		}
	}
}