/*
	Poll class
	-------------------------------------------------
	Copyright by Semaphor.
	If you want to use this library, you are very welcome.
	But please notice:
	
*/

var POLL_BAD_INSTANCE_CREATION = "Could not create XMLHTTP instance";
var POLL_EXCEPTION_TITLE = "An error occurred:";
var POLL_ERR_NO_ANSWERS = "Found no answer options.";

var POLL_MSXML_OBJECT1 = "Microsoft.XMLHTTP";
var POLL_MSXML_OBJECT2 = "Msxml2.XMLHTTP";

var AJAX_POLL_REQUEST_ID = "POLL";
/*
	PollOption  constructor method.
*/
function PollOption() {
	this.percent = 0;
	this.count = 0;
	this.text = "";
	this.value = "";
	this.checked = false;	//Added by jc@semaphor 11022008
}

/*
	Poll  constructor method.
*/
function Poll() {
	this.id = "";
	this.subject ="";
	this.options = new Array();
	this.labelVotesTotal = "";
	this.labelButtonVote = "";	
	this.imageURL = "";
	this.content = "";
	this.defaultOption = ""; //Added by jc@semaphor 11022008	
	this.width= 190;
}

var pollValue = null;
var pollId = null;

/*
	PollManager  constructor method.
*/
function PollManager(ownerId, language, elem, rootURL) {
 	this.ownerId = ownerId;
	this.language = language;
 	this.elem = elem;
 	this.rootURL = rootURL;
}

/*
	Trims a string.
*/
function trim(str){
	var i=0,p = str.length-1;
	while(str.charAt(i)==' ') i++;
	while(str.charAt(p)==' ') p--;
	if(i>p) return '';
	return str.substring(i,p+1);
}

/*
	Handles parsing and formatting the xml result.
*/
function parsePollXML(xmlReply) {

	var INDEX_ID = 0;
	var INDEX_SUBJECT = 1;
	var INDEX_CONTENT = 2;	
	var INDEX_IMAGE_URL = 3;		
	var INDEX_LABEL_VOTES_TOTAL = 4;	
	var INDEX_LABEL_BUTTON_VOTE = 5;		
	
	// The xml document
	var xmldoc = xmlReply;
	var root = xmldoc.documentElement;


	var poll = new Poll();
	poll.id = root.childNodes[INDEX_ID].childNodes[0].nodeValue;	
	poll.subject = root.childNodes[INDEX_SUBJECT].childNodes[0].nodeValue;	
	poll.content  = root.childNodes[INDEX_CONTENT].childNodes[0].nodeValue;
	poll.imageURL  = root.childNodes[INDEX_IMAGE_URL].childNodes[0].nodeValue;
	poll.labelVotesTotal = root.childNodes[INDEX_LABEL_VOTES_TOTAL].childNodes[0].nodeValue;
	poll.labelButtonVote = root.childNodes[INDEX_LABEL_BUTTON_VOTE].childNodes[0].nodeValue;
	
	var defaultOption = root.getElementsByTagName("option-default"); //Added by jc@semaphor 11022008
	if (defaultOption != null) {
		poll.defaultOption = defaultOption[0].childNodes[0].nodeValue;
	}

	var options = root.getElementsByTagName("option");
	
	// Are there any items?
	if(options.length == 0 ) {
		//alert(POLL_ERR_NO_ANSWERS);
		return;
	}	

	for (var index = 0; index < options.length; index++) {
		var po = new PollOption();
	
		po.percent = parseFloat(options[index].getAttribute("percent"));
		po.count = parseInt(options[index].getAttribute("count"));		

		var split = options[index].childNodes[0].nodeValue.split("|");
		po.text = trim(split[0]);
		po.value = trim(split[1]);
		
		if (po.value === poll.defaultOption) {	//Added by jc@semaphor 11022008
			po.checked = true;
		}

		poll.options[poll.options.length] = po;	

	}

	return poll;
}

/*
	Handles getting the current poll from the server, via AJAX..
*/
PollManager.prototype.getCurrentPoll = function (callbackFunction) {
  
 var pollElem= document.getElementById(this.elem);
 var manager = this;

		var request = ajaxHelper.createRequest(AJAX_POLL_REQUEST_ID);
		if (request == null) {
			alert(POLL_BAD_INSTANCE_CREATION);
			return false;
		}

		request.onreadystatechange = function() {
			try {  
				var request = ajaxHelper.getRequest(AJAX_POLL_REQUEST_ID);
				if (request.readyState != 4) return;
				if (request.status == 200) {

					var p = parsePollXML(request.responseXML);
					pollId = p.id
					callbackFunction( manager, p, pollElem);
				} else {
					// fall on our sword
				}
					
		} catch(exception)	{
			
//			var errMsg = POLL_EXCEPTION_TITLE;
//			alert(errMsg + exception.description );
		}
		}
		var url = this.rootURL + "/handlepollaction?openagent&action=get&ownerId=" +this.ownerId + "&languageId=" + this.language + "&ts=" + new Date().valueOf();

		request.open('GET', url , true);
		request.send(null);  
}

/*
	Handles sending the poll selection to the server, via AJAX..
*/
PollManager.prototype.registerPoll = function (callbackFunction) {

		 var manager = this;
		if(!ajaxHelper.browserSupportsCookies()) {
			alert("Du skal have cookies sl\u00E5et til for at stemme.")
			return;
		}
		var request = ajaxHelper.createRequest(AJAX_POLL_REQUEST_ID);
		if (request == null) {
			alert(POLL_BAD_INSTANCE_CREATION);
			return false;
		}

		request.onreadystatechange = function() {
			
			try {      	
				var request = ajaxHelper.getRequest(AJAX_POLL_REQUEST_ID);
				if (request.readyState != 4) return;
				if (request.status == 200) {

					callbackFunction( manager, true);
				} else {
					// fall on our sword
				}
					
		} catch(exception)	{
			var errMsg = POLL_EXCEPTION_TITLE;
			//alert(errMsg + exception.description );
		}
		}
		var url = this.rootURL + "/handlepollaction?openagent&action=set&ownerId=" +this.ownerId + "&pollId=" + pollId + "&pollValue=" + pollValue + "&ts=" + new Date().valueOf();

		request.open('GET', url , true);
		request.send(null);  
  
}

/*
	Handles showing the pollvoting panel.
*/
function showPollPanel( poll, element) {

	var nl = "<br>";
	var htmlData = "";

	if( poll.content !="") {
		htmlData += unescape(poll.content).replace(/\+/g, " ");
	}

	if( poll.imageURL !="") {
		htmlData +="<img src='" + poll.imageURL+"'>";
	}
	htmlData += "<div class='poll-info'><table cellspacing='0' cellpadding='0' width='100%' border='0'>";
	htmlData += "<tr><td valign='top' class='poll-question' colspan='2'>" + poll.subject+"</td></tr>";
	var checkedState = "";

	for(var index=0; index < poll.options.length; index++) {
		var po = poll.options[index];
		
		if (po.checked) {
			checkedState = "checked";
		}
		htmlData += "<tr><td colspan='2' style='height:5px;'></td></tr><tr><td valign='top' class='poll-radio-td'><input class='poll-radio' type='radio' id='pollOption" + index+"' name='pollOptions' value='" + po.value+"' onchange='pollValue=this.value' " + checkedState+"></td><td class='poll-answer' onclick='selectPoll("+index+")'>" + po.text + "</td></tr>";
		checkedState = "";
	}

	htmlData += "<tr><td colspan='0' valign='top' align='right' class='poll-bottom' colspan='2'><input class='poll-button' type='button' value='" + poll.labelButtonVote+"' onclick='pm.submitPoll()'></td></tr>"
	htmlData += "</table></div>"
	
	element.innerHTML = htmlData;
	
	//selectPoll(0);

}

/*
	Handles showing the poll result.
*/
function showPollResult( poll, element) {

	var totalVotes = 0;
	var nl = "<br>";
	var htmlData = "";
	
	if( poll.content !="") {
		htmlData += unescape(poll.content).replace(/\+/g, " ");
	}

	if( poll.imageURL !="") {
		htmlData +="<img src='" + poll.imageURL+"'>";
	}	
	htmlData += "<div class='poll-info'><table cellspacing='0' cellpadding='0' width='100%' border='0'>";
	htmlData += "<tr><td valign='top' class='poll-question' width='100%'>" + poll.subject+"</td></tr>";

	var totals = 0;
	htmlData +="<tr><td><table cellspacing='0' cellpadding='0' width='100%' border='0'>";
	var totalPercent = 0;
	for(var index=0; index < poll.options.length; index++) {

		var po = poll.options[index];
		totalVotes += po.count;

		var title = "";
		var pctValue = Math.round(po.percent);
/*		
	if(index+1==poll.options.length) {
		pctValue = 100 -totalPercent;		
	}
*/	
		totalPercent += pctValue;
		var pctText =  pctValue;
	
		htmlData += "<tr><td valign='top' class='poll-result-text'>" + po.text+"</td><td class='poll-result-percent'>" + pctText  +"%</td></tr>";
		htmlData += "<tr><td colspan='2' valign='top' class='poll-bar-td'  title='" + title+"' >";
		if(po.percent > 0.0) htmlData +="<div class='poll-bar' style='width:" + Math.round((poll.width-50) * (po.percent /100))+"px;'></div>";
		htmlData +="</td></tr>";

} 
	htmlData += "</table></td></tr>"
	htmlData += "<tr><td valign='top' class='poll-label-votes-total' colspan='2'>" + poll.labelVotesTotal+": " + totalVotes + "</td></tr>";
	htmlData += "</table></div>"
	element.innerHTML = htmlData;

}



/*
	Retrieves the current poll.
*/
PollManager.prototype.showPoll = function () {
	this.getCurrentPoll( callbackGetPoll);
}

/*
	Handles resitering the selected poll.
*/
PollManager.prototype.submitPoll = function () {
	if(pollValue == null) {
		alert("V\u00E6lg venligst et svar f\u00F8rst")
		return;
	}
	this.registerPoll( callbackRegisterPoll);	
}

/*
	Callback method for getting the right poll gui.
*/
function callbackGetPoll(manager, poll, element) { 

	if(!hasVoted(poll.id)) {
		showPollPanel(poll, element);
	} else {
		showPollResult(poll, element);	
	}
	if(placeMenuSpot!=null) placeMenuSpot();
}

/*
	Callback method for registering the selected poll answer.
*/
function callbackRegisterPoll(manager, success) { 
	setPollCookie(pollId);
	manager.showPoll();
}


/*
	Handles setting the selected poll radfiobutton, if the user clicks beside it.
*/
function selectPoll(index) {
	var elem = document.getElementById("pollOption"+ index);
	elem.checked=true;
	pollValue=elem.value;
}



/* Cookie methods. */

/*
	Checks to see if the user has answer this before.
*/
function hasVoted(pollId) {
	var cookieName = "poll" +pollId;
	var cookieValue = getPollCookie( pollId);
	if( cookieValue == '1') {
		return true;
	}
	return false

}

/*
	Set a cookie that registers that the user has answer this poll.
*/
	function setPollCookie( pollId) {
	
		var cookieName = "poll" +pollId;
		var cookieExpireDate = new Date;
		cookieExpireDate.setMonth( cookieExpireDate.getMonth()+2);
		
		var cookieValue = "1";
		var cookiePath = "/";
		var cookieStr = cookieName + '=' + cookieValue+'; path=' + cookiePath+'; expires=' + cookieExpireDate.toGMTString() ;
		document.cookie = cookieStr;
	}

/*
	Retrieves the poll cookie, if any.
*/
	function getPollCookie( pollId) {
		var name = "poll" +pollId;
		var index = -1;
		if(document.cookie) {
			index = document.cookie.indexOf( name);
		}

		if (index != -1) {
			var key = name + '=';
			var countbegin = (document.cookie.indexOf( key, index) + key.length);
			var countend = document.cookie.indexOf(';', index);

			if (countend == -1) {
				countend = document.cookie.length;
			}
			return document.cookie.substring(countbegin, countend);
		}
		return '';
	}