// XHTML live Chat
// author: alexander kohlhofer
// version: 1.0
// http://www.plasticshore.com
// http://www.plasticshore.com/projects/chat/
// please let the author know if you put any of this to use
// XHTML live Chat (including this script) is published under a creative commons license
// license: http://creativecommons.org/licenses/by-nc-sa/2.0/


var GetChaturl = "chat/getChatData.php";
var SendChaturl = "chat/sendChatData.php";
var lastID = -1; //initial value will be replaced by the latest known id
window.onload = initJavaScript;

function initJavaScript() {
	document.forms['chatForm'].elements['chatbarText'].setAttribute('autocomplete','off'); //this non standard attribute prevents firefox' autofill function to clash with this script
	checkStatus(''); //sets the initial value and state of the input comment
	checkName(); //checks the initial value of the input name
	receiveChatText(); //initiates the first data query
}

//initiates the first data query
function receiveChatText() {
	if (httpReceiveChat.readyState == 4 || httpReceiveChat.readyState == 0) {
  	httpReceiveChat.open("GET",GetChaturl + '?lastID=' + lastID + '&rand='+Math.floor(Math.random() * 1000000), true);
    httpReceiveChat.onreadystatechange = handlehHttpReceiveChat; 
  	httpReceiveChat.send(null);
	}
}

//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+3) { //goes through the result one message at a time
	    	insertNewContent(results[i+1],results[i+2],i); //inserts the new content into the page
	    }
	    lastID = results[results.length-4];
    }
    setTimeout('receiveChatText();',4000); //executes the next data query in 4 seconds
  }
}

//inserts the new content into the page
function insertNewContent(liName,liText,liID) {
	if (liID % 2 != 0) { bg = 'name bg0'; }
	else { bg = 'name bg1'; }

	insertO = document.getElementById("outputList");
	oLi = document.createElement('li');
	oLi.setAttribute('className',bg); //for IE's sake
	oLi.setAttribute('class',bg);
	oSpan = document.createElement('span');
	oSpan.setAttribute('className','name'); //for IE's sake
	oSpan.setAttribute('class','name');
	oName = document.createTextNode(liName+': ');
	oText = document.createTextNode(liText);
	oSpan.appendChild(oName);
	oLi.innerHTML = '<span class="name" classname="name">'+liName+' : </span>'+liText;
	insertO.insertBefore(oLi, insertO.firstChild);
}

String.prototype.trim = function() { return this.replace(/^\s+|\s+$/g, ''); }

//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;

		// zapisz nick do cookie
		saveIt('orzelpalowice_nick');	

		if (currentName.trim() != "") {
		param = 'n='+ currentName+'&c='+ currentChatText;	
		httpSendChat.open("POST", SendChaturl, 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;
	}
}

//******************************************
// COOKIES

var Cookies = {
	init: function () {
		var allCookies = document.cookie.split('; ');
		for (var i=0;i<allCookies.length;i++) {
			var cookiePair = allCookies[i].split('=');
			this[cookiePair[0]] = cookiePair[1];
		}
	},
	create: function (name,value,days) {
		if (days) {
			var date = new Date();
			date.setTime(date.getTime()+(days*24*60*60*1000));
			var expires = "; expires="+date.toGMTString();
		}
		else var expires = "";
		document.cookie = name+"="+value+expires+"; path=/";
		this[name] = value;
	},
	erase: function (name) {
		this.create(name,'',-1);
		this[name] = undefined;
	}
};
Cookies.init();

function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function eraseCookie(name) {
	createCookie(name,"",-1);
}

function saveIt(name) {
	var x = document.forms['chatForm'].elements['name'].value;
	if (!x)
		alert('Aby wysłać wiadomość musisz podać nick');
	else {
		Cookies.create(name,x,7);
		//alert('Cookie created');
	}
}

function readIt(name) {
	//alert('Twoj nick to ' + Cookies[name]);
	return Cookies[name];
}

function eraseIt(name) {
	Cookies.erase(name);
	alert('Dane zostaly wykasowane');
}

function init() {
	for (var i=1;i<3;i++) {
		var x = Cookies['orzelpalowice_nick' + i];
		if (x) alert('Cookie orzelpalowice_nick' + i + '\nthat you set on a previous visit, is still active.\nIts value is ' + x);
	}
}

// END COOKIES
//******************************************


//autoasigns a random name to a new user
function checkName() {
	currentName = document.forms['chatForm'].elements['name'];
	if (currentName.value == '') {
		if (Cookies['orzelpalowice_nick']) {
		currentName.value = Cookies['orzelpalowice_nick'];
		} //else {
		//currentName.value = 'gosc_'+ 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;
}


// initiates the two objects for sending and receiving data
var httpReceiveChat = getHTTPObject();
var httpSendChat = getHTTPObject();