var write = function()
{
	if(ZITALK_LASTPID==-1) // if lastPId is -1 the chat is loading you can't send message
		return false;

	var comment = document.getElementById('zitalk_comment');
	var loading = document.getElementById('loading');

	var a = new zajax();
	a.page = ZITALK_PAGE+"?"+Math.random()+"="+Math.random();
	a.query = "action=write&data="+encodeURIComponent(comment.value);

	a.onRequest = function()
	{
		ZITALK_SENDING = true; // if message is sending the chat stop loading for syncronyzing reasons
	};

	a.onError = function()
	{
		alert('Error saving comment, please try again');
		ZITALK_SENDING = false;
	};

	a.onComplete = function(t)
	{
		removeAllChilds(loading); // hide loading message
		ZITALK_SENDING = false; // finish saving comment, the chat can load normally
		comment.value = ''; // empty comment box
		comment.focus(); // focus comment box
	};
	a.request();
};

var read = function(id)
{
	if(ZITALK_SENDING==true)
		return false;
	var chat = document.getElementById('chat');
	var tmpCommentsId = new Array();
	if(ZITALK_LASTPID==-1) //first DDBB read
	{
		ZITALK_LASTPID = 0;
		ZITALK_FIRSTLOAD = true; // first load of chat don't show with animations
	}
	var a = new zajax();
	a.page = ZITALK_PAGE+"?"+Math.random()+"="+Math.random();
	a.query = "action=read&data="+id;
	a.response = 'XML';

	a.onRequest = function()
	{
		ZITALK_SENDING = true;
		if(ZITALK_FIRSTLOAD==true)
		{
			removeAllChilds(chat);
			var txt = document.createTextNode('Loading...');
			var img = document.createElement('img');
			img.src = 'img/loading.gif';
			img.alt = 'loading';
			chat.appendChild(txt);
			chat.appendChild(img);
		}
	};

	a.onError = function()
	{
		alert('Error reading DDBB');
		ZITALK_SENDING = false;
	};

	a.onComplete = function(t)
	{
		if(ZITALK_FIRSTLOAD==true)
			removeAllChilds(chat); // hide loading message
		if(t)
		{
			var messages = t;
			messages = messages.getElementsByTagName('ms').item(0);
			var message = messages.getElementsByTagName('m');
			for(var i=0;i<message.length;i++)
			{
				var id = message[i].getElementsByTagName('i');
				id = id.item(0);
				id = id.firstChild.nodeValue;

				if(in_array(id,tmpCommentsId)==true) // if repeated ID in the same ajax response break
					break;

				var p = document.createElement('p');
				p.id = "p"+id;

				var date = message[i].getElementsByTagName('d').item(0).firstChild.nodeValue;
				var time = message[i].getElementsByTagName('h').item(0).firstChild.nodeValue;
				var name = message[i].getElementsByTagName('n').item(0).firstChild.nodeValue;

				var span = document.createElement('span');
				span.title = "Posted at "+time+" on "+date;
				var txt = document.createTextNode(time+" - "+name+": ");
				span.className = 'dateuser';
				span.appendChild(txt);

				p.appendChild(span);

				var comment = message[i].getElementsByTagName('c').item(0);

				var childs = comment.childNodes;
				for(var j=0;j<childs.length;j++)
				{
					if(childs[j].nodeType != 1) continue;
					if(childs[j].nodeName=='a')
					{
						var href = childs[j].firstChild.nodeValue;
						var ele = document.createElement(childs[j].nodeName);
						ele.href = href;
						ele.onclick = function(){window.open(href); return false;};
						ele.title = href;
						ele.appendChild(document.createTextNode(href));
					}
					else if(childs[j].nodeName=='img')
					{
						var ele = document.createElement(childs[j].nodeName);
						ele.src = childs[j].getAttribute('src');
						ele.title = childs[j].getAttribute('title');
						ele.alt = childs[j].getAttribute('alt');
					}
					else
						var ele = document.createTextNode(childs[j].firstChild.nodeValue);
					p.appendChild(ele);
				}

				chat.appendChild(p); // insert p into chat

				ZITALK_LASTPID = parseInt(id); // set last id into variable
				tmpCommentsId[i] = id; //add id to array
			}

			if(ZITALK_SOUND==true) // if sound is ON
				if(ZITALK_FIRSTLOAD!=true) // if sound is activated and isn't the first chat load
					soundManager.play('bonk'); // play bonk sound

			if(ZITALK_FIRSTLOAD==true)
			{
				if(ZITALK_AUTOSCROLL===true)
					new toScroll(chat, 'bottom', 350);				
			}
			else
			{
				document.title = "ZiTALK: Ajax Chat: Somebody puts "+ZITALK_LASTPID+" comment ;)"; // change document title	
				if(ZITALK_AUTOSCROLL===true)
					new toScroll(chat, 'bottom', 150);				
			}

			ZITALK_FIRSTLOAD = false; // set the firstload to false				
		}
		ZITALK_SENDING = false;
	};
	a.request();
};

var lastId = function()
{
	if(ZITALK_SENDING==true) // if message is sending cancel chat refresh
		return false;

	var a = new zajax();
	a.page = ZITALK_PAGE+"?"+Math.random()+"="+Math.random();
	a.query = "action=maxId&data="+ZITALK_LASTPID;

	a.onComplete = function(t)
	{
		if(t)
			if(ZITALK_LASTPID!=t || ZITALK_LASTPID==-1) //if last P ID is different than DDBB last ID, read DDBB comments
				read(ZITALK_LASTPID);
	};

	a.request();
};

var onlineUsers = function()
{
	var a = new zajax();
	a.page = ZITALK_PAGE+"?"+Math.random()+"="+Math.random();
	a.query = "action=readOu";
	a.response = 'XML';	

	a.onComplete = function(t)
	{
		var ul = document.getElementById('online_ul');
		var lis = ul.getElementsByTagName('li');
		var len = lis.length;
		while(len>0)
		{
			lis[0].parentNode.removeChild(lis[0]);
			len--;
		}
		if(t)
		{
			var users = t.getElementsByTagName('us').item(0);
			var user = users.getElementsByTagName('u');
			for(var i=0;i<user.length;i++)
			{
				if(user[i].nodeType != 1) continue;
				var li = document.createElement('li');
				li.appendChild(document.createTextNode(user[i].firstChild.nodeValue));
				ul.appendChild(li);
			}
		}
	};
	a.request();
};

var login = function()
{
		new setIntervals('close');	
		var a = new zmodal();
		a.width = '250';
		a.height = '75';
		a.type = 'html';
		a.title = 'Please insert nickname';
		a.content = '<p><input type="text" id="login_name" /><input id="login_send" type="button" value="send" /></p>';
		a.main();	
		a.onClose = function()
		{
			a = null;
			new setIntervals('open');			
		};
		
		document.getElementById('login_name').focus();
		
		document.getElementById('login_send').onclick = function()
		{
			var login_name = document.getElementById('login_name');
			if(login_name.value==null || trim(login_name.value)=='')
				return false;
								
			var b = new zajax();
			b.page = ZITALK_PAGE+"?"+Math.random()+"="+Math.random();
			b.query = "action=login&data="+login_name.value;			
			
			b.onComplete = function(t)
			{			
				if (t == 'false')
				{
					alert(name + " already exist, please choose other name ;)");
					login_name.value = '';
					login_name.focus();
				}
				else
				{
					var zitalk_name = document.getElementById('zitalk_name');
					var zitalk_comment = document.getElementById('zitalk_comment');
					zitalk_name.value = trim(login_name.value);
					onlineUsers();
					
					toogle('block', 'inputs', 'logout');
					toogle('none', 'login');
					zitalk_comment.focus();
					a.close(a);
				}
			};
			b.request();				
		};
};

var logout = function()
{
	var name = document.getElementById('zitalk_name');

	var a = new zajax();
	a.page = ZITALK_PAGE+"?"+Math.random()+"="+Math.random();
	a.query = "action=logout";

	a.onComplete = function()
	{
		name.value='';

		toogle('none','inputs','logout');
		toogle('block','login');

		onlineUsers();
	};
	a.request();
};

var deleteSession = function()
{
	var a = new zajax();
	a.page = ZITALK_PAGE+"?"+Math.random()+"="+Math.random();
	a.query = "action=deleteSession";

	a.request();
};

var tooglesound = function()
{
	var img = document.getElementById('sound');
	var soundtext = document.getElementById('soundtext');
	var comment = document.getElementById('zitalk_comment');
	if(ZITALK_SOUND==true)
	{
		ZITALK_SOUND = false;
		img.src = 'img/soundoff-trans.png';
		img.alt = 'sound off';
	}
	else
	{
		ZITALK_SOUND = true;
		img.src = 'img/soundon-trans.png';
		img.alt = 'sound on';
	}
	comment.focus();
};

var pulse = function(hau,e)
{
	var evt=(e)?e:(window.event)?window.event:null;
	var key=(evt.charCode)?evt.charCode: ((evt.keyCode)?evt.keyCode:((evt.which)?evt.which:0)); 
	var comment = document.getElementById('zitalk_comment');
	if(key==13) // return key
	{
		if(trim(comment.value)=='')
		{
			comment.focus();
			return;
		}
		else
		{
			if(ZITALK_SENDING==true)
				return false;
			else
				write();
			return;
		}
	}
};

var addLoadEvent = function(func)
{
	var oldonload = window.onload;
	if (typeof window.onload != 'function')
		window.onload = func;
	else
	{
		window.onload = function()
		{
			if (oldonload)
				oldonload();
			func();
		}
	}
};

//
// Add events to onload
//
addLoadEvent(function()
{
	if(ZITALK_BROWSER=='msie')
		fixPNG(); // fix png in MSIE
	document.getElementById('zitalk_comment').onkeydown = function(e){pulse(this, e);};
	document.getElementById('sound').onclick = function(){tooglesound();};
	document.getElementById('login').onclick = function(){login();};
	document.getElementById('logout').onclick = function(){logout();};
	document.getElementById('register').onclick = function(){register();};	
	document.getElementById('autoscroll').onclick = function()
	{
		if(ZITALK_AUTOSCROLL===true)	
			ZITALK_AUTOSCROLL = false;
		else
			ZITALK_AUTOSCROLL = true;
	};	

	deleteSession(); // Delete Sessions
	read('0'); // Read last comments in first load
	onlineUsers(); // Read Online Users
	new setIntervals('open');
	// activate sound
	if(ZITALK_SOUND==true)
	{
		soundManager.onload = function()
		{
			soundManager.createSound('bonk','sound/bonk.mp3'); // set sound
			soundManager.setVolume('bonk',100); // set sound volume
		};
	}
});
//
// Javascript trim function, remove spaces right/left
//
function trim(text)
{
	text = text.replace(/^\s+|\st+$/g,'');
	return text;
}
//
// Function to change CSS display by ID 
//
function toogle()
{
	var params = toogle.arguments;
	for(var i=1;i<params.length;i++)
		document.getElementById(params[i]).style.display = params[0];
}
//
// Function to remove All Childs from element
//
function removeAllChilds(a)
{
	while(a.hasChildNodes())
		a.removeChild(a.firstChild);
}
//
// php in_array equivalent
//
function in_array(needle, haystack, strict)
{
	// http://kevin.vanzonneveld.net
	// +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
	// *     example 1: in_array('van', ['Kevin', 'van', 'Zonneveld']);
	// *     returns 1: true
	var found = false, key, strict = !!strict;
	for (key in haystack)
	{
		if ((strict && haystack[key] === needle) || (!strict && haystack[key] == needle))
		{
			found = true;
			break;
		}
	}
	return found;
}

function fixPNG()
{
		var a = document.getElementsByTagName('img');
		var png = /\.png$/i;
		for(var i=0;i<a.length;i++)
			if(png.test(a[i].src))
			{
				a[i].style.filter = 'progid:DXImageTransform.Microsoft.AlphaImageLoader(src=\'' + a[i].src + '\',sizingMethod=\'image\')';
				a[i].src = 'img/trans.gif';
			}
}

function register()
{
		new setIntervals('close');	
		var a = new zmodal();
		a.width = '650';
		a.height = '150';
		a.type = 'html';
		a.title = 'Register';
		a.content = '<p><span>Laster registretie bizango da esan nor zaran ze usuaidxo eta ze password-a gero ez oteko sustorik</span><br /><textarea id="mail"></textarea><br /><input id="send" type="button" value="send" /></p>';
		a.main();	
		a.onClose = function()
		{
			a = null;
			new setIntervals('open');
		};
		document.getElementById('send').onclick = function()
		{
			var b = new zajax();
			b.page = ZITALK_PAGE+"?"+Math.random()+"="+Math.random();
			b.query = "action=mail&data="+encodeURIComponent(document.getElementById('mail').value);

			b.onComplete = function(t)
			{
				alert('Thank you');					
				a.close(a);								
			};
			b.request();			
		};
}

var toScroll = function(ele, type, time)
{	
	if(typeof(time)==='undefined') 
		time = 0;
	
	if(type==='top')
		window.setTimeout(function()
		{
			ele.scrollTop = 1;
		}, time);
	else if(type==='bottom')
		window.setTimeout(function()
		{
			ele.scrollTop = ele.scrollHeight;
		}, time);		
	else if(type>0)
		window.setTimeout(function()
		{
			ele.scrollTop = type;
		}, time);
};

var setIntervals = function(option)
{
	if(option==='open')
	{
		ZITALK_CHATINTERVAL = window.setInterval(function(){lastId()}, ZITALK_REFRESH_RATE); // set chat refresh interval in milisecons
		ZITALK_OUINTERVAL = window.setInterval(function(){onlineUsers()}, ZITALK_REFRESH_RATE_OU); // set online users refresh interval in milisecons				
	}
	else if(option==='close')
	{
		window.clearInterval(ZITALK_CHATINTERVAL);
		window.clearInterval(ZITALK_OUINTERVAL);
	}
};