var potTrimite = true;
var mesajTrimis = "";
var updateInProgress = false;

// Removes leading whitespaces
function LTrim( value ) {
	var re = /\s*((\S+\s*)*)/;
	return value.replace(re, "$1");
}

// Removes ending whitespaces
function RTrim( value ) {
	var re = /((\s*\S+)*)\s*/;
	return value.replace(re, "$1");
}

// Removes leading and ending whitespaces
function trim( value ) {	
	return LTrim(RTrim(value));
}


function trimiteMesaj(){
	if (potTrimite == false) {
		//alert('Nu puteti trimite mesaje pana nu se actualizeaza pagina!');
		setTimeout("trimiteMesaj()",500);
		return;
	}

	xmlHttp = GetXmlHttpObject()
	if (xmlHttp==null)
	{
		alert ("Browserul tau nu suporta AJAX! Nu poti folosi chatul :(");
		return;
	}
	
	if (elem = document.getElementById('inputmesaj')){ 
		mesajTrimis = elem.value;
		mesajTrimis = trim(mesajTrimis);
		elem.value = "";
	}else {
		alert("Eroare javascript!");
		return;
	}
	
	if (mesajTrimis == "") {
		alert('Nu puteti trimite mesaje goale!');
		return;
	}
	
	var url = 'chatscript.php';
	url = url + '?mesaj=' + Base64.encode(mesajTrimis);


	// afisam casuta de raspuns
	
	xmlHttp.onreadystatechange=trimiteMesajStatus;
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
}

function trimiteMesajStatus(){
	if (elem = document.getElementById('loadingimg')){ elem.style.display = "inline" ;}
	if (xmlHttp.readyState == 4) { 
		mesaj = "" + xmlHttp.responseText ;
		if (mesaj != 'ok'){ 
			// afisam eroarea in caz in care exista
			alert(mesaj);
		} else {
			mesajTrimis = '';
		}

		if (elem = document.getElementById('inputmesaj')){ elem.value = mesajTrimis; }
		if (elem = document.getElementById('loadingimg')){ elem.style.display = "none" ;}	// ascundem loading-ul

		// apelam refresh-ul
		updateChat();
	}
}

function updateChat(){
	if (updateInProgress == true) {
		// exista deja un alt update care ruleaza in background
		//return;
	}else{
		updateInProgress = true;
		potTrimite = false;

		xmlHttp = GetXmlHttpObject()
		if (xmlHttp==null)
		{
			alert ("Browserul tau nu suporta AJAX! Nu poti folosi chatul :(");
			return;
		}
	
		var url = 'chatscript.php?update=';
		data = new Date(); // anticache
		url = url + data.getTime();
	
		xmlHttp.onreadystatechange= updateChatStatus;
		xmlHttp.open("GET",url,true);
		xmlHttp.send(null);
	}
}


function updateChatStatus(){
	// afisam loading
	if (elem = document.getElementById('loadingimg')){ elem.style.display = "inline" ;}

	if (xmlHttp.readyState == 4) { 
		mesaj = "" + xmlHttp.responseText ;

		//alert(mesaj);
		// verificam daca s-au returnat mesaje noi, sau 0
		if (mesaj != 0){
			if (elem = document.getElementById('chatbox')) {
				// stergem "loading..." pentru primul update
				//if (elem.innerHTML == 'loading...') { elem.innerHTML = '';}

				// adaugam mesajele noi in box
				//elem.innerHTML = elem.innerHTML + mesaj;
				elem.innerHTML = mesaj;
				if ( at = document.getElementById('autoscroll')) {
					if ( at.checked == true ){
					elem.scrollTop = elem.scrollHeight; }
				}
			}else{
				alert("Eroare javascript la refresh-ul chatului!");		
			}

		}else{
			//confirm(mesaj);
		}

		// ascundem loading-ul
		if (elem = document.getElementById('loadingimg')){ elem.style.display = "none" ;}	// ascundem loading-ul

		updateInProgress = false;
		potTrimite = true;
	}
}

function chatAutoRefresh(speed) {
	updateChat();
	setTimeout('chatAutoRefresh('+speed+')',speed);
}


function callUser(nume){
	ibox = document.getElementById('inputmesaj');
	if (ibox){
		if ((ibox.value == 'scrie mesajul tau aici...')||(ibox.value == '')) {
			ibox.value = '@' + nume + ': '; }
		else{
			ibox.value = ibox.value +' @ '+nume + ': '; }	
		ibox.focus();
	}
	else {
		alert ("Eroare minora javascript. Te rugam sa contactezi administratorul!");
	}
}



/**
*
*  Base64 encode / decode
*  http://www.webtoolkit.info/
*
**/

var Base64 = {

	// private property
	_keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",

	// public method for encoding
	encode : function (input) {
		var output = "";
		var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
		var i = 0;

		input = Base64._utf8_encode(input);

		while (i < input.length ) {

			chr1 = input.charCodeAt(i++);
			chr2 = input.charCodeAt(i++);
			chr3 = input.charCodeAt(i++);

			enc1 = chr1 >> 2;
			enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
			enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
			enc4 = chr3 & 63;

			if (isNaN(chr2)) {
				enc3 = enc4 = 64;
			} else if (isNaN(chr3)) {
				enc4 = 64;
			}

			output = output +
			this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
			this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);

		}

		return output;
	},

	// public method for decoding
	decode : function (input) {
		var output = "";
		var chr1, chr2, chr3;
		var enc1, enc2, enc3, enc4;
		var i = 0;

		input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

		while (i < input.length) {

			enc1 = this._keyStr.indexOf(input.charAt(i++));
			enc2 = this._keyStr.indexOf(input.charAt(i++));
			enc3 = this._keyStr.indexOf(input.charAt(i++));
			enc4 = this._keyStr.indexOf(input.charAt(i++));

			chr1 = (enc1 << 2) | (enc2 >> 4);
			chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
			chr3 = ((enc3 & 3) << 6) | enc4;

			output = output + String.fromCharCode(chr1);

			if (enc3 != 64) {
				output = output + String.fromCharCode(chr2);
			}
			if (enc4 != 64) {
				output = output + String.fromCharCode(chr3);
			}

		}

		output = Base64._utf8_decode(output);

		return output;

	},

	// private method for UTF-8 encoding
	_utf8_encode : function (string) {
		string = string.replace(/\r\n/g,"\n");
		var utftext = "";

		for (var n = 0; n < string.length; n++) {

			var c = string.charCodeAt(n);

			if (c < 128) {
				utftext += String.fromCharCode(c);
			}
			else if((c > 127) && (c < 2048)) {
				utftext += String.fromCharCode((c >> 6) | 192);
				utftext += String.fromCharCode((c & 63) | 128);
			}
			else {
				utftext += String.fromCharCode((c >> 12) | 224);
				utftext += String.fromCharCode(((c >> 6) & 63) | 128);
				utftext += String.fromCharCode((c & 63) | 128);
			}

		}

		return utftext;
	},

	// private method for UTF-8 decoding
	_utf8_decode : function (utftext) {
		var string = "";
		var i = 0;
		var c = c1 = c2 = 0;

		while ( i < utftext.length ) {

			c = utftext.charCodeAt(i);

			if (c < 128) {
				string += String.fromCharCode(c);
				i++;
			}
			else if((c > 191) && (c < 224)) {
				c2 = utftext.charCodeAt(i+1);
				string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
				i += 2;
			}
			else {
				c2 = utftext.charCodeAt(i+1);
				c3 = utftext.charCodeAt(i+2);
				string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
				i += 3;
			}

		}

		return string;
	}

}