webshell={};
webshell.TerminalClass=function(id,width,height,handler) {
	var ie=0;
	if(window.ActiveXObject)
		ie=1;
	var sid=""+Math.round(Math.random()*1000000000);
	var qs="s="+sid+"&w="+width+"&h="+height+"&k=";
	var kb=[];
	var isactive=false;
	var islocked=false;
	var qtimer;
	var qtime=100;
	var retry=0;
	var cy=0;
	var div=document.getElementById(id);

	function update() {
		if(!islocked) {
			islocked=true;
			if (ie==1)
				var r=new ActiveXObject("Microsoft.XMLHTTP");
			else
				var r=new XMLHttpRequest();
			var send="";
			while(kb.length>0)
				send+=kb.pop();
			r.open("GET","u?"+qs+send,true);
			if(ie)
				r.setRequestHeader("If-Modified-Since", "Sat, 1 Jan 2000 00:00:00 GMT");
			r.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
			r.onreadystatechange=function() {
				if(r.readyState!=4)
					return;
				islocked=false;
				if (!isactive) {
					isactive=true;
					handler('conn',0);
				}
				if(r.status==200) {
					retry=0;
					cy=r.responseText.substring(45,48);
					html=r.responseText.substring(52);
					if(html.length>0) {
						div.innerHTML=html;
						handler('curs',cy);
						qtime=100;
					} else {
						qtime*=2;
						if(qtime>2000)
							qtime=2000;
					}
					qtimer=window.setTimeout(update,qtime);
				} else if (r.status==400)
					handler('disc',0);
				else {
					retry++;
					if (retry<3)
						qtimer=window.setTimeout(update,2000);
					else
						handler('disc',1);
				}
			}
			r.send(null);
		}
	}
	function queue(s) {
		kb.unshift(s);
		qtime=100;
		if(!islocked) {
			window.clearTimeout(qtimer);
			qtimer=window.setTimeout(update,1);
		}
	}
	function private_sendkey(kc) {
		var k="";
		// Build character
		switch(kc) {
		case 126:k="~~";break;
		case 63232:k="~A";break;// Up
		case 63233:k="~B";break;// Down
		case 63234:k="~D";break;// Left
		case 63235:k="~C";break;// Right
		case 63276:k="~1";break;// PgUp
		case 63277:k="~2";break;// PgDn
		case 63273:k="~H";break;// Home
		case 63275:k="~F";break;// End
		case 63302:k="~3";break;// Ins
		case 63272:k="~4";break;// Del
		case 63236:k="~a";break;// F1
		case 63237:k="~b";break;// F2
		case 63238:k="~c";break;// F3
		case 63239:k="~d";break;// F4
		case 63240:k="~e";break;// F5
		case 63241:k="~f";break;// F6
		case 63242:k="~g";break;// F7
		case 63243:k="~h";break;// F8
		case 63244:k="~i";break;// F9
		case 63245:k="~j";break;// F10
		case 63246:k="~k";break;// F11
		case 63247:k="~l";break;// F12
		default:k=String.fromCharCode(kc);
		}
		queue(encodeURIComponent(k));
	};
	this.sendkey = function(kc) {
		private_sendkey(kc);
	}
	this.keypress = function(ev) {
		// Translate to standard keycodes
		if (!ev) var ev=window.event;
		var kc;
//alert('kc:'+ev.keyCode+' which:'+ev.which+' ctrlKey:'+ev.ctrlKey);
		if (ev.keyCode) kc=ev.keyCode;
		if (ev.which) kc=ev.which;
		if (ev.ctrlKey) {
			if (kc>=0 && kc<=32) kc=kc;
			else if (kc>=65 && kc<=90) kc-=64;
			else if (kc>=97 && kc<=122) kc-=96;
			else {
				switch (kc) {
				case 54:kc=30;break;	// Ctrl-^
				case 109:kc=31;break;	// Ctrl-_
				case 219:kc=27;break;	// Ctrl-[
				case 220:kc=28;break;	// Ctrl-\
				case 221:kc=29;break;	// Ctrl-]
				default: return true;
				}
			}
		} else if (ev.which==0) {
			switch(kc) {
			case 8: break;			// Backspace
			case 27: break;			// ESC
			case 33:kc=63276;break;	// PgUp
			case 34:kc=63277;break;	// PgDn
			case 35:kc=63275;break;	// End
			case 36:kc=63273;break;	// Home
			case 37:kc=63234;break;	// Left
			case 38:kc=63232;break;	// Up
			case 39:kc=63235;break;	// Right
			case 40:kc=63233;break;	// Down
			case 45:kc=63302;break;	// Ins
			case 46:kc=63272;break;	// Del
			case 112:kc=63236;break;// F1
			case 113:kc=63237;break;// F2
			case 114:kc=63238;break;// F3
			case 115:kc=63239;break;// F4
			case 116:kc=63240;break;// F5
			case 117:kc=63241;break;// F6
			case 118:kc=63242;break;// F7
			case 119:kc=63243;break;// F8
			case 120:kc=63244;break;// F9
			case 121:kc=63245;break;// F10
			case 122:kc=63246;break;// F11
			case 123:kc=63247;break;// F12
			default: return true;
			}
		}
		if(kc==8) kc=127;
		private_sendkey(kc);
		
		ev.cancelBubble=true;
		if (ev.stopPropagation) ev.stopPropagation();
		if (ev.preventDefault) ev.preventDefault();

		return true;
	}
	this.keydown = function(ev) {
		if (!ev) var ev=window.event;
		if (ie) {
			o={9:1,8:1,27:1,33:1,34:1,35:1,36:1,37:1,38:1,39:1,40:1,45:1,46:1,112:1,
				113:1,114:1,115:1,116:1,117:1,118:1,119:1,120:1,121:1,122:1,123:1};
			if (o[ev.keyCode] || ev.ctrlKey || ev.altKey) {
				ev.which=0;
				return keypress(ev);
			}
		}
	}
	qtimer=window.setTimeout(update,1);
}
webshell.Terminal=function(id,width,height,handler) {
	return new this.TerminalClass(id,width,height,handler);
}