// $Id$

var it_boot_status = "boot";
var it_panictimer = window.setTimeout("it_panic(it_boot_status)", 31337);
var it_catcherrstart = new Date().getTime();

function it_catcherr(msg, url, line)
{
	var stacktrace = "";

	for (var c = it_catcherr.caller; c != null; c = c.caller)
	{
		var funcname = c.toString().match(/function (\w*)/)[1];
		stacktrace += (funcname ? funcname : "anon") + "/";

		if (c.caller == c)	// Break simple recursion
		{
			stacktrace += "*";
			break;
		}
	}

	it_boot_report(msg, url, line, stacktrace);

	return !window.env || !!window.env.is_live_server;	// No env or live server -> suppress error
}

window.onerror = it_catcherr;

function it_boot_addparam(url, param)
{
	return url + (url.match(/\?/) ? "&" : "?") + param;
}

function it_panic(msg)
{
	if (!document.location.href.match(/[?&]static=/))	// Avoid loop
		window.setTimeout("document.location.href = it_boot_addparam(document.location.href, 'static=" + msg + "')", 500);

	return it_catcherr('panic ' + msg, '-', -1);
}


function it_boot_report(msg, file, line, error)
{
	window.clearTimeout(window.it_domtimer);
	window.clearTimeout(window.it_panictimer);

	new Image().src = "/itjs/error.gif/" + escape(msg) + "|" + escape(file) + "|" + line + "|" + (new Date().getTime() - it_catcherrstart) + "|" + escape(error);
}

function it_boot_checkcss(style, key, value)
{
	return navigator.userAgent.match(/konqueror/i) || (style && style.getPropertyValue && (style.getPropertyValue(key) == value));
}

function it_boot_init()
{
	window.it_domtimer = null;
	var konqueror = navigator.userAgent.match(/konqueror/i);
	var doc = document;
	var dom = doc && (dom = doc.getElementById('it_boot_dom'));	// HTML has been rendered
	var view = dom && doc.defaultView;	// We can check if stylesheet is active
	var style = view && view.getComputedStyle && view.getComputedStyle(dom, '');
	var css = window.it_boot_checkcss(style, "visibility", "hidden"); // CSS active (inline style on tag)
	var stylesheet = window.it_boot_checkcss(style, "display", "none");	// External stylesheet loaded

	if (!(doc || !(it_boot_status = "doc")) || !(dom || !(it_boot_status = "dom")) || (style && !(stylesheet || !(it_boot_status = "stylesheet"))))
	{
		window.it_domtimer = window.setTimeout("it_boot_init()" , 42);

		if (style && !css)
			it_panic("css");

		return;
	}

	window.clearTimeout(window.it_panictimer); 
	window.it_boot_start();
}

function it_boot(file, isretry)
{
	try
	{
		var loader = new XMLHttpRequest();
	}
	catch (e)
	{
		var classnames = [ 'MSXML2.XMLHTTP', 'Microsoft.XMLHTTP' ];

		for (var i in classnames)
			try { loader = new ActiveXObject(classnames[i]); break; } catch (e) {}
	}

	if (loader)
	{
		loader.open("GET", it_boot_addparam(file, "boot=1" + (isretry ? "&retry=1" : "")));
		loader.onreadystatechange = function()
		{
			var error = "";

			if (loader.readyState == 4)
			{
				if (loader.status < 400)	// Opera gives back 304 if from cache
				{
					try
					{
						var data = eval("(" + loader.responseText + ")");

						if (data.code.length == data.len)
						{
							var code = "try {" + data.code + "} catch (e) { it_boot_report('Load error', '-', -1, e); };window.it_boot_init()";	// Wrapped in try/catch as Konqueror does not support window.onerror
							isretry = true;	// No further retry after this point

							if (window.execScript)
								window.execScript(code, "javascript");	// IE work-around to get script executed in global scope
							else
								window.setTimeout(code, 0);	// Standard compliant version
						}
						else
							error = "Length mismatch " + data.code.length + " != " + data.len;
					}
					catch (e)
					{
						for (i in e)
							error += i + "=" + e[i] + ";";
					}
				}
				else
					error = loader.statusText;

				if (error)
				{
					if (isretry)
						it_boot_report('Load error on retry', file, -1, error);
					else
						it_boot(file, true);
				}
			}
		}
		loader.send(null);
	}
	else
	{
		var doc = document;
		var dom = doc && (dom = doc.getElementById('it_boot_dom'));	// HTML has been rendered

		if (window.opera)
			document.write('<sc'+'ript type="text/javascript" src="'+it_boot_addparam(file, 'init=1')+'"><\/sc'+'ript>');
		else if (dom)
		{
			var tag = doc.createElement("script");
			tag.src = it_boot_addparam(file, 'init=1');
			dom.appendChild(tag);
		}
		else
			window.it_domtimer = window.setTimeout("it_boot('" + file + "')" , 42);
	}
}