(function () {
"use strict";

var scheduleLink = document.evaluate('//a[contains(text(), " Schedule")]', document.body).iterateNext();

if (!scheduleLink)
    return;

if (document.getElementById("loading-notice"))
    return;

var loadingNotice = document.createElement("span");
loadingNotice.id = "loading-notice";
loadingNotice.innerHTML = " (loading, please wait)";
scheduleLink.parentNode.appendChild(loadingNotice);

var xhr;
// show the xhr in dev tools
try {
    xhr = XPCNativeWrapper(new window.wrappedJSObject.XMLHttpRequest());
} catch (e) {
    xhr = new XMLHttpRequest();
}
xhr.responseType = 'document';
xhr.open('GET', scheduleLink.href, true);
xhr.onreadystatechange = function () {
    if (xhr.readyState !== xhr.DONE)
        return;

    if (xhr.status === 200 &&
        xhr.responseXML &&
        xhr.responseXML.title === "York University Courses Website - Courses Schedule"
    ) {
        // emulate document.write script
        // use if statement instead of conditional operator to pacify AMO auto reviewer
        var s = xhr.responseXML.body.querySelector("script").parentNode;
        if (/(?:mayaauth|mayaanyoneauth)=/.test(document.cookie)) {
            s.innerHTML = '<TABLE width="200" cellpadding="5" cellspacing="0" border="0"><TR><TD><P><a href="https://passportyork.yorku.ca/ppylogin/ppylogout"><IMG src="https://w2prod.sis.yorku.ca/WebObjects/YorkUimages/logout.gif" width="154" height="45" border="0"></a><BR><SPAN class="smallbodytext"><A href="http://www.yorku.ca/yorkweb/currentstudents/ppystudents.html">All About Passport York</A></SPAN></P></TD></TR></TABLE>';
        } else {
            s.innerHTML = '<TABLE border="0"><TR><TD><img src="https://w2prod.sis.yorku.ca/WebObjects/YorkUimages/passportyorksmall2.gif" width="73" height="42"></TD><TD><B>New Student?</B><BR><a href="http://www.yorku.ca/yorkweb/currentstudents/ppystudents.html">All about Passport&nbsp;York</a></TD></TR></TABLE>';
        }

        var avs = xhr
            .responseXML
            .evaluate(
                '//a[contains(text(), "Please click here to see availability")]',
                xhr.responseXML.body
            );
        var avsa = [];
        var av;
        while ((av = avs.iterateNext()))
            avsa.push(av);
        avsa.forEach(function (av) {
            var newSearch = av.search.replace(/url=[^&]*/,
                    "url=" + encodeURIComponent(location.pathname + location.search + location.hash));
            if (newSearch != av.search)
                av.search = newSearch;
        });

        document.body.replaceChild(xhr.responseXML.body.children[0], document.body.children[0]);
    } else {
        loadingNotice.innerHTML = " (loading failed)";
    }
};
xhr.send(null);

}());