Note: After saving, you have to bypass your browser's cache to see the changes. Google Chrome, Firefox, Microsoft Edge and Safari: Hold down the ⇧ Shift key and click the Reload toolbar button. For details and instructions about other browsers, see Wikipedia:Bypass your cache.
$.when(mw.loader.using(['mediawiki.util', 'mediawiki.api']), $.ready).done(function () {
    if (mw.config.get("wgNamespaceNumber") % 2 == 0 && mw.config.get("wgNamespaceNumber") != 4)
        // not a talk page and not project namespace
        return;
    if (mw.config.get("wgNamespaceNumber") == -1)
        // is a special page
        return;
    $("head").append("<style>a.arkylink { font-weight:bold } .arkyhighlight { background-color:#D9E9FF }</style>");
    let validSections = new Object();
    let fromTos = new Object();
    let wikiText = "";
    let revStamp;
    let startArchiveButton = mw.util.addPortletLink("p-cactions", "#", "ØCA", "pt-oeca", "Enter/exit the archival process", null, null);
    let overlay = $(document.createElement("button"));
    $(startArchiveButton).click(function (e) {
        $(".arkylink").click();
        $(".arky").toggle();
        $("#archivebutton").toggle();
    });
    overlay.html("archive all the selected threads")
        .attr("id", 'archivebutton')
        .css("position", 'sticky')
        .css("bottom", 0)
        .css("width", '100%')
        .css("font-size", '200%');
    $(document.body).append(overlay);
    overlay.toggle();
    overlay.click(function (e) {
        let numOfThreads, archiveTarget;
        let sections, archiveThis;
        let cutOffset, revisedPage;

        function cut(s, start, end) {
            return s.substr(0, start) + s.substring(end);
        }
        cutOffset = numOfThreads = 0;
        revisedPage = wikiText;
        sections = $("a.arkylink").map(function () {
            return $(this).attr("data-section");
        });
        if (!(numOfThreads = sections.length))
            return alert("No threads selected, aborting");


        let reqRevs = {
            action: "query",
            titles: mw.config.get('wgPageName'),
            rvsection: 0,
            prop: "revisions|info",
            rvprop: "content",
            indexpageids: 1,
            dataType: "xml",
            format: "xml"
        };

        $.get(mw.config.get("wgScriptPath") + "/api.php", reqRevs, function (respRevs) {

            let content = $(respRevs).find('rev').text();
            let reCounter = new RegExp(/\| ?counter|numberstart ?= ?(?<counter>\d+)/, 'i');
            let rePrefix = new RegExp(/\| ?archiveprefix ?= ?(?<prefix>.+?)(\n|\|)/, 'i');
            let counter = reCounter.exec(content);

            if ((counter == null) || (typeof counter == 'undefined')) {
                console.debug('Could not find counter');
                archiveTarget = prompt("Archiving " + numOfThreads + " threads: where should we move them to? (e.g. Wikipedia:Sandbox/Archive 1)", mw.config.get("wgPageName"));
            } else {
                console.debug('Found counter');
                let archiveNum = counter.groups.counter;
                let prefix = rePrefix.exec(content);

                if ((prefix == null) || (typeof prefix == 'undefined')) {
                    console.debug('Could not find prefix');
                    archiveTarget = prompt(
                        "Archiving " + numOfThreads + " threads.\n" +
                        "Automatically found counter.\n" +
                        "Please confirm...",
                        mw.config.get("wgPageName") + '/Archive ' + archiveNum
                    );
                } else {
                    console.debug('Found prefix');
                    let archivePrefix = prefix.groups.prefix;
                    archiveTarget = prompt(
                        "Archiving " + numOfThreads + " threads.\n" +
                        "Automatically found prefix and counter.\n" +
                        "Please confirm...",
                        archivePrefix + ' ' + archiveNum
                    );
                }
            }

            if (!archiveTarget || archiveTarget == mw.config.get("wgPageName"))
                return alert("No archive target selected, aborting");
            sections.each(function (i, n) {
                revisedPage = cut(
                    revisedPage,
                    fromTos[n][0] - cutOffset,
                    fromTos[n][1] - cutOffset
                );
                cutOffset += fromTos[n][1] - fromTos[n][0];
            });
            archiveThis = sections.map(function () {
                return wikiText.substring(fromTos[this][0], fromTos[this][1]);
            }).toArray().join("");
            console.log("archive this:" + archiveThis);
            console.log("revised page:" + revisedPage);
            if (1) new mw.Api().postWithToken("csrf", {
                    action: 'edit',
                    title: mw.config.get("wgPageName"),
                    text: revisedPage,
                    summary: "Removed " + numOfThreads + " threads to [[" + archiveTarget + "]] using [[User:TheresNoTime/Archiver.js|script]]",
                    basetimestamp: revStamp,
                    starttimestamp: revStamp
                })
                .done(function (res1) {
                    alert("Successfully removed threads from talk page");
                    console.log(res1);
                    new mw.Api().postWithToken("csrf", {
                            action: 'edit',
                            title: archiveTarget,
                            appendtext: "\n" + archiveThis,
                            summary: "Added threads from [[" + mw.config.get("wgPageName") + "]] using [[User:TheresNoTime/Archiver.js|script]]"
                        })
                        .done(function (res2) {
                            alert("Successfully added threads to archive page");
                        })
                        .fail(function (res2) {
                            alert("failed to add threads to archive page. manual inspection needed.");
                        })
                        .always(function (res2) {
                            console.log(res2);
                            window.location.reload();
                        });
                })
                .fail(function (res1) {
                    alert("failed to remove threads from talk page. aborting archive process.");
                    console.log(res1);
                    window.location.reload();
                });
        });
    });
    new mw.Api().get({
        action: 'parse',
        page: mw.config.get("wgPageName")
    }).done(function (dataShit) {
        new mw.Api().get({
            action: 'query',
            pageids: mw.config.get("wgArticleId"),
            prop: ['revisions'],
            rvprop: ['content', 'timestamp']
        }).done(function (shit) {
            let rv;
            rv = shit.query.pages[mw.config.get("wgArticleId")].revisions[0];
            wikiText = rv["*"];
            revStamp = rv['timestamp'];
        });
        $(dataShit.parse.sections)
            .filter(function (i, s) {
                return s.index == parseInt(s.index)
            })
            .each(function (i, s) {
                validSections[s.index] = s
            });
        for (let i in validSections) {
            i = parseInt(i);
            fromTos[i] = [
                validSections[i].byteoffset,
                validSections.hasOwnProperty(i + 1) ? validSections[i + 1].byteoffset : Infinity
            ];
        }
        $("#mw-content-text").find(":header").find("span.mw-headline").each(function (i, title) {
            let header, headerNum, editSection, sectionNumber;
            header = $(this).parent();
            headerNum = header.prop("tagName").substr(1, 1) * 1; // wtf javascript
            editSection = header.find(".mw-editsection"); // 1st child
            sectionNumber = header.find(".mw-editsection a:last");
            if (sectionNumber[0]) {
                // Note: href may not be set.
                sectionNumber = sectionNumber.attr("href") && sectionNumber.attr("href").match(/&section=(\d+)/);
                if (sectionNumber)
                    sectionNumber = sectionNumber[1];
            } else // eg <h2>not a real section</h2>
                sectionNumber = undefined;
            if (validSections.hasOwnProperty(sectionNumber))
                editSection[0].innerHTML += "&nbsp;<span class=arky style=display:none><span class=mw-editsection-bracket>[</span><a data-header=" + headerNum + " " + "data-section=" + sectionNumber + " " + "onclick='$(this).closest(\":header\").toggleClass(\"arkyhighlight\");$(this).toggleClass(\"arkylink\");let archivable = $(\".arky a\"); for(let i=archivable.index(this); i<archivable.length; ++i) { if (archivable[i] == this) { continue; } if ($(archivable[i]).attr(\"data-header\") > " + headerNum + " && $(archivable[i]).hasClass(\"arkylink\") != $(this).hasClass(\"arkylink\")) { $(archivable[i]).click(); } else { break; } }'>archive</a><span class=mw-editsection-bracket>]</span></span>";
        });
    });
});