(function () {
var COOKIE = 'rsm_attr'; // first-party, this domain only
var DAYS = 90; // matches the usual Google Ads attribution window
var MAX = 300; // per-value cap; cookies ride on every request, keep it small
try {
var qs = new URLSearchParams(location.search);
var clip = function (v) { return v == null ? '' : String(v).slice(0, MAX); };
// A "campaign touch" = any paid/tagged arrival. Plain organic navigation must not overwrite.
var CLICK = ['gclid', 'gbraid', 'wbraid', 'fbclid', 'msclkid', 'ttclid'];
var UTM = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content'];
// Google Ads ValueTrack, delivered via a Final URL suffix on standard Search campaigns.
// `keyword` + `matchtype` are the useful pair: which search actually produced a booking.
var VT = ['keyword', 'matchtype', 'device', 'network', 'campaignid', 'adgroupid', 'placement'];
var touch = {};
CLICK.concat(UTM, VT).forEach(function (k) { if (qs.get(k)) touch[k] = clip(qs.get(k)); });
// ValueTrack alone doesn't mark a campaign touch — a stray ?device= shouldn't overwrite a real
// ad click's first-touch record. Only a click id or a utm_* counts.
var isCampaignTouch = CLICK.concat(UTM).some(function (k) { return !!touch[k]; });
// Referrer is only meaningful when it's off-site.
var ref = '';
try {
if (document.referrer && new URL(document.referrer).hostname !== location.hostname) {
ref = clip(document.referrer);
}
} catch (e) {}
var existing = null;
try {
var m = document.cookie.match(new RegExp('(?:^|; )' + COOKIE + '=([^;]*)'));
if (m) existing = JSON.parse(decodeURIComponent(m[1]));
} catch (e) { existing = null; }
// Nothing new to record and we already have a record ? leave it alone.
if (!isCampaignTouch && !ref && existing) return;
var now = new Date().toISOString();
var landing = clip(location.pathname + location.search);
var data = existing || {};
if (!data.ft) { // FIRST touch — write once, never overwrite
data.ft = { t: now, ref: ref, landing: landing };
CLICK.concat(UTM, VT).forEach(function (k) { if (touch[k]) data.ft[k] = touch[k]; });
}
if (isCampaignTouch || !data.lt) { // LAST touch — refresh on each new campaign hit
data.lt = { t: now, ref: ref, landing: landing };
CLICK.concat(UTM, VT).forEach(function (k) { if (touch[k]) data.lt[k] = touch[k]; });
}
var val = encodeURIComponent(JSON.stringify(data));
if (val.length > 3500) return; // never risk blowing the 4KB cookie limit
document.cookie = COOKIE + '=' + val + ';path=/;max-age=' + (DAYS * 86400) +
';SameSite=Lax' + (location.protocol === 'https:' ? ';Secure' : '');
} catch (e) { /* attribution is never worth breaking a page for */ }
})();