const setReferralSourceCookie = () => {
	const referrer = document.referrer;
	const referralID = getCookie('referralId');
	const params = (new URL(document.location)).searchParams;
	const referralVals = ['Paid','Organic','Social','Newsletter','Nexstar Referral','Referral','Direct','Other'];

	// If cookie is set to a valid referral source,
	// refresh its expiration date to one hour from now.
	if (referralVals.includes(referralID)) {
		setCookie('referralId', referralID);
		return;
	}

	let referrerDomain = '';
	if (referrer) {
		referrerDomain = referrer.split('/')[2];
	}

	const utmSource = params.get('utm_source') ?? '';
	const utmMedium = params.get('utm_medium') ?? '';

	const isSocial = 'social' === utmMedium.toLowerCase() || matchesAny(referrerDomain, window.amScripts['ad_referral_source_inline']['socialSites'] || []);
	const isPaid = includesAny(referrer, ['paid.outbrain.com']) || 'capital' === utmSource.toLowerCase() || params.has('gclid');
	const isOrganic = includesAny(referrer, ['google', 'bing', 'yahoo', 'duckduckgo']);
	const notNews = ! referrer.includes('news');
	const isNexstar = includesAny(referrer, window.amScripts["ad_referral_source_inline"]['nxstDomains'] || []);
	const isNewsletter = 'sailthru' === utmSource.toLowerCase();
	const isDirect = 'none' === referrer || '' === referrer;

	if (isPaid) {
		setCookie('referralId', 'Paid');
	} else if (isOrganic && notNews) {
		setCookie('referralId', 'Organic');
	} else if (isSocial) {
		setCookie('referralId', 'Social');
	} else if (isNewsletter) {
		setCookie('referralId', 'Newsletter');
	} else if (isNexstar) {
		setCookie('referralId', 'Nexstar Referral');
	} else if (referrer) {
		setCookie('referralId', 'Referral');
	} else if (isDirect) {
		setCookie('referralId', 'Direct');
	} else {
		setCookie('referralId', 'Other');
	}
}

const matchesAny = (referrer, urls) => {
	if (!urls.length)
		console.error('Social sites are empty for ad-referral-source.');
	for (const url of urls) {
		if (referrer === url) {
			return true;
		}
	}
	return false;
}

const includesAny = (referrer, urls) => {
	if (!urls.length)
		console.error('Nexstar domains are empty for ad-referral-source.');
	for (const url of urls) {
		if ('' !== url && referrer.includes(url)) {
			return true;
		}
	}
	return false;
}
setReferralSourceCookie()