Analytics for Sentry

// Sentry webhook → correlate with BetterMeter traffic
// siteId is the Site id from your BetterMeter dashboard, not the domain.
const SITE_ID = "clx8k2p0a0001qw3f7h2n9d4e";
const day = (d: Date) => d.toISOString().slice(0, 10); // YYYY-MM-DD

export async function handleSentryAlert(alert: SentryAlert) {
  // Traffic is reported per calendar day, so compare the alert's day
  // against the week before it rather than the hour before it.
  const alertDay = new Date(alert.triggeredAt);
  const weekBefore = new Date(alertDay.getTime() - 7 * 24 * 60 * 60 * 1000);
  const query = `siteId=${SITE_ID}&from=${day(weekBefore)}&to=${day(alertDay)}`;
  const headers = { Authorization: `Bearer ${process.env.BETTERMETER_API_KEY}` };

  const [seriesRes, aiRes] = await Promise.all([
    fetch(`https://bettermeter.com/api/analytics/timeseries?${query}`, { headers }),
    fetch(`https://bettermeter.com/api/analytics/ai-traffic?${query}`, { headers }),
  ]);

  // [{ date: "2026-01-05", visitors, pageviews }] — one point per day, gaps filled with zeroes
  const series = await seriesRes.json();
  // { totalAiVisitors, totalVisitors, aiPercentage, byPlatform: [{ platform, visitors, pageviews }] }
  const ai = await aiRes.json();

  const alertDayVisitors = series.at(-1)?.visitors ?? 0;
  const baseline = series.slice(0, -1);
  const avgVisitors = baseline.reduce((s, d) => s + d.visitors, 0) / (baseline.length || 1);

  return {
    errorCount: alert.count,
    trafficCorrelation: alertDayVisitors > avgVisitors * 1.5
      ? "Traffic spike that day — errors likely load-related"
      : "Traffic in line with the baseline — errors likely code-related",
    aiVisitorPercent: ai.aiPercentage,
    topAiPlatforms: ai.byPlatform.slice(0, 3),
  };
}