/**
 * Imperative shell for page view analytics: sends one page view to the
 * Umami collection API, identifying the visitor via request headers.
 * Fire-and-forget by design — analytics must never delay a response.
 */

import type { PageviewFacts } from "@/src/domain/pageview-decision";
import { buildUmamiPageviewBody } from "@/src/domain/umami-payload";

const SEND_TIMEOUT_MS = 3_000;

const websiteId = process.env.UMAMI_WEBSITE_ID ?? "";
const apiEndpoint = (process.env.UMAMI_API_ENDPOINT ?? "").replace(/\/+$/, "");

export function recordPageviewToUmami(facts: PageviewFacts): void {
  if (!websiteId || !apiEndpoint) return;

  const body = buildUmamiPageviewBody(facts, websiteId);

  void fetch(`${apiEndpoint}/api/send`, {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
      "User-Agent": facts.userAgent,
      "X-Forwarded-For": facts.clientIp,
      "Accept-Language": facts.language,
    },
    body: JSON.stringify(body),
    signal: AbortSignal.timeout(SEND_TIMEOUT_MS),
  }).catch((error: unknown) => {
    console.error("umami pageview send failed", {
      url: facts.url,
      error: error instanceof Error ? error.message : String(error),
    });
  });
}