/**
 * Web OTel bootstrap (TASK-0135).
 *
 * Next.js calls `register()` ONCE per runtime. It runs in the Node.js
 * server runtime (the App Router's RSC/server-action/request path); the
 * edge runtime is NOT used by this app (the middleware is pure cookie
 * gating, no `export const runtime`), so a single guard is sufficient.
 *
 * Same init contract as the API/worker/realtime: `OTEL_ENABLED=true` +
 * `OTEL_EXPORTER_OTLP_ENDPOINT` → export spans/metrics to the collector;
 * otherwise every primitive in `@factory/observability` is a no-op (the
 * package's lazy instruments bind to nothing). OTEL_* are read from
 * process.env directly — the web app has no central env schema to extend.
 */
import { initOtel, shutdownOtel } from "@factory/observability";

export async function register(): Promise<void> {
  if (typeof window !== "undefined") return; // browser bundle — never init here
  const otelEndpoint = process.env.OTEL_EXPORTER_OTLP_ENDPOINT;
  await initOtel({
    serviceName: "factory-web",
    environment: process.env.NODE_ENV,
    ...(process.env.OTEL_ENABLED === "true" && otelEndpoint ? { endpoint: otelEndpoint } : {})
  });

  // Flush on graceful shutdown (Next dev: Ctrl-C / SIGTERM).
  const flush = (): void => {
    shutdownOtel().catch(() => undefined);
  };
  process.on("SIGINT", flush);
  process.on("SIGTERM", flush);
}