import { NextResponse } from "next/server";
import { renderPrometheus } from "@factory/observability";

// TASK-0135 — Prometheus scrape target for the web service
// (`factory-web`): `target_info` + whatever the web process emits.
// 204 when OTel is disabled (no provider) or the render fails — the scrape
// target exists either way, same contract as the API's /metrics.
// Unauthenticated by design (documented exception to the global guard);
// exposes no tenant data — only OTel resource labels + counters.

export const dynamic = "force-dynamic";

export async function GET() {
  const body = await renderPrometheus().catch(() => "");
  if (!body) {
    return new NextResponse(null, { status: 204 });
  }
  return new NextResponse(body, {
    status: 200,
    headers: { "content-type": "text/plain; version=0.0.4; charset=utf-8" }
  });
}