/**
 * Connects to /ws/telemetry as a user and prints what arrives, then exits.
 *
 * Exists for scripts/e2e-edge.sh, which can then assert on real frames from
 * the real route rather than on a mirrored composition in a unit test. Also
 * useful by hand: it is the quickest way to see whether a farm's telemetry is
 * actually reaching a console.
 *
 * Usage: bun scripts/watch-telemetry.ts <ws-base> <access-token> [seconds]
 */
const [base, token, secondsArg] = process.argv.slice(2);
if (!base || !token) {
  console.error("usage: watch-telemetry.ts <ws-base> <access-token> [seconds]");
  process.exit(2);
}
const seconds = Number(secondsArg ?? 15);

// The token goes in the subprotocol, not the URL - a browser cannot set
// headers, and a query parameter would put a bearer credential in every
// access log. "bearer" first: the server echoes the first offered value back,
// and the token must not be what comes back.
const ws = new WebSocket(`${base}/ws/telemetry`, ["bearer", token]);

const frames: unknown[] = [];
ws.onmessage = (event) => {
  frames.push(typeof event.data === "string" ? JSON.parse(event.data) : event.data);
};
ws.onerror = () => {
  console.error("REFUSED: the socket would not open");
  process.exit(1);
};

setTimeout(() => {
  // Printed as one JSON document so the caller can parse it rather than
  // scraping log lines.
  console.log(JSON.stringify({ negotiated: ws.protocol, frames }, null, 2));
  process.exit(0);
}, seconds * 1000);