frontend/src/lib/traces.ts

// Ship trace records to the daemon at Night Bloom. Daemon down is normal
// (Space/demo mode) — buffer in localStorage and retry at the next sleep,
// so no day's labels are lost to a napping daemon.

import type { TraceRecord } from "../engine";

const BUFFER_KEY = "puck:trace-buffer";

export async function exportTraces(records: TraceRecord[]): Promise<void> {
  let buffered: TraceRecord[] = [];
  try {
    buffered = JSON.parse(localStorage.getItem(BUFFER_KEY) ?? "[]");
  } catch (e) {
    console.error("puck: corrupt trace buffer, dropping it", e);
  }
  const all = [...buffered, ...records];
  if (!all.length) return;

  try {
    const res = await fetch("/api/traces", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ records: all }),
      signal: AbortSignal.timeout(5000),
    });
    if (!res.ok) throw new Error(`daemon rejected traces: ${res.status}`);
    localStorage.removeItem(BUFFER_KEY);
  } catch {
    localStorage.setItem(BUFFER_KEY, JSON.stringify(all));
  }
}