/** Monotonic timings for local requests and authoritative mesh publication. */
export class EditDiagnostics {
  constructor() { this.reset(); }
  reset() { this.requests = new Map(); this.sections = new Map(); this.last = null; }
  request(pos, block, now = performance.now()) {
    for (const [key, value] of this.requests) if (now - value.time > 5000) this.requests.delete(key);
    if (this.requests.size >= 64) this.requests.delete(this.requests.keys().next().value);
    this.requests.set(pos.join(','), { block, time: now });
  }
  confirmed(changes, now = performance.now()) {
    for (const { pos, block } of changes) {
      const key = pos.join(','), request = this.requests.get(key);
      if (!request || request.block !== block || now - request.time > 5000) continue;
      this.requests.delete(key);
      const id = pos.map(v => Math.floor(v / 16)).join(',');
      if (this.sections.size >= 64) this.sections.delete(this.sections.keys().next().value);
      this.sections.set(id, { request: request.time, confirmed: now });
    }
  }
  published(id, now = performance.now()) {
    const edit = this.sections.get(id);
    if (!edit) return null;
    this.sections.delete(id);
    this.last = { acknowledgementMs: edit.confirmed - edit.request,
      geometryMs: now - edit.confirmed, totalMs: now - edit.request };
    return this.last;
  }
}