// server/utils/metrics.ts
import { Histogram } from 'prom-client';

import { register } from '../plugins/metrics';

export const externalCallDuration = new Histogram({
  name: 'gay_cool__external_call_duration_seconds',
  help: 'Длительность внешнего запроса (например, к другим сервисам)',
  labelNames: ['service', 'status'],
  buckets: [0.05, 0.1, 0.3, 0.5, 1, 2, 5],
  registers: [register],
});

export async function trackExternalCall<T>(
  serviceName: string,
  fn: () => Promise<T>
): Promise<T> {
  const start = process.hrtime();
  try {
    const result = await fn();
    const [s, ns] = process.hrtime(start);
    externalCallDuration.observe({ service: serviceName, status: 'success' }, s + ns / 1e9);
    return result;
  } catch (e) {
    const [s, ns] = process.hrtime(start);
    externalCallDuration.observe({ service: serviceName, status: 'error' }, s + ns / 1e9);
    throw e;
  }
}