// src/services/voiceDiag/checks/wan/wanAlarms.js
//
// Recent Prisma alarms surface. Not a threshold check — the
// severity is a direct pass-through of what Prisma raised:
//
//   - critical → error
//   - major → warn
//   - minor → info-only (stays 'ok', but details show the count)
//
// Window defaults to the composer's 1-hour lookback. An "active
// incident" that Prisma sees is materially more urgent than a
// snapshot LQM anomaly, so this deliberately runs even when the
// per-metric checks are all green — a critical alarm from 45 min
// ago is still the operator's problem.

import { maybeSkippedByKillSwitch } from './_helpers.js';

export const WAN_ALARMS_STANDARDS = Object.freeze({
  criticalAllowed: 0,
  majorAllowed: 0,
});

export const wanAlarmsCheck = {
  id: 'wanAlarms',
  label: 'SD-WAN Alarms (last 1h)',
  requires: ['sdwanSite'],
  scope: null,
  standards: WAN_ALARMS_STANDARDS,

  async run(ctx) {
    const skip = maybeSkippedByKillSwitch(wanAlarmsCheck);
    if (skip) return skip;

    const alarms = ctx.sdwanData?.alarms;
    if (!alarms) {
      return {
        status: 'skipped',
        message: 'Alarms feed not available from Prisma (partial fetch).',
        details: null,
        remediation: null,
      };
    }

    const { critical = 0, major = 0, minor = 0 } = alarms.last1h || {};
    const samples = Array.isArray(alarms.samples) ? alarms.samples : [];

    const details = {
      critical, major, minor,
      recentSamples: samples.slice(0, 3),
    };

    if (critical > 0) {
      return {
        status: 'error',
        message:
          `${critical} critical alarm${critical === 1 ? '' : 's'} raised in the last hour` +
          (samples[0]?.message ? ` — most recent: ${samples[0].code}: ${samples[0].message}` : '.'),
        details,
        remediation: null,
      };
    }

    if (major > 0) {
      return {
        status: 'warn',
        message:
          `${major} major alarm${major === 1 ? '' : 's'} raised in the last hour` +
          (samples[0]?.message ? ` — most recent: ${samples[0].code}: ${samples[0].message}` : '.'),
        details,
        remediation: null,
      };
    }

    if (minor > 0) {
      return {
        status: 'ok',
        message: `${minor} minor alarm${minor === 1 ? '' : 's'} in the last hour, no critical or major.`,
        details,
        remediation: null,
      };
    }

    return {
      status: 'ok',
      message: 'No alarms raised in the last hour.',
      details,
      remediation: null,
    };
  },
};