// src/services/voiceDiag/checks/wan/wanHealthscore.js
//
// Prisma AIOps site healthscore (0-100, higher is better). This is
// Prisma's own composite score that rolls up per-path LQM, link
// availability, application health, and device health — so it's a
// good broad-brush signal for "is anything wrong on this site"
// before drilling into the individual per-path checks below.
//
// Thresholds default to 80 (warn) / 60 (error), reflecting the
// bands Prisma's own UI uses in its site-health dashboard. Both
// are overridable via WAN_STANDARD_HEALTHSCORE_WARN / _ERROR.
//
// Skipped when no site was matched OR when the healthscore fetch
// failed (composer preserves that in ctx.sdwanData.errors[]).

import {
  maybeSkippedByKillSwitch,
  getHealthscoreWarn,
  getHealthscoreError,
} from './_helpers.js';

export const WAN_HEALTHSCORE_STANDARDS = Object.freeze({
  minWarn: 80,
  minError: 60,
});

export const wanHealthscoreCheck = {
  id: 'wanHealthscore',
  label: 'SD-WAN Site Healthscore',
  requires: ['sdwanSite'],
  scope: null,
  standards: WAN_HEALTHSCORE_STANDARDS,

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

    const hs = ctx.sdwanData?.healthscore;
    if (!hs || hs.value === null || hs.value === undefined) {
      return {
        status: 'skipped',
        message: 'Healthscore not available from Prisma (likely a partial fetch — see other checks).',
        details: null,
        remediation: null,
      };
    }

    const value = Number(hs.value);
    const warnThresh = getHealthscoreWarn();
    const errorThresh = getHealthscoreError();

    if (value < errorThresh) {
      return {
        status: 'error',
        message: `Healthscore ${value}/100 is below the error floor (${errorThresh}). The site is in a degraded state per Prisma AIOps.`,
        details: { value, warnThresh, errorThresh, breakdown: hs.breakdown || {} },
        remediation: null,
      };
    }

    if (value < warnThresh) {
      return {
        status: 'warn',
        message: `Healthscore ${value}/100 is below the warning threshold (${warnThresh}). Investigate before it becomes user-visible.`,
        details: { value, warnThresh, errorThresh, breakdown: hs.breakdown || {} },
        remediation: null,
      };
    }

    return {
      status: 'ok',
      message: `Healthscore ${value}/100 (>=${warnThresh}). Site is healthy per Prisma AIOps.`,
      details: { value, warnThresh, errorThresh, breakdown: hs.breakdown || {} },
      remediation: null,
    };
  },
};