// Unit tests for services/enrichment/alarmSemantics.js
//
// Coverage targets:
//   - Known codes map to their expected category
//   - Unknown codes fall through to 'other' (never throw)
//   - Humanizer returns a friendly string; unknown codes become
//     Title-Cased words rather than a raw constant
//   - rollupAlarms collapses (code+severity) tuples, preserves the
//     newest timestamp, and orders critical → major → minor
//   - countByCategory sums correctly and defaults missing fields to 0
//   - humanizeAge produces the expected "just now / Nm / Nh / Nd" bands
//   - humanizeWindow formats 15/60/360/1440 minutes as 15m/1h/6h/1d

import test from 'node:test';
import assert from 'node:assert/strict';

import {
  categorizeAlarm,
  humanizeAlarmCode,
  rollupAlarms,
  countByCategory,
  humanizeAge,
  humanizeWindow,
  isVoiceRelevantAlarm,
  coerceAlarmTsMs,
} from '../services/enrichment/alarmSemantics.js';

// ─── categorizeAlarm ─────────────────────────────────────────────────

test('categorizeAlarm: overlay codes bucket as overlay', () => {
  for (const code of [
    'NETWORK_ANYNETLINK_DOWN',
    'NETWORK_VPNLINK_DOWN',
    'NETWORK_VPNLINK_FLAP',
    'NETWORK_SITE_UNREACHABLE',
    'NETWORK_STANDBY_LINK_DOWN',
    'SITE_CONNECTIVITY_DEGRADED',
  ]) {
    assert.equal(categorizeAlarm(code), 'overlay', `${code} → overlay`);
  }
});

test('categorizeAlarm: physical WAN codes bucket as physical', () => {
  for (const code of [
    'NETWORK_INTERNET_DOWN',
    'DEVICE_INTERFACE_DOWN',
    'DEVICE_INTERFACE_STATE_CHANGED',
    'NETWORK_LTE_LINK_DOWN',
  ]) {
    assert.equal(categorizeAlarm(code), 'physical', `${code} → physical`);
  }
});

test('categorizeAlarm: device / ION codes bucket as device', () => {
  for (const code of [
    'DEVICE_HB_MISSED',
    'DEVICE_UNREACHABLE',
    'DEVICE_HIGH_CPU',
    'DEVICE_REBOOT',
  ]) {
    assert.equal(categorizeAlarm(code), 'device');
  }
});

test('categorizeAlarm: unknown / falsy → other (never throws)', () => {
  assert.equal(categorizeAlarm('SOMETHING_BRAND_NEW'), 'other');
  assert.equal(categorizeAlarm(''), 'other');
  assert.equal(categorizeAlarm(null), 'other');
  assert.equal(categorizeAlarm(undefined), 'other');
});

test('categorizeAlarm: case-insensitive on input', () => {
  assert.equal(categorizeAlarm('network_anynetlink_down'), 'overlay');
});

// ─── humanizeAlarmCode ───────────────────────────────────────────────

test('humanizeAlarmCode: known codes → friendly labels', () => {
  assert.equal(humanizeAlarmCode('NETWORK_ANYNETLINK_DOWN'), 'SD-WAN overlay tunnel down');
  assert.equal(humanizeAlarmCode('DEVICE_HB_MISSED'), 'ION heartbeat missed');
  assert.equal(humanizeAlarmCode('NETWORK_INTERNET_DOWN'), 'Internet WAN circuit down');
});

test('humanizeAlarmCode: unknown code → Title Cased fallback (not raw constant)', () => {
  assert.equal(humanizeAlarmCode('SOMETHING_BRAND_NEW_DOWN'), 'Something Brand New Down');
});

test('humanizeAlarmCode: falsy → generic fallback', () => {
  assert.equal(humanizeAlarmCode(''), 'Unknown alarm');
  assert.equal(humanizeAlarmCode(null), 'Unknown alarm');
});

// ─── rollupAlarms ────────────────────────────────────────────────────

test('rollupAlarms: collapses (code + severity) tuples, keeps newest ts', () => {
  const samples = [
    { code: 'X', severity: 'major', ts: '2026-07-09T10:00:00Z' },
    { code: 'X', severity: 'major', ts: '2026-07-09T12:00:00Z' },
    { code: 'X', severity: 'major', ts: '2026-07-09T09:00:00Z' },
    { code: 'Y', severity: 'critical', ts: '2026-07-09T08:00:00Z' },
  ];
  const rollups = rollupAlarms(samples);
  assert.equal(rollups.length, 2);
  // Critical severity floats to the top regardless of count.
  assert.equal(rollups[0].code, 'Y');
  assert.equal(rollups[0].count, 1);
  assert.equal(rollups[1].code, 'X');
  assert.equal(rollups[1].count, 3);
  // Newest ts survives.
  assert.equal(rollups[1].newestTs, '2026-07-09T12:00:00Z');
});

test('rollupAlarms: sort — critical > major > minor, ties broken by count desc', () => {
  const rollups = rollupAlarms([
    { code: 'A', severity: 'minor',    ts: 't1' },
    { code: 'B', severity: 'major',    ts: 't2' },
    { code: 'C', severity: 'critical', ts: 't3' },
    { code: 'D', severity: 'major',    ts: 't4' },
    { code: 'D', severity: 'major',    ts: 't5' },
  ]);
  assert.deepEqual(
    rollups.map((r) => r.code),
    ['C', 'D', 'B', 'A'],
    'critical (C), then major sorted by count (D×2, B×1), then minor',
  );
});

test('rollupAlarms: null/empty → []', () => {
  assert.deepEqual(rollupAlarms(null), []);
  assert.deepEqual(rollupAlarms([]),   []);
  assert.deepEqual(rollupAlarms(undefined), []);
});

// ─── countByCategory ─────────────────────────────────────────────────

test('countByCategory: counts overlay/physical/device/other + total', () => {
  const c = countByCategory([
    { code: 'NETWORK_ANYNETLINK_DOWN' },
    { code: 'NETWORK_ANYNETLINK_DOWN' },
    { code: 'NETWORK_INTERNET_DOWN' },
    { code: 'DEVICE_HB_MISSED' },
    { code: 'UNRECOGNIZED_FOO' },
  ]);
  assert.deepEqual(c, {
    overlay: 2, physical: 1, device: 1, other: 1, total: 5,
  });
});

test('countByCategory: empty → all zeros', () => {
  assert.deepEqual(countByCategory([]), {
    overlay: 0, physical: 0, device: 0, other: 0, total: 0,
  });
});

// ─── humanizeAge ─────────────────────────────────────────────────────

test('humanizeAge: coarse buckets', () => {
  const now = Date.parse('2026-07-09T14:00:00Z');
  const at = (offsetSec) =>
    humanizeAge(new Date(now - offsetSec * 1000).toISOString(), now);
  assert.equal(at(10),        'just now');
  assert.equal(at(120),       '2m ago');
  assert.equal(at(3600 * 2),  '2h ago');
  assert.equal(at(86400 * 3), '3d ago');
});

test('humanizeAge: missing / invalid ts → empty string', () => {
  assert.equal(humanizeAge(null), '');
  assert.equal(humanizeAge(undefined), '');
  assert.equal(humanizeAge('not-a-date'), '');
});

// ─── humanizeWindow ──────────────────────────────────────────────────

test('humanizeWindow: canonical values', () => {
  assert.equal(humanizeWindow(15),    '15m');
  assert.equal(humanizeWindow(45),    '45m');
  assert.equal(humanizeWindow(60),    '1h');
  assert.equal(humanizeWindow(360),   '6h');
  assert.equal(humanizeWindow(1440),  '1d');
  assert.equal(humanizeWindow(2880),  '2d');
  assert.equal(humanizeWindow(10080), '7d',
    'the new default WAN window must round-trip cleanly');
});

test('isVoiceRelevantAlarm: overlay/physical/device yes, other no', () => {
  assert.equal(isVoiceRelevantAlarm('NETWORK_VPNLINK_DOWN'), true);
  assert.equal(isVoiceRelevantAlarm('NETWORK_INTERNET_DOWN'), true);
  assert.equal(isVoiceRelevantAlarm('DEVICE_REBOOT'), true);
  assert.equal(isVoiceRelevantAlarm('DHCP_FAILURE'), false);
});

test('coerceAlarmTsMs: ISO and epoch', () => {
  assert.equal(coerceAlarmTsMs('2025-01-01T00:00:00Z'), Date.parse('2025-01-01T00:00:00Z'));
  assert.equal(coerceAlarmTsMs(1_700_000_000_000), 1_700_000_000_000);
  assert.equal(coerceAlarmTsMs(null), null);
});