// tests/kb-update/test-taxonomy.test.mjs
// Unit tests for scripts/kb-update/lib/taxonomy.mjs + data/domain-taxonomy.json.
// The taxonomy is the single source of truth (lag 0) consolidating the four
// previously-divergent taxonomies: poll TARGET_PREFIXES, discover INCLUDE/EXCLUDE,
// category-skill-map.json, and report-changes getFilePriority. These tests pin the
// behaviour the refactored scripts must reproduce, plus the no-divergence invariant.

import { test } from 'node:test';
import assert from 'node:assert/strict';
import { mkdtempSync, rmSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { join } from 'node:path';
import {
  loadTaxonomy,
  saveTaxonomy,
  getSitemapPrefixes,
  getCategorySkill,
  makeClassifier,
  makeCourseClassifier,
  makePriorityFn,
  applyCategoryReassignments,
} from '../../scripts/kb-update/lib/taxonomy.mjs';

const tax = loadTaxonomy();

// --- (a) sitemap prefixes — poll/discover parity ---
test('sitemap_prefixes — 23 entries with poll/discover parity', () => {
  const prefixes = getSitemapPrefixes(tax);
  assert.equal(prefixes.length, 23);
  // poll superset includes the 6 that discover previously lacked
  for (const p of ['microsoftteams_en-us_', 'sharepoint_en-us_', 'microsoft-365_en-us_',
                   'training_en-us_', 'cloud-computing_en-us_', 'privacy_en-us_']) {
    assert.ok(prefixes.includes(p), `missing prefix ${p}`);
  }
  assert.ok(prefixes.includes('azure_en-us_'));
  // dotnet is deliberately excluded (75 sitemaps, 12 matches)
  assert.ok(!prefixes.includes('dotnet_en-us_'));
});

// Fase 1a registry-herding: 5 stack-relevant docsets whose cited URLs were
// stranded as not_in_sitemap because their child sitemaps were never polled.
// Each is a single child sitemap (verified live against the sitemap index).
test('sitemap_prefixes — Fase 1a additions (graph / power / ai-builder / search)', () => {
  const prefixes = getSitemapPrefixes(tax);
  for (const p of ['graph_en-us_', 'ai-builder_en-us_', 'power-apps_en-us_',
                   'power-automate_en-us_', 'microsoftsearch_en-us_']) {
    assert.ok(prefixes.includes(p), `missing Fase 1a prefix ${p}`);
  }
});

// --- (c) category → skill — PHYSICAL DISK is canonical ---
test('category_skill — disk-truth canonical (the 4 formerly stale entries)', () => {
  // category-skill-map.json had these as ms-ai-engineering; disk says otherwise.
  assert.equal(getCategorySkill(tax, 'monitoring-observability'), 'ms-ai-governance');
  assert.equal(getCategorySkill(tax, 'copilot-extensibility'), 'ms-ai-advisor');
  assert.equal(getCategorySkill(tax, 'prompt-engineering'), 'ms-ai-advisor');
  assert.equal(getCategorySkill(tax, 'performance-scalability'), 'ms-ai-security');
  // unchanged ones
  assert.equal(getCategorySkill(tax, 'rag-architecture'), 'ms-ai-engineering');
  assert.equal(getCategorySkill(tax, 'responsible-ai'), 'ms-ai-governance');
  assert.equal(getCategorySkill(tax, 'cost-optimization'), 'ms-ai-security');
  // unknown category → null
  assert.equal(getCategorySkill(tax, 'does-not-exist'), null);
});

// --- (b) classifyUrl — reproduces discover's classification exactly ---
test('classifyUrl — include rules map to correct {skill, category}', () => {
  const classify = makeClassifier(tax);
  assert.deepEqual(
    classify('https://learn.microsoft.com/azure/ai-foundry/openai/how-to/manage-costs'),
    { skill: 'ms-ai-engineering', category: 'azure-ai-services' }
  );
  // monitoring → governance (was a divergence; derivation reproduces discover's original)
  assert.deepEqual(
    classify('https://learn.microsoft.com/azure/azure-monitor/logs/foo'),
    { skill: 'ms-ai-governance', category: 'monitoring-observability' }
  );
  // copilot-studio → advisor (was a divergence; derivation reproduces discover's original)
  assert.deepEqual(
    classify('https://learn.microsoft.com/microsoft-copilot-studio/fundamentals-what-is'),
    { skill: 'ms-ai-advisor', category: 'copilot-extensibility' }
  );
  // alternation pattern
  assert.deepEqual(
    classify('https://learn.microsoft.com/security/benchmark/azure/foo'),
    { skill: 'ms-ai-security', category: 'ai-security-engineering' }
  );
});

test('classifyUrl — exclude wins over include and non-matches return null', () => {
  const classify = makeClassifier(tax);
  // /samples/ excluded even though /azure/ai-foundry/ would include
  assert.equal(classify('https://learn.microsoft.com/azure/ai-foundry/samples/quickstart'), null);
  // /training/ excluded
  assert.equal(classify('https://learn.microsoft.com/training/modules/intro'), null);
  // unrelated path
  assert.equal(classify('https://learn.microsoft.com/azure/virtual-machines/overview'), null);
});

test('INVARIANT — every include category resolves and skill === category_skill[category]', () => {
  const classify = makeClassifier(tax);
  for (const rule of tax.relevance.include) {
    const skill = getCategorySkill(tax, rule.category);
    assert.ok(skill, `include category ${rule.category} absent from category_skill`);
  }
  // probe each rule via a synthetic URL and assert no skill/category divergence
  const probes = [
    ['https://learn.microsoft.com/azure/ai-foundry/x', 'azure-ai-services'],
    ['https://learn.microsoft.com/azure/machine-learning/x', 'mlops-genaiops'],
    ['https://learn.microsoft.com/azure/search/x', 'rag-architecture'],
    ['https://learn.microsoft.com/azure/azure-monitor/x', 'monitoring-observability'],
    ['https://learn.microsoft.com/azure/well-architected/x', 'architecture'],
    ['https://learn.microsoft.com/microsoft-copilot-studio/x', 'copilot-extensibility'],
    ['https://learn.microsoft.com/purview/x', 'responsible-ai'],
    ['https://learn.microsoft.com/agent-framework/x', 'agent-orchestration'],
    ['https://learn.microsoft.com/azure/cosmos-db/x', 'data-engineering'],
  ];
  for (const [url, expectedCat] of probes) {
    const r = classify(url);
    assert.ok(r, `no classification for ${url}`);
    assert.equal(r.category, expectedCat);
    assert.equal(r.skill, getCategorySkill(tax, r.category), `divergence at ${url}`);
  }
});

// --- (d) getFilePriority — reproduces report-changes ordering exactly ---
test('getFilePriority — pattern → priority, first match wins', () => {
  const prio = makePriorityFn(tax);
  assert.equal(prio('skills/ms-ai-security/references/cost-optimization/budget.md'), 'critical');
  assert.equal(prio('skills/ms-ai-governance/references/responsible-ai/fairness.md'), 'high');
  // 'governance' substring → high
  assert.equal(prio('skills/ms-ai-governance/references/norwegian-public-sector-governance/x.md'), 'high');
  assert.equal(prio('skills/ms-ai-advisor/references/platforms/copilot-studio.md'), 'medium');
  // no pattern → low
  assert.equal(prio('skills/ms-ai-engineering/references/data-engineering/cosmos.md'), 'low');
});

test('getFilePriority — order: cost (critical) outranks governance (high)', () => {
  const prio = makePriorityFn(tax);
  // contains both 'cost' and 'governance' — critical rule is evaluated first
  assert.equal(prio('skills/x/references/cost-governance-tradeoffs.md'), 'critical');
});

// --- (e) taxonomy persistence (Sesjon 19, B3 merge-apply) ---
// merge-apply repoints every category owned by the absorbed skill to the
// absorber and must PERSIST that to domain-taxonomy.json. Two new primitives:
// a pure reassign helper + an atomic save mirroring saveDecisions.

test('applyCategoryReassignments — repoints only matching from->to; pure (no mutation)', () => {
  const before = JSON.parse(JSON.stringify(tax.category_skill));
  const next = applyCategoryReassignments(tax, [
    { category: 'rag-architecture', from: 'ms-ai-engineering', to: 'ms-ai-advisor' }, // matches → repointed
    { category: 'responsible-ai', from: 'ms-ai-NONMATCH', to: 'ms-ai-advisor' },       // current != from → no-op
    { category: 'does-not-exist', from: 'whatever', to: 'ms-ai-advisor' },             // absent category → no-op
  ]);
  assert.equal(next.category_skill['rag-architecture'], 'ms-ai-advisor', 'matching entry repointed');
  assert.equal(next.category_skill['responsible-ai'], 'ms-ai-governance', 'non-matching from is a no-op');
  assert.equal(next.category_skill['does-not-exist'], undefined, 'absent category stays absent');
  // purity: original object + its nested map are untouched, a fresh object is returned
  assert.deepEqual(tax.category_skill, before);
  assert.notEqual(next, tax);
  assert.notEqual(next.category_skill, tax.category_skill);
});

test('saveTaxonomy + loadTaxonomy — atomic round-trip preserves content', () => {
  const dir = mkdtempSync(join(tmpdir(), 'tax-save-'));
  try {
    const next = applyCategoryReassignments(tax, [
      { category: 'rag-architecture', from: 'ms-ai-engineering', to: 'ms-ai-advisor' },
    ]);
    saveTaxonomy(next, dir);
    const reloaded = loadTaxonomy(dir);
    assert.equal(getCategorySkill(reloaded, 'rag-architecture'), 'ms-ai-advisor', 'reassignment persisted');
    assert.equal(getCategorySkill(reloaded, 'responsible-ai'), 'ms-ai-governance', 'untouched entries survive');
    assert.equal(reloaded.version, tax.version, 'non-category_skill fields survive the round-trip');
  } finally {
    rmSync(dir, { recursive: true, force: true });
  }
});

// --- (f) makeCourseClassifier (C3.3) — product-slug → {skill, category} ---
// course_products maps an in-domain Learn product slug → category; the owning
// skill is DERIVED from category_skill (never stored redundantly), mirroring
// makeClassifier's anti-divergence rule. First in-domain product wins; a course
// whose products are all out-of-domain returns null (not a lead).

// Synthetic taxonomy isolates the classifier's behaviour from the real data.
const courseTax = {
  category_skill: {
    'azure-ai-services': 'ms-ai-engineering',
    'platforms': 'ms-ai-advisor',
  },
  course_products: {
    'azure-openai': 'azure-ai-services',
    'microsoft-copilot-studio': 'platforms',
    'power-automate': 'platforms',
  },
};

test('makeCourseClassifier — in-domain slug → derived {skill, category}', () => {
  const classify = makeCourseClassifier(courseTax);
  assert.deepEqual(classify(['azure-openai']), { skill: 'ms-ai-engineering', category: 'azure-ai-services' });
  assert.deepEqual(classify(['microsoft-copilot-studio']), { skill: 'ms-ai-advisor', category: 'platforms' });
});

test('makeCourseClassifier — first in-domain product wins (order matters)', () => {
  const classify = makeCourseClassifier(courseTax);
  // a leading out-of-domain slug is skipped; first in-domain wins
  assert.deepEqual(classify(['some-unknown-product', 'azure-openai']), { skill: 'ms-ai-engineering', category: 'azure-ai-services' });
  // when two in-domain products are present, the FIRST in the list wins
  assert.deepEqual(classify(['azure-openai', 'power-automate']), { skill: 'ms-ai-engineering', category: 'azure-ai-services' });
  assert.deepEqual(classify(['power-automate', 'azure-openai']), { skill: 'ms-ai-advisor', category: 'platforms' });
});

test('makeCourseClassifier — out-of-domain / empty / non-array → null', () => {
  const classify = makeCourseClassifier(courseTax);
  assert.equal(classify(['totally-unknown', 'another-unknown']), null, 'all out-of-domain → null');
  assert.equal(classify([]), null, 'empty products → null');
  assert.equal(classify(null), null, 'non-array input → null (defensive)');
  assert.equal(classify(undefined), null, 'undefined input → null (defensive)');
});

test('makeCourseClassifier — taxonomy without course_products → always null', () => {
  const classify = makeCourseClassifier({ category_skill: {} });
  assert.equal(classify(['azure-openai']), null, 'absent course_products map → no lead');
});

// --- (g) REAL course_products invariant (C3.3 data, enumerated from live API) ---
test('INVARIANT — every course_products category resolves to a skill, derivation matches', () => {
  assert.ok(tax.course_products, 'course_products section present in domain-taxonomy.json');
  assert.ok(Object.keys(tax.course_products).length > 0, 'course_products is non-empty');
  const classify = makeCourseClassifier(tax);
  for (const [slug, category] of Object.entries(tax.course_products)) {
    assert.equal(typeof category, 'string', `${slug} maps to a category string`);
    const skill = getCategorySkill(tax, category);
    assert.ok(skill, `course_products slug ${slug} → category ${category} absent from category_skill`);
    assert.deepEqual(classify([slug]), { skill, category }, `divergence for slug ${slug}`);
  }
});

test('makeCourseClassifier — azure-openai (verified-live slug) → engineering/azure-ai-services', () => {
  // azure-openai is the empirically-confirmed live slug (spike §: 34 hits).
  const classify = makeCourseClassifier(tax);
  assert.deepEqual(classify(['azure-openai']), { skill: 'ms-ai-engineering', category: 'azure-ai-services' });
});