import { test } from 'node:test';
import { strict as assert } from 'node:assert';
import { mkdtempSync, mkdirSync, writeFileSync, rmSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { join } from 'node:path';
import { discoverArchitecture } from '../../lib/validators/architecture-discovery.mjs';

function setup(structure) {
  const root = mkdtempSync(join(tmpdir(), 'ultraplan-arch-'));
  for (const [path, content] of Object.entries(structure)) {
    const full = join(root, path);
    mkdirSync(join(full, '..'), { recursive: true });
    writeFileSync(full, content);
  }
  return root;
}

test('discoverArchitecture — canonical overview.md found cleanly', () => {
  const root = setup({ 'architecture/overview.md': '# Overview\n' });
  try {
    const r = discoverArchitecture(root);
    assert.equal(r.found, true);
    assert.match(r.overview, /architecture\/overview\.md$/);
    assert.equal(r.warnings.length, 0);
    assert.equal(r.firstHeading, 'Overview');
  } finally { rmSync(root, { recursive: true, force: true }); }
});

test('discoverArchitecture — no architecture dir = not found, no warnings', () => {
  const root = setup({ 'brief.md': 'b' });
  try {
    const r = discoverArchitecture(root);
    assert.equal(r.found, false);
    assert.equal(r.warnings.length, 0);
  } finally { rmSync(root, { recursive: true, force: true }); }
});

test('discoverArchitecture — non-canonical name discovered with warning (drift-WARN)', () => {
  const root = setup({ 'architecture/architecture-overview.md': '# Drifted\n' });
  try {
    const r = discoverArchitecture(root);
    assert.equal(r.found, true);
    assert.ok(r.warnings.find(w => w.code === 'ARCH_NON_CANONICAL_OVERVIEW'));
  } finally { rmSync(root, { recursive: true, force: true }); }
});

test('discoverArchitecture — loose unknown files surfaced as drift warning', () => {
  const root = setup({
    'architecture/overview.md': '# OK\n',
    'architecture/random-note.md': 'x',
    'architecture/another.md': 'y',
  });
  try {
    const r = discoverArchitecture(root);
    assert.equal(r.found, true);
    assert.ok(r.warnings.find(w => w.code === 'ARCH_LOOSE_FILES'));
    assert.equal(r.looseFiles.length, 2);
  } finally { rmSync(root, { recursive: true, force: true }); }
});

test('discoverArchitecture — gaps.md detected when present', () => {
  const root = setup({
    'architecture/overview.md': '# OK\n',
    'architecture/gaps.md': '# Gaps\n',
  });
  try {
    const r = discoverArchitecture(root);
    assert.match(r.gaps, /architecture\/gaps\.md$/);
  } finally { rmSync(root, { recursive: true, force: true }); }
});

test('discoverArchitecture — never reads body beyond first heading', () => {
  const root = setup({
    'architecture/overview.md': '# Overview\n\n## Components\n\nlots of detail that we MUST NOT validate\n',
  });
  try {
    const r = discoverArchitecture(root);
    assert.equal(r.firstHeading, 'Overview');
    // Validator does not assert on Components section — that's the contract.
  } finally { rmSync(root, { recursive: true, force: true }); }
});