// Tests for the STEG 0 nav-golden corpus gate (check-nav-golden.mjs).
// Style mirrors check-okf-parity.test.mjs: node:test, temp fixtures, a subprocess for
// the CLI exit contract, zero npm deps. Two layers:
//   1. Over the COMMITTED corpus — both consumed fixtures conform + their goldens are present.
//   2. Runtime-materialized meta-tests that drive each FAIL axis (untyped concept, missing
//      okf_version, absent bundle/, absent golden, empty golden) + the orphan-dir report.
// SCOPE mirror: this gate is THIN (conformance + golden presence). It does NOT run a
// navigator, so there is no byte-exact golden assertion here — that is a consumer concern.
import { test } from 'node:test';
import assert from 'node:assert/strict';
import { execFileSync } from 'node:child_process';
import { mkdtempSync, writeFileSync, mkdirSync, rmSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { join, dirname } from 'node:path';
import { fileURLToPath } from 'node:url';
import { checkFixture, runCorpus, GOLDEN_FILE } from './check-nav-golden.mjs';

const HERE = dirname(fileURLToPath(import.meta.url));
const RUNNER = join(HERE, 'check-nav-golden.mjs');
const CORPUS = join(HERE, '..', 'test', 'nav-golden-corpus');

function tmpRoot() {
  return mkdtempSync(join(tmpdir(), 'nav-golden-'));
}

// Materialize a minimal fixture directory: <base>/<name>/{bundle/{index.md,concept.md},golden}.
// Options flip each FAIL axis independently.
function makeFixture(base, name, opts = {}) {
  const {
    withBundle = true,
    okfVersion = true,
    conceptTyped = true,
    golden = 'read-context body\n',
  } = opts;
  const fdir = join(base, name);
  mkdirSync(fdir, { recursive: true });
  if (withBundle) {
    const bundle = join(fdir, 'bundle');
    mkdirSync(bundle, { recursive: true });
    writeFileSync(
      join(bundle, 'index.md'),
      okfVersion ? '---\ntype: index\nokf_version: 0.1\n---\n# root\n' : '---\ntype: index\n---\n# root\n',
    );
    writeFileSync(
      join(bundle, 'concept.md'),
      conceptTyped ? '---\ntype: project\ntitle: C\n---\n# c\n' : '---\ntitle: C\n---\n# c\n',
    );
  }
  if (golden !== null) writeFileSync(join(fdir, GOLDEN_FILE), golden);
  return fdir;
}

// --- Layer 1: the committed corpus (the acceptance binding for the consumed fixtures) ---
test('committed corpus: both nav-golden fixtures conform and their goldens are present', () => {
  const { results, failed, orphans, exitCode } = runCorpus(CORPUS);
  assert.equal(exitCode, 0, `committed corpus must be green; failed: ${JSON.stringify(failed.map((f) => f.fixture))}`);
  assert.deepEqual(failed, []);
  assert.deepEqual(orphans, [], `no unmanifested corpus dirs; orphans: ${orphans.join(', ')}`);
  const byName = Object.fromEntries(results.map((r) => [r.fixture, r]));
  for (const name of ['nav-golden-hierarchy', 'nav-golden-escape']) {
    const r = byName[name];
    assert.ok(r, `${name} must be in the manifest`);
    assert.equal(r.status, 'PASS', `${name} must PASS`);
    assert.equal(r.okf.okfVersion, '0.1', `${name} bundle root must echo okf_version 0.1`);
    assert.equal(r.goldenPresent, true);
    assert.equal(r.goldenNonEmpty, true);
    assert.deepEqual(r.problems, []);
  }
});

test('CLI over committed corpus: exit 0 + "OK: nav-golden" line', () => {
  const stdout = execFileSync('node', [RUNNER], { encoding: 'utf8' });
  assert.match(stdout, /OK: nav-golden fixtures conform/);
});

// --- Layer 2: materialized FAIL axes (checkFixture is pure over a fixture dir) ---
test('PASS: a well-formed fixture (typed concept + okf_version + non-empty golden)', () => {
  const base = tmpRoot();
  try {
    const fdir = makeFixture(base, 'ok');
    const r = checkFixture(fdir, 'ok');
    assert.equal(r.status, 'PASS');
    assert.deepEqual(r.problems, []);
    assert.equal(r.okf.okfVersion, '0.1');
    assert.equal(r.goldenNonEmpty, true);
  } finally {
    rmSync(base, { recursive: true, force: true });
  }
});

test('FAIL: a concept file without type', () => {
  const base = tmpRoot();
  try {
    const fdir = makeFixture(base, 'untyped', { conceptTyped: false });
    const r = checkFixture(fdir, 'untyped');
    assert.equal(r.status, 'FAIL');
    assert.ok(r.problems.some((p) => /without type/.test(p)), `problems: ${r.problems.join('; ')}`);
  } finally {
    rmSync(base, { recursive: true, force: true });
  }
});

test('FAIL: root index.md without okf_version', () => {
  const base = tmpRoot();
  try {
    const fdir = makeFixture(base, 'nover', { okfVersion: false });
    const r = checkFixture(fdir, 'nover');
    assert.equal(r.status, 'FAIL');
    assert.ok(r.problems.some((p) => /okf_version/.test(p)), `problems: ${r.problems.join('; ')}`);
  } finally {
    rmSync(base, { recursive: true, force: true });
  }
});

test('FAIL: missing bundle/ directory', () => {
  const base = tmpRoot();
  try {
    const fdir = makeFixture(base, 'nobundle', { withBundle: false });
    const r = checkFixture(fdir, 'nobundle');
    assert.equal(r.status, 'FAIL');
    assert.ok(r.problems.some((p) => /bundle\//.test(p)), `problems: ${r.problems.join('; ')}`);
  } finally {
    rmSync(base, { recursive: true, force: true });
  }
});

test('FAIL: the committed golden is absent', () => {
  const base = tmpRoot();
  try {
    const fdir = makeFixture(base, 'nogolden', { golden: null });
    const r = checkFixture(fdir, 'nogolden');
    assert.equal(r.status, 'FAIL');
    assert.equal(r.goldenPresent, false);
    assert.ok(r.problems.some((p) => new RegExp(GOLDEN_FILE).test(p)), `problems: ${r.problems.join('; ')}`);
  } finally {
    rmSync(base, { recursive: true, force: true });
  }
});

test('FAIL: the golden is present but empty (whitespace only)', () => {
  const base = tmpRoot();
  try {
    const fdir = makeFixture(base, 'emptygolden', { golden: '   \n\n' });
    const r = checkFixture(fdir, 'emptygolden');
    assert.equal(r.status, 'FAIL');
    assert.equal(r.goldenPresent, true);
    assert.equal(r.goldenNonEmpty, false);
  } finally {
    rmSync(base, { recursive: true, force: true });
  }
});

// --- Layer 2b: runCorpus over a materialized corpus (manifest + orphan report + exit code) ---
test('runCorpus: a FAIL fixture drives exit 1; an unmanifested dir is reported as an orphan', () => {
  const base = tmpRoot();
  try {
    makeFixture(base, 'good');
    makeFixture(base, 'bad', { conceptTyped: false });
    makeFixture(base, 'stowaway'); // on disk but NOT in the manifest -> orphan
    writeFileSync(
      join(base, 'manifest.json'),
      JSON.stringify({
        fixtures: {
          good: { axis: 'a' },
          bad: { axis: 'b' },
        },
      }),
    );
    const { results, orphans, failed, exitCode } = runCorpus(base);
    assert.equal(exitCode, 1, 'a FAIL fixture must make the corpus red');
    assert.deepEqual(failed.map((f) => f.fixture).sort(), ['bad']);
    assert.deepEqual(orphans, ['stowaway']);
    const good = results.find((r) => r.fixture === 'good');
    assert.equal(good.status, 'PASS');
  } finally {
    rmSync(base, { recursive: true, force: true });
  }
});

test('runCorpus: a manifested fixture absent on disk is reported MISSING (exit 1)', () => {
  const base = tmpRoot();
  try {
    makeFixture(base, 'present');
    writeFileSync(
      join(base, 'manifest.json'),
      JSON.stringify({ fixtures: { present: { axis: 'a' }, ghost: { axis: 'b' } } }),
    );
    const { failed, exitCode } = runCorpus(base);
    assert.equal(exitCode, 1);
    assert.ok(failed.some((f) => f.fixture === 'ghost' && f.status === 'MISSING'));
  } finally {
    rmSync(base, { recursive: true, force: true });
  }
});