// allow-test-rule: pending-migration-to-typed-ir [#2974]
// Tracked in #2974 for migration to typed-IR assertions per CONTRIBUTING.md
// "Prohibited: Raw Text Matching on Test Outputs". Per-file review may
// reclassify some entries as source-text-is-the-product during migration.

/**
 * GSD Tools Tests - core.cjs
 *
 * Tests for the foundational module's exports including regressions
 * for known bugs (REG-01: loadConfig model_overrides, REG-02: getRoadmapPhaseInternal export).
 */

const { test, describe, beforeEach, afterEach } = require('node:test');
const assert = require('node:assert/strict');
const fs = require('fs');
const path = require('path');
const os = require('os');
const { createTempProject, createTempGitProject, cleanup } = require('./helpers.cjs');

const {
  loadConfig,
  resolveModelInternal,
  escapeRegex,
  generateSlugInternal,
  normalizePhaseName,
  reapStaleTempFiles,
  comparePhaseNum,
  pathExistsInternal,
  getMilestoneInfo,
  getMilestonePhaseFilter,
  getRoadmapPhaseInternal,
  searchPhaseInDir,
  findPhaseInternal,
  findProjectRoot,
  detectSubRepos,
  planningDir,
  timeAgo,
} = require('../get-shit-done/bin/lib/core.cjs');

// ─── loadConfig ────────────────────────────────────────────────────────────────

describe('loadConfig', () => {
  let tmpDir;
  let originalCwd;

  beforeEach(() => {
    tmpDir = createTempProject();
    originalCwd = process.cwd();
  });

  afterEach(() => {
    process.chdir(originalCwd);
    cleanup(tmpDir);
  });

  function writeConfig(obj) {
    fs.writeFileSync(
      path.join(tmpDir, '.planning', 'config.json'),
      JSON.stringify(obj, null, 2)
    );
  }

  test('returns defaults when config.json is missing', () => {
    const config = loadConfig(tmpDir);
    assert.strictEqual(config.model_profile, 'balanced');
    assert.strictEqual(config.commit_docs, true);
    assert.strictEqual(config.research, true);
    assert.strictEqual(config.plan_checker, true);
    assert.strictEqual(config.brave_search, false);
    assert.strictEqual(config.parallelization, true);
    assert.strictEqual(config.nyquist_validation, true);
    assert.strictEqual(config.text_mode, false);
  });

  test('reads model_profile from config.json', () => {
    writeConfig({ model_profile: 'quality' });
    const config = loadConfig(tmpDir);
    assert.strictEqual(config.model_profile, 'quality');
  });

  test('reads nested config keys', () => {
    writeConfig({ planning: { commit_docs: false } });
    const config = loadConfig(tmpDir);
    assert.strictEqual(config.commit_docs, false);
  });

  test('reads branching_strategy from git section', () => {
    writeConfig({ git: { branching_strategy: 'per-phase' } });
    const config = loadConfig(tmpDir);
    assert.strictEqual(config.branching_strategy, 'per-phase');
  });

  // Bug: loadConfig previously omitted model_overrides from return value
  test('returns model_overrides when present (REG-01)', () => {
    writeConfig({ model_overrides: { 'gsd-executor': 'opus' } });
    const config = loadConfig(tmpDir);
    assert.deepStrictEqual(config.model_overrides, { 'gsd-executor': 'opus' });
  });

  test('returns model_overrides as null when not in config', () => {
    writeConfig({ model_profile: 'balanced' });
    const config = loadConfig(tmpDir);
    assert.strictEqual(config.model_overrides, null);
  });

  test('reads response_language when set', () => {
    writeConfig({ response_language: 'Portuguese' });
    const config = loadConfig(tmpDir);
    assert.strictEqual(config.response_language, 'Portuguese');
  });

  test('returns response_language as null when not set', () => {
    writeConfig({ model_profile: 'balanced' });
    const config = loadConfig(tmpDir);
    assert.strictEqual(config.response_language, null);
  });

  test('returns defaults when config.json contains invalid JSON', () => {
    fs.writeFileSync(
      path.join(tmpDir, '.planning', 'config.json'),
      'not valid json {{{{'
    );
    const config = loadConfig(tmpDir);
    assert.strictEqual(config.model_profile, 'balanced');
    assert.strictEqual(config.commit_docs, true);
  });

  test('handles parallelization as boolean', () => {
    writeConfig({ parallelization: false });
    const config = loadConfig(tmpDir);
    assert.strictEqual(config.parallelization, false);
  });

  test('handles parallelization as object with enabled field', () => {
    writeConfig({ parallelization: { enabled: false } });
    const config = loadConfig(tmpDir);
    assert.strictEqual(config.parallelization, false);
  });

  test('prefers top-level keys over nested keys', () => {
    writeConfig({ commit_docs: false, planning: { commit_docs: true } });
    const config = loadConfig(tmpDir);
    assert.strictEqual(config.commit_docs, false);
  });

  test('warns on unknown config keys to stderr (#1535)', (t) => {
    writeConfig({ model_profile: 'quality', active_project: 'my-project', custom_flag: true });
    const origWrite = process.stderr.write;
    let stderrOutput = '';
    process.stderr.write = (chunk) => { stderrOutput += chunk; };
    t.after(() => { process.stderr.write = origWrite; });
    const config = loadConfig(tmpDir);
    // Known key still loads correctly
    assert.strictEqual(config.model_profile, 'quality');
    // Warning emitted for unknown keys
    assert.ok(stderrOutput.includes('active_project'), 'should warn about active_project');
    assert.ok(stderrOutput.includes('custom_flag'), 'should warn about custom_flag');
    assert.ok(stderrOutput.includes('ignored'), 'should mention keys will be ignored');
  });

  test('known config keys are derived from VALID_CONFIG_KEYS (not hardcoded)', () => {
    // Verify that loadConfig's unknown-key check uses config-set's VALID_CONFIG_KEYS
    // as its source of truth. If a new key is added to config-set, it should
    // automatically be recognized by loadConfig without a separate update.
    const { VALID_CONFIG_KEYS } = require('../get-shit-done/bin/lib/config.cjs');
    // Every top-level key from VALID_CONFIG_KEYS should be recognized
    const topLevelKeys = [...VALID_CONFIG_KEYS].map(k => k.split('.')[0]);
    // For value-validated keys (e.g. `runtime` enforces an enum at loadConfig
    // time, see #2517 review finding #10), seed a known-good value so the
    // value-validation warning doesn't fire — this test only checks that the
    // key NAME is recognized, not whether the value itself is valid.
    const KEY_VALID_VALUES = { runtime: 'codex' };
    for (const key of topLevelKeys) {
      const value = KEY_VALID_VALUES[key] ?? 'test-value';
      writeConfig({ [key]: value });
      const origWrite = process.stderr.write;
      let stderrOutput = '';
      process.stderr.write = (chunk) => { stderrOutput += chunk; };
      try {
        loadConfig(tmpDir);
        // Look only for the unknown-KEY warning shape, not any incidental match
        // (the value-validation warning emitted by #2517 mentions key names too).
        const unknownKeyWarning = stderrOutput.includes('unknown config key(s)') &&
          stderrOutput.includes(key);
        assert.ok(
          !unknownKeyWarning,
          `VALID_CONFIG_KEYS key "${key}" should not trigger unknown-key warning`
        );
      } finally {
        process.stderr.write = origWrite;
      }
    }
  });

  test('does not warn when all config keys are known', (t) => {
    writeConfig({ model_profile: 'balanced', workflow: { research: false }, git: { branching_strategy: 'per-phase' } });
    const origWrite = process.stderr.write;
    let stderrOutput = '';
    process.stderr.write = (chunk) => { stderrOutput += chunk; };
    t.after(() => { process.stderr.write = origWrite; });
    loadConfig(tmpDir);
    assert.strictEqual(stderrOutput, '', 'should not emit any warnings for valid config');
  });
});

// ─── loadConfig workstream config inheritance (#2714) ────────────────────────

describe('loadConfig workstream config inheritance (#2714)', () => {
  let tmpDir;
  let originalEnv;

  beforeEach(() => {
    tmpDir = createTempProject();
    originalEnv = process.env.GSD_WORKSTREAM;
    delete process.env.GSD_WORKSTREAM;
  });

  afterEach(() => {
    if (originalEnv !== undefined) {
      process.env.GSD_WORKSTREAM = originalEnv;
    } else {
      delete process.env.GSD_WORKSTREAM;
    }
    cleanup(tmpDir);
  });

  function writeRootConfig(obj) {
    fs.writeFileSync(
      path.join(tmpDir, '.planning', 'config.json'),
      JSON.stringify(obj, null, 2)
    );
  }

  function writeWorkstreamConfig(wsName, obj) {
    const wsDir = path.join(tmpDir, '.planning', 'workstreams', wsName);
    fs.mkdirSync(wsDir, { recursive: true });
    fs.writeFileSync(
      path.join(wsDir, 'config.json'),
      JSON.stringify(obj, null, 2)
    );
  }

  test('workstream config inherits model_overrides from root when not defined in workstream', () => {
    writeRootConfig({ model_overrides: { 'gsd-executor': 'opus' } });
    writeWorkstreamConfig('feature-a', { model_profile: 'quality' });
    process.env.GSD_WORKSTREAM = 'feature-a';
    const config = loadConfig(tmpDir);
    assert.deepStrictEqual(config.model_overrides, { 'gsd-executor': 'opus' });
    assert.strictEqual(config.model_profile, 'quality');
  });

  test('workstream-specific keys override root config values', () => {
    writeRootConfig({ model_profile: 'balanced', model_overrides: { 'gsd-executor': 'opus' } });
    writeWorkstreamConfig('feature-b', { model_profile: 'speed', model_overrides: { 'gsd-executor': 'haiku' } });
    process.env.GSD_WORKSTREAM = 'feature-b';
    const config = loadConfig(tmpDir);
    assert.strictEqual(config.model_profile, 'speed');
    assert.deepStrictEqual(config.model_overrides, { 'gsd-executor': 'haiku' });
  });

  test('deep merge works for nested workflow.* keys', () => {
    writeRootConfig({ workflow: { research: false, auto_advance: true } });
    writeWorkstreamConfig('feature-c', { workflow: { auto_advance: false } });
    process.env.GSD_WORKSTREAM = 'feature-c';
    const config = loadConfig(tmpDir);
    // research inherited from root
    assert.strictEqual(config.research, false);
    // auto_advance overridden by workstream
    assert.strictEqual(config.auto_advance, false);
  });

  test('explicit null in workstream config overrides root value (PR #2717 null-override bug)', () => {
    writeRootConfig({ model_overrides: { 'gsd-executor': 'opus', 'gsd-planner': 'sonnet' } });
    writeWorkstreamConfig('feature-d', { model_overrides: null });
    process.env.GSD_WORKSTREAM = 'feature-d';
    const config = loadConfig(tmpDir);
    // null in workstream should override root, not fall back to root value
    assert.strictEqual(config.model_overrides, null);
  });

  test('workstream without config.json inherits root config', () => {
    writeRootConfig({ model_profile: 'quality', model_overrides: { 'gsd-executor': 'opus' } });
    // Create workstream dir without config.json
    fs.mkdirSync(path.join(tmpDir, '.planning', 'workstreams', 'feature-e'), { recursive: true });
    process.env.GSD_WORKSTREAM = 'feature-e';
    const config = loadConfig(tmpDir);
    assert.strictEqual(config.model_profile, 'quality');
    assert.deepStrictEqual(config.model_overrides, { 'gsd-executor': 'opus' });
  });

  test('loadConfig does not mutate GSD_WORKSTREAM when workstream config is missing', () => {
    writeRootConfig({ model_profile: 'quality' });
    fs.mkdirSync(path.join(tmpDir, '.planning', 'workstreams', 'feature-f'), { recursive: true });
    process.env.GSD_WORKSTREAM = 'feature-f';

    const config = loadConfig(tmpDir);

    assert.strictEqual(config.model_profile, 'quality');
    assert.strictEqual(process.env.GSD_WORKSTREAM, 'feature-f');
  });
});

// ─── loadConfig commit_docs gitignore auto-detection (#1250) ──────────────────

describe('loadConfig commit_docs gitignore auto-detection (#1250)', () => {
  let tmpDir;

  beforeEach(() => {
    tmpDir = createTempGitProject();
  });

  afterEach(() => {
    cleanup(tmpDir);
  });

  function writeConfig(obj) {
    fs.writeFileSync(
      path.join(tmpDir, '.planning', 'config.json'),
      JSON.stringify(obj, null, 2)
    );
  }

  test('commit_docs defaults to false when .planning/ is gitignored and no explicit config', () => {
    fs.writeFileSync(path.join(tmpDir, '.gitignore'), '.planning/\n');
    // No commit_docs in config — should auto-detect
    writeConfig({ model_profile: 'balanced' });
    const config = loadConfig(tmpDir);
    assert.strictEqual(config.commit_docs, false,
      'commit_docs should be false when .planning/ is gitignored and not explicitly set');
  });

  test('commit_docs defaults to true when .planning/ is NOT gitignored and no explicit config', () => {
    // No .gitignore, no commit_docs in config
    writeConfig({ model_profile: 'balanced' });
    const config = loadConfig(tmpDir);
    assert.strictEqual(config.commit_docs, true,
      'commit_docs should default to true when .planning/ is not gitignored');
  });

  test('explicit commit_docs: false is respected even when .planning/ is not gitignored', () => {
    writeConfig({ commit_docs: false });
    const config = loadConfig(tmpDir);
    assert.strictEqual(config.commit_docs, false);
  });

  test('explicit commit_docs: true is respected even when .planning/ is gitignored', () => {
    fs.writeFileSync(path.join(tmpDir, '.gitignore'), '.planning/\n');
    writeConfig({ commit_docs: true });
    const config = loadConfig(tmpDir);
    assert.strictEqual(config.commit_docs, true,
      'explicit commit_docs: true should override gitignore auto-detection');
  });

  test('commit_docs auto-detect works with no config.json', () => {
    // Remove config.json so loadConfig uses defaults
    try { fs.unlinkSync(path.join(tmpDir, '.planning', 'config.json')); } catch {}
    fs.writeFileSync(path.join(tmpDir, '.gitignore'), '.planning/\n');
    const config = loadConfig(tmpDir);
    // When config.json is missing, loadConfig catches and returns defaults.
    // The gitignore check happens inside the try block, so with no config.json
    // the catch returns defaults (commit_docs: true). This is acceptable since
    // a project without config.json hasn't been initialized by GSD yet.
    assert.strictEqual(typeof config.commit_docs, 'boolean');
  });
});

// ─── resolveModelInternal ──────────────────────────────────────────────────────

describe('resolveModelInternal', () => {
  let tmpDir;

  beforeEach(() => {
    tmpDir = createTempProject();
  });

  afterEach(() => {
    cleanup(tmpDir);
  });

  function writeConfig(obj) {
    fs.writeFileSync(
      path.join(tmpDir, '.planning', 'config.json'),
      JSON.stringify(obj, null, 2)
    );
  }

  describe('model profile structural validation', () => {
    test('all known agents resolve to a valid string for each profile', () => {
      const knownAgents = ['gsd-planner', 'gsd-executor', 'gsd-phase-researcher', 'gsd-codebase-mapper'];
      const profiles = ['quality', 'balanced', 'budget', 'inherit'];
      const validValues = ['inherit', 'sonnet', 'haiku', 'opus'];

      for (const profile of profiles) {
        writeConfig({ model_profile: profile });
        for (const agent of knownAgents) {
          const result = resolveModelInternal(tmpDir, agent);
          assert.ok(
            validValues.includes(result),
            `profile=${profile} agent=${agent} returned unexpected value: ${result}`
          );
        }
      }
    });

    test('inherit profile forces all known agents to inherit model', () => {
      const knownAgents = ['gsd-planner', 'gsd-executor', 'gsd-phase-researcher', 'gsd-codebase-mapper'];
      writeConfig({ model_profile: 'inherit' });
      for (const agent of knownAgents) {
        assert.strictEqual(resolveModelInternal(tmpDir, agent), 'inherit');
      }
    });
  });

  describe('override precedence', () => {
    test('per-agent override takes precedence over profile', () => {
      writeConfig({
        model_profile: 'balanced',
        model_overrides: { 'gsd-executor': 'haiku' },
      });
      assert.strictEqual(resolveModelInternal(tmpDir, 'gsd-executor'), 'haiku');
    });

    test('opus override resolves to opus', () => {
      writeConfig({
        model_overrides: { 'gsd-executor': 'opus' },
      });
      assert.strictEqual(resolveModelInternal(tmpDir, 'gsd-executor'), 'opus');
    });

    test('agents not in override fall back to profile', () => {
      writeConfig({
        model_profile: 'quality',
        model_overrides: { 'gsd-executor': 'haiku' },
      });
      // gsd-planner not overridden, should use quality profile -> opus
      assert.strictEqual(resolveModelInternal(tmpDir, 'gsd-planner'), 'opus');
    });
  });

  describe('edge cases', () => {
    test('returns sonnet for unknown agent type', () => {
      writeConfig({ model_profile: 'balanced' });
      assert.strictEqual(resolveModelInternal(tmpDir, 'gsd-nonexistent'), 'sonnet');
    });

    test('returns opus for unknown agent type with quality profile', () => {
      writeConfig({ model_profile: 'quality' });
      assert.strictEqual(resolveModelInternal(tmpDir, 'gsd-nonexistent'), 'opus');
    });

    test('returns haiku for unknown agent type with budget profile', () => {
      writeConfig({ model_profile: 'budget' });
      assert.strictEqual(resolveModelInternal(tmpDir, 'gsd-nonexistent'), 'haiku');
    });

    test('returns inherit for unknown agent type with inherit profile', () => {
      writeConfig({ model_profile: 'inherit' });
      assert.strictEqual(resolveModelInternal(tmpDir, 'gsd-nonexistent'), 'inherit');
    });

    test('defaults to balanced profile when model_profile missing', () => {
      writeConfig({});
      // balanced profile, gsd-planner -> opus
      assert.strictEqual(resolveModelInternal(tmpDir, 'gsd-planner'), 'opus');
    });
  });

  describe('resolve_model_ids: "omit"', () => {
    test('returns empty string for known agents', () => {
      writeConfig({ resolve_model_ids: 'omit' });
      assert.strictEqual(resolveModelInternal(tmpDir, 'gsd-planner'), '');
    });

    test('returns empty string for unknown agents', () => {
      writeConfig({ resolve_model_ids: 'omit' });
      assert.strictEqual(resolveModelInternal(tmpDir, 'gsd-nonexistent'), '');
    });

    test('still respects model_overrides even when omit', () => {
      writeConfig({
        resolve_model_ids: 'omit',
        model_overrides: { 'gsd-planner': 'openai/gpt-5.4' },
      });
      assert.strictEqual(resolveModelInternal(tmpDir, 'gsd-planner'), 'openai/gpt-5.4');
    });

    test('returns empty string with inherit profile', () => {
      writeConfig({ resolve_model_ids: 'omit', model_profile: 'inherit' });
      assert.strictEqual(resolveModelInternal(tmpDir, 'gsd-planner'), '');
    });
  });

  describe('resolve_model_ids: true', () => {
    // Regression test for #2712: MODEL_ALIAS_MAP must track current model releases.
    test('opus alias resolves to claude-opus-4-7', () => {
      writeConfig({ resolve_model_ids: true, model_profile: 'quality' });
      assert.strictEqual(resolveModelInternal(tmpDir, 'gsd-planner'), 'claude-opus-4-7');
    });

    test('sonnet alias resolves to claude-sonnet-4-6', () => {
      writeConfig({ resolve_model_ids: true, model_profile: 'balanced' });
      assert.strictEqual(resolveModelInternal(tmpDir, 'gsd-executor'), 'claude-sonnet-4-6');
    });

    test('haiku alias resolves to claude-haiku-4-5', () => {
      writeConfig({ resolve_model_ids: true, model_profile: 'budget' });
      assert.strictEqual(resolveModelInternal(tmpDir, 'gsd-codebase-mapper'), 'claude-haiku-4-5');
    });
  });
});

// ─── escapeRegex ───────────────────────────────────────────────────────────────

describe('escapeRegex', () => {
  test('escapes dots', () => {
    assert.strictEqual(escapeRegex('file.txt'), 'file\\.txt');
  });

  test('escapes all special regex characters', () => {
    const input = '1.0 (alpha) [test] {ok} $100 ^start end$ a+b a*b a?b pipe|or back\\slash';
    const result = escapeRegex(input);
    // Verify each special char is escaped
    assert.ok(result.includes('\\.'));
    assert.ok(result.includes('\\('));
    assert.ok(result.includes('\\)'));
    assert.ok(result.includes('\\['));
    assert.ok(result.includes('\\]'));
    assert.ok(result.includes('\\{'));
    assert.ok(result.includes('\\}'));
    assert.ok(result.includes('\\$'));
    assert.ok(result.includes('\\^'));
    assert.ok(result.includes('\\+'));
    assert.ok(result.includes('\\*'));
    assert.ok(result.includes('\\?'));
    assert.ok(result.includes('\\|'));
    assert.ok(result.includes('\\\\'));
  });

  test('handles empty string', () => {
    assert.strictEqual(escapeRegex(''), '');
  });

  test('returns plain string unchanged', () => {
    assert.strictEqual(escapeRegex('hello'), 'hello');
  });
});

// ─── generateSlugInternal ──────────────────────────────────────────────────────

describe('generateSlugInternal', () => {
  test('converts text to lowercase kebab-case', () => {
    assert.strictEqual(generateSlugInternal('Hello World'), 'hello-world');
  });

  test('removes special characters', () => {
    assert.strictEqual(generateSlugInternal('core.cjs Tests!'), 'core-cjs-tests');
  });

  test('trims leading and trailing hyphens', () => {
    assert.strictEqual(generateSlugInternal('---hello---'), 'hello');
  });

  test('returns null for null input', () => {
    assert.strictEqual(generateSlugInternal(null), null);
  });

  test('returns null for empty string', () => {
    assert.strictEqual(generateSlugInternal(''), null);
  });

  test('strips newlines and control characters', () => {
    assert.strictEqual(generateSlugInternal('hello\nworld'), 'hello-world');
    assert.strictEqual(generateSlugInternal('tab\there'), 'tab-here');
  });

  test('truncates to 60 characters', () => {
    const long = 'a'.repeat(100);
    const result = generateSlugInternal(long);
    assert.ok(result.length <= 60, `slug should be <=60 chars, got ${result.length}`);
  });
});

// ─── normalizePhaseName / comparePhaseNum ──────────────────────────────────────
// NOTE: Comprehensive tests for normalizePhaseName and comparePhaseNum are in
// phase.test.cjs (which covers all edge cases: hybrid, letter-suffix,
// multi-level decimal, case-insensitive, directory-slug, and full sort order).
// Removed duplicates here to keep a single authoritative test location.

// ─── pathExistsInternal ────────────────────────────────────────────────────────

describe('pathExistsInternal', () => {
  let tmpDir;

  beforeEach(() => {
    tmpDir = createTempProject();
  });

  afterEach(() => {
    cleanup(tmpDir);
  });

  test('returns true for existing path', () => {
    assert.strictEqual(pathExistsInternal(tmpDir, '.planning'), true);
  });

  test('returns false for non-existing path', () => {
    assert.strictEqual(pathExistsInternal(tmpDir, 'nonexistent'), false);
  });

  test('handles absolute paths', () => {
    assert.strictEqual(pathExistsInternal(tmpDir, tmpDir), true);
  });
});

// ─── getMilestoneInfo ──────────────────────────────────────────────────────────

describe('getMilestoneInfo', () => {
  let tmpDir;

  beforeEach(() => {
    tmpDir = createTempProject();
  });

  afterEach(() => {
    cleanup(tmpDir);
  });

  test('extracts version and name from roadmap', () => {
    fs.writeFileSync(
      path.join(tmpDir, '.planning', 'ROADMAP.md'),
      '# Roadmap\n\n## Roadmap v1.2: My Cool Project\n\nSome content'
    );
    const info = getMilestoneInfo(tmpDir);
    assert.strictEqual(info.version, 'v1.2');
    assert.strictEqual(info.name, 'My Cool Project');
  });

  test('returns defaults when roadmap missing', () => {
    const info = getMilestoneInfo(tmpDir);
    assert.strictEqual(info.version, 'v1.0');
    assert.strictEqual(info.name, 'milestone');
  });

  test('returns active milestone when shipped milestone is collapsed in details block', () => {
    const roadmap = [
      '# Milestones',
      '',
      '| Version | Status |',
      '|---------|--------|',
      '| v0.1    | Shipped |',
      '| v0.2    | Active |',
      '',
      '<details>',
      '<summary>v0.1 — Legacy Feature Parity (Shipped)</summary>',
      '',
      '## Roadmap v0.1: Legacy Feature Parity',
      '',
      '### Phase 1: Core Setup',
      'Some content about phase 1',
      '',
      '</details>',
      '',
      '## Roadmap v0.2: Dashboard Overhaul',
      '',
      '### Phase 8: New Dashboard Layout',
      'Some content about phase 8',
    ].join('\n');
    fs.writeFileSync(path.join(tmpDir, '.planning', 'ROADMAP.md'), roadmap);
    const info = getMilestoneInfo(tmpDir);
    assert.strictEqual(info.version, 'v0.2');
    assert.strictEqual(info.name, 'Dashboard Overhaul');
  });

  test('returns active milestone when multiple shipped milestones exist in details blocks', () => {
    const roadmap = [
      '# Milestones',
      '',
      '| Version | Status |',
      '|---------|--------|',
      '| v0.1    | Shipped |',
      '| v0.2    | Shipped |',
      '| v0.3    | Active |',
      '',
      '<details>',
      '<summary>v0.1 — Initial Release (Shipped)</summary>',
      '',
      '## Roadmap v0.1: Initial Release',
      '',
      '</details>',
      '',
      '<details>',
      '<summary>v0.2 — Feature Expansion (Shipped)</summary>',
      '',
      '## Roadmap v0.2: Feature Expansion',
      '',
      '</details>',
      '',
      '## Roadmap v0.3: Performance Tuning',
      '',
      '### Phase 12: Optimize Queries',
    ].join('\n');
    fs.writeFileSync(path.join(tmpDir, '.planning', 'ROADMAP.md'), roadmap);
    const info = getMilestoneInfo(tmpDir);
    assert.strictEqual(info.version, 'v0.3');
    assert.strictEqual(info.name, 'Performance Tuning');
  });

  test('returns defaults when roadmap has no heading matches', () => {
    fs.writeFileSync(
      path.join(tmpDir, '.planning', 'ROADMAP.md'),
      '# Roadmap\n\nSome content without version headings'
    );
    const info = getMilestoneInfo(tmpDir);
    assert.strictEqual(info.version, 'v1.0');
    assert.strictEqual(info.name, 'milestone');
  });

  // Bug #2409: getMilestoneInfo must prefer STATE.md milestone: field over regex matching
  test('uses STATE.md milestone frontmatter when 🚧 is inside <summary> tag without bold (bug #2409)', () => {
    // STATE.md says v2.9, ROADMAP has 🚧 v2.9 inside <summary> (not bolded) — no bold regex match
    const roadmap = [
      '# Milestones',
      '',
      '- ✅ v2.2 Old Features — shipped 2026-04-03',
      '- 🚧 v2.9 Full-Pass Verification',
      '',
      '<details>',
      '<summary>🚧 v2.9 Full-Pass Verification & Bug Fixing — IN PROGRESS</summary>',
      '',
      '## Roadmap v2.9: Full-Pass Verification & Bug Fixing',
      '',
      '### Phase 1: Verification',
      '',
      '</details>',
      '',
      '## Phase Details (v2.2 — Old Features)',
      '',
      '### Phase 1: Old Stuff',
    ].join('\n');
    fs.writeFileSync(path.join(tmpDir, '.planning', 'ROADMAP.md'), roadmap);
    fs.writeFileSync(
      path.join(tmpDir, '.planning', 'STATE.md'),
      '---\nmilestone: v2.9\n---\n\n# State\n'
    );

    const info = getMilestoneInfo(tmpDir);
    assert.strictEqual(info.version, 'v2.9',
      'should return v2.9 from STATE.md, not v2.2 from a stale heading match');
    assert.ok(info.name.includes('Full-Pass') || info.name.includes('Verification'),
      `name should reference the v2.9 milestone, got: "${info.name}"`);
  });

  test('STATE.md milestone takes precedence over first ## heading match (bug #2409)', () => {
    // ROADMAP with multiple ## headings — without STATE.md anchoring, first match wins
    const roadmap = [
      '## Phase Details (v1.5–v2.1)',
      '',
      '## Roadmap v2.2: Old Milestone',
      '',
      '## Roadmap v2.9: Current Milestone',
      '',
      '### Phase 1: Alpha',
    ].join('\n');
    fs.writeFileSync(path.join(tmpDir, '.planning', 'ROADMAP.md'), roadmap);
    fs.writeFileSync(
      path.join(tmpDir, '.planning', 'STATE.md'),
      '---\nmilestone: v2.9\n---\n\n# State\n'
    );

    const info = getMilestoneInfo(tmpDir);
    assert.strictEqual(info.version, 'v2.9',
      'should read v2.9 from STATE.md, not v2.2 from first ## heading');
    assert.strictEqual(info.name, 'Current Milestone');
  });

  // Bug found in code review of PR #2458: stateVersion early-return doesn't check if shipped
  test('falls through to new active milestone when STATE.md version is already shipped (✅ heading)', () => {
    // STATE.md still says v1.0 (stale), but v1.0 is marked ✅ in ROADMAP.md.
    // getMilestoneInfo must NOT return v1.0; it must fall through and detect v2.0.
    const roadmap = [
      '## v1.0 ✅ Initial Release: Done',
      '',
      '### Phase 1: Setup',
      '',
      '## v2.0: Active Milestone',
      '',
      '### Phase 2: Build',
    ].join('\n');
    fs.writeFileSync(path.join(tmpDir, '.planning', 'ROADMAP.md'), roadmap);
    fs.writeFileSync(
      path.join(tmpDir, '.planning', 'STATE.md'),
      '---\nmilestone: v1.0\n---\n\n# State\n'
    );

    const info = getMilestoneInfo(tmpDir);
    assert.strictEqual(info.version, 'v2.0',
      'should return v2.0 (active milestone), not v1.0 (stale shipped milestone from STATE.md)');
    assert.strictEqual(info.name, 'Active Milestone');
  });

  test('falls through when STATE.md version matches ✅ heading in alternate position formats', () => {
    // ✅ can appear before the version: ## ✅ v1.0 Old Name
    const roadmap = [
      '## ✅ v1.0 Old Name',
      '',
      '## v2.0: New Stuff',
    ].join('\n');
    fs.writeFileSync(path.join(tmpDir, '.planning', 'ROADMAP.md'), roadmap);
    fs.writeFileSync(
      path.join(tmpDir, '.planning', 'STATE.md'),
      '---\nmilestone: v1.0\n---\n\n# State\n'
    );

    const info = getMilestoneInfo(tmpDir);
    assert.strictEqual(info.version, 'v2.0',
      'should return v2.0, not stale v1.0 with ✅ prefix in heading');
    assert.strictEqual(info.name, 'New Stuff');
  });
});

// ─── searchPhaseInDir ──────────────────────────────────────────────────────────

describe('searchPhaseInDir', () => {
  let tmpDir;
  let phasesDir;

  beforeEach(() => {
    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'gsd-core-test-'));
    phasesDir = path.join(tmpDir, 'phases');
    fs.mkdirSync(phasesDir, { recursive: true });
  });

  afterEach(() => {
    cleanup(tmpDir);
  });

  test('finds phase directory by normalized prefix', () => {
    fs.mkdirSync(path.join(phasesDir, '01-foundation'));
    const result = searchPhaseInDir(phasesDir, '.planning/phases', '01');
    assert.strictEqual(result.found, true);
    assert.strictEqual(result.phase_number, '01');
    assert.strictEqual(result.phase_name, 'foundation');
  });

  test('returns plans and summaries', () => {
    const phaseDir = path.join(phasesDir, '01-foundation');
    fs.mkdirSync(phaseDir);
    fs.writeFileSync(path.join(phaseDir, '01-01-PLAN.md'), '# Plan');
    fs.writeFileSync(path.join(phaseDir, '01-01-SUMMARY.md'), '# Summary');
    const result = searchPhaseInDir(phasesDir, '.planning/phases', '01');
    assert.ok(result.plans.includes('01-01-PLAN.md'));
    assert.ok(result.summaries.includes('01-01-SUMMARY.md'));
    assert.strictEqual(result.incomplete_plans.length, 0);
  });

  test('identifies incomplete plans', () => {
    const phaseDir = path.join(phasesDir, '01-foundation');
    fs.mkdirSync(phaseDir);
    fs.writeFileSync(path.join(phaseDir, '01-01-PLAN.md'), '# Plan 1');
    fs.writeFileSync(path.join(phaseDir, '01-02-PLAN.md'), '# Plan 2');
    fs.writeFileSync(path.join(phaseDir, '01-01-SUMMARY.md'), '# Summary 1');
    const result = searchPhaseInDir(phasesDir, '.planning/phases', '01');
    assert.strictEqual(result.incomplete_plans.length, 1);
    assert.ok(result.incomplete_plans.includes('01-02-PLAN.md'));
  });

  test('treats prefix summary as complete for descriptive plan filename (#3101)', () => {
    const phaseDir = path.join(phasesDir, '01-foundation');
    fs.mkdirSync(phaseDir);
    fs.writeFileSync(path.join(phaseDir, '01-01-auth-hardening-PLAN.md'), '# Plan 1');
    fs.writeFileSync(path.join(phaseDir, '01-01-SUMMARY.md'), '# Summary 1');

    const result = searchPhaseInDir(phasesDir, '.planning/phases', '01');
    assert.strictEqual(result.incomplete_plans.length, 0);
  });

  test('detects research and context files', () => {
    const phaseDir = path.join(phasesDir, '01-foundation');
    fs.mkdirSync(phaseDir);
    fs.writeFileSync(path.join(phaseDir, '01-RESEARCH.md'), '# Research');
    fs.writeFileSync(path.join(phaseDir, '01-CONTEXT.md'), '# Context');
    const result = searchPhaseInDir(phasesDir, '.planning/phases', '01');
    assert.strictEqual(result.has_research, true);
    assert.strictEqual(result.has_context, true);
  });

  test('returns null when phase not found', () => {
    fs.mkdirSync(path.join(phasesDir, '01-foundation'));
    const result = searchPhaseInDir(phasesDir, '.planning/phases', '99');
    assert.strictEqual(result, null);
  });

  test('generates phase_slug from directory name', () => {
    fs.mkdirSync(path.join(phasesDir, '01-core-cjs-tests'));
    const result = searchPhaseInDir(phasesDir, '.planning/phases', '01');
    assert.strictEqual(result.phase_slug, 'core-cjs-tests');
  });
});

// ─── findPhaseInternal ─────────────────────────────────────────────────────────

describe('findPhaseInternal', () => {
  let tmpDir;

  beforeEach(() => {
    tmpDir = createTempProject();
  });

  afterEach(() => {
    cleanup(tmpDir);
  });

  test('finds phase in current phases directory', () => {
    fs.mkdirSync(path.join(tmpDir, '.planning', 'phases', '01-foundation'));
    const result = findPhaseInternal(tmpDir, '1');
    assert.strictEqual(result.found, true);
    assert.strictEqual(result.phase_number, '01');
  });

  test('returns null for non-existent phase', () => {
    const result = findPhaseInternal(tmpDir, '99');
    assert.strictEqual(result, null);
  });

  test('returns null for null phase', () => {
    const result = findPhaseInternal(tmpDir, null);
    assert.strictEqual(result, null);
  });

  test('searches archived milestones when not in current', () => {
    // Create archived milestone structure (no current phase match)
    const archiveDir = path.join(tmpDir, '.planning', 'milestones', 'v1.0-phases', '01-foundation');
    fs.mkdirSync(archiveDir, { recursive: true });
    const result = findPhaseInternal(tmpDir, '1');
    assert.strictEqual(result.found, true);
    assert.strictEqual(result.archived, 'v1.0');
  });
});

// ─── getRoadmapPhaseInternal ───────────────────────────────────────────────────

describe('getRoadmapPhaseInternal', () => {
  let tmpDir;

  beforeEach(() => {
    tmpDir = createTempProject();
  });

  afterEach(() => {
    cleanup(tmpDir);
  });

  // Bug: getRoadmapPhaseInternal was missing from module.exports
  test('is exported from core.cjs (REG-02)', () => {
    assert.strictEqual(typeof getRoadmapPhaseInternal, 'function');
    // Also verify it works with a real roadmap (note: goal regex expects **Goal:** with colon inside bold)
    fs.writeFileSync(
      path.join(tmpDir, '.planning', 'ROADMAP.md'),
      '### Phase 1: Foundation\n**Goal:** Build the base\n'
    );
    const result = getRoadmapPhaseInternal(tmpDir, '1');
    assert.strictEqual(result.found, true);
    assert.strictEqual(result.phase_name, 'Foundation');
    assert.strictEqual(result.goal, 'Build the base');
  });

  test('extracts phase name and goal from roadmap', () => {
    fs.writeFileSync(
      path.join(tmpDir, '.planning', 'ROADMAP.md'),
      '### Phase 2: API Layer\n**Goal:** Create REST endpoints\n**Depends on**: Phase 1\n'
    );
    const result = getRoadmapPhaseInternal(tmpDir, '2');
    assert.strictEqual(result.phase_name, 'API Layer');
    assert.strictEqual(result.goal, 'Create REST endpoints');
  });

  test('returns goal when Goal uses colon-outside-bold format', () => {
    // **Goal**: (colon outside bold) is now supported alongside **Goal:**
    fs.writeFileSync(
      path.join(tmpDir, '.planning', 'ROADMAP.md'),
      '### Phase 1: Foundation\n**Goal**: Build the base\n'
    );
    const result = getRoadmapPhaseInternal(tmpDir, '1');
    assert.strictEqual(result.found, true);
    assert.strictEqual(result.phase_name, 'Foundation');
    assert.strictEqual(result.goal, 'Build the base');
  });

  test('returns null when roadmap missing', () => {
    const result = getRoadmapPhaseInternal(tmpDir, '1');
    assert.strictEqual(result, null);
  });

  test('returns null when phase not in roadmap', () => {
    fs.writeFileSync(
      path.join(tmpDir, '.planning', 'ROADMAP.md'),
      '### Phase 1: Foundation\n**Goal**: Build the base\n'
    );
    const result = getRoadmapPhaseInternal(tmpDir, '99');
    assert.strictEqual(result, null);
  });

  test('returns null for null phase number', () => {
    const result = getRoadmapPhaseInternal(tmpDir, null);
    assert.strictEqual(result, null);
  });

  test('extracts full section text', () => {
    fs.writeFileSync(
      path.join(tmpDir, '.planning', 'ROADMAP.md'),
      '### Phase 1: Foundation\n**Goal**: Build the base\n**Requirements**: TEST-01\nSome details here\n\n### Phase 2: API\n**Goal**: REST\n'
    );
    const result = getRoadmapPhaseInternal(tmpDir, '1');
    assert.ok(result.section.includes('Phase 1: Foundation'));
    assert.ok(result.section.includes('Some details here'));
    // Should not include Phase 2 content
    assert.ok(!result.section.includes('Phase 2: API'));
  });

  // Bug #2391: zero-padded phase numbers ("03") must match unpadded ROADMAP headings ("Phase 3:")
  test('matches zero-padded phase number against unpadded ROADMAP heading (bug #2391)', () => {
    fs.writeFileSync(
      path.join(tmpDir, '.planning', 'ROADMAP.md'),
      '### Phase 3: Rotation Engine\n**Goal**: Build rotation\n**Requirements**: ROTA-01\n'
    );
    const result = getRoadmapPhaseInternal(tmpDir, '03');
    assert.ok(result !== null, 'should find the phase with zero-padded input "03"');
    assert.strictEqual(result.found, true);
    assert.strictEqual(result.phase_name, 'Rotation Engine');
    assert.strictEqual(result.goal, 'Build rotation');
  });

  test('matches double-zero-padded phase number against unpadded ROADMAP heading (bug #2391)', () => {
    fs.writeFileSync(
      path.join(tmpDir, '.planning', 'ROADMAP.md'),
      '### Phase 7: Final\n**Goal**: Ship it\n'
    );
    const result = getRoadmapPhaseInternal(tmpDir, '007');
    assert.ok(result !== null, 'should find the phase with "007"');
    assert.strictEqual(result.found, true);
    assert.strictEqual(result.phase_name, 'Final');
  });

  test('unpadded lookup still works after fix (regression check)', () => {
    fs.writeFileSync(
      path.join(tmpDir, '.planning', 'ROADMAP.md'),
      '### Phase 3: Rotation Engine\n**Goal**: Build rotation\n'
    );
    const result = getRoadmapPhaseInternal(tmpDir, '3');
    assert.ok(result !== null);
    assert.strictEqual(result.found, true);
    assert.strictEqual(result.phase_name, 'Rotation Engine');
  });
});

// ─── getMilestonePhaseFilter ────────────────────────────────────────────────────

describe('getMilestonePhaseFilter', () => {
  let tmpDir;

  beforeEach(() => {
    tmpDir = createTempProject();
  });

  afterEach(() => {
    cleanup(tmpDir);
  });

  test('filters directories to only current milestone phases', () => {
    // ROADMAP lists only phases 5-7
    fs.writeFileSync(
      path.join(tmpDir, '.planning', 'ROADMAP.md'),
      [
        '## Roadmap v2.0: Next Release',
        '',
        '### Phase 5: Auth',
        '**Goal:** Add authentication',
        '',
        '### Phase 6: Dashboard',
        '**Goal:** Build dashboard',
        '',
        '### Phase 7: Polish',
        '**Goal:** Final polish',
      ].join('\n')
    );

    // Create phase dirs 1-7 on disk (leftover from previous milestones)
    for (let i = 1; i <= 7; i++) {
      const padded = String(i).padStart(2, '0');
      fs.mkdirSync(path.join(tmpDir, '.planning', 'phases', `${padded}-phase-${i}`));
    }

    const filter = getMilestonePhaseFilter(tmpDir);

    // Only phases 5, 6, 7 should match
    assert.strictEqual(filter('05-auth'), true);
    assert.strictEqual(filter('06-dashboard'), true);
    assert.strictEqual(filter('07-polish'), true);

    // Phases 1-4 should NOT match
    assert.strictEqual(filter('01-phase-1'), false);
    assert.strictEqual(filter('02-phase-2'), false);
    assert.strictEqual(filter('03-phase-3'), false);
    assert.strictEqual(filter('04-phase-4'), false);
  });

  test('returns pass-all filter when ROADMAP.md is missing', () => {
    const filter = getMilestonePhaseFilter(tmpDir);

    assert.strictEqual(filter('01-foundation'), true);
    assert.strictEqual(filter('99-anything'), true);
  });

  test('returns pass-all filter when ROADMAP has no phase headings', () => {
    fs.writeFileSync(
      path.join(tmpDir, '.planning', 'ROADMAP.md'),
      '# Roadmap\n\nSome content without phases.\n'
    );

    const filter = getMilestonePhaseFilter(tmpDir);

    assert.strictEqual(filter('01-foundation'), true);
    assert.strictEqual(filter('05-api'), true);
  });

  test('handles letter-suffix phases (e.g. 3A)', () => {
    fs.writeFileSync(
      path.join(tmpDir, '.planning', 'ROADMAP.md'),
      '### Phase 3A: Sub-feature\n**Goal:** Sub work\n'
    );

    const filter = getMilestonePhaseFilter(tmpDir);

    assert.strictEqual(filter('03A-sub-feature'), true);
    assert.strictEqual(filter('03-main'), false);
    assert.strictEqual(filter('04-other'), false);
  });

  test('handles decimal phases (e.g. 5.1)', () => {
    fs.writeFileSync(
      path.join(tmpDir, '.planning', 'ROADMAP.md'),
      '### Phase 5: Main\n**Goal:** Main work\n\n### Phase 5.1: Patch\n**Goal:** Patch work\n'
    );

    const filter = getMilestonePhaseFilter(tmpDir);

    assert.strictEqual(filter('05-main'), true);
    assert.strictEqual(filter('05.1-patch'), true);
    assert.strictEqual(filter('04-other'), false);
  });

  test('returns false for non-phase directory names', () => {
    fs.writeFileSync(
      path.join(tmpDir, '.planning', 'ROADMAP.md'),
      '### Phase 1: Init\n**Goal:** Start\n'
    );

    const filter = getMilestonePhaseFilter(tmpDir);

    assert.strictEqual(filter('not-a-phase'), false);
    assert.strictEqual(filter('.gitkeep'), false);
  });

  test('phaseCount reflects ROADMAP phase count', () => {
    fs.writeFileSync(
      path.join(tmpDir, '.planning', 'ROADMAP.md'),
      '### Phase 5: Auth\n### Phase 6: Dashboard\n### Phase 7: Polish\n'
    );

    const filter = getMilestonePhaseFilter(tmpDir);
    assert.strictEqual(filter.phaseCount, 3);
  });

  test('phaseCount is 0 when ROADMAP is missing', () => {
    const filter = getMilestonePhaseFilter(tmpDir);
    assert.strictEqual(filter.phaseCount, 0);
  });

  test('phaseCount is 0 when ROADMAP has no phase headings', () => {
    fs.writeFileSync(
      path.join(tmpDir, '.planning', 'ROADMAP.md'),
      '# Roadmap\n\nSome content.\n'
    );

    const filter = getMilestonePhaseFilter(tmpDir);
    assert.strictEqual(filter.phaseCount, 0);
  });
});

// ─── Stale hook filter regression (#1200) ─────────────────────────────────────

describe('stale hook filter', () => {
  test('filter should only match gsd-prefixed .js files', () => {
    const files = [
      'gsd-check-update.js',
      'gsd-context-monitor.js',
      'gsd-prompt-guard.js',
      'gsd-statusline.js',
      'gsd-workflow-guard.js',
      'guard-edits-outside-project.js',  // user hook
      'my-custom-hook.js',               // user hook
      'gsd-check-update.js.bak',         // backup file
      'README.md',                       // non-js file
    ];

    const gsdFilter = f => f.startsWith('gsd-') && f.endsWith('.js');
    const filtered = files.filter(gsdFilter);

    assert.deepStrictEqual(filtered, [
      'gsd-check-update.js',
      'gsd-context-monitor.js',
      'gsd-prompt-guard.js',
      'gsd-statusline.js',
      'gsd-workflow-guard.js',
    ], 'should only include gsd-prefixed .js files');

    assert.ok(!filtered.includes('guard-edits-outside-project.js'), 'must not include user hooks');
    assert.ok(!filtered.includes('my-custom-hook.js'), 'must not include non-gsd hooks');
  });
});

// ─── stale hook path regression (#1249) ──────────────────────────────────────

describe('stale hook path', () => {
  test('gsd-check-update.js checks configDir/hooks/ where hooks are actually installed (#1421)', () => {
    // The stale-hook scan logic lives in the worker (moved from inline -e template literal).
    // The worker receives configDir via env and constructs the hooksDir path.
    const content = fs.readFileSync(
      path.join(__dirname, '..', 'hooks', 'gsd-check-update-worker.js'), 'utf-8'
    );
    // Hooks are installed at configDir/hooks/ (e.g. ~/.claude/hooks/),
    // not configDir/get-shit-done/hooks/ which doesn't exist (#1421)
    assert.ok(
      content.includes("path.join(configDir, 'hooks')"),
      'stale hook check must look in configDir/hooks/ where hooks are actually installed'
    );
  });
});

// ─── shared cache directory regression (#1421) ─────────────────────────────────

describe('shared cache directory (#1421)', () => {
  test('gsd-check-update.js writes cache to shared ~/.cache/gsd/ directory', () => {
    const content = fs.readFileSync(
      path.join(__dirname, '..', 'hooks', 'gsd-check-update.js'), 'utf-8'
    );
    // Cache must use a tool-agnostic path so statusline can find it
    // regardless of which runtime (Claude, Gemini, OpenCode) ran the check
    assert.ok(
      content.includes("path.join(homeDir, '.cache', 'gsd')"),
      'check-update must write cache to ~/.cache/gsd/ (shared, tool-agnostic)'
    );
  });

  test('gsd-statusline.js checks shared cache first, falls back to legacy (#1421)', () => {
    const content = fs.readFileSync(
      path.join(__dirname, '..', 'hooks', 'gsd-statusline.js'), 'utf-8'
    );
    // Statusline must check the shared cache path first
    assert.ok(
      content.includes("path.join(homeDir, '.cache', 'gsd', 'gsd-update-check.json')"),
      'statusline must check shared cache at ~/.cache/gsd/gsd-update-check.json'
    );
    // Must fall back to legacy runtime-specific cache for backward compat
    assert.ok(
      content.includes("path.join(claudeDir, 'cache', 'gsd-update-check.json')"),
      'statusline must fall back to legacy cache at claudeDir/cache/gsd-update-check.json'
    );
    // Shared cache must be checked before legacy (existsSync order matters)
    const sharedIdx = content.indexOf('sharedCacheFile');
    const legacyIdx = content.indexOf('legacyCacheFile');
    assert.ok(
      sharedIdx < legacyIdx,
      'shared cache must be defined and checked before legacy cache'
    );
  });
});

// ─── resolveWorktreeRoot ─────────────────────────────────────────────────────

describe('resolveWorktreeRoot', () => {
  const { resolveWorktreeRoot } = require('../get-shit-done/bin/lib/core.cjs');
  let tmpDir;

  beforeEach(() => {
    tmpDir = createTempProject();
  });

  afterEach(() => {
    cleanup(tmpDir);
  });

  test('returns cwd when not in a git repo', () => {
    assert.strictEqual(resolveWorktreeRoot(tmpDir), tmpDir);
  });

  test('returns cwd in a normal git repo (not a worktree)', () => {
    const { execSync: execSyncLocal } = require('child_process');
    execSyncLocal('git init', { cwd: tmpDir, stdio: 'pipe' });
    assert.strictEqual(resolveWorktreeRoot(tmpDir), tmpDir);
  });
});

// ─── resolveWorktreeRoot — linked worktree with .planning/ (#1315) ───────────

describe('resolveWorktreeRoot with linked worktree .planning/', () => {
  const { resolveWorktreeRoot } = require('../get-shit-done/bin/lib/core.cjs');
  const { execSync: execSyncLocal } = require('child_process');
  // On Windows CI, os.tmpdir() may return 8.3 short paths (RUNNER~1) while
  // git returns long paths (runneradmin). realpathSync.native resolves both.
  const normalizePath = (p) => {
    try { return fs.realpathSync.native(p); } catch { return fs.realpathSync(p); }
  };

  let mainDir;
  let worktreeDir;

  function initBareGitRepo() {
    const dir = normalizePath(fs.mkdtempSync(path.join(os.tmpdir(), 'gsd-wt-main-')));
    execSyncLocal('git init', { cwd: dir, stdio: 'pipe' });
    execSyncLocal('git config user.email "test@test.com"', { cwd: dir, stdio: 'pipe' });
    execSyncLocal('git config user.name "Test"', { cwd: dir, stdio: 'pipe' });
    execSyncLocal('git config commit.gpgsign false', { cwd: dir, stdio: 'pipe' });
    fs.writeFileSync(path.join(dir, 'README.md'), '# Main');
    execSyncLocal('git add -A', { cwd: dir, stdio: 'pipe' });
    execSyncLocal('git commit -m "initial"', { cwd: dir, stdio: 'pipe' });
    return dir;
  }

  beforeEach(() => {
    mainDir = initBareGitRepo();
    worktreeDir = null;
  });

  afterEach(() => {
    if (worktreeDir) {
      try { execSyncLocal(`git worktree remove "${worktreeDir}" --force`, { cwd: mainDir, stdio: 'pipe' }); } catch { /* ok */ }
      try { fs.rmSync(worktreeDir, { recursive: true, force: true }); } catch { /* ok */ }
    }
    cleanup(mainDir);
  });

  test('returns linked worktree cwd when it has its own .planning/', () => {
    // Add .planning/ to main repo
    fs.mkdirSync(path.join(mainDir, '.planning'), { recursive: true });

    // Create a linked worktree
    worktreeDir = normalizePath(fs.mkdtempSync(path.join(os.tmpdir(), 'gsd-wt-linked-')));
    fs.rmSync(worktreeDir, { recursive: true, force: true });
    execSyncLocal(`git worktree add "${worktreeDir}" -b test-linked`, { cwd: mainDir, stdio: 'pipe' });

    // Give the linked worktree its own .planning/
    fs.mkdirSync(path.join(worktreeDir, '.planning'), { recursive: true });

    // resolveWorktreeRoot should return the linked worktree dir, not the main repo
    const result = normalizePath(resolveWorktreeRoot(worktreeDir));
    assert.strictEqual(result, worktreeDir,
      'linked worktree with .planning/ should resolve to itself, not the main repo');
  });

  test('returns main repo root when linked worktree has no .planning/', () => {
    // Create a linked worktree (no .planning/ in main or worktree)
    worktreeDir = normalizePath(fs.mkdtempSync(path.join(os.tmpdir(), 'gsd-wt-linked-')));
    fs.rmSync(worktreeDir, { recursive: true, force: true });
    execSyncLocal(`git worktree add "${worktreeDir}" -b test-linked-no-plan`, { cwd: mainDir, stdio: 'pipe' });

    // resolveWorktreeRoot should return the main repo root
    const result = normalizePath(resolveWorktreeRoot(worktreeDir));
    const expected = normalizePath(mainDir);
    assert.strictEqual(result, expected,
      'linked worktree without .planning/ should resolve to main repo root');
  });
});

// ─── monorepo worktree CWD preservation (#1283) ─────────────────────────────

describe('monorepo worktree CWD preservation', () => {
  const { resolveWorktreeRoot } = require('../get-shit-done/bin/lib/core.cjs');
  let tmpDir;

  beforeEach(() => {
    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'gsd-monorepo-wt-'));
  });

  afterEach(() => {
    cleanup(tmpDir);
  });

  test('CWD with .planning/ skips worktree resolution (monorepo subdirectory)', () => {
    const subDir = path.join(tmpDir, 'service-alpha');
    fs.mkdirSync(path.join(subDir, '.planning'), { recursive: true });
    let cwd = subDir;
    if (!fs.existsSync(path.join(cwd, '.planning'))) {
      const worktreeRoot = resolveWorktreeRoot(cwd);
      if (worktreeRoot !== cwd) cwd = worktreeRoot;
    }
    assert.strictEqual(cwd, subDir, 'CWD with .planning/ must not be overridden by worktree resolution');
  });

  test('CWD without .planning/ still goes through worktree resolution', () => {
    let cwd = tmpDir;
    let worktreeResolutionCalled = false;
    if (!fs.existsSync(path.join(cwd, '.planning'))) {
      worktreeResolutionCalled = true;
      const worktreeRoot = resolveWorktreeRoot(cwd);
      if (worktreeRoot !== cwd) cwd = worktreeRoot;
    }
    assert.ok(worktreeResolutionCalled, 'worktree resolution must be called when .planning/ is absent');
  });
});

// ─── withPlanningLock ────────────────────────────────────────────────────────

describe('withPlanningLock', () => {
  const { withPlanningLock, planningDir } = require('../get-shit-done/bin/lib/core.cjs');
  let tmpDir;

  beforeEach(() => {
    tmpDir = createTempProject();
  });

  afterEach(() => {
    cleanup(tmpDir);
  });

  test('executes function and returns result', () => {
    const result = withPlanningLock(tmpDir, () => 42);
    assert.strictEqual(result, 42);
    // Lock file should be cleaned up
    assert.ok(!fs.existsSync(path.join(planningDir(tmpDir), '.lock')));
  });

  test('cleans up lock file even on error', () => {
    assert.throws(() => {
      withPlanningLock(tmpDir, () => { throw new Error('test'); });
    }, /test/);
    assert.ok(!fs.existsSync(path.join(planningDir(tmpDir), '.lock')));
  });

  test('recovers from stale lock (>30s old)', () => {
    const lockPath = path.join(tmpDir, '.planning', '.lock');
    // Create a stale lock
    fs.writeFileSync(lockPath, '{"pid":99999}');
    // Backdate the lock file by 31 seconds
    const staleTime = new Date(Date.now() - 31000);
    fs.utimesSync(lockPath, staleTime, staleTime);

    const result = withPlanningLock(tmpDir, () => 'recovered');
    assert.strictEqual(result, 'recovered');
  });
});

// ─── detectSubRepos ──────────────────────────────────────────────────────────

describe('detectSubRepos', () => {
  let projectRoot;

  beforeEach(() => {
    projectRoot = fs.mkdtempSync(path.join(os.tmpdir(), 'gsd-detect-test-'));
  });

  afterEach(() => {
    fs.rmSync(projectRoot, { recursive: true, force: true });
  });

  test('returns empty array when no child directories have .git', () => {
    fs.mkdirSync(path.join(projectRoot, 'src'));
    fs.mkdirSync(path.join(projectRoot, 'lib'));
    assert.deepStrictEqual(detectSubRepos(projectRoot), []);
  });

  test('detects directories with .git', () => {
    fs.mkdirSync(path.join(projectRoot, 'backend', '.git'), { recursive: true });
    fs.mkdirSync(path.join(projectRoot, 'frontend', '.git'), { recursive: true });
    fs.mkdirSync(path.join(projectRoot, 'scripts')); // no .git
    assert.deepStrictEqual(detectSubRepos(projectRoot), ['backend', 'frontend']);
  });

  test('returns sorted results', () => {
    fs.mkdirSync(path.join(projectRoot, 'zeta', '.git'), { recursive: true });
    fs.mkdirSync(path.join(projectRoot, 'alpha', '.git'), { recursive: true });
    fs.mkdirSync(path.join(projectRoot, 'mid', '.git'), { recursive: true });
    assert.deepStrictEqual(detectSubRepos(projectRoot), ['alpha', 'mid', 'zeta']);
  });

  test('skips hidden directories', () => {
    fs.mkdirSync(path.join(projectRoot, '.hidden', '.git'), { recursive: true });
    fs.mkdirSync(path.join(projectRoot, 'visible', '.git'), { recursive: true });
    assert.deepStrictEqual(detectSubRepos(projectRoot), ['visible']);
  });

  test('skips node_modules', () => {
    fs.mkdirSync(path.join(projectRoot, 'node_modules', '.git'), { recursive: true });
    fs.mkdirSync(path.join(projectRoot, 'app', '.git'), { recursive: true });
    assert.deepStrictEqual(detectSubRepos(projectRoot), ['app']);
  });
});

// ─── loadConfig sub_repos auto-sync ──────────────────────────────────────────

describe('loadConfig sub_repos auto-sync', () => {
  let projectRoot;

  beforeEach(() => {
    projectRoot = fs.mkdtempSync(path.join(os.tmpdir(), 'gsd-sync-test-'));
    fs.mkdirSync(path.join(projectRoot, '.planning'), { recursive: true });
  });

  afterEach(() => {
    fs.rmSync(projectRoot, { recursive: true, force: true });
  });

  test('migrates multiRepo: true to sub_repos array', () => {
    // Create config with legacy multiRepo flag
    fs.writeFileSync(
      path.join(projectRoot, '.planning', 'config.json'),
      JSON.stringify({ multiRepo: true, model_profile: 'quality' })
    );
    // Create sub-repos
    fs.mkdirSync(path.join(projectRoot, 'backend', '.git'), { recursive: true });
    fs.mkdirSync(path.join(projectRoot, 'frontend', '.git'), { recursive: true });

    const config = loadConfig(projectRoot);
    assert.deepStrictEqual(config.sub_repos, ['backend', 'frontend']);
    assert.strictEqual(config.commit_docs, false);

    // Verify config was persisted to the canonical location (planning.sub_repos per #2561/#2638)
    const saved = JSON.parse(fs.readFileSync(path.join(projectRoot, '.planning', 'config.json'), 'utf-8'));
    assert.deepStrictEqual(saved.planning?.sub_repos, ['backend', 'frontend']);
    assert.strictEqual(saved.sub_repos, undefined, 'top-level sub_repos should not be written (#2638)');
    assert.strictEqual(saved.multiRepo, undefined, 'multiRepo should be removed');
  });

  test('adds newly detected repos to sub_repos', () => {
    fs.mkdirSync(path.join(projectRoot, 'backend', '.git'), { recursive: true });
    fs.writeFileSync(
      path.join(projectRoot, '.planning', 'config.json'),
      JSON.stringify({ sub_repos: ['backend'] })
    );

    // Add a new repo
    fs.mkdirSync(path.join(projectRoot, 'frontend', '.git'), { recursive: true });

    const config = loadConfig(projectRoot);
    assert.deepStrictEqual(config.sub_repos, ['backend', 'frontend']);
  });

  test('removes repos that no longer have .git', () => {
    fs.mkdirSync(path.join(projectRoot, 'backend', '.git'), { recursive: true });
    fs.writeFileSync(
      path.join(projectRoot, '.planning', 'config.json'),
      JSON.stringify({ sub_repos: ['backend', 'old-repo'] })
    );

    const config = loadConfig(projectRoot);
    assert.deepStrictEqual(config.sub_repos, ['backend']);
  });

  test('does not sync when sub_repos is empty and no repos detected', () => {
    fs.writeFileSync(
      path.join(projectRoot, '.planning', 'config.json'),
      JSON.stringify({ sub_repos: [] })
    );

    const config = loadConfig(projectRoot);
    assert.deepStrictEqual(config.sub_repos, []);
  });
});

// ─── findProjectRoot ─────────────────────────────────────────────────────────

describe('findProjectRoot', () => {
  let projectRoot;

  beforeEach(() => {
    projectRoot = fs.mkdtempSync(path.join(os.tmpdir(), 'gsd-root-test-'));
  });

  afterEach(() => {
    fs.rmSync(projectRoot, { recursive: true, force: true });
  });

  test('returns startDir when no .planning/ exists anywhere', () => {
    const subDir = path.join(projectRoot, 'backend');
    fs.mkdirSync(subDir);
    assert.strictEqual(findProjectRoot(subDir), subDir);
  });

  test('returns startDir when .planning/ is in startDir itself', () => {
    fs.mkdirSync(path.join(projectRoot, '.planning'), { recursive: true });
    assert.strictEqual(findProjectRoot(projectRoot), projectRoot);
  });

  test('walks up to parent with .planning/ and sub_repos config listing this dir', () => {
    fs.mkdirSync(path.join(projectRoot, '.planning'), { recursive: true });
    fs.writeFileSync(
      path.join(projectRoot, '.planning', 'config.json'),
      JSON.stringify({ sub_repos: ['backend', 'frontend'] })
    );

    const backendDir = path.join(projectRoot, 'backend');
    fs.mkdirSync(backendDir);

    assert.strictEqual(findProjectRoot(backendDir), projectRoot);
  });

  test('walks up from nested sub-repo subdirectory', () => {
    fs.mkdirSync(path.join(projectRoot, '.planning'), { recursive: true });
    fs.writeFileSync(
      path.join(projectRoot, '.planning', 'config.json'),
      JSON.stringify({ sub_repos: ['backend', 'frontend'] })
    );

    const deepDir = path.join(projectRoot, 'backend', 'src', 'services');
    fs.mkdirSync(deepDir, { recursive: true });

    assert.strictEqual(findProjectRoot(deepDir), projectRoot);
  });

  test('walks up via legacy multiRepo flag', () => {
    fs.mkdirSync(path.join(projectRoot, '.planning'), { recursive: true });
    fs.writeFileSync(
      path.join(projectRoot, '.planning', 'config.json'),
      JSON.stringify({ multiRepo: true })
    );

    const backendDir = path.join(projectRoot, 'backend');
    fs.mkdirSync(path.join(backendDir, '.git'), { recursive: true });

    assert.strictEqual(findProjectRoot(backendDir), projectRoot);
  });

  test('walks up via .git heuristic when no config exists', () => {
    fs.mkdirSync(path.join(projectRoot, '.planning'), { recursive: true });
    // No config.json at all

    const backendDir = path.join(projectRoot, 'backend');
    fs.mkdirSync(path.join(backendDir, '.git'), { recursive: true });

    assert.strictEqual(findProjectRoot(backendDir), projectRoot);
  });

  test('walks up from nested path inside sub-repo via .git heuristic', () => {
    fs.mkdirSync(path.join(projectRoot, '.planning'), { recursive: true });

    // Sub-repo with .git at its root
    const backendDir = path.join(projectRoot, 'backend');
    fs.mkdirSync(path.join(backendDir, '.git'), { recursive: true });

    // Nested path deep inside the sub-repo
    const nestedDir = path.join(backendDir, 'src', 'modules', 'auth');
    fs.mkdirSync(nestedDir, { recursive: true });

    // isInsideGitRepo walks up and finds backend/.git
    assert.strictEqual(findProjectRoot(nestedDir), projectRoot);
  });

  test('walks up from nested path inside sub-repo via sub_repos config', () => {
    fs.mkdirSync(path.join(projectRoot, '.planning'), { recursive: true });
    fs.writeFileSync(
      path.join(projectRoot, '.planning', 'config.json'),
      JSON.stringify({ sub_repos: ['backend'] })
    );

    // Nested path deep inside the sub-repo
    const nestedDir = path.join(projectRoot, 'backend', 'src', 'modules');
    fs.mkdirSync(nestedDir, { recursive: true });

    // With sub_repos config, it checks topSegment of relative path
    assert.strictEqual(findProjectRoot(nestedDir), projectRoot);
  });

  test('walks up from nested path via legacy multiRepo flag', () => {
    fs.mkdirSync(path.join(projectRoot, '.planning'), { recursive: true });
    fs.writeFileSync(
      path.join(projectRoot, '.planning', 'config.json'),
      JSON.stringify({ multiRepo: true })
    );

    const backendDir = path.join(projectRoot, 'backend');
    fs.mkdirSync(path.join(backendDir, '.git'), { recursive: true });

    // Nested inside sub-repo — isInsideGitRepo walks up and finds backend/.git
    const nestedDir = path.join(backendDir, 'src');
    fs.mkdirSync(nestedDir, { recursive: true });

    assert.strictEqual(findProjectRoot(nestedDir), projectRoot);
  });

  test('does not walk up for dirs without .git when no sub_repos config', () => {
    fs.mkdirSync(path.join(projectRoot, '.planning'), { recursive: true });

    const scriptsDir = path.join(projectRoot, 'scripts');
    fs.mkdirSync(scriptsDir);

    assert.strictEqual(findProjectRoot(scriptsDir), scriptsDir);
  });

  test('handles planning.sub_repos nested config format', () => {
    fs.mkdirSync(path.join(projectRoot, '.planning'), { recursive: true });
    fs.writeFileSync(
      path.join(projectRoot, '.planning', 'config.json'),
      JSON.stringify({ planning: { sub_repos: ['backend'] } })
    );

    const backendDir = path.join(projectRoot, 'backend');
    fs.mkdirSync(backendDir);

    assert.strictEqual(findProjectRoot(backendDir), projectRoot);
  });

  test('returns startDir when sub_repos is empty and no .git', () => {
    fs.mkdirSync(path.join(projectRoot, '.planning'), { recursive: true });
    fs.writeFileSync(
      path.join(projectRoot, '.planning', 'config.json'),
      JSON.stringify({ sub_repos: [] })
    );

    const backendDir = path.join(projectRoot, 'backend');
    fs.mkdirSync(backendDir);

    assert.strictEqual(findProjectRoot(backendDir), backendDir);
  });

  test('walks up from subdirectory when .git is at same level as .planning/ (single-repo)', () => {
    // Common single-repo layout: .git and .planning are siblings at project root
    fs.mkdirSync(path.join(projectRoot, '.planning'), { recursive: true });
    fs.mkdirSync(path.join(projectRoot, '.git'), { recursive: true });

    // User cwd is a subdirectory (e.g., src/)
    const srcDir = path.join(projectRoot, 'src');
    fs.mkdirSync(srcDir, { recursive: true });

    // Should detect that parent has .planning/ and .git is at that same level
    assert.strictEqual(findProjectRoot(srcDir), projectRoot);
  });

  test('walks up from deep subdirectory when .git is at same level as .planning/', () => {
    // Single-repo: .git and .planning at root, cwd deep inside
    fs.mkdirSync(path.join(projectRoot, '.planning'), { recursive: true });
    fs.mkdirSync(path.join(projectRoot, '.git'), { recursive: true });

    const deepDir = path.join(projectRoot, 'src', 'lib', 'utils');
    fs.mkdirSync(deepDir, { recursive: true });

    assert.strictEqual(findProjectRoot(deepDir), projectRoot);
  });

  test('returns startDir when .planning exists at same level (cwd is project root)', () => {
    // User is already at project root — no parent to walk up to
    fs.mkdirSync(path.join(projectRoot, '.planning'), { recursive: true });
    fs.mkdirSync(path.join(projectRoot, '.git'), { recursive: true });

    assert.strictEqual(findProjectRoot(projectRoot), projectRoot);
  });

  test('does not walk past child with own .planning/ to workspace parent (#1362)', () => {
    // Workspace layout: parent has .planning/, child git repo also has .planning/
    // findProjectRoot should return the child (startDir), not the parent
    fs.mkdirSync(path.join(projectRoot, '.planning'), { recursive: true });

    const childRepo = path.join(projectRoot, 'authenticator');
    fs.mkdirSync(path.join(childRepo, '.planning'), { recursive: true });
    fs.mkdirSync(path.join(childRepo, '.git'), { recursive: true });

    assert.strictEqual(findProjectRoot(childRepo), childRepo);
  });

  test('does not walk past nested dir whose git root has .planning/ (#1362)', () => {
    // Workspace layout: parent has .planning/, child git repo also has .planning/
    // cwd is deep inside child — should resolve to child root, not workspace root
    fs.mkdirSync(path.join(projectRoot, '.planning'), { recursive: true });

    const childRepo = path.join(projectRoot, 'authenticator');
    fs.mkdirSync(path.join(childRepo, '.planning'), { recursive: true });
    fs.mkdirSync(path.join(childRepo, '.git'), { recursive: true });

    const deepDir = path.join(childRepo, 'src', 'lib');
    fs.mkdirSync(deepDir, { recursive: true });

    assert.strictEqual(findProjectRoot(deepDir), childRepo);
  });
});

// ─── reapStaleTempFiles ─────────────────────────────────────────────────────

describe('reapStaleTempFiles', () => {
  const gsdTmpDir = path.join(os.tmpdir(), 'gsd');

  test('removes stale gsd-*.json files older than maxAgeMs', () => {
    fs.mkdirSync(gsdTmpDir, { recursive: true });
    const stalePath = path.join(gsdTmpDir, `gsd-reap-test-${Date.now()}.json`);
    fs.writeFileSync(stalePath, '{}');
    // Set mtime to 10 minutes ago
    const oldTime = new Date(Date.now() - 10 * 60 * 1000);
    fs.utimesSync(stalePath, oldTime, oldTime);

    reapStaleTempFiles('gsd-reap-test-', { maxAgeMs: 5 * 60 * 1000 });

    assert.ok(!fs.existsSync(stalePath), 'stale file should be removed');
  });

  test('preserves fresh gsd-*.json files', () => {
    fs.mkdirSync(gsdTmpDir, { recursive: true });
    const freshPath = path.join(gsdTmpDir, `gsd-reap-fresh-${Date.now()}.json`);
    fs.writeFileSync(freshPath, '{}');

    reapStaleTempFiles('gsd-reap-fresh-', { maxAgeMs: 5 * 60 * 1000 });

    assert.ok(fs.existsSync(freshPath), 'fresh file should be preserved');
    // Clean up
    fs.unlinkSync(freshPath);
  });

  test('removes stale temp directories when present', () => {
    fs.mkdirSync(gsdTmpDir, { recursive: true });
    const staleDir = fs.mkdtempSync(path.join(gsdTmpDir, 'gsd-reap-dir-'));
    fs.writeFileSync(path.join(staleDir, 'data.jsonl'), 'test');
    // Set mtime to 10 minutes ago
    const oldTime = new Date(Date.now() - 10 * 60 * 1000);
    fs.utimesSync(staleDir, oldTime, oldTime);

    reapStaleTempFiles('gsd-reap-dir-', { maxAgeMs: 5 * 60 * 1000 });

    assert.ok(!fs.existsSync(staleDir), 'stale directory should be removed');
  });

  test('does not throw on empty or missing prefix matches', () => {
    assert.doesNotThrow(() => {
      reapStaleTempFiles('gsd-nonexistent-prefix-xyz-', { maxAgeMs: 0 });
    });
  });
});

// ─── planningDir ──────────────────────────────────────────────────────────────

describe('planningDir', () => {
  const cwd = '/fake/repo';
  let savedProject, savedWorkstream;

  beforeEach(() => {
    savedProject = process.env.GSD_PROJECT;
    savedWorkstream = process.env.GSD_WORKSTREAM;
    delete process.env.GSD_PROJECT;
    delete process.env.GSD_WORKSTREAM;
  });

  afterEach(() => {
    if (savedProject !== undefined) process.env.GSD_PROJECT = savedProject;
    else delete process.env.GSD_PROJECT;
    if (savedWorkstream !== undefined) process.env.GSD_WORKSTREAM = savedWorkstream;
    else delete process.env.GSD_WORKSTREAM;
  });

  test('returns .planning/ when neither project nor workstream is set', () => {
    const result = planningDir(cwd, null, null);
    assert.strictEqual(result, path.join(cwd, '.planning'));
  });

  test('returns .planning/{project}/ when project is set', () => {
    const result = planningDir(cwd, null, 'my-app');
    assert.strictEqual(result, path.join(cwd, '.planning', 'my-app'));
  });

  test('returns .planning/workstreams/{ws}/ when workstream is set', () => {
    const result = planningDir(cwd, 'feature-x', null);
    assert.strictEqual(result, path.join(cwd, '.planning', 'workstreams', 'feature-x'));
  });

  test('returns .planning/{project}/workstreams/{ws}/ when both are set', () => {
    const result = planningDir(cwd, 'feature-x', 'my-app');
    assert.strictEqual(result, path.join(cwd, '.planning', 'my-app', 'workstreams', 'feature-x'));
  });

  test('reads GSD_PROJECT from env when project param is undefined', () => {
    process.env.GSD_PROJECT = 'env-project';
    const result = planningDir(cwd);
    assert.strictEqual(result, path.join(cwd, '.planning', 'env-project'));
  });

  test('rejects path traversal in project name', () => {
    assert.throws(
      () => planningDir(cwd, null, '../../etc'),
      /invalid path characters/
    );
  });

  test('rejects forward slash in project name', () => {
    assert.throws(
      () => planningDir(cwd, null, 'foo/bar'),
      /invalid path characters/
    );
  });

  test('rejects backslash in project name', () => {
    assert.throws(
      () => planningDir(cwd, null, 'foo\\bar'),
      /invalid path characters/
    );
  });

  test('rejects path traversal in workstream name', () => {
    assert.throws(
      () => planningDir(cwd, '../../../tmp', null),
      /invalid path characters/
    );
  });
});

// ─── timeAgo ──────────────────────────────────────────────────────────────────

describe('timeAgo', () => {
  const now = () => Date.now();
  const dateAt = (msAgo) => new Date(now() - msAgo);

  // ─── seconds boundary ───
  test('returns "just now" for dates under 5 seconds old', () => {
    assert.strictEqual(timeAgo(dateAt(0)), 'just now');
    assert.strictEqual(timeAgo(dateAt(4_000)), 'just now');
  });

  test('returns "N seconds ago" between 5 and 59 seconds', () => {
    assert.strictEqual(timeAgo(dateAt(5_000)), '5 seconds ago');
    assert.strictEqual(timeAgo(dateAt(30_000)), '30 seconds ago');
    assert.strictEqual(timeAgo(dateAt(59_000)), '59 seconds ago');
  });

  // ─── minutes boundary ───
  test('transitions to minutes at 60 seconds', () => {
    assert.strictEqual(timeAgo(dateAt(60_000)), '1 minute ago');
  });

  test('uses singular "1 minute ago" for exactly one minute', () => {
    assert.strictEqual(timeAgo(dateAt(60_000)), '1 minute ago');
    assert.strictEqual(timeAgo(dateAt(119_000)), '1 minute ago');
  });

  test('uses plural "N minutes ago" for 2-59 minutes', () => {
    assert.strictEqual(timeAgo(dateAt(120_000)), '2 minutes ago');
    assert.strictEqual(timeAgo(dateAt(5 * 60_000)), '5 minutes ago');
    assert.strictEqual(timeAgo(dateAt(59 * 60_000)), '59 minutes ago');
  });

  // ─── hours boundary ───
  test('transitions to hours at 60 minutes', () => {
    assert.strictEqual(timeAgo(dateAt(60 * 60_000)), '1 hour ago');
  });

  test('uses singular "1 hour ago" for exactly one hour', () => {
    assert.strictEqual(timeAgo(dateAt(60 * 60_000)), '1 hour ago');
    assert.strictEqual(timeAgo(dateAt(119 * 60_000)), '1 hour ago');
  });

  test('uses plural "N hours ago" for 2-23 hours', () => {
    assert.strictEqual(timeAgo(dateAt(2 * 3600_000)), '2 hours ago');
    assert.strictEqual(timeAgo(dateAt(23 * 3600_000)), '23 hours ago');
  });

  // ─── days boundary ───
  test('transitions to days at 24 hours', () => {
    assert.strictEqual(timeAgo(dateAt(24 * 3600_000)), '1 day ago');
  });

  test('uses singular "1 day ago" for exactly one day', () => {
    assert.strictEqual(timeAgo(dateAt(24 * 3600_000)), '1 day ago');
  });

  test('uses plural "N days ago" for 2-29 days', () => {
    assert.strictEqual(timeAgo(dateAt(2 * 86400_000)), '2 days ago');
    assert.strictEqual(timeAgo(dateAt(29 * 86400_000)), '29 days ago');
  });

  // ─── months boundary ───
  test('transitions to months at 30 days', () => {
    assert.strictEqual(timeAgo(dateAt(30 * 86400_000)), '1 month ago');
  });

  test('uses singular "1 month ago" for exactly one month (30 days)', () => {
    assert.strictEqual(timeAgo(dateAt(30 * 86400_000)), '1 month ago');
    assert.strictEqual(timeAgo(dateAt(59 * 86400_000)), '1 month ago');
  });

  test('uses plural "N months ago" for 2-11 months', () => {
    assert.strictEqual(timeAgo(dateAt(60 * 86400_000)), '2 months ago');
    assert.strictEqual(timeAgo(dateAt(180 * 86400_000)), '6 months ago');
  });

  // ─── years boundary ───
  test('transitions to years at 365 days', () => {
    assert.strictEqual(timeAgo(dateAt(365 * 86400_000)), '1 year ago');
  });

  test('uses singular "1 year ago" for exactly one year', () => {
    assert.strictEqual(timeAgo(dateAt(365 * 86400_000)), '1 year ago');
  });

  test('uses plural "N years ago" for 2+ years', () => {
    assert.strictEqual(timeAgo(dateAt(2 * 365 * 86400_000)), '2 years ago');
    assert.strictEqual(timeAgo(dateAt(10 * 365 * 86400_000)), '10 years ago');
  });

  // ─── edge cases ───
  test('handles future dates as "just now" (negative elapsed)', () => {
    // A date 5 seconds in the future has negative elapsed time, which floors to a negative
    // number of seconds and hits the "under 5 seconds" branch.
    assert.strictEqual(timeAgo(new Date(Date.now() + 5_000)), 'just now');
  });
});