/**
 * Learnings Store Tests
 *
 * Tests for the global learnings CRUD library: write, read, list, query,
 * delete, dedup, empty store, malformed file handling, copyFromProject, prune.
 */

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 {
  learningsWrite,
  learningsRead,
  learningsList,
  learningsQuery,
  learningsDelete,
  learningsCopyFromProject,
  learningsPrune,
} = require('../msd-core/bin/lib/learnings.cjs');
const { runMsdTools, createTempProject, cleanup } = require('./helpers.cjs');

// ─── Test Helpers ────────────────────────────────────────────────────────────

/**
 * Create a unique temp directory for each test.
 * @returns {string}
 */
function makeTempDir() {
  return fs.mkdtempSync(path.join(os.tmpdir(), 'msd-learnings-test-'));
}

/**
 * Remove a directory recursively.
 * @param {string} dir
 */
function cleanupDir(dir) {
  cleanup(dir);
}

// ─── Write ───────────────────────────────────────────────────────────────────

describe('learningsWrite', () => {
  let storeDir;
  beforeEach(() => { storeDir = makeTempDir(); });
  afterEach(() => { cleanupDir(storeDir); });

  test('creates a learning file with all required fields', () => {
    const result = learningsWrite({
      source_project: 'test-project',
      learning: 'Always validate inputs before processing',
      context: 'security review',
      tags: ['security', 'validation'],
    }, { storeDir });

    assert.ok(result.id, 'should return an id');
    assert.strictEqual(result.created, true);
    assert.ok(result.content_hash, 'should return a content_hash');

    // Verify file exists and has correct structure
    const filePath = path.join(storeDir, `${result.id}.json`);
    assert.ok(fs.existsSync(filePath), 'file should exist on disk');

    const record = JSON.parse(fs.readFileSync(filePath, 'utf-8'));
    assert.strictEqual(record.id, result.id);
    assert.strictEqual(record.source_project, 'test-project');
    assert.strictEqual(record.learning, 'Always validate inputs before processing');
    assert.strictEqual(record.context, 'security review');
    assert.deepStrictEqual(record.tags, ['security', 'validation']);
    assert.strictEqual(record.content_hash, result.content_hash);
    assert.ok(record.date, 'should have a date');
  });

  test('creates store directory on first write', () => {
    const nestedDir = path.join(storeDir, 'nested', 'store');
    assert.ok(!fs.existsSync(nestedDir), 'dir should not exist yet');

    learningsWrite({
      source_project: 'test',
      learning: 'test learning',
    }, { storeDir: nestedDir });

    assert.ok(fs.existsSync(nestedDir), 'dir should be created on write');
  });

  test('defaults context to empty string and tags to empty array', () => {
    const result = learningsWrite({
      source_project: 'test',
      learning: 'minimal entry',
    }, { storeDir });

    const record = learningsRead(result.id, { storeDir });
    assert.strictEqual(record.context, '');
    assert.deepStrictEqual(record.tags, []);
  });
});

// ─── Deduplication ───────────────────────────────────────────────────────────

describe('deduplication', () => {
  let storeDir;
  beforeEach(() => { storeDir = makeTempDir(); });
  afterEach(() => { cleanupDir(storeDir); });

  test('same content from same project is not stored twice', () => {
    const entry = {
      source_project: 'my-project',
      learning: 'Use content hashing for dedup',
      tags: ['dedup'],
    };

    const first = learningsWrite(entry, { storeDir });
    const second = learningsWrite(entry, { storeDir });

    assert.strictEqual(first.created, true);
    assert.strictEqual(second.created, false);
    assert.strictEqual(first.content_hash, second.content_hash);
    assert.strictEqual(first.id, second.id);

    // Only one file on disk
    const files = fs.readdirSync(storeDir).filter(f => f.endsWith('.json'));
    assert.strictEqual(files.length, 1);
  });

  test('same learning from different projects creates separate entries', () => {
    const learning = 'Same learning text';

    const first = learningsWrite({
      source_project: 'project-a',
      learning,
    }, { storeDir });

    const second = learningsWrite({
      source_project: 'project-b',
      learning,
    }, { storeDir });

    assert.strictEqual(first.created, true);
    assert.strictEqual(second.created, true);
    assert.notStrictEqual(first.content_hash, second.content_hash);

    const files = fs.readdirSync(storeDir).filter(f => f.endsWith('.json'));
    assert.strictEqual(files.length, 2);
  });
});

// ─── Read ────────────────────────────────────────────────────────────────────

describe('learningsRead', () => {
  let storeDir;
  beforeEach(() => { storeDir = makeTempDir(); });
  afterEach(() => { cleanupDir(storeDir); });

  test('returns a learning by ID', () => {
    const { id } = learningsWrite({
      source_project: 'test',
      learning: 'readable entry',
      tags: ['read'],
    }, { storeDir });

    const record = learningsRead(id, { storeDir });
    assert.ok(record);
    assert.strictEqual(record.id, id);
    assert.strictEqual(record.learning, 'readable entry');
  });

  test('returns null for non-existent ID', () => {
    const record = learningsRead('does-not-exist', { storeDir });
    assert.strictEqual(record, null);
  });
});

// ─── List ────────────────────────────────────────────────────────────────────

describe('learningsList', () => {
  let storeDir;
  beforeEach(() => { storeDir = makeTempDir(); });
  afterEach(() => { cleanupDir(storeDir); });

  test('returns empty array for empty store', () => {
    const results = learningsList({ storeDir });
    assert.deepStrictEqual(results, []);
  });

  test('returns empty array when store dir does not exist', () => {
    const results = learningsList({ storeDir: path.join(storeDir, 'nonexistent') });
    assert.deepStrictEqual(results, []);
  });

  test('returns all learnings sorted by date (newest first)', () => {
    // Write three entries with controlled dates
    const id1 = learningsWrite({
      source_project: 'p1',
      learning: 'first',
    }, { storeDir }).id;

    // Manually adjust dates to control sort order
    const file1 = path.join(storeDir, `${id1}.json`);
    const rec1 = JSON.parse(fs.readFileSync(file1, 'utf-8'));
    rec1.date = '2025-01-01T00:00:00.000Z';
    fs.writeFileSync(file1, JSON.stringify(rec1));

    const id2 = learningsWrite({
      source_project: 'p2',
      learning: 'second',
    }, { storeDir }).id;

    const file2 = path.join(storeDir, `${id2}.json`);
    const rec2 = JSON.parse(fs.readFileSync(file2, 'utf-8'));
    rec2.date = '2025-06-15T00:00:00.000Z';
    fs.writeFileSync(file2, JSON.stringify(rec2));

    const id3 = learningsWrite({
      source_project: 'p3',
      learning: 'third',
    }, { storeDir }).id;

    const file3 = path.join(storeDir, `${id3}.json`);
    const rec3 = JSON.parse(fs.readFileSync(file3, 'utf-8'));
    rec3.date = '2025-03-10T00:00:00.000Z';
    fs.writeFileSync(file3, JSON.stringify(rec3));

    const results = learningsList({ storeDir });
    assert.strictEqual(results.length, 3);
    assert.strictEqual(results[0].learning, 'second');  // newest
    assert.strictEqual(results[1].learning, 'third');    // middle
    assert.strictEqual(results[2].learning, 'first');    // oldest
  });
});

// ─── Query ───────────────────────────────────────────────────────────────────

describe('learningsQuery', () => {
  let storeDir;
  beforeEach(() => { storeDir = makeTempDir(); });
  afterEach(() => { cleanupDir(storeDir); });

  test('filters by tag', () => {
    learningsWrite({
      source_project: 'p1',
      learning: 'auth lesson',
      tags: ['auth', 'security'],
    }, { storeDir });

    learningsWrite({
      source_project: 'p2',
      learning: 'ui lesson',
      tags: ['ui', 'css'],
    }, { storeDir });

    learningsWrite({
      source_project: 'p3',
      learning: 'auth pattern',
      tags: ['auth', 'patterns'],
    }, { storeDir });

    const results = learningsQuery({ tag: 'auth' }, { storeDir });
    assert.strictEqual(results.length, 2);
    assert.ok(results.every(r => r.tags.includes('auth')));
  });

  test('returns all when no tag filter', () => {
    learningsWrite({ source_project: 'p1', learning: 'a' }, { storeDir });
    learningsWrite({ source_project: 'p2', learning: 'b' }, { storeDir });

    const results = learningsQuery({}, { storeDir });
    assert.strictEqual(results.length, 2);
  });

  test('returns empty array when tag not found', () => {
    learningsWrite({
      source_project: 'p1',
      learning: 'something',
      tags: ['other'],
    }, { storeDir });

    const results = learningsQuery({ tag: 'nonexistent' }, { storeDir });
    assert.strictEqual(results.length, 0);
  });
});

// ─── Delete ──────────────────────────────────────────────────────────────────

describe('learningsDelete', () => {
  let storeDir;
  beforeEach(() => { storeDir = makeTempDir(); });
  afterEach(() => { cleanupDir(storeDir); });

  test('removes a learning by ID', () => {
    const { id } = learningsWrite({
      source_project: 'test',
      learning: 'to be deleted',
    }, { storeDir });

    assert.strictEqual(learningsDelete(id, { storeDir }), true);
    assert.strictEqual(learningsRead(id, { storeDir }), null);

    const files = fs.readdirSync(storeDir).filter(f => f.endsWith('.json'));
    assert.strictEqual(files.length, 0);
  });

  test('returns false for non-existent ID', () => {
    assert.strictEqual(learningsDelete('nonexistent', { storeDir }), false);
  });
});

// ─── Malformed File Handling ─────────────────────────────────────────────────

describe('malformed file handling', () => {
  let storeDir;
  beforeEach(() => { storeDir = makeTempDir(); });
  afterEach(() => { cleanupDir(storeDir); });

  test('list skips malformed JSON files with warning', () => {
    // Write a valid entry
    learningsWrite({
      source_project: 'test',
      learning: 'valid entry',
    }, { storeDir });

    // Write a malformed JSON file
    fs.writeFileSync(path.join(storeDir, 'bad-entry.json'), '{not valid json!!!', 'utf-8');

    const results = learningsList({ storeDir });
    assert.strictEqual(results.length, 1);
    assert.strictEqual(results[0].learning, 'valid entry');
  });

  test('write dedup check skips malformed files without crashing', () => {
    // Write a malformed JSON file first
    fs.writeFileSync(path.join(storeDir, 'corrupt.json'), 'corrupted!', 'utf-8');

    // Writing should still succeed
    const result = learningsWrite({
      source_project: 'test',
      learning: 'new entry after corrupt',
    }, { storeDir });

    assert.strictEqual(result.created, true);
  });
});

// ─── Copy From Project ───────────────────────────────────────────────────────

describe('learningsCopyFromProject', () => {
  let storeDir;
  let projectDir;

  beforeEach(() => {
    storeDir = makeTempDir();
    projectDir = makeTempDir();
  });
  afterEach(() => {
    cleanupDir(storeDir);
    cleanupDir(projectDir);
  });

  test('copies learnings from LEARNINGS.md into global store', () => {
    const learningsMd = `# Project Learnings

## Authentication Patterns
Always use OAuth2 for third-party auth.
Never store tokens in localStorage.

## Database Design
Normalize to 3NF unless read performance demands denormalization.

## Error Handling
Use custom error classes that extend Error.
`;
    fs.writeFileSync(path.join(projectDir, 'LEARNINGS.md'), learningsMd, 'utf-8');

    const result = learningsCopyFromProject(projectDir, {
      storeDir,
      sourceProject: 'my-app',
    });

    assert.strictEqual(result.created, 3);
    assert.strictEqual(result.skipped, 0);

    const all = learningsList({ storeDir });
    assert.strictEqual(all.length, 3);

    // Verify content was captured
    const learningTexts = all.map(r => r.learning);
    assert.ok(learningTexts.some(t => t.includes('OAuth2')));
    assert.ok(learningTexts.some(t => t.includes('Normalize to 3NF')));
    assert.ok(learningTexts.some(t => t.includes('custom error classes')));
  });

  test('deduplicates on second copy', () => {
    const learningsMd = `# Learnings

## Testing
Always write tests first.
`;
    fs.writeFileSync(path.join(projectDir, 'LEARNINGS.md'), learningsMd, 'utf-8');

    learningsCopyFromProject(projectDir, { storeDir, sourceProject: 'app' });
    const second = learningsCopyFromProject(projectDir, { storeDir, sourceProject: 'app' });

    assert.strictEqual(second.created, 0);
    assert.strictEqual(second.skipped, 1);

    const all = learningsList({ storeDir });
    assert.strictEqual(all.length, 1);
  });

  test('returns zero counts when LEARNINGS.md does not exist', () => {
    const result = learningsCopyFromProject(projectDir, { storeDir });
    assert.deepStrictEqual(result, { total: 0, created: 0, skipped: 0 });
  });

  test('skips sections with empty body', () => {
    const learningsMd = `# Learnings

## Empty Section

## Has Content
Real content here.
`;
    fs.writeFileSync(path.join(projectDir, 'LEARNINGS.md'), learningsMd, 'utf-8');

    const result = learningsCopyFromProject(projectDir, { storeDir, sourceProject: 'app' });
    assert.strictEqual(result.created, 1);

    const all = learningsList({ storeDir });
    assert.strictEqual(all.length, 1);
    assert.ok(all[0].learning.includes('Real content'));
  });
});

// ─── Prune ───────────────────────────────────────────────────────────────────

describe('learningsPrune', () => {
  let storeDir;
  beforeEach(() => { storeDir = makeTempDir(); });
  afterEach(() => { cleanupDir(storeDir); });

  test('removes entries older than threshold', () => {
    // Create an old entry
    const oldId = learningsWrite({
      source_project: 'old-project',
      learning: 'ancient wisdom',
    }, { storeDir }).id;

    // Backdate it to 100 days ago
    const oldFile = path.join(storeDir, `${oldId}.json`);
    const oldRec = JSON.parse(fs.readFileSync(oldFile, 'utf-8'));
    oldRec.date = new Date(Date.now() - 100 * 24 * 60 * 60 * 1000).toISOString();
    fs.writeFileSync(oldFile, JSON.stringify(oldRec));

    // Create a recent entry
    learningsWrite({
      source_project: 'new-project',
      learning: 'fresh knowledge',
    }, { storeDir });

    const result = learningsPrune('90d', { storeDir });
    assert.strictEqual(result.removed, 1);
    assert.strictEqual(result.kept, 1);

    const remaining = learningsList({ storeDir });
    assert.strictEqual(remaining.length, 1);
    assert.strictEqual(remaining[0].learning, 'fresh knowledge');
  });

  test('keeps all entries when none are old enough', () => {
    learningsWrite({ source_project: 'p', learning: 'recent' }, { storeDir });

    const result = learningsPrune('30d', { storeDir });
    assert.strictEqual(result.removed, 0);
    assert.strictEqual(result.kept, 1);
  });

  test('returns zeros when store does not exist', () => {
    const result = learningsPrune('90d', { storeDir: path.join(storeDir, 'nope') });
    assert.deepStrictEqual(result, { removed: 0, kept: 0 });
  });

  test('throws on invalid duration format', () => {
    assert.throws(
      () => learningsPrune('invalid', { storeDir }),
      /Invalid duration format/
    );
  });
});

// ─── CLI Integration ────────────────────────────────────────────────────────

describe('CLI integration', () => {
  let tmpDir;
  beforeEach(() => { tmpDir = createTempProject(); });
  afterEach(() => { cleanup(tmpDir); });

  test('learnings list returns valid JSON', () => {
    const res = runMsdTools(['learnings', 'list'], tmpDir, { HOME: tmpDir });
    assert.strictEqual(res.success, true);
    const parsed = JSON.parse(res.output);
    assert.ok(Array.isArray(parsed.learnings));
    assert.strictEqual(typeof parsed.count, 'number');
  });

  test('learnings query --tag succeeds', () => {
    const res = runMsdTools(['learnings', 'query', '--tag', 'auth'], tmpDir, { HOME: tmpDir });
    assert.strictEqual(res.success, true);
    const parsed = JSON.parse(res.output);
    assert.ok(Array.isArray(parsed.learnings));
  });

  test('learnings prune with bad format exits non-zero', () => {
    const res = runMsdTools(['learnings', 'prune', '--older-than', 'badformat'], tmpDir, { HOME: tmpDir });
    assert.strictEqual(res.success, false);
    assert.ok(res.error.includes('Invalid duration format'));
  });

  test('learnings unknown subcommand exits non-zero', () => {
    const res = runMsdTools(['learnings', 'unknown'], tmpDir, { HOME: tmpDir });
    assert.strictEqual(res.success, false);
    assert.ok(res.error.includes('Unknown learnings subcommand'));
  });
});

// ─── Dedupe Scaling (#306) ───────────────────────────────────────────────────

/**
 * Build a LEARNINGS.md string with k unique ## sections.
 * Mirrors the ## heading format that learningsCopyFromProject parses.
 */
function makeLearningsMd(k) {
  const sections = [];
  for (let i = 1; i <= k; i++) {
    sections.push(`## Title ${i}\n\nBody content for item ${i}, unique text.`);
  }
  return `# Project Learnings\n\n${sections.join('\n\n')}\n`;
}

describe('learnings dedupe scaling (#306)', () => {
  test('store directory scan count is independent of imported item count', (t) => {
    // Test A: assert readdirSync call count does NOT scale with K (regression guard for #306)
    // BEFORE the fix: count scales 1:1 with K (one scan per learningsWrite call).
    // AFTER the fix: count is constant (one index-build scan per learningsCopyFromProject call).

    const storeDir2 = makeTempDir();
    const projectDir2 = makeTempDir();
    t.after(() => {
      cleanupDir(storeDir2);
      cleanupDir(projectDir2);
    });

    const storeDir6 = makeTempDir();
    const projectDir6 = makeTempDir();
    t.after(() => {
      cleanupDir(storeDir6);
      cleanupDir(projectDir6);
    });

    // K=2
    fs.writeFileSync(path.join(projectDir2, 'LEARNINGS.md'), makeLearningsMd(2), 'utf-8');
    const spy2 = t.mock.method(fs, 'readdirSync');
    const before2 = spy2.mock.calls.length;
    learningsCopyFromProject(projectDir2, { storeDir: storeDir2, sourceProject: 'proj-a' });
    const c1 = spy2.mock.calls.length - before2;
    spy2.mock.restore();

    // K=6
    fs.writeFileSync(path.join(projectDir6, 'LEARNINGS.md'), makeLearningsMd(6), 'utf-8');
    const spy6 = t.mock.method(fs, 'readdirSync');
    const before6 = spy6.mock.calls.length;
    learningsCopyFromProject(projectDir6, { storeDir: storeDir6, sourceProject: 'proj-b' });
    const c6 = spy6.mock.calls.length - before6;
    spy6.mock.restore();

    assert.strictEqual(c1, c6,
      `store directory scan count must be independent of imported item count (#306) — got ${c1} for K=2 vs ${c6} for K=6`);
  });

  test('dedupe semantics preserved: duplicate entry in existing store is skipped', (t) => {
    // Test B part 1: importing a section that duplicates an already-stored entry → skipped
    const storeDir = makeTempDir();
    const projectDir = makeTempDir();
    t.after(() => {
      cleanupDir(storeDir);
      cleanupDir(projectDir);
    });

    // Pre-seed one entry that matches the first section of our LEARNINGS.md
    learningsWrite({
      source_project: 'my-proj',
      learning: 'Body content for item 1, unique text.',
      context: 'Title 1',
      tags: ['title'],
    }, { storeDir });

    // LEARNINGS.md has 3 sections; section 1 duplicates the pre-seeded entry
    fs.writeFileSync(path.join(projectDir, 'LEARNINGS.md'), makeLearningsMd(3), 'utf-8');
    const result = learningsCopyFromProject(projectDir, { storeDir, sourceProject: 'my-proj' });

    assert.strictEqual(result.created, 2, 'two new sections should be created');
    assert.strictEqual(result.skipped, 1, 'one duplicate section should be skipped');

    const all = learningsList({ storeDir });
    assert.strictEqual(all.length, 3);
  });

  test('dedupe semantics preserved: two identical sections in same file → one created, one skipped', (t) => {
    // Test B part 2: exercises the index.set during-loop dedup path
    const storeDir = makeTempDir();
    const projectDir = makeTempDir();
    t.after(() => {
      cleanupDir(storeDir);
      cleanupDir(projectDir);
    });

    // Two identical ## sections in the same LEARNINGS.md
    const md = `# Learnings\n\n## Duplicate Section\n\nExact same body text.\n\n## Duplicate Section\n\nExact same body text.\n`;
    fs.writeFileSync(path.join(projectDir, 'LEARNINGS.md'), md, 'utf-8');

    const result = learningsCopyFromProject(projectDir, { storeDir, sourceProject: 'my-proj' });

    assert.strictEqual(result.created, 1, 'exactly one entry should be created');
    assert.strictEqual(result.skipped, 1, 'the duplicate should be skipped');

    const all = learningsList({ storeDir });
    assert.strictEqual(all.length, 1);
  });
});

// ─── #3683 — phase-scoped learnings source (path agreement + gated wiring) ──
//
// The extractor writes {PHASE_DIR}/{PADDED}-LEARNINGS.md; the copy command read
// only <root>/LEARNINGS.md (project root), so learnings.copy ALWAYS no-oped —
// the global-learnings store stayed empty even after manual extraction. The
// copy must discover the most recent phase-scoped artifact; the project-root
// path remains the fallback (legacy shape). Pins also cover the gated
// completion wiring in execute-phase.md and the registry/docs agreement.

describe('#3683 learnings copy source resolution', () => {
  let storeDir;
  let projectDir;

  beforeEach(() => {
    storeDir = makeTempDir();
    projectDir = makeTempDir();
  });
  afterEach(() => {
    cleanupDir(storeDir);
    cleanupDir(projectDir);
  });

  function writePhaseLearnings(phaseSlug, ageMinutes) {
    const phaseDir = path.join(projectDir, 'phases', phaseSlug);
    fs.mkdirSync(phaseDir, { recursive: true });
    const file = path.join(phaseDir, `${phaseSlug}-LEARNINGS.md`);
    fs.writeFileSync(file, `# Learnings\n\n## ${phaseSlug} Lesson\nBody for ${phaseSlug}.\n`, 'utf-8');
    const when = new Date(Date.now() - ageMinutes * 60 * 1000);
    fs.utimesSync(file, when, when);
    return file;
  }

  test('learnings copy reads the phase-scoped artifact', () => {
    writePhaseLearnings('1.0-discovery', 30);
    const result = learningsCopyFromProject(projectDir, { storeDir, sourceProject: 'app' });
    assert.strictEqual(result.created, 1, `phase-scoped artifact must be the copy source: ${JSON.stringify(result)}`);
    const all = learningsList({ storeDir });
    assert.ok(all.some((r) => r.learning.includes('Body for 1.0-discovery')), 'item body must land in learning');
  });

  test('learnings copy still reads the project-root artifact', () => {
    fs.writeFileSync(path.join(projectDir, 'LEARNINGS.md'), '# L\n\n## Root Lesson\nBody.\n', 'utf-8');
    const result = learningsCopyFromProject(projectDir, { storeDir, sourceProject: 'app' });
    assert.strictEqual(result.created, 1);
    assert.ok(learningsList({ storeDir }).some((r) => r.context === 'Root Lesson'), 'section title lands in context');
  });

  test('phase-scoped wins when both exist', () => {
    writePhaseLearnings('2.0-build', 10);
    fs.writeFileSync(path.join(projectDir, 'LEARNINGS.md'), '# L\n\n## Root Lesson\nBody.\n', 'utf-8');
    const result = learningsCopyFromProject(projectDir, { storeDir, sourceProject: 'app' });
    assert.strictEqual(result.created, 1);
    assert.ok(
      learningsList({ storeDir }).some((r) => r.learning.includes('Body for 2.0-build')),
      'the most recent phase artifact must win over the project-root file',
    );
  });

  test('learnings copy no-ops with no artifact', () => {
    const result = learningsCopyFromProject(projectDir, { storeDir, sourceProject: 'app' });
    assert.deepStrictEqual(result, { total: 0, created: 0, skipped: 0 });
  });

  test('learnings copy picks the most recent phase artifact', () => {
    writePhaseLearnings('1.0-discovery', 240); // older
    writePhaseLearnings('3.0-hardening', 5);   // newer
    const result = learningsCopyFromProject(projectDir, { storeDir, sourceProject: 'app' });
    assert.strictEqual(result.created, 1);
    assert.ok(learningsList({ storeDir }).some((r) => r.learning.includes('Body for 3.0-hardening')));
  });

  test('extractor-shaped artifact copies per-item entries, not category blobs', () => {
    // The real producer writes ## category sections containing ### items
    // (extract-learnings.md write_learnings). The copy must store each ###
    // item as its own learning — aggregating a category into one mega-entry
    // defeats the store's relevance contract (learnings.max_inject).
    const phaseDir = path.join(projectDir, 'phases', '4.0-real');
    fs.mkdirSync(phaseDir, { recursive: true });
    fs.writeFileSync(
      path.join(phaseDir, '4.0-real-LEARNINGS.md'),
      [
        '# Phase 4 Learnings',
        '',
        '## Decisions',
        '',
        '### Use SQLite over Postgres',
        'Zero-ops for single-node deployments.',
        '',
        '### Pin the runner image',
        'Reproducible CI beats newest-libraries.',
        '',
        '## Surprises',
        '',
        '### npm dedupe changed lockfile',
        'Expected; audit after upgrades.',
        '',
      ].join('\n'),
      'utf-8',
    );
    const result = learningsCopyFromProject(projectDir, { storeDir, sourceProject: 'app' });
    assert.strictEqual(result.created, 3, 'each ### item must become one learning');
    const all = learningsList({ storeDir });
    // ### item TITLES land in context; their BODIES land in learning.
    assert.ok(all.some((r) => r.context === 'Use SQLite over Postgres' && r.learning.includes('Zero-ops')));
    assert.ok(all.some((r) => r.context === 'Pin the runner image' && r.learning.includes('Reproducible')));
    assert.ok(all.some((r) => r.context === 'npm dedupe changed lockfile' && r.learning.includes('audit')));
    for (const r of all) {
      assert.ok(r.learning.length < 200, 'entries must be item-scoped, not category blobs');
    }
  });

  test('malformed artifact yields no entries', () => {
    const phaseDir = path.join(projectDir, 'phases', '1.0-x');
    fs.mkdirSync(phaseDir, { recursive: true });
    fs.writeFileSync(path.join(phaseDir, '1.0-x-LEARNINGS.md'), 'no sections at all\n', 'utf-8');
    const result = learningsCopyFromProject(projectDir, { storeDir, sourceProject: 'app' });
    assert.strictEqual(result.created, 0);
  });
});

describe('#3683 completion wiring and registry pins', () => {
  const EXECUTE_PHASE = path.join(__dirname, '..', 'msd-core', 'workflows', 'execute-phase.md');
  const REGISTRY = path.join(__dirname, '..', 'msd-core', 'templates', 'README.md');
  const FEATURES = path.join(__dirname, '..', 'docs', 'FEATURES.md');

  test('execute-phase completion wires gated extraction', () => {
    const content = fs.readFileSync(EXECUTE_PHASE, 'utf-8');
    const stepStart = content.indexOf('<step name="auto_copy_learnings">');
    assert.ok(stepStart !== -1, 'auto_copy_learnings step must exist');
    const stepEnd = content.indexOf('</step>', stepStart);
    const step = content.slice(stepStart, stepEnd);
    assert.ok(
      /extract-learnings|extract_learnings/.test(step),
      'the gated step must invoke the extraction producer for the completed phase',
    );
    assert.ok(
      /must NOT block phase completion|does not block phase completion|non-fatal/i.test(step),
      'extraction failure must be explicitly non-fatal',
    );
    // Gate-first ordering: the disabled skip must precede the extraction wiring
    // so disabled runs stay byte-identical.
    const gateIdx = step.indexOf('GL_ENABLED');
    const extractIdx = step.search(/Run the .extract[-_]learnings. workflow/);
    assert.ok(gateIdx !== -1 && extractIdx !== -1 && gateIdx < extractIdx, 'gate check must precede extraction');
  });

  test('registry producer attribution is gated', () => {
    const registry = fs.readFileSync(REGISTRY, 'utf-8');
    const splitLines = require('../msd-core/bin/lib/text-lines.cjs').splitLines;
    const row = splitLines(registry).find((l) => l.includes('LEARNINGS.md'));
    assert.ok(row, 'registry must carry a LEARNINGS.md row');
    assert.ok(
      /global_learnings|gated/i.test(row),
      `producer attribution must state the gate: ${row}`,
    );
  });

  test('features doc agrees with the registry', () => {
    const features = fs.readFileSync(FEATURES, 'utf-8');
    // Anchor on the SECTION HEADING — the TOC also mentions extract-learnings
    // ~2400 chars earlier and its window contains neither keyword.
    const heading = features.search(/##+\s*\d*\d*\.?\s*Extract Learnings/i);
    assert.ok(heading !== -1, 'FEATURES.md must have an Extract Learnings section');
    const section = features.slice(heading, heading + 4000);
    assert.ok(
      /global_learnings|automatically/i.test(section),
      'the learnings feature section must acknowledge the gated automatic path',
    );
  });
});