/**
 * Bug 9 regression — sync silently drops files with broken YAML.
 *
 * Before the fix, sync.ts caught per-file parse errors, printed a warning,
 * and still advanced sync.last_commit. The failed file was never retried
 * because it was behind the bookmark. Silent data loss.
 *
 * After the fix:
 *   - failures append to ~/.gbrain/sync-failures.jsonl (with dedup)
 *   - incremental + full-sync + import git-continuity paths gate the
 *     sync.last_commit advance on "no failures"
 *   - `gbrain sync --skip-failed` acknowledges the current set
 *   - `gbrain doctor` surfaces unacknowledged failures
 *
 * This suite exercises the helper + the dedup behavior. The full CLI
 * round-trip is covered by E2E tests.
 */

import { describe, test, expect, beforeEach, afterEach } from 'bun:test';
import { mkdtempSync, rmSync, readFileSync, existsSync, writeFileSync } from 'fs';
import { join } from 'path';
import { tmpdir } from 'os';

// Point HOME at a tmpdir so we don't stomp the real ~/.gbrain/sync-failures.jsonl
let tmpHome: string;
const originalHome = process.env.HOME;

beforeEach(async () => {
  tmpHome = mkdtempSync(join(tmpdir(), 'gbrain-sync-failures-'));
  process.env.HOME = tmpHome;
  // Belt-and-suspenders: explicitly clear the jsonl at the resolved path.
  const { syncFailuresPath } = await import('../src/core/sync.ts');
  try { rmSync(syncFailuresPath(), { force: true }); } catch { /* none */ }
});

afterEach(() => {
  if (originalHome) process.env.HOME = originalHome;
  else delete process.env.HOME;
  try { rmSync(tmpHome, { recursive: true, force: true }); } catch { /* ignore */ }
});

describe('Bug 9 — sync-failures JSONL helpers', () => {
  // issue #1939: recordSyncFailures now upserts by (source_id, path) and
  // increments `attempts` (consecutive failed runs) instead of appending a row
  // per (path, commit, error). One row per failing path; the attempt counter
  // drives the bounded auto-skip valve.
  test('recordSyncFailures upserts per path, incrementing attempts', async () => {
    const { recordSyncFailures, loadSyncFailures, syncFailuresPath } = await import('../src/core/sync.ts');

    recordSyncFailures([
      { path: 'people/alice.md', error: 'YAML: unexpected colon in title' },
      { path: 'notes/broken.md', error: 'YAML: duplicated key' },
    ], 'abc123def456');

    expect(existsSync(syncFailuresPath())).toBe(true);
    const entries = loadSyncFailures();
    expect(entries.length).toBe(2);
    const alice = entries.find(e => e.path === 'people/alice.md')!;
    expect(alice.commit).toBe('abc123def456');
    expect(alice.state).toBe('open');
    expect(alice.attempts).toBe(1);
    expect(alice.acknowledged).toBe(false);

    // Same path again (same commit) → still ONE row, attempts climbs.
    recordSyncFailures([
      { path: 'people/alice.md', error: 'YAML: unexpected colon in title' },
    ], 'abc123def456');
    expect(loadSyncFailures().length).toBe(2);
    expect(loadSyncFailures().find(e => e.path === 'people/alice.md')!.attempts).toBe(2);

    // Different commit → still upserted (not appended), attempts keeps climbing.
    recordSyncFailures([
      { path: 'people/alice.md', error: 'YAML: unexpected colon in title' },
    ], 'zzz999');
    const after = loadSyncFailures();
    expect(after.length).toBe(2);
    const alice2 = after.find(e => e.path === 'people/alice.md')!;
    expect(alice2.attempts).toBe(3);
    expect(alice2.commit).toBe('zzz999');
  });

  test('acknowledgeSyncFailures marks unacked entries, leaves acked alone', async () => {
    const { recordSyncFailures, acknowledgeSyncFailures, loadSyncFailures } = await import('../src/core/sync.ts');

    recordSyncFailures([
      { path: 'a.md', error: 'err1' },
      { path: 'b.md', error: 'err2' },
    ], 'commit1');

    const result = acknowledgeSyncFailures();
    expect(result.count).toBe(2);
    expect(result.summary.length).toBeGreaterThan(0);
    const after = loadSyncFailures();
    expect(after.every(e => e.acknowledged === true)).toBe(true);
    expect(after.every(e => typeof e.acknowledged_at === 'string')).toBe(true);

    // Second ack: nothing new to mark.
    expect(acknowledgeSyncFailures().count).toBe(0);

    // Adding a fresh failure then ack: only the new one flips.
    recordSyncFailures([{ path: 'c.md', error: 'err3' }], 'commit2');
    expect(acknowledgeSyncFailures().count).toBe(1);
    expect(loadSyncFailures().length).toBe(3);
    expect(loadSyncFailures().every(e => e.acknowledged === true)).toBe(true);
  });

  test('unacknowledgedSyncFailures filters correctly', async () => {
    const { recordSyncFailures, acknowledgeSyncFailures, unacknowledgedSyncFailures } = await import('../src/core/sync.ts');

    recordSyncFailures([{ path: 'a.md', error: 'err1' }], 'c1');
    acknowledgeSyncFailures();
    recordSyncFailures([{ path: 'b.md', error: 'err2' }], 'c2');

    const unacked = unacknowledgedSyncFailures();
    expect(unacked.length).toBe(1);
    expect(unacked[0].path).toBe('b.md');
  });

  test('loadSyncFailures returns [] when file is missing', async () => {
    const { loadSyncFailures } = await import('../src/core/sync.ts');
    expect(loadSyncFailures()).toEqual([]);
  });

  test('loadSyncFailures tolerates malformed lines', async () => {
    const { loadSyncFailures, syncFailuresPath, recordSyncFailures } = await import('../src/core/sync.ts');
    // Seed one valid entry.
    recordSyncFailures([{ path: 'a.md', error: 'err1' }], 'c1');
    // Append garbage.
    writeFileSync(syncFailuresPath(), readFileSync(syncFailuresPath(), 'utf-8') + 'NOT-JSON\n', { flag: 'w' });
    const out = loadSyncFailures();
    expect(out.length).toBe(1);
    expect(out[0].path).toBe('a.md');
  });
});

describe('Bug 9 — doctor surfaces sync failures', () => {
  test('doctor source contains sync_failures check', async () => {
    const source = await Bun.file(new URL('../src/commands/doctor.ts', import.meta.url)).text();
    expect(source).toContain('sync_failures');
    expect(source).toContain('unacknowledgedSyncFailures');
    expect(source).toContain("'gbrain sync --skip-failed'");
  });

  // issue #1939: BOTH doctor surfaces (local buildChecks + remote
  // doctorReportRemote) must decide severity through the one shared helper so
  // they can never drift. The remote surface must no longer hand-roll an
  // `acknowledged_at` count (the old field-split that caused drift).
  test('both doctor surfaces use the shared decideSyncFailureSeverity', async () => {
    const source = await Bun.file(new URL('../src/commands/doctor.ts', import.meta.url)).text();
    const occurrences = source.split('decideSyncFailureSeverity').length - 1;
    expect(occurrences).toBeGreaterThanOrEqual(2); // local + remote
    // remote no longer counts `!entry.acknowledged_at` by hand.
    expect(source).not.toContain('if (!entry.acknowledged_at) unacked++');
  });
});

describe('Bug 9 — sync.ts CLI flag wiring', () => {
  test('runSync parses --skip-failed and --retry-failed flags', async () => {
    const source = await Bun.file(new URL('../src/commands/sync.ts', import.meta.url)).text();
    expect(source).toContain("args.includes('--skip-failed')");
    expect(source).toContain("args.includes('--retry-failed')");
    expect(source).toContain('skipFailed');
    expect(source).toContain('retryFailed');
  });

  test('runSync acks pre-existing unacked failures up-front when --skip-failed is set', async () => {
    // Without this gate, a user who fixes their broken YAML, re-runs sync
    // (which finds nothing new and prints "Already up to date."), and then
    // runs `gbrain sync --skip-failed` to clear the log gets a no-op —
    // performSync's inner ack path only fires when failedFiles.length > 0
    // in the current run. This test pins the up-front ack at the top of
    // runSync so the flag means "ack whatever is currently flagged".
    // v0.42.42.0 (#2139, D13C): the pre-ack is now scoped PER SOURCE — `--all`
    // acks every source, single-source acks only its own.
    const source = await Bun.file(new URL('../src/commands/sync.ts', import.meta.url)).text();
    expect(source).toMatch(/if \(skipFailed\) \{[\s\S]*?syncAll \? acknowledgeFailures\(\) : acknowledgeFailures\(sourceId\)/);
  });

  test('acknowledgeSyncFailures clears stale failures end-to-end', async () => {
    // Behavioral pin: the helper that --skip-failed delegates to must
    // clear failures regardless of any current-run state. Mirrors the
    // recovery flow: file fixed → sync clean → user wants log cleared.
    const { recordSyncFailures, acknowledgeSyncFailures, unacknowledgedSyncFailures } = await import('../src/core/sync.ts');
    recordSyncFailures([
      { path: 'people/old-broken.md', error: 'YAML: bad block mapping' },
      { path: 'people/old-broken.md', error: 'YAML: bad block mapping' }, // dup, dedup'd by recordSyncFailures
      { path: 'meetings/stale.md',    error: 'YAML: multiline key' },
    ], 'old-commit');
    expect(unacknowledgedSyncFailures().length).toBe(2);
    const result = acknowledgeSyncFailures();
    expect(result.count).toBe(2);
    expect(unacknowledgedSyncFailures().length).toBe(0);
  });

  test('performSync gates the bookmark through the shared failure ledger', async () => {
    const source = await Bun.file(new URL('../src/commands/sync.ts', import.meta.url)).text();
    // issue #1939: the gate is now the shared applySyncFailureGate orchestrator.
    expect(source).toContain('applySyncFailureGate');
    expect(source).toContain('blocked_by_failures');
  });

  test('performFullSync routes failures through the same shared gate', async () => {
    const source = await Bun.file(new URL('../src/commands/sync.ts', import.meta.url)).text();
    expect(source).toContain('result.failures');
    expect(source).toContain('applySyncFailureGate');
  });

  test('runImport returns RunImportResult and records via the ledger', async () => {
    const source = await Bun.file(new URL('../src/commands/import.ts', import.meta.url)).text();
    expect(source).toContain('RunImportResult');
    expect(source).toContain('failures: Array<{ path: string; error: string }>');
    // issue #1939: import records source-scoped via recordFailures (sourceId, …).
    expect(source).toContain('recordFailures');
  });
});

describe('classifyErrorCode — error message to code mapping', () => {
  test('classifies SLUG_MISMATCH from error message', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode(
      'Frontmatter slug "my-friend-mike" does not match path-derived slug "2008-03-20-my-friend-mike"'
    )).toBe('SLUG_MISMATCH');
  });

  test('classifies YAML_PARSE from error message', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode('YAML parse failed: unexpected colon in title')).toBe('YAML_PARSE');
  });

  test('classifies YAML_DUPLICATE_KEY', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode('YAMLException: duplicated mapping key')).toBe('YAML_DUPLICATE_KEY');
  });

  test('classifies STATEMENT_TIMEOUT', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode('canceling statement due to statement timeout')).toBe('STATEMENT_TIMEOUT');
  });

  test('classifies NULL_BYTES', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode('invalid UTF-8: null byte at position 3770')).toBe('NULL_BYTES');
  });

  test('classifies INVALID_UTF8', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode('invalid UTF-8 sequence at position 500')).toBe('INVALID_UTF8');
  });

  test('classifies FILE_TOO_LARGE across all three production sites', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    // src/core/import-file.ts:352 — OS-level file size on disk
    expect(classifyErrorCode('File too large (8432105 bytes)')).toBe('FILE_TOO_LARGE');
    // src/core/import-file.ts:199 — content size limit (5MB cap)
    expect(classifyErrorCode('Content too large (6000000 bytes, max 5000000). Split the content into smaller files or remove large embedded assets.')).toBe('FILE_TOO_LARGE');
    // src/core/import-file.ts:401 — code file size cap
    expect(classifyErrorCode('Code file too large (8000000 bytes)')).toBe('FILE_TOO_LARGE');
  });

  test('classifies SYMLINK_NOT_ALLOWED from import-file.ts symlink rejection', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode('Skipping symlink: /path/to/link.md')).toBe('SYMLINK_NOT_ALLOWED');
  });

  test('returns UNKNOWN for unrecognized errors', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode('something completely different')).toBe('UNKNOWN');
  });
});

describe('summarizeFailuresByCode — grouped summary', () => {
  test('groups failures by classified code', async () => {
    const { summarizeFailuresByCode } = await import('../src/core/sync.ts');
    const summary = summarizeFailuresByCode([
      { error: 'Frontmatter slug "a" does not match path-derived slug "b"' },
      { error: 'Frontmatter slug "c" does not match path-derived slug "d"' },
      { error: 'YAML parse failed: bad colon' },
      { error: 'something unknown' },
    ]);
    expect(summary).toEqual([
      { code: 'SLUG_MISMATCH', count: 2 },
      { code: 'YAML_PARSE', count: 1 },
      { code: 'UNKNOWN', count: 1 },
    ]);
  });

  test('respects pre-classified code field', async () => {
    const { summarizeFailuresByCode } = await import('../src/core/sync.ts');
    const summary = summarizeFailuresByCode([
      { error: 'anything', code: 'SLUG_MISMATCH' },
      { error: 'anything', code: 'SLUG_MISMATCH' },
      { error: 'anything', code: 'YAML_PARSE' },
    ]);
    expect(summary).toEqual([
      { code: 'SLUG_MISMATCH', count: 2 },
      { code: 'YAML_PARSE', count: 1 },
    ]);
  });

  test('returns empty array for no failures', async () => {
    const { summarizeFailuresByCode } = await import('../src/core/sync.ts');
    expect(summarizeFailuresByCode([])).toEqual([]);
  });
});

describe('acknowledgeSyncFailures — structured return', () => {
  test('returns count and code summary', async () => {
    const { recordSyncFailures, acknowledgeSyncFailures } = await import('../src/core/sync.ts');
    recordSyncFailures([
      { path: 'a.md', error: 'Frontmatter slug "x" does not match path-derived slug "y"' },
      { path: 'b.md', error: 'Frontmatter slug "p" does not match path-derived slug "q"' },
      { path: 'c.md', error: 'YAML parse failed: bad' },
    ], 'commit1');

    const result = acknowledgeSyncFailures();
    expect(result.count).toBe(3);
    expect(result.summary).toEqual([
      { code: 'SLUG_MISMATCH', count: 2 },
      { code: 'YAML_PARSE', count: 1 },
    ]);
  });
});

describe('recordSyncFailures — code field', () => {
  test('records classified code alongside error message', async () => {
    const { recordSyncFailures, loadSyncFailures } = await import('../src/core/sync.ts');
    recordSyncFailures([
      { path: 'a.md', error: 'Frontmatter slug "x" does not match path-derived slug "y"' },
    ], 'commit1');

    const entries = loadSyncFailures();
    expect(entries[0].code).toBe('SLUG_MISMATCH');
  });
});

// classifyErrorCode disambiguates Postgres unique-constraint errors from
// YAML duplicate-key errors. Pre-fix, every "duplicate.*key" string mapped
// to YAML_DUPLICATE_KEY, which mislabels DB-layer failures during sync.
describe('classifyErrorCode — DB vs YAML duplicate-key disambiguation', () => {
  test('Postgres unique-constraint violation classifies as DB_DUPLICATE_KEY', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode(
      'duplicate key value violates unique constraint "pages_slug_key"'
    )).toBe('DB_DUPLICATE_KEY');
  });

  test('YAML duplicated mapping key still classifies as YAML_DUPLICATE_KEY', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode('YAMLException: duplicated mapping key "title"'))
      .toBe('YAML_DUPLICATE_KEY');
  });

  test('DB pattern is checked BEFORE YAML so DB errors are not mislabeled', async () => {
    // Both patterns historically matched /duplicate.*key/i — order matters now.
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode(
      'duplicate key value violates unique constraint on table "pages"'
    )).toBe('DB_DUPLICATE_KEY');
    expect(classifyErrorCode(
      'duplicate key value violates unique constraint on table "pages"'
    )).not.toBe('YAML_DUPLICATE_KEY');
  });
});

// classifyErrorCode matches the canonical messages emitted by
// collectValidationErrors() in src/core/markdown.ts. Pre-fix, the regexes
// keyed off "missing open" / "missing close" / "empty frontmatter" — none
// of which are produced upstream. Today these all classify correctly.
describe('classifyErrorCode — canonical message coverage', () => {
  test('MISSING_OPEN matches "File is empty or whitespace-only"', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode(
      'File is empty or whitespace-only; expected frontmatter starting with ---'
    )).toBe('MISSING_OPEN');
  });

  test('MISSING_OPEN matches "Frontmatter must start with ---"', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode(
      'Frontmatter must start with --- on the first non-empty line'
    )).toBe('MISSING_OPEN');
  });

  test('MISSING_CLOSE matches "No closing --- delimiter"', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode('No closing --- delimiter found')).toBe('MISSING_CLOSE');
  });

  test('MISSING_CLOSE matches "Heading at line N found inside frontmatter"', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode(
      'Heading at line 5 found inside frontmatter zone (closing --- comes after)'
    )).toBe('MISSING_CLOSE');
  });

  test('EMPTY_FRONTMATTER matches "Frontmatter block is empty"', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode('Frontmatter block is empty')).toBe('EMPTY_FRONTMATTER');
  });

  test('NULL_BYTES matches "Content contains null bytes"', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode('Content contains null bytes (likely binary corruption)'))
      .toBe('NULL_BYTES');
  });

  test('NESTED_QUOTES matches "Nested double quotes"', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode('Nested double quotes in YAML value at line 3'))
      .toBe('NESTED_QUOTES');
  });
});

// acknowledgeSyncFailures backfills `code` on legacy entries that were
// recorded before the code field existed (~/.gbrain/sync-failures.jsonl
// from pre-PR brains). Without this branch, upgraded users see "UNKNOWN"
// for every previously-recorded failure even when the message is parseable.
describe('acknowledgeSyncFailures — backfill on legacy entries', () => {
  test('backfills code on entries that predate the code field', async () => {
    const { acknowledgeSyncFailures, loadSyncFailures, syncFailuresPath } =
      await import('../src/core/sync.ts');

    // Hand-write a legacy entry with no `code` field. Mimics a pre-PR
    // ~/.gbrain/sync-failures.jsonl row that exists on real upgrades.
    const { mkdirSync } = await import('fs');
    const { dirname } = await import('path');
    mkdirSync(dirname(syncFailuresPath()), { recursive: true });
    writeFileSync(
      syncFailuresPath(),
      JSON.stringify({
        path: 'a.md',
        error: 'Frontmatter slug "x" does not match path-derived slug "y"',
        commit: 'old',
        ts: '2025-01-01T00:00:00Z',
      }) + '\n',
    );

    const result = acknowledgeSyncFailures();
    expect(result.count).toBe(1);
    expect(result.summary).toEqual([{ code: 'SLUG_MISMATCH', count: 1 }]);

    const after = loadSyncFailures();
    expect(after).toHaveLength(1);
    expect(after[0].code).toBe('SLUG_MISMATCH');
    expect(after[0].acknowledged).toBe(true);
  });

  test('preserves existing code field; never reclassifies', async () => {
    const { acknowledgeSyncFailures, loadSyncFailures, syncFailuresPath } =
      await import('../src/core/sync.ts');

    const { mkdirSync } = await import('fs');
    const { dirname } = await import('path');
    mkdirSync(dirname(syncFailuresPath()), { recursive: true });
    // Pre-classified entry — should NOT be re-run through classifier.
    writeFileSync(
      syncFailuresPath(),
      JSON.stringify({
        path: 'a.md',
        error: 'some message that would otherwise classify as UNKNOWN',
        code: 'CUSTOM_CODE',
        commit: 'x',
        ts: '2025-01-01T00:00:00Z',
      }) + '\n',
    );

    const result = acknowledgeSyncFailures();
    expect(result.summary).toEqual([{ code: 'CUSTOM_CODE', count: 1 }]);
    expect(loadSyncFailures()[0].code).toBe('CUSTOM_CODE');
  });
});

// formatCodeBreakdown is the DRY helper used by both the failures-array
// path (sync.ts blocked-by-failures + full-sync stderr) and the pre-summarized
// AcknowledgeResult.summary path (--skip-failed ack message). One renderer,
// two input shapes.
describe('formatCodeBreakdown — dual input shape', () => {
  test('renders raw failures by classifying internally', async () => {
    const { formatCodeBreakdown } = await import('../src/core/sync.ts');
    const out = formatCodeBreakdown([
      { error: 'Frontmatter slug "a" does not match path-derived slug "b"' },
      { error: 'Frontmatter slug "c" does not match path-derived slug "d"' },
      { error: 'YAML parse failed: bad' },
    ]);
    expect(out).toBe('  SLUG_MISMATCH: 2\n  YAML_PARSE: 1');
  });

  test('renders pre-summarized {code, count} input directly', async () => {
    const { formatCodeBreakdown } = await import('../src/core/sync.ts');
    const out = formatCodeBreakdown([
      { code: 'SLUG_MISMATCH', count: 5 },
      { code: 'YAML_PARSE', count: 2 },
    ]);
    expect(out).toBe('  SLUG_MISMATCH: 5\n  YAML_PARSE: 2');
  });

  test('returns empty string for empty input', async () => {
    const { formatCodeBreakdown } = await import('../src/core/sync.ts');
    expect(formatCodeBreakdown([])).toBe('');
  });
});

// v0.41.6.0 D2 — embedding error classifier patterns.
// Verbatim provider error strings extracted from:
//   src/core/ai/gateway.ts:973-988 (native-openai / native-google)
//   src/core/ai/gateway.ts:995-997 (native-anthropic — no-touchpoint shape)
//   src/core/ai/gateway.ts:250     (defaultResolveAuth — openai-compatible)
// Each test pins a real-shaped message so a future provider-rename
// (recipe.name change) will fail loudly here instead of silently
// re-bucketing to UNKNOWN.
describe('v0.41.6.0 D2 — embedding error classification', () => {
  test('EMBEDDING_NO_CREDS matches native-openai verbatim throw', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode('OpenAI embedding requires OPENAI_API_KEY.')).toBe('EMBEDDING_NO_CREDS');
  });

  test('EMBEDDING_NO_CREDS matches native-google verbatim throw', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode(
      'Google embedding requires GOOGLE_GENERATIVE_AI_API_KEY.'
    )).toBe('EMBEDDING_NO_CREDS');
  });

  test('EMBEDDING_NO_CREDS matches Voyage AI openai-compat shape', async () => {
    // defaultResolveAuth template: "${recipe.name} embedding requires ${REQUIRED_ENV}."
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode('Voyage AI embedding requires VOYAGE_API_KEY.')).toBe('EMBEDDING_NO_CREDS');
  });

  test('EMBEDDING_NO_CREDS matches ZeroEntropy openai-compat shape', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode('ZeroEntropy embedding requires ZEROENTROPY_API_KEY.')).toBe('EMBEDDING_NO_CREDS');
  });

  test('EMBEDDING_NO_CREDS matches DeepSeek openai-compat shape', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode('DeepSeek embedding requires DEEPSEEK_API_KEY.')).toBe('EMBEDDING_NO_CREDS');
  });

  test('EMBEDDING_NO_CREDS matches the literal token (back-compat)', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode('EMBEDDING_NO_CREDS — VOYAGE_API_KEY missing')).toBe('EMBEDDING_NO_CREDS');
  });

  test('EMBEDDING_NO_TOUCHPOINT matches anthropic-as-embed-provider misconfig', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode(
      'Anthropic has no embedding model. Use openai or google for embeddings.'
    )).toBe('EMBEDDING_NO_TOUCHPOINT');
  });

  test('EMBEDDING_RATE_LIMIT matches HTTP 429 phrasing', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode('Request failed with status 429: rate limit exceeded')).toBe('EMBEDDING_RATE_LIMIT');
  });

  test('EMBEDDING_RATE_LIMIT matches OpenAI "too many requests" phrasing', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode('OpenAIRateLimitError: too many requests in 1m'))
      .toBe('EMBEDDING_RATE_LIMIT');
  });

  test('EMBEDDING_QUOTA matches OpenAI insufficient_quota error', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode(
      'You exceeded your current quota, please check your plan and billing details. error code: insufficient_quota'
    )).toBe('EMBEDDING_QUOTA');
  });

  test('EMBEDDING_QUOTA matches Anthropic credit-balance message', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode('Your credit balance is too low to continue'))
      .toBe('EMBEDDING_QUOTA');
  });

  test('EMBEDDING_OVERSIZE matches OpenAI max-context-length error', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode(
      "This model's maximum context length is 8192 tokens, however you requested 9001 tokens"
    )).toBe('EMBEDDING_OVERSIZE');
  });

  test('EMBEDDING_OVERSIZE matches max_tokens shape', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode('max_tokens exceeded for embedding input')).toBe('EMBEDDING_OVERSIZE');
  });

  test('EMBEDDING_OVERSIZE matches Voyage "input length exceeds" shape', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode('input length exceeds maximum')).toBe('EMBEDDING_OVERSIZE');
  });

  // Negative regression cases — make sure new patterns don't steal existing patterns' messages.
  test('FILE_TOO_LARGE still classifies correctly (not overridden by new patterns)', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode('File too large: 5242881 bytes')).toBe('FILE_TOO_LARGE');
  });

  test('STATEMENT_TIMEOUT still classifies correctly', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode('canceling statement due to statement timeout')).toBe('STATEMENT_TIMEOUT');
  });

  test('SLUG_MISMATCH still classifies correctly', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode(
      'Frontmatter slug "x" does not match path-derived slug "y"'
    )).toBe('SLUG_MISMATCH');
  });

  test('UNKNOWN still fires when no pattern matches', async () => {
    const { classifyErrorCode } = await import('../src/core/sync.ts');
    expect(classifyErrorCode('some random unmatched error message')).toBe('UNKNOWN');
  });
});
