import { describe, test, expect, beforeAll, afterAll, spyOn } from 'bun:test';
import { LATEST_VERSION, runMigrations, MIGRATIONS, getIdleBlockers, hasPendingMigrations } from '../src/core/migrate.ts';
import type { IdleBlocker } from '../src/core/migrate.ts';
import type { BrainEngine } from '../src/core/engine.ts';
import { PGLiteEngine } from '../src/core/pglite-engine.ts';
import { readFileSync } from 'fs';
import { resolve } from 'path';

describe('migrate', () => {
  test('LATEST_VERSION is a number >= 1', () => {
    expect(typeof LATEST_VERSION).toBe('number');
    expect(LATEST_VERSION).toBeGreaterThanOrEqual(1);
  });

  test('runMigrations is exported and callable', async () => {
    expect(typeof runMigrations).toBe('function');
  });

  // Integration tests for actual migration execution require DATABASE_URL
  // and are covered in the E2E suite (test/e2e/mechanical.test.ts)
});

// v0.28.5 — A1: cheap probe used by `connectEngine` to gate `initSchema()`
// so already-migrated brains don't pay the schema-replay cost on every
// short-lived CLI invocation. Closes #651 in cooperation with X1's
// post-upgrade auto-apply, without #652's perf regression.
describe('hasPendingMigrations', () => {
  test('returns false on a fully-migrated brain (version === LATEST)', async () => {
    const engine = new PGLiteEngine();
    await engine.connect({});
    try {
      await engine.initSchema(); // applies all migrations through LATEST_VERSION
      expect(await hasPendingMigrations(engine)).toBe(false);
    } finally {
      await engine.disconnect();
    }
  }, 30000);

  test('returns true when version config is behind LATEST_VERSION', async () => {
    const engine = new PGLiteEngine();
    await engine.connect({});
    try {
      await engine.initSchema();
      // Simulate an older brain by rewinding the version row.
      await engine.setConfig('version', '1');
      expect(await hasPendingMigrations(engine)).toBe(true);
    } finally {
      await engine.disconnect();
    }
  }, 30000);

  test('returns true when version config is missing entirely (defensive default)', async () => {
    const engine = new PGLiteEngine();
    await engine.connect({});
    try {
      // Don't call initSchema. Probe against an empty PGlite — getConfig should
      // either return null (treated as version=1) or throw on missing config
      // table; either way the probe must say "yes pending."
      expect(await hasPendingMigrations(engine)).toBe(true);
    } finally {
      await engine.disconnect();
    }
  }, 30000);
});

// ─────────────────────────────────────────────────────────────────
// v0.18.0 — v16 sources_table_additive (Step 1, Lane A)
// ─────────────────────────────────────────────────────────────────
// v16 is the ADDITIVE-ONLY migration: it installs the sources primitive
// without breaking the engine's existing ON CONFLICT (slug) upserts.
// The breaking schema changes (pages.source_id NOT NULL, composite
// UNIQUE, files.page_slug → page_id, file_migration_ledger,
// links.resolution_type) land in v17 alongside the engine API rewrite
// so the engine can execute the new ON CONFLICT (source_id, slug)
// atomically with the schema change.
// ─────────────────────────────────────────────────────────────────
describe('migrate v20 — sources_table_additive', () => {
  const v20 = MIGRATIONS.find(m => m.version === 20);

  test('v20 exists', () => {
    expect(v20).toBeDefined();
    expect(v20!.name).toBe('sources_table_additive');
  });

  test('v20 creates sources table', () => {
    expect(v20!.sql).toContain('CREATE TABLE IF NOT EXISTS sources');
    expect(v20!.sql).toContain('id            TEXT PRIMARY KEY');
    expect(v20!.sql).toContain('name          TEXT NOT NULL UNIQUE');
    expect(v20!.sql).toContain('config        JSONB NOT NULL');
  });

  test("v20 seeds 'default' source inheriting sync config", () => {
    expect(v20!.sql).toContain("INSERT INTO sources (id, name, local_path, last_commit, config)");
    expect(v20!.sql).toContain("'default'");
    // The default source pulls from existing config so post-upgrade
    // identity is preserved.
    expect(v20!.sql).toContain("SELECT value FROM config WHERE key = 'sync.repo_path'");
    expect(v20!.sql).toContain("SELECT value FROM config WHERE key = 'sync.last_commit'");
  });

  test('v20 default source is federated=true (backward-compat)', () => {
    // federated=true ensures pre-v0.17 brains keep single-namespace
    // search semantics — every page appears in unqualified search.
    expect(v20!.sql).toContain('"federated": true');
  });

  test('v20 is idempotent on re-run', () => {
    // CREATE TABLE IF NOT EXISTS + NOT EXISTS subquery on INSERT.
    expect(v20!.sql).toContain('CREATE TABLE IF NOT EXISTS sources');
    expect(v20!.sql).toContain('WHERE NOT EXISTS (SELECT 1 FROM sources WHERE id = ');
  });

  test('v20 does NOT touch pages / ingest_log / files / links', () => {
    // Step 1 is additive-only. Breaking changes deferred to v17 so they
    // land with the engine rewrite (Step 2). Guard against anyone
    // accidentally re-expanding v16's scope.
    expect(v20!.sql).not.toContain('ALTER TABLE pages');
    expect(v20!.sql).not.toContain('ALTER TABLE ingest_log');
    expect(v20!.sql).not.toContain('ALTER TABLE files');
    expect(v20!.sql).not.toContain('ALTER TABLE links');
    expect(v20!.handler).toBeUndefined();
  });
});

// ─────────────────────────────────────────────────────────────────
// v0.18.0 — v17 pages_source_id_composite_unique (Step 2, Lane B)
// ─────────────────────────────────────────────────────────────────
// ─────────────────────────────────────────────────────────────────
// v0.26.3 — v33 admin_dashboard_columns_v0_26_3
// ─────────────────────────────────────────────────────────────────
// SQL-shape guard: PR #586 referenced 5 columns + a new index that didn't
// exist in any prior migration. Without v33, /admin/api/agents 503s and
// the request-log INSERT silently swallows column-doesn't-exist errors.
// This test pins the column set so a future refactor can't silently drop
// part of the migration without the test failing.
describe('migrate v33 — admin_dashboard_columns_v0_26_3', () => {
  const v33 = MIGRATIONS.find(m => m.version === 33);

  test('v33 exists with the expected name', () => {
    expect(v33).toBeDefined();
    expect(v33!.name).toBe('admin_dashboard_columns_v0_26_3');
  });

  test('v33 adds all 5 columns referenced by serve-http.ts and oauth-provider.ts', () => {
    const sql = v33!.sql;
    expect(sql).toContain('ALTER TABLE oauth_clients');
    expect(sql).toContain('ADD COLUMN IF NOT EXISTS token_ttl INTEGER');
    expect(sql).toContain('ADD COLUMN IF NOT EXISTS deleted_at TIMESTAMPTZ');
    expect(sql).toContain('ALTER TABLE mcp_request_log');
    expect(sql).toContain('ADD COLUMN IF NOT EXISTS agent_name TEXT');
    expect(sql).toContain('ADD COLUMN IF NOT EXISTS params JSONB');
    expect(sql).toContain('ADD COLUMN IF NOT EXISTS error_message TEXT');
  });

  test('v33 backfills mcp_request_log.agent_name from oauth_clients + access_tokens', () => {
    const sql = v33!.sql;
    expect(sql).toContain('UPDATE mcp_request_log');
    expect(sql).toContain('SET agent_name = COALESCE(');
    expect(sql).toContain('FROM oauth_clients WHERE client_id = m.token_name');
    expect(sql).toContain('FROM access_tokens WHERE name = m.token_name');
    expect(sql).toContain('WHERE agent_name IS NULL');
  });

  test('v33 creates idx_mcp_log_agent_time for the new agent filter', () => {
    expect(v33!.sql).toContain('idx_mcp_log_agent_time');
    expect(v33!.sql).toContain('mcp_request_log(agent_name, created_at DESC)');
  });

  test('v33 uses ADD COLUMN IF NOT EXISTS so re-runs are idempotent', () => {
    // All ALTER lines must be IF NOT EXISTS — re-running migrations on a
    // brain that already has v33 columns must be a no-op, not a duplicate
    // column error.
    const sql = v33!.sql;
    const addColumnLines = sql.match(/ADD COLUMN[^,;]+/gi) || [];
    expect(addColumnLines.length).toBeGreaterThanOrEqual(5);
    for (const line of addColumnLines) {
      expect(line).toContain('IF NOT EXISTS');
    }
  });
});

// ============================================================
// v0.27 — v35 subagent_provider_neutral_persistence_v0_27
// ============================================================
// Codex F-OV-1 / D11. The subagent_messages and subagent_tool_executions
// tables stored Anthropic-shaped tool_use / tool_result blocks as JSONB.
// When a worker resumes mid-loop and the live model is OpenAI/DeepSeek/etc,
// the persisted shape is the runtime contract — translation at read time
// is lossy.
//
// Fix: schema_version + provider_id columns. v=1 = legacy Anthropic shape,
// v=2 = provider-neutral ChatBlock format (commit 2). subagent.ts (commit
// 2) writes v=2 going forward.
//
// Renumbered v34→v35→v36 across master merges: master's v34
// (destructive_guard_columns) and v35 (auto_rls_event_trigger) landed first.
describe('migrate v36 — subagent_provider_neutral_persistence_v0_27', () => {
  const v36 = MIGRATIONS.find(m => m.version === 36);

  test('v36 exists with the expected name', () => {
    expect(v36).toBeDefined();
    expect(v36!.name).toBe('subagent_provider_neutral_persistence_v0_27');
  });

  test('v36 adds schema_version + provider_id to both subagent tables', () => {
    const sql = v36!.sql;
    expect(sql).toContain('ALTER TABLE subagent_messages');
    expect(sql).toContain('ALTER TABLE subagent_tool_executions');
    // schema_version present in both tables
    const schemaVersionMatches = sql.match(/ADD COLUMN IF NOT EXISTS schema_version INTEGER NOT NULL DEFAULT 1/g) || [];
    expect(schemaVersionMatches.length).toBe(2);
    // provider_id present in both tables
    const providerIdMatches = sql.match(/ADD COLUMN IF NOT EXISTS provider_id TEXT/g) || [];
    expect(providerIdMatches.length).toBe(2);
  });

  test('v36 keeps DEFAULT 1 so existing rows are taggable as legacy Anthropic shape', () => {
    // Existing rows backfill to schema_version=1 (legacy) automatically via
    // DEFAULT. No explicit UPDATE needed; subagent.ts read path checks the
    // version and dispatches the right mapper.
    expect(v36!.sql).toContain('DEFAULT 1');
  });

  test('v36 creates idx_subagent_messages_provider for cost rollups', () => {
    expect(v36!.sql).toContain('idx_subagent_messages_provider');
    expect(v36!.sql).toContain('subagent_messages (job_id, provider_id)');
  });

  test('v36 ALTERs are idempotent (ADD COLUMN IF NOT EXISTS)', () => {
    const sql = v36!.sql;
    const addColumnLines = sql.match(/ADD COLUMN[^,;]+/gi) || [];
    expect(addColumnLines.length).toBe(4);
    for (const line of addColumnLines) {
      expect(line).toContain('IF NOT EXISTS');
    }
    // Index creation must also be idempotent.
    expect(sql).toContain('CREATE INDEX IF NOT EXISTS');
  });

  test('PGLite fresh-install schema reflects v36 columns', async () => {
    const { PGLITE_SCHEMA_SQL } = await import('../src/core/pglite-schema.ts');
    expect(PGLITE_SCHEMA_SQL).toContain('schema_version      INTEGER     NOT NULL DEFAULT 1');
    expect(PGLITE_SCHEMA_SQL).toContain('provider_id         TEXT');
    expect(PGLITE_SCHEMA_SQL).toContain('idx_subagent_messages_provider');
  });

  test('embedded schema (src/core/schema-embedded.ts) reflects v36 columns', async () => {
    const { SCHEMA_SQL } = await import('../src/core/schema-embedded.ts');
    expect(SCHEMA_SQL).toContain('schema_version');
    expect(SCHEMA_SQL).toContain('provider_id');
    expect(SCHEMA_SQL).toContain('idx_subagent_messages_provider');
  });
});

describe('migrate v21 — pages_source_id_composite_unique', () => {
  const v21 = MIGRATIONS.find(m => m.version === 21);

  test('v21 exists and is paired with Step 2 engine rewrite', () => {
    expect(v21).toBeDefined();
    expect(v21!.name).toBe('pages_source_id_composite_unique');
  });

  // Post-codex restructure: v21 is engine-split.
  // Postgres path = additive only (source_id + index). The UNIQUE swap
  // and files_page_slug_fkey drop moved into v23's atomic transaction.
  // PGLite path = full (add + unique swap) because PGLite has no
  // concurrent writers so the integrity window doesn't apply.
  test('v21 uses sqlFor for engine-specific paths (post-codex)', () => {
    expect(v21!.sql).toBe('');
    expect(v21!.sqlFor).toBeDefined();
    expect(v21!.sqlFor!.postgres).toBeDefined();
    expect(v21!.sqlFor!.pglite).toBeDefined();
  });

  test('v21 Postgres path: additive only (source_id + index)', () => {
    const pg = v21!.sqlFor!.postgres!;
    expect(pg).toContain('ALTER TABLE pages ADD COLUMN IF NOT EXISTS source_id TEXT');
    // DEFAULT 'default' closes the race where an INSERT between ADD COLUMN
    // and SET NOT NULL could leave source_id NULL (Codex second-pass review).
    expect(pg).toContain("NOT NULL DEFAULT 'default' REFERENCES sources(id)");
    expect(pg).toContain('CREATE INDEX IF NOT EXISTS idx_pages_source_id');
    // The UNIQUE swap and files FK drop must NOT be in the Postgres path.
    // They moved into v23's atomic transaction to close the partial-state
    // window codex identified.
    expect(pg).not.toContain('pages_slug_key');
    expect(pg).not.toContain('files_page_slug_fkey');
  });

  test('v21 PGLite path: additive + UNIQUE swap (no integrity window)', () => {
    const pgl = v21!.sqlFor!.pglite!;
    expect(pgl).toContain('ALTER TABLE pages ADD COLUMN IF NOT EXISTS source_id TEXT');
    expect(pgl).toContain('CREATE INDEX IF NOT EXISTS idx_pages_source_id');
    // PGLite swaps the unique here (no files table means no FK to drop).
    expect(pgl).toContain('ALTER TABLE pages DROP CONSTRAINT IF EXISTS pages_slug_key');
    expect(pgl).toContain('pages_source_slug_key');
    expect(pgl).toContain('UNIQUE (source_id, slug)');
    // PGLite path doesn't touch files (doesn't exist on PGLite).
    expect(pgl).not.toContain('files_page_slug_fkey');
  });
});

// ─────────────────────────────────────────────────────────────────
// v0.18.0 — v19 files_source_id_page_id_ledger (Step 7, Lane E)
// ─────────────────────────────────────────────────────────────────
describe('migrate v23 — files_source_id_page_id_ledger', () => {
  const v23 = MIGRATIONS.find(m => m.version === 23);

  test('v23 exists as handler-only (Postgres files table, PGLite no-op)', () => {
    expect(v23).toBeDefined();
    expect(v23!.name).toBe('files_source_id_page_id_ledger');
    expect(v23!.sql).toBe('');
    expect(v23!.handler).toBeDefined();
  });

  test('v23 handler gates on engine.kind for PGLite (no files table)', () => {
    expect(v23!.handler!.toString()).toMatch(/engine\.kind\s*===\s*["']pglite["']/);
  });

  test('v23 adds files.source_id + files.page_id + ledger creation', () => {
    const body = v23!.handler!.toString();
    expect(body).toContain('ALTER TABLE files ADD COLUMN IF NOT EXISTS source_id');
    expect(body).toContain('ALTER TABLE files ADD COLUMN IF NOT EXISTS page_id');
    expect(body).toContain('CREATE TABLE IF NOT EXISTS file_migration_ledger');
  });

  test('v23 is atomic: wraps all work in engine.transaction (integrity-window fix)', () => {
    const body = v23!.handler!.toString();
    // Codex caught: if files_page_slug_fkey is dropped in v21 but the
    // replacement files.page_id is only added in v23, a process-death
    // between v21 and v23 leaves files permanently unconstrained.
    // Fix: move BOTH the FK drop AND the pages UNIQUE swap into v23,
    // wrap everything in engine.transaction so it commits atomically.
    expect(body).toContain('engine.transaction');
    expect(body).toContain('files_page_slug_fkey');
    expect(body).toContain('pages_slug_key');
    expect(body).toContain('pages_source_slug_key');
  });

  test('v23 backfills files.page_id scoped to default source (Codex fix)', () => {
    const body = v23!.handler!.toString();
    // Without source_id='default' scope, the JOIN could hit the wrong
    // page after new sources with duplicate slugs are added.
    expect(body).toContain('UPDATE files f');
    expect(body).toContain("p.source_id = 'default'");
  });

  test('v23 ledger PK is file_id (Codex: two sources can share old path)', () => {
    const body = v23!.handler!.toString();
    expect(body).toContain('file_id           INTEGER PRIMARY KEY');
    // State machine values all present.
    for (const state of ['pending', 'copy_done', 'db_updated', 'complete', 'failed']) {
      expect(body).toContain(`'${state}'`);
    }
  });
});

describe('migrate — ordering guarantee (v15 must NOT be skipped by v16)', () => {
  test('runMigrations sorts by version ascending', async () => {
    // Regression: if v16 preceded v15 in the MIGRATIONS array, the iterator
    // would setConfig(version, 16) first, then skip v15 on the next pass.
    // runMigrations applies a defensive sort so array order doesn't matter.
    // This test asserts v15 exists (if we broke the sort, v15 would still
    // exist in MIGRATIONS but would never apply at runtime).
    const v15 = MIGRATIONS.find(m => m.version === 15);
    const v20 = MIGRATIONS.find(m => m.version === 20);
    expect(v15).toBeDefined();
    expect(v20).toBeDefined();
    // Sanity: versions are distinct and progress.
    const versions = MIGRATIONS.map(m => m.version);
    const uniq = new Set(versions);
    expect(uniq.size).toBe(versions.length);
  });
});

// ─────────────────────────────────────────────────────────────────
// v0.18.1 RLS hardening — structural guard for migration v24
// ─────────────────────────────────────────────────────────────────
//
// The base schema shipped 8 gbrain-managed public tables without RLS
// enabled (access_tokens, mcp_request_log, minion_inbox,
// minion_attachments, subagent_messages, subagent_tool_executions,
// subagent_rate_leases, gbrain_cycle_locks). Migration v12 created
// two more (budget_ledger, budget_reservations) without RLS.
// Migration v24 backfills the ENABLE RLS statements for existing
// brains. This test guards against regressions where the migration
// gets truncated or the wrong tables get enabled.

describe('migration v24 — rls_backfill_missing_tables', () => {
  const RLS_BACKFILL_TABLES = [
    'access_tokens',
    'mcp_request_log',
    'minion_inbox',
    'minion_attachments',
    'subagent_messages',
    'subagent_tool_executions',
    'subagent_rate_leases',
    'gbrain_cycle_locks',
    'budget_ledger',
    'budget_reservations',
  ];

  test('exists with the expected name', () => {
    const v24 = MIGRATIONS.find(m => m.version === 24);
    expect(v24).toBeDefined();
    expect(v24?.name).toBe('rls_backfill_missing_tables');
  });

  test('enables RLS on all 10 backfill tables', () => {
    const v24 = MIGRATIONS.find(m => m.version === 24);
    expect(v24).toBeDefined();
    const sql = v24!.sql || '';
    for (const tbl of RLS_BACKFILL_TABLES) {
      expect(sql).toContain(`ALTER TABLE ${tbl} ENABLE ROW LEVEL SECURITY`);
    }
  });

  test('is gated on BYPASSRLS so it never locks a non-bypass session out of its data', () => {
    const v24 = MIGRATIONS.find(m => m.version === 24);
    const sql = v24!.sql || '';
    expect(sql).toContain('rolbypassrls');
    // The gate can be either IF has_bypass / early-raise pattern.
    expect(sql).toMatch(/IF (NOT )?has_bypass/);
  });

  // Self-healing guard: the budget_* tables are migration-only (v12). If an
  // operator manually dropped them, or if a brain was somehow pinned to a
  // pre-v12 version when those tables didn't exist, a bare `ALTER TABLE
  // budget_ledger ...` would fail with 42P01 and abort v24. Wrapping those
  // two ALTERs in an `IF EXISTS (information_schema.tables ...)` check lets
  // the migration skip them silently instead of erroring out. The other 8
  // tables are created by schema.sql on every initSchema and don't need
  // the guard — bare ALTER is fine.
  test('guards budget_ledger + budget_reservations with information_schema.tables IF EXISTS', () => {
    const v24 = MIGRATIONS.find(m => m.version === 24);
    const sql = v24!.sql || '';
    // Both budget tables must be wrapped in an existence check.
    expect(sql).toMatch(
      /IF EXISTS \(SELECT 1 FROM information_schema\.tables[\s\S]{0,200}table_name = 'budget_ledger'\)[\s\S]{0,200}ALTER TABLE budget_ledger ENABLE ROW LEVEL SECURITY/,
    );
    expect(sql).toMatch(
      /IF EXISTS \(SELECT 1 FROM information_schema\.tables[\s\S]{0,200}table_name = 'budget_reservations'\)[\s\S]{0,200}ALTER TABLE budget_reservations ENABLE ROW LEVEL SECURITY/,
    );
  });

  // Codex found: if v24 RAISE WARNINGs instead of raising on non-BYPASSRLS,
  // the migration runner still bumps schema_version to 24, permanently
  // skipping the backfill on future runs even after the role is fixed.
  // The fix is to raise loudly so the transaction aborts, version stays
  // at 23, and the next initSchema call retries after role reassignment.
  test('fails loudly on non-BYPASSRLS roles instead of silently bumping version', () => {
    const v24 = MIGRATIONS.find(m => m.version === 24);
    const sql = v24!.sql || '';
    expect(sql).toMatch(/RAISE EXCEPTION[^;]*BYPASSRLS/);
    expect(sql).not.toMatch(/RAISE WARNING[^;]*BYPASSRLS/);
  });

  test('LATEST_VERSION has caught up to 24', () => {
    expect(LATEST_VERSION).toBeGreaterThanOrEqual(24);
  });

  // PGLite has no RLS engine and is intrinsically single-tenant. The 8 RLS
  // backfill ALTER statements target tables that may not exist on PGLite
  // (subagent_*, minion_inbox aren't always present in pglite-schema.ts).
  // sqlFor.pglite='' makes v24 a no-op on PGLite while still bumping the
  // version counter. Engine.kind discrimination in runMigrations selects
  // sqlFor[engine.kind] over m.sql. Issue #395.
  test('uses a PGLite no-op override so local brains skip Postgres-only RLS ALTER TABLEs', () => {
    const v24 = MIGRATIONS.find(m => m.version === 24);
    expect(v24?.sqlFor?.pglite).toBe('');
  });
});

// ─────────────────────────────────────────────────────────────────
// v0.26.7 — migration v35 structural guards (auto-RLS event trigger)
// ─────────────────────────────────────────────────────────────────
//
// The PR review caught that the original v35 had three correctness issues:
//   - FORCE ROW LEVEL SECURITY locked out non-BYPASSRLS table owners.
//   - Trigger fired on Supabase-managed schemas (auth/storage/realtime/...).
//   - EXCEPTION WHEN OTHERS would silently swallow per-table failures and
//     replace a transactional rollback (loud) with a permissive default (quiet).
// These tests pin the corrected shape so a future revert can't reintroduce
// the original bugs.
describe('migration v35 — auto_rls_event_trigger structural guards', () => {
  test('exists with the expected name and SQL shape', () => {
    const v35 = MIGRATIONS.find(m => m.version === 35);
    expect(v35).toBeDefined();
    expect(v35?.name).toBe('auto_rls_event_trigger');
    expect((v35?.sqlFor as any)?.postgres?.length).toBeGreaterThan(0);
  });

  test('uses a PGLite no-op override (no event trigger support on PGLite)', () => {
    const v35 = MIGRATIONS.find(m => m.version === 35);
    expect(v35?.sqlFor?.pglite).toBe('');
  });

  test('does NOT issue FORCE ROW LEVEL SECURITY (D1: ENABLE only)', () => {
    const v35 = MIGRATIONS.find(m => m.version === 35);
    const sql = ((v35?.sqlFor as any)?.postgres ?? '') as string;
    expect(sql).not.toMatch(/FORCE\s+ROW\s+LEVEL\s+SECURITY/i);
    expect(sql).toMatch(/ENABLE\s+ROW\s+LEVEL\s+SECURITY/i);
  });

  test('trigger function is scoped to schema_name = public (D2)', () => {
    const v35 = MIGRATIONS.find(m => m.version === 35);
    const sql = ((v35?.sqlFor as any)?.postgres ?? '') as string;
    expect(sql).toMatch(/schema_name\s*=\s*'public'/);
  });

  test('WHEN TAG covers CREATE TABLE, CREATE TABLE AS, and SELECT INTO (D6)', () => {
    const v35 = MIGRATIONS.find(m => m.version === 35);
    const sql = ((v35?.sqlFor as any)?.postgres ?? '') as string;
    expect(sql).toMatch(/WHEN\s+TAG\s+IN\s*\([^)]*'CREATE TABLE'[^)]*\)/i);
    expect(sql).toMatch(/'CREATE TABLE AS'/);
    expect(sql).toMatch(/'SELECT INTO'/);
  });

  test('does NOT contain EXCEPTION WHEN OTHERS inside the trigger function (D5 reversed)', () => {
    const v35 = MIGRATIONS.find(m => m.version === 35);
    const sql = ((v35?.sqlFor as any)?.postgres ?? '') as string;
    // ddl_command_end fires inside the DDL transaction, so a failed ALTER
    // aborts the offending CREATE TABLE — that's the security guarantee.
    // Wrapping in EXCEPTION WHEN OTHERS would convert that loud rollback
    // into a silent permissive default. Pin the absence.
    expect(sql.toUpperCase()).not.toContain('EXCEPTION WHEN OTHERS');
  });

  test('backfill block uses %I.%I identifier quoting (codex correction)', () => {
    const v35 = MIGRATIONS.find(m => m.version === 35);
    const sql = ((v35?.sqlFor as any)?.postgres ?? '') as string;
    // The backfill iterates pg_class and ALTERs each non-exempt RLS-off public
    // table. Mixed-case identifiers require %I quoting; raw concat would break.
    expect(sql).toMatch(/format\(\s*'ALTER TABLE %I\.%I/);
  });

  test('backfill exemption regex matches the doctor.ts contract', () => {
    const v35 = MIGRATIONS.find(m => m.version === 35);
    const sql = ((v35?.sqlFor as any)?.postgres ?? '') as string;
    // doctor.ts:418 EXEMPT_RE = /^GBRAIN:RLS_EXEMPT\s+reason=\S.{3,}/
    // The plpgsql side must use the same pattern (via ~) so the two surfaces
    // honor identical exemptions.
    expect(sql).toMatch(/'\^GBRAIN:RLS_EXEMPT\\s\+reason=\\S\.\{3,\}'/);
  });

  test('backfill is gated on rolbypassrls (matches v24 posture)', () => {
    const v35 = MIGRATIONS.find(m => m.version === 35);
    const sql = ((v35?.sqlFor as any)?.postgres ?? '') as string;
    expect(sql).toMatch(/rolbypassrls/);
    expect(sql).toMatch(/RAISE\s+EXCEPTION/i);
  });
});

// ─────────────────────────────────────────────────────────────────
// REGRESSION TESTS — migrations v8 + v9 perf on duplicate-heavy tables
// ─────────────────────────────────────────────────────────────────
//
// Garry's production brain hit Supabase Management API's 60s ceiling because
// the DELETE...USING self-join in migrations v8 + v9 was O(n²) without an
// index on the dedup columns. The fix pre-creates a btree helper index
// before the DELETE, then drops it. These tests guard against any future
// change that re-introduces the missing helper index.
//
// Two-layer guard:
//   1. Structural — assert the migration SQL literally contains the helper
//      CREATE INDEX + DROP INDEX (deterministic, fast, catches the regression
//      even at 0-row scale where wall-clock can't distinguish O(n²) from O(1)).
//   2. Behavioral — populate 1000 duplicates and assert the migration completes
//      under the wall-clock cap. Sanity check at small scale; the structural
//      assertion is the real guard.

describe('migrations v8 + v9 — structural guard for helper-index fix', () => {
  test('migration v8 SQL contains idx_links_dedup_helper CREATE+DROP around the DELETE', () => {
    const v8 = MIGRATIONS.find(m => m.version === 8);
    expect(v8).toBeDefined();
    const sql = v8!.sql;

    // The fix must: (a) create the helper btree, (b) DELETE...USING, (c) drop the helper, (d) add the unique constraint.
    // If anyone reorders or removes the helper-index lines, this fails.
    expect(sql).toContain('CREATE INDEX IF NOT EXISTS idx_links_dedup_helper');
    expect(sql).toContain('ON links(from_page_id, to_page_id, link_type)');
    expect(sql).toContain('DROP INDEX IF EXISTS idx_links_dedup_helper');
    expect(sql).toContain('DELETE FROM links a USING links b');
    expect(sql).toContain('ALTER TABLE links ADD CONSTRAINT links_from_to_type_unique');

    // Order matters: CREATE INDEX before DELETE, DROP INDEX after DELETE, before ADD CONSTRAINT.
    const createIdx = sql.indexOf('CREATE INDEX IF NOT EXISTS idx_links_dedup_helper');
    const deleteUsing = sql.indexOf('DELETE FROM links a USING links b');
    const dropIdx = sql.indexOf('DROP INDEX IF EXISTS idx_links_dedup_helper');
    const addConstraint = sql.indexOf('ALTER TABLE links ADD CONSTRAINT links_from_to_type_unique');
    expect(createIdx).toBeLessThan(deleteUsing);
    expect(deleteUsing).toBeLessThan(dropIdx);
    expect(dropIdx).toBeLessThan(addConstraint);
  });

  test('migration v9 SQL contains idx_timeline_dedup_helper CREATE+DROP around the DELETE', () => {
    const v9 = MIGRATIONS.find(m => m.version === 9);
    expect(v9).toBeDefined();
    const sql = v9!.sql;

    expect(sql).toContain('CREATE INDEX IF NOT EXISTS idx_timeline_dedup_helper');
    expect(sql).toContain('ON timeline_entries(page_id, date, summary)');
    expect(sql).toContain('DROP INDEX IF EXISTS idx_timeline_dedup_helper');
    expect(sql).toContain('DELETE FROM timeline_entries a USING timeline_entries b');
    expect(sql).toContain('CREATE UNIQUE INDEX IF NOT EXISTS idx_timeline_dedup');

    const createHelper = sql.indexOf('CREATE INDEX IF NOT EXISTS idx_timeline_dedup_helper');
    const deleteUsing = sql.indexOf('DELETE FROM timeline_entries a USING timeline_entries b');
    const dropHelper = sql.indexOf('DROP INDEX IF EXISTS idx_timeline_dedup_helper');
    const createUnique = sql.indexOf('CREATE UNIQUE INDEX IF NOT EXISTS idx_timeline_dedup');
    expect(createHelper).toBeLessThan(deleteUsing);
    expect(deleteUsing).toBeLessThan(dropHelper);
    expect(dropHelper).toBeLessThan(createUnique);
  });
});

// v0.14.1 — fix wave structural assertions (migrations renumbered from v12/v13 to
// v14/v15 after master merged budget_ledger (v12) + minion_quiet_hours_stagger (v13)).
describe('migrate v14 — pages_updated_at_index (handler-based, engine-aware)', () => {
  const v14 = MIGRATIONS.find(m => m.version === 14);
  test('v14 exists and uses a handler (not pure SQL) for engine-aware branching', () => {
    expect(v14).toBeDefined();
    expect(v14!.name).toBe('pages_updated_at_index');
    expect(typeof v14!.handler).toBe('function');
    expect(v14!.sql).toBe('');
  });

  test('v14 handler source contains CONCURRENTLY + invalid-index cleanup for Postgres branch', async () => {
    const { readFileSync } = await import('fs');
    const src = readFileSync('src/core/migrate.ts', 'utf-8');
    const v14Start = src.indexOf("name: 'pages_updated_at_index'");
    expect(v14Start).toBeGreaterThan(-1);
    const v14Block = src.slice(v14Start, v14Start + 3000);
    expect(v14Block).toContain('pg_index');
    expect(v14Block).toContain('indisvalid');
    expect(v14Block).toContain('DROP INDEX CONCURRENTLY IF EXISTS idx_pages_updated_at_desc');
    expect(v14Block).toContain('CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_pages_updated_at_desc');
    // Order within the handler body: DROP IF EXISTS must precede CREATE IF NOT EXISTS,
    // so a failed prior CONCURRENTLY build is cleaned before re-create. Anchor on the
    // explicit "IF EXISTS" / "IF NOT EXISTS" phrases so the header doc-comment
    // (which mentions both unqualified) doesn't fool the ordering assertion.
    const dropIdx = v14Block.indexOf('DROP INDEX CONCURRENTLY IF EXISTS');
    const createIdx = v14Block.indexOf('CREATE INDEX CONCURRENTLY IF NOT EXISTS');
    expect(dropIdx).toBeLessThan(createIdx);
    expect(v14Block).toContain('engine.kind');
  });
});

describe('migrate v15 — minion_jobs_max_stalled_default_5', () => {
  const v15 = MIGRATIONS.find(m => m.version === 15);
  test('v15 exists and alters max_stalled default to 5', () => {
    expect(v15).toBeDefined();
    expect(v15!.name).toBe('minion_jobs_max_stalled_default_5');
    expect(v15!.sql).toContain('ALTER TABLE minion_jobs ALTER COLUMN max_stalled SET DEFAULT 5');
  });

  test('v15 backfill UPDATE targets the correct non-terminal statuses', () => {
    const sql = v15!.sql;
    expect(sql).toContain(`'waiting'`);
    expect(sql).toContain(`'active'`);
    expect(sql).toContain(`'delayed'`);
    expect(sql).toContain(`'waiting-children'`);
    expect(sql).toContain(`'paused'`);
    expect(sql).not.toContain(`'completed'`);
    expect(sql).not.toContain(`'dead'`);
    expect(sql).not.toContain(`'cancelled'`);
    expect(sql).not.toContain(`'claimed'`);
    expect(sql).not.toContain(`'running'`);
    expect(sql).not.toContain(`'stalled'`);
  });

  test('v15 UPDATE clause has the < 5 guard so idempotent re-runs are no-ops', () => {
    expect(v15!.sql).toContain('max_stalled < 5');
  });
});

describe('migrate — runner behavioral (v14 handler + v15 backfill)', () => {
  let engine: PGLiteEngine;

  beforeAll(async () => {
    engine = new PGLiteEngine();
    await engine.connect({});
    await engine.initSchema();
  });

  afterAll(async () => {
    await engine.disconnect();
  });

  test('v14 created idx_pages_updated_at_desc on PGLite via handler branch', async () => {
    const rows = await (engine as any).db.query(
      `SELECT indexname FROM pg_indexes WHERE indexname = 'idx_pages_updated_at_desc'`
    );
    expect(rows.rows.length).toBe(1);
  });

  test('v15 backfilled any max_stalled=1 rows (smoke: schema default is 5)', async () => {
    await (engine as any).db.exec(
      `INSERT INTO minion_jobs (name, queue, status, max_stalled) VALUES ('test', 'default', 'waiting', 1)`
    );
    await (engine as any).db.exec(
      `UPDATE minion_jobs SET max_stalled = 5
         WHERE status IN ('waiting','active','delayed','waiting-children','paused')
           AND max_stalled < 5`
    );
    const rows = await (engine as any).db.query(
      `SELECT max_stalled FROM minion_jobs WHERE name = 'test'`
    );
    expect((rows.rows[0] as any).max_stalled).toBe(5);

    await (engine as any).db.exec(
      `UPDATE minion_jobs SET max_stalled = 5
         WHERE status IN ('waiting','active','delayed','waiting-children','paused')
           AND max_stalled < 5`
    );
    const rows2 = await (engine as any).db.query(
      `SELECT max_stalled FROM minion_jobs WHERE name = 'test'`
    );
    expect((rows2.rows[0] as any).max_stalled).toBe(5);
  });
});

describe('migrate: v8 (links_dedup) regression — must be fast on 1K duplicate rows', () => {
  let engine: PGLiteEngine;

  beforeAll(async () => {
    engine = new PGLiteEngine();
    await engine.connect({});
    await engine.initSchema();
  });

  afterAll(async () => {
    await engine.disconnect();
  });

  test('1000 duplicate links dedup completes in <90s and leaves table deduped', async () => {
    // Set up: drop BOTH the old (v8) and new (v11) unique constraints so
    // duplicates can be inserted, then reset version so v8 + v11 re-run.
    // v11 replaces the v8 constraint name; we drop whichever is present.
    const db = (engine as any).db;
    await db.exec(`ALTER TABLE links DROP CONSTRAINT IF EXISTS links_from_to_type_unique`);
    await db.exec(`ALTER TABLE links DROP CONSTRAINT IF EXISTS links_from_to_type_source_origin_unique`);

    // Two pages so the FK is satisfied
    await engine.putPage('p/from', { type: 'concept', title: 'F', compiled_truth: '', timeline: '' });
    await engine.putPage('p/to', { type: 'concept', title: 'T', compiled_truth: '', timeline: '' });
    const fromId = (await db.query(`SELECT id FROM pages WHERE slug = 'p/from'`)).rows[0].id;
    const toId = (await db.query(`SELECT id FROM pages WHERE slug = 'p/to'`)).rows[0].id;

    // Insert 1000 duplicates of the same (from, to, type) row
    for (let i = 0; i < 1000; i++) {
      await db.query(
        `INSERT INTO links (from_page_id, to_page_id, link_type, context) VALUES ($1, $2, $3, $4)`,
        [fromId, toId, 'mention', `dup-${i}`]
      );
    }
    const beforeCount = (await db.query(`SELECT COUNT(*)::int AS c FROM links`)).rows[0].c;
    expect(beforeCount).toBe(1000);

    // Reset version to 7 so v8 + v9 + v10 + v11 re-run
    await engine.setConfig('version', '7');

    // Run migrations and assert wall-clock + correctness.
    //
    // Budget note: 90s, not 5s. The 5s budget guarded the original O(n²) v8
    // regression in isolation when the chain only had ~8 migrations to run.
    // Cathedral II (v0.21.0) added v27 + v28 (TSVECTOR column + GIN index +
    // plpgsql trigger compile + 2 new tables w/ FK CASCADE), pushing the
    // full v7→v28 chain to ~30-40s on PGLite WASM. The O(n²) regression
    // would still take MINUTES on 1K duplicate rows (the original incident
    // was multi-minute), so 90s preserves the gate intent while
    // accommodating the longer schema chain.
    const start = Date.now();
    await runMigrations(engine);
    const elapsedMs = Date.now() - start;

    expect(elapsedMs).toBeLessThan(90_000);

    const afterCount = (await db.query(`SELECT COUNT(*)::int AS c FROM links`)).rows[0].c;
    expect(afterCount).toBe(1); // deduped to one row

    // v11 replaces v8's constraint name. Assert the current (v11) constraint
    // exists and the legacy v8 name is gone.
    const constraints = (await db.query(`
      SELECT conname FROM pg_constraint
      WHERE conrelid = 'links'::regclass AND contype = 'u'
    `)).rows;
    expect(constraints.some((c: { conname: string }) => c.conname === 'links_from_to_type_source_origin_unique')).toBe(true);
    expect(constraints.some((c: { conname: string }) => c.conname === 'links_from_to_type_unique')).toBe(false);

    // Helper index was dropped after dedup
    const helperIdx = (await db.query(`
      SELECT indexname FROM pg_indexes
      WHERE tablename = 'links' AND indexname = 'idx_links_dedup_helper'
    `)).rows;
    expect(helperIdx.length).toBe(0);
  });
});

describe('migrate: v9 (timeline_dedup_index) regression — must be fast on 1K duplicate rows', () => {
  let engine: PGLiteEngine;

  beforeAll(async () => {
    engine = new PGLiteEngine();
    await engine.connect({});
    await engine.initSchema();
  });

  afterAll(async () => {
    await engine.disconnect();
  });

  test('1000 duplicate timeline entries dedup completes in <90s and leaves table deduped', async () => {
    const db = (engine as any).db;
    await db.exec(`DROP INDEX IF EXISTS idx_timeline_dedup`);

    await engine.putPage('p/timeline', { type: 'concept', title: 'TL', compiled_truth: '', timeline: '' });
    const pageId = (await db.query(`SELECT id FROM pages WHERE slug = 'p/timeline'`)).rows[0].id;

    // Insert 1000 duplicates of the same (page_id, date, summary) row
    for (let i = 0; i < 1000; i++) {
      await db.query(
        `INSERT INTO timeline_entries (page_id, date, source, summary, detail) VALUES ($1, $2::date, $3, $4, $5)`,
        [pageId, '2024-01-15', `src-${i}`, 'Founded NovaMind', `detail-${i}`]
      );
    }
    const beforeCount = (await db.query(`SELECT COUNT(*)::int AS c FROM timeline_entries`)).rows[0].c;
    expect(beforeCount).toBe(1000);

    await engine.setConfig('version', '7');

    // Same 90s budget as the v8 link-dedup test for the same reason — see
    // its "Budget note" comment. The 5s budget was for v9 in isolation;
    // post-Cathedral II the chain runs through v28's TSVECTOR + GIN setup.
    const start = Date.now();
    await runMigrations(engine);
    const elapsedMs = Date.now() - start;

    expect(elapsedMs).toBeLessThan(90_000);

    const afterCount = (await db.query(`SELECT COUNT(*)::int AS c FROM timeline_entries`)).rows[0].c;
    expect(afterCount).toBe(1);

    const uniqueIdx = (await db.query(`
      SELECT indexname FROM pg_indexes
      WHERE tablename = 'timeline_entries' AND indexname = 'idx_timeline_dedup'
    `)).rows;
    expect(uniqueIdx.length).toBe(1);

    const helperIdx = (await db.query(`
      SELECT indexname FROM pg_indexes
      WHERE tablename = 'timeline_entries' AND indexname = 'idx_timeline_dedup_helper'
    `)).rows;
    expect(helperIdx.length).toBe(0);
  });
});

// ─────────────────────────────────────────────────────────────────
// resolvePoolSize — GBRAIN_POOL_SIZE env override
// ─────────────────────────────────────────────────────────────────
//
// Guards the Bug 2 fix: users on constrained poolers (Supabase port 6543)
// must be able to cap the pool size via GBRAIN_POOL_SIZE. The default
// (10) is unchanged when the env var is unset.

describe('resolvePoolSize — env var + explicit override', () => {
  const { resolvePoolSize } = require('../src/core/db.ts');
  const original = process.env.GBRAIN_POOL_SIZE;

  afterAll(() => {
    if (original === undefined) delete process.env.GBRAIN_POOL_SIZE;
    else process.env.GBRAIN_POOL_SIZE = original;
  });

  test('returns 10 default when unset and no explicit override', () => {
    delete process.env.GBRAIN_POOL_SIZE;
    expect(resolvePoolSize()).toBe(10);
  });

  test('reads GBRAIN_POOL_SIZE as an integer', () => {
    process.env.GBRAIN_POOL_SIZE = '2';
    expect(resolvePoolSize()).toBe(2);
    process.env.GBRAIN_POOL_SIZE = '5';
    expect(resolvePoolSize()).toBe(5);
  });

  test('ignores invalid GBRAIN_POOL_SIZE values', () => {
    process.env.GBRAIN_POOL_SIZE = 'not-a-number';
    expect(resolvePoolSize()).toBe(10);
    process.env.GBRAIN_POOL_SIZE = '0';
    expect(resolvePoolSize()).toBe(10);
    process.env.GBRAIN_POOL_SIZE = '-1';
    expect(resolvePoolSize()).toBe(10);
  });

  test('explicit argument wins over env + default', () => {
    delete process.env.GBRAIN_POOL_SIZE;
    expect(resolvePoolSize(3)).toBe(3);
    process.env.GBRAIN_POOL_SIZE = '7';
    expect(resolvePoolSize(3)).toBe(3);
  });
});

// ─────────────────────────────────────────────────────────────────
// PR #356 regression guards — migration hardening
// ─────────────────────────────────────────────────────────────────
//
// These tests guard the codex + eng review findings folded into PR #356.
// If anyone refactors away the fixes, these catch it.

describe('PR #356 — LATEST_VERSION is max(versions), not array[-1]', () => {
  test('LATEST_VERSION equals Math.max of all migration versions', () => {
    // The bug it closes: MIGRATIONS is NOT stored in ascending order.
    // array[-1] returned v16 when the true max was v23 — every Postgres
    // user was told "up to date at v16" while 7 migrations were behind.
    // This regression guard catches any refactor back to array[-1].
    const expectedMax = Math.max(...MIGRATIONS.map(m => m.version));
    expect(LATEST_VERSION).toBe(expectedMax);
  });

  test('Math.max is robust to any array order (structural check)', () => {
    // The array ordering is not a guarantee we maintain. v0.18.0's v21/v22/v23
    // sat out-of-order in the middle of the array (release-order reasons);
    // v0.18.1's v24 was appended sensibly. Both need to work. The invariant
    // is: LATEST_VERSION equals max across any ordering. Scramble and verify.
    const scrambled = [...MIGRATIONS].sort(() => Math.random() - 0.5);
    const scrambledMax = Math.max(...scrambled.map(m => m.version));
    expect(scrambledMax).toBe(LATEST_VERSION);

    // Guard against regression to array[-1]: the production source must use
    // Math.max, never indexed access to the last element.
    const src = readFileSync(resolve('src/core/migrate.ts'), 'utf-8');
    expect(src).toMatch(/LATEST_VERSION\s*=\s*MIGRATIONS\.length[\s\S]{0,200}Math\.max/);
    expect(src).not.toMatch(/MIGRATIONS\[MIGRATIONS\.length\s*-\s*1\]\.version/);
  });
});

describe('PR #356 — getIdleBlockers pg_stat_activity shape', () => {
  // Minimal mock of BrainEngine — we only need kind + executeRaw.
  function mockEngine(kind: 'postgres' | 'pglite', rows: IdleBlocker[] | Error): BrainEngine {
    return {
      kind,
      async executeRaw<T>(_sql: string, _params?: unknown[]): Promise<T[]> {
        if (rows instanceof Error) throw rows;
        return rows as unknown as T[];
      },
    } as unknown as BrainEngine;
  }

  test('returns [] on PGLite (no pool, no idle-in-tx concept)', async () => {
    const engine = mockEngine('pglite', [{ pid: 1, state: 'idle in transaction', query_start: 'x', query: 'y' }]);
    const blockers = await getIdleBlockers(engine);
    expect(blockers).toEqual([]);
  });

  test('returns rows from pg_stat_activity on Postgres', async () => {
    const fixture: IdleBlocker[] = [
      { pid: 12345, state: 'idle in transaction', query_start: '2026-04-22 06:00:00+00', query: 'BEGIN; SELECT * FROM pages' },
    ];
    const engine = mockEngine('postgres', fixture);
    const blockers = await getIdleBlockers(engine);
    expect(blockers).toEqual(fixture);
  });

  test('returns [] (not throw) when pg_stat_activity query fails', async () => {
    // Some managed Postgres tenants restrict pg_stat_activity. The helper
    // should degrade gracefully: doctor --locks prints "no blockers" and
    // migration pre-flight skips the warning.
    const engine = mockEngine('postgres', new Error('permission denied'));
    const blockers = await getIdleBlockers(engine);
    expect(blockers).toEqual([]);
  });
});

describe('PR #356 — 57014 catch path emits actionable 4-part diagnostic', () => {
  test('runMigrations surfaces SQLSTATE 57014 with fix + verify steps', async () => {
    // Mock an engine whose runMigration throws a code-57014 error
    // once; the catch branch should log the 4-part structure AND
    // rethrow preserving err.code so callers can re-branch.
    //
    // v0.30.1: retry wrapper now retries 3x on 57014. We set
    // GBRAIN_MIGRATE_BACKOFF_MS=0 in test env to skip the 5s/15s wait
    // so the test still completes within its budget. The final throw
    // is a MigrationRetryExhausted whose message names the (mocked,
    // empty) blocker set; the legacy err.code preservation is no longer
    // primary surface — callers handle MigrationRetryExhausted explicitly.
    const original = process.env.GBRAIN_MIGRATE_BACKOFF_MS;
    process.env.GBRAIN_MIGRATE_BACKOFF_MS = '0';

    const err = Object.assign(new Error('canceling statement due to statement timeout'), { code: '57014' });

    let caughtCode: string | undefined;
    let caughtName: string | undefined;
    // getConfig returns '15' so pending starts with v16 (has sql content
    // in the MIGRATIONS array). The first migration's SQL execution
    // hits the 57014-throwing mock and fires the diagnostic branch.
    const engine = {
      kind: 'postgres' as const,
      async getConfig(_k: string) { return '15'; },
      async setConfig() {},
      async executeRaw() { return []; },
      async transaction<T>(fn: (e: BrainEngine) => Promise<T>): Promise<T> { return fn(engine as unknown as BrainEngine); },
      async withReservedConnection() { throw new Error('unreached'); },
      async runMigration() { throw err; },
    } as unknown as BrainEngine;

    const errSpy = spyOn(console, 'error').mockImplementation(() => {});

    try {
      await runMigrations(engine);
    } catch (e: unknown) {
      caughtCode = (e as { code?: string }).code;
      caughtName = (e as { name?: string }).name;
    }
    if (original === undefined) delete process.env.GBRAIN_MIGRATE_BACKOFF_MS;
    else process.env.GBRAIN_MIGRATE_BACKOFF_MS = original;
    // v0.30.1: the throw is now a MigrationRetryExhausted (retry wrapper
    // wraps the original err after 3 attempts). The original 57014 code
    // is preserved on the `lastError` member of the envelope.
    expect(caughtName).toBe('MigrationRetryExhausted');
    // Defensive: legacy callers checking .code still work via `lastError`.
    void caughtCode;

    // Assert the diagnostic lines hit stderr with the agent-driven shape.
    // v0.30.1: the header reads "exhausted retries" instead of
    // "hit statement_timeout (SQLSTATE 57014)" because the retry wrapper
    // wrapped the underlying timeout. The Cause/Fix/Verify body still fires
    // when no blockers were detected (empty pg_stat_activity in the mock).
    const msgs = errSpy.mock.calls.map(c => String(c[0]));
    const joined = msgs.join('\n');
    expect(joined).toContain('exhausted retries');
    expect(joined).toContain('gbrain doctor --locks');
    expect(joined).toContain('gbrain apply-migrations --yes');
    expect(joined).toContain('Verify:');
    expect(joined).toContain('gbrain doctor');

    errSpy.mockRestore();
  });
});

describe('PR #356 — apply-migrations pre-flight schema-version warning', () => {
  test('source contains the pre-flight check branch before plan execution', () => {
    // Structural check: the pre-flight block compares the engine's
    // reported schema version against LATEST_VERSION and warns if
    // behind. If someone removes this branch, users who run
    // apply-migrations expecting it to handle schema migrations get
    // the silent-gaslight experience from the field report.
    const source = readFileSync(resolve('src/commands/apply-migrations.ts'), 'utf-8');
    expect(source).toContain('LATEST_VERSION');
    expect(source).toContain('Schema version');
    expect(source).toContain('is behind latest');
  });
});

describe('PR #356 + #363 — session timeouts applied via startup parameters', () => {
  test('structural: setSessionDefaults exists for back-compat; resolveSessionTimeouts is the source of truth', () => {
    // PR #356 introduced setSessionDefaults (post-pool SET).
    // PR #363 superseded it with resolveSessionTimeouts (startup parameters,
    // PgBouncer-transaction-mode-safe). The setSessionDefaults function is
    // kept as a no-op shim for back-compat with existing call sites.
    const dbSrc = readFileSync(resolve('src/core/db.ts'), 'utf-8');
    const pgSrc = readFileSync(resolve('src/core/postgres-engine.ts'), 'utf-8');

    // Helper still exists for back-compat
    expect(dbSrc).toContain('export async function setSessionDefaults');
    // The new source-of-truth function exists
    expect(dbSrc).toContain('export function resolveSessionTimeouts');
    expect(dbSrc).toContain('idle_in_transaction_session_timeout');

    // Both connect paths call resolveSessionTimeouts() and feed it through
    // postgres.js's connection option (startup parameters)
    expect(dbSrc).toContain('resolveSessionTimeouts()');
    expect(pgSrc).toContain('resolveSessionTimeouts()');

    // setSessionDefaults still callable (no-op) so existing call sites
    // don't break, but the SET command itself is gone — the work has
    // already happened at connection startup time.
    expect(pgSrc).toContain('db.setSessionDefaults');

    // Critically: no SET idle_in_transaction in source — startup parameters
    // are the durable mechanism for PgBouncer transaction mode.
    const setMatches = dbSrc.match(/SET idle_in_transaction_session_timeout/g) || [];
    expect(setMatches.length).toBe(0);
  });
});

describe('PR #356 — non-transactional DDL runs via reserved connection', () => {
  test('runMigrationSQL uses withReservedConnection for transaction:false branch', () => {
    // The else-branch of runMigrationSQL (CREATE INDEX CONCURRENTLY etc.)
    // must go through engine.withReservedConnection + SET statement_timeout,
    // NOT engine.runMigration on the shared pool. Codex caught that the
    // prior code left CONCURRENTLY DDL exposed to Supabase's 2-min timeout
    // with no session-level override.
    //
    // v0.30.1: anchor on the exact function signature (open paren) so we
    // don't match the new `runMigrationSQLWithRetry` wrapper that lives
    // immediately above. The wrapper calls runMigrationSQL inside its retry
    // body, so it must come BEFORE in the source — which is why a prefix
    // match would catch the wrong function.
    const source = readFileSync(resolve('src/core/migrate.ts'), 'utf-8');

    const runFnIdx = source.indexOf('async function runMigrationSQL(');
    expect(runFnIdx).toBeGreaterThan(-1);
    const fnBody = source.slice(runFnIdx, runFnIdx + 2500);
    expect(fnBody).toContain('withReservedConnection');
    expect(fnBody).toContain("SET statement_timeout = '600000'");
  });
});

describe('migration v31 — eval_capture_tables', () => {
  test('exists with the expected name and is engine-specific (sqlFor)', () => {
    const v31 = MIGRATIONS.find(m => m.version === 31);
    expect(v31).toBeDefined();
    expect(v31?.name).toBe('eval_capture_tables');
    expect(v31?.sqlFor?.postgres).toBeDefined();
    expect(v31?.sqlFor?.pglite).toBeDefined();
    expect(v31?.sql).toBe('');
  });

  test('creates both eval_candidates and eval_capture_failures on both engines', () => {
    const v31 = MIGRATIONS.find(m => m.version === 31)!;
    for (const variant of ['postgres', 'pglite'] as const) {
      const sql = v31.sqlFor![variant]!;
      expect(sql).toContain('CREATE TABLE IF NOT EXISTS eval_candidates');
      expect(sql).toContain('CREATE TABLE IF NOT EXISTS eval_capture_failures');
    }
  });

  test('enforces CHECK length(query) <= 51200', () => {
    const v31 = MIGRATIONS.find(m => m.version === 31)!;
    for (const variant of ['postgres', 'pglite'] as const) {
      expect(v31.sqlFor![variant]!).toContain('CHECK (length(query) <= 51200)');
    }
  });

  test('enforces tool_name enum + reason enum', () => {
    const v31 = MIGRATIONS.find(m => m.version === 31)!;
    for (const variant of ['postgres', 'pglite'] as const) {
      const sql = v31.sqlFor![variant]!;
      expect(sql).toContain(`tool_name IN ('query', 'search')`);
      expect(sql).toContain(`reason IN ('db_down', 'rls_reject', 'check_violation', 'scrubber_exception', 'other')`);
    }
  });

  test('creates DESC indexes on both tables', () => {
    const v31 = MIGRATIONS.find(m => m.version === 31)!;
    for (const variant of ['postgres', 'pglite'] as const) {
      const sql = v31.sqlFor![variant]!;
      expect(sql).toContain('idx_eval_candidates_created_at');
      expect(sql).toContain('idx_eval_capture_failures_ts');
      expect(sql).toContain('created_at DESC');
      expect(sql).toContain('ts DESC');
    }
  });

  test('Postgres variant gates RLS on BYPASSRLS and fails loudly', () => {
    const pgSql = MIGRATIONS.find(m => m.version === 31)!.sqlFor!.postgres!;
    expect(pgSql).toContain('rolbypassrls');
    expect(pgSql).toMatch(/IF NOT has_bypass/);
    expect(pgSql).toMatch(/RAISE EXCEPTION[^;]*BYPASSRLS/);
    expect(pgSql).toContain('ALTER TABLE eval_candidates ENABLE ROW LEVEL SECURITY');
    expect(pgSql).toContain('ALTER TABLE eval_capture_failures ENABLE ROW LEVEL SECURITY');
  });

  test('PGLite variant has no RLS / no BYPASSRLS gate', () => {
    const pgliteSql = MIGRATIONS.find(m => m.version === 31)!.sqlFor!.pglite!;
    expect(pgliteSql).not.toContain('rolbypassrls');
    expect(pgliteSql).not.toContain('ENABLE ROW LEVEL SECURITY');
  });

  test('LATEST_VERSION caught up to 31', () => {
    expect(LATEST_VERSION).toBeGreaterThanOrEqual(31);
  });
});

describe('migration v40 — pages_emotional_weight (v0.29)', () => {
  // v0.29 ships off master. Master is at v39 (multimodal_dual_column_v0_27_1);
  // v0.29 lands at v40. Idempotent ADD COLUMN IF NOT EXISTS, so brains that
  // applied this at any prior number on a feature branch see v40 as new and
  // run cleanly.
  test('exists with the expected name', () => {
    const v40 = MIGRATIONS.find(m => m.version === 40);
    expect(v40).toBeDefined();
    expect(v40?.name).toBe('pages_emotional_weight');
  });

  test('adds emotional_weight REAL NOT NULL DEFAULT 0.0 to pages', () => {
    const v40 = MIGRATIONS.find(m => m.version === 40);
    const sql = v40!.sql || '';
    expect(sql).toContain('ALTER TABLE pages');
    expect(sql).toContain('ADD COLUMN IF NOT EXISTS emotional_weight');
    expect(sql).toContain('REAL');
    expect(sql).toContain('NOT NULL DEFAULT 0.0');
  });

  test('does NOT create an idx_pages_emotional_weight index (eng review D6)', () => {
    // Salience query orders by computed score, not raw weight; the index
    // would never be used. Adding it later requires a separate migration.
    const v40 = MIGRATIONS.find(m => m.version === 40);
    const sql = v40!.sql || '';
    expect(sql).not.toContain('idx_pages_emotional_weight');
    expect(sql).not.toContain('CREATE INDEX');
  });

  test('LATEST_VERSION caught up to 40', () => {
    expect(LATEST_VERSION).toBeGreaterThanOrEqual(40);
  });
});

describe('migration v48 — takes_weight_round_to_grid (v0.32)', () => {
  // v0.32 — Takes v2 wave. Renumbered from v46 → v48 after merging master's
  // v0.31.3 wave (which claimed v46 with mcp_request_log_params_jsonb_normalize).
  // Backfill the pre-v0.32 weight column to the 0.05 grid the engine layer
  // (PR #795) enforces on insert. Cross-modal eval over 100K production
  // takes flagged 0.74, 0.82-style values as false precision; this migration
  // brings existing data to the grid that all new writes already match.
  test('exists with the expected name', () => {
    const v48 = MIGRATIONS.find(m => m.version === 48);
    expect(v48).toBeDefined();
    expect(v48?.name).toBe('takes_weight_round_to_grid');
  });

  test('uses transaction:false (codex review #2 — non-blocking, idempotent via WHERE)', () => {
    // The original plan called this "mid-statement resume" — that was wrong.
    // What transaction:false actually buys is freeing the migration runner
    // from a long transaction so other gbrain processes can interleave.
    const v48 = MIGRATIONS.find(m => m.version === 48);
    expect(v48?.transaction).toBe(false);
  });

  test('UPDATE rounds weight to 0.05 grid', () => {
    const v48 = MIGRATIONS.find(m => m.version === 48);
    const sql = v48!.sql || '';
    expect(sql).toContain('UPDATE takes');
    expect(sql).toContain('ROUND(weight::numeric * 20) / 20');
  });

  test('WHERE uses tolerance comparison (REAL float32 noise vs 0.05 grid)', () => {
    // Codex #2 idempotency correction + REAL/float32 implementation note:
    // a naive `weight <> ROUND(...)` form fires every time because mixed
    // REAL/NUMERIC comparison promotes weight to DOUBLE PRECISION first,
    // surfacing ~1e-7 representation noise as inequality. The tolerance
    // form (abs(...) > 0.001) catches genuinely off-grid values (the 0.05
    // grid is 5e-2, far above 1e-3) while ignoring float32 round-trip noise.
    const v48 = MIGRATIONS.find(m => m.version === 48);
    const sql = v48!.sql || '';
    expect(sql).toContain('WHERE');
    expect(sql).toContain('abs(weight::numeric');
    expect(sql).toContain('> 0.001');
  });

  test('IS NOT NULL guard (insurance against stale schema)', () => {
    const v48 = MIGRATIONS.find(m => m.version === 48);
    const sql = v48!.sql || '';
    expect(sql).toContain('weight IS NOT NULL');
  });

  test('LATEST_VERSION caught up to 48', () => {
    expect(LATEST_VERSION).toBeGreaterThanOrEqual(48);
  });
});

describe('migration v49 — eval_takes_quality_runs (v0.32)', () => {
  // v0.32 EXP-5 — Renumbered from v47 → v49 after merging master's v0.31.3 wave.
  // DB-authoritative receipts table for `gbrain eval takes-quality`.
  // Codex review #6 corrected the original two-phase split-brain plan: DB row
  // is the source of truth (carries full receipt JSON), disk artifact is
  // best-effort. The 4-sha unique key (corpus, prompt, models, rubric) makes
  // re-running identical evals an `INSERT ... ON CONFLICT DO NOTHING` no-op.
  test('exists with the expected name', () => {
    const v49 = MIGRATIONS.find(m => m.version === 49);
    expect(v49).toBeDefined();
    expect(v49?.name).toBe('eval_takes_quality_runs');
  });

  test('creates the table with all 4 receipt sha columns + receipt_json JSONB', () => {
    const v49 = MIGRATIONS.find(m => m.version === 49);
    const sql = v49!.sql || '';
    expect(sql).toContain('CREATE TABLE IF NOT EXISTS eval_takes_quality_runs');
    expect(sql).toContain('receipt_sha8_corpus');
    expect(sql).toContain('receipt_sha8_prompt');
    expect(sql).toContain('receipt_sha8_models');
    expect(sql).toContain('receipt_sha8_rubric');
    expect(sql).toContain('receipt_json          JSONB');
  });

  test('has 4-sha UNIQUE constraint (idempotent re-runs)', () => {
    const v49 = MIGRATIONS.find(m => m.version === 49);
    const sql = v49!.sql || '';
    expect(sql).toContain('UNIQUE (receipt_sha8_corpus, receipt_sha8_prompt, receipt_sha8_models, receipt_sha8_rubric)');
  });

  test('verdict column has CHECK constraint for the 3 verdict values', () => {
    const v49 = MIGRATIONS.find(m => m.version === 49);
    const sql = v49!.sql || '';
    expect(sql).toContain("CHECK (verdict IN ('pass','fail','inconclusive'))");
  });

  test('trend index orders by (rubric_version, created_at DESC)', () => {
    // Codex review #3 — trend mode segregates by rubric_version + reads
    // ordered DESC. Index shape must match the query shape exactly.
    const v49 = MIGRATIONS.find(m => m.version === 49);
    const sql = v49!.sql || '';
    expect(sql).toContain('eval_takes_quality_runs_trend_idx');
    expect(sql).toContain('(rubric_version, created_at DESC)');
  });

  test('LATEST_VERSION caught up to 49', () => {
    expect(LATEST_VERSION).toBeGreaterThanOrEqual(49);
  });
});

describe('migration v51 — facts_fence_columns (v0.32.2)', () => {
  // v0.32.2: facts become FS-canonical via the `## Facts` fence pattern
  // (mirror of takes-fence). row_num + source_markdown_slug are the
  // fence round-trip columns; the partial UNIQUE index enforces uniqueness
  // only once row_num is assigned, leaving legacy NULL rows uncollided
  // until the v0_32_2 orchestrator backfills them from entity-page fences.
  test('exists with the expected name', () => {
    const v51 = MIGRATIONS.find(m => m.version === 51);
    expect(v51).toBeDefined();
    expect(v51?.name).toBe('facts_fence_columns');
  });

  test('adds row_num + source_markdown_slug as ADD COLUMN IF NOT EXISTS', () => {
    const v51 = MIGRATIONS.find(m => m.version === 51);
    const sql = v51!.sql || '';
    expect(sql).toContain('ALTER TABLE facts ADD COLUMN IF NOT EXISTS row_num');
    expect(sql).toContain('ALTER TABLE facts ADD COLUMN IF NOT EXISTS source_markdown_slug');
  });

  test('row_num must be nullable (legacy v0.31 rows have no row_num until backfill)', () => {
    const v51 = MIGRATIONS.find(m => m.version === 51);
    const sql = v51!.sql || '';
    // Both ALTERs land without `NOT NULL` — the orchestrator backfills before
    // anything assumes presence. A future migration may tighten this once the
    // backfill has run everywhere.
    expect(sql).not.toMatch(/row_num\s+INTEGER\s+NOT NULL/);
    expect(sql).not.toMatch(/source_markdown_slug\s+TEXT\s+NOT NULL/);
  });

  test('creates partial unique index keyed on (source_id, source_markdown_slug, row_num) WHERE row_num IS NOT NULL', () => {
    const v51 = MIGRATIONS.find(m => m.version === 51);
    const sql = v51!.sql || '';
    expect(sql).toContain('CREATE UNIQUE INDEX IF NOT EXISTS idx_facts_fence_key');
    expect(sql).toContain('ON facts (source_id, source_markdown_slug, row_num)');
    expect(sql).toContain('WHERE row_num IS NOT NULL');
  });

  test('partial WHERE clause is the Codex R2 collision guard for legacy NULL rows', () => {
    // Without the partial clause, two pre-v51 rows with NULL row_num on the
    // same (source_id, source_markdown_slug) coordinate would collide and
    // the migration would fail loudly on any populated v0.31 brain. The
    // partial index makes legacy rows invisible to uniqueness checks until
    // the v0_32_2 orchestrator gives them a row_num.
    const v51 = MIGRATIONS.find(m => m.version === 51);
    const sql = v51!.sql || '';
    const indexClause = sql.match(/CREATE UNIQUE INDEX[\s\S]*?;/);
    expect(indexClause).toBeTruthy();
    expect(indexClause![0]).toContain('WHERE row_num IS NOT NULL');
  });

  test('LATEST_VERSION caught up to 51', () => {
    expect(LATEST_VERSION).toBeGreaterThanOrEqual(51);
  });
});

// ─────────────────────────────────────────────────────────────────
// PR #363 regression guards — session timeouts via startup parameters
// resolveSessionTimeouts — GBRAIN_*_TIMEOUT env overrides
// ─────────────────────────────────────────────────────────────────
//
// Guards: orphan pgbouncer backends that hold table locks for hours when
// the postgres.js client disconnects mid-transaction. Session-level
// statement_timeout + idle_in_transaction_session_timeout delivered as
// startup parameters kill those backends on the server side.

describe('resolveSessionTimeouts — env var overrides', () => {
  const { resolveSessionTimeouts } = require('../src/core/db.ts');
  const origStatement = process.env.GBRAIN_STATEMENT_TIMEOUT;
  const origIdleTx = process.env.GBRAIN_IDLE_TX_TIMEOUT;
  const origCheck = process.env.GBRAIN_CLIENT_CHECK_INTERVAL;

  afterAll(() => {
    const restore = (key: string, val: string | undefined) => {
      if (val === undefined) delete process.env[key];
      else process.env[key] = val;
    };
    restore('GBRAIN_STATEMENT_TIMEOUT', origStatement);
    restore('GBRAIN_IDLE_TX_TIMEOUT', origIdleTx);
    restore('GBRAIN_CLIENT_CHECK_INTERVAL', origCheck);
  });

  const resetEnv = () => {
    delete process.env.GBRAIN_STATEMENT_TIMEOUT;
    delete process.env.GBRAIN_IDLE_TX_TIMEOUT;
    delete process.env.GBRAIN_CLIENT_CHECK_INTERVAL;
  };

  test('returns statement_timeout + idle_in_transaction defaults when unset', () => {
    resetEnv();
    const t = resolveSessionTimeouts();
    expect(t.statement_timeout).toBe('5min');
    // Default bumped from #363's original 2min to 5min on merge with v0.21.0's
    // setSessionDefaults posture, to avoid regressing long embed/CREATE INDEX
    // passes that have legitimate idle gaps.
    expect(t.idle_in_transaction_session_timeout).toBe('5min');
    // client_connection_check_interval is opt-in only (Postgres 14+)
    expect(t.client_connection_check_interval).toBeUndefined();
  });

  test('env vars override the defaults', () => {
    resetEnv();
    process.env.GBRAIN_STATEMENT_TIMEOUT = '10min';
    process.env.GBRAIN_IDLE_TX_TIMEOUT = '30s';
    process.env.GBRAIN_CLIENT_CHECK_INTERVAL = '15s';
    const t = resolveSessionTimeouts();
    expect(t.statement_timeout).toBe('10min');
    expect(t.idle_in_transaction_session_timeout).toBe('30s');
    expect(t.client_connection_check_interval).toBe('15s');
  });

  test("'0' disables a specific GUC", () => {
    resetEnv();
    process.env.GBRAIN_STATEMENT_TIMEOUT = '0';
    const t = resolveSessionTimeouts();
    expect(t.statement_timeout).toBeUndefined();
    expect(t.idle_in_transaction_session_timeout).toBe('5min');
  });

  test("'off' disables a specific GUC", () => {
    resetEnv();
    process.env.GBRAIN_IDLE_TX_TIMEOUT = 'off';
    const t = resolveSessionTimeouts();
    expect(t.statement_timeout).toBe('5min');
    expect(t.idle_in_transaction_session_timeout).toBeUndefined();
  });

  test('all three can be disabled independently', () => {
    resetEnv();
    process.env.GBRAIN_STATEMENT_TIMEOUT = '0';
    process.env.GBRAIN_IDLE_TX_TIMEOUT = 'off';
    const t = resolveSessionTimeouts();
    expect(Object.keys(t)).toHaveLength(0);
  });
});