/**
 * Unit tests for the DI-native CollabService — COLLAB-SVC-001 to COLLAB-SVC-038
 * (001–030 moved 1:1 from the legacy tests/unit/services/collabService.test.ts;
 * 031–033 (collab.bridge delegation) died with the bridge; 034–038 pin the post-migration
 * hardening: transactional writes, trip-scoped getFormattedNoteById, the
 * integer vote guard and malformed-URL absorption). Covers votePoll edge
 * cases, listMessages pagination, deleteMessage ownership, updateNote partial
 * fields, linkPreview, avatarUrl, createMessage reply validation. Uses a real
 * in-memory SQLite DB so SQL logic is exercised faithfully.
 */
import { describe, it, expect, vi, beforeAll, beforeEach, afterAll, afterEach } from 'vitest';

// ── DB setup ─────────────────────────────────────────────────────────────────

const { testDb, dbMock } = vi.hoisted(() => {
  const Database = require('better-sqlite3');
  const db = new Database(':memory:');
  db.exec('PRAGMA journal_mode = WAL');
  db.exec('PRAGMA foreign_keys = ON');
  db.exec('PRAGMA busy_timeout = 5000');
  const mock = {
    db,
    closeDb: () => {},
    reinitialize: () => {},
    getPlaceWithTags: () => null,
    canAccessTrip: (tripId: any, userId: number) =>
      db.prepare(`
        SELECT t.id FROM trips t
        LEFT JOIN trip_members m ON m.trip_id = t.id AND m.user_id = ?
        WHERE t.id = ? AND (t.user_id = ? OR m.user_id IS NOT NULL)
      `).get(userId, tripId, userId),
    isOwner: (tripId: any, userId: number) =>
      !!db.prepare('SELECT id FROM trips WHERE id = ? AND user_id = ?').get(tripId, userId),
  };
  return { testDb: db, dbMock: mock };
});

vi.mock('../../../src/db/database', () => dbMock);
vi.mock('../../../src/config', () => ({
  JWT_SECRET: 'test-jwt-secret-for-trek-testing-only',
  ENCRYPTION_KEY: 'a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6a7b8c9d0e1f2a3b4c5d6a7b8c9d0e1f2',
  updateJwtSecret: () => {},
}));
vi.mock('../../../src/websocket', () => ({ broadcast: vi.fn() }));

// Stub checkSsrf so linkPreview tests can control SSRF behaviour. Typed from the real
// checkSsrf rather than from the default implementation below, so the stubbed results
// stay full SsrfResult objects instead of whatever shape the first fixture happened to have.
const { mockCheckSsrf, mockCreatePinnedDispatcher } = vi.hoisted(() => ({
  mockCheckSsrf: vi.fn<typeof import('../../../src/utils/ssrfGuard').checkSsrf>(
    async () => ({ allowed: true, isPrivate: false, resolvedIp: '93.184.216.34' }),
  ),
  mockCreatePinnedDispatcher: vi.fn(() => ({})),
}));
vi.mock('../../../src/utils/ssrfGuard', () => ({
  checkSsrf: mockCheckSsrf,
  createPinnedDispatcher: mockCreatePinnedDispatcher,
}));

import { createTables } from '../../../src/db/schema';
import { runMigrations } from '../../../src/db/migrations';
import { resetTestDb } from '../../helpers/test-db';
import { createUser, createTrip } from '../../helpers/factories';
import { avatarUrl } from '../../../src/nest/common/avatarUrl';
import { DatabaseService } from '../../../src/nest/database/database.service';
import { PermissionsService } from '../../../src/nest/permissions/permissions.service';
import { CollabService } from '../../../src/nest/collab/collab.service';
import { RealtimeService } from '../../../src/nest/realtime/realtime.service';
import { notificationsStub } from '../../helpers/notifications';
import { makeStorageFixture } from '../../helpers/storage-fixture';
import { RateLimitService } from '../../../src/nest/common/rate-limit.service';

const collabFx = makeStorageFixture('files/');
const rateLimit = new RateLimitService();
const svc = new CollabService(new DatabaseService(testDb), new PermissionsService(new DatabaseService(testDb)), new RealtimeService(), notificationsStub(), collabFx.storage, rateLimit);

/** A CollabService with its own preview cache and budget, for the tests that fill either. */
const freshSvc = () => new CollabService(new DatabaseService(testDb), new PermissionsService(new DatabaseService(testDb)), new RealtimeService(), notificationsStub(), collabFx.storage, new RateLimitService());

beforeAll(() => {
  createTables(testDb);
  runMigrations(testDb);
});

beforeEach(() => {
  resetTestDb(testDb);
  mockCheckSsrf.mockResolvedValue({ allowed: true, isPrivate: false, resolvedIp: '93.184.216.34' });
});

afterAll(() => {
  testDb.close();
});

afterEach(() => {
  vi.unstubAllGlobals();
  mockCheckSsrf.mockReset();
  mockCheckSsrf.mockResolvedValue({ allowed: true, isPrivate: false, resolvedIp: '93.184.216.34' });
});

// ── Helpers ───────────────────────────────────────────────────────────────────

function setup() {
  const { user: user1 } = createUser(testDb);
  const { user: user2 } = createUser(testDb);
  const trip = createTrip(testDb, user1.id);
  return { user1, user2, trip };
}

// ── avatarUrl ─────────────────────────────────────────────────────────────────

describe('avatarUrl', () => {
  it('COLLAB-SVC-001: returns null when avatar is null', () => {
    expect(avatarUrl({ avatar: null })).toBeNull();
  });

  it('COLLAB-SVC-002: returns upload path when avatar is set', () => {
    expect(avatarUrl({ avatar: 'abc.jpg' })).toBe('/uploads/avatars/abc.jpg');
  });

  it('COLLAB-SVC-003: returns null when avatar is empty string', () => {
    expect(avatarUrl({ avatar: '' })).toBeNull();
  });
});

// ── votePoll ──────────────────────────────────────────────────────────────────

describe('votePoll', () => {
  it('COLLAB-SVC-004: returns error "closed" when poll is closed', () => {
    const { user1, trip } = setup();
    const poll = svc.createPoll(trip.id, user1.id, { question: 'Q?', options: ['A', 'B'] });
    svc.closePoll(trip.id, poll!.id);

    const result = svc.votePoll(trip.id, poll!.id, user1.id, 0);
    expect(result.error).toBe('closed');
  });

  it('COLLAB-SVC-005: returns error "invalid_index" for negative index', () => {
    const { user1, trip } = setup();
    const poll = svc.createPoll(trip.id, user1.id, { question: 'Q?', options: ['A', 'B'] });

    const result = svc.votePoll(trip.id, poll!.id, user1.id, -1);
    expect(result.error).toBe('invalid_index');
  });

  it('COLLAB-SVC-006: returns error "invalid_index" for out-of-range index', () => {
    const { user1, trip } = setup();
    const poll = svc.createPoll(trip.id, user1.id, { question: 'Q?', options: ['A', 'B'] });

    const result = svc.votePoll(trip.id, poll!.id, user1.id, 5);
    expect(result.error).toBe('invalid_index');
  });

  it('COLLAB-SVC-007: returns error "not_found" for nonexistent poll', () => {
    const { user1, trip } = setup();
    const result = svc.votePoll(trip.id, 9999, user1.id, 0);
    expect(result.error).toBe('not_found');
  });

  it('COLLAB-SVC-008: successfully votes and returns poll with voters', () => {
    const { user1, trip } = setup();
    const poll = svc.createPoll(trip.id, user1.id, { question: 'Q?', options: ['Yes', 'No'] });

    const result = svc.votePoll(trip.id, poll!.id, user1.id, 0);
    expect(result.error).toBeUndefined();
    expect(result.poll).toBeDefined();
    expect(result.poll!.options[0].voters).toHaveLength(1);
  });

  it('COLLAB-SVC-009: toggles vote off when voted again on same option', () => {
    const { user1, trip } = setup();
    const poll = svc.createPoll(trip.id, user1.id, { question: 'Q?', options: ['Yes', 'No'] });

    svc.votePoll(trip.id, poll!.id, user1.id, 0);
    const result = svc.votePoll(trip.id, poll!.id, user1.id, 0);
    expect(result.poll!.options[0].voters).toHaveLength(0);
  });
});

// ── listMessages with before cursor ──────────────────────────────────────────

describe('listMessages', () => {
  it('COLLAB-SVC-010: returns all messages when no before cursor', () => {
    const { user1, trip } = setup();
    svc.createMessage(trip.id, user1.id, 'Hello');
    svc.createMessage(trip.id, user1.id, 'World');

    const msgs = svc.listMessages(trip.id);
    expect(msgs).toHaveLength(2);
  });

  it('COLLAB-SVC-011: paginates using before cursor (returns messages with id < before)', () => {
    const { user1, trip } = setup();
    svc.createMessage(trip.id, user1.id, 'First');
    svc.createMessage(trip.id, user1.id, 'Second');
    const r3 = svc.createMessage(trip.id, user1.id, 'Third');

    const id3 = r3.message!.id;
    const msgs = svc.listMessages(trip.id, id3);
    expect(msgs.length).toBe(2);
    const texts = msgs.map(m => m.text);
    expect(texts).toContain('First');
    expect(texts).toContain('Second');
    expect(texts).not.toContain('Third');
  });

  it('COLLAB-SVC-012: returns messages in ascending order (reversed after DESC query)', () => {
    const { user1, trip } = setup();
    svc.createMessage(trip.id, user1.id, 'A');
    svc.createMessage(trip.id, user1.id, 'B');
    svc.createMessage(trip.id, user1.id, 'C');

    const msgs = svc.listMessages(trip.id);
    expect(msgs[0].text).toBe('A');
    expect(msgs[2].text).toBe('C');
  });

  it('COLLAB-SVC-013a: blanks the text of a deleted message but keeps the flag', () => {
    const { user1, trip } = setup();
    const r = svc.createMessage(trip.id, user1.id, 'Secret plans');
    svc.deleteMessage(trip.id, r.message!.id, user1.id);

    const msgs = svc.listMessages(trip.id);
    expect(msgs).toHaveLength(1);
    expect(msgs[0].text).toBe('');
    expect(msgs[0].deleted).toBe(1);
  });

  it('COLLAB-SVC-013b: blanks reply_text when the quoted message was deleted', () => {
    const { user1, trip } = setup();
    const original = svc.createMessage(trip.id, user1.id, 'Original secret');
    svc.createMessage(trip.id, user1.id, 'Quoting it', original.message!.id);
    svc.deleteMessage(trip.id, original.message!.id, user1.id);

    const msgs = svc.listMessages(trip.id);
    const reply = msgs.find(m => m.text === 'Quoting it')!;
    expect(reply.reply_text).toBe('');
  });

  it('COLLAB-SVC-013c: a deleted message cannot be quoted, and the create path blanks too', () => {
    const { user1, trip } = setup();
    const original = svc.createMessage(trip.id, user1.id, 'Original secret');
    svc.deleteMessage(trip.id, original.message!.id, user1.id);

    // Replying to something that is no longer there is refused outright.
    expect(svc.createMessage(trip.id, user1.id, 'Too late', original.message!.id)).toEqual({ error: 'reply_not_found' });

    // And the row the create path returns carries the same blanking listMessages
    // does, for a message quoted before the original was deleted.
    const second = svc.createMessage(trip.id, user1.id, 'Another secret');
    const quoting = svc.createMessage(trip.id, user1.id, 'Quoting it', second.message!.id);
    expect(quoting.message!.reply_text).toBe('Another secret');
    svc.deleteMessage(trip.id, second.message!.id, user1.id);
    expect(svc.listMessages(trip.id).find(m => m.text === 'Quoting it')!.reply_text).toBe('');
  });

  it('COLLAB-SVC-013: includes reactions grouped by emoji', () => {
    const { user1, trip } = setup();
    const r = svc.createMessage(trip.id, user1.id, 'React me');
    const msgId = r.message!.id;
    testDb.prepare('INSERT INTO collab_message_reactions (message_id, user_id, emoji) VALUES (?, ?, ?)').run(msgId, user1.id, '👍');

    const msgs = svc.listMessages(trip.id);
    expect(msgs[0].reactions).toBeDefined();
    expect(msgs[0].reactions).toHaveLength(1);
    expect(msgs[0].reactions[0].emoji).toBe('👍');
  });
});

// ── createMessage with invalid replyTo ───────────────────────────────────────

describe('createMessage', () => {
  it('COLLAB-SVC-014: returns error when replyTo message does not exist', () => {
    const { user1, trip } = setup();
    const result = svc.createMessage(trip.id, user1.id, 'Reply to nothing', 9999);
    expect(result.error).toBe('reply_not_found');
  });

  it('COLLAB-SVC-015: creates message with valid replyTo', () => {
    const { user1, trip } = setup();
    const r1 = svc.createMessage(trip.id, user1.id, 'Original');
    const r2 = svc.createMessage(trip.id, user1.id, 'Reply', r1.message!.id);
    expect(r2.error).toBeUndefined();
    expect(r2.message!.reply_to).toBe(r1.message!.id);
  });
});

// ── deleteMessage ownership check ─────────────────────────────────────────────

describe('deleteMessage', () => {
  it('COLLAB-SVC-016: returns error "not_owner" when user does not own message', () => {
    const { user1, user2, trip } = setup();
    const r = svc.createMessage(trip.id, user1.id, 'My message');

    const result = svc.deleteMessage(trip.id, r.message!.id, user2.id);
    expect(result.error).toBe('not_owner');
  });

  it('COLLAB-SVC-017: returns error "not_found" for nonexistent message', () => {
    const { user1, trip } = setup();
    const result = svc.deleteMessage(trip.id, 9999, user1.id);
    expect(result.error).toBe('not_found');
  });

  it('COLLAB-SVC-018: marks message as deleted when owner deletes it', () => {
    const { user1, trip } = setup();
    const r = svc.createMessage(trip.id, user1.id, 'Delete me');

    const result = svc.deleteMessage(trip.id, r.message!.id, user1.id);
    expect(result.error).toBeUndefined();

    const row = testDb.prepare('SELECT deleted FROM collab_messages WHERE id = ?').get(r.message!.id) as any;
    expect(row.deleted).toBe(1);
  });
});

// ── updateNote partial fields ─────────────────────────────────────────────────

describe('updateNote', () => {
  it('COLLAB-SVC-019: updates only title when other fields are undefined', () => {
    const { user1, trip } = setup();
    const note = svc.createNote(trip.id, user1.id, { title: 'Original', content: 'Some content', website: 'https://example.com' });

    svc.updateNote(trip.id, note.id, { title: 'Updated' });

    const updated = testDb.prepare('SELECT * FROM collab_notes WHERE id = ?').get(note.id) as any;
    expect(updated.title).toBe('Updated');
    expect(updated.content).toBe('Some content'); // unchanged
    expect(updated.website).toBe('https://example.com'); // unchanged
  });

  it('COLLAB-SVC-020: clears content when content is explicitly set to empty string', () => {
    const { user1, trip } = setup();
    const note = svc.createNote(trip.id, user1.id, { title: 'T', content: 'Old content' });

    svc.updateNote(trip.id, note.id, { content: '' });

    const updated = testDb.prepare('SELECT * FROM collab_notes WHERE id = ?').get(note.id) as any;
    expect(updated.content).toBe('');
  });

  it('COLLAB-SVC-021: updates website when website is defined', () => {
    const { user1, trip } = setup();
    const note = svc.createNote(trip.id, user1.id, { title: 'T' });

    svc.updateNote(trip.id, note.id, { website: 'https://new.example.com' });

    const updated = testDb.prepare('SELECT * FROM collab_notes WHERE id = ?').get(note.id) as any;
    expect(updated.website).toBe('https://new.example.com');
  });

  it('COLLAB-SVC-022: clears website when website is explicitly set to empty string', () => {
    const { user1, trip } = setup();
    const note = svc.createNote(trip.id, user1.id, { title: 'T', website: 'https://old.com' });

    svc.updateNote(trip.id, note.id, { website: '' });

    const updated = testDb.prepare('SELECT * FROM collab_notes WHERE id = ?').get(note.id) as any;
    expect(updated.website).toBe('');
  });

  it('COLLAB-SVC-023: returns null when note does not exist', () => {
    const { trip } = setup();
    const result = svc.updateNote(trip.id, 9999, { title: 'Ghost' });
    expect(result).toBeNull();
  });

  it('COLLAB-SVC-024: updates pinned flag', () => {
    const { user1, trip } = setup();
    const note = svc.createNote(trip.id, user1.id, { title: 'T', pinned: false });

    svc.updateNote(trip.id, note.id, { pinned: true });

    const updated = testDb.prepare('SELECT * FROM collab_notes WHERE id = ?').get(note.id) as any;
    expect(updated.pinned).toBe(1);
  });
});

// ── linkPreview ───────────────────────────────────────────────────────────────

describe('linkPreview', () => {
  afterEach(() => {
    vi.unstubAllGlobals();
  });

  it('COLLAB-SVC-025: returns OG title and description from HTML', async () => {
    vi.stubGlobal('fetch', vi.fn().mockResolvedValue({
      ok: true,
      text: async () => `
        <html>
          <head>
            <meta property="og:title" content="Test Title" />
            <meta property="og:description" content="Test Description" />
            <meta property="og:image" content="https://example.com/image.jpg" />
            <meta property="og:site_name" content="Example" />
          </head>
        </html>
      `,
    }));

    const result = await svc.linkPreview('https://example.com/page');
    expect(result.title).toBe('Test Title');
    expect(result.description).toBe('Test Description');
    expect(result.image).toBe('https://example.com/image.jpg');
    expect(result.url).toBe('https://example.com/page');
  });

  it('COLLAB-SVC-026: falls back to <title> tag when no og:title', async () => {
    vi.stubGlobal('fetch', vi.fn().mockResolvedValue({
      ok: true,
      text: async () => `<html><head><title>Page Title</title></head></html>`,
    }));

    const result = await svc.linkPreview('https://example.com/');
    expect(result.title).toBe('Page Title');
  });

  it('COLLAB-SVC-027: returns fallback when fetch response is not ok', async () => {
    vi.stubGlobal('fetch', vi.fn().mockResolvedValue({
      ok: false,
      text: async () => '',
    }));

    const result = await svc.linkPreview('https://example.com/bad');
    expect(result.title).toBeNull();
    expect(result.description).toBeNull();
    expect(result.url).toBe('https://example.com/bad');
  });

  it('COLLAB-SVC-028: returns fallback when SSRF check blocks the URL', async () => {
    // 169.254.x is link-local, which the real guard reports as private and blocked.
    mockCheckSsrf.mockResolvedValue({ allowed: false, isPrivate: true, error: 'SSRF blocked' });

    const result = await svc.linkPreview('https://169.254.169.254/');
    expect(result.title).toBeNull();
  });

  it('COLLAB-SVC-029: returns fallback when fetch throws (network error)', async () => {
    vi.stubGlobal('fetch', vi.fn().mockRejectedValue(new Error('Network error')));

    const result = await svc.linkPreview('https://example.com/net-error');
    expect(result.title).toBeNull();
    expect(result.url).toBe('https://example.com/net-error');
  });

  it('COLLAB-SVC-030a: returns the fallback when the page declares a body over the cap', async () => {
    vi.stubGlobal('fetch', vi.fn().mockResolvedValue({
      ok: true,
      headers: { get: (h: string) => (h === 'content-length' ? String(10 * 1024 * 1024) : null) },
      text: async () => '<html><head><title>Huge</title></head></html>',
    }));

    const result = await svc.linkPreview('https://example.com/huge');
    expect(result.title).toBeNull();
  });

  it('COLLAB-SVC-030b: reads only up to the cap and still scrapes the head tags', async () => {
    let cancelled = false;
    const chunks = [
      new TextEncoder().encode('<html><head><title>Head Title</title></head><body>'),
      new TextEncoder().encode('x'.repeat(1024 * 1024)),
    ];
    let i = 0;
    vi.stubGlobal('fetch', vi.fn().mockResolvedValue({
      ok: true,
      headers: { get: () => null },
      body: {
        getReader: () => ({
          read: async () => (i < chunks.length ? { done: false, value: chunks[i++] } : { done: true }),
          cancel: async () => { cancelled = true; },
        }),
      },
    }));

    const result = await svc.linkPreview('https://example.com/streamed');
    // The head arrives first, so the scrape still works; the megabyte of padding
    // past the 512KB budget is dropped and the reader is cancelled.
    expect(result.title).toBe('Head Title');
    expect(cancelled).toBe(true);
  });

  it('COLLAB-SVC-030: falls back to meta description tag when no og:description', async () => {
    vi.stubGlobal('fetch', vi.fn().mockResolvedValue({
      ok: true,
      text: async () => `
        <html><head>
          <meta name="description" content="Meta description here" />
        </head></html>
      `,
    }));

    const result = await svc.linkPreview('https://example.com/meta');
    expect(result.description).toBe('Meta description here');
  });
});

// ── linkPreview hardening ───────────────────────────────────────────────

describe('linkPreview hardening', () => {
  afterEach(() => {
    vi.unstubAllGlobals();
  });

  /** A fetch stub that records what it was called with. */
  const stubFetch = (response: Record<string, unknown>) => {
    const fetchMock = vi.fn().mockResolvedValue({ headers: { get: () => null }, ...response });
    vi.stubGlobal('fetch', fetchMock);
    return fetchMock;
  };

  it('COLLAB-SVC-039: asks the SSRF guard to refuse internal targets even where the instance allows them', async () => {
    stubFetch({ ok: true, text: async () => '<html/>' });
    await freshSvc().linkPreview('https://example.com/guard-args');
    // The second argument is what keeps ALLOW_INTERNAL_NETWORK from widening a
    // route whose URL comes from whoever is typing in the chat.
    expect(mockCheckSsrf).toHaveBeenCalledWith('https://example.com/guard-args', true);
  });

  it('COLLAB-SVC-040: pins the connection to the checked IP and refuses to follow redirects', async () => {
    const dispatcher = { close: vi.fn().mockResolvedValue(undefined) };
    mockCreatePinnedDispatcher.mockReturnValueOnce(dispatcher);
    const fetchMock = stubFetch({ ok: true, text: async () => '<html/>' });

    await freshSvc().linkPreview('https://example.com/init');

    const init = fetchMock.mock.calls[0][1] as Record<string, unknown>;
    // Without redirect:'error' a public URL could 302 onto an internal one, and
    // the pin does not cover that hop: Node skips the pinned lookup for a literal IP.
    expect(init.redirect).toBe('error');
    expect(init.signal).toBeInstanceOf(AbortSignal);
    expect(mockCreatePinnedDispatcher).toHaveBeenCalledWith('93.184.216.34');
    expect(init.dispatcher).toBe(dispatcher);
    // One Agent is built per preview; leaving it open leaks its sockets.
    expect(dispatcher.close).toHaveBeenCalled();
  });

  it('COLLAB-SVC-041: a refused URL comes back with one constant reason, never the one the guard gave', async () => {
    // The guard distinguishes "could not resolve", "private address" and
    // "loopback". Relaying that verbatim turns the route into a probe for the
    // internal DNS of the server, one guessed hostname at a time.
    mockCheckSsrf.mockResolvedValue({ allowed: false, isPrivate: true, resolvedIp: '10.0.0.5', error: 'Requests to private/internal network addresses are not allowed. Set ALLOW_INTERNAL_NETWORK=true to permit this for self-hosted setups.' });
    const result = await freshSvc().linkPreview('http://nas.internal/');
    expect(result.error).toBe('URL not allowed');
    expect(JSON.stringify(result)).not.toContain('ALLOW_INTERNAL_NETWORK');
    expect(JSON.stringify(result)).not.toContain('private');
  });

  it('COLLAB-SVC-042: a document built to make the scrape backtrack still returns promptly', async () => {
    // '<meta ' with no '>' anywhere used to make each unbounded [^>]* rescan the
    // rest of the document from every '<meta' it passed: quadratic, and the byte
    // cap admits half a megabyte of it. At the 240KB used here the unbounded form
    // measured ~58s; bounded it is well under a second, so the budget below is not
    // a close call under CI load. Node is single-threaded, so that is the
    // whole server, on one request, from any trip member.
    stubFetch({ ok: true, text: async () => '<meta '.repeat(40_000) });
    const started = Date.now();
    const result = await freshSvc().linkPreview('https://example.com/redos');
    expect(Date.now() - started).toBeLessThan(5_000);
    expect(result.title).toBeNull();
  });

  it('COLLAB-SVC-043: a body that is not markup is dropped instead of scraped', async () => {
    const cancel = vi.fn().mockResolvedValue(undefined);
    stubFetch({
      ok: true,
      headers: { get: (h: string) => (h === 'content-type' ? 'video/mp4' : null) },
      body: { getReader: () => ({ read: async () => ({ done: true }), cancel }), cancel },
      text: async () => '<title>Nicht gelesen</title>',
    });
    const result = await freshSvc().linkPreview('https://example.com/video');
    expect(result.title).toBeNull();
    // An unread body keeps its socket reserved until the collector runs.
    expect(cancel).toHaveBeenCalled();
  });

  it('COLLAB-SVC-044: an og:image the client could not load safely is dropped', async () => {
    // The client puts this straight into an <img src>. A previewed page must not
    // be able to aim that at a scheme, or at a host, of its choosing.
    for (const [image, expected] of [
      ['javascript:alert(1)', null],
      ['data:image/png;base64,AAAA', null],
      ['file:///etc/passwd', null],
      ['//evil.example/x.png', null],
      ['https://cdn.example/ok.png', 'https://cdn.example/ok.png'],
      ['http://cdn.example/ok.png', 'http://cdn.example/ok.png'],
    ] as const) {
      stubFetch({ ok: true, text: async () => `<meta property="og:image" content="${image}">` });
      const result = await freshSvc().linkPreview(`https://example.com/img-${encodeURIComponent(image)}`);
      expect(result.image).toBe(expected);
    }
  });

  it('COLLAB-SVC-045: a preview already fetched is served again without a second request', async () => {
    const fetchMock = stubFetch({ ok: true, text: async () => '<title>Einmal geholt</title>' });
    const service = freshSvc();
    const first = await service.linkPreview('https://example.com/cached', 7);
    const second = await service.linkPreview('https://example.com/cached', 7);
    expect(first.title).toBe('Einmal geholt');
    expect(second.title).toBe('Einmal geholt');
    expect(fetchMock).toHaveBeenCalledTimes(1);
  });

  it('COLLAB-SVC-046: the budget runs out per user, and cached previews do not charge it', async () => {
    const fetchMock = stubFetch({ ok: true, text: async () => '<title>T</title>' });
    const service = freshSvc();

    // 60 distinct URLs is the whole allowance for a minute.
    for (let i = 0; i < 60; i++) {
      expect((await service.linkPreview(`https://example.com/p${i}`, 42)).rateLimited).toBeUndefined();
    }
    expect((await service.linkPreview('https://example.com/p60', 42)).rateLimited).toBe(true);
    expect(fetchMock).toHaveBeenCalledTimes(60);

    // The client re-requests every preview it renders on each mount, so a reload
    // has to stay free: otherwise the fix is the regression.
    expect((await service.linkPreview('https://example.com/p0', 42)).rateLimited).toBeUndefined();
    expect(fetchMock).toHaveBeenCalledTimes(60);

    // Another user has their own allowance.
    expect((await service.linkPreview('https://example.com/p60', 43)).rateLimited).toBeUndefined();
  });

  it('COLLAB-SVC-048: simultaneous askers for one URL share a single outbound fetch', async () => {
    // The client renders a preview per message and deduplicates nothing, so the
    // same link posted twenty times arrives as twenty requests at once — none of
    // which finds a cache entry, because the first has not answered yet.
    let release: (() => void) | undefined;
    const gate = new Promise<void>(resolve => { release = resolve; });
    const fetchMock = vi.fn().mockImplementation(async () => {
      await gate;
      return { ok: true, headers: { get: () => null }, text: async () => '<title>Geteilt</title>' };
    });
    vi.stubGlobal('fetch', fetchMock);

    const service = freshSvc();
    const all = Promise.all(Array.from({ length: 20 }, () => service.linkPreview('https://example.com/same', 9)));
    release!();
    const results = await all;

    expect(fetchMock).toHaveBeenCalledTimes(1);
    expect(results.every(r => r.title === 'Geteilt')).toBe(true);
    // And the nineteen that joined were not charged for a fetch they did not make.
    expect(results.some(r => r.rateLimited)).toBe(false);
  });

  it('COLLAB-SVC-047: a body over the cap, and one behind a failed response, are both released', async () => {
    for (const response of [
      { ok: true, headers: { get: (h: string) => (h === 'content-length' ? String(10 * 1024 * 1024) : null) } },
      { ok: false },
    ]) {
      const cancel = vi.fn().mockResolvedValue(undefined);
      stubFetch({ ...response, body: { getReader: () => ({ read: async () => ({ done: true }), cancel }), cancel }, text: async () => '' });
      const result = await freshSvc().linkPreview(`https://example.com/drop-${String(response.ok)}`);
      expect(result.title).toBeNull();
      expect(cancel).toHaveBeenCalled();
    }
  });
});

// COLLAB-SVC-031..033 (collab.bridge delegation) were deleted with the bridge —
// its last consumers (the legacy tripService and the legacy get_trip_summary
// registrar) migrated into the DI-native TripsService/TripsMcp.

// ── Post-migration hardening (transactions, scoping, guards) ──────────────────

describe('hardening', () => {
  it('COLLAB-SVC-034: votePoll switch is atomic — prior vote survives a failed INSERT', () => {
    const { user1, trip } = setup();
    const dbs = new DatabaseService(testDb);
    const failing = new CollabService(dbs, new PermissionsService(dbs), new RealtimeService(), notificationsStub(), collabFx.storage, new RateLimitService());
    const poll = failing.createPoll(trip.id, user1.id, { question: 'Q?', options: ['A', 'B'] });
    failing.votePoll(trip.id, poll!.id, user1.id, 0);

    const realRun = dbs.run.bind(dbs);
    const spy = vi.spyOn(dbs, 'run').mockImplementation((sql: string, ...params: unknown[]) => {
      if (sql.includes('INSERT INTO collab_poll_votes')) throw new Error('boom');
      return realRun(sql, ...params);
    });
    // Single-choice switch: DELETE prior votes, then the INSERT fails — the
    // transaction must roll the DELETE back too.
    expect(() => failing.votePoll(trip.id, poll!.id, user1.id, 1)).toThrow('boom');
    spy.mockRestore();

    const votes = testDb.prepare('SELECT option_index FROM collab_poll_votes WHERE poll_id = ?').all(poll!.id) as { option_index: number }[];
    expect(votes).toEqual([{ option_index: 0 }]);
  });

  it('COLLAB-SVC-035: deleteNote is atomic — trip_files rows survive a failed note DELETE', async () => {
    const { user1, trip } = setup();
    const dbs = new DatabaseService(testDb);
    const failing = new CollabService(dbs, new PermissionsService(dbs), new RealtimeService(), notificationsStub(), collabFx.storage, new RateLimitService());
    const note = failing.createNote(trip.id, user1.id, { title: 'With file' });
    testDb.prepare('INSERT INTO trip_files (trip_id, note_id, filename, original_name) VALUES (?, ?, ?, ?)')
      .run(trip.id, note.id, 'files/a.pdf', 'a.pdf');

    const realRun = dbs.run.bind(dbs);
    const spy = vi.spyOn(dbs, 'run').mockImplementation((sql: string, ...params: unknown[]) => {
      if (sql.includes('DELETE FROM collab_notes')) throw new Error('boom');
      return realRun(sql, ...params);
    });
    await expect(failing.deleteNote(trip.id, note.id)).rejects.toThrow('boom');
    spy.mockRestore();

    expect(testDb.prepare('SELECT COUNT(*) as c FROM trip_files WHERE note_id = ?').get(note.id)).toEqual({ c: 1 });
    expect(testDb.prepare('SELECT COUNT(*) as c FROM collab_notes WHERE id = ?').get(note.id)).toEqual({ c: 1 });
  });

  it('COLLAB-SVC-036: a failing storage delete is swallowed — note + file deletes still succeed', async () => {
    const { user1, trip } = setup();
    const dbs = new DatabaseService(testDb);
    const failingStorage = { delete: vi.fn().mockRejectedValue(new Error('EACCES')) };
    const failing = new CollabService(dbs, new PermissionsService(dbs), new RealtimeService(), notificationsStub(), failingStorage as unknown as import('../../../src/nest/storage/storage.service').StorageService, new RateLimitService());
    const note = failing.createNote(trip.id, user1.id, { title: 'Sticky file' });
    testDb.prepare('INSERT INTO trip_files (trip_id, note_id, filename, original_name) VALUES (?, ?, ?, ?)')
      .run(trip.id, note.id, 'stuck.pdf', 'stuck.pdf');
    const fileId = (testDb.prepare('SELECT id FROM trip_files WHERE note_id = ?').get(note.id) as { id: number }).id;

    expect(await failing.deleteNoteFile(trip.id, note.id, fileId)).toBe(true);
    expect(testDb.prepare('SELECT COUNT(*) as c FROM trip_files WHERE id = ?').get(fileId)).toEqual({ c: 0 });

    testDb.prepare('INSERT INTO trip_files (trip_id, note_id, filename, original_name) VALUES (?, ?, ?, ?)')
      .run(trip.id, note.id, 'stuck2.pdf', 'stuck2.pdf');
    expect(await failing.deleteNote(trip.id, note.id)).toBe(true);
    expect(testDb.prepare('SELECT COUNT(*) as c FROM collab_notes WHERE id = ?').get(note.id)).toEqual({ c: 0 });
  });

  it('COLLAB-SVC-036: getFormattedNoteById is trip-scoped and null-safe', () => {
    const { user1, trip } = setup();
    const otherTrip = createTrip(testDb, user1.id);
    const note = svc.createNote(trip.id, user1.id, { title: 'Scoped' });

    expect(svc.getFormattedNoteById(trip.id, note.id)!.title).toBe('Scoped');
    expect(svc.getFormattedNoteById(otherTrip.id, note.id)).toBeNull();
    expect(svc.getFormattedNoteById(trip.id, 9999)).toBeNull();
  });

  it('COLLAB-SVC-037: votePoll rejects a non-integer option index with "invalid_index"', () => {
    const { user1, trip } = setup();
    const poll = svc.createPoll(trip.id, user1.id, { question: 'Q?', options: ['A', 'B'] });

    expect(svc.votePoll(trip.id, poll!.id, user1.id, '0' as unknown as number).error).toBe('invalid_index');
    expect(svc.votePoll(trip.id, poll!.id, user1.id, 0.5).error).toBe('invalid_index');
    expect(testDb.prepare('SELECT COUNT(*) as c FROM collab_poll_votes WHERE poll_id = ?').get(poll!.id)).toEqual({ c: 0 });
  });

  it('COLLAB-SVC-038: linkPreview returns the fallback for a malformed URL without throwing', async () => {
    const result = await svc.linkPreview('not a url');
    expect(result).toEqual({ title: null, description: null, image: null, url: 'not a url' });
    expect(mockCheckSsrf).not.toHaveBeenCalled();
  });
});