const express = require('express');
const request = require('supertest');
const fs = require('fs');
const path = require('path');
const os = require('os');
const { makeTorrent } = require('../src/torrent');

// ── shared temp dir ─────────────────────────────────────────────────────────
let tmpDir;

beforeAll(() => {
  tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'qbt-test-'));
  process.env.DOWNLOAD_PATH = tmpDir;
  process.env.MEDIA_ROOT = tmpDir;
  process.env.MAX_CONCURRENT_DOWNLOADS = '0'; // no actual downloads
});

afterAll(() => {
  fs.rmSync(tmpDir, { recursive: true, force: true });
});

// Fresh qbt module + express app for each test (module-level state isolation)
function makeApp() {
  let qbtModule;
  jest.isolateModules(() => {
    qbtModule = require('../src/qbt');
  });
  const app = express();
  app.use(express.urlencoded({ extended: false }));
  app.use(express.json());
  qbtModule.register(app);
  return { app, qbt: qbtModule };
}

// Helper: clean state file between tests that check persistence
function cleanState() {
  try { fs.unlinkSync(path.join(tmpDir, '.queue-state.json')); } catch {}
}

// Helper: build a real .torrent buffer
function makeTorrentBuf(webseedUrl = 'http://webshare-api:3001/stream/testident') {
  return makeTorrent({ name: 'test.mkv', size: 1000, webseedUrl });
}

// ── auth endpoints ───────────────────────────────────────────────────────────
describe('auth', () => {
  let app;
  beforeAll(() => { cleanState(); ({ app } = makeApp()); });

  it('POST /api/v2/auth/login → Ok.', async () => {
    const res = await request(app).post('/api/v2/auth/login').send('username=a&password=b');
    expect(res.status).toBe(200);
    expect(res.text).toBe('Ok.');
  });

  it('GET /api/v2/auth/logout → Ok.', async () => {
    const res = await request(app).get('/api/v2/auth/logout');
    expect(res.status).toBe(200);
    expect(res.text).toBe('Ok.');
  });
});

// ── app info endpoints ───────────────────────────────────────────────────────
describe('app info', () => {
  let app;
  beforeAll(() => { cleanState(); ({ app } = makeApp()); });

  it('GET /api/v2/app/version → 5.0.0', async () => {
    expect((await request(app).get('/api/v2/app/version')).text).toBe('5.0.0');
  });

  it('GET /api/v2/app/webapiVersion → 2.8.3', async () => {
    expect((await request(app).get('/api/v2/app/webapiVersion')).text).toBe('2.8.3');
  });

  it('GET /api/v2/app/buildInfo → JSON with version fields', async () => {
    const res = await request(app).get('/api/v2/app/buildInfo');
    expect(res.status).toBe(200);
    expect(res.body).toMatchObject({ bitness: 64, libtorrent: '2.0.10' });
  });

  it('GET /api/v2/app/preferences → JSON with save_path', async () => {
    const res = await request(app).get('/api/v2/app/preferences');
    expect(res.status).toBe(200);
    expect(res.body.save_path).toBe(tmpDir + '/');
    expect(res.body.temp_path_enabled).toBe(false);
  });
});

// ── torrent list / properties / categories ───────────────────────────────────
describe('torrent list', () => {
  let app;
  beforeAll(() => { cleanState(); ({ app } = makeApp()); });

  it('GET /api/v2/torrents/info → empty array initially', async () => {
    const res = await request(app).get('/api/v2/torrents/info');
    expect(res.status).toBe(200);
    expect(res.body).toEqual([]);
  });

  it('GET /api/v2/torrents/properties → 404 for unknown hash', async () => {
    const res = await request(app).get('/api/v2/torrents/properties?hash=nonexistent');
    expect(res.status).toBe(404);
  });

  it('GET /api/v2/torrents/categories → returns webshare category', async () => {
    const res = await request(app).get('/api/v2/torrents/categories');
    expect(res.status).toBe(200);
    expect(res.body).toHaveProperty('webshare');
    expect(res.body.webshare.savePath).toBe(tmpDir + '/');
  });
});

// ── add via .torrent upload ──────────────────────────────────────────────────
describe('POST /api/v2/torrents/add (.torrent upload)', () => {
  let app;
  beforeEach(() => { cleanState(); ({ app } = makeApp()); });

  it('responds Ok. and item appears in info list', async () => {
    const torrent = makeTorrentBuf();
    const addRes = await request(app)
      .post('/api/v2/torrents/add')
      .attach('torrents', torrent, 'test.torrent');
    expect(addRes.status).toBe(200);
    expect(addRes.text).toBe('Ok.');

    const infoRes = await request(app).get('/api/v2/torrents/info');
    expect(infoRes.body).toHaveLength(1);
    expect(infoRes.body[0].name).toBe('test');
    expect(infoRes.body[0].state).toBe('queuedDL');
    expect(infoRes.body[0].eta).toBe(9999);
  });

  it('sets category from request body', async () => {
    const torrent = makeTorrentBuf('http://webshare-api:3001/stream/cattest');
    await request(app)
      .post('/api/v2/torrents/add')
      .field('category', 'webshare')
      .attach('torrents', torrent, 'cat.torrent');
    const { body } = await request(app).get('/api/v2/torrents/info');
    expect(body[0].category).toBe('webshare');
  });

  it('skips duplicate (same webseed URL)', async () => {
    const torrent = makeTorrentBuf('http://webshare-api:3001/stream/dup');
    await request(app).post('/api/v2/torrents/add').attach('torrents', torrent, 'dup.torrent');
    await request(app).post('/api/v2/torrents/add').attach('torrents', torrent, 'dup.torrent');
    const { body } = await request(app).get('/api/v2/torrents/info');
    expect(body).toHaveLength(1);
  });

  it('skips torrent with no url-list', async () => {
    // A buffer that decodes to a dict without url-list
    const invalid = Buffer.from('d4:infod6:lengthi0e4:name4:teste12:piece lengthi524288e6:piecese', 'utf8');
    await request(app).post('/api/v2/torrents/add').attach('torrents', invalid, 'bad.torrent');
    const { body } = await request(app).get('/api/v2/torrents/info');
    expect(body).toHaveLength(0);
  });

  it('item has correct save_path and content_path', async () => {
    const torrent = makeTorrentBuf('http://webshare-api:3001/stream/pathtest');
    await request(app).post('/api/v2/torrents/add').attach('torrents', torrent, 'path.torrent');
    const { body } = await request(app).get('/api/v2/torrents/info');
    expect(body[0].save_path).toBe(tmpDir + '/');
    expect(body[0].content_path).toContain(tmpDir);
  });

  it('GET /api/v2/torrents/properties returns data for added item', async () => {
    const torrent = makeTorrentBuf('http://webshare-api:3001/stream/proptest');
    await request(app).post('/api/v2/torrents/add').attach('torrents', torrent, 'prop.torrent');
    const { body: items } = await request(app).get('/api/v2/torrents/info');
    const hash = items[0].hash;

    const res = await request(app).get(`/api/v2/torrents/properties?hash=${hash}`);
    expect(res.status).toBe(200);
    expect(res.body.hash).toBe(hash);
  });
});

// ── add via URL list (legacy fallback) ──────────────────────────────────────
describe('POST /api/v2/torrents/add (url list)', () => {
  let app;
  beforeEach(() => { cleanState(); ({ app } = makeApp()); });

  it('adds item from url list', async () => {
    await request(app)
      .post('/api/v2/torrents/add')
      .send('urls=http://webshare-api:3001/stream/urltest1');
    const { body } = await request(app).get('/api/v2/torrents/info');
    expect(body).toHaveLength(1);
    expect(body[0].name).toBe('urltest1');
  });

  it('extracts ident from /download/ path', async () => {
    await request(app)
      .post('/api/v2/torrents/add')
      .send('urls=http://webshare-api:3001/download/myident99');
    const { body } = await request(app).get('/api/v2/torrents/info');
    expect(body[0].name).toBe('myident99');
  });

  it('skips duplicate URLs', async () => {
    const url = 'http://webshare-api:3001/stream/dup2';
    await request(app).post('/api/v2/torrents/add').send(`urls=${url}`);
    await request(app).post('/api/v2/torrents/add').send(`urls=${url}`);
    const { body } = await request(app).get('/api/v2/torrents/info');
    expect(body).toHaveLength(1);
  });
});

// ── delete ───────────────────────────────────────────────────────────────────
describe('POST /api/v2/torrents/delete', () => {
  let app;
  beforeEach(() => { cleanState(); ({ app } = makeApp()); });

  async function addAndGetHash(webseedUrl = 'http://webshare-api:3001/stream/deltest') {
    const torrent = makeTorrentBuf(webseedUrl);
    await request(app).post('/api/v2/torrents/add').attach('torrents', torrent, 't.torrent');
    const { body } = await request(app).get('/api/v2/torrents/info');
    return body[0].hash;
  }

  it('removes item from list', async () => {
    const hash = await addAndGetHash();
    await request(app).post('/api/v2/torrents/delete').send(`hashes=${hash}&deleteFiles=false`);
    const { body } = await request(app).get('/api/v2/torrents/info');
    expect(body).toHaveLength(0);
  });

  it('responds Ok.', async () => {
    const hash = await addAndGetHash('http://webshare-api:3001/stream/delok');
    const res = await request(app).post('/api/v2/torrents/delete')
      .send(`hashes=${hash}&deleteFiles=false`);
    expect(res.text).toBe('Ok.');
  });

  it('deleteFiles=true attempts fs.unlink on the file', async () => {
    const hash = await addAndGetHash('http://webshare-api:3001/stream/delfile');
    // Write a fake file so unlinkSync has something to delete
    const name = (await request(app).get('/api/v2/torrents/info')).body[0].name;
    const fpath = path.join(tmpDir, name);
    fs.writeFileSync(fpath, 'fake data');

    await request(app).post('/api/v2/torrents/delete').send(`hashes=${hash}&deleteFiles=true`);

    expect(fs.existsSync(fpath)).toBe(false);
    const { body } = await request(app).get('/api/v2/torrents/info');
    expect(body).toHaveLength(0);
  });

  it('deleteFiles=false does not delete file', async () => {
    const hash = await addAndGetHash('http://webshare-api:3001/stream/nodelf');
    const name = (await request(app).get('/api/v2/torrents/info')).body[0].name;
    const fpath = path.join(tmpDir, name);
    fs.writeFileSync(fpath, 'keep me');

    await request(app).post('/api/v2/torrents/delete').send(`hashes=${hash}&deleteFiles=false`);

    expect(fs.existsSync(fpath)).toBe(true);
    fs.unlinkSync(fpath);
  });

  it('ignores unknown hashes gracefully', async () => {
    const res = await request(app).post('/api/v2/torrents/delete')
      .send('hashes=nonexistenthash&deleteFiles=false');
    expect(res.status).toBe(200);
    expect(res.text).toBe('Ok.');
  });
});

// ── no-op control endpoints ──────────────────────────────────────────────────
describe('no-op control endpoints', () => {
  let app;
  beforeAll(() => { cleanState(); ({ app } = makeApp()); });

  const endpoints = [
    'pause', 'resume', 'setCategory', 'setLocation',
    'rename', 'createCategory', 'editCategory', 'removeCategories',
  ];
  for (const ep of endpoints) {
    it(`POST /api/v2/torrents/${ep} → Ok.`, async () => {
      const res = await request(app).post(`/api/v2/torrents/${ep}`).send('hashes=abc');
      expect(res.status).toBe(200);
      expect(res.text).toBe('Ok.');
    });
  }
});

// ── state persistence ────────────────────────────────────────────────────────
describe('state persistence', () => {
  beforeEach(cleanState);

  it('saveState writes JSON file and loadState restores queuedDL items', async () => {
    const { app: app1 } = makeApp();
    const torrent = makeTorrentBuf('http://webshare-api:3001/stream/persist1');
    await request(app1).post('/api/v2/torrents/add').attach('torrents', torrent, 't.torrent');

    // State file should exist
    const stateFile = path.join(tmpDir, '.queue-state.json');
    expect(fs.existsSync(stateFile)).toBe(true);
    const state = JSON.parse(fs.readFileSync(stateFile));
    expect(state).toHaveLength(1);
    expect(state[0].state).toBe('queuedDL');
    expect(state[0].webseedUrl).toBe('http://webshare-api:3001/stream/persist1');
  });

  it('loadState re-queues downloading items and deletes partial files', async () => {
    const webseedUrl = 'http://webshare-api:3001/stream/requeue1';
    const partialFile = path.join(tmpDir, 'partial.mkv');
    fs.writeFileSync(partialFile, 'partial data');

    // Write a state file manually as if a download was in progress
    const state = [{ hash: 'abc123', name: 'partial.mkv', size: 0, progress: 0.5,
      state: 'downloading', category: '', webseedUrl }];
    fs.writeFileSync(path.join(tmpDir, '.queue-state.json'), JSON.stringify(state));

    const { app: app2 } = makeApp();
    const { body } = await request(app2).get('/api/v2/torrents/info');
    // Should be re-queued
    expect(body).toHaveLength(1);
    expect(body[0].state).toBe('queuedDL');
    expect(body[0].progress).toBe(0);
    // Partial file should be deleted
    expect(fs.existsSync(partialFile)).toBe(false);
  });

  it('loadState restores uploading items when file exists', async () => {
    const fname = 'done.mkv';
    fs.writeFileSync(path.join(tmpDir, fname), 'complete file');
    const state = [{ hash: 'def456', name: fname, size: 100, progress: 1.0,
      state: 'uploading', category: '' }];
    fs.writeFileSync(path.join(tmpDir, '.queue-state.json'), JSON.stringify(state));

    const { app: app3 } = makeApp();
    const { body } = await request(app3).get('/api/v2/torrents/info');
    expect(body).toHaveLength(1);
    expect(body[0].state).toBe('uploading');
    expect(body[0].progress).toBe(1.0);

    fs.unlinkSync(path.join(tmpDir, fname));
  });

  it('loadState re-queues uploading items when file is missing', async () => {
    const webseedUrl = 'http://webshare-api:3001/stream/missingup';
    const state = [{ hash: 'ghi789', name: 'missing.mkv', size: 0, progress: 1.0,
      state: 'uploading', category: '', webseedUrl }];
    fs.writeFileSync(path.join(tmpDir, '.queue-state.json'), JSON.stringify(state));

    const { app: app4 } = makeApp();
    const { body } = await request(app4).get('/api/v2/torrents/info');
    expect(body).toHaveLength(1);
    expect(body[0].state).toBe('queuedDL');
  });

  it('loadState re-queues error items', async () => {
    const webseedUrl = 'http://webshare-api:3001/stream/errretry';
    const state = [{ hash: 'jkl000', name: 'errored.mkv', size: 0, progress: 0,
      state: 'error', category: '', webseedUrl }];
    fs.writeFileSync(path.join(tmpDir, '.queue-state.json'), JSON.stringify(state));

    const { app: app5 } = makeApp();
    const { body } = await request(app5).get('/api/v2/torrents/info');
    expect(body).toHaveLength(1);
    expect(body[0].state).toBe('queuedDL');
  });

  it('loadState preserves other states as-is', async () => {
    const state = [{ hash: 'mno111', name: 'other.mkv', size: 0, progress: 0,
      state: 'stalledUP', category: '' }];
    fs.writeFileSync(path.join(tmpDir, '.queue-state.json'), JSON.stringify(state));

    const { app: app6 } = makeApp();
    const { body } = await request(app6).get('/api/v2/torrents/info');
    expect(body).toHaveLength(1);
    expect(body[0].state).toBe('stalledUP');
  });

  it('loadState handles missing state file gracefully', () => {
    expect(() => {
      const { app: app7 } = makeApp();
      return app7; // just needs to not throw
    }).not.toThrow();
  });

  it('loadState handles corrupt state file gracefully', () => {
    fs.writeFileSync(path.join(tmpDir, '.queue-state.json'), 'not valid json{{{');
    expect(() => { makeApp(); }).not.toThrow();
  });
});

// ── cleanupStaging ───────────────────────────────────────────────────────────
describe('cleanupStaging (runs on startup)', () => {
  beforeEach(cleanState);
  afterEach(cleanState);

  it('deletes files with nlink > 1 immediately', () => {
    const fpath = path.join(tmpDir, 'hardlinked.mkv');
    fs.writeFileSync(fpath, 'data');
    // Create a hardlink so nlink > 1
    const link = path.join(tmpDir, 'hardlinked-link.mkv');
    fs.linkSync(fpath, link);

    makeApp(); // triggers cleanupStaging

    expect(fs.existsSync(fpath)).toBe(false);
    fs.unlinkSync(link); // cleanup the link
  });

  it('deletes files older than 2 hours that are not active downloads', () => {
    const fpath = path.join(tmpDir, 'stale.mkv');
    fs.writeFileSync(fpath, 'old data');
    // Backdate mtime to 3 hours ago
    const threeHoursAgo = new Date(Date.now() - 3 * 60 * 60 * 1000);
    fs.utimesSync(fpath, threeHoursAgo, threeHoursAgo);

    makeApp(); // triggers cleanupStaging

    expect(fs.existsSync(fpath)).toBe(false);
  });

  it('preserves files that are currently downloading', () => {
    const fname = 'active-download.mkv';
    const fpath = path.join(tmpDir, fname);
    fs.writeFileSync(fpath, 'partial');
    // Backdate to 3 hours ago — would normally be deleted
    const old = new Date(Date.now() - 3 * 60 * 60 * 1000);
    fs.utimesSync(fpath, old, old);

    // Write state showing this file is actively downloading
    fs.writeFileSync(path.join(tmpDir, '.queue-state.json'), JSON.stringify([{
      hash: 'activehash', name: fname, size: 0, progress: 0.5,
      state: 'downloading', category: '', webseedUrl: 'http://webshare-api:3001/stream/active',
    }]));

    makeApp(); // triggers cleanupStaging

    // File should still exist because it's in active download state
    expect(fs.existsSync(fpath)).toBe(true);
    fs.unlinkSync(fpath);
  });

  it('preserves recent files (< 2 hours old)', () => {
    const fpath = path.join(tmpDir, 'recent.mkv');
    fs.writeFileSync(fpath, 'fresh data');
    // mtime is just now, well under 2 hours

    makeApp();

    expect(fs.existsSync(fpath)).toBe(true);
    fs.unlinkSync(fpath);
  });

  it('skips dotfiles (like .queue-state.json)', () => {
    // State file must not be deleted even if it's old
    const stateContent = JSON.stringify([]);
    fs.writeFileSync(path.join(tmpDir, '.queue-state.json'), stateContent);
    const old = new Date(Date.now() - 3 * 60 * 60 * 1000);
    fs.utimesSync(path.join(tmpDir, '.queue-state.json'), old, old);

    makeApp();

    expect(fs.existsSync(path.join(tmpDir, '.queue-state.json'))).toBe(true);
  });
});

// ── download pipeline (mocked http) ─────────────────────────────────────────
describe('download pipeline', () => {
  const { EventEmitter } = require('events');

  beforeEach(() => {
    cleanState();
    // Allow 1 concurrent download for these tests
    process.env.MAX_CONCURRENT_DOWNLOADS = '1';
  });

  afterEach(() => {
    process.env.MAX_CONCURRENT_DOWNLOADS = '0';
    jest.restoreAllMocks();
  });

  it('marks entry as uploading after successful download', async () => {
    // Mock http.get to write a small file
    const httpMod = require('http');
    jest.spyOn(httpMod, 'get').mockImplementation((url, cb) => {
      const res = new EventEmitter();
      res.statusCode = 200;
      res.headers = { 'content-length': '10' };
      res.resume = jest.fn();
      res.destroy = jest.fn();
      res.pipe = jest.fn((dest) => {
        setImmediate(() => {
          // Write actual content to the file so createWriteStream's finish fires
          dest.emit('finish');
        });
        return dest;
      });
      setImmediate(() => cb(res));
      return { on: jest.fn() };
    });

    // Also mock fs.createWriteStream to avoid writing real files here
    jest.spyOn(fs, 'createWriteStream').mockReturnValue(
      (() => {
        const w = new EventEmitter();
        w.close = (cb) => cb && cb();
        return w;
      })()
    );

    const { app } = makeApp();
    const torrent = makeTorrentBuf('http://webshare-api:3001/stream/dltest');
    await request(app).post('/api/v2/torrents/add').attach('torrents', torrent, 'dl.torrent');

    // Wait for async download to complete
    await new Promise(r => setTimeout(r, 100));

    const { body } = await request(app).get('/api/v2/torrents/info');
    expect(body[0].state).toBe('uploading');
    expect(body[0].progress).toBe(1.0);
  });

  it('marks entry as error on HTTP failure', async () => {
    const httpMod = require('http');
    jest.spyOn(httpMod, 'get').mockImplementation((url, cb) => {
      const res = new EventEmitter();
      res.statusCode = 404;
      res.resume = jest.fn();
      setImmediate(() => cb(res));
      return { on: jest.fn() };
    });

    const { app } = makeApp();
    const torrent = makeTorrentBuf('http://webshare-api:3001/stream/err404');
    await request(app).post('/api/v2/torrents/add').attach('torrents', torrent, 'err.torrent');

    await new Promise(r => setTimeout(r, 100));

    const { body } = await request(app).get('/api/v2/torrents/info');
    expect(body[0].state).toBe('error');
  });

  it('retries on stalled download (ECONNRESET)', async () => {
    const httpMod = require('http');
    let callCount = 0;
    jest.spyOn(httpMod, 'get').mockImplementation((url, cb) => {
      callCount++;
      const res = new EventEmitter();
      res.statusCode = 200;
      res.headers = { 'content-length': '10' };
      res.resume = jest.fn();
      res.destroy = jest.fn();
      res.pipe = jest.fn((dest) => {
        setImmediate(() => {
          if (callCount === 1) {
            res.emit('error', new Error('ECONNRESET'));
          } else {
            dest.emit('finish');
          }
        });
        return dest;
      });
      setImmediate(() => cb(res));
      return { on: jest.fn() };
    });

    jest.spyOn(fs, 'createWriteStream').mockReturnValue(
      (() => { const w = new EventEmitter(); w.close = (cb) => cb && cb(); return w; })()
    );
    jest.spyOn(fs, 'unlinkSync').mockImplementation(() => {});

    const { app } = makeApp();
    const torrent = makeTorrentBuf('http://webshare-api:3001/stream/retry');
    await request(app).post('/api/v2/torrents/add').attach('torrents', torrent, 'retry.torrent');

    await new Promise(r => setTimeout(r, 200));

    expect(callCount).toBeGreaterThan(1);
  });

  it('follows HTTP redirects', async () => {
    const httpMod = require('http');
    let call = 0;
    jest.spyOn(httpMod, 'get').mockImplementation((url, cb) => {
      call++;
      const res = new EventEmitter();
      if (call === 1) {
        res.statusCode = 302;
        res.headers = { location: 'http://cdn.example.com/file.mkv' };
        res.resume = jest.fn();
        setImmediate(() => cb(res));
      } else {
        res.statusCode = 200;
        res.headers = { 'content-length': '5' };
        res.destroy = jest.fn();
        res.pipe = jest.fn((dest) => { setImmediate(() => dest.emit('finish')); return dest; });
        setImmediate(() => cb(res));
      }
      return { on: jest.fn() };
    });
    jest.spyOn(fs, 'createWriteStream').mockReturnValue(
      (() => { const w = new EventEmitter(); w.close = (cb) => cb && cb(); return w; })()
    );

    const { app } = makeApp();
    const torrent = makeTorrentBuf('http://webshare-api:3001/stream/redir');
    await request(app).post('/api/v2/torrents/add').attach('torrents', torrent, 'redir.torrent');
    await new Promise(r => setTimeout(r, 150));

    expect(call).toBe(2); // original + redirected
  });

  it('rejects on too many redirects', async () => {
    const httpMod = require('http');
    jest.spyOn(httpMod, 'get').mockImplementation((url, cb) => {
      const res = new EventEmitter();
      res.statusCode = 301;
      res.headers = { location: url }; // redirect to itself
      res.resume = jest.fn();
      setImmediate(() => cb(res));
      return { on: jest.fn() };
    });

    const { app } = makeApp();
    const torrent = makeTorrentBuf('http://webshare-api:3001/stream/loop');
    await request(app).post('/api/v2/torrents/add').attach('torrents', torrent, 'loop.torrent');
    await new Promise(r => setTimeout(r, 200));

    const { body } = await request(app).get('/api/v2/torrents/info');
    expect(body[0].state).toBe('error');
  });

  it('updates filename from Content-Disposition header', async () => {
    const httpMod = require('http');
    jest.spyOn(httpMod, 'get').mockImplementation((url, cb) => {
      const res = new EventEmitter();
      res.statusCode = 200;
      res.headers = {
        'content-length': '10',
        'content-disposition': 'attachment; filename="renamed.mkv"',
      };
      res.destroy = jest.fn();
      res.pipe = jest.fn((dest) => { setImmediate(() => dest.emit('finish')); return dest; });
      setImmediate(() => cb(res));
      return { on: jest.fn() };
    });
    jest.spyOn(fs, 'createWriteStream').mockReturnValue(
      (() => { const w = new EventEmitter(); w.close = (cb) => cb && cb(); return w; })()
    );

    const { app } = makeApp();
    const torrent = makeTorrentBuf('http://webshare-api:3001/stream/rename');
    await request(app).post('/api/v2/torrents/add').attach('torrents', torrent, 'orig.torrent');
    await new Promise(r => setTimeout(r, 100));

    const { body } = await request(app).get('/api/v2/torrents/info');
    expect(body[0].name).toBe('renamed.mkv');
  });
});