const { describe, it, mock, beforeEach } = require('node:test');
const assert = require('node:assert/strict');
const path = require('path');
const { EventEmitter } = require('events');

// We need to mock fs.statSync and the hoster upload functions before requiring upload-manager
// Use node:test mock.module (available in Node 22+)

describe('UploadManager', () => {
  let UploadManager;
  let mockUploadFile;
  let fakeFileSize;

  beforeEach(() => {
    fakeFileSize = 1024 * 1024; // 1 MB default

    // Clear module cache for fresh mocks each test
    delete require.cache[require.resolve('../lib/upload-manager')];

    // Mock the hosters module
    mockUploadFile = mock.fn(async (hoster, filePath, apiKey, onProgress, signal, throttle) => {
      // Simulate upload progress
      if (onProgress) {
        onProgress(fakeFileSize / 2, fakeFileSize);
        onProgress(fakeFileSize, fakeFileSize);
      }
      return { download_url: `https://${hoster}/test123`, embed_url: null, file_code: 'test123' };
    });

    // Override require for hosters
    const origRequire = module.constructor.prototype.require;
    const hosters = require('../lib/hosters');
    hosters.uploadFile = mockUploadFile;

    // Mock fs.statSync for test file paths
    const fs = require('fs');
    const origStatSync = fs.statSync;
    fs.statSync = function(p) {
      if (typeof p === 'string' && p.startsWith('/test/')) {
        return { size: fakeFileSize };
      }
      return origStatSync.call(this, p);
    };

    UploadManager = require('../lib/upload-manager');
  });

  it('emits progress events for each task', async () => {
    const mgr = new UploadManager({});
    const events = [];
    mgr.on('progress', (data) => events.push(data));

    await mgr.startBatch([
      { file: '/test/video1.mp4', hoster: 'doodstream.com', apiKey: 'key1' }
    ]);

    const statuses = events.map(e => e.status);
    assert.ok(statuses.includes('queued'), 'should have queued status');
    assert.ok(statuses.includes('done'), 'should have done status');
  });

  it('emits batch-done with correct summary', async () => {
    const mgr = new UploadManager({});
    let summary = null;
    mgr.on('batch-done', (s) => { summary = s; });

    await mgr.startBatch([
      { file: '/test/video1.mp4', hoster: 'doodstream.com', apiKey: 'key1' },
      { file: '/test/video2.mp4', hoster: 'doodstream.com', apiKey: 'key1' }
    ]);

    assert.ok(summary);
    assert.equal(summary.total, 2);
    assert.equal(summary.succeeded, 2);
    assert.equal(summary.failed, 0);
    assert.equal(summary.files.length, 2);
  });

  it('retries on failure then succeeds', async () => {
    let callCount = 0;
    mockUploadFile.mock.mockImplementation(async (hoster, filePath, apiKey, onProgress) => {
      callCount++;
      if (callCount <= 2) throw new Error('network error');
      if (onProgress) onProgress(fakeFileSize, fakeFileSize);
      return { download_url: 'https://test/ok', embed_url: null, file_code: 'ok' };
    });

    const mgr = new UploadManager({ 'doodstream.com': { retries: 3, parallelCount: 1, maxSpeedKbs: 0, restartBelowKbs: 0, timeIntervalSec: 0, maxSizeMb: 0 } });
    const statuses = [];
    mgr.on('progress', (d) => statuses.push(d.status));

    await mgr.startBatch([
      { file: '/test/video.mp4', hoster: 'doodstream.com', apiKey: 'key1' }
    ]);

    assert.ok(statuses.includes('retrying'), 'should show retrying status');
    assert.ok(statuses.includes('done'), 'should eventually succeed');
    assert.equal(callCount, 3);
  });

  it('exhausted retries result in error', async () => {
    mockUploadFile.mock.mockImplementation(async () => {
      throw new Error('permanent failure');
    });

    const mgr = new UploadManager({ 'doodstream.com': { retries: 1, parallelCount: 1, maxSpeedKbs: 0, restartBelowKbs: 0, timeIntervalSec: 0, maxSizeMb: 0 } });
    let summary = null;
    mgr.on('batch-done', (s) => { summary = s; });

    await mgr.startBatch([
      { file: '/test/video.mp4', hoster: 'doodstream.com', apiKey: 'key1' }
    ]);

    assert.ok(summary);
    assert.equal(summary.failed, 1);
    assert.equal(summary.succeeded, 0);
  });

  it('cancel aborts running uploads', async () => {
    mockUploadFile.mock.mockImplementation(async (hoster, filePath, apiKey, onProgress, signal) => {
      // Simulate a slow upload
      await new Promise((resolve, reject) => {
        const timer = setTimeout(() => resolve({ download_url: 'x', embed_url: null, file_code: 'x' }), 10000);
        if (signal) signal.addEventListener('abort', () => { clearTimeout(timer); reject(new Error('Aborted')); });
      });
    });

    const mgr = new UploadManager({});
    let batchDone = false;
    mgr.on('batch-done', () => { batchDone = true; });

    const batchPromise = mgr.startBatch([
      { file: '/test/video.mp4', hoster: 'doodstream.com', apiKey: 'key1' }
    ]);

    // Wait a bit then cancel
    await new Promise(r => setTimeout(r, 100));
    mgr.cancel();

    await batchPromise;
    assert.equal(mgr.running, false);
    assert.ok(batchDone, 'batch-done should be emitted even after cancel');
  });

  it('maxSizeMb filter skips oversized files', async () => {
    fakeFileSize = 5 * 1024 * 1024; // 5 MB

    const mgr = new UploadManager({ 'doodstream.com': { retries: 0, parallelCount: 1, maxSpeedKbs: 0, restartBelowKbs: 0, timeIntervalSec: 0, maxSizeMb: 1 } });
    const statuses = [];
    mgr.on('progress', (d) => statuses.push(d.status));

    await mgr.startBatch([
      { file: '/test/big.mp4', hoster: 'doodstream.com', apiKey: 'key1' }
    ]);

    assert.ok(statuses.includes('skipped'), 'oversized file should be skipped');
    assert.ok(!statuses.includes('uploading'), 'should not attempt upload');
  });

  it('per-hoster semaphore limits concurrency', async () => {
    let concurrent = 0;
    let maxConcurrent = 0;

    mockUploadFile.mock.mockImplementation(async (hoster, filePath, apiKey, onProgress, signal) => {
      concurrent++;
      maxConcurrent = Math.max(maxConcurrent, concurrent);
      await new Promise(r => setTimeout(r, 50));
      concurrent--;
      if (onProgress) onProgress(fakeFileSize, fakeFileSize);
      return { download_url: 'https://test/ok', embed_url: null, file_code: 'ok' };
    });

    const mgr = new UploadManager({ 'doodstream.com': { retries: 0, parallelCount: 1, maxSpeedKbs: 0, restartBelowKbs: 0, timeIntervalSec: 0, maxSizeMb: 0 } });

    await mgr.startBatch([
      { file: '/test/a.mp4', hoster: 'doodstream.com', apiKey: 'k' },
      { file: '/test/b.mp4', hoster: 'doodstream.com', apiKey: 'k' },
      { file: '/test/c.mp4', hoster: 'doodstream.com', apiKey: 'k' }
    ]);

    assert.equal(maxConcurrent, 1, 'should only run 1 upload at a time');
  });

  it('global parallel limit caps concurrency across hosters', async () => {
    let concurrent = 0;
    let maxConcurrent = 0;

    mockUploadFile.mock.mockImplementation(async (hoster, filePath, apiKey, onProgress) => {
      concurrent++;
      maxConcurrent = Math.max(maxConcurrent, concurrent);
      await new Promise((resolve) => setTimeout(resolve, 40));
      concurrent--;
      if (onProgress) onProgress(fakeFileSize, fakeFileSize);
      return { download_url: `https://${hoster}/ok`, embed_url: null, file_code: 'ok' };
    });

    const mgr = new UploadManager({
      'doodstream.com': { retries: 0, parallelCount: 5, maxSpeedKbs: 0, restartBelowKbs: 0, timeIntervalSec: 0, maxSizeMb: 0 },
      'voe.sx': { retries: 0, parallelCount: 5, maxSpeedKbs: 0, restartBelowKbs: 0, timeIntervalSec: 0, maxSizeMb: 0 },
      'vidmoly.me': { retries: 0, parallelCount: 5, maxSpeedKbs: 0, restartBelowKbs: 0, timeIntervalSec: 0, maxSizeMb: 0 }
    }, {
      parallelUploadCount: 2,
      scaleParallelUploads: true
    });

    await mgr.startBatch([
      { jobId: 'job-1', file: '/test/a.mp4', hoster: 'doodstream.com', apiKey: 'k' },
      { jobId: 'job-2', file: '/test/b.mp4', hoster: 'voe.sx', apiKey: 'k' },
      { jobId: 'job-3', file: '/test/c.mp4', hoster: 'vidmoly.me', apiKey: 'k' }
    ]);

    assert.equal(maxConcurrent, 2, 'should only run 2 uploads globally at once');
  });

  it('cancelJobs aborts a selected running upload', async () => {
    mockUploadFile.mock.mockImplementation(async (hoster, filePath, apiKey, onProgress, signal) => {
      await new Promise((resolve, reject) => {
        const timer = setTimeout(() => resolve(), 250);
        if (signal) {
          signal.addEventListener('abort', () => {
            clearTimeout(timer);
            reject(new Error('Aborted'));
          }, { once: true });
        }
      });
      if (onProgress) onProgress(fakeFileSize, fakeFileSize);
      return { download_url: 'https://test/ok', embed_url: null, file_code: 'ok' };
    });

    const mgr = new UploadManager({});
    const statuses = [];
    mgr.on('progress', (data) => statuses.push({ jobId: data.jobId, status: data.status }));

    const batchPromise = mgr.startBatch([
      { jobId: 'selected-job', file: '/test/video.mp4', hoster: 'doodstream.com', apiKey: 'key1' }
    ]);

    await new Promise((resolve) => setTimeout(resolve, 50));
    mgr.cancelJobs(['selected-job']);

    await batchPromise;
    assert.ok(statuses.some((entry) => entry.jobId === 'selected-job' && entry.status === 'aborted'));
  });

  it('addJobs returns duplicate info and still runs newly queued jobs', async () => {
    let releaseFirst = null;

    mockUploadFile.mock.mockImplementation(async (hoster, filePath, apiKey, onProgress, signal) => {
      if (filePath.endsWith('/first.mp4')) {
        await new Promise((resolve, reject) => {
          releaseFirst = resolve;
          if (signal) {
            signal.addEventListener('abort', () => reject(new Error('Aborted')), { once: true });
          }
        });
      } else {
        await new Promise((resolve) => setTimeout(resolve, 20));
      }
      if (onProgress) onProgress(fakeFileSize, fakeFileSize);
      return { download_url: 'https://test/ok', embed_url: null, file_code: 'ok' };
    });

    const mgr = new UploadManager({
      'doodstream.com': { retries: 0, parallelCount: 1, maxSpeedKbs: 0, restartBelowKbs: 0, timeIntervalSec: 0, maxSizeMb: 0 }
    });
    const statuses = [];
    mgr.on('progress', (data) => statuses.push({ jobId: data.jobId, status: data.status }));

    const batchPromise = mgr.startBatch([
      { jobId: 'job-first', file: '/test/first.mp4', hoster: 'doodstream.com', apiKey: 'key1' }
    ]);

    for (let i = 0; i < 50 && !releaseFirst; i++) {
      await new Promise((resolve) => setTimeout(resolve, 10));
    }
    assert.equal(typeof releaseFirst, 'function', 'first job should be running before addJobs');

    const addResult = mgr.addJobs([
      { jobId: 'job-first', file: '/test/first.mp4', hoster: 'doodstream.com', apiKey: 'key1' },
      { jobId: 'job-second', file: '/test/second.mp4', hoster: 'doodstream.com', apiKey: 'key1' },
      { jobId: 'job-third', file: '/test/third.mp4', hoster: 'doodstream.com', apiKey: 'key1' }
    ]);

    assert.equal(addResult.added, 2);
    assert.deepEqual(addResult.alreadyInBatchJobIds, ['job-first']);

    releaseFirst();
    await batchPromise;

    assert.ok(statuses.some((entry) => entry.jobId === 'job-second' && entry.status === 'done'));
    assert.ok(statuses.some((entry) => entry.jobId === 'job-third' && entry.status === 'done'));
  });

  it('_combineSignals propagates abort from either source', () => {
    const mgr = new UploadManager({});
    const ac1 = new AbortController();
    const ac2 = new AbortController();

    const { signal, cleanup } = mgr._combineSignals(ac1.signal, ac2.signal);
    assert.equal(signal.aborted, false);

    ac2.abort();
    assert.equal(signal.aborted, true);
    cleanup();
  });

  it('_combineSignals returns aborted signal if input already aborted', () => {
    const mgr = new UploadManager({});
    const ac1 = new AbortController();
    ac1.abort();
    const ac2 = new AbortController();

    const { signal, cleanup } = mgr._combineSignals(ac1.signal, ac2.signal);
    assert.equal(signal.aborted, true);
    cleanup();
  });

  it('_sleep resolves after delay', async () => {
    const mgr = new UploadManager({});
    const start = Date.now();
    await mgr._sleep(100);
    assert.ok(Date.now() - start >= 90);
  });

  it('_sleep rejects on abort', async () => {
    const mgr = new UploadManager({});
    const ac = new AbortController();
    setTimeout(() => ac.abort(), 10);
    await assert.rejects(mgr._sleep(5000, ac.signal), /Aborted/);
  });

  it('file not found produces descriptive error', async () => {
    // Override fs.statSync to throw ENOENT for a specific path
    const fs = require('fs');
    const origStat = fs.statSync;
    fs.statSync = function(p) {
      if (p === '/test/deleted.mp4') throw Object.assign(new Error('ENOENT'), { code: 'ENOENT' });
      return origStat.call(this, p);
    };

    const mgr = new UploadManager({});
    const errors = [];
    mgr.on('progress', (d) => { if (d.error) errors.push(d.error); });

    await mgr.startBatch([
      { file: '/test/deleted.mp4', hoster: 'doodstream.com', apiKey: 'key1' }
    ]);

    fs.statSync = origStat;
    assert.ok(errors.some(e => e.includes('nicht gefunden')), `expected "nicht gefunden" error, got: ${errors.join(', ')}`);
  });

  it('zero-byte file produces descriptive error', async () => {
    fakeFileSize = 0;

    const mgr = new UploadManager({});
    const errors = [];
    mgr.on('progress', (d) => { if (d.error) errors.push(d.error); });

    await mgr.startBatch([
      { file: '/test/empty.mp4', hoster: 'doodstream.com', apiKey: 'key1' }
    ]);

    assert.ok(errors.some(e => e.includes('0 Bytes')), `expected "0 Bytes" error, got: ${errors.join(', ')}`);
  });

  it('empty batch completes immediately with zero counts', async () => {
    const mgr = new UploadManager({});
    let summary = null;
    mgr.on('batch-done', (s) => { summary = s; });

    const start = Date.now();
    await mgr.startBatch([]);
    const elapsed = Date.now() - start;

    assert.ok(summary, 'batch-done should be emitted');
    assert.equal(summary.total, 0);
    assert.equal(summary.succeeded, 0);
    assert.equal(summary.failed, 0);
    assert.ok(elapsed < 200, `empty batch should complete fast, took ${elapsed}ms`);
  });

  it('scaleParallelUploads limits per-hoster count to global limit', async () => {
    let concurrent = 0;
    let maxConcurrent = 0;

    mockUploadFile.mock.mockImplementation(async (hoster, filePath, apiKey, onProgress) => {
      concurrent++;
      maxConcurrent = Math.max(maxConcurrent, concurrent);
      await new Promise(r => setTimeout(r, 40));
      concurrent--;
      if (onProgress) onProgress(fakeFileSize, fakeFileSize);
      return { download_url: 'ok', embed_url: null, file_code: 'ok' };
    });

    const mgr = new UploadManager(
      { 'doodstream.com': { retries: 0, parallelCount: 10, maxSpeedKbs: 0, restartBelowKbs: 0, timeIntervalSec: 0, maxSizeMb: 0 } },
      { parallelUploadCount: 2, scaleParallelUploads: true }
    );

    await mgr.startBatch([
      { file: '/test/a.mp4', hoster: 'doodstream.com', apiKey: 'k' },
      { file: '/test/b.mp4', hoster: 'doodstream.com', apiKey: 'k' },
      { file: '/test/c.mp4', hoster: 'doodstream.com', apiKey: 'k' },
      { file: '/test/d.mp4', hoster: 'doodstream.com', apiKey: 'k' },
      { file: '/test/e.mp4', hoster: 'doodstream.com', apiKey: 'k' }
    ]);

    assert.ok(maxConcurrent <= 2, `scaleParallelUploads should cap at 2, was ${maxConcurrent}`);
  });

  it('addJobs injects new tasks into running batch', async () => {
    let started = 0;
    mockUploadFile.mock.mockImplementation(async (hoster, filePath, apiKey, onProgress) => {
      started++;
      await new Promise(r => setTimeout(r, 100));
      if (onProgress) onProgress(fakeFileSize, fakeFileSize);
      return { download_url: 'ok', embed_url: null, file_code: 'ok' };
    });

    const mgr = new UploadManager({});
    let summary = null;
    mgr.on('batch-done', (s) => { summary = s; });

    // Start batch with 2 tasks
    const batchPromise = mgr.startBatch([
      { jobId: 'job-1', file: '/test/a.mp4', hoster: 'doodstream.com', apiKey: 'k' },
      { jobId: 'job-2', file: '/test/b.mp4', hoster: 'doodstream.com', apiKey: 'k' }
    ]);

    // After 30ms (during upload), inject 2 more tasks
    await new Promise(r => setTimeout(r, 30));
    const result = mgr.addJobs([
      { jobId: 'job-3', file: '/test/c.mp4', hoster: 'doodstream.com', apiKey: 'k' },
      { jobId: 'job-4', file: '/test/d.mp4', hoster: 'doodstream.com', apiKey: 'k' }
    ]);
    assert.equal(result.added, 2, 'should add 2 new jobs');
    assert.equal(result.alreadyInBatchJobIds.length, 0);

    await batchPromise;
    assert.ok(summary);
    assert.equal(started, 4, 'all 4 jobs should have run');
  });

  it('addJobs rejects duplicates already in running batch', async () => {
    mockUploadFile.mock.mockImplementation(async (hoster, filePath, apiKey, onProgress, signal) => {
      // Slow upload so we can add jobs while it's running
      await new Promise((resolve, reject) => {
        const timer = setTimeout(resolve, 200);
        if (signal) signal.addEventListener('abort', () => { clearTimeout(timer); reject(new Error('Aborted')); });
      });
      if (onProgress) onProgress(fakeFileSize, fakeFileSize);
      return { download_url: 'ok', embed_url: null, file_code: 'ok' };
    });

    const mgr = new UploadManager({});
    const batchPromise = mgr.startBatch([
      { jobId: 'job-A', file: '/test/x.mp4', hoster: 'doodstream.com', apiKey: 'k' }
    ]);

    // Try to add the SAME jobId while it's running
    await new Promise(r => setTimeout(r, 50));
    const result = mgr.addJobs([
      { jobId: 'job-A', file: '/test/x.mp4', hoster: 'doodstream.com', apiKey: 'k' },
      { jobId: 'job-B', file: '/test/y.mp4', hoster: 'doodstream.com', apiKey: 'k' }
    ]);
    assert.equal(result.added, 1, 'should skip duplicate jobId, add only the new one');
    assert.deepEqual(result.alreadyInBatchJobIds, ['job-A']);

    await batchPromise;
  });

  it('addJobs returns added=0 when not running', () => {
    const mgr = new UploadManager({});
    const result = mgr.addJobs([
      { jobId: 'job-1', file: '/test/a.mp4', hoster: 'doodstream.com', apiKey: 'k' }
    ]);
    assert.equal(result.added, 0);
  });

  it('stats event contains expected fields', async () => {
    // Make upload take long enough for stats interval to fire
    mockUploadFile.mock.mockImplementation(async (hoster, filePath, apiKey, onProgress, signal) => {
      await new Promise(r => setTimeout(r, 1500));
      if (onProgress) onProgress(fakeFileSize, fakeFileSize);
      return { download_url: 'https://test/ok', embed_url: null, file_code: 'ok' };
    });

    const mgr = new UploadManager({});
    const statsEvents = [];
    mgr.on('stats', (d) => statsEvents.push(d));

    await mgr.startBatch([
      { file: '/test/video.mp4', hoster: 'doodstream.com', apiKey: 'key1' }
    ]);

    assert.ok(statsEvents.length > 0, 'should have received stats events');
    const stat = statsEvents[0];
    assert.ok('globalSpeedKbs' in stat);
    assert.ok('totalBytes' in stat);
    assert.ok('elapsed' in stat);
    assert.ok('activeJobs' in stat);
  });

  describe('error classification', () => {
    it('treats "not enough disk space" as account-level, not file-rejected', () => {
      const mgr = new UploadManager({});
      // Shape matches what lib/hosters.js attaches for byse account-storage-full
      const err = new Error('Byse lehnte Datei ab: 0:0:0:not enough disk space on your account');
      err.accountError = true;
      assert.equal(mgr._isFileRejectedError(err), false,
        'account-level error must NOT be classified as file-rejected');
      assert.equal(mgr._shouldSkipRetryOnAccountError(err), true,
        'account-storage-full must trigger account rotation');
    });

    it('classifies disk-space errors by message alone (safety net)', () => {
      const mgr = new UploadManager({});
      const err = new Error('Byse lehnte Datei ab: not enough disk space');
      // No flag set — regex alone must catch it.
      assert.equal(mgr._shouldSkipRetryOnAccountError(err), true);
      assert.equal(mgr._isFileRejectedError(err), false,
        'must not match generic "lehnte Datei ab" as file-rejected');
    });

    it('keeps true file rejections as file-rejected', () => {
      const mgr = new UploadManager({});
      const err = new Error('Byse lehnte Datei ab: Duplicate');
      err.fileRejected = true;
      assert.equal(mgr._isFileRejectedError(err), true);
      assert.equal(mgr._shouldSkipRetryOnAccountError(err), false);
    });

    it('file-rejected regex still matches known phrases without flag', () => {
      const mgr = new UploadManager({});
      for (const msg of [
        'Not video file format',
        'Duplicate',
        'Datei zu klein',
        'File too large',
        'Invalid file'
      ]) {
        assert.equal(mgr._isFileRejectedError(new Error(msg)), true, `should match: ${msg}`);
      }
    });

    it('accountError flag beats fileRejected if both set (defensive)', () => {
      const mgr = new UploadManager({});
      const err = new Error('weird');
      err.fileRejected = true;
      err.accountError = true;
      assert.equal(mgr._isFileRejectedError(err), false,
        'account-level always wins — rotation must happen');
      assert.equal(mgr._shouldSkipRetryOnAccountError(err), true);
    });
  });

  describe('session-level account memory', () => {
    // Scenario: user has 2 byse accounts. Account 1 is full ("not enough
    // disk space"). First job fails on acc1 → rotation to acc2. Second job
    // must NOT re-probe acc1; pre-job-swap has to kick in.
    it('after account is marked failed, next job swaps straight to override without retrying acc1', async () => {
      // Only acc1 throws disk-space; acc2 succeeds. Mock decides by apiKey.
      mockUploadFile.mock.mockImplementation(async (hoster, filePath, apiKey, onProgress) => {
        if (apiKey === 'acc1-key') {
          const err = new Error('Byse lehnte Datei ab: 0:0:0:not enough disk space on your account');
          err.accountError = true;
          throw err;
        }
        if (onProgress) onProgress(fakeFileSize, fakeFileSize);
        return { download_url: 'https://byse.sx/ok', embed_url: null, file_code: 'ok' };
      });

      const mgr = new UploadManager(
        { 'byse.sx': { retries: 3, parallelCount: 1, maxSpeedKbs: 0, restartBelowKbs: 0, timeIntervalSec: 0, maxSizeMb: 0 } }
      );

      // Simulate main.js: on account-failed, resolve fallback → switchAccount
      mgr.on('account-failed', ({ hoster, accountId }) => {
        mgr.switchAccount(hoster, { id: 'acc2', username: 'u2', password: 'p2', apiKey: 'acc2-key' });
      });

      const rotEvents = [];
      mgr.on('rot-log', (e) => rotEvents.push(e));
      const progress = [];
      mgr.on('progress', (d) => progress.push({ fileName: d.fileName, status: d.status, error: d.error }));

      await mgr.startBatch([
        { file: '/test/a.mp4', hoster: 'byse.sx', apiKey: 'acc1-key', accountId: 'acc1', username: 'u1', password: 'p1' },
        { file: '/test/b.mp4', hoster: 'byse.sx', apiKey: 'acc1-key', accountId: 'acc1', username: 'u1', password: 'p1' }
      ]);

      // Event sequence we expect:
      //  - job A: fast-fail on acc1 → mark-failed → switchAccount → rotate → upload with acc2 → done
      //  - job B: pre-job-swap from acc1 → acc2 (no attempts on acc1!) → done
      const events = rotEvents.map(e => e.event);
      assert.ok(events.includes('fast-fail'), `expected fast-fail, got: ${events.join(',')}`);
      assert.ok(events.includes('mark-failed'), `expected mark-failed, got: ${events.join(',')}`);
      assert.ok(events.includes('switchAccount'), `expected switchAccount, got: ${events.join(',')}`);
      assert.ok(events.includes('pre-job-swap'), `expected pre-job-swap for 2nd job, got: ${events.join(',')}`);

      // job B's pre-job-swap MUST predate any upload attempt for /test/b.mp4.
      // If acc1 was probed for B, the mock would have thrown and we'd see
      // another fast-fail or retrying event for b.mp4.
      const bProgressErrors = progress
        .filter(p => p.fileName && p.fileName.includes('b.mp4') && p.error)
        .map(p => p.error);
      assert.equal(bProgressErrors.length, 0,
        `job B should never have touched acc1; got errors: ${bProgressErrors.join(' | ')}`);

      // Both jobs should be done at the end.
      const doneFiles = progress.filter(p => p.status === 'done').map(p => p.fileName);
      assert.ok(doneFiles.some(f => f && f.includes('a.mp4')), 'a.mp4 should finish via rotation');
      assert.ok(doneFiles.some(f => f && f.includes('b.mp4')), 'b.mp4 should finish via pre-job-swap');

      // Sanity: mock was called with acc2-key more often than acc1-key.
      const byKey = { acc1: 0, acc2: 0 };
      for (const call of mockUploadFile.mock.calls) {
        if (call.arguments[2] === 'acc1-key') byKey.acc1++;
        else if (call.arguments[2] === 'acc2-key') byKey.acc2++;
      }
      assert.ok(byKey.acc1 <= 1, `acc1 should only be tried once (for job A); got ${byKey.acc1}`);
      assert.ok(byKey.acc2 >= 2, `acc2 should handle both jobs after rotation; got ${byKey.acc2}`);
    });

    it('on fresh UploadManager (simulates app restart), failed-account memory is gone', () => {
      const mgr1 = new UploadManager({});
      mgr1._failedAccounts.set('byse.sx:acc1', true);
      mgr1.switchAccount('byse.sx', { id: 'acc2' });
      assert.equal(mgr1._failedAccounts.size, 1);
      assert.equal(mgr1._accountOverrides.size, 1);

      const mgr2 = new UploadManager({});
      assert.equal(mgr2._failedAccounts.size, 0, 'new manager must start clean');
      assert.equal(mgr2._accountOverrides.size, 0, 'override map must be empty on fresh manager');
    });

    it('exposes failed-account introspection (for main.js mid-batch re-resolve)', () => {
      const mgr = new UploadManager({});
      assert.deepEqual(mgr.getFailedAccountKeys(), []);
      assert.equal(mgr.getOverride('byse.sx'), null);

      mgr._failedAccounts.set('byse.sx:acc1', true);
      mgr._failedAccounts.set('voe.sx:other', true);
      assert.deepEqual(mgr.getFailedAccountKeys().sort(), ['byse.sx:acc1', 'voe.sx:other']);
      assert.equal(mgr.getOverride('byse.sx'), null, 'no override yet');

      mgr.switchAccount('byse.sx', { id: 'acc2', apiKey: 'k2' });
      assert.equal(mgr.getOverride('byse.sx').id, 'acc2');
      assert.equal(mgr.getOverride('voe.sx'), null, 'unrelated hoster still has no override');
    });

    it('late-resolved override is honored by subsequent jobs (simulates mid-batch config add)', async () => {
      // Only acc1 throws; acc2 succeeds.
      mockUploadFile.mock.mockImplementation(async (hoster, filePath, apiKey, onProgress) => {
        if (apiKey === 'acc1-key') {
          const err = new Error('Byse lehnte Datei ab: not enough disk space');
          err.accountError = true;
          throw err;
        }
        if (onProgress) onProgress(fakeFileSize, fakeFileSize);
        return { download_url: 'ok', embed_url: null, file_code: 'ok' };
      });

      const mgr = new UploadManager(
        { 'byse.sx': { retries: 1, parallelCount: 1, maxSpeedKbs: 0, restartBelowKbs: 0, timeIntervalSec: 0, maxSizeMb: 0 } }
      );

      // Scenario: initially config has ONLY acc1. No account-failed listener
      // resolves a fallback (because none exists in config yet). Job A fails
      // with rotation-end.
      const rotEvents = [];
      mgr.on('rot-log', (e) => rotEvents.push(e));

      await mgr.startBatch([
        { file: '/test/a.mp4', hoster: 'byse.sx', apiKey: 'acc1-key', accountId: 'acc1', username: 'u1', password: 'p1' }
      ]);

      // Job A should have ended with rotation-end (no fallback available).
      const eventsA = rotEvents.map(e => e.event);
      assert.ok(eventsA.includes('mark-failed'), 'acc1 must be marked failed');
      assert.ok(eventsA.includes('rotation-end'), 'expected rotation-end without a fallback');
      assert.equal(mgr.getFailedAccountKeys().length, 1);
      assert.equal(mgr.getOverride('byse.sx'), null, 'no override set during first batch');

      // --- Simulate: user adds acc2 in Settings → save-config handler finds
      // that byse.sx:acc1 is failed without an override → resolves + switches.
      mgr.switchAccount('byse.sx', { id: 'acc2', username: 'u2', password: 'p2', apiKey: 'acc2-key' });

      // Now a follow-up batch (same running session — in production, addJobs
      // or a new startBatch without clearing maps would reach this state).
      // We need to ALSO clear _failedAccounts manually here because startBatch
      // resets it — so we poke the inner state to emulate "still mid-batch
      // with late config". The switchAccount-after-fail path is what matters.
      rotEvents.length = 0;
      // Re-run just the _runJob path by manually setting up state and using
      // addJobs — simulates mid-batch job add after config change.
      mgr.running = true;
      mgr._batchResults = new Map();
      mgr._batchResults.set('/test/b.mp4', { name: 'b.mp4', size: fakeFileSize, results: [] });
      mgr._failedAccounts.set('byse.sx:acc1', true); // re-establish failed state
      mgr._additionalPromises = [];

      // Spawn a new job through addJobs() path (uses _runJob internally)
      const addResult = await mgr.addJobs([
        { file: '/test/b.mp4', hoster: 'byse.sx', apiKey: 'acc1-key', accountId: 'acc1', username: 'u1', password: 'p1', jobId: 'jb' }
      ]);
      assert.ok(addResult.added >= 1 || addResult.alreadyInBatch === 0,
        `addJobs should accept new job: ${JSON.stringify(addResult)}`);
      await Promise.allSettled(mgr._additionalPromises);

      const eventsB = rotEvents.map(e => e.event);
      assert.ok(eventsB.includes('pre-job-swap'),
        `job B should have pre-job-swap after late override was set; got: ${eventsB.join(',')}`);

      // Mock must have been called with acc2-key for the new job (not acc1-key again)
      const acc1ForB = mockUploadFile.mock.calls.filter(c =>
        c.arguments[1] === '/test/b.mp4' && c.arguments[2] === 'acc1-key').length;
      assert.equal(acc1ForB, 0, 'job B must never touch acc1-key after late fallback was set');
    });
  });
});