const { describe, it, beforeEach, afterEach } = require('node:test');
const assert = require('node:assert/strict');
const fs = require('fs');
const path = require('path');
const os = require('os');
const ConfigStore = require('../lib/config-store');

let tmpDir;
let store;

function createStore() {
  const fakeApp = {
    isPackaged: false,
    getPath: () => tmpDir
  };
  // ConfigStore uses path.join(__dirname, '..') for non-packaged
  // We override by setting filePath directly
  store = new ConfigStore(fakeApp);
  store.filePath = path.join(tmpDir, 'electron-config.json');
  return store;
}

describe('ConfigStore', () => {
  beforeEach(() => {
    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'cfg-test-'));
    store = createStore();
  });

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

  it('load returns defaults when file does not exist', () => {
    const config = store.load();
    assert.ok(config.hosters);
    assert.ok(config.hosters['doodstream.com']);
    assert.ok(config.hosters['voe.sx']);
    assert.ok(config.hosters['vidmoly.me']);
    assert.ok(config.hosters['byse.sx']);
    assert.ok(config.hosterSettings);
    assert.equal(config.hosterSettings['doodstream.com'].retries, 3);
    assert.equal(config.hosterSettings['doodstream.com'].parallelCount, 2);
    assert.equal(config.globalSettings.alwaysOnTop, false);
    assert.equal(config.globalSettings.shutdownAfterFinish, 'nothing');
    assert.equal(config.globalSettings.logFilePath, '');
    assert.equal(config.globalSettings.resumeQueueOnLaunch, true);
    assert.equal(config.globalSettings.parallelUploadCount, 0);
    assert.equal(config.globalSettings.scaleParallelUploads, false);
    assert.equal(config.globalSettings.pendingQueue, null);
    assert.deepEqual(config.history, []);
  });

  it('save then load round-trips', async () => {
    await store.save({ hosters: { 'doodstream.com': [{ id: 'test-1', enabled: true, authType: 'api', apiKey: 'test-key-123' }] } });
    const config = store.load();
    assert.equal(config.hosters['doodstream.com'][0].apiKey, 'test-key-123');
  });

  it('default logMode is "single"', () => {
    const config = store.load();
    assert.equal(config.globalSettings.logMode, 'single');
  });

  it('persists pendingQueue incl. savedAt (number) and ts-bearing jobs across save/load', async () => {
    // The queue-persistence fix stamps pendingQueue.savedAt and restores it on launch.
    // This proves the persistence layer round-trips the new fields untouched (the
    // ts-gate is worthless if savedAt does not survive serialization).
    const pendingQueue = {
      savedAt: 1750000000123,
      selectedUploadHosters: ['voe.sx', 'byse.sx'],
      selectedFiles: [{ path: 'C:/dl/a.mkv', name: 'a.mkv', size: 4242 }],
      queueJobs: [
        { id: 'j1', file: 'C:/dl/a.mkv', fileName: 'a.mkv', hoster: 'voe.sx', status: 'preview', bytesTotal: 4242, maxAttempts: 0 },
        { id: 'j2', file: 'C:/dl/a.mkv', fileName: 'a.mkv', hoster: 'byse.sx', status: 'error', error: 'boom', maxAttempts: 3 }
      ]
    };
    const current = store.load();
    await store.save({ globalSettings: { ...current.globalSettings, pendingQueue } });
    const loaded = store.load();
    const pq = loaded.globalSettings.pendingQueue;
    assert.equal(pq.savedAt, 1750000000123, 'savedAt epoch survives JSON round-trip');
    assert.equal(typeof pq.savedAt, 'number');
    assert.equal(pq.queueJobs.length, 2);
    assert.equal(pq.queueJobs[0].fileName, 'a.mkv');
    assert.equal(pq.queueJobs[0].hoster, 'voe.sx');
    assert.equal(pq.queueJobs[1].status, 'error');
    assert.deepEqual(pq.selectedUploadHosters, ['voe.sx', 'byse.sx']);
    assert.equal(pq.selectedFiles[0].path, 'C:/dl/a.mkv');
  });

  it('pendingQueue can be cleared back to null (clearPersistedQueueStateSoon path)', async () => {
    const current = store.load();
    await store.save({ globalSettings: { ...current.globalSettings, pendingQueue: { savedAt: 1, queueJobs: [] } } });
    assert.ok(store.load().globalSettings.pendingQueue);
    const c2 = store.load();
    await store.save({ globalSettings: { ...c2.globalSettings, pendingQueue: null } });
    assert.equal(store.load().globalSettings.pendingQueue, null);
  });

  it('regression: legacy sessionLog:true on disk normalizes to logMode "daily" (NOT "session")', async () => {
    // Write a config with the legacy boolean only (what an existing user has).
    await store.save({ globalSettings: { sessionLog: true } });
    const config = store.load();
    // The misnamed legacy field MUST map to daily — mapping to "session" would
    // silently change every per-day user's behaviour on upgrade.
    assert.equal(config.globalSettings.logMode, 'daily');
  });

  it('logMode round-trips for all three values', async () => {
    for (const mode of ['single', 'daily', 'session']) {
      await store.save({ globalSettings: { logMode: mode } });
      const config = store.load();
      assert.equal(config.globalSettings.logMode, mode, `mode ${mode}`);
    }
  });

  it('load merges with defaults for missing hosters', () => {
    // Write partial config in old single-object format (triggers migration)
    fs.writeFileSync(store.filePath, JSON.stringify({
      hosters: { 'doodstream.com': { apiKey: 'abc' } }
    }), 'utf-8');

    const config = store.load();
    // Old format is migrated to array
    assert.ok(Array.isArray(config.hosters['doodstream.com']));
    assert.equal(config.hosters['doodstream.com'][0].apiKey, 'abc');
    // Other hosters should still have defaults (empty arrays)
    assert.ok(Array.isArray(config.hosters['voe.sx']));
    assert.equal(config.hosters['voe.sx'].length, 0);
  });

  it('hosterSettings merge fills gaps with defaults', () => {
    fs.writeFileSync(store.filePath, JSON.stringify({
      hosterSettings: { 'voe.sx': { retries: 5 } }
    }), 'utf-8');

    const config = store.load();
    assert.equal(config.hosterSettings['voe.sx'].retries, 5);
    assert.equal(config.hosterSettings['voe.sx'].parallelCount, 2); // default
    assert.equal(config.hosterSettings['voe.sx'].maxSpeedKbs, 0); // default
    assert.equal(config.hosterSettings['voe.sx'].logToFile, true); // default on
  });

  it('logToFile defaults to true for every hoster', () => {
    const config = store.load();
    for (const name of ['doodstream.com', 'voe.sx', 'vidmoly.me', 'byse.sx', 'clouddrop.cc']) {
      assert.equal(config.hosterSettings[name].logToFile, true, `${name} should default logToFile=true`);
    }
  });

  it('sizeMemoEnabled defaults to true for every hoster and persists when disabled', async () => {
    const fresh = store.load();
    for (const name of ['doodstream.com', 'voe.sx', 'vidmoly.me', 'byse.sx', 'clouddrop.cc']) {
      assert.equal(fresh.hosterSettings[name].sizeMemoEnabled, true, `${name} should default sizeMemoEnabled=true`);
    }
    await store.save({ hosterSettings: { 'byse.sx': { sizeMemoEnabled: false } } });
    const config = store.load();
    assert.equal(config.hosterSettings['byse.sx'].sizeMemoEnabled, false, 'explicit false preserved');
    assert.equal(config.hosterSettings['voe.sx'].sizeMemoEnabled, true, 'other hoster still defaults on');
  });

  it('logToFile=false persists and survives reload', async () => {
    await store.save({ hosterSettings: { 'voe.sx': { logToFile: false } } });
    const config = store.load();
    assert.equal(config.hosterSettings['voe.sx'].logToFile, false, 'explicit false preserved');
    assert.equal(config.hosterSettings['byse.sx'].logToFile, true, 'other hoster still defaults on');
  });

  it('save only updates provided sections', async () => {
    // Save hoster settings first
    await store.save({ hosterSettings: { 'doodstream.com': { retries: 10, maxSpeedKbs: 0, parallelCount: 2, restartBelowKbs: 0, timeIntervalSec: 0, maxSizeMb: 0 } } });
    // Save hosters credentials separately (array format)
    await store.save({ hosters: { 'doodstream.com': [{ id: 'test-1', enabled: true, authType: 'api', apiKey: 'key123' }] } });

    const config = store.load();
    assert.equal(config.hosters['doodstream.com'][0].apiKey, 'key123');
    assert.equal(config.hosterSettings['doodstream.com'].retries, 10); // preserved
  });

  it('appendHistory keeps complete history without truncation', async () => {
    for (let i = 0; i < 105; i++) {
      await store.appendHistory({ id: `batch-${i}`, timestamp: new Date().toISOString(), files: [] });
    }
    const history = store.loadHistory();
    assert.equal(history.length, 105);
    assert.equal(history[0].id, 'batch-0');
    assert.equal(history[104].id, 'batch-104');
  });

  it('clearHistory empties the array', async () => {
    await store.appendHistory({ id: 'test', files: [] });
    assert.equal(store.loadHistory().length, 1);
    await store.clearHistory();
    assert.equal(store.loadHistory().length, 0);
  });

  it('rotationCursors default to an empty object', () => {
    const config = store.load();
    assert.deepEqual(config.rotationCursors, {});
  });

  it('saveRotationCursors round-trips and survives reload', async () => {
    await store.saveRotationCursors({ 'byse.sx': 7, 'voe.sx': 2 });
    const config = store.load();
    assert.equal(config.rotationCursors['byse.sx'], 7);
    assert.equal(config.rotationCursors['voe.sx'], 2);
  });

  it('an unrelated save() does not clobber persisted rotationCursors', async () => {
    await store.saveRotationCursors({ 'byse.sx': 3 });
    await store.save({ globalSettings: { alwaysOnTop: true } });
    const config = store.load();
    assert.equal(config.rotationCursors['byse.sx'], 3, 'cursor preserved across a settings save');
    assert.equal(config.globalSettings.alwaysOnTop, true);
  });

  it('saveRotationCursors does not disturb credentials', async () => {
    await store.save({ hosters: { 'byse.sx': [{ id: 'k1', enabled: true, authType: 'api', apiKey: 'secret-key' }] } });
    await store.saveRotationCursors({ 'byse.sx': 1 });
    const config = store.load();
    assert.equal(config.hosters['byse.sx'][0].apiKey, 'secret-key');
    assert.equal(config.rotationCursors['byse.sx'], 1);
  });

  it('corrupted JSON falls back to defaults', () => {
    fs.writeFileSync(store.filePath, '{invalid json!!!', 'utf-8');
    const config = store.load();
    assert.ok(config.hosters);
    assert.ok(config.hosterSettings);
    assert.deepEqual(config.history, []);
  });

  it('globalSettings merge preserves partial values', () => {
    fs.writeFileSync(store.filePath, JSON.stringify({
      globalSettings: { alwaysOnTop: true }
    }), 'utf-8');

    const config = store.load();
    assert.equal(config.globalSettings.alwaysOnTop, true);
    assert.equal(config.globalSettings.shutdownAfterFinish, 'nothing'); // default
    assert.equal(config.globalSettings.resumeQueueOnLaunch, true);
    assert.equal(config.globalSettings.parallelUploadCount, 0);
    assert.equal(config.globalSettings.scaleParallelUploads, false);
    assert.equal(config.globalSettings.logFilePath, '');
  });

  it('concurrent saves preserve both sections', async () => {
    const save1 = store.save({ hosters: { 'doodstream.com': [{ id: 'c1', enabled: true, authType: 'api', apiKey: 'concurrent-key' }] } });
    const save2 = store.save({ globalSettings: { alwaysOnTop: true } });
    await Promise.all([save1, save2]);
    const config = store.load();
    assert.equal(config.hosters['doodstream.com'][0].apiKey, 'concurrent-key');
    assert.equal(config.globalSettings.alwaysOnTop, true);
  });

  it('backup recovery when main file is corrupted', () => {
    // Write valid config first
    fs.writeFileSync(store.filePath, JSON.stringify({
      hosters: { 'doodstream.com': [{ id: 'bak-1', authType: 'api', apiKey: 'from-backup' }] },
      hosterSettings: {}, globalSettings: {}, history: []
    }), 'utf-8');
    // Copy to backup
    fs.copyFileSync(store.filePath, store.filePath + '.bak');
    // Corrupt main file
    fs.writeFileSync(store.filePath, 'CORRUPTED!!!', 'utf-8');
    const config = store.load();
    assert.equal(config.hosters['doodstream.com'][0].apiKey, 'from-backup');
  });
});