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('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('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('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');
  });
});