workers/settings-worker.js

// Settings Worker - Handles Android system settings in parallel
self.addEventListener('message', async (e) => {
  const { action, settings } = e.data;
  
  switch (action) {
    case 'READ_ALL':
      const allSettings = await readAllSettings();
      self.postMessage({ type: 'SETTINGS_BULK', settings: allSettings });
      break;
      
    case 'READ':
      const value = await readSetting(settings.key);
      self.postMessage({ type: 'SETTING_VALUE', key: settings.key, value });
      break;
      
    case 'WRITE':
      await writeSetting(settings.key, settings.value);
      self.postMessage({ type: 'SETTING_SAVED', key: settings.key });
      break;
      
    case 'WATCH':
      await watchSetting(settings.key);
      break;
  }
});

const ANDROID_SETTINGS = {
  // Display
  'display_brightness': 'system.SCREEN_BRIGHTNESS',
  'display_auto_rotate': 'system.ACCELEROMETER_ROTATION',
  'display_font_size': 'system.FONT_SCALE',
  'display_screen_timeout': 'system.SCREEN_OFF_TIMEOUT',
  'display_night_mode': 'secure.UI_NIGHT_MODE',
  
  // Sound
  'sound_volume_ring': 'system.VOLUME_RING',
  'sound_volume_media': 'system.VOLUME_MUSIC',
  'sound_volume_alarm': 'system.VOLUME_ALARM',
  'sound_vibrate_mode': 'system.VIBRATE_WHEN_RINGING',
  'sound_dnd': 'global.ZEN_MODE',
  
  // Notifications
  'notification_enabled': 'global.ENABLED_NOTIFICATION_LISTENERS',
  'notification_badging': 'secure.NOTIFICATION_BADGING',
  'notification_heads_up': 'global.HEADS_UP_NOTIFICATIONS_ENABLED',
  
  // Connectivity
  'wifi_enabled': 'global.WIFI_ON',
  'mobile_data': 'global.MOBILE_DATA',
  'airplane_mode': 'global.AIRPLANE_MODE_ON',
  'bluetooth_enabled': 'global.BLUETOOTH_ON',
  
  // Location
  'location_mode': 'secure.LOCATION_MODE',
  
  // Privacy
  'camera_disabled': 'secure.CAMERA_DISABLED',
  'microphone_disabled': 'secure.MICROPHONE_DISABLED',
};

async function readAllSettings() {
  const results = {};
  const batch = [];
  
  // Read in parallel batches of 4
  const entries = Object.entries(ANDROID_SETTINGS);
  for (let i = 0; i < entries.length; i += 4) {
    const batch = entries.slice(i, i + 4).map(([key, uri]) => readSetting(key));
    await Promise.all(batch);
  }
  
  return results;
}

async function readSetting(key) {
  // Try to access via Android interface or fallback
  if (self.Android?.Settings?.get) {
    return self.Android.Settings.get(ANDROID_SETTINGS[key]);
  }
  
  // Fallback for PWA testing
  return localStorage.getItem(`arch_setting_${key}`) ?? getDefaultSetting(key);
}

async function writeSetting(key, value) {
  if (self.Android?.Settings?.put) {
    self.Android.Settings.put(ANDROID_SETTINGS[key], value);
  }
  localStorage.setItem(`arch_setting_${key}`, value);
}

function getDefaultSetting(key) {
  const defaults = {
    'display_brightness': 128,
    'display_auto_rotate': 1,
    'display_screen_timeout': 30000,
    'sound_volume_media': 80,
    'wifi_enabled': 1,
    'location_mode': 3
  };
  return defaults[key] ?? null;
}

async function watchSetting(key) {
  // Set up content observer simulation
  setInterval(async () => {
    const value = await readSetting(key);
    self.postMessage({ type: 'SETTING_CHANGED', key, value });
  }, 1000);
}