function registerFontSyncTask(options) {
  const backgroundTaskQueue = options && options.backgroundTaskQueue;
  const uploadSyncService = options && options.uploadSyncService;

  if (!backgroundTaskQueue || !uploadSyncService) {
    throw new Error('registerFontSyncTask requires the font sync dependencies.');
  }

  backgroundTaskQueue.setTaskHandler('font-sync', async function (task) {
    const payload = task && task.payload ? task.payload : task || {};
    const uploadDir = String(payload.uploadDir || '').trim();
    const playerIdentifier = String(payload.playerIdentifier || payload.deviceId || '').trim();
    const operations = Array.isArray(payload.operations)
      ? payload.operations
      : Array.isArray(payload.uploadPaths)
        ? payload.uploadPaths.map(function (uploadPath) {
          return { type: String(payload.action || 'put').trim().toLowerCase(), uploadPath: uploadPath };
        })
        : [];

    if (!uploadDir || !operations.length) {
      return;
    }

    for (let i = 0; i < operations.length; i += 1) {
      const operation = operations[i] || {};
      const uploadPath = String(operation.uploadPath || '').trim();
      if (!uploadPath) {
        continue;
      }
      if (String(operation.type || '').trim().toLowerCase() === 'delete') {
        await uploadSyncService.removeUploadFileFromPlayer(uploadPath, uploadDir, undefined, playerIdentifier);
      } else {
        await uploadSyncService.pushUploadFileToPlayer(uploadPath, uploadDir, undefined, playerIdentifier);
      }
    }
  });
}

module.exports = { registerFontSyncTask };