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// Example raw data from an external API
const rawApiData = {
  "id": "usr_12345",
  "firstName": "John",
  "lastName": "Doe",
  "emailAddress": "john.doe@example.com",
  "status": "active",
  "registrationDate": "2023-01-15T10:30:00Z",
  "profile": {
    "address": {
      "street": "123 Main St",
      "city": "Anytown",
      "zipCode": "12345"
    },
    "preferences": {
      "notificationsEnabled": true,
      "theme": "dark"
    }
  }
};

// Define the desired frontend model interface (conceptual, if using TypeScript it would be a type)
/*
interface UserViewModel {
  userId: string;
  fullName: string;
  email: string;
  isActive: boolean;
  registeredAt: Date;
  address: string; // Simplified for display
  settings: {
    notifications: boolean;
    displayTheme: string;
  };
}
*/

/**
 * Transforms raw API user data into a simplified frontend view model.
 * @param {object} rawData - The raw user object from the API.
 * @returns {object} The transformed UserViewModel object.
 */
function transformUserData(rawData) {
  if (!rawData) {
    return null;
  }

  return {
    userId: rawData.id,
    fullName: `${rawData.firstName} ${rawData.lastName}`,
    email: rawData.emailAddress,
    isActive: rawData.status === 'active',
    registeredAt: new Date(rawData.registrationDate), // Convert string to Date object
    address: `${rawData.profile.address.street}, ${rawData.profile.address.city}, ${rawData.profile.address.zipCode}`,
    settings: {
      notifications: rawData.profile.preferences.notificationsEnabled,
      displayTheme: rawData.profile.preferences.theme
    }
  };
}

const transformedUser = transformUserData(rawApiData);
console.log('Transformed User Data:', transformedUser);

// Example of using the transformed data
// document.getElementById('user-name').textContent = transformedUser.fullName;
// document.getElementById('user-email').textContent = transformedUser.email;
// document.getElementById('user-status').textContent = transformedUser.isActive ? 'Active' : 'Inactive';