// import { UsersEntity } from 'src/entities/Users.entity';

/**
 * SignupEvent - Domain event for user registration operations
 *
 * This event class represents a user registration/signup occurrence in the
 * application's event-driven architecture. While currently empty (with a
 * commented-out constructor), it serves as a placeholder for future
 * enhancements when registration-related data needs to be passed to event
 * handlers.
 *
 * Domain events like this enable:
 * - Decoupling of business logic from side effects
 * - Asynchronous processing of post-registration tasks
 * - Scalable architecture through event-driven patterns
 * - Easy addition of new registration-related features
 *
 * Typical use cases for signup events:
 * 1. Send welcome email after registration
 * 2. Create user profile in external systems
 * 3. Update analytics and metrics
 * 4. Trigger onboarding workflows
 * 5. Assign default permissions/roles
 * 6. Log registration for security monitoring
 *
 * @example
 * // Creating and emitting the event (future implementation)
 * const signupEvent = new SignupEvent(newUser);
 * this.eventEmitter.emit('user.signup', signupEvent);
 *
 * @example
 * // Handling the event in multiple listeners
 * @OnEvent('user.signup')
 * async handleWelcomeEmail(event: SignupEvent) {
 *   await this.emailService.sendWelcomeEmail(event.user.email);
 * }
 *
 * @OnEvent('user.signup')
 * async handleAnalyticsTracking(event: SignupEvent) {
 *   await this.analyticsService.trackSignup(event.user);
 * }
 */
export class SignupEvent {
  /**
   * Placeholder constructor for future implementation
   *
   * Currently commented out but intended to accept user data when needed.
   * When implemented, this would allow passing user information to event
   * handlers for processing registration side effects.
   *
   * @param user - The newly registered user entity (optional/planned)
   */
  // constructor(public user: UsersEntity | undefined | null) {}
  /**
   * Note: The empty implementation suggests this event class is either:
   * 1. A placeholder for future development
   * 2. Used for event type discrimination without payload
   * 3. Part of a legacy implementation that will be updated
   *
   * Recommended enhancement when implementing:
   * - Add user property with proper typing
   * - Include registration metadata (timestamp, source, referral)
   * - Consider making properties readonly for immutability
   */
}
