/// Domain Entity: Favorite
///
/// Pure business entity representing a user's favorite product.
/// This entity is framework-independent and contains only business logic.
library;

/// Favorite Entity
///
/// Represents a product that a user has marked as favorite.
/// Used across all layers but originates in the domain layer.
class Favorite {
  /// Unique identifier for the favorite entry
  final String favoriteId;

  /// Reference to the product that was favorited
  final String productId;

  /// Reference to the user who favorited the product
  final String userId;

  /// Timestamp when the product was favorited
  final DateTime createdAt;

  const Favorite({
    required this.favoriteId,
    required this.productId,
    required this.userId,
    required this.createdAt,
  });

  /// Copy with method for creating modified copies
  Favorite copyWith({
    String? favoriteId,
    String? productId,
    String? userId,
    DateTime? createdAt,
  }) {
    return Favorite(
      favoriteId: favoriteId ?? this.favoriteId,
      productId: productId ?? this.productId,
      userId: userId ?? this.userId,
      createdAt: createdAt ?? this.createdAt,
    );
  }

  @override
  String toString() {
    return 'Favorite(favoriteId: $favoriteId, productId: $productId, '
        'userId: $userId, createdAt: $createdAt)';
  }

  @override
  bool operator ==(Object other) {
    if (identical(this, other)) return true;

    return other is Favorite &&
        other.favoriteId == favoriteId &&
        other.productId == productId &&
        other.userId == userId &&
        other.createdAt == createdAt;
  }

  @override
  int get hashCode {
    return Object.hash(favoriteId, productId, userId, createdAt);
  }
}