import '../../nostr/models/nostr_profile.dart';

/// Data model representing a user session.
/// 
/// This model stores user identification and authentication information
/// for session management and data isolation.
class User {
  /// Unique identifier for the user.
  final String id;

  /// Display name or username for the user.
  final String username;

  /// Optional authentication token or session token.
  final String? token;

  /// Timestamp when the session was created (milliseconds since epoch).
  final int createdAt;

  /// Optional Nostr profile data (if logged in via Nostr).
  final NostrProfile? nostrProfile;

  /// Creates a [User] instance.
  /// 
  /// [id] - Unique identifier for the user.
  /// [username] - Display name or username.
  /// [token] - Optional authentication token.
  /// [createdAt] - Session creation timestamp (defaults to current time).
  /// [nostrProfile] - Optional Nostr profile data.
  User({
    required this.id,
    required this.username,
    this.token,
    int? createdAt,
    this.nostrProfile,
  }) : createdAt = createdAt ?? DateTime.now().millisecondsSinceEpoch;

  /// Creates a [User] from a Map (e.g., from database or JSON).
  factory User.fromMap(Map<String, dynamic> map) {
    return User(
      id: map['id'] as String,
      username: map['username'] as String,
      token: map['token'] as String?,
      createdAt: map['created_at'] as int?,
      nostrProfile: map['nostr_profile'] != null
          ? NostrProfile.fromJson(map['nostr_profile'] as Map<String, dynamic>)
          : null,
    );
  }

  /// Converts the [User] to a Map for storage.
  Map<String, dynamic> toMap() {
    return {
      'id': id,
      'username': username,
      'token': token,
      'created_at': createdAt,
      'nostr_profile': nostrProfile?.toJson(),
    };
  }

  /// Creates a copy of this [User] with updated fields.
  User copyWith({
    String? id,
    String? username,
    String? token,
    int? createdAt,
    NostrProfile? nostrProfile,
  }) {
    return User(
      id: id ?? this.id,
      username: username ?? this.username,
      token: token ?? this.token,
      createdAt: createdAt ?? this.createdAt,
      nostrProfile: nostrProfile ?? this.nostrProfile,
    );
  }

  @override
  String toString() {
    return 'User(id: $id, username: $username, createdAt: $createdAt)';
  }

  @override
  bool operator ==(Object other) {
    if (identical(this, other)) return true;
    return other is User && other.id == id;
  }

  @override
  int get hashCode => id.hashCode;
}