import 'package:objectbox/objectbox.dart';

/// User entity - works for both HOME and GUEST servers
/// 
/// On HOME server:
/// - isLocal = true
/// - stores password, encrypted private key
/// - this is where identity lives
/// 
/// On GUEST server:
/// - isLocal = false
/// - homeServer contains the URL of user's home
/// - publicKey cached for verification
@Entity()
class User {
  @Id()
  int id = 0;

  // Global identifier: "username@homeserver.com"
  @Unique()
  String userId;

  // Basic profile
  @Index()
  String username;
  String? displayName;
  String? avatarUrl;
  String? bio;

  // Identity
  String publicKey; // Ed25519 public key, always stored

  // HOME SERVER ONLY: Auth & key backup
  String? passwordHash;
  String? encryptedPrivateKey; // Encrypted with user's password
  String? keyPairSalt;

  // Server relationship
  bool isLocal; // true = this is their home server
  String? homeServer; // if guest, where is their home? (e.g., "https://my.server.com")

  // Server-specific
  List<String> roles; // ["admin", "moderator", "member"]

  @Property(type: PropertyType.date)
  DateTime createdAt;

  @Property(type: PropertyType.date)
  DateTime? lastSyncedAt; // When profile was last refreshed from home

  User({
    required this.userId,
    required this.username,
    required this.publicKey,
    required this.isLocal,
    this.displayName,
    this.avatarUrl,
    this.bio,
    this.passwordHash,
    this.encryptedPrivateKey,
    this.keyPairSalt,
    this.homeServer,
    List<String>? roles,
    DateTime? createdAt,
    DateTime? lastSyncedAt,
  })  : roles = roles ?? ['member'],
        createdAt = createdAt ?? DateTime.now(),
        lastSyncedAt = lastSyncedAt;
}

@Entity()
class Channel {
  @Id()
  int id = 0;

  @Unique()
  String name;

  String? description;

  @Property(type: PropertyType.date)
  DateTime createdAt;

  Channel({
    required this.name,
    this.description,
    DateTime? createdAt,
  }) : createdAt = createdAt ?? DateTime.now();
}

@Entity()
class Message {
  @Id()
  int id = 0;

  int channelId;

  // Author info - includes enough for cross-server profile fetch
  int authorLocalId;
  String authorUserId; // "alice@homeserver.com"
  String? authorHomeServer; // for profile fetching

  // Cached for display (snapshot at message time)
  String authorUsername;
  String? authorAvatarUrl;

  String content;

  @Property(type: PropertyType.date)
  DateTime createdAt;

  @Property(type: PropertyType.date)
  DateTime? editedAt;

  Message({
    required this.channelId,
    required this.authorLocalId,
    required this.authorUserId,
    required this.authorUsername,
    required this.content,
    this.authorHomeServer,
    this.authorAvatarUrl,
    DateTime? createdAt,
    this.editedAt,
  }) : createdAt = createdAt ?? DateTime.now();
}