nj/app/lib/features/auth/bloc/auth_state.dart

// 认证状态 — AuthBloc 输出的 UI 状态

part of 'auth_bloc.dart';

/// 认证状态基类 — 使用 sealed class 实现穷尽匹配
sealed class AuthState {
  const AuthState();
}

/// 初始状态 — App 刚启动
final class AuthInitial extends AuthState {
  const AuthInitial();
}

/// 加载中 — 正在检查本地存储的认证状态
final class AuthLoading extends AuthState {
  const AuthLoading();
}

/// 未认证 — 需要登录
final class Unauthenticated extends AuthState {
  const Unauthenticated();
}

/// 认证中 — 正在登录或注册
final class Authenticating extends AuthState {
  /// 是否为注册模式（显示不同的 UI 提示）
  final bool isRegister;

  const Authenticating({this.isRegister = false});
}

/// 已认证 — 用户已登录
final class Authenticated extends AuthState {
  final User user;

  /// 是否需要角色选择（新注册用户还没有角色）
  final bool needsRoleSelection;

  /// 是否需要班级码加入（学生/家长角色）
  final bool needsClassCode;

  const Authenticated({
    required this.user,
    this.needsRoleSelection = false,
    this.needsClassCode = false,
  });

  Authenticated copyWith({
    User? user,
    bool? needsRoleSelection,
    bool? needsClassCode,
  }) =>
      Authenticated(
        user: user ?? this.user,
        needsRoleSelection: needsRoleSelection ?? this.needsRoleSelection,
        needsClassCode: needsClassCode ?? this.needsClassCode,
      );
}

/// 认证错误 — 登录/注册失败
final class AuthError extends AuthState {
  final String message;

  /// 是否可以重试
  final bool retryable;

  const AuthError(this.message, {this.retryable = true});
}

/// 需要家长授权 — 未满 14 岁用户需要家长确认
final class ParentAuthRequired extends AuthState {
  final User user;

  const ParentAuthRequired(this.user);
}