import 'dart:math';
import 'dart:typed_data';

import 'package:base32/base32.dart';
import 'package:libac_dart/nbt/NbtUtils.dart';
import 'package:libac_dart/nbt/impl/CompoundTag.dart';
import 'package:libac_dart/utils/uuid/NbtUUID.dart';
import 'package:libac_dart/utils/uuid/UUID.dart';

/// The user class is a user object.
///
/// This, most basic object, will only contain data needed for user identification. Issues, groups, etc shall be handled in another area.
class User {
  String sName;
  UUID ID;

  User({required this.sName, required this.ID});
}

String generateTOTPSecret({int length = 32}) {
  final random = Random.secure();
  final List<int> bytes = List.generate(length, (_) => random.nextInt(256));
  return base32.encode(Uint8List.fromList(bytes));
}

class DBUser {
  String sName;
  UUID ID;
  late String TOTPSecret;

  DBUser({required this.sName, required this.ID, String? totp}) {
    if (totp == null) {
      TOTPSecret = generateTOTPSecret();
    } else {
      TOTPSecret = totp;
    }
  }

  factory DBUser.load({required CompoundTag serialized}) {
    UUID IDv4 = UUID.generate(4);
    NbtUUID saved = NbtUtils.readUUID(serialized, "id");
    IDv4 = saved.toUUID();
    DBUser user = DBUser(
      sName: serialized.get("name")?.asString() ?? "",
      ID: IDv4,
      totp: serialized.get("mfa_secret")?.asString() ?? "",
    );

    return user;
  }

  void regenerateTOTP() {
    TOTPSecret = generateTOTPSecret();
  }
}