import 'dart:convert';
import 'dart:math';
import 'package:flutter_secure_storage/flutter_secure_storage.dart';

class CryptoManager {
  static const _databaseKeyName = 'glp1_sqlcipher_master_key';
  final FlutterSecureStorage _secureStorage;

  CryptoManager({FlutterSecureStorage? secureStorage})
      : _secureStorage = secureStorage ?? const FlutterSecureStorage();

  Future<String> getOrCreateDatabaseEncryptionKey() async {
    final existingKey = await _secureStorage.read(key: _databaseKeyName);
    if (existingKey != null && existingKey.isNotEmpty) {
      return existingKey;
    }

    final random = Random.secure();
    final values = List<int>.generate(32, (i) => random.nextInt(256));
    final newKey = base64UrlEncode(values);

    await _secureStorage.write(key: _databaseKeyName, value: newKey);
    return newKey;
  }
}