readful/lib/services/database_service.dart

import 'package:hive_flutter/hive_flutter.dart';
import 'package:path_provider/path_provider.dart';
import '../models/book.dart';

class DatabaseService {
  static DatabaseService? _instance;
  static DatabaseService get instance => _instance ??= DatabaseService._();

  DatabaseService._();

  late Box<Book> _booksBox;

  Future<void> init() async {
    try {
      // 1. 获取应用文档目录
      final appDocumentDir = await getApplicationDocumentsDirectory();
      // 2. 初始化Hive
      await Hive.initFlutter(appDocumentDir.path);

      // 3. 注册枚举TypeAdapter（使用内置的枚举适配器）
      Hive.registerAdapter(BookFormatAdapter());
      Hive.registerAdapter(ReadingStatusAdapter());

      // 4. 注册Book TypeAdapter
      Hive.registerAdapter(BookAdapter());

      // 5. 打开Book Box
      _booksBox = await Hive.openBox<Book>('books');

      print('✅ Hive数据库初始化成功');
    } catch (e) {
      print('❌ Hive数据库初始化失败: $e');
      rethrow; // 重新抛出异常，让调用者知道初始化失败
    }
  }

// 获取Book Box的方法
  Box<Book> getBooksBox() {
    if (!Hive.isBoxOpen('books')) {
      throw Exception('Book Box未打开，请先调用init()');
    }
    return _booksBox; // 添加这行返回语句
  }

  /// 关闭数据库
  Future<void> close() async {
    await _booksBox.close();
    await Hive.close();
  }
}