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

class SecureStorageUtil {
  // 单例对象
  static final SecureStorageUtil _singleton = SecureStorageUtil._internal();

  // 私有构造函数
  SecureStorageUtil._internal();

  // 工厂构造函数返回单例对象
  factory SecureStorageUtil() => _singleton;

  // Secure Storage 实例
  final _storage = const FlutterSecureStorage();

  // 存储字符串
  Future<void> setString(String key, String value) async {
    await _storage.write(key: key, value: value);
  }

  // 读取字符串
  Future<String?> getString(String key) async {
    return await _storage.read(key: key);
  }

  // 存储JSON数组
  Future<void> setJsonList(String key, List<Map<String, dynamic>> jsonList) async {
    final jsonString = jsonEncode(jsonList);
    await _storage.write(key: key, value: jsonString);
  }

  // 读取JSON数组
  Future<List<Map<String, dynamic>>?> getJsonList(String key) async {
    final jsonString = await _storage.read(key: key);
    return jsonString != null ? List<Map<String, dynamic>>.from(jsonDecode(jsonString)) : null;
  }

  // 删除指定键的数据
  Future<void> delete(String key) async {
    await _storage.delete(key: key);
  }

  // 删除所有数据
  Future<void> deleteAll() async {
    await _storage.deleteAll();
  }
}