import 'dart:convert';

import 'package:shared_preferences/shared_preferences.dart';

import '../kt_model/kt_goods_bean.dart';

class KtPurchaseRestoreUtil {
  static final KtPurchaseRestoreUtil _instance = KtPurchaseRestoreUtil._internal();

  factory KtPurchaseRestoreUtil() => _instance;

  KtPurchaseRestoreUtil._internal();

  static const String _cacheKey = 'restore_goods_list';

  /// 保存失败的goods到本地缓存
  Future<void> cacheFailedGoods(KtGoodsBean goods) async {
    final prefs = await SharedPreferences.getInstance();
    List<String> goodsList = prefs.getStringList(_cacheKey) ?? [];
    goodsList.add(json.encode(goods.toJson()));
    print('-----goods.toJson:${goods.toJson()}');
    await prefs.setStringList(_cacheKey, goodsList);
  }

  /// 读取本地缓存的goods列表
  Future<List<KtGoodsBean>> getCachedGoodsList() async {
    final prefs = await SharedPreferences.getInstance();
    List<String> goodsList = prefs.getStringList(_cacheKey) ?? [];
    return goodsList.map((e) => KtGoodsBean.fromJson(json.decode(e))).toList();
  }

  /// 清除本地缓存
  Future<void> clearCachedGoods() async {
    final prefs = await SharedPreferences.getInstance();
    await prefs.remove(_cacheKey);
  }

  /// 移除指定goods
  Future<void> removeGoods(KtGoodsBean goods) async {
    final prefs = await SharedPreferences.getInstance();
    List<String> goodsList = prefs.getStringList(_cacheKey) ?? [];
    goodsList.removeWhere((e) {
      final g = KtGoodsBean.fromJson(json.decode(e));
      return g.id == goods.id;
    });
    await prefs.setStringList(_cacheKey, goodsList);
  }
}