import 'dart:convert';

import 'package:flutter/foundation.dart';
import 'package:patbond_flutter/data/demo_data.dart';
import 'package:patbond_flutter/models/models.dart';
import 'package:shared_preferences/shared_preferences.dart';

class AppState extends ChangeNotifier {
  static const _petKey = 'patbond_pet';
  static const _locationWeatherKey = 'patbond_location_weather';

  /// 首页问候卡 / 创作页 / 主壳头像仍消费的 demo 宠物（T2-12 起档案
  /// Tab 已切独立 pets feature 真实数据；此 demo 随后续工单收敛）。
  ///
  /// **demo 帖子列表已于 T3-17 退役**：Feed / 详情页自 T3-14/15 起消费
  /// community 真实数据，发布页自 T3-17 起走真实两步上传 + 建草稿/迁移
  /// 发布，`posts` / `publishPost` / `updatePost` 与其
  /// shared_preferences 持久化一并删除（03 号评估 §1.1 判定）。
  PetProfile pet = initialPet;
  LocationWeather locationWeather = initialLocationWeather;
  bool isReady = false;

  Future<void> load() async {
    try {
      final preferences = await SharedPreferences.getInstance();
      final savedPet = preferences.getString(_petKey);
      final savedLocationWeather = preferences.getString(_locationWeatherKey);

      if (savedPet != null) {
        pet = PetProfile.fromJson(jsonDecode(savedPet) as Map<String, dynamic>);
      }
      if (savedLocationWeather != null) {
        locationWeather = LocationWeather.fromJson(
          jsonDecode(savedLocationWeather) as Map<String, dynamic>,
        );
      }
    } catch (error, stackTrace) {
      debugPrint('读取本地数据失败，已使用默认数据：$error\n$stackTrace');
      pet = initialPet;
      locationWeather = initialLocationWeather;
    } finally {
      isReady = true;
      notifyListeners();
    }
  }

  Future<void> updateLocationWeather(LocationWeather value) async {
    locationWeather = value;
    notifyListeners();
    await _save(_locationWeatherKey, value.toJson());
  }

  Future<void> resetDemoData() async {
    pet = initialPet;
    locationWeather = initialLocationWeather;
    notifyListeners();
    final preferences = await SharedPreferences.getInstance();
    await Future.wait([
      preferences.remove(_petKey),
      preferences.remove(_locationWeatherKey),
    ]);
  }

  Future<void> _save(String key, Object value) async {
    try {
      final preferences = await SharedPreferences.getInstance();
      await preferences.setString(key, jsonEncode(value));
    } catch (error, stackTrace) {
      debugPrint('保存本地数据失败：$error\n$stackTrace');
    }
  }
}