import 'dart:convert';

import 'package:ef/ef.dart';
import 'package:flutter/services.dart';

class AppLanguage extends Translations {
  // 私有构造函数
  AppLanguage._internal();

  // 单例实例
  static final AppLanguage _instance = AppLanguage._internal();

  factory AppLanguage() => _instance;

  // 缓存翻译数据
  final Map<String, Map<String, String>> _localizedValues = {};

  @override
  Map<String, Map<String, String>> get keys => _localizedValues;

  // 动态加载语言文件
  Future<void> loadLanguage(String languageCode) async {
    if (_localizedValues.containsKey(languageCode)) {
      return; // 如果语言已经加载，无需重复加载
    }

    try {
      // 加载 JSON 文件
      final jsonString =
          await rootBundle.loadString('assets/langs/$languageCode.json');
      final Map<String, dynamic> jsonMap = json.decode(jsonString);

      // 扁平化 JSON 数据并存储到缓存
      _localizedValues[languageCode] = _flattenJson(jsonMap);

      // 通知 GetX 更新 keys
      // Get.forceAppUpdate();
      Get.appendTranslations(keys);
    } catch (e) {
      print('Error loading $languageCode language file: $e');
    }
  }

  // 扁平化嵌套 JSON 数据
  Map<String, String> _flattenJson(Map<String, dynamic> json,
      [String prefix = '']) {
    final Map<String, String> flatMap = {};
    json.forEach((key, value) {
      final newKey = prefix.isEmpty ? key : '$prefix.$key';
      if (value is Map<String, dynamic>) {
        flatMap.addAll(_flattenJson(value, newKey));
      } else {
        flatMap[newKey] = value.toString();
      }
    });
    return flatMap;
  }

  // 清理语言缓存
  void clearLanguage(String languageCode) {
    _localizedValues.remove(languageCode);
  }
}