import 'dart:convert';
import 'package:flutter/services.dart';
import 'package:flutter/material.dart';

class AppLocalizations {
  final Locale locale;
  Map<String, dynamic> _localizedStrings = {};
  
  AppLocalizations(this.locale);
  
  static AppLocalizations of(BuildContext context) {
    return Localizations.of<AppLocalizations>(context, AppLocalizations)!;
  }
  
  static const LocalizationsDelegate<AppLocalizations> delegate = _AppLocalizationsDelegate();
  
  Future<bool> load() async {
    try {
      String jsonString = await rootBundle.loadString(
        'assets/languages/${locale.languageCode}-${locale.countryCode}.json',
      );
      Map<String, dynamic> jsonMap = json.decode(jsonString);
      _localizedStrings = jsonMap;
      return true;
    } catch (e) {
      debugPrint('❌ [AppLocalizations] 加载语言文件失败: $e');
      return false;
    }
  }
  
  String translate(String key) {
    final keys = key.split('.');
    dynamic value = _localizedStrings;
    
    for (final k in keys) {
      if (value is Map<String, dynamic>) {
        value = value[k];
      } else {
        return key;
      }
    }
    
    return value?.toString() ?? key;
  }
}

class _AppLocalizationsDelegate extends LocalizationsDelegate<AppLocalizations> {
  const _AppLocalizationsDelegate();
  
  @override
  bool isSupported(Locale locale) {
    return ['zh', 'en'].contains(locale.languageCode);
  }
  
  @override
  Future<AppLocalizations> load(Locale locale) async {
    final localizations = AppLocalizations(locale);
    await localizations.load();
    return localizations;
  }
  
  @override
  bool shouldReload(_AppLocalizationsDelegate old) => false;
}