import 'dart:async';
import 'dart:convert';

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

class AppLocalizations {
  final Locale  locale;

   AppLocalizations (this.locale);

  static AppLocalizations? of(BuildContext context) {
    return Localizations.of(context, AppLocalizations);
  }

  static const LocalizationsDelegate delegate =
      _AppLocalizationsDelegate();

  late Map _localizedStrings;

  Future load() async {
    String jsonString =
        await rootBundle.loadString('lang/${locale.languageCode}.json');
    Map jsonMap = json.decode(jsonString);

    _localizedStrings = jsonMap.map((key, value) {
      return MapEntry(key, value.toString());
    });
    return true;
  }

  String translate(String key) {
    return _localizedStrings[key]!;
  }
}

class _AppLocalizationsDelegate
    extends LocalizationsDelegate {
  const _AppLocalizationsDelegate();

  @override
  bool isSupported(Locale locale) {
    return ['en', 'vi'].contains(locale.languageCode);
  }

  @override
  Future load(Locale locale) async {
    AppLocalizations localizations = new AppLocalizations(locale);
    await localizations.load();
    return localizations;
  }

  @override
  bool shouldReload(_AppLocalizationsDelegate old) => false;
}