import 'dart:convert';
import 'dart:ui';

import 'package:aitrainer_app/service/logging.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/services.dart';

class AppLocalizations with Logging {
  Locale locale;
  bool isTest;

  AppLocalizations(this.locale, {this.isTest = false});

  // Helper method to keep the code in the widgets concise
  // Localizations are accessed using an InheritedWidget "of" syntax
  static AppLocalizations of(BuildContext context) {
    return Localizations.of<AppLocalizations>(context, AppLocalizations);
  }

  // Static member to have a simple access to the delegate from the MaterialApp
  static const LocalizationsDelegate<AppLocalizations> delegate = AppLocalizationsDelegate();

  Map<String, String> _localizedStrings;

  setLocale(Locale locale) {
    this.locale = locale;
  }

  Future<bool> load() async {
    // Load the language JSON file from the "lang" folder
    log(" -- load language pieces " + locale.languageCode);
    String jsonString = await rootBundle.loadString('i18n/${locale.languageCode}.json');
    Map<String, dynamic> jsonMap = json.decode(jsonString);

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

    return true;
  }

  Future<AppLocalizations> loadTest(Locale locale) async {
    return AppLocalizations(locale);
  }

  // This method will be called from every widget which needs a localized text
  String translate(String key) {
    if (isTest) return key;
    String translated = _localizedStrings[key];
    return translated != null ? translated : key;
  }
}

class AppLocalizationsDelegate extends LocalizationsDelegate<AppLocalizations> {
  final bool isTest;
  // This delegate instance will never change (it doesn't even have fields!)
  // It can provide a constant constructor.
  const AppLocalizationsDelegate({this.isTest = false});

  @override
  bool isSupported(Locale locale) {
    // Include all of your supported language codes here
    return ['en', 'hu'].contains(locale.languageCode);
  }

  @override
  Future<AppLocalizations> load(Locale locale) async {
    // AppLocalizations class is where the JSON loading actually runs
    AppLocalizations localizations = new AppLocalizations(locale, isTest: this.isTest);
    if (isTest) {
      await localizations.loadTest(locale);
    } else {
      await localizations.load();
    }
    return localizations;
  }

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