import 'dart:async';

import 'package:flutter/foundation.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter_localizations/flutter_localizations.dart';
import 'package:intl/intl.dart' as intl;

import 'app_localizations_de.dart';
import 'app_localizations_en.dart';
import 'app_localizations_es.dart';
import 'app_localizations_fr.dart';

// ignore_for_file: type=lint

/// Callers can lookup localized strings with an instance of AppLocalizations
/// returned by `AppLocalizations.of(context)`.
///
/// Applications need to include `AppLocalizations.delegate()` in their app's
/// `localizationDelegates` list, and the locales they support in the app's
/// `supportedLocales` list. For example:
///
/// ```dart
/// import 'l10n/app_localizations.dart';
///
/// return MaterialApp(
///   localizationsDelegates: AppLocalizations.localizationsDelegates,
///   supportedLocales: AppLocalizations.supportedLocales,
///   home: MyApplicationHome(),
/// );
/// ```
///
/// ## Update pubspec.yaml
///
/// Please make sure to update your pubspec.yaml to include the following
/// packages:
///
/// ```yaml
/// dependencies:
///   # Internationalization support.
///   flutter_localizations:
///     sdk: flutter
///   intl: any # Use the pinned version from flutter_localizations
///
///   # Rest of dependencies
/// ```
///
/// ## iOS Applications
///
/// iOS applications define key application metadata, including supported
/// locales, in an Info.plist file that is built into the application bundle.
/// To configure the locales supported by your app, you’ll need to edit this
/// file.
///
/// First, open your project’s ios/Runner.xcworkspace Xcode workspace file.
/// Then, in the Project Navigator, open the Info.plist file under the Runner
/// project’s Runner folder.
///
/// Next, select the Information Property List item, select Add Item from the
/// Editor menu, then select Localizations from the pop-up menu.
///
/// Select and expand the newly-created Localizations item then, for each
/// locale your application supports, add a new item and select the locale
/// you wish to add from the pop-up menu in the Value field. This list should
/// be consistent with the languages listed in the AppLocalizations.supportedLocales
/// property.
abstract class AppLocalizations {
  AppLocalizations(String locale)
    : localeName = intl.Intl.canonicalizedLocale(locale.toString());

  final String localeName;

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

  static const LocalizationsDelegate<AppLocalizations> delegate =
      _AppLocalizationsDelegate();

  /// A list of this localizations delegate along with the default localizations
  /// delegates.
  ///
  /// Returns a list of localizations delegates containing this delegate along with
  /// GlobalMaterialLocalizations.delegate, GlobalCupertinoLocalizations.delegate,
  /// and GlobalWidgetsLocalizations.delegate.
  ///
  /// Additional delegates can be added by appending to this list in
  /// MaterialApp. This list does not have to be used at all if a custom list
  /// of delegates is preferred or required.
  static const List<LocalizationsDelegate<dynamic>> localizationsDelegates =
      <LocalizationsDelegate<dynamic>>[
        delegate,
        GlobalMaterialLocalizations.delegate,
        GlobalCupertinoLocalizations.delegate,
        GlobalWidgetsLocalizations.delegate,
      ];

  /// A list of this localizations delegate's supported locales.
  static const List<Locale> supportedLocales = <Locale>[
    Locale('de'),
    Locale('en'),
    Locale('es'),
    Locale('fr'),
  ];

  /// AppBar title of the home screen
  ///
  /// In en, this message translates to:
  /// **'Emergency'**
  String get appTitle;

  /// Label of the button/tooltip used to open the manual country picker
  ///
  /// In en, this message translates to:
  /// **'Select country manually'**
  String get selectCountryButton;

  /// Label of the button that retries country/number detection after an error
  ///
  /// In en, this message translates to:
  /// **'Try again'**
  String get retryButton;

  /// Fallback error message shown when the provider does not report a specific error
  ///
  /// In en, this message translates to:
  /// **'Unknown error while loading the emergency numbers.'**
  String get errorGeneric;

  /// Shown when the country could not be detected automatically (and no location permission info is shown separately)
  ///
  /// In en, this message translates to:
  /// **'Country could not be determined.'**
  String get countryUnknownMessage;

  /// Shown when the detected country has no entry in the emergency number database
  ///
  /// In en, this message translates to:
  /// **'Country not listed in the emergency number database. Only the global emergency number is available.'**
  String get countryNotInDatabaseMessage;

  /// AppBar title of the manual country picker screen
  ///
  /// In en, this message translates to:
  /// **'Select country'**
  String get pickerTitle;

  /// Hint text of the search field in the manual country picker screen
  ///
  /// In en, this message translates to:
  /// **'Search country'**
  String get pickerSearchHint;

  /// Empty state shown when the search filter matches no country
  ///
  /// In en, this message translates to:
  /// **'No country found.'**
  String get pickerNoResults;

  /// Semantics/tooltip label of an emergency button, combining the number's label and the number itself
  ///
  /// In en, this message translates to:
  /// **'{label}, call {number}'**
  String emergencyButtonSemanticLabel(String label, String number);
}

class _AppLocalizationsDelegate
    extends LocalizationsDelegate<AppLocalizations> {
  const _AppLocalizationsDelegate();

  @override
  Future<AppLocalizations> load(Locale locale) {
    return SynchronousFuture<AppLocalizations>(lookupAppLocalizations(locale));
  }

  @override
  bool isSupported(Locale locale) =>
      <String>['de', 'en', 'es', 'fr'].contains(locale.languageCode);

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

AppLocalizations lookupAppLocalizations(Locale locale) {
  // Lookup logic when only language code is specified.
  switch (locale.languageCode) {
    case 'de':
      return AppLocalizationsDe();
    case 'en':
      return AppLocalizationsEn();
    case 'es':
      return AppLocalizationsEs();
    case 'fr':
      return AppLocalizationsFr();
  }

  throw FlutterError(
    'AppLocalizations.delegate failed to load unsupported locale "$locale". This is likely '
    'an issue with the localizations generation tool. Please file an issue '
    'on GitHub with a reproducible sample app and the gen-l10n configuration '
    'that was used.',
  );
}