Notrufnummern-Datenbasis, Ländererkennung, State-Management und Lokalisierung (AP1-AP7)
Implementiert den kompletten Kern-Flow der Emergency App gemäß docs/plan.md: - Notrufnummern-Datenbasis für 199 Länder + Modelle/Repository (AP1) - DialerService für tel:-Notrufe ohne Auto-Dial (AP2) - Statisches UI mit Panik-Button-Fallback (AP3) - Priorisierte Ländererkennung: SIM/Netz -> GPS/Geocoding -> Cache (AP4) - EmergencyProvider verdrahtet Repository/LocationService mit der UI (AP5) - Manuelle Länderauswahl als Fallback samt eigener Priorität (AP6) - UI-Lokalisierung (de/en/fr/es), an erkanntes Land gekoppelt (AP7) Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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import 'package:flutter/material.dart';
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import 'package:provider/provider.dart';
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import '../../l10n/app_localizations.dart';
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import '../../models/country.dart';
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import '../../models/emergency_number.dart';
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import '../../models/emergency_type.dart';
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import '../../providers/emergency_provider.dart';
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import '../../providers/emergency_status.dart';
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import 'country_picker_screen.dart';
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import 'widgets/country_header.dart';
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import 'widgets/emergency_button.dart';
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/// Startbildschirm mit Länder-Header und Notruf-Buttons.
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///
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/// AP5 (State-Integration): Land und Ladezustand kommen jetzt aus dem
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/// [EmergencyProvider] (SIM/GPS/Cache-Ermittlungskette aus AP4), nicht mehr
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/// aus einem hartkodierten ISO-Code (AP3).
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class HomeScreen extends StatefulWidget {
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const HomeScreen({super.key});
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@override
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State<HomeScreen> createState() => _HomeScreenState();
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}
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class _HomeScreenState extends State<HomeScreen> {
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@override
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void initState() {
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super.initState();
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// Einmaliger Start der Ermittlungskette nach dem ersten Frame: init()
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// ruft synchron (vor dem ersten await) notifyListeners() auf, was
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// während der laufenden Baumkonstruktion (initState) zu "setState()
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// called during build" führen würde – daher erst im Post-Frame-Callback.
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WidgetsBinding.instance.addPostFrameCallback((_) {
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if (mounted) context.read<EmergencyProvider>().init();
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});
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}
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/// Globaler Panikmodus-Button (Plan Abschnitt 2 + 6): 112 funktioniert als
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/// GSM-weiter Fallback in den meisten Mobilfunknetzen und muss unabhängig
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/// vom Lade-/Fehlerzustand der Ländererkennung immer erreichbar sein.
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static const _panicNumber = EmergencyNumber(
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type: EmergencyType.general,
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number: '112',
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labelDe: 'Internationaler Notruf',
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labelEn: 'International Emergency',
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);
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/// True, wenn das erkannte Land bereits eine `general`-Nummer "112" führt
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/// (z. B. DE) – dann würde der Panik-Button dieselbe Nummer doppelt zeigen.
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bool _countryAlreadyHasPanicNumber(Country country) {
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return country.numbers.any(
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(n) => n.type == EmergencyType.general && n.number == _panicNumber.number,
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);
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}
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bool _showPanicButton(EmergencyProvider provider) {
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final country = provider.country;
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if (provider.status == EmergencyStatus.ready && country != null) {
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return !_countryAlreadyHasPanicNumber(country);
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}
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// Ladezustand, Fehler, countryUnknown oder Land nicht in Datenbasis:
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// Panik-Button ist die einzig sichere Konstante, also immer sichtbar.
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return true;
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}
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/// Öffnet den `CountryPickerScreen` (Plan Abschnitt 7 + 8, AP6: manuelle
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/// Länderauswahl als Fallback, wenn das Land nicht automatisch ermittelbar
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/// ist bzw. jederzeit als bewusste Nutzerentscheidung).
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void _openCountryPicker(BuildContext context) {
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Navigator.of(context).push(MaterialPageRoute(builder: (_) => const CountryPickerScreen()));
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}
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Widget _buildContent(BuildContext context, EmergencyProvider provider) {
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final l10n = AppLocalizations.of(context)!;
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switch (provider.status) {
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case EmergencyStatus.initializing:
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case EmergencyStatus.locating:
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return const Center(child: CircularProgressIndicator());
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case EmergencyStatus.error:
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return _StatusMessage(
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message: provider.errorMessage ?? l10n.errorGeneric,
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retryLabel: l10n.retryButton,
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selectCountryLabel: l10n.selectCountryButton,
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onRetry: () => context.read<EmergencyProvider>().retry(),
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onSelectCountry: () => _openCountryPicker(context),
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);
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// permissionDenied wird bewusst wie countryUnknown behandelt, siehe
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// Doc-Kommentar in EmergencyProvider.
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case EmergencyStatus.permissionDenied:
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case EmergencyStatus.countryUnknown:
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return _StatusMessage(
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message: l10n.countryUnknownMessage,
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retryLabel: l10n.retryButton,
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selectCountryLabel: l10n.selectCountryButton,
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onRetry: () => context.read<EmergencyProvider>().retry(),
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onSelectCountry: () => _openCountryPicker(context),
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);
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case EmergencyStatus.ready:
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final country = provider.country;
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if (country == null) {
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return _StatusMessage(message: l10n.countryNotInDatabaseMessage);
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}
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return _CountryContent(country: country);
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}
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}
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@override
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Widget build(BuildContext context) {
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final provider = context.watch<EmergencyProvider>();
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final l10n = AppLocalizations.of(context)!;
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return Scaffold(
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appBar: AppBar(
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title: Text(l10n.appTitle),
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actions: [
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IconButton(
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key: const Key('countryPickerButton'),
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icon: const Icon(Icons.public),
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tooltip: l10n.selectCountryButton,
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onPressed: () => _openCountryPicker(context),
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),
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],
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),
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body: SafeArea(
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child: Padding(
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padding: const EdgeInsets.symmetric(horizontal: 16),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.stretch,
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children: [
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if (_showPanicButton(provider))
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EmergencyButton(
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key: const Key('panicButton'),
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emergencyNumber: _panicNumber,
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),
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Expanded(child: _buildContent(context, provider)),
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],
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),
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),
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),
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);
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}
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}
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/// Kurzer Hinweistext für Fehler-/Unknown-/Fallback-Zustände, optional mit
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/// "Erneut versuchen"-Button.
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class _StatusMessage extends StatelessWidget {
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const _StatusMessage({
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required this.message,
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this.retryLabel,
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this.selectCountryLabel,
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this.onRetry,
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this.onSelectCountry,
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});
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final String message;
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final String? retryLabel;
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final String? selectCountryLabel;
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final VoidCallback? onRetry;
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/// Öffnet den `CountryPickerScreen`, damit der Nutzer sein Land manuell
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/// auswählen kann, wenn es nicht automatisch ermittelbar war (Plan
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/// Abschnitt 7, "Land nicht ermittelbar → Panik-Button + Länder-Suchfeld").
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final VoidCallback? onSelectCountry;
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@override
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Widget build(BuildContext context) {
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return Center(
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child: Padding(
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padding: const EdgeInsets.all(16),
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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Text(message, textAlign: TextAlign.center),
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if (onRetry != null) ...[
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const SizedBox(height: 12),
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ElevatedButton(onPressed: onRetry, child: Text(retryLabel!)),
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],
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if (onSelectCountry != null) ...[
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const SizedBox(height: 12),
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TextButton.icon(
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onPressed: onSelectCountry,
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icon: const Icon(Icons.public),
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label: Text(selectCountryLabel!),
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),
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],
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],
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),
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),
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);
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}
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}
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/// Länder-Header + sortierte Liste der landesspezifischen Notruf-Buttons.
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class _CountryContent extends StatelessWidget {
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const _CountryContent({required this.country});
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final Country country;
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@override
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Widget build(BuildContext context) {
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// general zuoberst, danach der Rest in JSON-Reihenfolge.
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final numbers = [
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...country.numbers.where((n) => n.type == EmergencyType.general),
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...country.numbers.where((n) => n.type != EmergencyType.general),
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];
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return Column(
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crossAxisAlignment: CrossAxisAlignment.stretch,
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children: [
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CountryHeader(country: country),
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Expanded(
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child: ListView.builder(
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itemCount: numbers.length,
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itemBuilder: (context, index) {
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final number = numbers[index];
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return EmergencyButton(
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key: ValueKey(number.type),
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emergencyNumber: number,
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);
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},
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),
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),
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],
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);
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}
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}
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