Add fingerprint (local_auth) session + 3-min inactivity timeout (default), activity resets timer, settings: biometric toggle + timeout picker

lib/settings_screen.dart

@@ -4,7 +4,8 @@ import 'package:flutter/services.dart';
 import 'package:login_vault_app/auth_service.dart';
 import 'package:login_vault_app/theme_provider.dart';
 
-/// Settings: change app password, switch theme (dark/system), and Exit.
+/// Settings: change app password, switch theme (dark/system), session timeout,
+/// fingerprint toggle, and Exit.
 class SettingsScreen extends StatefulWidget {
   final AuthService auth;
   final ThemeProvider theme;
@@ -18,6 +19,30 @@ class _SettingsScreenState extends State<SettingsScreen> {
   final _oldCtrl = TextEditingController();
   final _newCtrl = TextEditingController();
   String? _msg;
+  bool _biometricOn = false;
+  bool _biometricAvailable = false;
+  int _timeout = 3;
+
+  final List<int> _timeoutOptions = [3, 5, 10, 15, 30, 60, 0];
+
+  @override
+  void initState() {
+    super.initState();
+    _loadSettings();
+  }
+
+  Future<void> _loadSettings() async {
+    final on = await widget.auth.isBiometricEnabled();
+    final avail = await widget.auth.canUseBiometrics();
+    final t = await widget.auth.getTimeoutMinutes();
+    if (mounted) {
+      setState(() {
+        _biometricOn = on && avail;
+        _biometricAvailable = avail;
+        _timeout = t;
+      });
+    }
+  }
 
   Future<void> _changePassword() async {
     final oldP = _oldCtrl.text;
@@ -37,6 +62,31 @@ class _SettingsScreenState extends State<SettingsScreen> {
     _newCtrl.clear();
   }
 
+  Future<void> _toggleBiometric(bool value) async {
+    if (value && !_biometricAvailable) {
+      setState(() => _msg = 'Perangkat tidak mendukung sidik jari');
+      return;
+    }
+    if (value) {
+      final ok = await widget.auth.authenticateWithBiometrics();
+      if (!ok) {
+        setState(() => _msg = 'Verifikasi sidik jari gagal');
+        return;
+      }
+    }
+    await widget.auth.setBiometricEnabled(value);
+    if (mounted) setState(() => _biometricOn = value);
+  }
+
+  Future<void> _setTimeout(int? value) async {
+    if (value == null) return;
+    await widget.auth.setTimeoutMinutes(value);
+    if (mounted) setState(() => _timeout = value);
+    widget.auth.openSession(); // activity
+  }
+
+  String _timeoutLabel(int m) => m == 0 ? 'Selamanya' : '$m menit';
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
@@ -44,8 +94,7 @@ class _SettingsScreenState extends State<SettingsScreen> {
       body: ListView(
         padding: const EdgeInsets.all(16),
         children: [
-          const Text('Tema',
-              style: TextStyle(fontWeight: FontWeight.bold)),
+          const Text('Tema', style: TextStyle(fontWeight: FontWeight.bold)),
           ListTile(
             title: const Text('Gelap (Dark)'),
             leading: const Icon(Icons.dark_mode),
@@ -67,6 +116,27 @@ class _SettingsScreenState extends State<SettingsScreen> {
             onTap: () => widget.theme.setMode(ThemeMode.system),
           ),
           const Divider(),
+          const Text('Session', style: TextStyle(fontWeight: FontWeight.bold)),
+          ListTile(
+            title: const Text('Timeout (tanpa aktivitas)'),
+            subtitle: Text('Logout otomatis setelah: ${_timeoutLabel(_timeout)}'),
+            trailing: DropdownButton<int>(
+              value: _timeout,
+              items: _timeoutOptions
+                  .map((m) => DropdownMenuItem(value: m, child: Text(_timeoutLabel(m))))
+                  .toList(),
+              onChanged: _setTimeout,
+            ),
+          ),
+          SwitchListTile(
+            title: const Text('Login dengan sidik jari'),
+            subtitle: Text(_biometricAvailable
+                ? 'Gunakan fingerprint untuk membuka app'
+                : 'Perangkat tidak mendukung biometrik'),
+            value: _biometricOn,
+            onChanged: _toggleBiometric,
+          ),
+          const Divider(),
           const Text('Ubah Password Aplikasi',
               style: TextStyle(fontWeight: FontWeight.bold)),
           TextField(
@@ -87,15 +157,14 @@ class _SettingsScreenState extends State<SettingsScreen> {
           if (_msg != null)
             Padding(
               padding: const EdgeInsets.only(top: 8),
-              child: Text(_msg!,
-                  style: const TextStyle(color: Colors.green)),
+              child: Text(_msg!, style: const TextStyle(color: Colors.green)),
             ),
           const Divider(),
           ListTile(
             leading: const Icon(Icons.exit_to_app),
             title: const Text('Keluar (Exit)'),
-            onTap: () {
-              // On Android, pop the whole stack then ask the system to close.
+            onTap: () async {
+              await widget.auth.closeSession();
               Navigator.of(context).popUntil((r) => r.isFirst);
               if (Platform.isAndroid) {
                 SystemNavigator.pop();