Alter message to show when the alarm is set for. Try fixing the alarm for Linux.

lib/main.dart

@@ -8,6 +8,8 @@ import 'package:timezone/timezone.dart' as tz;
 import 'package:http/http.dart' as http;
 import 'dart:convert';
 
+import 'dart:io';
+
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
   tz.initializeTimeZones();
@@ -160,6 +162,8 @@ class _HomeScreenState extends State<HomeScreen> {
     }
   }
 
+  Timer? _alarmTimer;
+
   Future<void> _scheduleAlarm() async {
     final sunsetText = _sunsetController.text.trim();
     if (sunsetText.isEmpty) return;
@@ -175,7 +179,6 @@ class _HomeScreenState extends State<HomeScreen> {
     if (alarmTime.isBefore(now)) {
       alarmTime = alarmTime.add(const Duration(days: 1));
     }
-
     alarmTime = alarmTime.subtract(Duration(minutes: _minutesBefore));
 
     if (alarmTime.isBefore(now)) {
@@ -183,8 +186,29 @@ class _HomeScreenState extends State<HomeScreen> {
       alarmTime = alarmTime.add(const Duration(days: 1));
     }
 
+    if (Platform.isLinux) {
+      // Linux: use a Timer (app must stay open)
+      _alarmTimer?.cancel();
+      final delay = alarmTime.difference(now);
+      _alarmTimer = Timer(delay, () {
+        const linuxDetails = LinuxNotificationDetails(
+          urgency: LinuxNotificationUrgency.critical,
+          resident: true,
+          timeout: LinuxNotificationTimeout.expiresNever(),
+        );
+        _notifications.show(
+          _alarmId,
+          'Sunset in ${_minutesBefore} min',
+          'The sun sets at $sunsetText. Time to get ready!',
+          const NotificationDetails(linux: linuxDetails),
+        );
+      });
+      _showSnack(
+        'Alarm set for ${alarmTime.hour.toString().padLeft(2, '0')}:${alarmTime.minute.toString().padLeft(2, '0')} (app must stay open)',
+      );
+    } else {
+      // Android: use zonedSchedule (works in background)
       final tzAlarm = tz.TZDateTime.from(alarmTime, tz.local);
-
       const androidDetails = AndroidNotificationDetails(
         'sunset_alarm',
         'Sunset Alarm',
@@ -194,22 +218,18 @@ class _HomeScreenState extends State<HomeScreen> {
         fullScreenIntent: true,
         category: AndroidNotificationCategory.alarm,
       );
-    const iosDetails = DarwinNotificationDetails(
-      presentAlert: true,
-      presentBadge: true,
-      presentSound: true,
-    );
-
       await _notifications.zonedSchedule(
         _alarmId,
         'Sunset in ${_minutesBefore} min',
         'The sun sets at $sunsetText. Time to get ready!',
         tzAlarm,
-      NotificationDetails(android: androidDetails, iOS: iosDetails),
+        const NotificationDetails(android: androidDetails),
         androidScheduleMode: AndroidScheduleMode.alarmClock,
         uiLocalNotificationDateInterpretation:
             UILocalNotificationDateInterpretation.absoluteTime,
       );
+      _showSnack('Alarm scheduled.');
+    }
   }
 
   Future<void> _toggleAlarm(bool value) async {
@@ -217,9 +237,11 @@ class _HomeScreenState extends State<HomeScreen> {
     await _savePrefs();
     if (value) {
       await _scheduleAlarm();
-      _showSnack('Alarm scheduled.');
     } else {
+      _alarmTimer?.cancel();
+      if (!Platform.isLinux) {
         await _notifications.cancel(_alarmId);
+      }
       _showSnack('Alarm cancelled.');
     }
   }
@@ -353,8 +375,7 @@ class _HomeScreenState extends State<HomeScreen> {
                     },
                   ),
                 ),
-              ],
+
-            ),
                 const SizedBox(height: 24),
 
                 // --- Toggle ---
@@ -362,7 +383,7 @@ class _HomeScreenState extends State<HomeScreen> {
                   title: const Text('Enable Sunset Alarm'),
                   subtitle: Text(
                     _alarmEnabled
-                    ? 'Will alert ${_minutesBefore} min before sunset'
+                        ? 'Will alert ${_minutesBefore} min before sunset. ($_alarmDisplayTime)'
                         : 'Alarm is off',
                   ),
                   value: _alarmEnabled,
@@ -370,7 +391,24 @@ class _HomeScreenState extends State<HomeScreen> {
                 ),
               ],
             ),
+          ],
+        ),
       ),
     );
   }
+
+  String get _alarmDisplayTime {
+    final sunsetText = _sunsetController.text.trim();
+    if (sunsetText.isEmpty) return '—';
+    final parts = sunsetText.split(':');
+    if (parts.length < 2) return '—';
+    final h = int.tryParse(parts[0]);
+    final m = int.tryParse(parts[1]);
+    if (h == null || m == null) return '—';
+    final alarmMinutes = h * 60 + m - _minutesBefore;
+    final displayMin = alarmMinutes % (24 * 60);
+    final dh = (displayMin ~/ 60) % 24;
+    final dm = displayMin % 60;
+    return '${dh.toString().padLeft(2, '0')}:${dm.toString().padLeft(2, '0')}';
+  }
 }