????

android/app/src/main/AndroidManifest.xml

@@ -1,4 +1,7 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
+    <uses-permission android:name="android.permission.VIBRATE" />
+    <uses-permission android:name="android.permission.WAKE_LOCK" />
     <application
         android:label="hrt"
         android:name="${applicationName}"

lib/notification.dart

@@ -1,21 +1,8 @@
 import 'package:flutter_local_notifications/flutter_local_notifications.dart';
+import 'package:timezone/data/latest.dart';
+import 'package:timezone/timezone.dart';
 
-void sendNotification() async {
-  var initialized = await FlutterLocalNotificationsPlugin().initialize(
-    const InitializationSettings(
-      android: AndroidInitializationSettings('estrogen'),
-    ),
-  );
-
-  if (initialized != true) {
-    throw "Not initialized";
-  }
-
-  await FlutterLocalNotificationsPlugin().show(
-    1,
-    null,
-    null,
-    const NotificationDetails(
+const details = NotificationDetails(
   android: AndroidNotificationDetails(
     'hrt',
     'HRT',
@@ -27,6 +14,72 @@ void sendNotification() async {
     ongoing: true,
     actions: [AndroidNotificationAction("confirmation", "Done!")],
   ),
+);
+
+void _initializePlugin() async {
+  var initialized = await FlutterLocalNotificationsPlugin().initialize(
+    const InitializationSettings(
+      android: AndroidInitializationSettings('estrogen'),
     ),
   );
+
+  if (initialized != true) {
+    throw "Not initialized";
+  }
+}
+
+void sendNotification() async {
+  _initializePlugin();
+  await FlutterLocalNotificationsPlugin().show(
+    1,
+    null,
+    null,
+    details,
+  );
+}
+
+void scheduleNotification() async {
+  _initializePlugin();
+  initializeTimeZones();
+
+  // [Hours, Minutes]
+  var times = [
+    [12, 00],
+    [18, 00],
+  ];
+
+  if (times.isEmpty) return;
+
+  var currentTime = TZDateTime.now(local);
+
+  // Map the time entries to TZDateTime objects
+  var notificationTimes = times
+      .map((item) => TZDateTime(
+            local,
+            currentTime.year,
+            currentTime.month,
+            currentTime.day,
+            item[0],
+            item[1],
+          ))
+      .toList();
+
+  // For all entries in the past, add 1 day
+  for (var time in notificationTimes
+      .where((element) => element.compareTo(currentTime) < 0)) {
+    time.add(const Duration(days: 1));
+  }
+
+  // Sort the array so we can find the closest time
+  notificationTimes.sort((a, b) => a.compareTo(b));
+
+  await FlutterLocalNotificationsPlugin().zonedSchedule(
+    1,
+    null,
+    null,
+    notificationTimes[0],
+    details,
+    uiLocalNotificationDateInterpretation:
+        UILocalNotificationDateInterpretation.absoluteTime,
+  );
 }