????

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

@@ -1,6 +1,22 @@
 import 'package:flutter_local_notifications/flutter_local_notifications.dart';
+import 'package:timezone/data/latest.dart';
+import 'package:timezone/timezone.dart';
 
-void sendNotification() async {
+const details = NotificationDetails(
+  android: AndroidNotificationDetails(
+    'hrt',
+    'HRT',
+    autoCancel: false,
+    styleInformation: BigPictureStyleInformation(
+      DrawableResourceAndroidBitmap('take_your_hrt'),
+    ),
+    importance: Importance.max,
+    ongoing: true,
+    actions: [AndroidNotificationAction("confirmation", "Done!")],
+  ),
+);
+
+void _initializePlugin() async {
   var initialized = await FlutterLocalNotificationsPlugin().initialize(
     const InitializationSettings(
       android: AndroidInitializationSettings('estrogen'),
@@ -10,23 +26,60 @@ void sendNotification() async {
   if (initialized != true) {
     throw "Not initialized";
   }
+}
 
+void sendNotification() async {
+  _initializePlugin();
   await FlutterLocalNotificationsPlugin().show(
     1,
     null,
     null,
-    const NotificationDetails(
-      android: AndroidNotificationDetails(
-        'hrt',
-        'HRT',
-        autoCancel: false,
-        styleInformation: BigPictureStyleInformation(
-          DrawableResourceAndroidBitmap('take_your_hrt'),
-        ),
-        importance: Importance.max,
-        ongoing: true,
-        actions: [AndroidNotificationAction("confirmation", "Done!")],
-      ),
-    ),
+    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,
   );
 }