Notifications

lib/main.dart

@@ -1,9 +1,72 @@
 import 'package:flutter/material.dart';
+import 'package:todoapp/elems/filehandler.dart';
 import 'package:todoapp/pages/Home.dart';
 import 'package:provider/provider.dart';
 import 'package:todoapp/providers/todoprovider.dart';
+import 'package:awesome_notifications/awesome_notifications.dart';
+import 'package:workmanager/workmanager.dart';
+import 'package:disable_battery_optimization/disable_battery_optimization.dart';
+
+@pragma('vm:entry-point')
+void callbackDispatcher() {
+  Workmanager().executeTask((task, inputData) async {
+    AwesomeNotifications().initialize(
+        null,
+        [
+          NotificationChannel(
+              channelKey: "reminder_channel",
+              channelName: "Reminders",
+              channelDescription: "Reminder for ToDo")
+        ]);
+
+    Map content = await FileHandler.fileContent;
+    for (String key in content.keys) {
+      Map list = content[key];
+      for (String title in list.keys) {
+        Map current = list[title];
+        DateTime dueTime = DateTime.parse(current["dueTime"]);
+        bool checked = current["checked"];
+        DateTime currentTime = DateTime.now();
+        int timeDiff = dueTime
+            .difference(currentTime)
+            .inMinutes;
+        if (timeDiff <= 30 && timeDiff >= 0 && !checked) {
+          AwesomeNotifications().createNotification(
+              content: NotificationContent(
+                  id: 10,
+                  channelKey: "reminder_channel",
+                  title: "Task due!",
+                  body: "Task $title due in $timeDiff minutes!"
+              )
+          );
+        }
+      }
+    }
+    return Future.value(true);
+  });
+}
+
+
+void main() async {
+
+
+  AwesomeNotifications().initialize(
+      null,
+      [
+        NotificationChannel(
+            channelKey: "reminder_channel",
+            channelName: "Reminders",
+            channelDescription: "Reminder for ToDo")
+      ]);
+
+  Workmanager().initialize(
+      callbackDispatcher,
+      isInDebugMode: true
+  );
+
+  Workmanager().registerPeriodicTask("check_nots", "nots_check", frequency: Duration(minutes: 15));
+  // Workmanager().registerOneOffTask("test", "test1");
 
-void main() {
   runApp(const MyApp());
 }
 
@@ -13,9 +76,7 @@ class MyApp extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return MultiProvider(
-      providers: [
-        ChangeNotifierProvider(create: (context) => TodoProvider())
-      ],
+      providers: [ChangeNotifierProvider(create: (context) => TodoProvider())],
       child: MaterialApp(
         theme: ThemeData(
           colorScheme: ColorScheme.fromSeed(