send notifications natively

lib/controllers/notifications.dart

@@ -0,0 +1,97 @@
+import "dart:io";
+
+import "package:flutter_local_notifications/flutter_local_notifications.dart";
+import "package:flutter_riverpod/flutter_riverpod.dart";
+
+class NotificationsController
+    extends AsyncNotifier<FlutterLocalNotificationsPlugin> {
+  @override
+  Future<FlutterLocalNotificationsPlugin> build() async {
+    final notifications = FlutterLocalNotificationsPlugin();
+
+    final darwin = DarwinInitializationSettings();
+
+    await notifications.initialize(
+      settings: .new(
+        windows: .new(
+          appName: "Nexus",
+          appUserModelId: "nexus.federated.nexus",
+          guid: "dde78daf-130f-4e46-a80a-e31deeab45d7",
+        ),
+        android: .new("ic_launcher"),
+        iOS: darwin,
+        macOS: darwin,
+        linux: .new(defaultActionName: "Open"),
+      ),
+      onDidReceiveNotificationResponse: (details) {
+        print(details.data);
+      },
+    );
+
+    return notifications;
+  }
+
+  Future<bool> requestPermissions() async {
+    final controller = await future;
+
+    if (Platform.isIOS) {
+      return await controller
+              .resolvePlatformSpecificImplementation<
+                IOSFlutterLocalNotificationsPlugin
+              >()
+              ?.requestPermissions(alert: true, badge: true, sound: true) ??
+          true;
+    } else if (Platform.isMacOS) {
+      return await controller
+              .resolvePlatformSpecificImplementation<
+                MacOSFlutterLocalNotificationsPlugin
+              >()
+              ?.requestPermissions(alert: true, badge: true, sound: true) ??
+          true;
+    } else if (Platform.isAndroid) {
+      return await controller
+              .resolvePlatformSpecificImplementation<
+                AndroidFlutterLocalNotificationsPlugin
+              >()
+              ?.requestNotificationsPermission() ??
+          true;
+    }
+
+    return true;
+  }
+
+  Future<void> send({
+    required int id,
+    required String title,
+    String? body,
+    File? icon,
+    String? payload,
+  }) async {
+    final notificationDetails = NotificationDetails(
+      android: .new(
+        "messages",
+        "Messages",
+        largeIcon: icon == null ? null : FilePathAndroidBitmap(icon.path),
+      ),
+      iOS: .new(),
+      macOS: .new(),
+      linux: .new(icon: icon == null ? null : FilePathLinuxIcon(icon.path)),
+      windows: .new(),
+    );
+
+    final controller = await future;
+    await controller.show(
+      id: id,
+      title: title,
+      body: body,
+      notificationDetails: notificationDetails,
+      payload: payload,
+    );
+  }
+
+  static final provider =
+      AsyncNotifierProvider<
+        NotificationsController,
+        FlutterLocalNotificationsPlugin
+      >(NotificationsController.new);
+}