feat: show notification and battery optimization warning

mobile/lib/providers/permission.provider.dart

@@ -0,0 +1,73 @@
+import 'dart:async';
+import 'dart:io';
+
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:immich_mobile/platform/permission_api.g.dart' as pm;
+import 'package:immich_mobile/providers/infrastructure/platform.provider.dart';
+import 'package:permission_handler/permission_handler.dart';
+
+class NotificationPermissionNotifier extends StateNotifier<PermissionStatus> {
+  NotificationPermissionNotifier()
+    : super(Platform.isAndroid ? PermissionStatus.granted : PermissionStatus.restricted) {
+    // Sets the initial state
+    getNotificationPermission().then((p) => state = p);
+  }
+
+  /// Requests the notification permission
+  /// Note: In Android, this is always granted
+  Future<PermissionStatus> requestNotificationPermission() async {
+    final permission = await Permission.notification.request();
+    state = permission;
+    return permission;
+  }
+
+  /// Whether the user has the permission or not
+  /// Note: In Android, this is always true
+  Future<bool> hasNotificationPermission() {
+    return Permission.notification.isGranted;
+  }
+
+  Future<PermissionStatus> getNotificationPermission() async {
+    final status = await Permission.notification.status;
+    state = status;
+    return status;
+  }
+
+  /// Either the permission was granted already or else ask for the permission
+  Future<bool> hasOrAskForNotificationPermission() {
+    return requestNotificationPermission().then((p) => p.isGranted);
+  }
+}
+
+final notificationPermissionProvider = StateNotifierProvider<NotificationPermissionNotifier, PermissionStatus>(
+  (ref) => NotificationPermissionNotifier(),
+);
+
+final batteryOptimizationProvider = AsyncNotifierProvider<BatteryOptimizationNotifier, PermissionStatus>(
+  BatteryOptimizationNotifier.new,
+);
+
+class BatteryOptimizationNotifier extends AsyncNotifier<PermissionStatus> {
+  Future<PermissionStatus> getBatteryOptimizationPermission() async {
+    final PermissionStatus status;
+    final isIgnoring = await ref.read(permissionApiProvider).isIgnoringBatteryOptimizations().then((p) => p.toStatus());
+    if (isIgnoring == PermissionStatus.granted) {
+      status = PermissionStatus.granted;
+    } else {
+      status = PermissionStatus.denied;
+    }
+    state = AsyncValue.data(status);
+    return status;
+  }
+
+  @override
+  FutureOr<PermissionStatus> build() => getBatteryOptimizationPermission();
+}
+
+extension on pm.PermissionStatus {
+  PermissionStatus toStatus() => switch (this) {
+    pm.PermissionStatus.granted => PermissionStatus.granted,
+    pm.PermissionStatus.denied => PermissionStatus.denied,
+    pm.PermissionStatus.permanentlyDenied => PermissionStatus.permanentlyDenied,
+  };
+}