refactor(neon): make NeonPlatform an interface

packages/neon/neon/lib/src/platform/android.dart

@@ -5,22 +5,44 @@ import 'package:path/path.dart' as p;
 import 'package:path_provider/path_provider.dart';
 import 'package:permission_handler/permission_handler.dart';
 
+@immutable
 @internal
-class AndroidNeonPlatform extends NeonPlatform {
+class AndroidNeonPlatform implements NeonPlatform {
-  AndroidNeonPlatform()
+  const AndroidNeonPlatform();
-      : super(
+
-          canUseWebView: true,
+  @override
-          canUseQuickActions: true,
+  bool get canUseCamera => true;
-          canUseSystemTray: false,
+
-          canUseWindowManager: false,
+  @override
-          canUseCamera: true,
+  bool get canUsePushNotifications => true;
-          canUsePushNotifications: true,
+
-          getApplicationCachePath: () async => (await getTemporaryDirectory()).absolute.path,
+  @override
-          getUserAccessibleAppDataPath: () async {
+  bool get canUseQuickActions => true;
+
+  @override
+  bool get canUseSystemTray => false;
+
+  @override
+  bool get canUseWebView => true;
+
+  @override
+  bool get canUseWindowManager => false;
+
+  @override
+  Future<String> getApplicationCachePath() async {
+    final tempDir = await getTemporaryDirectory();
+    return tempDir.absolute.path;
+  }
+
+  @override
+  Future<String> getUserAccessibleAppDataPath() async {
     if (!await Permission.storage.request().isGranted) {
       throw MissingPermissionException(Permission.storage);
     }
+
     return p.join((await getExternalStorageDirectory())!.path);
-          },
+  }
-        );
+
+  @override
+  void init() {}
 }

packages/neon/neon/lib/src/platform/linux.dart

@@ -6,24 +6,41 @@ import 'package:path/path.dart' as p;
 import 'package:sqflite_common_ffi/sqflite_ffi.dart';
 import 'package:xdg_directories/xdg_directories.dart' as xdg;
 
+@immutable
 @internal
-class LinuxNeonPlatform extends NeonPlatform {
+class LinuxNeonPlatform implements NeonPlatform {
-  LinuxNeonPlatform()
+  const LinuxNeonPlatform();
-      : super(
+
-          canUseWebView: false,
+  @override
-          canUseQuickActions: false,
+  bool get canUseWebView => false;
-          canUseSystemTray: true,
+
-          canUseWindowManager: true,
+  @override
-          canUseCamera: false,
+  bool get canUseQuickActions => false;
-          canUsePushNotifications: false,
+
-          getApplicationCachePath: () async => p.join(
+  @override
+  bool get canUseSystemTray => true;
+
+  @override
+  bool get canUseWindowManager => true;
+
+  @override
+  bool get canUseCamera => false;
+
+  @override
+  bool get canUsePushNotifications => false;
+
+  @override
+  String getApplicationCachePath() => p.join(
         xdg.cacheHome.absolute.path,
         'de.provokateurin.neon',
-          ),
+      );
-          getUserAccessibleAppDataPath: () async => p.join(Platform.environment['HOME']!, 'Neon'),
+
-          init: () async {
+  @override
+  String getUserAccessibleAppDataPath() => p.join(Platform.environment['HOME']!, 'Neon');
+
+  @override
+  void init() {
     sqfliteFfiInit();
     databaseFactory = databaseFactoryFfi;
-          },
+  }
-        );
 }

packages/neon/neon/lib/src/platform/platform.dart

@@ -1,53 +1,41 @@
+import 'dart:async';
 import 'dart:io';
 
+import 'package:meta/meta.dart';
 import 'package:neon/src/platform/android.dart';
 import 'package:neon/src/platform/linux.dart';
 
 Future<NeonPlatform> getNeonPlatform() async {
-  NeonPlatform? platform;
+  final NeonPlatform platform;
   if (Platform.isAndroid) {
-    platform = AndroidNeonPlatform();
+    platform = const AndroidNeonPlatform();
-  }
+  } else if (Platform.isLinux) {
-  if (Platform.isLinux) {
+    platform = const LinuxNeonPlatform();
-    platform = LinuxNeonPlatform();
+  } else {
-  }
-
-  if (platform == null) {
     throw UnimplementedError('No implementation for platform ${Platform.operatingSystem} found');
   }
 
-  await platform.init?.call();
+  await platform.init.call();
   return platform;
 }
 
-abstract class NeonPlatform {
+@immutable
-  NeonPlatform({
+abstract interface class NeonPlatform {
-    required this.canUseWebView,
+  abstract final bool canUseWebView;
-    required this.canUseQuickActions,
-    required this.canUseSystemTray,
-    required this.canUseWindowManager,
-    required this.canUseCamera,
-    required this.canUsePushNotifications,
-    required this.getApplicationCachePath,
-    required this.getUserAccessibleAppDataPath,
-    this.init,
-  });
-
-  final bool canUseWebView;
 
-  final bool canUseQuickActions;
+  abstract final bool canUseQuickActions;
 
-  final bool canUseSystemTray;
+  abstract final bool canUseSystemTray;
 
-  final bool canUseWindowManager;
+  abstract final bool canUseWindowManager;
 
-  final bool canUseCamera;
+  abstract final bool canUseCamera;
 
-  final bool canUsePushNotifications;
+  abstract final bool canUsePushNotifications;
 
-  final Future<String> Function() getApplicationCachePath;
+  FutureOr<String> getApplicationCachePath();
 
-  final Future<String> Function() getUserAccessibleAppDataPath;
+  FutureOr<String> getUserAccessibleAppDataPath();
 
-  final Future Function()? init;
+  FutureOr init();
 }