Optimize automatic updates

lib/services/update_service.dart

@@ -9,10 +9,12 @@ import 'package:path_provider/path_provider.dart';
 import 'package:url_launcher/url_launcher.dart';
 import 'package:xml/xml.dart';
 
+import '../core/constants/storage_keys.dart';
 import '../core/utils/app_logger.dart';
 import '../data/models/app_update_model.dart';
+import 'storage_service.dart';
 
-class UpdateService {
+class UpdateService extends ChangeNotifier {
   UpdateService._();
 
   static final UpdateService instance = UpdateService._();
@@ -23,6 +25,9 @@ class UpdateService {
   static final Uri releasesPageUrl = Uri.parse(
     'https://git.saont.net/gongyun/app/releases',
   );
+  static final Uri downloadsPageUrl = Uri.parse(
+    'https://www.gongyun.org/downloads.html',
+  );
 
   final Dio _dio = Dio(
     BaseOptions(
@@ -34,17 +39,24 @@ class UpdateService {
   );
 
   bool _checking = false;
+  AppUpdateInfo? _availableUpdate;
+
+  AppUpdateInfo? get availableUpdate => _availableUpdate;
+  bool get hasUpdate => _availableUpdate != null;
 
   Future<AppUpdateInfo?> checkForUpdate() async {
     if (_checking) return null;
-    if (!_supportsAutoDownload) return null;
 
     _checking = true;
     try {
       final current = await PackageInfo.fromPlatform();
       final latest = await _fetchLatestRelease(currentVersion: current.version);
-      if (latest == null) return null;
-      if (_compareVersions(latest.version, current.version) <= 0) return null;
+      if (latest == null ||
+          _compareVersions(latest.version, current.version) <= 0) {
+        _setAvailableUpdate(null);
+        return null;
+      }
+      _setAvailableUpdate(latest);
       return latest;
     } catch (e, stackTrace) {
       AppLogger.e('检查更新失败: $e\n$stackTrace');
@@ -54,6 +66,34 @@ class UpdateService {
     }
   }
 
+  Future<bool> shouldShowPrompt(AppUpdateInfo update) async {
+    final storage = StorageService.instance;
+    final skipVersion = await storage.getString(
+      StorageKeys.updatePromptSkipVersion,
+    );
+    final skipUntil = await storage.getInt(StorageKeys.updatePromptSkipUntil);
+    if (skipVersion != update.version || skipUntil == null) return true;
+
+    final now = DateTime.now().millisecondsSinceEpoch;
+    if (skipUntil > now) return false;
+
+    await storage.remove(StorageKeys.updatePromptSkipUntil);
+    await storage.remove(StorageKeys.updatePromptSkipVersion);
+    return true;
+  }
+
+  Future<void> skipPromptForFiveDays(AppUpdateInfo update) async {
+    final skipUntil = DateTime.now()
+        .add(const Duration(days: 5))
+        .millisecondsSinceEpoch;
+    final storage = StorageService.instance;
+    await storage.setString(
+      StorageKeys.updatePromptSkipVersion,
+      update.version,
+    );
+    await storage.setInt(StorageKeys.updatePromptSkipUntil, skipUntil);
+  }
+
   Future<File?> downloadUpdate(
     AppUpdateInfo update, {
     void Function(int received, int total)? onProgress,
@@ -96,6 +136,15 @@ class UpdateService {
     }
   }
 
+  Future<void> openDownloadsPage() async {
+    if (!await launchUrl(
+      downloadsPageUrl,
+      mode: LaunchMode.externalApplication,
+    )) {
+      throw Exception('无法打开下载页面: $downloadsPageUrl');
+    }
+  }
+
   Future<AppUpdateInfo?> _fetchLatestRelease({String? currentVersion}) async {
     final response = await _dio.getUri<String>(releasesRssUrl);
     final body = response.data;
@@ -119,7 +168,6 @@ class UpdateService {
       final update = await _buildUpdateInfo(release);
       if (update == null) continue;
 
-      if (update.downloadUrl == null) continue;
       return update;
     }
 
@@ -206,8 +254,6 @@ class UpdateService {
     return null;
   }
 
-  bool get _supportsAutoDownload => Platform.isAndroid || Platform.isWindows;
-
   bool _isReleaseAttachment(Uri uri) {
     return uri.path.contains('/releases/download/');
   }
@@ -345,6 +391,16 @@ class UpdateService {
     return Uri.decodeComponent(segment);
   }
 
+  void _setAvailableUpdate(AppUpdateInfo? update) {
+    final previous = _availableUpdate;
+    if (previous?.version == update?.version &&
+        previous?.pageUrl == update?.pageUrl) {
+      return;
+    }
+    _availableUpdate = update;
+    notifyListeners();
+  }
+
   @visibleForTesting
   Future<AppUpdateInfo?> debugFetchLatestRelease() => _fetchLatestRelease();
 }