feat(home): Delete legacy v0 data

lib/features/home/cubit/init_cubit.dart

@@ -0,0 +1,37 @@
+import 'dart:io';
+
+import 'package:bloc/bloc.dart';
+import 'package:dart_mappable/dart_mappable.dart';
+import 'package:path_provider/path_provider.dart';
+
+part '../../../generated/features/home/cubit/init_cubit.mapper.dart';
+part 'init_state.dart';
+
+/// Cubit to do some initializing work during app start.
+final class InitCubit extends Cubit<InitState> {
+  /// Constructor.
+  InitCubit() : super(const InitState());
+
+  /// Delete legacy data used in version v0.x.
+  Future<void> deleteV0LegacyData() async {
+    final v0IsarDb =
+        File('${(await getApplicationSupportDirectory()).path}/db/main.isar');
+    if (!v0IsarDb.existsSync()) {
+      return;
+    }
+    await v0IsarDb.delete();
+
+    final v0IsarDbLock = File('${v0IsarDb.path}-lck');
+    if (v0IsarDbLock.existsSync()) {
+      await v0IsarDbLock.delete();
+    }
+
+    final v0ImageCacheDir =
+        Directory('${(await getApplicationCacheDirectory()).path}/images');
+    if (v0ImageCacheDir.existsSync()) {
+      await v0ImageCacheDir.list(recursive: true).forEach((e) => e.delete());
+    }
+
+    emit(state.copyWith(v0LegacyDataDeleted: true));
+  }
+}

lib/features/home/cubit/init_state.dart

@@ -0,0 +1,18 @@
+part of 'init_cubit.dart';
+
+/// Empty state placeholder.
+@MappableClass()
+final class InitState with InitStateMappable {
+  /// Constructor.
+  const InitState({
+    this.v0LegacyDataDeleted = false,
+  });
+
+  /// Flag indicating legacy data used before v1.0 found and deleted.
+  ///
+  /// Those data are not usable because we migrated our storage database from
+  /// isar to drift in version 1.0.
+  ///
+  /// So delete those data and also image cache.
+  final bool v0LegacyDataDeleted;
+}

lib/features/home/view/home_page.dart

@@ -4,11 +4,13 @@ import 'package:go_router/go_router.dart';
 import 'package:responsive_framework/responsive_framework.dart';
 import 'package:tsdm_client/constants/layout.dart';
 import 'package:tsdm_client/features/home/cubit/home_cubit.dart';
+import 'package:tsdm_client/features/home/cubit/init_cubit.dart';
 import 'package:tsdm_client/features/home/widgets/widgets.dart';
 import 'package:tsdm_client/features/settings/repositories/settings_repository.dart';
 import 'package:tsdm_client/generated/i18n/strings.g.dart';
 import 'package:tsdm_client/instance.dart';
 import 'package:tsdm_client/shared/repositories/forum_home_repository/forum_home_repository.dart';
+import 'package:tsdm_client/utils/show_dialog.dart';
 import 'package:tsdm_client/utils/show_toast.dart';
 
 const _drawerWidth = 250.0;
@@ -92,71 +94,91 @@ class _HomePageState extends State<HomePage> {
         ),
       );
 
+  Widget _buildContent(BuildContext context) {
+    final Widget child;
+    if (ResponsiveBreakpoints.of(context)
+        .largerThan(WindowSize.expanded.name)) {
+      child = _buildDrawerBody(context);
+    } else if (ResponsiveBreakpoints.of(context)
+        .largerThan(WindowSize.compact.name)) {
+      child = Scaffold(
+        body: Row(
+          children: [
+            if (widget.showNavigationBar) const HomeNavigationRail(),
+            Expanded(child: widget.child),
+          ],
+        ),
+      );
+    } else {
+      child = Scaffold(
+        body: widget.child,
+        bottomNavigationBar:
+            widget.showNavigationBar ? const HomeNavigationBar() : null,
+      );
+    }
+
+    return RepositoryProvider.value(
+      value: widget._forumHomeRepository,
+      child: BackButtonListener(
+        onBackButtonPressed: () async {
+          final doublePressExit =
+              getIt.get<SettingsRepository>().currentSettings.doublePressExit;
+          if (!doublePressExit) {
+            // Do NOT handle pop events on double press check is disabled.
+            return false;
+          }
+          if (!context.mounted) {
+            return false;
+          }
+
+          if (context.canPop()) {
+            // Do NOT handle pop events on other pages.
+            return false;
+          }
+          final tr = context.t.home;
+          final currentTime = DateTime.now();
+          if (lastPopTime == null ||
+              currentTime.difference(lastPopTime!).inMilliseconds >
+                  exitConfirmDuration.inMilliseconds) {
+            lastPopTime = currentTime;
+            ScaffoldMessenger.of(context).hideCurrentSnackBar();
+            showSnackBar(context: context, message: tr.confirmExit);
+            return true;
+          }
+          return false;
+        },
+        child: child,
+      ),
+    );
+  }
+
   @override
   Widget build(BuildContext context) {
     Translations.of(context);
-    return BlocProvider(
-      create: (_) => HomeCubit(),
-      child: Builder(
-        builder: (context) {
-          final Widget child;
-          if (ResponsiveBreakpoints.of(context)
-              .largerThan(WindowSize.expanded.name)) {
-            child = _buildDrawerBody(context);
-          } else if (ResponsiveBreakpoints.of(context)
-              .largerThan(WindowSize.compact.name)) {
-            child = Scaffold(
-              body: Row(
-                children: [
-                  if (widget.showNavigationBar) const HomeNavigationRail(),
-                  Expanded(child: widget.child),
-                ],
-              ),
-            );
-          } else {
-            child = Scaffold(
-              body: widget.child,
-              bottomNavigationBar:
-                  widget.showNavigationBar ? const HomeNavigationBar() : null,
-            );
+    return MultiBlocProvider(
+      providers: [
+        BlocProvider(
+          create: (_) => HomeCubit(),
+        ),
+        BlocProvider(
+          create: (context) => InitCubit()..deleteV0LegacyData(),
+        ),
+      ],
+      child: BlocListener<InitCubit, InitState>(
+        listenWhen: (prev, curr) =>
+            prev.v0LegacyDataDeleted != curr.v0LegacyDataDeleted,
+        listener: (context, state) {
+          if (state.v0LegacyDataDeleted != true) {
+            return;
           }
-
-          return RepositoryProvider.value(
-            value: widget._forumHomeRepository,
-            child: BackButtonListener(
-              onBackButtonPressed: () async {
-                final doublePressExit = getIt
-                    .get<SettingsRepository>()
-                    .currentSettings
-                    .doublePressExit;
-                if (!doublePressExit) {
-                  // Do NOT handle pop events on double press check is disabled.
-                  return false;
-                }
-                if (!context.mounted) {
-                  return false;
-                }
-
-                if (context.canPop()) {
-                  // Do NOT handle pop events on other pages.
-                  return false;
-                }
-                final tr = context.t.home;
-                final currentTime = DateTime.now();
-                if (lastPopTime == null ||
-                    currentTime.difference(lastPopTime!).inMilliseconds >
-                        exitConfirmDuration.inMilliseconds) {
-                  lastPopTime = currentTime;
-                  ScaffoldMessenger.of(context).hideCurrentSnackBar();
-                  showSnackBar(context: context, message: tr.confirmExit);
-                  return true;
-                }
-                return false;
-              },
-              child: child,
-            ),
+          final tr = context.t.init.v1DeleteLegacyData;
+          showMessageSingleButtonDialog(
+            context: context,
+            title: tr.title,
+            message: tr.detail,
           );
         },
+        child: _buildContent(context),
       ),
     );
   }

lib/i18n/strings.i18n.json

@@ -558,5 +558,11 @@
     "copyImageUrl": "Copy image url",
     "reloadImage": "ReloadImage",
     "openLink": "Open link"
+  },
+  "init": {
+    "v1DeleteLegacyData": {
+      "title": "Legacy data deleted",
+      "detail": "Seems this app have just upgraded from version older than 1.0, user login data and preferences are deleted because they are not usable any more.\nYou may need to login and set preferences once more. Sorry for inconvenience."
+    }
   }
 }

lib/i18n/strings_zh-CN.i18n.json

@@ -558,5 +558,11 @@
     "copyImageUrl": "复制图片链接",
     "reloadImage": "重新加载图片",
     "openLink": "打开链接"
+  },
+  "init": {
+    "v1DeleteLegacyData": {
+      "title": "旧数据已清除",
+      "detail": "此应用似乎刚从低于1.0的版本升级上来，用户登录数据和设置偏好已不可使用，现已清除。\n您可能需要再登录一次并重新设置偏好，抱歉给您带来不便。"
+    }
   }
 }

lib/i18n/strings_zh-TW.i18n.json

@@ -558,5 +558,11 @@
     "copyImageUrl": "複製圖片連結",
     "reloadImage": "重新載入圖片",
     "openLink": "開啟連結"
+  },
+    "init": {
+      "v1DeleteLegacyData": {
+        "title": "舊資料已清除",
+        "detail": "此應用程式似乎剛從低於1.0的版本升級上來，使用者登入資料和設定偏好已不可用，現已清除。\n您可能需要再登入一次並重新設定偏好，抱歉給您帶來不便。"
+      }
   }
 }