feat: Archive with clean up

lib/views/archive.dart

@@ -1,7 +1,10 @@
+import 'package:adaptive_dialog/adaptive_dialog.dart';
 import 'package:famedlysdk/famedlysdk.dart';
 import 'package:fluffychat/views/ui/archive_ui.dart';
 import 'package:fluffychat/views/widgets/matrix.dart';
 import 'package:flutter/material.dart';
+import 'package:future_loading_dialog/future_loading_dialog.dart';
+import 'package:flutter_gen/gen_l10n/l10n.dart';
 
 class Archive extends StatefulWidget {
   @override
@@ -18,6 +21,31 @@ class ArchiveController extends State<Archive> {
 
   void forgetAction(int i) => setState(() => archive.removeAt(i));
 
+  void forgetAllAction() async {
+    if (await showOkCancelAlertDialog(
+          context: context,
+          title: L10n.of(context).areYouSure,
+          okLabel: L10n.of(context).yes,
+          cancelLabel: L10n.of(context).cancel,
+          message: L10n.of(context).clearArchive,
+          useRootNavigator: false,
+        ) !=
+        OkCancelResult.ok) {
+      return;
+    }
+    await showFutureLoadingDialog(
+      context: context,
+      future: () async {
+        while (archive.isNotEmpty) {
+          Logs().v('Forget room ${archive.last.displayname}');
+          await archive.last.forget();
+          archive.removeLast();
+        }
+      },
+    );
+    setState(() => null);
+  }
+
   @override
   Widget build(BuildContext context) => ArchiveUI(this);
 }