From 7dc2d291363dd0d6c3fe94462ddf777554ef9733 Mon Sep 17 00:00:00 2001
From: Abdo <abdo@abdnh.net>
Date: Sat, 18 Oct 2025 02:45:27 +0300
Subject: [PATCH] Handle deeply nested OpChanges

Messages such as AddNotesResponse were not handled correctly.
---
 proto/anki/collection.proto |  4 ++++
 pylib/anki/collection.py    |  1 +
 qt/aqt/mediasrv.py          | 25 +++++++++++++++++--------
 rslib/proto/typescript.rs   | 26 +++++++++++++++++++-------
 4 files changed, 41 insertions(+), 15 deletions(-)

diff --git a/proto/anki/collection.proto b/proto/anki/collection.proto
index 330413613..0ed1a155c 100644
--- a/proto/anki/collection.proto
+++ b/proto/anki/collection.proto
@@ -78,6 +78,10 @@ message OpChangesOnly {
   collection.OpChanges changes = 1;
 }
 
+message NestedOpChanges {
+  OpChangesOnly changes = 1;
+}
+
 message OpChangesWithCount {
   OpChanges changes = 1;
   uint32 count = 2;
diff --git a/pylib/anki/collection.py b/pylib/anki/collection.py
index 60360470c..fb50f0691 100644
--- a/pylib/anki/collection.py
+++ b/pylib/anki/collection.py
@@ -35,6 +35,7 @@ Preferences = config_pb2.Preferences
 UndoStatus = collection_pb2.UndoStatus
 OpChanges = collection_pb2.OpChanges
 OpChangesOnly = collection_pb2.OpChangesOnly
+NestedOpChanges = collection_pb2.NestedOpChanges
 OpChangesWithCount = collection_pb2.OpChangesWithCount
 OpChangesWithId = collection_pb2.OpChangesWithId
 OpChangesAfterUndo = collection_pb2.OpChangesAfterUndo
diff --git a/qt/aqt/mediasrv.py b/qt/aqt/mediasrv.py
index 550a47ad3..7a028b002 100644
--- a/qt/aqt/mediasrv.py
+++ b/qt/aqt/mediasrv.py
@@ -30,7 +30,13 @@ import aqt
 import aqt.main
 import aqt.operations
 from anki import frontend_pb2, generic_pb2, hooks
-from anki.collection import OpChanges, OpChangesOnly, Progress, SearchNode
+from anki.collection import (
+    NestedOpChanges,
+    OpChanges,
+    OpChangesOnly,
+    Progress,
+    SearchNode,
+)
 from anki.decks import UpdateDeckConfigs
 from anki.scheduler.v3 import SchedulingStatesWithContext, SetSchedulingStatesRequest
 from anki.utils import dev_mode, from_json_bytes, to_json_bytes
@@ -1001,16 +1007,19 @@ def raw_backend_request(endpoint: str) -> Callable[[], bytes]:
         output = getattr(aqt.mw.col._backend, f"{endpoint}_raw")(request.data)
         op_changes_type = int(request.headers.get("Anki-Op-Changes", "0"))
         if op_changes_type:
-            response: OpChanges | OpChangesOnly
-            if op_changes_type == 1:
-                response = OpChanges()
-            else:
-                response = OpChangesOnly()
-            response.ParseFromString(output)
+            op_message_types = (OpChanges, OpChangesOnly, NestedOpChanges)
+            try:
+                response = op_message_types[op_changes_type - 1]()
+                response.ParseFromString(output)
+                changes: Any = response
+                for _ in range(op_changes_type - 1):
+                    changes = changes.changes
+            except IndexError:
+                raise ValueError(f"unhandled op changes level: {op_changes_type}")
 
             def handle_on_main() -> None:
                 handler = aqt.mw.app.activeWindow()
-                on_op_finished(aqt.mw, response, handler)
+                on_op_finished(aqt.mw, changes, handler)
 
             aqt.mw.taskman.run_on_main(handle_on_main)
 
diff --git a/rslib/proto/typescript.rs b/rslib/proto/typescript.rs
index 6572eb949..e5802fdab 100644
--- a/rslib/proto/typescript.rs
+++ b/rslib/proto/typescript.rs
@@ -101,6 +101,7 @@ enum OpChangesType {
     None = 0,
     OpChanges = 1,
     OpChangesOnly = 2,
+    NestedOpChanges = 3,
 }
 
 struct MethodDetails {
@@ -117,7 +118,8 @@ impl MethodDetails {
         let input_type = full_name_to_imported_reference(method.proto.input().full_name());
         let output_type = full_name_to_imported_reference(method.proto.output().full_name());
         let comments = method.comments.clone();
-        let op_changes_type = get_op_changes_type(&method.proto.output(), true);
+        let op_changes_type =
+            get_op_changes_type(&method.proto.output(), &method.proto.output(), 1);
         Self {
             method_name: name,
             input_type,
@@ -128,16 +130,26 @@ impl MethodDetails {
     }
 }
 
-fn get_op_changes_type(message: &MessageDescriptor, root: bool) -> OpChangesType {
+fn get_op_changes_type(
+    root_message: &MessageDescriptor,
+    message: &MessageDescriptor,
+    level: u8,
+) -> OpChangesType {
     if message.full_name() == "anki.collection.OpChanges" {
-        if root {
-            OpChangesType::OpChanges
-        } else {
-            OpChangesType::OpChangesOnly
+        match level {
+            0 => OpChangesType::None,
+            1 => OpChangesType::OpChanges,
+            2 => OpChangesType::OpChangesOnly,
+            3 => OpChangesType::NestedOpChanges,
+            _ => panic!(
+                "unhandled op changes level for message {}: {}",
+                root_message.full_name(),
+                level
+            ),
         }
     } else if let Some(field) = message.get_field(1) {
         if let Some(field_message) = field.kind().as_message() {
-            get_op_changes_type(field_message, false)
+            get_op_changes_type(root_message, field_message, level + 1)
         } else {
             OpChangesType::None
         }