open group batch delete reactions per emoji

SessionMessagingKit/Sending & Receiving/MessageReceiver+Handling.swift

@@ -386,7 +386,14 @@ extension MessageReceiver {
             }
             let reactionMessage = ReactMessage(timestamp: timestamp, authorId: author, emoji: reaction.emoji)
             reactionMessage.sender = message.sender
-            if let serverID = message.openGroupServerMessageID { reactionMessage.messageId = "\(serverID)" }
+            if let serverID = message.openGroupServerMessageID {
+                reactionMessage.messageId = "\(serverID)"
+                // Create a lookup between the openGroupServerMessageId and the tsMessage id for easy lookup
+                // For emoji reacts, the lookup is linking emoji react message server id to the id of the tsMessage that the emoji is reacted to
+                if let openGroup: OpenGroupV2 = storage.getV2OpenGroup(for: threadID) {
+                    storage.addOpenGroupServerIdLookup(serverID, tsMessageId: tsMessage?.uniqueId, in: openGroup.room, on: openGroup.server, using: transaction)
+                }
+            }
             if let serverHash = message.serverHash { reactionMessage.messageId = serverHash }
             switch reaction.kind {
             case .react:

SessionMessagingKit/Sending & Receiving/Pollers/OpenGroupPollerV2.swift

@@ -104,8 +104,18 @@ public final class OpenGroupPollerV2 : NSObject {
                 }
                 guard let tsMessage: TSMessage = TSMessage.fetch(uniqueId: messageLookup.tsMessageId, transaction: transaction) else { return }
                 
-                tsMessage.remove(with: transaction)
-                storage.removeOpenGroupServerIdLookup(openGroupServerMessageId, in: body.room, on: self.server, using: transaction)
+                if tsMessage.openGroupServerMessageID == openGroupServerMessageId { // This is the case the deleted message is a tsMessage
+                    tsMessage.remove(with: transaction)
+                    storage.removeOpenGroupServerIdLookup(openGroupServerMessageId, in: body.room, on: self.server, using: transaction)
+                } else { // Otherwise the deleted message is an emoji react
+                    for reaction in tsMessage.reactions {
+                        if let reactMessage = reaction as? ReactMessage, let messageIdString = reactMessage.messageId, let messageId = UInt64(messageIdString), messageId == openGroupServerMessageId {
+                            tsMessage.removeReaction(reactMessage, transaction: transaction)
+                            storage.removeOpenGroupServerIdLookup(openGroupServerMessageId, in: body.room, on: self.server, using: transaction)
+                            break
+                        }
+                    }
+                }
             }
         }
     }