ui: option to remove messages of removed members (#5717)

* ui: removing messages of removed members

* android

* fix android

* fix ios and refactor

* refactor android

* update

* update2

* remove ts

* android new logic

* refactor

* remove spaghetti

* if

* android

---------

Co-authored-by: Evgeny Poberezkin <evgeny@poberezkin.com>

apps/ios/Shared/Model/ChatModel.swift

@@ -624,6 +624,45 @@ final class ChatModel: ObservableObject {
         VoiceItemState.stopVoiceInChatView(cInfo, cItem)
     }
 
+    func removeMemberItems(_ removedMember: GroupMember, byMember: GroupMember, _ groupInfo: GroupInfo) {
+        // this should not happen, only another member can "remove" user, user can only "leave" (another event).
+        if byMember.groupMemberId == groupInfo.membership.groupMemberId {
+            logger.debug("exiting removeMemberItems")
+            return
+        }
+        if chatId == groupInfo.id {
+            for i in 0..<im.reversedChatItems.count {
+                if let updatedItem = removedUpdatedItem(im.reversedChatItems[i]) {
+                    _updateChatItem(at: i, with: updatedItem)
+                }
+            }
+        } else if let chat = getChat(groupInfo.id),
+                  chat.chatItems.count > 0,
+                  let updatedItem = removedUpdatedItem(chat.chatItems[0]) {
+                chat.chatItems = [updatedItem]
+        }
+        
+        func removedUpdatedItem(_ item: ChatItem) -> ChatItem? {
+            let newContent: CIContent
+            if case .groupSnd = item.chatDir, removedMember.groupMemberId == groupInfo.membership.groupMemberId {
+                newContent = .sndModerated
+            } else if case let .groupRcv(groupMember) = item.chatDir, groupMember.groupMemberId == removedMember.groupMemberId {
+                newContent = .rcvModerated
+            } else {
+                return nil
+            }
+            var updatedItem = item
+            updatedItem.meta.itemDeleted = .moderated(deletedTs: Date.now, byGroupMember: byMember)
+            if groupInfo.fullGroupPreferences.fullDelete.on {
+                updatedItem.content = newContent
+            }
+            if item.isActiveReport {
+                decreaseGroupReportsCounter(groupInfo.id)
+            }
+            return updatedItem
+        }
+    }
+
     func nextChatItemData<T>(_ chatItemId: Int64, previous: Bool, map: @escaping (ChatItem) -> T?) -> T? {
         guard var i = im.reversedChatItems.firstIndex(where: { $0.id == chatItemId }) else { return nil }
         if previous {

apps/ios/Shared/Model/SimpleXAPI.swift

@@ -1588,9 +1588,9 @@ func apiJoinGroup(_ groupId: Int64) async throws -> JoinGroupResult {
     }
 }
 
-func apiRemoveMembers(_ groupId: Int64, _ memberIds: [Int64]) async throws -> [GroupMember] {
-    let r = await chatSendCmd(.apiRemoveMembers(groupId: groupId, memberIds: memberIds), bgTask: false)
-    if case let .userDeletedMembers(_, _, members) = r { return members }
+func apiRemoveMembers(_ groupId: Int64, _ memberIds: [Int64], _ withMessages: Bool = false) async throws -> [GroupMember] {
+    let r = await chatSendCmd(.apiRemoveMembers(groupId: groupId, memberIds: memberIds, withMessages: withMessages), bgTask: false)
+    if case let .userDeletedMembers(_, _, members, withMessages) = r { return members }
     throw r
 }
 
@@ -2187,16 +2187,22 @@ func processReceivedMsg(_ res: ChatResponse) async {
                 _ = m.upsertGroupMember(groupInfo, member)
             }
         }
-    case let .deletedMemberUser(user, groupInfo, _): // TODO update user member
+    case let .deletedMemberUser(user, groupInfo, member, withMessages): // TODO update user member
         if active(user) {
             await MainActor.run {
                 m.updateGroup(groupInfo)
+                if withMessages {
+                    m.removeMemberItems(groupInfo.membership, byMember: member, groupInfo)
+                }
             }
         }
-    case let .deletedMember(user, groupInfo, _, deletedMember):
+    case let .deletedMember(user, groupInfo, byMember, deletedMember, withMessages):
         if active(user) {
             await MainActor.run {
                 _ = m.upsertGroupMember(groupInfo, deletedMember)
+                if withMessages {
+                    m.removeMemberItems(deletedMember, byMember: byMember, groupInfo)
+                }
             }
         }
     case let .leftMember(user, groupInfo, member):