Matrix: show last message sorted by timestamp in room description

1 files changed, 25 insertions, 8 deletions

diff --git a/src/plugins/Matrix.cpp b/src/plugins/Matrix.cpp
index c1f2b3c..7c170c9 100644
--- a/src/plugins/Matrix.cpp
+++ b/src/plugins/Matrix.cpp
@@ -373,6 +373,12 @@ namespace QuickMedia {
         unread_notifications.clear();
     }
 
+    static std::shared_ptr<Message> get_last_message_by_timestamp(const Messages &messages) {
+        return *std::max_element(messages.begin(), messages.end(), [](const std::shared_ptr<Message> &message1, const std::shared_ptr<Message> &message2) {
+            return message1->timestamp < message2->timestamp;
+        });
+    }
+
     void MatrixQuickMedia::update_room_description(RoomData *room, bool is_initial_sync) {        
         room->acquire_room_lock();
         const Messages &messages = room->get_messages_thread_unsafe();
@@ -385,10 +391,25 @@ namespace QuickMedia {
                 read_marker_message_timestamp = read_marker_message->timestamp;
         }
 
-        // TODO: this wont always work because we dont display all types of messages from server, such as "joined", "left", "kicked", "banned", "changed avatar", "changed display name", etc.
+        std::shared_ptr<Message> last_message = get_last_message_by_timestamp(messages);
+        if(!last_message) {
+            room->release_room_lock();
+            return;
+        }
+
+        auto last_message_it = last_message_by_room.find(room);
+        if(last_message_it != last_message_by_room.end()) {
+            if(last_message->timestamp > last_message_it->second->timestamp)
+                last_message_it->second = last_message;
+            else
+                last_message = last_message_it->second;
+        } else {
+           last_message_by_room[room] = last_message;
+        }
+
         Message *last_unread_message = nullptr;
-        if(!messages.empty() && messages.back()->timestamp > read_marker_message_timestamp)
-            last_unread_message = messages.back().get();
+        if(last_message->timestamp > read_marker_message_timestamp)
+            last_unread_message = last_message.get();
 
         BodyItem *room_body_item = static_cast<BodyItem*>(room->userdata);
         assert(room_body_item);
@@ -405,11 +426,7 @@ namespace QuickMedia {
             rooms_page->move_room_to_top(room);
             room_tags_page->move_room_to_top(room);
         } else if(is_initial_sync) {
-            Message *last_message = nullptr;
-            if(!messages.empty())
-                last_message = messages.back().get();
-            if(last_message)
-                room_body_item->set_description(matrix->message_get_author_displayname(last_message) + ": " + extract_first_line_elipses(last_message->body, 150));
+            room_body_item->set_description(matrix->message_get_author_displayname(last_message.get()) + ": " + extract_first_line_elipses(last_message->body, 150));
         }
 
         room->release_room_lock();