From 7562a7fc612f807fd79fbb4ab306caff50807f03 Mon Sep 17 00:00:00 2001
From: Pierre HUBERT <pierre.git@communiquons.org>
Date: Mon, 24 Nov 2025 11:20:20 +0100
Subject: [PATCH] Get latest message for a room

---
 .../matrix/matrix_event_controller.rs         | 60 +++++++++++++++++++
 .../matrix/matrix_room_controller.rs          |  6 ++
 .../src/controllers/matrix/mod.rs             |  1 +
 3 files changed, 67 insertions(+)
 create mode 100644 matrixgw_backend/src/controllers/matrix/matrix_event_controller.rs

diff --git a/matrixgw_backend/src/controllers/matrix/matrix_event_controller.rs b/matrixgw_backend/src/controllers/matrix/matrix_event_controller.rs
new file mode 100644
index 0000000..a8228de
--- /dev/null
+++ b/matrixgw_backend/src/controllers/matrix/matrix_event_controller.rs
@@ -0,0 +1,60 @@
+use futures_util::{StreamExt, stream};
+use matrix_sdk::Room;
+use matrix_sdk::deserialized_responses::{TimelineEvent, TimelineEventKind};
+use matrix_sdk::room::MessagesOptions;
+use matrix_sdk::ruma::{MilliSecondsSinceUnixEpoch, OwnedEventId, OwnedUserId, RoomId, UInt};
+use serde::Serialize;
+use serde_json::value::RawValue;
+
+#[derive(Serialize)]
+pub struct APIEvent {
+    id: OwnedEventId,
+    time: MilliSecondsSinceUnixEpoch,
+    sender: OwnedUserId,
+    data: Box<RawValue>,
+}
+
+impl APIEvent {
+    pub async fn from_evt(msg: TimelineEvent, room_id: &RoomId) -> anyhow::Result<Self> {
+        let (event, raw) = match &msg.kind {
+            TimelineEventKind::Decrypted(d) => (d.event.deserialize()?, d.event.json()),
+            TimelineEventKind::UnableToDecrypt { event, .. }
+            | TimelineEventKind::PlainText { event } => (
+                event.deserialize()?.into_full_event(room_id.to_owned()),
+                event.json(),
+            ),
+        };
+
+        Ok(Self {
+            id: event.event_id().to_owned(),
+            time: event.origin_server_ts(),
+            sender: event.sender().to_owned(),
+            data: raw.to_owned(),
+        })
+    }
+}
+
+#[derive(Serialize)]
+pub struct APIEventsList {
+    pub start: String,
+    pub end: Option<String>,
+    pub messages: Vec<APIEvent>,
+}
+
+/// Get messages for a given room
+pub(super) async fn get_events(room: &Room, limit: u32) -> anyhow::Result<APIEventsList> {
+    let mut msg_opts = MessagesOptions::backward();
+    msg_opts.limit = UInt::from(limit);
+
+    let messages = room.messages(msg_opts).await?;
+    Ok(APIEventsList {
+        start: messages.start,
+        end: messages.end,
+        messages: stream::iter(messages.chunk)
+            .then(async |msg| APIEvent::from_evt(msg, room.room_id()).await)
+            .collect::<Vec<_>>()
+            .await
+            .into_iter()
+            .collect::<Result<Vec<_>, _>>()?,
+    })
+}
diff --git a/matrixgw_backend/src/controllers/matrix/matrix_room_controller.rs b/matrixgw_backend/src/controllers/matrix/matrix_room_controller.rs
index 4344877..3970c7d 100644
--- a/matrixgw_backend/src/controllers/matrix/matrix_room_controller.rs
+++ b/matrixgw_backend/src/controllers/matrix/matrix_room_controller.rs
@@ -1,4 +1,5 @@
 use crate::controllers::HttpResult;
+use crate::controllers::matrix::matrix_event_controller::{APIEvent, get_events};
 use crate::controllers::matrix::matrix_media_controller;
 use crate::extractors::matrix_client_extractor::MatrixClientExtractor;
 use actix_web::{HttpRequest, HttpResponse, web};
@@ -15,10 +16,13 @@ pub struct APIRoomInfo {
     avatar: Option<OwnedMxcUri>,
     is_space: bool,
     parents: Vec<OwnedRoomId>,
+    number_unread_messages: u64,
+    latest_event: Option<APIEvent>,
 }
 
 impl APIRoomInfo {
     async fn from_room(r: &Room) -> anyhow::Result<Self> {
+        // Get parent spaces
         let parent_spaces = r
             .parent_spaces()
             .await?
@@ -47,6 +51,8 @@ impl APIRoomInfo {
             avatar: r.avatar_url(),
             is_space: r.is_space(),
             parents: parent_spaces,
+            number_unread_messages: r.num_unread_messages(),
+            latest_event: get_events(r, 1).await?.messages.into_iter().next(),
         })
     }
 }
diff --git a/matrixgw_backend/src/controllers/matrix/mod.rs b/matrixgw_backend/src/controllers/matrix/mod.rs
index 2d86649..3a34b16 100644
--- a/matrixgw_backend/src/controllers/matrix/mod.rs
+++ b/matrixgw_backend/src/controllers/matrix/mod.rs
@@ -1,3 +1,4 @@
+pub mod matrix_event_controller;
 pub mod matrix_media_controller;
 pub mod matrix_profile_controller;
 pub mod matrix_room_controller;