❇️ Chat room summary api

DysonNetwork.Sphere/Chat/ChatController.cs

@@ -24,6 +24,36 @@ public partial class ChatController(AppDatabase db, ChatService cs) : Controller
         public Guid ChatRoomId { get; set; }
     }
 
+    public class ChatSummaryResponse
+    {
+        public int UnreadCount { get; set; }
+        public Message? LastMessage { get; set; }
+    }
+
+    [HttpGet("summary")]
+    [Authorize]
+    public async Task<ActionResult<Dictionary<Guid, ChatSummaryResponse>>> GetChatSummary()
+    {
+        if (HttpContext.Items["CurrentUser"] is not Account.Account currentUser) return Unauthorized();
+
+        var unreadMessages = await cs.CountUnreadMessageForUser(currentUser.Id);
+        var lastMessages = await cs.ListLastMessageForUser(currentUser.Id);
+        
+        var result = unreadMessages.Keys
+            .Union(lastMessages.Keys)
+            .ToDictionary(
+                roomId => roomId,
+                roomId => new ChatSummaryResponse
+                {
+                    UnreadCount = unreadMessages.GetValueOrDefault(roomId),
+                    LastMessage = lastMessages.GetValueOrDefault(roomId)
+                }
+            );
+            
+        return Ok(result);
+        
+    }
+        
     public class SendMessageRequest
     {
         [MaxLength(4096)] public string? Content { get; set; }

DysonNetwork.Sphere/Chat/ChatService.cs

@@ -107,7 +107,7 @@ public class ChatService(AppDatabase db, FileService fs, IServiceScopeFactory sc
         return messages.Count(m => !m.IsRead);
     }
 
-    public async Task<Dictionary<Guid, int>> CountUnreadMessagesForJoinedRoomsAsync(Guid userId)
+    public async Task<Dictionary<Guid, int>> CountUnreadMessageForUser(Guid userId)
     {
         var cutoff = SystemClock.Instance.GetCurrentInstant().Minus(Duration.FromDays(30));
         var userRooms = await db.ChatMembers
@@ -133,6 +133,29 @@ public class ChatService(AppDatabase db, FileService fs, IServiceScopeFactory sc
             );
     }
 
+    public async Task<Dictionary<Guid, Message?>> ListLastMessageForUser(Guid userId)
+    {
+        var userRooms = await db.ChatMembers
+            .Where(m => m.AccountId == userId)
+            .Select(m => m.ChatRoomId)
+            .ToListAsync();
+        
+        var messages = await db.ChatMessages
+            .IgnoreQueryFilters()
+            .Include(m => m.Sender)
+            .Include(m => m.Sender.Account)
+            .Include(m => m.Sender.Account.Profile)
+            .Where(m => userRooms.Contains(m.ChatRoomId))
+            .GroupBy(m => m.ChatRoomId)
+            .Select(g => g.OrderByDescending(m => m.CreatedAt).FirstOrDefault())
+            .ToDictionaryAsync(
+                m => m!.ChatRoomId,
+                m => m
+            );
+    
+        return messages;
+    }
+
     public async Task<RealtimeCall> CreateCallAsync(ChatRoom room, ChatMember sender)
     {
         var call = new RealtimeCall