Better admin logging for nanochat

This reverts commit 9e617db031.

Content.Client/CartridgeLoader/CartridgeLoaderBoundUserInterface.cs

@@ -59,6 +59,9 @@ public abstract class CartridgeLoaderBoundUserInterface : BoundUserInterface
             SendCartridgeUiReadyEvent(_activeProgram.Value);
         }
 
+        if (_activeCartridgeUI is IDisposable disposableUi) // Funky: Handle cleanup for popups and such.
+            disposableUi.Dispose();
+
         _activeCartridgeUI = ui;
         _activeUiFragment?.Dispose();
         _activeUiFragment = control;
@@ -121,8 +124,13 @@ public abstract class CartridgeLoaderBoundUserInterface : BoundUserInterface
     {
         base.Dispose(disposing);
 
-        if (disposing)
+        if (disposing) // Funky: Handle cleanup for popups and such.
+        {
+            if (_activeCartridgeUI is IDisposable disposableUi)
+                disposableUi.Dispose();
+
             _activeUiFragment?.Dispose();
+        }
     }
 
     protected CartridgeComponent? RetrieveCartridgeComponent(EntityUid? cartridgeUid)

Content.Client/_DV/CartridgeLoader/Cartridges/NanoChatEntry.xaml

@@ -26,6 +26,16 @@
                 </PanelContainer.PanelOverride>
             </PanelContainer>
 
+            <!-- Group chat icon -->
+            <TextureRect Name="GroupIcon"
+                         TexturePath="/Textures/_Funkystation/Interface/NanoChat/members.png"
+                         MinSize="16 16"
+                         MaxSize="16 16"
+                         Stretch="KeepAspectCentered"
+                         VerticalAlignment="Center"
+                         Margin="4 0 6 0"
+                         Visible="False" />
+
             <!-- Text container -->
             <BoxContainer Orientation="Vertical"
                           HorizontalExpand="True"

Content.Client/_DV/CartridgeLoader/Cartridges/NanoChatEntry.xaml.cs

@@ -44,6 +44,7 @@ public sealed partial class NanoChatEntry : BoxContainer
         JobLabel.Text = FormattedMessage.EscapeText(SharedNanoChatSystem.Truncate(recipient.JobTitle ?? string.Empty, _maxIdJobLength));
         JobLabel.Visible = !string.IsNullOrWhiteSpace(JobLabel.Text);
         UnreadIndicator.Visible = recipient.HasUnread;
+        GroupIcon.Visible = recipient.IsGroup;
 
         ChatButton.ModulateSelfOverride = isSelected ? NanoChatMessageBubble.OwnMessageColor : null;
     }

Content.Client/_DV/CartridgeLoader/Cartridges/NanoChatLookupView.xaml.cs

@@ -1,9 +1,12 @@
+using System.Linq;
 using System.Numerics;
 using Content.Shared._DV.CartridgeLoader.Cartridges;
+using Content.Shared.Roles;
 using Robust.Client.AutoGenerated;
-using Robust.Client.UserInterface;
 using Robust.Client.UserInterface.Controls;
 using Robust.Client.UserInterface.XAML;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Utility;
 
 namespace Content.Client._DV.CartridgeLoader.Cartridges;
 
@@ -26,12 +29,67 @@ public sealed partial class NanoChatLookupView : PanelContainer
             return;
         }
 
-        for (var idx = 0; idx < contacts.Count; idx++)
+        var prototypeManager = IoCManager.Resolve<IPrototypeManager>();
+        var departmentGroups = new Dictionary<DepartmentPrototype, List<NanoChatRecipient>>();
+        var noDepartmentContacts = new List<NanoChatRecipient>();
+
+        foreach (var contact in contacts)
         {
-            var contact = contacts[idx];
+            if (!string.IsNullOrWhiteSpace(contact.Department) &&
-            var isEvenRow = idx % 2 == 0;
+                prototypeManager.TryIndex<DepartmentPrototype>(contact.Department, out var dept))
-            var contactControl = new ContactContainer(contact, state, isEvenRow, OnStartChat);
+            {
-            ContactsList.AddChild(contactControl);
+                departmentGroups.GetOrNew(dept).Add(contact);
+            }
+            else
+            {
+                noDepartmentContacts.Add(contact);
+            }
+        }
+
+        var rowIndex = 0;
+        foreach (var (department, departmentContacts) in departmentGroups.OrderBy(entry => entry.Key, DepartmentUIComparer.Instance))
+        {
+            departmentContacts.Sort();
+
+            // Add department header
+            ContactsList.AddChild(new Label
+            {
+                Text = Loc.GetString(department.Name),
+                StyleClasses = { "LabelBig" },
+                Margin = new Thickness(0, rowIndex == 0 ? 0 : 8, 0, 2)
+            });
+
+            foreach (var contact in departmentContacts)
+            {
+                var isEvenRow = rowIndex % 2 == 0;
+                var contactControl = new ContactContainer(contact, state, isEvenRow, OnStartChat);
+                ContactsList.AddChild(contactControl);
+                rowIndex++;
+            }
+        }
+
+        // Add contacts without departments at the end
+        if (noDepartmentContacts.Count > 0)
+        {
+            noDepartmentContacts.Sort();
+
+            if (departmentGroups.Count > 0)
+            {
+                ContactsList.AddChild(new Label
+                {
+                    Text = Loc.GetString("nano-chat-other-department"),
+                    StyleClasses = { "LabelBig" },
+                    Margin = new Thickness(0, 8, 0, 2)
+                });
+            }
+
+            foreach (var contact in noDepartmentContacts)
+            {
+                var isEvenRow = rowIndex % 2 == 0;
+                var contactControl = new ContactContainer(contact, state, isEvenRow, OnStartChat);
+                ContactsList.AddChild(contactControl);
+                rowIndex++;
+            }
         }
     }
 
@@ -42,9 +100,13 @@ public sealed partial class NanoChatLookupView : PanelContainer
             HorizontalExpand = true;
             StyleClasses.Add(isEvenRow ? "PanelBackgroundBaseDark" : "PanelBackgroundLight");
 
+            var displayName = contact.Name;
+            if (!string.IsNullOrWhiteSpace(contact.JobTitle))
+                displayName = $"{contact.Name} ({contact.JobTitle})";
+
             var nameLabel = new Label()
             {
-                Text = contact.Name,
+                Text = displayName,
                 HorizontalAlignment = HAlignment.Left,
                 HorizontalExpand = true
             };

Content.Client/_DV/CartridgeLoader/Cartridges/NanoChatMessageBubble.xaml

@@ -1,5 +1,6 @@
 <cartridges:NanoChatMessageBubble
     xmlns="https://spacestation14.io"
+    xmlns:nanochatui="clr-namespace:Content.Client._DV.NanoChat.UI"
     xmlns:cartridges="clr-namespace:Content.Client._DV.CartridgeLoader.Cartridges"
     xmlns:graphics="clr-namespace:Robust.Client.Graphics;assembly=Robust.Client"
     HorizontalExpand="True">
@@ -7,31 +8,34 @@
     <BoxContainer Name="MessageContainer"
                   Orientation="Horizontal"
                   HorizontalExpand="True">
-        <!-- Left spacer for other's messages -->
+        <!--  Left spacer for other's messages  -->
-        <Control Name="LeftSpacer"
+        <Control MinSize="12 0" Name="LeftSpacer" />
-                 MinSize="12 0" />
 
         <!-- Message panel -->
         <BoxContainer Name="MessageBox"
                       Orientation="Vertical"
                       MaxWidth="320"
                       HorizontalExpand="True">
+
+            <!-- Sender name -->
+            <Label HorizontalAlignment="Left"
+                   Margin="10,0,10,2"
+                   Name="SenderNameLabel"
+                   StyleClasses="LabelSmall"
+                   Visible="False" />
+
             <PanelContainer Name="MessagePanel"
                             MaxWidth="320"
                             HorizontalExpand="True">
                 <PanelContainer.PanelOverride>
-                    <graphics:StyleBoxFlat
+                    <graphics:StyleBoxFlat BorderThickness="1">
-                        ContentMarginLeftOverride="10"
-                        ContentMarginRightOverride="10"
-                        ContentMarginTopOverride="6"
-                        ContentMarginBottomOverride="6"
-                        BorderThickness="1">
                         <!-- Colors set in code based on message sender -->
                     </graphics:StyleBoxFlat>
                 </PanelContainer.PanelOverride>
 
                 <RichTextLabel Name="MessageText"
-                               HorizontalExpand="True" />
+                               HorizontalExpand="True"
+                               Margin="10,6,10,6" />
             </PanelContainer>
 
             <!-- Delivery failed text -->

Content.Client/_DV/CartridgeLoader/Cartridges/NanoChatMessageBubble.xaml.cs

@@ -1,15 +1,19 @@
+using System.Text.RegularExpressions;
 using Content.Shared._DV.CartridgeLoader.Cartridges;
 using Robust.Client.AutoGenerated;
 using Robust.Client.Graphics;
 using Robust.Client.UserInterface.Controls;
 using Robust.Client.UserInterface.XAML;
 using Robust.Shared.Utility;
+using Content.Client._Funkystation.NanoChat;
 
 namespace Content.Client._DV.CartridgeLoader.Cartridges;
 
 [GenerateTypedNameReferences]
 public sealed partial class NanoChatMessageBubble : BoxContainer
 {
+    private static readonly Regex EmojiRegex = new(@":(\w+):", RegexOptions.Compiled);
+
     public static readonly Color OwnMessageColor = Color.FromHex("#173717d9"); // Dark green
     public static readonly Color OtherMessageColor = Color.FromHex("#252525d9"); // Dark gray
     public static readonly Color BorderColor = Color.FromHex("#40404066"); // Subtle border
@@ -21,7 +25,7 @@ public sealed partial class NanoChatMessageBubble : BoxContainer
         RobustXamlLoader.Load(this);
     }
 
-    public void SetMessage(NanoChatMessage message, bool isOwnMessage)
+    public void SetMessage(NanoChatMessage message, bool isOwnMessage, string? senderName = null, bool showSenderName = false)
     {
         if (MessagePanel.PanelOverride is not StyleBoxFlat)
             return;
@@ -31,8 +35,20 @@ public sealed partial class NanoChatMessageBubble : BoxContainer
         style.BackgroundColor = isOwnMessage ? OwnMessageColor : OtherMessageColor;
         style.BorderColor = BorderColor;
 
-        // Set message content
+        var contentWithEmoji = EmojiRegex.Replace(FormattedMessage.EscapeText(message.Content), "[emoji=\"$1\"]");
-        MessageText.Text = FormattedMessage.EscapeText(message.Content);
+
+        MessageText.SetMessage(
+            FormattedMessage.FromMarkupPermissive(contentWithEmoji),
+            new[] { typeof(EmojiTag) }
+        );
+
+        SenderNameLabel.Visible = showSenderName && !string.IsNullOrEmpty(senderName);
+        if (SenderNameLabel.Visible)
+        {
+            SenderNameLabel.Text = senderName;
+            SenderNameLabel.Modulate = TextColor;
+        }
+
         MessageText.Modulate = TextColor;
 
         // Show delivery failed text if needed (only for own messages)

Content.Client/_DV/CartridgeLoader/Cartridges/NanoChatUi.cs

@@ -5,7 +5,7 @@ using Robust.Client.UserInterface;
 
 namespace Content.Client._DV.CartridgeLoader.Cartridges;
 
-public sealed partial class NanoChatUi : UIFragment
+public sealed partial class NanoChatUi : UIFragment, IDisposable
 {
     private NanoChatUiFragment? _fragment;
 
@@ -30,6 +30,12 @@ public sealed partial class NanoChatUi : UIFragment
             _fragment?.UpdateState(cast);
     }
 
+    public void Dispose()
+    {
+        // Close all popups when switching apps or closing the PDA
+        _fragment?.CloseAllPopups();
+    }
+
     private static void SendNanoChatUiMessage(NanoChatUiMessageType type,
         uint? number,
         string? content,

Content.Client/_DV/CartridgeLoader/Cartridges/NanoChatUiFragment.xaml

@@ -60,6 +60,17 @@
                         Margin="0 0 4 0"
                         StyleClasses="OpenBoth"
                         ToolTip="{Loc nano-chat-new-chat}" />
+                <Button Name="CreateGroupChatButton"
+                        MinSize="32 32"
+                        MaxSize="32 32"
+                        Margin="0 0 4 0"
+                        StyleClasses="OpenBoth"
+                        ToolTip="{Loc nano-chat-create-group}">
+                    <TextureRect StyleClasses="ButtonSquare"
+                                 TexturePath="/Textures/_Funkystation/Interface/NanoChat/members.png"
+                                 Stretch="KeepAspectCentered"
+                                 MinSize="18 18" />
+                </Button>
                 <Button Name="LookupButton"
                         MaxSize="32 32"
                         StyleClasses="OpenBoth"
@@ -84,12 +95,20 @@
             </BoxContainer>
         </controls:StripeBack>
 
+        <Label Name="NoIdLabel"
+               Text="{Loc 'nano-chat-no-id-card'}"
+               HorizontalAlignment="Center"
+               VerticalAlignment="Center"
+               VerticalExpand="True"
+               HorizontalExpand="True"
+               Visible="True" />
         <!-- Main content split -->
         <BoxContainer Name="ChatView"
                       Orientation="Horizontal"
                       VerticalExpand="True"
                       HorizontalExpand="True"
-                      Margin="0 5 0 0">
+                      Margin="0 5 0 0"
+                      Visible="False">
             <!-- Left panel: Chat list -->
             <PanelContainer StyleClasses="AngleRect"
                             VerticalExpand="True"
@@ -167,6 +186,18 @@
                                         Stretch="KeepAspectCentered"
                                         MinSize="18 18" />
                         </Button>
+                        <!-- View Members should take place of edit button in group chats, to avoid layout shift when moving between normal and group -->
+                        <Button Name="ViewMembersButton"
+                                MaxSize="32 32"
+                                Visible="False"
+                                StyleClasses="OpenBoth"
+                                Margin="0 0 4 0"
+                                ToolTip="{Loc nano-chat-view-members}">
+                            <TextureRect StyleClasses="ButtonSquare"
+                                        TexturePath="/Textures/_Funkystation/Interface/NanoChat/members.png"
+                                        Stretch="KeepAspectCentered"
+                                        MinSize="18 18" />
+                        </Button>
                         <Button Name="DeleteChatButton"
                                 MaxSize="32 32"
                                 Visible="False"
@@ -197,11 +228,34 @@
                                              MinSize="18 18" />
                             </Control>
                         </Button>
+                        <Button Name="InviteToGroupButton"
+                                MaxSize="32 32"
+                                Visible="False"
+                                StyleClasses="OpenBoth"
+                                Margin="0 0 4 0"
+                                ToolTip="{Loc nano-chat-invite-to-group}">
+                            <TextureRect StyleClasses="ButtonSquare"
+                                        TexturePath="/Textures/_Funkystation/Interface/NanoChat/invite.png"
+                                        Stretch="KeepAspectCentered"
+                                        MinSize="18 18" />
+                        </Button>
                         <!-- Input row -->
                         <LineEdit Name="MessageInput"
                                   PlaceHolder="{Loc nano-chat-message-placeholder}"
                                   HorizontalExpand="True"
                                   StyleClasses="OpenRight" />
+                        <!-- Emoji Picker -->
+                        <Button Name="EmojiButton"
+                                MinSize="32 32"
+                                MaxSize="32 32"
+                                StyleClasses="OpenBoth"
+                                Margin="4 0 0 0"
+                                ToolTip="{Loc nano-chat-emoji-picker}">
+                            <TextureRect StyleClasses="ButtonSquare"
+                                         TexturePath="/Textures/Interface/Emotes/laugh.png"
+                                         Stretch="KeepAspectCentered"
+                                         MinSize="24 24" />
+                        </Button>
                         <Button Name="SendButton"
                                 MinSize="32 32"
                                 Disabled="True"

Content.Client/_DV/CartridgeLoader/Cartridges/NanoChatUiFragment.xaml.cs

@@ -1,7 +1,18 @@
+// SPDX-FileCopyrightText: 2024 Skubman <ba.fallaria@gmail.com>
+// SPDX-FileCopyrightText: 2024 Tadeo <td12233a@gmail.com>
+// SPDX-FileCopyrightText: 2025 Evaisa <evagiacosa1@gmail.com>
+// SPDX-FileCopyrightText: 2025 EvaisaDev <mail@evaisa.dev>
+// SPDX-FileCopyrightText: 2025 Icepick <122653407+Icepicked@users.noreply.github.com>
+// SPDX-FileCopyrightText: 2025 corresp0nd <46357632+corresp0nd@users.noreply.github.com>
+// SPDX-FileCopyrightText: 2025 taydeo <td12233a@gmail.com>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later AND MIT
+
 using System.Linq;
 using System.Numerics;
 using Content.Shared._DV.CartridgeLoader.Cartridges;
 using Content.Shared.CCVar;
+using Content.Client._Funkystation.NanoChat;
 using Robust.Client.AutoGenerated;
 using Robust.Client.UserInterface.Controls;
 using Robust.Client.UserInterface.XAML;
@@ -18,10 +29,14 @@ public sealed partial class NanoChatUiFragment : BoxContainer
     [Dependency] private readonly IGameTiming _timing = default!;
     [Dependency] private readonly IConfigurationManager _cfg = default!;
 
-    private int _maxNameLength;
+    private readonly int _maxNameLength;
-    private int _maxIdJobLength;
+    private readonly int _maxIdJobLength;
     private readonly NewChatPopup _newChatPopup;
     private readonly EditChatPopup _editChatPopup;
+    private readonly CreateGroupChatPopup _createGroupChatPopup;
+    private readonly InviteToGroupPopup _inviteToGroupPopup;
+    private readonly GroupMembersPopup _groupMembersPopup;
+    private readonly EmojiPickerPopup _emojiPickerPopup;
     private uint? _currentChat;
     private uint? _pendingChat;
     private uint _ownNumber;
@@ -30,6 +45,7 @@ public sealed partial class NanoChatUiFragment : BoxContainer
     private Dictionary<uint, NanoChatRecipient> _recipients = [];
     private Dictionary<uint, List<NanoChatMessage>> _messages = [];
     private HashSet<uint> _mutedChats = [];
+    private List<NanoChatRecipient>? _contacts; // Used in order to show names for people not in recipients
 
     public event Action<NanoChatUiMessageType, uint?, string?, string?>? OnMessageSent;
 
@@ -43,6 +59,10 @@ public sealed partial class NanoChatUiFragment : BoxContainer
 
         _newChatPopup = new(_maxNameLength, _maxIdJobLength);
         _editChatPopup = new(_maxNameLength, _maxIdJobLength);
+        _createGroupChatPopup = new(_maxNameLength);
+        _inviteToGroupPopup = new();
+        _groupMembersPopup = new();
+        _emojiPickerPopup = new();
         SetupEventHandlers();
     }
 
@@ -58,12 +78,57 @@ public sealed partial class NanoChatUiFragment : BoxContainer
             OnMessageSent?.Invoke(NanoChatUiMessageType.EditChat, number, name, job);
         };
 
+        _createGroupChatPopup.OnGroupCreated += (name) =>
+        {
+            OnMessageSent?.Invoke(NanoChatUiMessageType.CreateGroupChat, null, name, null);
+        };
+
+        _inviteToGroupPopup.OnInvite += (number) =>
+        {
+            if (_currentChat is not uint currentChat)
+                return;
+
+            OnMessageSent?.Invoke(NanoChatUiMessageType.InviteToGroup, currentChat, number.ToString(), null);
+        };
+
+        _groupMembersPopup.OnKick += (number) =>
+        {
+            if (_currentChat is not uint currentChat)
+                return;
+
+            OnMessageSent?.Invoke(NanoChatUiMessageType.KickFromGroup, currentChat, number.ToString(), null);
+        };
+
+        _groupMembersPopup.OnAdmin += (number) =>
+        {
+            if (_currentChat is not uint currentChat)
+                return;
+
+            OnMessageSent?.Invoke(NanoChatUiMessageType.AdminUser, currentChat, number.ToString(), null);
+        };
+
+        _groupMembersPopup.OnDeadmin += (number) =>
+        {
+            if (_currentChat is not uint currentChat)
+                return;
+
+            OnMessageSent?.Invoke(NanoChatUiMessageType.DeadminUser, currentChat, number.ToString(), null);
+        };
+
+        _emojiPickerPopup.OnEmojiSelected += InsertEmoji;
+
         NewChatButton.OnPressed += _ =>
         {
             _newChatPopup.ClearInputs();
             _newChatPopup.OpenCentered();
         };
 
+        CreateGroupChatButton.OnPressed += _ =>
+        {
+            _createGroupChatPopup.ClearInputs();
+            _createGroupChatPopup.OpenCentered();
+        };
+
         MuteChatButton.OnPressed += _ =>
         {
             if (_currentChat is not uint currentChat)
@@ -134,8 +199,39 @@ public sealed partial class NanoChatUiFragment : BoxContainer
 
         MessageInput.OnTextEntered += _ => SendMessage();
         SendButton.OnPressed += _ => SendMessage();
+        EmojiButton.OnPressed += _ => OpenEmojiPicker();
         EditChatButton.OnPressed += _ => BeginEditChat();
         DeleteChatButton.OnPressed += _ => DeleteCurrentChat();
+        InviteToGroupButton.OnPressed += _ => OpenInvitePopup();
+        ViewMembersButton.OnPressed += _ => OpenMembersPopup();
+    }
+
+    private void OpenEmojiPicker()
+    {
+        // Close any existing emoji picker to prevent duplicates (shouldn't be happening anyway but it sure did)
+        if (_emojiPickerPopup.IsOpen)
+            _emojiPickerPopup.Close();
+
+        _emojiPickerPopup.OpenCentered();
+    }
+
+    private void InsertEmoji(string emoji)
+    {
+        MessageInput.InsertAtCursor(emoji);
+        MessageInput.GrabKeyboardFocus();
+    }
+
+    /// <summary>
+    /// Closes all open popups. Called when switching apps or closing the PDA.
+    /// </summary>
+    public void CloseAllPopups()
+    {
+        _emojiPickerPopup.Close();
+        _inviteToGroupPopup.Close();
+        _groupMembersPopup.Close();
+        _newChatPopup.Close();
+        _editChatPopup.Close();
+        _createGroupChatPopup.Close();
     }
 
     private void ToggleView()
@@ -156,7 +252,7 @@ public sealed partial class NanoChatUiFragment : BoxContainer
         if (_recipients.Count == 0)
             return;
 
-        var orderedRecipients = _recipients.OrderBy(r => r.Value.Name).Select(r => r.Key).ToArray();
+        var orderedRecipients = _recipients.OrderBy(r => r.Value).Select(r => r.Key).ToArray();
         var currentChatIndex = (direction, _currentChat) switch
         {
             (CycleDirection.Up, null) => _recipients.Count,
@@ -252,6 +348,89 @@ public sealed partial class NanoChatUiFragment : BoxContainer
         OnMessageSent?.Invoke(NanoChatUiMessageType.DeleteChat, activeChat, null, null);
     }
 
+    private void OpenInvitePopup()
+    {
+        if (_currentChat is not uint currentChat ||
+            !_recipients.TryGetValue(currentChat, out var recipient) ||
+            !recipient.IsGroup)
+            return;
+
+        var availableContacts = _contacts ?? new List<NanoChatRecipient>();
+        var members = recipient.Members ?? new HashSet<uint>();
+        _inviteToGroupPopup.SetContacts(availableContacts, members, _ownNumber);
+        _inviteToGroupPopup.ClearSearch();
+        _inviteToGroupPopup.OpenCentered();
+    }
+
+    private void OpenMembersPopup()
+    {
+        if (_currentChat is not uint currentChat ||
+            !_recipients.TryGetValue(currentChat, out var recipient) ||
+            !recipient.IsGroup)
+            return;
+
+        var availableContacts = _contacts ?? new List<NanoChatRecipient>();
+        var members = recipient.Members ?? new HashSet<uint>();
+        var admins = recipient.Admins ?? new HashSet<uint>();
+        _groupMembersPopup.SetMembers(availableContacts, members, _ownNumber, recipient.CreatorId, admins);
+        _groupMembersPopup.OpenCentered();
+    }
+
+    private void RefreshOpenPopups()
+    {
+        // If popup is open, refresh it or close if no longer a member
+        if (_inviteToGroupPopup.IsOpen)
+        {
+            if (_currentChat is uint currentChat &&
+                _recipients.TryGetValue(currentChat, out var recipient) &&
+                recipient.IsGroup)
+            {
+                var members = recipient.Members ?? new HashSet<uint>();
+                if (!members.Contains(_ownNumber))
+                {
+                    _inviteToGroupPopup.Close();
+                }
+                else
+                {
+                    // Use the contacts list from the server (same as Look Up Numbers)
+                    // Don't fall back to recipients as they contain outdated cached information
+                    var availableContacts = _contacts ?? new List<NanoChatRecipient>();
+                    _inviteToGroupPopup.SetContacts(availableContacts, members, _ownNumber);
+                }
+            }
+            else
+            {
+                _inviteToGroupPopup.Close();
+            }
+        }
+
+        if (_groupMembersPopup.IsOpen)
+        {
+            if (_currentChat is uint currentChat &&
+                _recipients.TryGetValue(currentChat, out var recipient) &&
+                recipient.IsGroup)
+            {
+                var members = recipient.Members ?? new HashSet<uint>();
+                if (!members.Contains(_ownNumber))
+                {
+                    _groupMembersPopup.Close();
+                }
+                else
+                {
+                    // Use the contacts list from the server (same as Look Up Numbers)
+                    // Don't fall back to recipients as they contain outdated cached information
+                    var availableContacts = _contacts ?? new List<NanoChatRecipient>();
+                    var admins = recipient.Admins ?? new HashSet<uint>();
+                    _groupMembersPopup.SetMembers(availableContacts, members, _ownNumber, recipient.CreatorId, admins);
+                }
+            }
+            else
+            {
+                _groupMembersPopup.Close();
+            }
+        }
+    }
+
     private void BeginEditChat()
     {
         if (_currentChat is not uint currentChat)
@@ -294,17 +473,40 @@ public sealed partial class NanoChatUiFragment : BoxContainer
         var activeChat = _pendingChat ?? _currentChat;
         var hasActiveChat = activeChat != null;
 
+        var isGroupChat = false;
+        var canManageGroup = false;
+        NanoChatRecipient recipient = default;
+        var hasRecipient = false;
+
+        if (hasActiveChat && activeChat != null && _recipients.TryGetValue(activeChat.Value, out recipient))
+        {
+            hasRecipient = true;
+            isGroupChat = recipient.IsGroup;
+            canManageGroup = isGroupChat && (recipient.CreatorId == _ownNumber || recipient.Admins?.Contains(_ownNumber) == true);
+        }
+
         // Update UI state
         MessagesScroll.Visible = hasActiveChat;
         CurrentChatName.Visible = !hasActiveChat;
         MessageInputContainer.Visible = hasActiveChat;
         DeleteChatButton.Visible = hasActiveChat;
-        EditChatButton.Visible = hasActiveChat;
+        EditChatButton.Visible = hasActiveChat && !isGroupChat;
         DeleteChatButton.Disabled = !hasActiveChat;
 
-        if (activeChat != null && _recipients.TryGetValue(activeChat.Value, out var recipient))
+
+        InviteToGroupButton.Visible = canManageGroup;
+        ViewMembersButton.Visible = isGroupChat;
+
+        if (hasRecipient)
         {
-            CurrentChatName.Text = recipient.Name + (string.IsNullOrEmpty(recipient.JobTitle) ? "" : $" ({recipient.JobTitle})");
+            if (isGroupChat)
+            {
+                CurrentChatName.Text = recipient.Name;
+            }
+            else
+            {
+                CurrentChatName.Text = recipient.Name + (string.IsNullOrEmpty(recipient.JobTitle) ? "" : $" ({recipient.JobTitle})");
+            }
         }
         else
         {
@@ -321,14 +523,44 @@ public sealed partial class NanoChatUiFragment : BoxContainer
         if (activeChat == null || !messages.TryGetValue(activeChat.Value, out var chatMessages))
             return;
 
+        var isGroupChat = _recipients.TryGetValue(activeChat.Value, out var recipient) && recipient.IsGroup;
         foreach (var message in chatMessages)
         {
             var messageBubble = new NanoChatMessageBubble();
-            messageBubble.SetMessage(message, message.SenderId == _ownNumber);
+            var isOwnMessage = message.SenderId == _ownNumber;
-            MessageList.AddChild(messageBubble);
+
+            // For group chats, show sender name for other people's messages
+            string? senderName = null;
+            if (isGroupChat && !isOwnMessage)
+            {
+                // Try to get sender name from contacts first, then recipients
+                if (_recipients.TryGetValue(message.SenderId, out var senderRecipient))
+                {
+                    senderName = senderRecipient.Name;
+                }
+
+                // If not in recipients, try contacts list (station-wide directory)
+                if (senderName == null && _contacts != null)
+                {
+                    var contact = _contacts.FirstOrDefault(c => c.Number == message.SenderId);
+                    if (contact.Number != 0)
+                        senderName = contact.Name;
+                }
+
+                // Fallback to "Unknown" with number if name not found
+                if (senderName == null)
+                {
+                    senderName = $"{Loc.GetString("nano-chat-unknown-sender")}#{message.SenderId:D4}";
+                }
+            }
+
+            messageBubble.SetMessage(message, isOwnMessage, senderName, isGroupChat && !isOwnMessage);
 
             // Add spacing between messages
-            MessageList.AddChild(new Control { MinSize = new Vector2(0, 4) });
+            if (MessageList.ChildCount > 0)
+                MessageList.AddChild(new Control { Name = "MessagePadding", MinSize = new Vector2(0, 4) });
+
+            MessageList.AddChild(messageBubble);
         }
 
         MessageList.InvalidateMeasure();
@@ -357,13 +589,41 @@ public sealed partial class NanoChatUiFragment : BoxContainer
             ListNumberButton.Pressed = _listNumber;
     }
 
+    private void CheckValidNumber()
+    {
+        if (_ownNumber == 0)
+        {
+            NoIdLabel.Visible = true;
+            ChatView.Visible = false;
+            LookupView.Visible = false;
+
+            MuteButton.Disabled = true;
+            NewChatButton.Disabled = true;
+            CreateGroupChatButton.Disabled = true;
+            LookupButton.Disabled = true;
+            ListNumberButton.Disabled = true;
+        }
+        else if (NoIdLabel.Visible)
+        {
+            NoIdLabel.Visible = false;
+            ToggleView();
+
+            MuteButton.Disabled = false;
+            NewChatButton.Disabled = false;
+            CreateGroupChatButton.Disabled = false;
+            LookupButton.Disabled = false;
+            ListNumberButton.Disabled = false;
+        }
+    }
+
     public void UpdateState(NanoChatUiState state)
     {
         _ownNumber = state.OwnNumber;
         _notificationsMuted = state.NotificationsMuted;
         _listNumber = state.ListNumber;
         _mutedChats = state.MutedChats;
-        OwnNumberLabel.Text = $"#{state.OwnNumber:D4}";
+        _contacts = state.Contacts;
+        OwnNumberLabel.Text = $"#{_ownNumber:D4}";
         UpdateMuteButton();
         UpdateListNumber();
 
@@ -387,10 +647,15 @@ public sealed partial class NanoChatUiFragment : BoxContainer
         if (_pendingChat == null)
             _currentChat = state.CurrentChat;
 
-        UpdateCurrentChat();
+        // Update recipients first, then update UI that depends on it
-        UpdateMuteChatButton();
         UpdateChatList(state.Recipients);
         UpdateMessages(state.Messages);
+        UpdateCurrentChat();
+        UpdateMuteChatButton();
         LookupView.UpdateContactList(state);
+
+        CheckValidNumber();
+
+        RefreshOpenPopups();
     }
 }

Content.Client/_DV/NanoChat/EmojiControl.cs

@@ -0,0 +1,130 @@
+using System.Numerics;
+using Robust.Client.Graphics;
+using Robust.Client.ResourceManagement;
+using Robust.Client.UserInterface;
+
+namespace Content.Client._DV.NanoChat.UI;
+
+/// <summary>
+/// Extremely specialized version of <see cref="Robust.Client.UserInterface.Controls.TextureRect" /> designed for drawing Textures at fixed size with an additional offset
+/// Circumvents the problem of not having "negative mergins" on TextureRect for manual alignment
+/// This is fucking evil, please do not use this :3
+/// </summary>
+public sealed class EmojiControl : Control
+{
+    public const string StylePropertyTexture = "texture";
+    public const string StylePropertyOffset = "offset";
+
+    private Texture? _texture;
+    private Vector2? _offset;
+
+    private string? _texturePath;
+
+    public string TexturePath
+    {
+        set
+        {
+            Texture = IoCManager.Resolve<IResourceCache>().GetResource<TextureResource>(value);
+            _texturePath = value;
+        }
+
+    }
+
+    protected override void OnThemeUpdated()
+    {
+        if (_texturePath != null) Texture = Theme.ResolveTexture(_texturePath);
+        base.OnThemeUpdated();
+    }
+
+    /// <summary>
+    ///     The texture to draw.
+    /// </summary>
+    public Texture? Texture
+    {
+        get
+        {
+            if (_texture is null)
+            {
+                if (TryGetStyleProperty(StylePropertyTexture, out Texture? texture))
+                {
+                    return texture;
+                }
+            }
+
+            return _texture;
+        }
+        set
+        {
+            var oldSize = _texture?.Size;
+            _texture = value;
+
+            if (value?.Size != oldSize)
+            {
+                InvalidateMeasure();
+            }
+        }
+    }
+
+    /// <summary>
+    ///     Vertical offset of the texture
+    /// </summary>
+    public Vector2 Offset
+    {
+        get
+        {
+            if (_offset is null)
+            {
+                if (TryGetStyleProperty(StylePropertyOffset, out Vector2 offset))
+                    return offset;
+            }
+
+            return _offset ?? Vector2.Zero;
+        }
+        set
+        {
+            var oldOffset = _offset;
+            _offset = value;
+
+            if (oldOffset != value)
+            {
+                InvalidateArrange();
+            }
+        }
+    }
+
+    protected override void ArrangeCore(UIBox2 finalRect)
+    {
+        finalRect.Left += Offset.X;
+        finalRect.Right += Offset.X;
+        finalRect.Top += Offset.Y;
+        finalRect.Bottom += Offset.Y;
+        base.ArrangeCore(finalRect);
+    }
+
+    protected override void Draw(DrawingHandleScreen handle)
+    {
+        var texture = Texture;
+
+        if (texture is null)
+            return;
+
+        handle.DrawTextureRect(texture, GetDrawDimensions());
+    }
+
+    private UIBox2 GetDrawDimensions()
+    {
+        var (texWidth, texHeight) = Texture?.Size ?? Vector2i.Zero;
+        var width = texWidth * (PixelSize.Y / texHeight);
+        var height = (float)PixelSize.Y;
+        if (width > PixelSize.X)
+        {
+            width = PixelSize.X;
+            height = texHeight * (PixelSize.X / texWidth);
+        }
+
+        var size = new Vector2(width, height);
+        var position = (PixelSize - size) / 2 + Offset;
+
+        return UIBox2.FromDimensions(position, size);
+    }
+}

Content.Client/_Funkystation/NanoChat/CreateGroupChatPopup.xaml

@@ -0,0 +1,38 @@
+<!--
+SPDX-FileCopyrightText: 2025 EvaisaDev <mail@evaisa.dev>
+
+SPDX-License-Identifier: AGPL-3.0-or-later AND MIT
+-->
+
+<DefaultWindow xmlns="https://spacestation14.io"
+               Title="{Loc nano-chat-create-group-title}"
+               MinSize="300 150">
+    <PanelContainer StyleClasses="AngleRect">
+        <BoxContainer Orientation="Vertical" Margin="4">
+            <!-- Group Name input -->
+            <BoxContainer Orientation="Vertical" Margin="0 4">
+                <Label Text="{Loc nano-chat-group-name-label}"
+                       StyleClasses="LabelHeading" />
+                <PanelContainer StyleClasses="ButtonSquare">
+                    <LineEdit Name="GroupNameInput"
+                              PlaceHolder="{Loc nano-chat-group-name-placeholder}" />
+                </PanelContainer>
+            </BoxContainer>
+
+            <!-- Action buttons -->
+            <BoxContainer Orientation="Horizontal"
+                          HorizontalAlignment="Right"
+                          Margin="0 8 0 0">
+                <Button Name="CancelButton"
+                        Text="{Loc nano-chat-cancel}"
+                        StyleClasses="OpenRight"
+                        MinSize="80 0" />
+                <Button Name="CreateButton"
+                        Text="{Loc nano-chat-create}"
+                        StyleClasses="OpenLeft"
+                        MinSize="80 0"
+                        Disabled="True" />
+            </BoxContainer>
+        </BoxContainer>
+    </PanelContainer>
+</DefaultWindow>

Content.Client/_Funkystation/NanoChat/CreateGroupChatPopup.xaml.cs

@@ -0,0 +1,59 @@
+// SPDX-FileCopyrightText: 2025 Evaisa <evagiacosa1@gmail.com>
+// SPDX-FileCopyrightText: 2025 EvaisaDev <mail@evaisa.dev>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later AND MIT
+
+using Robust.Client.AutoGenerated;
+using Robust.Client.UserInterface.CustomControls;
+using Robust.Client.UserInterface.XAML;
+
+namespace Content.Client._Funkystation.NanoChat;
+
+[GenerateTypedNameReferences]
+public sealed partial class CreateGroupChatPopup : DefaultWindow
+{
+    public event Action<string>? OnGroupCreated;
+
+    public CreateGroupChatPopup(int maxFullNameLength)
+    {
+        RobustXamlLoader.Load(this);
+
+        ContentsContainer.Margin = new Thickness(3);
+
+        // Button handlers
+        CancelButton.OnPressed += _ => Close();
+        CreateButton.OnPressed += _ => CreateGroup();
+
+        // Input validation
+        GroupNameInput.OnTextEntered += _ => CreateGroup();
+
+        GroupNameInput.OnTextChanged += args =>
+        {
+            if (args.Text.Length > maxFullNameLength)
+                GroupNameInput.Text = args.Text[..maxFullNameLength];
+            ValidateInputs();
+        };
+    }
+
+    private void ValidateInputs()
+    {
+        var isValid = !string.IsNullOrWhiteSpace(GroupNameInput.Text);
+        CreateButton.Disabled = !isValid;
+    }
+
+    private void CreateGroup()
+    {
+        if (CreateButton.Disabled)
+            return;
+
+        var name = GroupNameInput.Text.Trim();
+        OnGroupCreated?.Invoke(name);
+        Close();
+    }
+
+    public void ClearInputs()
+    {
+        GroupNameInput.Text = string.Empty;
+        ValidateInputs();
+    }
+}

Content.Client/_Funkystation/NanoChat/EmojiPickerPopup.xaml

@@ -0,0 +1,39 @@
+<!--
+SPDX-FileCopyrightText: 2025 EvaisaDev <mail@evaisa.dev>
+
+SPDX-License-Identifier: AGPL-3.0-or-later AND MIT
+-->
+
+<DefaultWindow xmlns="https://spacestation14.io"
+               Title="{Loc nano-chat-emoji-picker}"
+               MinSize="300 400">
+    <PanelContainer StyleClasses="AngleRect">
+        <BoxContainer Orientation="Vertical" Margin="4">
+            <!-- Search box -->
+            <LineEdit Name="SearchInput"
+                      PlaceHolder="{Loc nano-chat-emoji-search}"
+                      HorizontalExpand="True"
+                      Margin="0 0 0 4" />
+
+            <!-- Emoji grid -->
+            <ScrollContainer VerticalExpand="True"
+                             HorizontalExpand="True"
+                             Margin="0 4"
+                             HScroll="0"
+                             VScroll="1">
+                <GridContainer Name="EmojiGrid"
+                               Columns="6"
+                               HorizontalExpand="True" />
+            </ScrollContainer>
+
+            <!-- Close button -->
+            <BoxContainer Orientation="Horizontal"
+                          HorizontalAlignment="Right"
+                          Margin="0 8 0 0">
+                <Button Name="EmojiCloseButton"
+                        Text="{Loc nano-chat-close}"
+                        MinSize="80 0" />
+            </BoxContainer>
+        </BoxContainer>
+    </PanelContainer>
+</DefaultWindow>

Content.Client/_Funkystation/NanoChat/EmojiPickerPopup.xaml.cs

@@ -0,0 +1,150 @@
+// SPDX-FileCopyrightText: 2025 Evaisa <evagiacosa1@gmail.com>
+// SPDX-FileCopyrightText: 2025 EvaisaDev <mail@evaisa.dev>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later AND MIT
+
+using System.Linq;
+using Content.Shared._Funkystation.NanoChat;
+using Robust.Client.AutoGenerated;
+using Robust.Client.UserInterface.Controls;
+using Robust.Client.UserInterface.CustomControls;
+using Robust.Client.UserInterface.XAML;
+using Robust.Client.ResourceManagement;
+using Robust.Client.GameObjects;
+using Robust.Client.Graphics;
+using Robust.Shared.Utility;
+using System.Numerics;
+
+namespace Content.Client._Funkystation.NanoChat;
+
+[GenerateTypedNameReferences]
+public sealed partial class EmojiPickerPopup : DefaultWindow
+{
+    private List<(string name, SpriteSpecifier specifier)> _filteredEmojis;
+    private SpriteSystem? _spriteSystem;
+
+    public event Action<string>? OnEmojiSelected;
+
+    public EmojiPickerPopup()
+    {
+        RobustXamlLoader.Load(this);
+
+        _filteredEmojis = NanoChatEmojis.EmojiSpecifiers.Select(kv => (kv.Key, kv.Value)).ToList();
+
+        ContentsContainer.Margin = new Thickness(3);
+
+        EmojiCloseButton.OnPressed += _ => Close();
+        SearchInput.OnTextChanged += OnSearchChanged;
+
+        OnResized += UpdateGridColumns;
+
+        PopulateEmojiGrid();
+        UpdateGridColumns();
+    }
+
+    private void UpdateGridColumns()
+    {
+        const int buttonSize = 48;
+        const int scrollbarWidth = 12;
+
+        var scrollContainer = EmojiGrid.Parent as ScrollContainer;
+        if (scrollContainer == null)
+            return;
+
+        var availableWidth = scrollContainer.PixelSize.X - scrollbarWidth;
+
+        if (availableWidth <= 0)
+            return;
+
+        var columns = Math.Max(1, (int) (availableWidth / buttonSize));
+        if (EmojiGrid.Columns != columns)
+        {
+            EmojiGrid.Columns = columns;
+        }
+    }
+
+    private void OnSearchChanged(LineEdit.LineEditEventArgs args)
+    {
+        var search = args.Text.ToLower().Trim();
+
+        if (string.IsNullOrEmpty(search))
+        {
+            _filteredEmojis = NanoChatEmojis.EmojiSpecifiers.Select(kv => (kv.Key, kv.Value)).ToList();
+        }
+        else
+        {
+            _filteredEmojis = NanoChatEmojis.EmojiSpecifiers
+                .Where(kv => kv.Key.Contains(search, StringComparison.OrdinalIgnoreCase))
+                .Select(kv => (kv.Key, kv.Value))
+                .ToList();
+        }
+
+        PopulateEmojiGrid();
+    }
+
+    private void PopulateEmojiGrid()
+    {
+        EmojiGrid.RemoveAllChildren();
+
+        var resCache = IoCManager.Resolve<IResourceCache>();
+        _spriteSystem ??= IoCManager.Resolve<IEntitySystemManager>().GetEntitySystem<SpriteSystem>();
+
+        foreach (var (name, specifier) in _filteredEmojis)
+        {
+            var button = new Button
+            {
+                MinSize = new Vector2(48, 48),
+                MaxSize = new Vector2(48, 48),
+                ToolTip = $":{name}:",
+            };
+
+            Texture texture;
+            switch (specifier)
+            {
+                case SpriteSpecifier.Texture texSpecifier:
+                    if (!resCache.TryGetResource<TextureResource>(texSpecifier.TexturePath, out var textureResource))
+                        continue;
+                    texture = textureResource.Texture;
+                    break;
+
+                case SpriteSpecifier.Rsi rsiSpecifier:
+                    var state = _spriteSystem.GetState(rsiSpecifier);
+                    texture = state.Frame0;
+                    break;
+
+                default:
+                    continue;
+            }
+
+            var textureRect = new TextureRect
+            {
+                Texture = texture,
+                Stretch = TextureRect.StretchMode.KeepAspect,
+                MinSize = new Vector2(32, 32),
+                MaxSize = new Vector2(32, 32),
+                HorizontalAlignment = HAlignment.Center,
+                VerticalAlignment = VAlignment.Center,
+            };
+
+            button.AddChild(textureRect);
+
+            button.OnPressed += _ =>
+            {
+                OnEmojiSelected?.Invoke($":{name}:");
+                Close();
+            };
+
+            EmojiGrid.AddChild(button);
+        }
+
+        // Recalculate columns after populating
+        UpdateGridColumns();
+    }
+
+    public static SpriteSpecifier? GetEmojiSpecifier(string emojiName)
+    {
+        return NanoChatEmojis.EmojiSpecifiers.TryGetValue(emojiName, out var specifier) ? specifier : null;
+    }
+
+    public static Dictionary<string, SpriteSpecifier> GetEmojis() => new Dictionary<string, SpriteSpecifier>(NanoChatEmojis.EmojiSpecifiers);
+}

Content.Client/_Funkystation/NanoChat/EmojiTag.cs

@@ -0,0 +1,115 @@
+// SPDX-FileCopyrightText: 2025 Evaisa <evagiacosa1@gmail.com>
+// SPDX-FileCopyrightText: 2025 EvaisaDev <mail@evaisa.dev>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later AND MIT
+
+using Robust.Client.GameObjects;
+using Robust.Client.Graphics;
+using Robust.Client.ResourceManagement;
+using Robust.Client.UserInterface;
+using Robust.Client.UserInterface.RichText;
+using Content.Shared._Funkystation.NanoChat;
+using Robust.Shared.Utility;
+using Content.Client._DV.NanoChat.UI; // DeltaV - Fix emoji alignment
+using Robust.Shared.Prototypes; // DeltaV - Emoji id for debugging
+
+namespace Content.Client._Funkystation.NanoChat;
+
+/// <summary>
+/// Markup tag for rendering emoji images inline in RichTextLabel.
+/// </summary>
+public sealed class EmojiTag : IMarkupTagHandler
+{
+    [Dependency] private readonly IResourceCache _resourceCache = default!;
+    [Dependency] private readonly IEntitySystemManager _entitySystemManager = default!;
+
+    private SpriteSystem? _spriteSystem;
+
+    public EmojiTag()
+    {
+        IoCManager.InjectDependencies(this);
+    }
+
+    public string Name => "emoji";
+
+    // Begin DeltaV - Render invalid emoji as text
+
+    private static ProtoId<NanoChatEmojiPrototype>? GetEmoji(MarkupNode node, out string text, out SpriteSpecifier? emoji)
+    {
+        if (!node.Value.TryGetString(out var emojiName))
+        {
+            // If we don't have a value, then render nothing
+            emoji = null;
+            text = string.Empty;
+            return null;
+        }
+        else if (NanoChatEmojis.EmojiSpecifiers.TryGetValue(emojiName, out emoji))
+        {
+            // If we have a valid emoji, render the emoji, but no text
+            text = string.Empty;
+            return emojiName;
+        }
+        else
+        {
+            // If we have an invalid emoji, render only text
+            text = $":{emojiName}:";
+            return emojiName;
+        }
+    }
+
+    string IMarkupTagHandler.TextBefore(MarkupNode node)
+    {
+        GetEmoji(node, out var text, out _);
+        return text;
+    }
+
+    // End DeltaV - Render invalid emoji as text
+
+    public bool TryCreateControl(MarkupNode node, out Control control)
+    {
+        control = default!;
+
+        var emojiId = GetEmoji(node, out _, out var maybeSpecifier);
+        if (maybeSpecifier is not { } specifier)
+        {
+            return false;
+        }
+
+        _spriteSystem ??= _entitySystemManager.GetEntitySystem<SpriteSystem>();
+
+        Texture texture;
+        switch (specifier)
+        {
+            case SpriteSpecifier.Texture texSpecifier:
+                if (!_resourceCache.TryGetResource<TextureResource>(texSpecifier.TexturePath, out var textureResource))
+                {
+                    return false;
+                }
+                texture = textureResource.Texture;
+                break;
+
+            case SpriteSpecifier.Rsi rsiSpecifier:
+                var state = _spriteSystem.GetState(rsiSpecifier);
+                texture = state.Frame0;
+                break;
+
+            default:
+                return false;
+        }
+
+        // Begin DeltaV - Fix emoji alignment, replace TextureRect with custom EmojiControl
+        control = new EmojiControl
+        {
+            Texture = texture,
+            SetWidth = 32f,
+            SetHeight = 32f,
+            Name = $"Emoji[{emojiId}]",
+            // Evilly hard-coded Margin and Offset, don't ask me where they come from please
+            Margin = new(5f, 0f, 2f, 0),
+            Offset = new(5f, -5f),
+        };
+        // End DeltaV
+
+        return true;
+    }
+}

Content.Client/_Funkystation/NanoChat/GroupMembersPopup.xaml

@@ -0,0 +1,32 @@
+<!--
+SPDX-FileCopyrightText: 2025 EvaisaDev <mail@evaisa.dev>
+
+SPDX-License-Identifier: AGPL-3.0-or-later AND MIT
+-->
+
+<DefaultWindow xmlns="https://spacestation14.io"
+               Title="{Loc nano-chat-group-members-title}"
+               MinSize="400 300">
+    <PanelContainer StyleClasses="AngleRect">
+        <BoxContainer Orientation="Vertical" Margin="4">
+            <!-- Member list -->
+            <ScrollContainer VerticalExpand="True"
+                             HorizontalExpand="True"
+                             Margin="0 4">
+                <BoxContainer Name="MembersList"
+                              Orientation="Vertical"
+                              VerticalExpand="True"
+                              HorizontalExpand="True" />
+            </ScrollContainer>
+
+            <!-- Action buttons -->
+            <BoxContainer Orientation="Horizontal"
+                          HorizontalAlignment="Right"
+                          Margin="0 8 0 0">
+                <Button Name="MembersCloseButton"
+                        Text="{Loc nano-chat-close}"
+                        MinSize="80 0" />
+            </BoxContainer>
+        </BoxContainer>
+    </PanelContainer>
+</DefaultWindow>

Content.Client/_Funkystation/NanoChat/GroupMembersPopup.xaml.cs

@@ -0,0 +1,201 @@
+// SPDX-FileCopyrightText: 2025 Evaisa <evagiacosa1@gmail.com>
+// SPDX-FileCopyrightText: 2025 EvaisaDev <mail@evaisa.dev>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later AND MIT
+
+using System.Linq;
+using System.Numerics;
+using Content.Client.Resources;
+using Content.Shared._DV.CartridgeLoader.Cartridges;
+using Robust.Client.AutoGenerated;
+using Robust.Client.UserInterface.Controls;
+using Robust.Client.UserInterface.CustomControls;
+using Robust.Client.UserInterface.XAML;
+using Robust.Shared.IoC;
+using Robust.Client.ResourceManagement;
+
+namespace Content.Client._Funkystation.NanoChat;
+
+[GenerateTypedNameReferences]
+public sealed partial class GroupMembersPopup : DefaultWindow
+{
+    private List<NanoChatRecipient> _allContacts = new();
+    private HashSet<uint> _members = new();
+    private HashSet<uint> _admins = new();
+    private uint _ownNumber;
+    private uint? _creatorId;
+
+    public event Action<uint>? OnKick;
+    public event Action<uint>? OnAdmin;
+    public event Action<uint>? OnDeadmin;
+
+    public GroupMembersPopup()
+    {
+        RobustXamlLoader.Load(this);
+
+        ContentsContainer.Margin = new Thickness(3);
+
+        MembersCloseButton.OnPressed += _ => Close();
+    }
+
+    public void SetMembers(List<NanoChatRecipient> allContacts, HashSet<uint> members, uint ownNumber, uint? creatorId, HashSet<uint>? admins = null)
+    {
+        _allContacts = allContacts;
+        _members = members;
+        _ownNumber = ownNumber;
+        _creatorId = creatorId;
+        _admins = admins ?? new HashSet<uint>();
+        UpdateMembersList();
+    }
+
+    private void UpdateMembersList()
+    {
+        MembersList.RemoveAllChildren();
+
+        if (_members.Count == 0)
+        {
+            MembersList.AddChild(new Label { Text = Loc.GetString("nano-chat-no-members") });
+            return;
+        }
+
+        var isCreator = _creatorId == _ownNumber;
+        var isAdmin = _admins.Contains(_ownNumber);
+        var canManage = isCreator || isAdmin;
+
+        var memberContacts = _allContacts
+            .Where(c => _members.Contains(c.Number))
+            .OrderBy(c => c.Name)
+            .ToList();
+
+        for (var idx = 0; idx < memberContacts.Count; idx++)
+        {
+            var contact = memberContacts[idx];
+            var isEvenRow = idx % 2 == 0;
+            var isMemberAdmin = _admins.Contains(contact.Number);
+            var isMemberCreator = contact.Number == _creatorId;
+            var isSelf = contact.Number == _ownNumber;
+
+            var canKick = false;
+            if (isSelf) // can always leave yourself.
+            {
+                canKick = true;
+            }
+            else if (!isSelf && canManage && !isMemberCreator)
+            {
+                if (isCreator)
+                    canKick = true;
+                else if (isAdmin && !isMemberAdmin)
+                    canKick = true;
+            }
+
+            var canAdmin = canManage && !isSelf && !isMemberCreator && !isMemberAdmin;
+
+            var canDeadmin = canManage && !isSelf && !isMemberCreator && isMemberAdmin;
+            if (!isCreator && canDeadmin)
+                canDeadmin = false;
+
+            var contactControl = new MemberContainer(contact, isEvenRow, isMemberCreator, isMemberAdmin, isSelf, canKick, canAdmin, canDeadmin, OnKick, OnAdmin, OnDeadmin);
+            MembersList.AddChild(contactControl);
+        }
+    }
+
+    private sealed class MemberContainer : PanelContainer
+    {
+        public MemberContainer(NanoChatRecipient contact, bool isEvenRow, bool isCreator, bool isAdmin, bool isSelf, bool canKick, bool canMakeAdmin, bool canDeadmin, Action<uint>? onKick, Action<uint>? onAdmin, Action<uint>? onDeadmin)
+        {
+            HorizontalExpand = true;
+            StyleClasses.Add(isEvenRow ? "PanelBackgroundBaseDark" : "PanelBackgroundLight");
+
+            var resCache = IoCManager.Resolve<IResourceCache>();
+
+            // Show name with job title if available
+            var displayName = contact.Name;
+            if (!string.IsNullOrWhiteSpace(contact.JobTitle))
+                displayName = $"{contact.Name} ({contact.JobTitle})";
+
+            var nameLabel = new Label
+            {
+                Text = displayName + (isCreator ? $" {Loc.GetString("nano-chat-owner-suffix")}" : isAdmin ? $" {Loc.GetString("nano-chat-admin-suffix")}" : ""),
+                HorizontalAlignment = HAlignment.Left,
+                HorizontalExpand = true
+            };
+
+            var numberLabel = new Label
+            {
+                Text = $"#{contact.Number:D4}",
+                HorizontalAlignment = HAlignment.Right,
+                Margin = new Thickness(0, 0, (canKick || canMakeAdmin || canDeadmin) ? 108 : 4, 0),
+            };
+
+            AddChild(nameLabel);
+            AddChild(numberLabel);
+
+            // Admin/Deadmin button
+            if (canMakeAdmin)
+            {
+                var adminButton = new Button
+                {
+                    HorizontalAlignment = HAlignment.Right,
+                    MinSize = new Vector2(32, 32),
+                    MaxSize = new Vector2(32, 32),
+                    ToolTip = Loc.GetString("nano-chat-admin"),
+                    Margin = new Thickness(0, 0, canKick ? 72 : 36, 0),
+                };
+
+                adminButton.AddStyleClass("OpenBoth");
+                adminButton.AddChild(new TextureRect
+                {
+                    Texture = resCache.GetTexture("/Textures/_Funkystation/Interface/NanoChat/admin.png"),
+                    Stretch = TextureRect.StretchMode.KeepAspectCentered,
+                    MinSize = new Vector2(28, 28),
+                    MaxSize = new Vector2(28, 28),
+                });
+                adminButton.OnPressed += _ => onAdmin?.Invoke(contact.Number);
+
+                AddChild(adminButton);
+            }
+            else if (canDeadmin)
+            {
+                var deadminButton = new Button
+                {
+                    HorizontalAlignment = HAlignment.Right,
+                    MinSize = new Vector2(32, 32),
+                    MaxSize = new Vector2(32, 32),
+                    ToolTip = Loc.GetString("nano-chat-deadmin"),
+                    Margin = new Thickness(0, 0, canKick ? 72 : 36, 0),
+                };
+
+                deadminButton.AddStyleClass("OpenBoth");
+                deadminButton.AddChild(new TextureRect
+                {
+                    Texture = resCache.GetTexture("/Textures/_Funkystation/Interface/NanoChat/deadmin.png"),
+                    Stretch = TextureRect.StretchMode.KeepAspectCentered,
+                    MinSize = new Vector2(28, 28),
+                    MaxSize = new Vector2(28, 28),
+                });
+                deadminButton.OnPressed += _ => onDeadmin?.Invoke(contact.Number);
+
+                AddChild(deadminButton);
+            }
+
+            // Kick/Leave button
+            if (canKick)
+            {
+                var kickButton = new Button
+                {
+                    Text = isSelf ? Loc.GetString("nano-chat-leave") : "X",
+                    HorizontalAlignment = HAlignment.Right,
+                    MinSize = new Vector2(isSelf ? 64 : 32, 32),
+                    MaxSize = new Vector2(isSelf ? 64 : 32, 32),
+                    ToolTip = isSelf ? Loc.GetString("nano-chat-leave") : Loc.GetString("nano-chat-kick"),
+                    Margin = new Thickness(0, 0, 36, 0),
+                };
+
+                kickButton.AddStyleClass("OpenBoth");
+                kickButton.OnPressed += _ => onKick?.Invoke(contact.Number);
+
+                AddChild(kickButton);
+            }
+        }
+    }
+}

Content.Client/_Funkystation/NanoChat/InviteToGroupPopup.xaml

@@ -0,0 +1,43 @@
+<!--
+SPDX-FileCopyrightText: 2025 EvaisaDev <mail@evaisa.dev>
+
+SPDX-License-Identifier: AGPL-3.0-or-later AND MIT
+-->
+
+<DefaultWindow xmlns="https://spacestation14.io"
+               xmlns:controls="clr-namespace:Content.Client.UserInterface.Controls"
+               Title="{Loc nano-chat-invite-to-group-title}"
+               MinSize="400 300">
+    <PanelContainer StyleClasses="AngleRect">
+        <BoxContainer Orientation="Vertical" Margin="4">
+            <!-- Search input -->
+            <BoxContainer Orientation="Vertical" Margin="0 4">
+                <Label Text="{Loc nano-chat-search-label}"
+                       StyleClasses="LabelHeading" />
+                <PanelContainer StyleClasses="ButtonSquare">
+                    <LineEdit Name="SearchInput"
+                              PlaceHolder="{Loc nano-chat-search-placeholder}" />
+                </PanelContainer>
+            </BoxContainer>
+
+            <!-- Contact list -->
+            <ScrollContainer VerticalExpand="True"
+                             HorizontalExpand="True"
+                             Margin="0 4">
+                <BoxContainer Name="ContactsList"
+                              Orientation="Vertical"
+                              VerticalExpand="True"
+                              HorizontalExpand="True" />
+            </ScrollContainer>
+
+            <!-- Action buttons -->
+            <BoxContainer Orientation="Horizontal"
+                          HorizontalAlignment="Right"
+                          Margin="0 8 0 0">
+                <Button Name="InviteCloseButton"
+                        Text="{Loc nano-chat-close}"
+                        MinSize="80 0" />
+            </BoxContainer>
+        </BoxContainer>
+    </PanelContainer>
+</DefaultWindow>

Content.Client/_Funkystation/NanoChat/InviteToGroupPopup.xaml.cs

@@ -0,0 +1,191 @@
+// SPDX-FileCopyrightText: 2025 Evaisa <evagiacosa1@gmail.com>
+// SPDX-FileCopyrightText: 2025 EvaisaDev <mail@evaisa.dev>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later AND MIT
+
+using System.Linq;
+using System.Numerics;
+using Content.Shared._DV.CartridgeLoader.Cartridges;
+using Content.Shared.Roles;
+using Robust.Client.AutoGenerated;
+using Robust.Client.UserInterface.Controls;
+using Robust.Client.UserInterface.CustomControls;
+using Robust.Client.UserInterface.XAML;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Utility;
+
+namespace Content.Client._Funkystation.NanoChat;
+
+[GenerateTypedNameReferences]
+public sealed partial class InviteToGroupPopup : DefaultWindow
+{
+    private List<NanoChatRecipient> _allContacts = new();
+    private HashSet<uint> _existingMembers = new();
+    private uint _ownNumber;
+
+    public event Action<uint>? OnInvite;
+
+    public InviteToGroupPopup()
+    {
+        RobustXamlLoader.Load(this);
+
+        ContentsContainer.Margin = new Thickness(3);
+
+        InviteCloseButton.OnPressed += _ => Close();
+
+        SearchInput.OnTextChanged += _ => UpdateContactList();
+    }
+
+    public void SetContacts(List<NanoChatRecipient> contacts, HashSet<uint> existingMembers, uint ownNumber)
+    {
+        _allContacts = contacts;
+        _existingMembers = existingMembers;
+        _ownNumber = ownNumber;
+        UpdateContactList();
+    }
+
+    private void UpdateContactList()
+    {
+        ContactsList.RemoveAllChildren();
+
+        if (_allContacts.Count == 0)
+        {
+            ContactsList.AddChild(new Label { Text = Loc.GetString("nano-chat-look-up-no-server") });
+            return;
+        }
+
+        var searchText = SearchInput.Text.ToLower();
+        var filteredContacts = _allContacts
+            .Where(c => c.Number != _ownNumber &&
+                !_existingMembers.Contains(c.Number) &&
+                (string.IsNullOrWhiteSpace(searchText) ||
+                    c.Name.ToLower().Contains(searchText) ||
+                    c.Number.ToString().Contains(searchText) ||
+                    (!string.IsNullOrWhiteSpace(c.JobTitle) && c.JobTitle.ToLower().Contains(searchText))))
+            .ToList();
+
+        if (filteredContacts.Count == 0)
+        {
+            ContactsList.AddChild(new Label { Text = Loc.GetString("nano-chat-no-results") });
+            return;
+        }
+
+        // Group contacts by department like crew manifest
+        var prototypeManager = IoCManager.Resolve<IPrototypeManager>();
+        var departmentGroups = new Dictionary<DepartmentPrototype, List<NanoChatRecipient>>();
+        var noDepartmentContacts = new List<NanoChatRecipient>();
+
+        foreach (var contact in filteredContacts)
+        {
+            if (!string.IsNullOrWhiteSpace(contact.Department) &&
+                prototypeManager.TryIndex<DepartmentPrototype>(contact.Department, out var dept))
+            {
+                departmentGroups.GetOrNew(dept).Add(contact);
+            }
+            else
+            {
+                noDepartmentContacts.Add(contact);
+            }
+        }
+
+        // Sort departments by weight
+        var sortedDepartments = departmentGroups.Keys.ToList();
+        sortedDepartments.Sort(DepartmentUIComparer.Instance);
+
+        var rowIndex = 0;
+        foreach (var department in sortedDepartments)
+        {
+            var departmentContacts = departmentGroups[department];
+            departmentContacts.Sort((a, b) => string.CompareOrdinal(a.Name, b.Name));
+
+            // Add department header
+            ContactsList.AddChild(new Label
+            {
+                Text = Loc.GetString(department.Name),
+                StyleClasses = { "LabelBig" },
+                Margin = new Thickness(0, rowIndex == 0 ? 0 : 8, 0, 2)
+            });
+
+            foreach (var contact in departmentContacts)
+            {
+                var isEvenRow = rowIndex % 2 == 0;
+                var contactControl = new ContactContainer(contact, isEvenRow, OnInvite);
+                ContactsList.AddChild(contactControl);
+                rowIndex++;
+            }
+        }
+
+        // Add contacts without departments at the end
+        if (noDepartmentContacts.Count > 0)
+        {
+            noDepartmentContacts.Sort((a, b) => string.CompareOrdinal(a.Name, b.Name));
+
+            if (sortedDepartments.Count > 0)
+            {
+                ContactsList.AddChild(new Label
+                {
+                    Text = Loc.GetString("nano-chat-other-department"),
+                    StyleClasses = { "LabelBig" },
+                    Margin = new Thickness(0, 8, 0, 2)
+                });
+            }
+
+            foreach (var contact in noDepartmentContacts)
+            {
+                var isEvenRow = rowIndex % 2 == 0;
+                var contactControl = new ContactContainer(contact, isEvenRow, OnInvite);
+                ContactsList.AddChild(contactControl);
+                rowIndex++;
+            }
+        }
+    }
+
+    public void ClearSearch()
+    {
+        SearchInput.Text = string.Empty;
+    }
+
+    private sealed class ContactContainer : PanelContainer
+    {
+        public ContactContainer(NanoChatRecipient contact, bool isEvenRow, Action<uint>? onInvite)
+        {
+            HorizontalExpand = true;
+            StyleClasses.Add(isEvenRow ? "PanelBackgroundBaseDark" : "PanelBackgroundLight");
+
+            // Show name with job title if available
+            var displayName = contact.Name;
+            if (!string.IsNullOrWhiteSpace(contact.JobTitle))
+                displayName = $"{contact.Name} ({contact.JobTitle})";
+
+            var nameLabel = new Label
+            {
+                Text = displayName,
+                HorizontalAlignment = HAlignment.Left,
+                HorizontalExpand = true
+            };
+
+            var numberLabel = new Label
+            {
+                Text = $"#{contact.Number:D4}",
+                HorizontalAlignment = HAlignment.Right,
+                Margin = new Thickness(0, 0, 36, 0),
+            };
+
+            var inviteButton = new Button
+            {
+                Text = "+",
+                HorizontalAlignment = HAlignment.Right,
+                MinSize = new Vector2(32, 32),
+                MaxSize = new Vector2(32, 32),
+                ToolTip = Loc.GetString("nano-chat-invite"),
+            };
+
+            inviteButton.AddStyleClass("OpenBoth");
+            inviteButton.OnPressed += _ => onInvite?.Invoke(contact.Number);
+
+            AddChild(nameLabel);
+            AddChild(numberLabel);
+            AddChild(inviteButton);
+        }
+    }
+}

Content.Server/_DV/CartridgeLoader/Cartridges/NanoChatCartridgeSystem.cs

@@ -46,11 +46,17 @@ public sealed class NanoChatCartridgeSystem : EntitySystem
 
         SubscribeLocalEvent<NanoChatCartridgeComponent, CartridgeUiReadyEvent>(OnUiReady);
         SubscribeLocalEvent<NanoChatCartridgeComponent, CartridgeMessageEvent>(OnMessage);
+        SubscribeLocalEvent<NanoChatCartridgeComponent, MapInitEvent>(OnMapInit);
 
         Subs.CVar(_cfg, CCVars.MaxNameLength, x => _maxNameLength = x, true);
         Subs.CVar(_cfg, CCVars.MaxIdJobLength, x => _maxIdJobLength = x, true);
     }
 
+    private void OnMapInit(Entity<NanoChatCartridgeComponent> ent, ref MapInitEvent args)
+    {
+        UpdateUIForAllCards();
+    }
+
     private void UpdateClosed(Entity<NanoChatCartridgeComponent> ent)
     {
         if (!TryComp<CartridgeComponent>(ent, out var cartridge) ||
@@ -124,7 +130,7 @@ public sealed class NanoChatCartridgeSystem : EntitySystem
                 HandleCloseChat(card);
                 break;
             case NanoChatUiMessageType.ToggleMute:
-                HandleToggleMute(card);
+                HandleToggleMute(card, msg);
                 break;
             case NanoChatUiMessageType.ToggleMuteChat:
                 HandleToggleMuteChat(card, msg);
@@ -136,7 +142,22 @@ public sealed class NanoChatCartridgeSystem : EntitySystem
                 HandleSendMessage(ent, card, msg);
                 break;
             case NanoChatUiMessageType.ToggleListNumber:
-                HandleToggleListNumber(card);
+                HandleToggleListNumber(card, msg);
+                break;
+            case NanoChatUiMessageType.CreateGroupChat:
+                HandleCreateGroupChat(card, msg);
+                break;
+            case NanoChatUiMessageType.InviteToGroup:
+                HandleInviteToGroup(card, msg);
+                break;
+            case NanoChatUiMessageType.KickFromGroup:
+                HandleKickFromGroup(card, msg);
+                break;
+            case NanoChatUiMessageType.AdminUser:
+                HandleAdminUser(card, msg);
+                break;
+            case NanoChatUiMessageType.DeadminUser:
+                HandleDeadminUser(card, msg);
                 break;
         }
 
@@ -190,16 +211,24 @@ public sealed class NanoChatCartridgeSystem : EntitySystem
         }
 
         // Add new recipient
-        var recipient = new NanoChatRecipient(msg.RecipientNumber.Value,
+        var recipient = new NanoChatRecipient(
+            msg.RecipientNumber.Value,
             name,
-            jobTitle);
+            jobTitle,
+            null,
+            false,
+            false,
+            null,
+            null,
+            null
+        );
 
         // Initialize or update recipient
         _nanoChat.SetRecipient((card, card.Comp), msg.RecipientNumber.Value, recipient);
 
         _adminLogger.Add(LogType.Action,
             LogImpact.Low,
-            $"{ToPrettyString(msg.Actor):user} created new NanoChat conversation with #{msg.RecipientNumber:D4} ({name})");
+            $"{ToPrettyString(msg.Actor)} created new NanoChat conversation with #{msg.RecipientNumber:D4} ({name})");
 
         var recipientEv = new NanoChatRecipientUpdatedEvent(card);
         RaiseLocalEvent(ref recipientEv);
@@ -277,15 +306,65 @@ public sealed class NanoChatCartridgeSystem : EntitySystem
         if (msg.RecipientNumber == null || card.Comp.Number == null)
             return;
 
+        var chatNumber = msg.RecipientNumber.Value;
+        var recipient = _nanoChat.GetRecipient((card, card.Comp), chatNumber);
+
+        if (recipient is { IsGroup: true } groupChat)
+        {
+            var members = groupChat.Members ?? new HashSet<uint>();
+            if (members.Remove(card.Comp.Number.Value))
+            {
+                var admins = groupChat.Admins ?? new HashSet<uint>();
+                admins.Remove(card.Comp.Number.Value);
+
+                // If the creator is leaving, transfer ownership
+                uint? newCreatorId = groupChat.CreatorId;
+                var isCreatorLeaving = card.Comp.Number.Value == groupChat.CreatorId;
+                if (isCreatorLeaving)
+                {
+                    if (admins.Count > 0)
+                    {
+                        newCreatorId = admins.First();
+                    }
+                    else if (members.Count > 0)
+                    {
+                        newCreatorId = members.First();
+                    }
+                    else
+                    {
+                        newCreatorId = null;
+                    }
+                }
+
+                // Update the group for all remaining members
+                var updatedRecipient = newCreatorId != null
+                    ? groupChat with { Members = members, Admins = admins, CreatorId = newCreatorId }
+                    : groupChat with { Members = members, Admins = admins };
+
+                foreach (var memberNumber in members)
+                {
+                    var cardQuery = EntityQueryEnumerator<NanoChatCardComponent>();
+                    while (cardQuery.MoveNext(out var memberCardUid, out var memberCard))
+                    {
+                        if (memberCard.Number == memberNumber)
+                        {
+                            _nanoChat.SetRecipient((memberCardUid, memberCard), chatNumber, updatedRecipient);
+                            UpdateUIForCard(memberCardUid);
+                        }
+                    }
+                }
+            }
+        }
+
         // Delete chat but keep the messages
-        var deleted = _nanoChat.TryDeleteChat((card, card.Comp), msg.RecipientNumber.Value, true);
+        var deleted = _nanoChat.TryDeleteChat((card, card.Comp), chatNumber, true);
 
         if (!deleted)
             return;
 
         _adminLogger.Add(LogType.Action,
             LogImpact.Low,
-            $"{ToPrettyString(msg.Actor):user} deleted NanoChat conversation with #{msg.RecipientNumber:D4}");
+            $"{ToPrettyString(msg.Actor)} deleted NanoChat conversation with #{chatNumber:D4}");
 
         UpdateUIForCard(card);
     }
@@ -293,9 +372,15 @@ public sealed class NanoChatCartridgeSystem : EntitySystem
     /// <summary>
     ///     Handles toggling notification mute state.
     /// </summary>
-    private void HandleToggleMute(Entity<NanoChatCardComponent> card)
+    private void HandleToggleMute(Entity<NanoChatCardComponent> card, NanoChatUiMessageEvent msg)
     {
-        _nanoChat.SetNotificationsMuted((card, card.Comp), !_nanoChat.GetNotificationsMuted((card, card.Comp)));
+        var muted = _nanoChat.GetNotificationsMuted((card, card.Comp));
+        _nanoChat.SetNotificationsMuted((card, card.Comp), !muted);
+
+        _adminLogger.Add(LogType.Chat,
+            LogImpact.Low,
+            $"{ToPrettyString(msg.Actor)} {(muted ? "un" : "")}muted the NanoChat on {ToPrettyString(card)}");
+
         UpdateUIForCard(card);
     }
 
@@ -303,13 +388,25 @@ public sealed class NanoChatCartridgeSystem : EntitySystem
     {
         if (msg.RecipientNumber is not uint chat)
             return;
+
         _nanoChat.ToggleChatMuted((card, card.Comp), chat);
+
+        _adminLogger.Add(LogType.Chat,
+            LogImpact.Low,
+            $"{ToPrettyString(msg.Actor)} toggled NanoChat notifcations for chat #{chat:D4} on {ToPrettyString(card)}");
+
         UpdateUIForCard(card);
     }
 
-    private void HandleToggleListNumber(Entity<NanoChatCardComponent> card)
+    private void HandleToggleListNumber(Entity<NanoChatCardComponent> card, NanoChatUiMessageEvent msg)
     {
-        _nanoChat.SetListNumber((card, card.Comp), !_nanoChat.GetListNumber((card, card.Comp)));
+        var numberListed = _nanoChat.GetListNumber((card, card.Comp));
+        _nanoChat.SetListNumber((card, card.Comp), !numberListed);
+
+        _adminLogger.Add(LogType.Chat,
+            LogImpact.Low,
+            $"{ToPrettyString(msg.Actor)} toggled the NanoChat listing of {ToPrettyString(card)} {(numberListed ? "off" : "on")}");
+
         UpdateUIForAllCards();
     }
 
@@ -323,7 +420,11 @@ public sealed class NanoChatCartridgeSystem : EntitySystem
         if (msg.RecipientNumber == null || msg.Content == null || card.Comp.Number == null)
             return;
 
-        if (!EnsureRecipientExists(card, msg.RecipientNumber.Value))
+        var recipient = _nanoChat.GetRecipient((card, card.Comp), msg.RecipientNumber.Value);
+        var isGroupChat = recipient?.IsGroup ?? false;
+
+        // Only ensure recipient exists for non-group chats
+        if (!isGroupChat && !EnsureRecipientExists(card, msg.RecipientNumber.Value))
             return;
 
         var content = msg.Content;
@@ -341,8 +442,19 @@ public sealed class NanoChatCartridgeSystem : EntitySystem
             (uint)card.Comp.Number
         );
 
-        // Attempt delivery
+        List<Entity<NanoChatCardComponent>> recipients;
-        var (deliveryFailed, recipients) = AttemptMessageDelivery(cartridge, msg.RecipientNumber.Value);
+        bool deliveryFailed;
+
+        if (isGroupChat && recipient != null)
+        {
+            // For group chats, deliver to all members
+            (deliveryFailed, recipients) = AttemptGroupMessageDelivery(cartridge, recipient.Value, card.Comp.Number.Value);
+        }
+        else
+        {
+            // For regular chats, deliver to single recipient
+            (deliveryFailed, recipients) = AttemptMessageDelivery(cartridge, msg.RecipientNumber.Value);
+        }
 
         // Update delivery status
         message = message with { DeliveryFailed = deliveryFailed };
@@ -357,7 +469,7 @@ public sealed class NanoChatCartridgeSystem : EntitySystem
 
         _adminLogger.Add(LogType.Chat,
             LogImpact.Low,
-            $"{ToPrettyString(card):user} sent NanoChat message to {recipientsText}: {content}{(deliveryFailed ? " [DELIVERY FAILED]" : "")}");
+            $"{ToPrettyString(msg.Actor)} sent NanoChat message to {recipientsText}: {content}{(deliveryFailed ? " [DELIVERY FAILED]" : "")}");
 
         var msgEv = new NanoChatMessageReceivedEvent(card);
         RaiseLocalEvent(ref msgEv);
@@ -365,9 +477,9 @@ public sealed class NanoChatCartridgeSystem : EntitySystem
         if (deliveryFailed)
             return;
 
-        foreach (var recipient in recipients)
+        foreach (var recipientCard in recipients)
         {
-            DeliverMessageToRecipient(card, recipient, message);
+            DeliverMessageToRecipient(card, recipientCard, message, msg.RecipientNumber.Value, recipient);
         }
     }
 
@@ -480,27 +592,88 @@ public sealed class NanoChatCartridgeSystem : EntitySystem
     /// <param name="sender">The sender's card entity</param>
     /// <param name="recipient">The recipient's card entity</param>
     /// <param name="message">The <see cref="NanoChatMessage" /> to deliver</param>
+    /// <param name="chatNumber">The chat number (for group chats, this is the group number)</param>
+    /// <param name="groupRecipient">Optional group recipient info if this is a group chat</param>
     private void DeliverMessageToRecipient(Entity<NanoChatCardComponent> sender,
         Entity<NanoChatCardComponent> recipient,
-        NanoChatMessage message)
+        NanoChatMessage message,
+        uint chatNumber,
+        NanoChatRecipient? groupRecipient = null)
     {
         if (sender.Comp.Number is not uint senderNumber)
             return;
 
-        // Always try to get and add sender info to recipient's contacts
+        // For group chats, use the group number. For regular chats, use the sender's number
-        if (!EnsureRecipientExists(recipient, senderNumber))
+        var recipientNumber = (groupRecipient != null && groupRecipient.Value.IsGroup) ? chatNumber : senderNumber;
+
+        if (groupRecipient != null && groupRecipient.Value.IsGroup)
+        {
+            var existingRecipient = _nanoChat.GetRecipient((recipient, recipient.Comp), recipientNumber);
+
+            if (existingRecipient == null || !existingRecipient.Value.IsGroup)
+            {
+                _nanoChat.SetRecipient((recipient, recipient.Comp), recipientNumber, groupRecipient.Value);
+            }
+            else if (groupRecipient.Value.Members != null)
+            {
+                var existingMembers = existingRecipient.Value.Members ?? new HashSet<uint>();
+                if (!existingMembers.SetEquals(groupRecipient.Value.Members))
+                {
+                    _nanoChat.SetRecipient((recipient, recipient.Comp), recipientNumber, groupRecipient.Value);
+                }
+                else
+                {
+                    var existingAdmins = existingRecipient.Value.Admins ?? new HashSet<uint>();
+                    var groupAdmins = groupRecipient.Value.Admins ?? new HashSet<uint>();
+                    if (!existingAdmins.SetEquals(groupAdmins))
+                    {
+                        _nanoChat.SetRecipient((recipient, recipient.Comp), recipientNumber, groupRecipient.Value);
+                    }
+                }
+            }
+        }
+        else if (!EnsureRecipientExists(recipient, recipientNumber))
+        {
             return;
+        }
 
-        _nanoChat.AddMessage((recipient, recipient.Comp), senderNumber, message with { DeliveryFailed = false });
+        _nanoChat.AddMessage((recipient, recipient.Comp), recipientNumber, message with { DeliveryFailed = false });
 
-        if (recipient.Comp.IsClosed || _nanoChat.GetCurrentChat((recipient, recipient.Comp)) != senderNumber)
+        if (recipient.Comp.IsClosed || _nanoChat.GetCurrentChat((recipient, recipient.Comp)) != recipientNumber)
-            HandleUnreadNotification(recipient, message, senderNumber);
+            HandleUnreadNotification(recipient, message, recipientNumber);
 
         var msgEv = new NanoChatMessageReceivedEvent(recipient);
         RaiseLocalEvent(ref msgEv);
         UpdateUIForCard(recipient);
     }
 
+    /// <summary>
+    ///     Attempts to deliver a message to all members of a group chat.
+    /// </summary>
+    private (bool failed, List<Entity<NanoChatCardComponent>> recipients) AttemptGroupMessageDelivery(
+        Entity<NanoChatCartridgeComponent> sender,
+        NanoChatRecipient groupRecipient,
+        uint senderNumber)
+    {
+        if (groupRecipient.Members == null)
+            return (true, new List<Entity<NanoChatCardComponent>>());
+
+        var deliverableRecipients = new List<Entity<NanoChatCardComponent>>();
+
+        foreach (var memberNumber in groupRecipient.Members)
+        {
+            if (memberNumber == senderNumber)
+                continue;
+
+            var (failed, memberCards) = AttemptMessageDelivery(sender, memberNumber);
+            if (!failed)
+                deliverableRecipients.AddRange(memberCards);
+        }
+
+        // Delivery failed if no recipients could receive the message
+        return (deliverableRecipients.Count == 0, deliverableRecipients);
+    }
+
     /// <summary>
     ///     Handles unread message notifications and updates unread status.
     /// </summary>
@@ -510,21 +683,21 @@ public sealed class NanoChatCartridgeSystem : EntitySystem
     {
         // Get sender name from contacts or fall back to number
         var recipients = _nanoChat.GetRecipients((recipient, recipient.Comp));
-        var senderName = recipients.TryGetValue(message.SenderId, out var senderRecipient)
+        var senderName = recipients.TryGetValue(senderNumber, out var senderRecipient)
             ? senderRecipient.Name
-            : $"#{message.SenderId:D4}";
+            : $"#{senderNumber:D4}";
         var hasSelectedCurrentChat = _nanoChat.GetCurrentChat((recipient, recipient.Comp)) == senderNumber;
 
         // Update unread status
         if (!hasSelectedCurrentChat)
             _nanoChat.SetRecipient((recipient, recipient.Comp),
-                message.SenderId,
+                senderNumber,
                 senderRecipient with { HasUnread = true });
 
         // Temporary local to avoid trouble with read-only access; Contains doesn't modify the collection
         HashSet<uint> mutedChats = recipient.Comp.MutedChats;
         if (recipient.Comp.NotificationsMuted ||
-            mutedChats.Contains(message.SenderId) ||
+            mutedChats.Contains(senderNumber) ||
             recipient.Comp.PdaUid is not { } pdaUid ||
             !TryComp<CartridgeLoaderComponent>(pdaUid, out var loader) ||
             // Don't notify if the recipient has the NanoChat program open with this chat selected.
@@ -593,14 +766,27 @@ public sealed class NanoChatCartridgeSystem : EntitySystem
 
             // Try to get job title from ID card if possible
             string? jobTitle = null;
+            string? department = null;
             var name = "Unknown";
             if (TryComp<IdCardComponent>(uid, out var idCard))
             {
                 jobTitle = idCard.LocalizedJobTitle;
                 name = idCard.FullName ?? name;
+                if (idCard.JobDepartments is { } depts && depts.Count > 0)
+                    department = depts[0].ToString();
             }
 
-            return new NanoChatRecipient(number, name, jobTitle);
+            return new NanoChatRecipient(
+                number,
+                name,
+                jobTitle,
+                department,
+                false,
+                false,
+                null,
+                null,
+                null
+            );
         }
 
         return null;
@@ -624,12 +810,34 @@ public sealed class NanoChatCartridgeSystem : EntitySystem
             var query = AllEntityQuery<NanoChatCardComponent, IdCardComponent>();
             while (query.MoveNext(out var entityId, out var nanoChatCard, out var idCardComponent))
             {
-                if (nanoChatCard.ListNumber && nanoChatCard.Number is uint nanoChatNumber && idCardComponent.FullName is string fullName && _station.GetOwningStation(entityId) == station)
+                if (!nanoChatCard.ListNumber)
-                {
+                    continue;
-                    contacts.Add(new NanoChatRecipient(nanoChatNumber, fullName));
+                if (nanoChatCard.PdaUid is null)
-                }
+                    continue;
+                if (nanoChatCard.Number is not { } nanoChatNumber)
+                    continue;
+                if (idCardComponent.FullName is not { } fullName)
+                    continue;
+                if (_station.GetOwningStation(entityId) != station)
+                    continue;
+
+                string? department = null;
+                if (idCardComponent.JobDepartments is { } depts && depts.Count > 0)
+                    department = depts[0].ToString();
+
+                contacts.Add(new NanoChatRecipient(
+                    nanoChatNumber,
+                    fullName,
+                    idCardComponent.LocalizedJobTitle,
+                    department,
+                    false,
+                    false,
+                    null,
+                    null,
+                    null
+                ));
             }
-            contacts.Sort((contactA, contactB) => string.CompareOrdinal(contactA.Name, contactB.Name));
+            contacts.Sort();
         }
         else
         {
@@ -668,4 +876,314 @@ public sealed class NanoChatCartridgeSystem : EntitySystem
             listNumber);
         _cartridge.UpdateCartridgeUiState(loader, state);
     }
+
+    /// <summary>
+    ///     Handles creation of a new group chat.
+    /// </summary>
+    private void HandleCreateGroupChat(Entity<NanoChatCardComponent> card, NanoChatUiMessageEvent msg)
+    {
+        if (msg.Content == null || card.Comp.Number == null)
+            return;
+
+        var name = msg.Content;
+        if (!string.IsNullOrWhiteSpace(name))
+        {
+            name = name.Trim();
+            if (name.Length > _maxNameLength)
+                name = name[.._maxNameLength];
+        }
+
+        // Generate a unique group number (surely unique I actually have no idea how to generate good unique numbers.)
+        var groupNumber = (uint)(HashCode.Combine(card.Comp.Number.Value, _timing.CurTime.Ticks) & 0x7FFFFFFF);
+
+        // This fucking sucks (fire emoji)
+        while (_nanoChat.GetRecipient((card, card.Comp), groupNumber) != null)
+        {
+            groupNumber++;
+        }
+
+        // Create group chat recipient
+        var recipient = new NanoChatRecipient(
+            groupNumber,
+            name,
+            null,
+            null,
+            false,
+            true,
+            [card.Comp.Number.Value],
+            card.Comp.Number.Value,
+            null
+        );
+
+        _nanoChat.SetRecipient((card, card.Comp), groupNumber, recipient);
+
+        _adminLogger.Add(LogType.Action,
+            LogImpact.Low,
+            $"{ToPrettyString(msg.Actor)} created group chat '{name}' (#{groupNumber:D4})");
+
+        var recipientEv = new NanoChatRecipientUpdatedEvent(card);
+        RaiseLocalEvent(ref recipientEv);
+        UpdateUIForCard(card);
+    }
+
+    /// <summary>
+    ///     Handles inviting a user to a group chat.
+    /// </summary>
+    private void HandleInviteToGroup(Entity<NanoChatCardComponent> card, NanoChatUiMessageEvent msg)
+    {
+        if (msg.RecipientNumber == null || msg.Content == null || card.Comp.Number == null)
+            return;
+
+        var groupNumber = msg.RecipientNumber.Value;
+        if (!uint.TryParse(msg.Content, out var inviteeNumber))
+            return;
+
+        var recipient = _nanoChat.GetRecipient((card, card.Comp), groupNumber);
+        if (recipient == null || !recipient.Value.IsGroup)
+            return;
+
+        // Only the creator or admins can invite
+        var isCreator = recipient.Value.CreatorId == card.Comp.Number.Value;
+        var admins = recipient.Value.Admins ?? new HashSet<uint>();
+        var isAdmin = admins.Contains(card.Comp.Number.Value);
+
+        if (!isCreator && !isAdmin)
+            return;
+
+        var members = recipient.Value.Members ?? new HashSet<uint>();
+        if (members.Contains(inviteeNumber))
+            return;
+
+        // Add member to group
+        members.Add(inviteeNumber);
+        var updatedRecipient = recipient.Value with { Members = members };
+        _nanoChat.SetRecipient((card, card.Comp), groupNumber, updatedRecipient);
+
+        // Update member lists for all members
+        var memberCards = new List<Entity<NanoChatCardComponent>>();
+        var cardQuery = EntityQueryEnumerator<NanoChatCardComponent>();
+        while (cardQuery.MoveNext(out var cardUid, out var memberCard))
+        {
+            if (memberCard.Number != null && members.Contains(memberCard.Number.Value))
+            {
+                memberCards.Add((cardUid, memberCard));
+            }
+        }
+
+        foreach (var memberCard in memberCards)
+        {
+            _nanoChat.SetRecipient((memberCard, memberCard.Comp), groupNumber, updatedRecipient);
+            UpdateUIForCard(memberCard);
+        }
+
+        _adminLogger.Add(LogType.Action,
+            LogImpact.Low,
+            $"{ToPrettyString(msg.Actor)} invited #{inviteeNumber:D4} to group chat #{groupNumber:D4}");
+
+        var recipientEv = new NanoChatRecipientUpdatedEvent(card);
+        RaiseLocalEvent(ref recipientEv);
+        UpdateUIForCard(card);
+    }
+
+    /// <summary>
+    ///     Handles kicking a user from a group chat.
+    /// </summary>
+    private void HandleKickFromGroup(Entity<NanoChatCardComponent> card, NanoChatUiMessageEvent msg)
+    {
+        if (msg.RecipientNumber == null || msg.Content == null || card.Comp.Number == null)
+            return;
+
+        var groupNumber = msg.RecipientNumber.Value;
+        if (!uint.TryParse(msg.Content, out var kickeeNumber))
+            return;
+
+        var recipient = _nanoChat.GetRecipient((card, card.Comp), groupNumber);
+        if (recipient == null || !recipient.Value.IsGroup)
+            return;
+
+        var isCreator = recipient.Value.CreatorId == card.Comp.Number.Value;
+        var admins = recipient.Value.Admins ?? new HashSet<uint>();
+        var isAdmin = admins.Contains(card.Comp.Number.Value);
+        var isSelfKick = kickeeNumber == card.Comp.Number.Value;
+
+        if (!isSelfKick && !isCreator && !isAdmin)
+            return;
+
+        // Allow creator to leave the group but not be kicked by other members.
+        var isCreatorLeaving = kickeeNumber == recipient.Value.CreatorId && isCreator;
+        if (kickeeNumber == recipient.Value.CreatorId && !isCreatorLeaving)
+            return;
+
+        // Find all cards belonging to the kickee
+        var kickeeCards = new List<Entity<NanoChatCardComponent>>();
+        var cardQuery = EntityQueryEnumerator<NanoChatCardComponent>();
+        while (cardQuery.MoveNext(out var cardUid, out var kickeeCard))
+        {
+            if (kickeeCard.Number == kickeeNumber)
+            {
+                kickeeCards.Add((cardUid, kickeeCard));
+            }
+        }
+
+        foreach (var kickeeCard in kickeeCards)
+        {
+            var deleteMsg = new NanoChatUiMessageEvent(NanoChatUiMessageType.DeleteChat, groupNumber, null, null)
+            {
+                Actor = msg.Actor
+            };
+            HandleDeleteChat(kickeeCard, deleteMsg);
+        }
+
+        if (isCreatorLeaving)
+        {
+            _adminLogger.Add(LogType.Action,
+                LogImpact.Low,
+                $"{ToPrettyString(msg.Actor)} left group chat #{groupNumber:D4}");
+        }
+        else
+        {
+            _adminLogger.Add(LogType.Action,
+                LogImpact.Low,
+                $"{ToPrettyString(msg.Actor)} kicked #{kickeeNumber:D4} from group chat #{groupNumber:D4}");
+        }
+
+        var recipientEv = new NanoChatRecipientUpdatedEvent(card);
+        RaiseLocalEvent(ref recipientEv);
+        UpdateUIForCard(card);
+    }
+
+    /// <summary>
+    ///     Handles promoting a user to admin in a group chat.
+    /// </summary>
+    private void HandleAdminUser(Entity<NanoChatCardComponent> card, NanoChatUiMessageEvent msg)
+    {
+        if (msg.RecipientNumber == null || msg.Content == null || card.Comp.Number == null)
+            return;
+
+        var groupNumber = msg.RecipientNumber.Value;
+        if (!uint.TryParse(msg.Content, out var targetNumber))
+            return;
+
+        var recipient = _nanoChat.GetRecipient((card, card.Comp), groupNumber);
+        if (recipient == null || !recipient.Value.IsGroup)
+            return;
+
+        // Only the creator or admins can make admins
+        var isCreator = recipient.Value.CreatorId == card.Comp.Number.Value;
+        var admins = recipient.Value.Admins ?? new HashSet<uint>();
+        var isAdmin = admins.Contains(card.Comp.Number.Value);
+
+        if (!isCreator && !isAdmin)
+            return;
+
+        var members = recipient.Value.Members ?? new HashSet<uint>();
+        if (!members.Contains(targetNumber))
+            return; // how tf
+
+        if (targetNumber == recipient.Value.CreatorId)
+            return;
+
+        if (!isCreator && admins.Contains(targetNumber))
+            return;
+
+        if (!admins.Add(targetNumber))
+            return;
+
+        var updatedRecipient = recipient.Value with { Admins = admins };
+        _nanoChat.SetRecipient((card, card.Comp), groupNumber, updatedRecipient);
+
+        // Sync to all members
+        foreach (var memberNumber in members)
+        {
+            var memberCards = new List<Entity<NanoChatCardComponent>>();
+            var cardQuery = EntityQueryEnumerator<NanoChatCardComponent>();
+            while (cardQuery.MoveNext(out var cardUid, out var memberCard))
+            {
+                if (memberCard.Number == memberNumber)
+                {
+                    memberCards.Add((cardUid, memberCard));
+                }
+            }
+
+            foreach (var memberCard in memberCards)
+            {
+                _nanoChat.SetRecipient((memberCard, memberCard.Comp), groupNumber, updatedRecipient);
+                UpdateUIForCard(memberCard);
+            }
+        }
+
+        _adminLogger.Add(LogType.Action,
+            LogImpact.Low,
+            $"{ToPrettyString(msg.Actor)} promoted #{targetNumber:D4} to admin in group chat #{groupNumber:D4}");
+
+        var recipientEv = new NanoChatRecipientUpdatedEvent(card);
+        RaiseLocalEvent(ref recipientEv);
+        UpdateUIForCard(card);
+    }
+
+    /// <summary>
+    ///     Handles demoting a user from admin in a group chat.
+    /// </summary>
+    private void HandleDeadminUser(Entity<NanoChatCardComponent> card, NanoChatUiMessageEvent msg)
+    {
+        if (msg.RecipientNumber == null || msg.Content == null || card.Comp.Number == null)
+            return;
+
+        var groupNumber = msg.RecipientNumber.Value;
+        if (!uint.TryParse(msg.Content, out var targetNumber))
+            return;
+
+        var recipient = _nanoChat.GetRecipient((card, card.Comp), groupNumber);
+        if (recipient == null || !recipient.Value.IsGroup)
+            return;
+
+        // Only the creator or admins can remove admins
+        var isCreator = recipient.Value.CreatorId == card.Comp.Number.Value;
+        var admins = recipient.Value.Admins ?? new HashSet<uint>();
+        var isAdmin = admins.Contains(card.Comp.Number.Value);
+
+        if (!isCreator && !isAdmin)
+            return;
+
+        var members = recipient.Value.Members ?? new HashSet<uint>();
+        if (!members.Contains(targetNumber))
+            return; // how
+
+        if (!isCreator && (targetNumber == recipient.Value.CreatorId || admins.Contains(targetNumber)))
+            return;
+
+        if (!admins.Remove(targetNumber))
+            return;
+
+        var updatedRecipient = recipient.Value with { Admins = admins };
+        _nanoChat.SetRecipient((card, card.Comp), groupNumber, updatedRecipient);
+
+        // Sync to all members
+        foreach (var memberNumber in members)
+        {
+            var memberCards = new List<Entity<NanoChatCardComponent>>();
+            var cardQuery = EntityQueryEnumerator<NanoChatCardComponent>();
+            while (cardQuery.MoveNext(out var cardUid, out var memberCard))
+            {
+                if (memberCard.Number == memberNumber)
+                {
+                    memberCards.Add((cardUid, memberCard));
+                }
+            }
+
+            foreach (var memberCard in memberCards)
+            {
+                _nanoChat.SetRecipient((memberCard, memberCard.Comp), groupNumber, updatedRecipient);
+                UpdateUIForCard(memberCard);
+            }
+        }
+
+        _adminLogger.Add(LogType.Action,
+            LogImpact.Low,
+            $"{ToPrettyString(msg.Actor)} removed admin from #{targetNumber:D4} in group chat #{groupNumber:D4}");
+
+        var recipientEv = new NanoChatRecipientUpdatedEvent(card);
+        RaiseLocalEvent(ref recipientEv);
+        UpdateUIForCard(card);
+    }
 }

Content.Shared/_DV/CartridgeLoader/Cartridges/NanoChatUiMessageEvent.cs

@@ -1,4 +1,5 @@
 using Content.Shared.CartridgeLoader;
+using Content.Shared.Roles;
 using Robust.Shared.Serialization;
 
 namespace Content.Shared._DV.CartridgeLoader.Cartridges;
@@ -57,45 +58,107 @@ public enum NanoChatUiMessageType : byte
     ToggleMute,
     ToggleMuteChat,
     ToggleListNumber,
+    CreateGroupChat,
+    InviteToGroup,
+    KickFromGroup,
+    ViewGroupMembers,
+    AdminUser,
+    DeadminUser,
 }
 
-// putting this here because i can
+/// <summary>
+///     Represents an actual NanoChat Chat
+///     Either a Group, if <paramref name="isGroup"/> is <see langword="true" />, else a normal user.
+/// </summary>
+/// <param name="number">The recipient's NanoChat number</param>
+/// <param name="name">The recipient's display name</param>
+/// <param name="jobTitle">Optional job title for the recipient</param>
+/// <param name="department">Optional department ID for the recipient</param>
+/// <param name="hasUnread">Whether there are unread messages from this recipient</param>
+/// <param name="isGroup">Whether this is a group chat</param>
+/// <param name="members">For group chats: list of member NanoChat numbers</param>
+/// <param name="creatorId">For group chats: the creator's NanoChat number</param>
+/// <param name="admins">For group chats: set of admin NanoChat numbers</param>
 [Serializable, NetSerializable, DataRecord]
-public struct NanoChatRecipient
+public struct NanoChatRecipient(
+    uint number,
+    string name,
+    string? jobTitle,
+    string? department,
+    bool hasUnread,
+    bool isGroup,
+    HashSet<uint>? members,
+    uint? creatorId,
+    HashSet<uint>? admins
+) : IComparable<NanoChatRecipient>
 {
     /// <summary>
     ///     The recipient's unique NanoChat number.
     /// </summary>
-    public uint Number;
+    public uint Number = number;
 
     /// <summary>
     ///     The recipient's display name, typically from their ID card.
     /// </summary>
-    public string Name;
+    public string Name = name;
 
     /// <summary>
     ///     The recipient's job title, if available.
     /// </summary>
-    public string? JobTitle;
+    public string? JobTitle = jobTitle;
+
+    /// <summary>
+    ///     The recipient's department ID, if available.
+    /// </summary>
+    public string? Department = department;
 
     /// <summary>
     ///     Whether this recipient has unread messages.
     /// </summary>
-    public bool HasUnread;
+    public bool HasUnread = hasUnread;
 
     /// <summary>
-    ///     Creates a new NanoChat recipient.
+    ///     Whether this is a group chat.
     /// </summary>
-    /// <param name="number">The recipient's NanoChat number</param>
+    public bool IsGroup = isGroup;
-    /// <param name="name">The recipient's display name</param>
+
-    /// <param name="jobTitle">Optional job title for the recipient</param>
+    /// <summary>
-    /// <param name="hasUnread">Whether there are unread messages from this recipient</param>
+    ///     For group chats: list of member NanoChat numbers.
-    public NanoChatRecipient(uint number, string name, string? jobTitle = null, bool hasUnread = false)
+    /// </summary>
+    public HashSet<uint>? Members = members;
+
+    /// <summary>
+    ///     For group chats: the NanoChat number of the creator.
+    /// </summary>
+    public uint? CreatorId = creatorId;
+
+    /// <summary>
+    ///     For group chats: set of admin NanoChat numbers who can invite/kick.
+    /// </summary>
+    public HashSet<uint>? Admins = admins;
+
+    readonly int IComparable<NanoChatRecipient>.CompareTo(NanoChatRecipient other)
     {
-        Number = number;
+        // Groups should go before normal users
-        Name = name;
+        if (IsGroup && !other.IsGroup)
-        JobTitle = jobTitle;
+            return -1;
-        HasUnread = hasUnread;
+        else if (!IsGroup && other.IsGroup)
+            return 1;
+
+        // FIXME: Order by Department?
+
+        // Order by name
+        var nameCompare = string.CompareOrdinal(Name, other.Name);
+        if (nameCompare != 0)
+            return nameCompare;
+
+        // Smaller number goes first
+        if (Number > other.Number)
+            return 1;
+        else if (Number < other.Number)
+            return -1;
+        else
+            return 0;
     }
 }
 

Content.Shared/_DV/NanoChat/SharedNanoChatSystem.cs

@@ -1,5 +1,7 @@
 using Content.Shared._DV.CartridgeLoader.Cartridges;
+using Content.Shared._Funkystation.NanoChat;
 using Content.Shared.Examine;
+using Robust.Shared.Prototypes;
 using Robust.Shared.Timing;
 
 namespace Content.Shared._DV.NanoChat;
@@ -10,11 +12,13 @@ namespace Content.Shared._DV.NanoChat;
 public abstract class SharedNanoChatSystem : EntitySystem
 {
     [Dependency] private readonly IGameTiming _timing = default!;
+    [Dependency] private readonly IPrototypeManager _prototypeManager = default!;
 
     public override void Initialize()
     {
         base.Initialize();
         SubscribeLocalEvent<NanoChatCardComponent, ExaminedEvent>(OnExamined);
+        _prototypeManager.PrototypesReloaded += (_) => NanoChatEmojis.ClearCache();
     }
 
     private void OnExamined(Entity<NanoChatCardComponent> ent, ref ExaminedEvent args)
@@ -36,6 +40,9 @@ public abstract class SharedNanoChatSystem : EntitySystem
     /// </summary>
     public static string Truncate(string text, int maxLength, string overflowText = "...")
     {
+        if (string.IsNullOrEmpty(text))
+            return string.Empty;
+
         return text.Length > maxLength
             ? text[..(maxLength - overflowText.Length)] + overflowText
             : text;

Content.Shared/_Funkystation/NanoChat/NanoChatEmojiPrototype.cs

@@ -0,0 +1,34 @@
+// SPDX-FileCopyrightText: 2025 Evaisa <evagiacosa1@gmail.com>
+// SPDX-FileCopyrightText: 2025 EvaisaDev <mail@evaisa.dev>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later AND MIT
+
+using Robust.Shared.Prototypes;
+using Robust.Shared.Utility;
+
+namespace Content.Shared._Funkystation.NanoChat;
+
+/// <summary>
+/// Prototype for NanoChat emoji definitions.
+/// </summary>
+[Prototype]
+public sealed partial class NanoChatEmojiPrototype : IPrototype
+{
+    /// <summary>
+    /// The unique identifier for this emoji (e.g., "godo")
+    /// </summary>
+    [IdDataField]
+    public string ID { get; private set; } = string.Empty;
+
+    /// <summary>
+    /// Optional category for grouping emojis (e.g., "Godo", "Plushies")
+    /// </summary>
+    [DataField]
+    public string Category { get; private set; } = string.Empty;
+
+    /// <summary>
+    /// The sprite specifier for this emoji
+    /// </summary>
+    [DataField(required: true)]
+    public SpriteSpecifier Sprite = default!;
+}

Content.Shared/_Funkystation/NanoChat/NanoChatEmojis.cs

@@ -0,0 +1,53 @@
+// SPDX-FileCopyrightText: 2025 Evaisa <evagiacosa1@gmail.com>
+// SPDX-FileCopyrightText: 2025 EvaisaDev <mail@evaisa.dev>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later AND MIT
+
+using System.Linq;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Utility;
+
+namespace Content.Shared._Funkystation.NanoChat;
+
+/// <summary>
+/// Shared emoji definitions for NanoChat.
+/// This class provides access to emoji prototypes.
+/// </summary>
+public static class NanoChatEmojis
+{
+    private static Dictionary<string, SpriteSpecifier>? _cachedEmojis;
+
+    /// <summary>
+    /// Dictionary mapping emoji names to their sprite specifiers.
+    /// </summary>
+    public static IReadOnlyDictionary<string, SpriteSpecifier> EmojiSpecifiers
+    {
+        get
+        {
+            if (_cachedEmojis == null)
+            {
+                var prototypeManager = IoCManager.Resolve<IPrototypeManager>();
+                _cachedEmojis = new Dictionary<string, SpriteSpecifier>();
+
+                var sortedEmojis = prototypeManager.EnumeratePrototypes<NanoChatEmojiPrototype>()
+                    .OrderBy(proto => proto.Category)
+                    .ThenBy(proto => proto.ID);
+
+                foreach (var proto in sortedEmojis)
+                {
+                    _cachedEmojis[proto.ID] = proto.Sprite;
+                }
+            }
+
+            return _cachedEmojis;
+        }
+    }
+
+    /// <summary>
+    /// Clears the emoji cache. Call this if prototypes are reloaded.
+    /// </summary>
+    public static void ClearCache()
+    {
+        _cachedEmojis = null;
+    }
+}

Resources/Locale/en-US/_DV/cartridge-loader/cartridges.ftl

@@ -188,6 +188,7 @@ nano-chat-title = NanoChat
 nano-chat-new-chat = New Chat
 nano-chat-contacts = CONTACTS
 nano-chat-no-chats = No active chats
+nano-chat-no-id-card = No ID card inserted
 nano-chat-select-chat = Select a chat to begin
 nano-chat-message-placeholder = Type a message...
 nano-chat-send = Send

Resources/Locale/en-US/_Funkystation/nanochat/nanochat.ftl

@@ -0,0 +1,39 @@
+# SPDX-FileCopyrightText: 2025 EvaisaDev <mail@evaisa.dev>
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later AND MIT
+
+# Group chat
+nano-chat-create-group = Create Group Chat
+nano-chat-invite-to-group = Invite to Group
+nano-chat-view-members = View Members
+nano-chat-invite = Invite
+nano-chat-kick = Kick
+nano-chat-leave = Leave
+nano-chat-admin = Make Admin
+nano-chat-deadmin = Remove Admin
+nano-chat-no-results = No results found
+nano-chat-no-members = No members
+nano-chat-close = Close
+
+# Create group chat popup
+nano-chat-create-group-title = Create Group Chat
+nano-chat-group-name-label = Group Name
+nano-chat-group-name-placeholder = Enter a group name
+
+# Invite to group popup
+nano-chat-invite-to-group-title = Invite to Group
+nano-chat-search-label = Search
+nano-chat-search-placeholder = Search by name or number...
+
+# Group members popup
+nano-chat-group-members-title = Group Members
+nano-chat-owner-suffix = (Owner)
+nano-chat-admin-suffix = (Admin)
+
+# Emoji picker
+nano-chat-emoji-picker = Emoji Picker
+nano-chat-emoji-search = Search emojis...
+
+# Department sorting
+nano-chat-other-department = Other
+nano-chat-unknown-sender = Unknown

Resources/Prototypes/_Funkystation/NanoChat/emojis.yml

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+# SPDX-FileCopyrightText: 2025 Evaisa <evagiacosa1@gmail.com>
+# SPDX-FileCopyrightText: 2025 EvaisaDev <mail@evaisa.dev>
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later AND MIT
+
+# Godo emotes
+- type: nanoChatEmoji
+  id: godo
+  category: Godo
+  sprite: /Textures/_Funkystation/Interface/NanoChat/Emotes/godo.png
+
+- type: nanoChatEmoji
+  id: do
+  category: Godo
+  sprite: /Textures/_Funkystation/Interface/NanoChat/Emotes/do.png
+
+- type: nanoChatEmoji
+  id: donow
+  category: Godo
+  sprite: /Textures/_Funkystation/Interface/NanoChat/Emotes/donow.png
+
+- type: nanoChatEmoji
+  id: gocrazy
+  category: Godo
+  sprite: /Textures/_Funkystation/Interface/NanoChat/Emotes/donot.png
+
+- type: nanoChatEmoji
+  id: gosad
+  category: Godo
+  sprite: /Textures/_Funkystation/Interface/NanoChat/Emotes/dontdo.png
+
+- type: nanoChatEmoji
+  id: godover
+  category: Godo
+  sprite: /Textures/_Funkystation/Interface/NanoChat/Emotes/godover.png
+
+- type: nanoChatEmoji
+  id: golove
+  category: Godo
+  sprite: /Textures/_Funkystation/Interface/NanoChat/Emotes/golove.png
+
+# Character emotes
+- type: nanoChatEmoji
+  id: buzz
+  category: Character
+  sprite: /Textures/Interface/Emotes/buzztwo.png
+
+- type: nanoChatEmoji
+  id: chime
+  category: Character
+  sprite: /Textures/_Funkystation/Interface/NanoChat/Emotes/chime.png
+
+- type: nanoChatEmoji
+  id: chirp
+  category: Character
+  sprite: /Textures/_Funkystation/Interface/NanoChat/Emotes/chirp.png
+
+- type: nanoChatEmoji
+  id: clap
+  category: Character
+  sprite: /Textures/_Funkystation/Interface/NanoChat/Emotes/clap.png
+
+- type: nanoChatEmoji
+  id: click
+  category: Character
+  sprite: /Textures/_Funkystation/Interface/NanoChat/Emotes/click.png
+
+- type: nanoChatEmoji
+  id: cough
+  category: Character
+  sprite: /Textures/Interface/Emotes/cough.png
+
+- type: nanoChatEmoji
+  id: cry
+  category: Character
+  sprite: /Textures/Interface/Emotes/cry.png
+
+- type: nanoChatEmoji
+  id: deathgasp
+  category: Character
+  sprite: /Textures/Interface/Emotes/deathgasp.png
+
+- type: nanoChatEmoji
+  id: hew
+  category: Character
+  sprite: /Textures/Interface/Emotes/hew.png
+
+- type: nanoChatEmoji
+  id: honk
+  category: Character
+  sprite: /Textures/_Funkystation/Interface/NanoChat/Emotes/honk.png
+
+- type: nanoChatEmoji
+  id: laugh
+  category: Character
+  sprite: /Textures/Interface/Emotes/laugh.png
+
+- type: nanoChatEmoji
+  id: salute
+  category: Character
+  sprite: /Textures/Interface/Emotes/salute.png
+
+- type: nanoChatEmoji
+  id: scream
+  category: Character
+  sprite: /Textures/Interface/Actions/scream.png
+
+- type: nanoChatEmoji
+  id: sigh
+  category: Character
+  sprite: /Textures/Interface/Emotes/sigh.png
+
+- type: nanoChatEmoji
+  id: snap
+  category: Character
+  sprite: /Textures/Interface/Emotes/snap.png
+
+- type: nanoChatEmoji
+  id: squeak
+  category: Character
+  sprite: /Textures/_Funkystation/Interface/NanoChat/Emotes/squeak.png
+
+- type: nanoChatEmoji
+  id: tailslap
+  category: Character
+  sprite: /Textures/Interface/Emotes/tailslap.png
+
+- type: nanoChatEmoji
+  id: vocal
+  category: Character
+  sprite: /Textures/Interface/Emotes/vocal.png
+
+- type: nanoChatEmoji
+  id: weh
+  category: Character
+  sprite: /Textures/Interface/Emotes/weh.png
+
+- type: nanoChatEmoji
+  id: whistle
+  category: Character
+  sprite: /Textures/Interface/Emotes/whistle.png
+
+- type: nanoChatEmoji
+  id: yawn
+  category: Character
+  sprite: /Textures/Interface/Emotes/yawn.png
+
+# Plushie emotes
+- type: nanoChatEmoji
+  id: bee
+  category: Plushies
+  sprite:
+    sprite: /Textures/Objects/Fun/Plushies/bee.rsi
+    state: icon
+
+- type: nanoChatEmoji
+  id: ratvar
+  category: Plushies
+  sprite:
+    sprite: /Textures/Objects/Fun/Plushies/ratvar.rsi
+    state: icon
+
+- type: nanoChatEmoji
+  id: penguin
+  category: Plushies
+  sprite:
+    sprite: /Textures/Objects/Fun/Plushies/penguin.rsi
+    state: icon
+
+- type: nanoChatEmoji
+  id: moth
+  category: Plushies
+  sprite:
+    sprite: /Textures/Objects/Fun/Plushies/moth.rsi
+    state: icon
+
+- type: nanoChatEmoji
+  id: rouny
+  category: Plushies
+  sprite: /Textures/_Funkystation/Interface/NanoChat/Emotes/rouny.png
+
+- type: nanoChatEmoji
+  id: lizard
+  category: Plushies
+  sprite:
+    sprite: /Textures/Objects/Fun/Plushies/lizard.rsi
+    state: icon
+
+- type: nanoChatEmoji
+  id: spacelizard
+  category: Plushies
+  sprite:
+    sprite: /Textures/Objects/Fun/Plushies/lizard.rsi
+    state: plushie_spacelizard
+
+- type: nanoChatEmoji
+  id: hampter
+  category: Plushies
+  sprite:
+    sprite: /Textures/Objects/Fun/Plushies/hampter.rsi
+    state: icon
+
+- type: nanoChatEmoji
+  id: arachnid
+  category: Plushies
+  sprite:
+    sprite: /Textures/Objects/Fun/Plushies/arachnid.rsi
+    state: icon
+
+- type: nanoChatEmoji
+  id: lamp
+  category: Plushies
+  sprite:
+    sprite: /Textures/Objects/Fun/Plushies/lamp.rsi
+    state: icon
+
+- type: nanoChatEmoji
+  id: nukie
+  category: Plushies
+  sprite:
+    sprite: /Textures/Objects/Fun/Plushies/nukie.rsi
+    state: icon
+
+- type: nanoChatEmoji
+  id: atmosian
+  category: Plushies
+  sprite:
+    sprite: /Textures/Objects/Fun/Plushies/atmosian.rsi
+    state: icon
+
+- type: nanoChatEmoji
+  id: slime
+  category: Plushies
+  sprite:
+    sprite: /Textures/Objects/Fun/Plushies/slime.rsi
+    state: icon
+
+- type: nanoChatEmoji
+  id: snake
+  category: Plushies
+  sprite:
+    sprite: /Textures/Objects/Fun/Plushies/snake.rsi
+    state: icon
+
+- type: nanoChatEmoji
+  id: vox
+  category: Plushies
+  sprite:
+    sprite: /Textures/Objects/Fun/Plushies/vox.rsi
+    state: icon
+
+- type: nanoChatEmoji
+  id: diona
+  category: Plushies
+  sprite: /Textures/_Funkystation/Interface/NanoChat/Emotes/plushie_diona.png
+
+- type: nanoChatEmoji
+  id: human
+  category: Plushies
+  sprite:
+    sprite: /Textures/Objects/Fun/Plushies/human.rsi
+    state: icon
+
+- type: nanoChatEmoji
+  id: xeno
+  category: Plushies
+  sprite:
+    sprite: /Textures/Objects/Fun/Plushies/xeno.rsi
+    state: icon
+
+- type: nanoChatEmoji
+  id: carp
+  category: Plushies
+  sprite:
+    sprite: /Textures/Objects/Fun/Plushies/carp.rsi
+    state: carpplush
+
+- type: nanoChatEmoji
+  id: rainbowcarp
+  category: Plushies
+  sprite: /Textures/_Funkystation/Interface/NanoChat/Emotes/rainbowcarp.png
+
+- type: nanoChatEmoji
+  id: rainbowlizard
+  category: Plushies
+  sprite: /Textures/_Funkystation/Interface/NanoChat/Emotes/rainbowlizardplush.png
+
+- type: nanoChatEmoji
+  id: nar
+  category: Plushies
+  sprite:
+    sprite: /Textures/Objects/Fun/Plushies/narsie.rsi
+    state: icon
+
+- type: nanoChatEmoji
+  id: mothroach
+  category: Plushies
+  sprite:
+    sprite: /Textures/_Funkystation/Objects/Fun/toys.rsi
+    state: plushie_mothroach
+
+- type: nanoChatEmoji
+  id: cosmic
+  category: Plushies
+  sprite:
+    sprite: /Textures/_DV/CosmicCult/Objects/unknownplushie.rsi
+    state: plushie_cosmic
+
+# Other
+- type: nanoChatEmoji
+  id: floorgoblin
+  category: Misc
+  sprite: /Textures/_Funkystation/Interface/NanoChat/Emotes/floorgoblin.png

Resources/Textures/_Funkystation/Objects/Fun/toys.rsi/meta.json

@@ -0,0 +1,14 @@
+{
+    "version": 1,
+    "license": "CC-BY-SA-3.0",
+    "copyright": "meijunkie on Discord - https://funkystation.org",
+    "size": {
+        "x": 32,
+        "y": 32
+    },
+    "states": [
+        {
+            "name": "plushie_mothroach"
+        }
+    ]
+}