11 files changed, 81 insertions, 19 deletions

diff --git a/src/yuzu/main.cpp b/src/yuzu/main.cpp
index e103df977..a85adc072 100644
--- a/src/yuzu/main.cpp
+++ b/src/yuzu/main.cpp
@@ -860,7 +860,7 @@ void GMainWindow::InitializeWidgets() {
     });
 
     multiplayer_state = new MultiplayerState(this, game_list->GetModel(), ui->action_Leave_Room,
-                                             ui->action_Show_Room, system->GetRoomNetwork());
+                                             ui->action_Show_Room, *system);
     multiplayer_state->setVisible(false);
 
     // Create status bar
diff --git a/src/yuzu/multiplayer/direct_connect.cpp b/src/yuzu/multiplayer/direct_connect.cpp
index 4c0ea0a6b..65b5f0b9d 100644
--- a/src/yuzu/multiplayer/direct_connect.cpp
+++ b/src/yuzu/multiplayer/direct_connect.cpp
@@ -8,6 +8,7 @@
 #include <QString>
 #include <QtConcurrent/QtConcurrentRun>
 #include "common/settings.h"
+#include "core/internal_network/network_interface.h"
 #include "network/network.h"
 #include "ui_direct_connect.h"
 #include "yuzu/main.h"
@@ -20,9 +21,10 @@
 
 enum class ConnectionType : u8 { TraversalServer, IP };
 
-DirectConnectWindow::DirectConnectWindow(Network::RoomNetwork& room_network_, QWidget* parent)
+DirectConnectWindow::DirectConnectWindow(Core::System& system_, QWidget* parent)
     : QDialog(parent, Qt::WindowTitleHint | Qt::WindowCloseButtonHint | Qt::WindowSystemMenuHint),
-      ui(std::make_unique<Ui::DirectConnect>()), room_network{room_network_} {
+      ui(std::make_unique<Ui::DirectConnect>()), system{system_}, room_network{
+                                                                      system.GetRoomNetwork()} {
 
     ui->setupUi(this);
 
@@ -53,10 +55,20 @@ void DirectConnectWindow::RetranslateUi() {
 }
 
 void DirectConnectWindow::Connect() {
+    if (!Network::GetSelectedNetworkInterface()) {
+        NetworkMessage::ErrorManager::ShowError(
+            NetworkMessage::ErrorManager::NO_INTERFACE_SELECTED);
+        return;
+    }
     if (!ui->nickname->hasAcceptableInput()) {
         NetworkMessage::ErrorManager::ShowError(NetworkMessage::ErrorManager::USERNAME_NOT_VALID);
         return;
     }
+    if (system.IsPoweredOn()) {
+        if (!NetworkMessage::WarnGameRunning()) {
+            return;
+        }
+    }
     if (const auto member = room_network.GetRoomMember().lock()) {
         // Prevent the user from trying to join a room while they are already joining.
         if (member->GetState() == Network::RoomMember::State::Joining) {
diff --git a/src/yuzu/multiplayer/direct_connect.h b/src/yuzu/multiplayer/direct_connect.h
index 4e1043053..defa4f4ec 100644
--- a/src/yuzu/multiplayer/direct_connect.h
+++ b/src/yuzu/multiplayer/direct_connect.h
@@ -6,6 +6,7 @@
 #include <memory>
 #include <QDialog>
 #include <QFutureWatcher>
+#include "core/core.h"
 #include "yuzu/multiplayer/validation.h"
 
 namespace Ui {
@@ -16,7 +17,7 @@ class DirectConnectWindow : public QDialog {
     Q_OBJECT
 
 public:
-    explicit DirectConnectWindow(Network::RoomNetwork& room_network_, QWidget* parent = nullptr);
+    explicit DirectConnectWindow(Core::System& system_, QWidget* parent = nullptr);
     ~DirectConnectWindow();
 
     void RetranslateUi();
@@ -39,5 +40,6 @@ private:
     QFutureWatcher<void>* watcher;
     std::unique_ptr<Ui::DirectConnect> ui;
     Validation validation;
+    Core::System& system;
     Network::RoomNetwork& room_network;
 };
diff --git a/src/yuzu/multiplayer/host_room.cpp b/src/yuzu/multiplayer/host_room.cpp
index 8e7a81291..ad7dcc36d 100644
--- a/src/yuzu/multiplayer/host_room.cpp
+++ b/src/yuzu/multiplayer/host_room.cpp
@@ -12,6 +12,7 @@
 #include <QtConcurrent/QtConcurrentRun>
 #include "common/logging/log.h"
 #include "common/settings.h"
+#include "core/internal_network/network_interface.h"
 #include "network/announce_multiplayer_session.h"
 #include "ui_host_room.h"
 #include "yuzu/game_list_p.h"
@@ -27,10 +28,11 @@
 
 HostRoomWindow::HostRoomWindow(QWidget* parent, QStandardItemModel* list,
                                std::shared_ptr<Core::AnnounceMultiplayerSession> session,
-                               Network::RoomNetwork& room_network_)
+                               Core::System& system_)
     : QDialog(parent, Qt::WindowTitleHint | Qt::WindowCloseButtonHint | Qt::WindowSystemMenuHint),
       ui(std::make_unique<Ui::HostRoom>()),
-      announce_multiplayer_session(session), room_network{room_network_} {
+      announce_multiplayer_session(session), system{system_}, room_network{
+                                                                  system.GetRoomNetwork()} {
     ui->setupUi(this);
 
     // set up validation for all of the fields
@@ -105,6 +107,11 @@ std::unique_ptr<Network::VerifyUser::Backend> HostRoomWindow::CreateVerifyBacken
 }
 
 void HostRoomWindow::Host() {
+    if (!Network::GetSelectedNetworkInterface()) {
+        NetworkMessage::ErrorManager::ShowError(
+            NetworkMessage::ErrorManager::NO_INTERFACE_SELECTED);
+        return;
+    }
     if (!ui->username->hasAcceptableInput()) {
         NetworkMessage::ErrorManager::ShowError(NetworkMessage::ErrorManager::USERNAME_NOT_VALID);
         return;
@@ -121,6 +128,11 @@ void HostRoomWindow::Host() {
         NetworkMessage::ErrorManager::ShowError(NetworkMessage::ErrorManager::GAME_NOT_SELECTED);
         return;
     }
+    if (system.IsPoweredOn()) {
+        if (!NetworkMessage::WarnGameRunning()) {
+            return;
+        }
+    }
     if (auto member = room_network.GetRoomMember().lock()) {
         if (member->GetState() == Network::RoomMember::State::Joining) {
             return;
diff --git a/src/yuzu/multiplayer/host_room.h b/src/yuzu/multiplayer/host_room.h
index a968042d0..63c0d2333 100644
--- a/src/yuzu/multiplayer/host_room.h
+++ b/src/yuzu/multiplayer/host_room.h
@@ -8,6 +8,7 @@
 #include <QSortFilterProxyModel>
 #include <QStandardItemModel>
 #include <QVariant>
+#include "core/core.h"
 #include "network/network.h"
 #include "yuzu/multiplayer/chat_room.h"
 #include "yuzu/multiplayer/validation.h"
@@ -35,7 +36,7 @@ class HostRoomWindow : public QDialog {
 public:
     explicit HostRoomWindow(QWidget* parent, QStandardItemModel* list,
                             std::shared_ptr<Core::AnnounceMultiplayerSession> session,
-                            Network::RoomNetwork& room_network_);
+                            Core::System& system_);
     ~HostRoomWindow();
 
     /**
@@ -54,6 +55,7 @@ private:
     QStandardItemModel* game_list;
     ComboBoxProxyModel* proxy;
     Validation validation;
+    Core::System& system;
     Network::RoomNetwork& room_network;
 };
 
diff --git a/src/yuzu/multiplayer/lobby.cpp b/src/yuzu/multiplayer/lobby.cpp
index 1cc518279..c5fb846c7 100644
--- a/src/yuzu/multiplayer/lobby.cpp
+++ b/src/yuzu/multiplayer/lobby.cpp
@@ -6,6 +6,7 @@
 #include <QtConcurrent/QtConcurrentRun>
 #include "common/logging/log.h"
 #include "common/settings.h"
+#include "core/internal_network/network_interface.h"
 #include "network/network.h"
 #include "ui_lobby.h"
 #include "yuzu/game_list_p.h"
@@ -22,11 +23,11 @@
 #endif
 
 Lobby::Lobby(QWidget* parent, QStandardItemModel* list,
-             std::shared_ptr<Core::AnnounceMultiplayerSession> session,
-             Network::RoomNetwork& room_network_)
+             std::shared_ptr<Core::AnnounceMultiplayerSession> session, Core::System& system_)
     : QDialog(parent, Qt::WindowTitleHint | Qt::WindowCloseButtonHint | Qt::WindowSystemMenuHint),
       ui(std::make_unique<Ui::Lobby>()),
-      announce_multiplayer_session(session), room_network{room_network_} {
+      announce_multiplayer_session(session), system{system_}, room_network{
+                                                                  system.GetRoomNetwork()} {
     ui->setupUi(this);
 
     // setup the watcher for background connections
@@ -114,6 +115,18 @@ void Lobby::OnExpandRoom(const QModelIndex& index) {
 }
 
 void Lobby::OnJoinRoom(const QModelIndex& source) {
+    if (!Network::GetSelectedNetworkInterface()) {
+        NetworkMessage::ErrorManager::ShowError(
+            NetworkMessage::ErrorManager::NO_INTERFACE_SELECTED);
+        return;
+    }
+
+    if (system.IsPoweredOn()) {
+        if (!NetworkMessage::WarnGameRunning()) {
+            return;
+        }
+    }
+
     if (const auto member = room_network.GetRoomMember().lock()) {
         // Prevent the user from trying to join a room while they are already joining.
         if (member->GetState() == Network::RoomMember::State::Joining) {
diff --git a/src/yuzu/multiplayer/lobby.h b/src/yuzu/multiplayer/lobby.h
index 02cc766e4..49fd4c473 100644
--- a/src/yuzu/multiplayer/lobby.h
+++ b/src/yuzu/multiplayer/lobby.h
@@ -9,6 +9,7 @@
 #include <QSortFilterProxyModel>
 #include <QStandardItemModel>
 #include "common/announce_multiplayer_room.h"
+#include "core/core.h"
 #include "network/announce_multiplayer_session.h"
 #include "network/network.h"
 #include "yuzu/multiplayer/validation.h"
@@ -30,7 +31,7 @@ class Lobby : public QDialog {
 public:
     explicit Lobby(QWidget* parent, QStandardItemModel* list,
                    std::shared_ptr<Core::AnnounceMultiplayerSession> session,
-                   Network::RoomNetwork& room_network_);
+                   Core::System& system_);
     ~Lobby() override;
 
     /**
@@ -94,6 +95,7 @@ private:
     std::weak_ptr<Core::AnnounceMultiplayerSession> announce_multiplayer_session;
     QFutureWatcher<void>* watcher;
     Validation validation;
+    Core::System& system;
     Network::RoomNetwork& room_network;
 };
 
diff --git a/src/yuzu/multiplayer/message.cpp b/src/yuzu/multiplayer/message.cpp
index 94d7a38b8..758b5b731 100644
--- a/src/yuzu/multiplayer/message.cpp
+++ b/src/yuzu/multiplayer/message.cpp
@@ -49,6 +49,9 @@ const ConnectionError ErrorManager::PERMISSION_DENIED(
     QT_TR_NOOP("You do not have enough permission to perform this action."));
 const ConnectionError ErrorManager::NO_SUCH_USER(QT_TR_NOOP(
     "The user you are trying to kick/ban could not be found.\nThey may have left the room."));
+const ConnectionError ErrorManager::NO_INTERFACE_SELECTED(
+    QT_TR_NOOP("No network interface is selected.\nPlease go to Configure -> System -> Network and "
+               "make a selection."));
 
 static bool WarnMessage(const std::string& title, const std::string& text) {
     return QMessageBox::Ok == QMessageBox::warning(nullptr, QObject::tr(title.c_str()),
@@ -60,6 +63,13 @@ void ErrorManager::ShowError(const ConnectionError& e) {
     QMessageBox::critical(nullptr, tr("Error"), tr(e.GetString().c_str()));
 }
 
+bool WarnGameRunning() {
+    return WarnMessage(
+        QT_TR_NOOP("Game already running"),
+        QT_TR_NOOP("Joining a room when the game is already running is discouraged "
+                   "and can cause the room feature not to work correctly.\nProceed anyway?"));
+}
+
 bool WarnCloseRoom() {
     return WarnMessage(
         QT_TR_NOOP("Leave Room"),
diff --git a/src/yuzu/multiplayer/message.h b/src/yuzu/multiplayer/message.h
index 812495c72..f038b9a1f 100644
--- a/src/yuzu/multiplayer/message.h
+++ b/src/yuzu/multiplayer/message.h
@@ -43,11 +43,20 @@ public:
     static const ConnectionError IP_COLLISION;
     static const ConnectionError PERMISSION_DENIED;
     static const ConnectionError NO_SUCH_USER;
+    static const ConnectionError NO_INTERFACE_SELECTED;
     /**
      *  Shows a standard QMessageBox with a error message
      */
     static void ShowError(const ConnectionError& e);
 };
+
+/**
+ * Show a standard QMessageBox with a warning message about joining a room when
+ * the game is already running
+ * return true if the user wants to close the network connection
+ */
+bool WarnGameRunning();
+
 /**
  * Show a standard QMessageBox with a warning message about leaving the room
  * return true if the user wants to close the network connection
diff --git a/src/yuzu/multiplayer/state.cpp b/src/yuzu/multiplayer/state.cpp
index dba76b22b..d1a68b182 100644
--- a/src/yuzu/multiplayer/state.cpp
+++ b/src/yuzu/multiplayer/state.cpp
@@ -19,10 +19,9 @@
 #include "yuzu/util/clickable_label.h"
 
 MultiplayerState::MultiplayerState(QWidget* parent, QStandardItemModel* game_list_model_,
-                                   QAction* leave_room_, QAction* show_room_,
-                                   Network::RoomNetwork& room_network_)
+                                   QAction* leave_room_, QAction* show_room_, Core::System& system_)
     : QWidget(parent), game_list_model(game_list_model_), leave_room(leave_room_),
-      show_room(show_room_), room_network{room_network_} {
+      show_room(show_room_), system{system_}, room_network{system.GetRoomNetwork()} {
     if (auto member = room_network.GetRoomMember().lock()) {
         // register the network structs to use in slots and signals
         state_callback_handle = member->BindOnStateChanged(
@@ -208,15 +207,14 @@ static void BringWidgetToFront(QWidget* widget) {
 
 void MultiplayerState::OnViewLobby() {
     if (lobby == nullptr) {
-        lobby = new Lobby(this, game_list_model, announce_multiplayer_session, room_network);
+        lobby = new Lobby(this, game_list_model, announce_multiplayer_session, system);
     }
     BringWidgetToFront(lobby);
 }
 
 void MultiplayerState::OnCreateRoom() {
     if (host_room == nullptr) {
-        host_room =
-            new HostRoomWindow(this, game_list_model, announce_multiplayer_session, room_network);
+        host_room = new HostRoomWindow(this, game_list_model, announce_multiplayer_session, system);
     }
     BringWidgetToFront(host_room);
 }
@@ -279,7 +277,7 @@ void MultiplayerState::OnOpenNetworkRoom() {
 
 void MultiplayerState::OnDirectConnectToRoom() {
     if (direct_connect == nullptr) {
-        direct_connect = new DirectConnectWindow(room_network, this);
+        direct_connect = new DirectConnectWindow(system, this);
     }
     BringWidgetToFront(direct_connect);
 }
diff --git a/src/yuzu/multiplayer/state.h b/src/yuzu/multiplayer/state.h
index 23960414e..3921f2fc3 100644
--- a/src/yuzu/multiplayer/state.h
+++ b/src/yuzu/multiplayer/state.h
@@ -4,6 +4,7 @@
 #pragma once
 
 #include <QWidget>
+#include "core/core.h"
 #include "network/announce_multiplayer_session.h"
 #include "network/network.h"
 
@@ -19,7 +20,7 @@ class MultiplayerState : public QWidget {
 
 public:
     explicit MultiplayerState(QWidget* parent, QStandardItemModel* game_list, QAction* leave_room,
-                              QAction* show_room, Network::RoomNetwork& room_network_);
+                              QAction* show_room, Core::System& system_);
     ~MultiplayerState();
 
     /**
@@ -86,6 +87,7 @@ private:
     Network::RoomMember::CallbackHandle<Network::RoomMember::Error> error_callback_handle;
 
     bool show_notification = false;
+    Core::System& system;
     Network::RoomNetwork& room_network;
 };