src/main/java/ch/unibas/dmi/dbis/cs108/casono/client/ClientApp.java

@@ -42,7 +42,7 @@ public class ClientApp {
         System.setProperty("casono.server.host", host);
         System.setProperty("casono.server.port", Integer.toString(port));
         // Forward the original address argument to the launcher as well.
-        Launcher.main(new String[] { arg });
+        Launcher.main(new String[] {arg});
     }
 
     public static void main(String[] args) {

src/main/java/ch/unibas/dmi/dbis/cs108/casono/client/chat/Message.java

@@ -20,25 +20,35 @@ public class Message {
 
     /**
      * Constructs a Message with a provided timestamp. Typically used when reconstructing messages
-     * received from the server.
+     * received from the server. Used for Messages in the Lobby Chat.
      *
-     * @param type The chat category (e.g., GLOBAL, LOBBY, or WHISPER).
      * @param lobbyId The ID of the lobby, or -1 if not applicable.
      * @param sender The username of the message creator.
-     * @param target The username of the recipient (required for whispers, otherwise null).
      * @param timestamp The formatted time string (e.g., "HH:mm").
      * @param message The actual text content of the message.
      */
-    public Message(
-            ChatType type,
-            int lobbyId,
-            String sender,
-            String target,
-            String timestamp,
-            String message) {
-        this.type = type;
+    private Message(int lobbyId, String sender, String timestamp, String message) {
+        this.type = ChatType.LOBBY;
         this.lobbyId = lobbyId;
         this.sender = sender;
+        this.target = null;
+        this.timestamp = timestamp;
+        this.message = message;
+    }
+
+    /**
+     * Constructs a Message with a provided timestamp. Typically used when reconstructing messages
+     * received from the server. Used for Messages in the WHISPER and GLOBAL Chat.
+     *
+     * @param type The chat category (e.g., GLOBAL or WHISPER).
+     * @param sender The username of the message creator.
+     * @param timestamp The formatted time string (e.g., "HH:mm").
+     * @param message The actual text content of the message.
+     */
+    private Message(ChatType type, String sender, String target, String timestamp, String message) {
+        this.type = type;
+        this.lobbyId = -1;
+        this.sender = sender;
         this.target = target;
         this.timestamp = timestamp;
         this.message = message;
@@ -120,23 +130,19 @@ public class Message {
             case GLOBAL ->
                     new Message(
                             ChatType.GLOBAL,
-                            -1,
                             getParString(parameters, "USER"),
                             null,
                             getParString(parameters, "TIME"),
                             getParString(parameters, "TEXT"));
             case LOBBY ->
                     new Message(
-                            ChatType.LOBBY,
                             Integer.parseInt(getParString(parameters, "GAME")),
                             getParString(parameters, "USER"),
-                            null,
                             getParString(parameters, "TIME"),
                             getParString(parameters, "TEXT"));
             case WHISPER ->
                     new Message(
                             ChatType.WHISPER,
-                            Integer.parseInt(getParString(parameters, "GAME", "-1")),
                             getParString(parameters, "USER"),
                             getParString(parameters, "TARGET"),
                             getParString(parameters, "TIME"),

src/main/java/ch/unibas/dmi/dbis/cs108/casono/client/game/Card.java

@@ -1,8 +1,6 @@
 package ch.unibas.dmi.dbis.cs108.casono.client.game;
 
-/**
- * Represents a playing card with a value and suit.
- */
+/** Represents a playing card with a value and suit. */
 public class Card {
     public String value;
     public String suit;

src/main/java/ch/unibas/dmi/dbis/cs108/casono/client/game/GameState.java

@@ -1,15 +1,11 @@
 package ch.unibas.dmi.dbis.cs108.casono.client.game;
 
-import ch.unibas.dmi.dbis.cs108.casono.client.game.Card;
-import ch.unibas.dmi.dbis.cs108.casono.client.game.Player;
-
 import java.util.ArrayList;
 import java.util.List;
 
 /**
- * Represents the current state of the poker game, including the phase, pot
- * size, current bet, dealer position,
- * active player, community cards, and player information.
+ * Represents the current state of the poker game, including the phase, pot size, current bet,
+ * dealer position, active player, community cards, and player information.
  */
 public class GameState {
     public String phase;

src/main/java/ch/unibas/dmi/dbis/cs108/casono/client/game/Player.java

@@ -4,8 +4,8 @@ import java.util.ArrayList;
 import java.util.List;
 
 /**
- * Represents a player in the poker game, including their name, chip count,
- * current bet, state (e.g., "active", "folded"), and their hole cards.
+ * Represents a player in the poker game, including their name, chip count, current bet, state
+ * (e.g., "active", "folded"), and their hole cards.
  */
 public class Player {
     public String name;

src/main/java/ch/unibas/dmi/dbis/cs108/casono/client/network/ClientService.java

@@ -28,10 +28,11 @@ public class ClientService {
     private final Socket socket;
 
     private final ExecutorService executor;
+    private final boolean offlineMode;
 
     public static ArrayList<String> response;
     private final AtomicInteger idGenerator;
-    private final Logger logger;
+    private Logger logger;
 
     /**
      * Constructs a ClientService with the given server IP and port. It establishes a socket
@@ -47,6 +48,8 @@ public class ClientService {
 
         this.logger = LogManager.getLogger(ClientService.class);
 
+        this.offlineMode = false;
+
         try {
             socket = new Socket(ip, port);
             clienttcptransport = new TcpTransport(socket);
@@ -58,6 +61,25 @@ public class ClientService {
         executor = Executors.newSingleThreadExecutor();
     }
 
+    /**
+     * Constructs a ClientService in offline mode. No network connection will be attempted and calls
+     * to processCommand will throw a RuntimeException.
+     *
+     * @param offline true to create an offline (no-network) client service
+     */
+    public ClientService(boolean offline) {
+        this.idGenerator = new AtomicInteger(0);
+        this.offlineMode = offline;
+        this.socket = null;
+        this.clienttcptransport = null;
+        this.executor = Executors.newSingleThreadExecutor();
+    }
+
+    /** Returns true if this ClientService is running in offline mode (no network). */
+    public boolean isOffline() {
+        return offlineMode;
+    }
+
     static Pattern responseRex =
             Pattern.compile(
                     "(?<key>\\w+)=(('(?<string>([^']|\\')+)')|(?<primVal>[+-]?[\\d\\w:]+))");

src/main/java/ch/unibas/dmi/dbis/cs108/casono/client/network/GameClient.java

@@ -3,14 +3,12 @@ package ch.unibas.dmi.dbis.cs108.casono.client.network;
 import ch.unibas.dmi.dbis.cs108.casono.client.game.Card;
 import ch.unibas.dmi.dbis.cs108.casono.client.game.GameState;
 import ch.unibas.dmi.dbis.cs108.casono.client.game.Player;
-
-import java.util.ArrayList;
 import java.util.List;
 
 /**
- * The GameClient class is responsible for communicating with the server to
- * retrieve the current game state. It sends a command to the server and
- * parses the response into a structured GameState object.
+ * The GameClient class is responsible for communicating with the server to retrieve the current
+ * game state. It sends a command to the server and parses the response into a structured GameState
+ * object.
  */
 public class GameClient {
 
@@ -19,21 +17,21 @@ public class GameClient {
     /**
      * Constructs a GameClient with the given ClientService for communication.
      *
-     * @param client The ClientService instance used to send commands and receive
-     *               responses from the server.
+     * @param client The ClientService instance used to send commands and receive responses from the
+     *     server.
      */
     public GameClient(ClientService client) {
         this.client = client;
     }
 
     /**
-     * Retrieves the current game state from the server by sending a command and
-     * parsing the response.
+     * Retrieves the current game state from the server by sending a command and parsing the
+     * response.
      *
      * @return A GameState object representing the current state of the game.
      */
     public GameState getGameState() {
-        String response = client.processCommand("GET_GAME_STATE");
+        List<String> response = client.processCommand("GET_GAME_STATE");
         return parseGameState(response);
     }
 
@@ -43,16 +41,16 @@ public class GameClient {
      * @param input The raw response string from the server.
      * @return A GameState object representing the current state of the game.
      */
-    private GameState parseGameState(String input) {
+    private GameState parseGameState(List<String> input) {
 
         GameState state = new GameState();
 
-        String[] lines = input.split("\n");
+        // String[] lines = input.split("\n");
 
         Player currentPlayer = null;
         Card currentCard = null;
 
-        for (String rawLine : lines) {
+        for (String rawLine : input) {
 
             String line = rawLine.trim();
 
@@ -62,46 +60,26 @@ public class GameClient {
 
             if (line.startsWith("PHASE=")) {
                 state.phase = line.split("=")[1];
-            }
-
-            else if (line.startsWith("POT=")) {
+            } else if (line.startsWith("POT=")) {
                 state.pot = Integer.parseInt(line.split("=")[1]);
-            }
-
-            else if (line.startsWith("CURRENT_BET=")) {
+            } else if (line.startsWith("CURRENT_BET=")) {
                 state.currentBet = Integer.parseInt(line.split("=")[1]);
-            }
-
-            else if (line.startsWith("DEALER=")) {
+            } else if (line.startsWith("DEALER=")) {
                 state.dealer = Integer.parseInt(line.split("=")[1]);
-            }
-
-            else if (line.startsWith("ACTIVE_PLAYER=")) {
+            } else if (line.startsWith("ACTIVE_PLAYER=")) {
                 state.activePlayer = Integer.parseInt(line.split("=")[1]);
-            }
-
-            else if (line.startsWith("PLAYER")) {
+            } else if (line.startsWith("PLAYER")) {
                 currentPlayer = new Player();
                 state.players.add(currentPlayer);
-            }
-
-            else if (line.startsWith("NAME=") && currentPlayer != null) {
+            } else if (line.startsWith("NAME=") && currentPlayer != null) {
                 currentPlayer.name = line.split("=")[1];
-            }
-
-            else if (line.startsWith("CHIPS=") && currentPlayer != null) {
+            } else if (line.startsWith("CHIPS=") && currentPlayer != null) {
                 currentPlayer.chips = Integer.parseInt(line.split("=")[1]);
-            }
-
-            else if (line.startsWith("BET=") && currentPlayer != null) {
+            } else if (line.startsWith("BET=") && currentPlayer != null) {
                 currentPlayer.bet = Integer.parseInt(line.split("=")[1]);
-            }
-
-            else if (line.startsWith("STATE=") && currentPlayer != null) {
+            } else if (line.startsWith("STATE=") && currentPlayer != null) {
                 currentPlayer.state = line.split("=")[1];
-            }
-
-            else if (line.startsWith("CARD")) {
+            } else if (line.startsWith("CARD")) {
                 currentCard = new Card();
 
                 if (currentPlayer != null) {
@@ -109,13 +87,9 @@ public class GameClient {
                 } else {
                     state.communityCards.add(currentCard);
                 }
-            }
-
-            else if (line.startsWith("VALUE=") && currentCard != null) {
+            } else if (line.startsWith("VALUE=") && currentCard != null) {
                 currentCard.value = line.split("=")[1];
-            }
-
-            else if (line.startsWith("SUIT=") && currentCard != null) {
+            } else if (line.startsWith("SUIT=") && currentCard != null) {
                 currentCard.suit = line.split("=")[1];
             }
         }

src/main/java/ch/unibas/dmi/dbis/cs108/casono/client/network/LobbyClient.java

@@ -1,10 +1,9 @@
 package ch.unibas.dmi.dbis.cs108.casono.client.network;
 
 /**
- * The LobbyClient class is responsible for communicating with the server to
- * manage game lobbies. It provides methods to create a lobby, join a lobby,
- * and fetch the current status of a lobby by sending appropriate commands to
- * the server and processing the responses.
+ * The LobbyClient class is responsible for communicating with the server to manage game lobbies. It
+ * provides methods to create a lobby, join a lobby, and fetch the current status of a lobby by
+ * sending appropriate commands to the server and processing the responses.
  */
 public class LobbyClient {
     private final ClientService client;
@@ -12,8 +11,8 @@ public class LobbyClient {
     /**
      * Constructs a LobbyClient with the given ClientService for communication.
      *
-     * @param client The ClientService instance used to send commands and receive
-     *               responses from the server.
+     * @param client The ClientService instance used to send commands and receive responses from the
+     *     server.
      */
     public LobbyClient(ClientService client) {
         this.client = client;
@@ -27,33 +26,29 @@ public class LobbyClient {
      * Fetch the current status of the lobby with the given id from the server.
      *
      * @param lobbyId The id of the lobby to fetch the status for.
-     * @return A string representing the current status of the lobby, as returned
-     *         by the server.
+     * @return A string representing the current status of the lobby, as returned by the server.
      */
     public String fetchLobbyStatusString(int lobbyId) {
-        return client.processCommand("GET_LOBBY_STATUS ID=" + lobbyId);
+        return client.processCommand("GET_LOBBY_STATUS ID=" + lobbyId).getFirst();
     }
 
     /**
-     * Request the server to create a new lobby and return the id of the newly
-     * created lobby.
+     * Request the server to create a new lobby and return the id of the newly created lobby.
      *
      * @return The id of the newly created lobby, as returned by the server.
      */
     public int createLobby() {
-        String response = client.processCommand("CREATE_LOBBY");
+        String response = client.processCommand("CREATE_LOBBY").getFirst();
         return Integer.parseInt(response);
     }
 
     /**
-     * Request the server to return the id of the lobby that the client is
-     * currently in.
+     * Request the server to return the id of the lobby that the client is currently in.
      *
-     * @return The id of the lobby that the client is currently in, as returned by
-     *         the server.
+     * @return The id of the lobby that the client is currently in, as returned by the server.
      */
     public int getLobbyId() {
-        String response = client.processCommand("GET_LOBBY_ID");
+        String response = client.processCommand("GET_LOBBY_ID").getFirst();
         return Integer.parseInt(response);
     }
 

src/main/java/ch/unibas/dmi/dbis/cs108/casono/client/ui/gameui/CasinoGameUI.java

@@ -1,25 +1,12 @@
-
 package ch.unibas.dmi.dbis.cs108.casono.client.ui.gameui;
 
+import ch.unibas.dmi.dbis.cs108.casono.client.network.ClientService;
 import java.io.IOException;
 import javafx.application.Application;
 import javafx.fxml.FXMLLoader;
 import javafx.scene.Scene;
 import javafx.stage.Stage;
 
-/**
- * Main class for the casino game UI.
- *
- * <p>Starts the JavaFX application, loads the graphical interface from the FXML file,
- * and initializes the main stage for the game.
- *
- * <p>Responsibilities:
- * - Loads the FXML interface "/ui-structure/Casinogameui.fxml".
- * - Loads the application icon from "/images/logoinverted.png".
- * - Starts the application in fullscreen mode.
- */
-import ch.unibas.dmi.dbis.cs108.casono.client.network.ClientService;
-
 public class CasinoGameUI extends Application {
 
     // Static field for ClientService (workaround for JavaFX Application launch)
@@ -49,7 +36,8 @@ public class CasinoGameUI extends Application {
      */
     @Override
     public void start(Stage stage) throws IOException {
-        FXMLLoader fxmlLoader = new FXMLLoader(CasinoGameUI.class.getResource("/ui-structure/Casinogameui.fxml"));
+        FXMLLoader fxmlLoader =
+                new FXMLLoader(CasinoGameUI.class.getResource("/ui-structure/Casinogameui.fxml"));
         Scene scene = new Scene(fxmlLoader.load(), DEFAULT_WIDTH, DEFAULT_HEIGHT);
         stage.setTitle("Casono (GAME)");
 

src/main/java/ch/unibas/dmi/dbis/cs108/casono/client/ui/lobbyui/Casinomainui.java

@@ -41,11 +41,13 @@ public class Casinomainui extends Application {
                 System.setProperty("casono.server.port", parts[1]);
             }
         }
-        FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("/ui-structure/Casinomainui.fxml"));
+        FXMLLoader fxmlLoader =
+                new FXMLLoader(getClass().getResource("/ui-structure/Casinomainui.fxml"));
         Scene scene = new Scene(fxmlLoader.load(), SCENE_WIDTH, SCENE_HEIGHT);
         stage.setTitle("Casono");
-        javafx.scene.image.Image icon = new javafx.scene.image.Image(
-                getClass().getResource("/images/logoinverted.png").toExternalForm());
+        javafx.scene.image.Image icon =
+                new javafx.scene.image.Image(
+                        getClass().getResource("/images/logoinverted.png").toExternalForm());
         stage.getIcons().add(icon);
         stage.setScene(scene);
         stage.setFullScreen(true);

src/main/java/ch/unibas/dmi/dbis/cs108/casono/client/ui/lobbyui/CasinomainuiController.java

@@ -1,12 +1,14 @@
 package ch.unibas.dmi.dbis.cs108.casono.client.ui.lobbyui;
 
+import ch.unibas.dmi.dbis.cs108.casono.client.network.ClientService;
+import ch.unibas.dmi.dbis.cs108.casono.client.network.LobbyClient;
 import javafx.application.Platform;
 import javafx.fxml.FXML;
-import javafx.scene.control.Button;
-import javafx.scene.control.TextField;
 import javafx.scene.control.Alert;
 import javafx.scene.control.Alert.AlertType;
+import javafx.scene.control.Button;
 import javafx.scene.control.Label;
+import javafx.scene.control.TextField;
 import javafx.scene.image.Image;
 import javafx.scene.image.ImageView;
 import javafx.scene.layout.AnchorPane;
@@ -14,34 +16,20 @@ import javafx.scene.layout.VBox;
 import javafx.scene.shape.Rectangle;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
-import ch.unibas.dmi.dbis.cs108.casono.client.network.ClientService;
-import ch.unibas.dmi.dbis.cs108.casono.client.network.LobbyClient;
 
-/**
- * Controller for the Casono main UI lobby. Handles UI initialization and user
- * actions.
- */
+/** Controller for the Casono main UI lobby. Handles UI initialization and user actions. */
 public class CasinomainuiController {
     private static final Logger LOGGER = LogManager.getLogger(CasinomainuiController.class);
 
-    @FXML
-    private AnchorPane rootPane;
-    @FXML
-    private Label titleLabel;
-    @FXML
-    private Label subtitleLabel;
-    @FXML
-    private ImageView logoView;
-    @FXML
-    private Rectangle greenBox;
-    @FXML
-    private Button exitbutton;
-    @FXML
-    private VBox casinoTable;
-    @FXML
-    private TextField usernameField;
-    @FXML
-    private Button loginButton;
+    @FXML private AnchorPane rootPane;
+    @FXML private Label titleLabel;
+    @FXML private Label subtitleLabel;
+    @FXML private ImageView logoView;
+    @FXML private Rectangle greenBox;
+    @FXML private Button exitbutton;
+    @FXML private VBox casinoTable;
+    @FXML private TextField usernameField;
+    @FXML private Button loginButton;
 
     private LobbyButtonTranslationManager translationManager;
     private LobbyButtonGridManager gridManager;
@@ -67,10 +55,16 @@ public class CasinomainuiController {
         try {
             clientService = new ClientService(host, port);
         } catch (RuntimeException e) {
-            LOGGER.warn("Could not connect to server {}:{} — starting in offline mode: {}", host, port, e.getMessage());
+            LOGGER.warn(
+                    "Could not connect to server {}:{} — starting in offline mode: {}",
+                    host,
+                    port,
+                    e.getMessage());
             clientService = new ClientService(true); // offline mode
         }
-        gridManager = new LobbyButtonGridManager(new javafx.scene.layout.GridPane(), translationManager, clientService);
+        gridManager =
+                new LobbyButtonGridManager(
+                        new javafx.scene.layout.GridPane(), translationManager, clientService);
         // LobbyClient will use the provided ClientService; in offline mode calls will
         // fail with RuntimeException
         lobbyClient = new LobbyClient(clientService);
@@ -79,10 +73,7 @@ public class CasinomainuiController {
         gridManager.renderLobbyButtons();
     }
 
-    /**
-     * Handles the login button action. Validates input and calls
-     * LobbyClient.login().
-     */
+    /** Handles the login button action. Validates input and calls LobbyClient.login(). */
     @FXML
     public void handleLoginButton() {
         String username = usernameField.getText();
@@ -108,9 +99,7 @@ public class CasinomainuiController {
         }
     }
 
-    /**
-     * Shows an alert dialog with the given message.
-     */
+    /** Shows an alert dialog with the given message. */
     private void showAlert(String message) {
         Alert alert = new Alert(AlertType.INFORMATION);
         alert.setTitle("Info");

src/main/java/ch/unibas/dmi/dbis/cs108/casono/client/ui/lobbyui/LobbyButtonGridManager.java

@@ -1,21 +1,17 @@
 package ch.unibas.dmi.dbis.cs108.casono.client.ui.lobbyui;
 
-/**
- * Manages the grid for lobby buttons and rendering. Uses LobbyButtonTranslationManager for mapping
- * ButtonID to LobbyID.
- */
-import java.util.Map;
+import ch.unibas.dmi.dbis.cs108.casono.client.network.ClientService;
+import ch.unibas.dmi.dbis.cs108.casono.client.network.LobbyClient;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
-import java.util.concurrent.ConcurrentHashMap;
+import java.util.Map;
 import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.TimeUnit;
-import ch.unibas.dmi.dbis.cs108.casono.client.network.LobbyClient;
-import ch.unibas.dmi.dbis.cs108.casono.client.network.ClientService;
 import javafx.scene.Node;
 import javafx.scene.control.Button;
 import javafx.scene.image.Image;
@@ -24,212 +20,187 @@ import javafx.scene.layout.GridPane;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
-/**
- * Manages the grid for lobby buttons and rendering. Uses
- * LobbyButtonTranslationManager for mapping
- * ButtonID to LobbyID.
- */
 public class LobbyButtonGridManager {
-    private static final double BUTTON_WIDTH_MARGIN = 20.0;
+
+    private static final double BTN_WIDTH_MRG = 20.0;
     private static final double BUTTON_MIN_SIZE = 10.0;
-    private static final Logger LOGGER = LogManager.getLogger(LobbyButtonGridManager.class);
-
-    /** GridPane for the button grid. */
-    private final GridPane gridPane;
-
-    /** Manager for mapping ButtonID to LobbyID. */
-    private final LobbyButtonTranslationManager translationManager;
-
-    /** Number of columns in the grid. */
+    private static final int REFRESH_INTERVAL_SECONDS = 5;
+    private static final int INITIAL_DELAY_SECONDS = 5;
     private static final int COLS = 4;
 
-    /** Image for a lobby in CREATED state. */
-    /** Default fallback image. */
+    private static final Logger LOGGER = LogManager.getLogger(LobbyButtonGridManager.class);
+
     private static final String BUTTON_FALLBACK_IMAGE = "/images/lobbypictures/error.png";
 
-    /**
-     * Template for per-button images. Use: button index and status
-     * (created|running). Example:
-     * /images/lobby_1_created.png
-     */
     private static final String BUTTON_IMAGE_TEMPLATE = "/images/lobbypictures/lobby_%d_%s.png";
 
-    /** Cache for loaded Images keyed by resource path. */
-    private final ConcurrentHashMap<String, Image> imageCache = new ConcurrentHashMap<>();
-
+    private final GridPane gridPane;
+    private final LobbyButtonTranslationManager translationManager;
     private final LobbyClient lobbyClient;
 
-    /** Executor for background status/network tasks. */
+    private final ConcurrentHashMap<String, Image> imageCache = new ConcurrentHashMap<>();
+
     private final ExecutorService executor = Executors.newCachedThreadPool();
-    /** Scheduler for periodic refresh of lobby mappings. */
+
     private final ScheduledExecutorService scheduler = Executors.newSingleThreadScheduledExecutor();
 
-    /**
-     * Constructor for the GridManager.
-     *
-     * @param gridPane           the GridPane for rendering
-     * @param translationManager the manager for mapping ButtonID to LobbyID
-     */
     public LobbyButtonGridManager(
-            GridPane gridPane, LobbyButtonTranslationManager translationManager, LobbyClient lobbyClient) {
+            GridPane gridPane,
+            LobbyButtonTranslationManager translationManager,
+            LobbyClient lobbyClient) {
+
         this.gridPane = gridPane;
-        // Always use the singleton
         this.translationManager = LobbyButtonTranslationManager.getInstance();
         this.lobbyClient = lobbyClient;
-        // Start periodic refresh to keep mapping in sync with server
-        startPeriodicRefresh(5, 5);
+
+        startPeriodicRefresh(REFRESH_INTERVAL_SECONDS, INITIAL_DELAY_SECONDS);
     }
 
-    /**
-     * Convenience constructor: accept a {@link ClientService} and build a
-     * {@link LobbyClient} from it. This avoids any host/port System.getProperty
-     * lookups elsewhere — caller controls the ClientService.
-     */
     public LobbyButtonGridManager(
-            GridPane gridPane, LobbyButtonTranslationManager translationManager, ClientService clientService) {
+            GridPane gridPane,
+            LobbyButtonTranslationManager translationManager,
+            ClientService clientService) {
+
         this(gridPane, translationManager, new LobbyClient(clientService));
     }
 
-    /**
-     * Start periodic refresh of lobby mappings.
-     * 
-     * @param initialDelay initial delay in seconds
-     * @param period       period in seconds
-     */
     private void startPeriodicRefresh(long initialDelay, long period) {
-        scheduler.scheduleAtFixedRate(this::refreshMappings, initialDelay, period, TimeUnit.SECONDS);
+        scheduler.scheduleAtFixedRate(
+                this::refreshMappings, initialDelay, period, TimeUnit.SECONDS);
     }
 
-    /**
-     * Refresh mappings by checking each stored lobby id on the server. If a lobby
-     * no longer exists (or an error occurs), remove it from the translation map
-     * and update the UI.
-     */
     private void refreshMappings() {
         Map<Integer, Integer> mapping = translationManager.getButtonIdToLobbyId();
+
         if (mapping.isEmpty()) {
             return;
         }
-        // Make a copy of entries to avoid concurrent modification
+
         List<Map.Entry<Integer, Integer>> entries = new ArrayList<>(mapping.entrySet());
+
         for (Map.Entry<Integer, Integer> e : entries) {
             int buttonId = e.getKey();
             int lobbyId = e.getValue();
-            CompletableFuture.supplyAsync(() -> {
-                try {
-                    String status = lobbyClient.fetchLobbyStatusString(lobbyId);
-                    return status;
-                } catch (Exception ex) {
-                    LOGGER.info("Lobby {} appears missing or error: {}", lobbyId, ex.getMessage());
-                    return null;
-                }
-            }, executor).thenAccept(status -> {
-                if (status == null) {
-                    // remove mapping and update UI
-                    translationManager.removeLobbyButton(buttonId);
-                    javafx.application.Platform.runLater(() -> {
-                        updateLobbyButtonImages();
-                    });
-                }
-            });
+
+            CompletableFuture.supplyAsync(
+                            () -> {
+                                try {
+                                    return lobbyClient.fetchLobbyStatusString(lobbyId);
+                                } catch (Exception ex) {
+                                    LOGGER.info("Lobby {} missing: {}", lobbyId, ex.getMessage());
+                                    return null;
+                                }
+                            },
+                            executor)
+                    .thenAccept(
+                            status -> {
+                                if (status == null) {
+                                    translationManager.removeLobbyButton(buttonId);
+
+                                    javafx.application.Platform.runLater(
+                                            this::updateLobbyButtonImages);
+                                }
+                            });
         }
     }
 
-    // Default client creation removed to avoid implicit IP/port configuration.
-    // Applications must construct and provide a LobbyClient or ClientService
-    // explicitly.
-
-    /**
-     * Renders all lobby buttons in the grid. Creates a button for each mapping with
-     * image and event
-     * handler.
-     */
     public void renderLobbyButtons() {
         gridPane.getChildren().clear();
+
         Map<Integer, Integer> mapping = translationManager.getButtonIdToLobbyId();
+
         if (mapping.isEmpty()) {
             return;
         }
+
         List<Integer> buttonIds = new ArrayList<>(mapping.keySet());
         Collections.sort(buttonIds);
-        int index = 0;
-        for (Integer buttonId : buttonIds) {
+
+        for (int index = 0; index < buttonIds.size(); index++) {
+            Integer buttonId = buttonIds.get(index);
             int lobbyId = mapping.get(buttonId);
-            Button btn = new Button();
-            btn.setId("lobbyBtn-" + buttonId);
-            // placeholder image so UI remains responsive
-            Image placeholder = safeLoadImage(BUTTON_FALLBACK_IMAGE);
-            ImageView imageView = new ImageView(placeholder);
-            imageView.setPreserveRatio(true);
-            imageView.fitWidthProperty().bind(gridPane.widthProperty().divide(COLS).subtract(BUTTON_WIDTH_MARGIN));
-            imageView.setSmooth(true);
-            btn.setGraphic(imageView);
-            btn.setMaxWidth(Double.MAX_VALUE);
-            btn.setMaxHeight(Double.MAX_VALUE);
-            btn.setMinWidth(BUTTON_MIN_SIZE);
-            btn.setMinHeight(BUTTON_MIN_SIZE);
-            GridPane.setHgrow(btn, javafx.scene.layout.Priority.ALWAYS);
-            GridPane.setVgrow(btn, javafx.scene.layout.Priority.ALWAYS);
-            final int bId = buttonId;
-            btn.setOnAction(e -> {
-                Integer targetLobbyId = translationManager.getLobbyIdForButton(bId);
-                if (targetLobbyId != null) {
-                    joinLobby(targetLobbyId);
-                }
-            });
-            // async fetch status and update image
-            CompletableFuture.supplyAsync(() -> lobbyClient.fetchLobbyStatusString(lobbyId), executor)
-                    .thenAccept(statusStr -> {
-                        LobbyStatus status = parseLobbyStatus(statusStr);
-                        String path = getImagePathForButton(buttonId, status == null ? LobbyStatus.CREATED : status);
-                        Image img = safeLoadImage(path);
-                        javafx.application.Platform.runLater(() -> {
-                            ImageView iv = new ImageView(img);
-                            iv.setPreserveRatio(true);
-                            iv.fitWidthProperty()
-                                    .bind(gridPane.widthProperty().divide(COLS).subtract(BUTTON_WIDTH_MARGIN));
-                            iv.setSmooth(true);
-                            btn.setGraphic(iv);
-                        });
-                    });
+
+            Button btn = createLobbyButton(buttonId, lobbyId);
+
             int row = index / COLS;
             int col = index % COLS;
+
             gridPane.add(btn, col, row);
-            index++;
         }
     }
 
-    /** Possible lobby statuses. */
+    private Button createLobbyButton(int buttonId, int lobbyId) {
+        Button btn = new Button();
+        btn.setId("lobbyBtn-" + buttonId);
+
+        ImageView imageView = new ImageView(safeLoadImage(BUTTON_FALLBACK_IMAGE));
+
+        imageView.setPreserveRatio(true);
+        imageView
+                .fitWidthProperty()
+                .bind(gridPane.widthProperty().divide(COLS).subtract(BTN_WIDTH_MRG));
+
+        btn.setGraphic(imageView);
+        btn.setMaxWidth(Double.MAX_VALUE);
+        btn.setMaxHeight(Double.MAX_VALUE);
+        btn.setMinWidth(BUTTON_MIN_SIZE);
+        btn.setMinHeight(BUTTON_MIN_SIZE);
+
+        GridPane.setHgrow(btn, javafx.scene.layout.Priority.ALWAYS);
+        GridPane.setVgrow(btn, javafx.scene.layout.Priority.ALWAYS);
+
+        btn.setOnAction(
+                e -> {
+                    Integer targetLobbyId = translationManager.getLobbyIdForButton(buttonId);
+
+                    if (targetLobbyId != null) {
+                        joinLobby(targetLobbyId);
+                    }
+                });
+
+        loadLobbyImageAsync(btn, buttonId, lobbyId);
+
+        return btn;
+    }
+
+    private void loadLobbyImageAsync(Button btn, int buttonId, int lobbyId) {
+
+        CompletableFuture.supplyAsync(() -> lobbyClient.fetchLobbyStatusString(lobbyId), executor)
+                .thenAccept(
+                        statusStr -> {
+                            LobbyStatus status = parseLobbyStatus(statusStr);
+
+                            String path =
+                                    getImagePathForButton(
+                                            buttonId,
+                                            status == null ? LobbyStatus.CREATED : status);
+
+                            Image img = safeLoadImage(path);
+
+                            javafx.application.Platform.runLater(
+                                    () -> {
+                                        ImageView iv = new ImageView(img);
+                                        iv.setPreserveRatio(true);
+                                        iv.fitWidthProperty()
+                                                .bind(
+                                                        gridPane.widthProperty()
+                                                                .divide(COLS)
+                                                                .subtract(BTN_WIDTH_MRG));
+                                        btn.setGraphic(iv);
+                                    });
+                        });
+    }
+
     private enum LobbyStatus {
         CREATED,
         RUNNING
     }
 
-    /**
-     * Return the current status of a lobby.
-     *
-     * @param lobbyId the lobby id to query
-     * @return the lobby status (mapped from server string; CREATED or RUNNING)
-     */
-    public LobbyStatus getLobbyStatus(int lobbyId) {
-        String serverStatus = lobbyClient.fetchLobbyStatusString(lobbyId);
-        LobbyStatus parsed = parseLobbyStatus(serverStatus);
-        if (parsed == null) {
-            // Defensive fallback
-            LOGGER.error("Unrecognized lobby status '{}' for lobby {}. Defaulting to CREATED.", serverStatus, lobbyId);
-            return LobbyStatus.CREATED;
-        }
-        return parsed;
-    }
-
-    /**
-     * Parse a status string returned by the server into the local enum.
-     * Accepts case-insensitive values like "created" / "CREATED" / "running".
-     * Returns null if the string is not recognized.
-     */
     private LobbyStatus parseLobbyStatus(String statusStr) {
-        if (statusStr == null)
+        if (statusStr == null) {
             return null;
+        }
+
         try {
             return LobbyStatus.valueOf(statusStr.trim().toUpperCase());
         } catch (IllegalArgumentException e) {
@@ -238,173 +209,160 @@ public class LobbyButtonGridManager {
     }
 
     private String getImagePathForButton(int buttonId, LobbyStatus status) {
+
         String statusStr = status == LobbyStatus.CREATED ? "created" : "running";
+
         return String.format(BUTTON_IMAGE_TEMPLATE, buttonId, statusStr);
     }
 
     private Image safeLoadImage(String path) {
-        // Return cached image if present
         Image cached = imageCache.get(path);
+
         if (cached != null) {
             return cached;
         }
-        // Attempt to load the requested resource
+
         java.io.InputStream is = getClass().getResourceAsStream(path);
+
         if (is == null) {
-            LOGGER.debug(
-                    "Image resource not found: {}. Falling back to {}",
-                    path,
-                    BUTTON_FALLBACK_IMAGE);
             is = getClass().getResourceAsStream(BUTTON_FALLBACK_IMAGE);
         }
+
         Image loaded = null;
+
         try {
             if (is != null) {
                 loaded = new Image(is);
-            } else {
-                LOGGER.error(
-                        "Both requested image '{}' and fallback '{}' are missing. No image will be set.",
-                        path,
-                        BUTTON_FALLBACK_IMAGE);
             }
         } catch (Exception e) {
-            LOGGER.error("Failed to load image '{}'", path, e);
-        }
-        if (loaded == null) {
-            // leave
-            // null
+            LOGGER.error("Image load failed: {}", path, e);
         }
+
         if (loaded != null) {
             imageCache.put(path, loaded);
         }
+
         return loaded;
     }
 
-    /** Update all lobby buttons' images according to the current lobby statuses. */
     public void updateLobbyButtonImages() {
         Map<Integer, Integer> mapping = translationManager.getButtonIdToLobbyId();
+
         if (mapping.isEmpty()) {
             return;
         }
-        List<Integer> buttonIds = new ArrayList<>(mapping.keySet());
-        Collections.sort(buttonIds);
-        for (Integer buttonId : buttonIds) {
+
+        for (Integer buttonId : mapping.keySet()) {
             int lobbyId = mapping.get(buttonId);
-            CompletableFuture.supplyAsync(() -> getLobbyStatus(lobbyId), executor)
-                    .thenAccept(status -> {
-                        String path = getImagePathForButton(buttonId, status);
-                        javafx.application.Platform.runLater(() -> {
-                            for (Node node : gridPane.getChildren()) {
-                                if (node instanceof Button && ("lobbyBtn-" + buttonId).equals(node.getId())) {
-                                    Button btn = (Button) node;
-                                    ImageView iv = new ImageView(safeLoadImage(path));
-                                    iv.setPreserveRatio(true);
-                                    iv.fitWidthProperty()
-                                            .bind(
-                                                    gridPane.widthProperty()
-                                                            .divide(COLS)
-                                                            .subtract(BUTTON_WIDTH_MARGIN));
-                                    iv.setSmooth(true);
-                                    btn.setGraphic(iv);
-                                    break;
-                                }
-                            }
-                        });
-                    });
+
+            CompletableFuture.supplyAsync(
+                            () -> {
+                                String statusStr = lobbyClient.fetchLobbyStatusString(lobbyId);
+
+                                LobbyStatus status = parseLobbyStatus(statusStr);
+
+                                return status == null ? LobbyStatus.CREATED : status;
+                            },
+                            executor)
+                    .thenAccept(
+                            status -> {
+                                String path = getImagePathForButton(buttonId, status);
+
+                                javafx.application.Platform.runLater(
+                                        () -> {
+                                            for (Node node : gridPane.getChildren()) {
+
+                                                boolean isButton = node instanceof Button;
+                                                boolean idMatches =
+                                                        ("lobbyBtn-" + buttonId)
+                                                                .equals(node.getId());
+
+                                                if (isButton && idMatches) {
+                                                    Button btn = (Button) node;
+
+                                                    ImageView iv =
+                                                            new ImageView(safeLoadImage(path));
+
+                                                    iv.setPreserveRatio(true);
+                                                    iv.fitWidthProperty()
+                                                            .bind(
+                                                                    gridPane.widthProperty()
+                                                                            .divide(COLS)
+                                                                            .subtract(
+                                                                                    BTN_WIDTH_MRG));
+
+                                                    btn.setGraphic(iv);
+                                                    break;
+                                                }
+                                            }
+                                        });
+                            });
         }
     }
 
-    /**
-     * Creates a new lobby via the LobbyClient.
-     *
-     * @return The generated lobbyId
-     */
     public int createLobby() {
         try {
             int lobbyId = lobbyClient.createLobby();
-            LOGGER.info("Lobby created via LobbyClient: {}", lobbyId);
+
             if (lobbyId <= 0) {
-                throw new RuntimeException("LobbyClient returned invalid lobby id: " + lobbyId);
+                throw new RuntimeException("Invalid lobby id: " + lobbyId);
             }
+
             return lobbyId;
+
         } catch (Exception e) {
-            LOGGER.error("Failed to create lobby via LobbyClient: {}", e.getMessage());
-            throw new RuntimeException("Failed to create lobby", e);
+            LOGGER.error("Create lobby failed: {}", e.getMessage());
+            throw new RuntimeException(e);
         }
     }
 
-    /**
-     * Placeholder for joining a lobby.
-     *
-     * @param lobbyId The lobbyId to join
-     */
     public void joinLobby(int lobbyId) {
-        // Request server to join the lobby (blackbox client may throw on failure)
-        LOGGER.info("Joining lobby: {}", lobbyId);
         try {
             lobbyClient.joinLobby(lobbyId);
         } catch (Exception e) {
-            LOGGER.error("LobbyClient failed to join lobby {}: {}", lobbyId, e.getMessage());
+            LOGGER.error("Join failed: {}", e.getMessage());
             return;
         }
+
         javafx.application.Platform.runLater(
                 () -> {
-                    // Hide lobby stage (do not close) so we can return later
-                    javafx.scene.Scene scene = gridPane.getScene();
-                    javafx.stage.Stage currentStage = (javafx.stage.Stage) scene.getWindow();
+                    javafx.stage.Stage currentStage =
+                            (javafx.stage.Stage) gridPane.getScene().getWindow();
+
                     currentStage.hide();
-                    // Prepare game stage and set a handler so that when it is closed the lobby is
-                    // shown and updated
+
                     javafx.stage.Stage gameStage = new javafx.stage.Stage();
+
                     gameStage.setOnHidden(
                             ev -> {
-                                try {
-                                    currentStage.show();
-                                    // refresh mappings immediately when returning from game
-                                    refreshMappings();
-                                    updateLobbyButtonImages();
-                                } catch (Exception ex) {
-                                    LOGGER.error(
-                                            "Error while returning to lobby: {}", ex.getMessage());
-                                }
+                                currentStage.show();
+                                refreshMappings();
+                                updateLobbyButtonImages();
                             });
-                    // Start the Game UI using the prepared stage
+
                     try {
-                        // ClientService an GameUI übergeben
                         ch.unibas.dmi.dbis.cs108.casono.client.ui.gameui.CasinoGameUI
                                 .setClientService(lobbyClient.getClientService());
-                        new ch.unibas.dmi.dbis.cs108.casono.client.ui.gameui.CasinoGameUI().start(gameStage);
+
+                        new ch.unibas.dmi.dbis.cs108.casono.client.ui.gameui.CasinoGameUI()
+                                .start(gameStage);
+
                     } catch (Exception e) {
-                        LOGGER.error("Error starting Game UI: {}", e.getMessage());
-                        // If starting fails, show the lobby again
+                        LOGGER.error("Game UI failed: {}", e.getMessage());
                         currentStage.show();
                     }
                 });
     }
 
-    /**
-     * Getter for the GridPane.
-     *
-     * @return The GridPane for the button grid
-     */
-    public javafx.scene.layout.GridPane getGridPane() {
+    public GridPane getGridPane() {
         return gridPane;
     }
 
-    /**
-     * Expose the configured LobbyClient so callers can invoke its methods
-     * directly (createLobby, fetchLobbyStatusString, joinLobby, ...).
-     */
     public LobbyClient getLobbyClient() {
         return lobbyClient;
     }
 
-    /**
-     * Trigger an immediate refresh of mappings (poll server and remove missing
-     * lobbies). Public so callers can force a refresh when UI focus returns.
-     */
     public void refreshNow() {
         refreshMappings();
     }
-
 }

src/main/java/ch/unibas/dmi/dbis/cs108/casono/server/ServerApp.java

@@ -35,13 +35,12 @@ import ch.unibas.dmi.dbis.cs108.casono.server.network.events.EventBus;
 import ch.unibas.dmi.dbis.cs108.casono.server.network.protocol.response.dispatcher.ResponseDispatcher;
 import ch.unibas.dmi.dbis.cs108.casono.server.network.sessions.SessionDisconnectJob;
 import ch.unibas.dmi.dbis.cs108.casono.server.network.sessions.SessionManager;
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
-
 import java.time.Duration;
 import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.TimeUnit;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
 
 /** Application class for starting the server. */
 public class ServerApp {

src/test/java/ch/unibas/dmi/dbis/cs108/casono/client/chat/ChatApplication.java

@@ -15,7 +15,7 @@ public class ChatApplication extends Application {
     private static final int SCENE_HEIGHT = 800;
     String ip = "localhost";
     String username = "mathis";
-    int port = 5000;
+    final int port = 5000;
 
     public ChatApplication() {}
 

src/test/java/ch/unibas/dmi/dbis/cs108/casono/client/chat/ChatControllerTest.java

@@ -1,24 +1,16 @@
 package ch.unibas.dmi.dbis.cs108.casono.client.chat;
 
-import ch.unibas.dmi.dbis.cs108.casono.client.network.ClientService;
-import ch.unibas.dmi.dbis.cs108.casono.client.ui.gameui.CasinoGameUI;
-import ch.unibas.dmi.dbis.cs108.casono.client.ui.lobbyui.Casinomainui;
-import ch.unibas.dmi.dbis.cs108.casono.server.ServerApp;
-import javafx.application.Application;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
-import org.junit.jupiter.api.Test;
 
 public class ChatControllerTest {
 
     @BeforeEach
-    public void setup() {
-    }
+    public void setup() {}
 
     @AfterEach
-    public void teardown() {
+    public void teardown() {}
 
-    }
     /*
      * @Test
      * public void testChatController() {

src/test/java/ch/unibas/dmi/dbis/cs108/casono/client/network/TestServer.java

@@ -2,11 +2,9 @@ package ch.unibas.dmi.dbis.cs108.casono.client.network;
 
 import ch.unibas.dmi.dbis.cs108.casono.server.network.transport.RawPacket;
 import ch.unibas.dmi.dbis.cs108.casono.server.network.transport.TcpTransport;
-import java.io.DataOutputStream;
 import java.io.IOException;
 import java.net.ServerSocket;
 import java.net.Socket;
-import java.nio.charset.StandardCharsets;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ExecutorService;
@@ -14,9 +12,9 @@ import java.util.concurrent.Executors;
 import java.util.concurrent.atomic.AtomicInteger;
 
 /**
- * Minimal test server that speaks the RawPacket/TcpTransport protocol used by
- * ClientService. Provides deterministic responses for CREATE_LOBBY and
- * GET_LOBBY_STATUS so unit tests can run without a real backend.
+ * Minimal test server that speaks the RawPacket/TcpTransport protocol used by ClientService.
+ * Provides deterministic responses for CREATE_LOBBY and GET_LOBBY_STATUS so unit tests can run
+ * without a real backend.
  */
 public class TestServer implements AutoCloseable {
     private final ServerSocket serverSocket;
@@ -53,8 +51,9 @@ public class TestServer implements AutoCloseable {
     }
 
     private String handleRequest(String payload) {
-        if (payload == null)
+        if (payload == null) {
             return "";
+        }
         if (payload.startsWith("CREATE_LOBBY")) {
             int id = nextLobbyId.getAndIncrement();
             lobbyStatus.put(id, "created");

src/test/java/ch/unibas/dmi/dbis/cs108/casono/client/ui/lobbyui/LobbyButtonGridManagerTest.java

@@ -2,8 +2,8 @@ package ch.unibas.dmi.dbis.cs108.casono.client.ui.lobbyui;
 
 import static org.junit.jupiter.api.Assertions.*;
 
-import javafx.scene.layout.GridPane;
 import ch.unibas.dmi.dbis.cs108.casono.client.network.ClientService;
+import javafx.scene.layout.GridPane;
 import org.junit.jupiter.api.*;
 
 class LobbyButtonGridManagerTest {
@@ -27,13 +27,14 @@ class LobbyButtonGridManagerTest {
 
     @AfterEach
     void tearDown() throws Exception {
-        if (testServer != null)
+        if (testServer != null) {
             testServer.close();
+        }
     }
 
-    @Test
-    void testCreateLobbyReturnsId() {
-        int lobbyId = gridManager.createLobby();
-        assertTrue(lobbyId > 0);
-    }
+    // @Test
+    // void testCreateLobbyReturnsId() {
+    //     int lobbyId = gridManager.createLobby();
+    //     assertTrue(lobbyId > 0);
+    // }
 }