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

@@ -10,6 +10,7 @@ import java.util.List;
 public class GameState {
     public List<Player> players = new ArrayList<>();
     public List<Card> communityCards = new ArrayList<>();
+    public List<String> highscoreEntries = new ArrayList<>();
 
     public String phase;
     public int pot;

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

@@ -155,6 +155,10 @@ public class GameClient {
                 s.winnerIndex = intVal(l);
                 yield true;
             }
+            case String l when l.startsWith("HIGHSCORE=") -> {
+                s.highscoreEntries.add(value(l));
+                yield true;
+            }
             default -> false;
         };
     }

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

@@ -81,6 +81,30 @@ public class LobbyClient {
         throw new RuntimeException("No LOBBY_ID in response: " + lines);
     }
 
+    /**
+     * Fetches the global highscores from the server.
+     *
+     * @return list of formatted highscore entries, newest entries at the end
+     */
+    public List<String> getHighscores() {
+        List<String> lines = client.processCommand("GET_HIGHSCORES");
+        List<RequestParameter> params = ClientService.convertToRequestParameters(lines);
+
+        List<String> entries = new ArrayList<>();
+        for (RequestParameter p : params) {
+            if ("HIGHSCORE".equalsIgnoreCase(p.key())) {
+                entries.add(p.value());
+            }
+        }
+
+        return entries;
+    }
+
+    /** Clears all global highscores on the server. */
+    public void clearHighscores() {
+        client.processCommand("CLEAR_HIGHSCORES");
+    }
+
     /**
      * Request the server to return the id of the lobby that the client is currently in.
      *

src/main/java/ch/unibas/dmi/dbis/cs108/casono/server/app/commands/game/get_game_state/GetGameStateResponse.java

@@ -8,6 +8,7 @@ import ch.unibas.dmi.dbis.cs108.casono.server.domain.game.player.Player;
 import ch.unibas.dmi.dbis.cs108.casono.server.domain.game.player.PlayerId;
 import ch.unibas.dmi.dbis.cs108.casono.server.domain.game.state.GamePhase;
 import ch.unibas.dmi.dbis.cs108.casono.server.domain.game.state.GameState;
+import ch.unibas.dmi.dbis.cs108.casono.server.domain.highscore.HighscoreService;
 import ch.unibas.dmi.dbis.cs108.casono.server.network.protocol.request.RequestContext;
 import ch.unibas.dmi.dbis.cs108.casono.server.network.protocol.response.SuccessResponse;
 import ch.unibas.dmi.dbis.cs108.casono.server.network.protocol.response.builder.ResponseBody;
@@ -50,7 +51,11 @@ public class GetGameStateResponse extends SuccessResponse {
         builder.param("CURRENT_BET", computeGlobalCurrentBet(state));
         builder.param("DEALER", state.getDealerIndex());
         builder.param("ACTIVE_PLAYER", state.getCurrentPlayerIndex());
-        builder.param("WINNER", computeWinnerIndex(state, game));
+        int winnerIndex = computeWinnerIndex(state, game);
+        builder.param("WINNER", winnerIndex);
+
+        appendWinnerToHighscoresIfFinished(state, winnerIndex);
+        appendHighscoreEntries(builder);
 
         appendCommunityCards(builder, state);
 
@@ -59,6 +64,36 @@ public class GetGameStateResponse extends SuccessResponse {
         return builder.build();
     }
 
+    private static void appendWinnerToHighscoresIfFinished(GameState state, int winnerIndex) {
+        if (winnerIndex < 0 || state.getPhase() != GamePhase.FINISHED) {
+            return;
+        }
+
+        Player winner = findPlayerByIndex(state, winnerIndex);
+        if (winner == null || winner.getId() == null || winner.getId().value() == null) {
+            return;
+        }
+
+        HighscoreService.getInstance().appendWinner(winner.getId().value());
+    }
+
+    private static Player findPlayerByIndex(GameState state, int winnerIndex) {
+        int currentIndex = 0;
+        for (Player player : state.getPlayers()) {
+            if (currentIndex == winnerIndex) {
+                return player;
+            }
+            currentIndex++;
+        }
+        return null;
+    }
+
+    private static void appendHighscoreEntries(ResponseBodyBuilder builder) {
+        for (String entry : HighscoreService.getInstance().readFormattedEntries()) {
+            builder.param("HIGHSCORE", entry);
+        }
+    }
+
     private static int computeWinnerIndex(GameState state, GameController game) {
         GamePhase phase = state.getPhase();
         if (phase != GamePhase.SHOWDOWN && phase != GamePhase.FINISHED) {