Feat: Add get_lobby_listcommand to server

src/main/java/ch/unibas/dmi/dbis/cs108/casono/server/app/commands/lobby/get_lobby_list/GetLobbyListHandler.java

@@ -0,0 +1,28 @@
+package ch.unibas.dmi.dbis.cs108.casono.server.app.commands.lobby.get_lobby_list;
+
+import ch.unibas.dmi.dbis.cs108.casono.server.domain.lobby.LobbyManager;
+import ch.unibas.dmi.dbis.cs108.casono.server.network.command.execution.CommandHandler;
+import ch.unibas.dmi.dbis.cs108.casono.server.network.protocol.response.dispatcher.ResponseDispatcher;
+import java.util.Collection;
+
+/**
+ * Handler for the `GET_LOBBY_LIST` command.
+ *
+ * <p>Queries the {@link LobbyManager} for all available lobbies and dispatches a {@link
+ * GetLobbyListResponse} containing basic metadata for each lobby (`ID`, `NAME`, `PLAYER_COUNT`).
+ */
+public class GetLobbyListHandler extends CommandHandler<GetLobbyListRequest> {
+    private final LobbyManager lobbyManager;
+
+    public GetLobbyListHandler(ResponseDispatcher responseDispatcher, LobbyManager lobbyManager) {
+        super(responseDispatcher);
+        this.lobbyManager = lobbyManager;
+    }
+
+    @Override
+    public void execute(GetLobbyListRequest request) {
+        Collection<ch.unibas.dmi.dbis.cs108.casono.server.domain.lobby.Lobby> l =
+                lobbyManager.getAllLobbies();
+        responseDispatcher.dispatch(new GetLobbyListResponse(request.getContext(), l));
+    }
+}

src/main/java/ch/unibas/dmi/dbis/cs108/casono/server/app/commands/lobby/get_lobby_list/GetLobbyListParser.java

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+package ch.unibas.dmi.dbis.cs108.casono.server.app.commands.lobby.get_lobby_list;
+
+import ch.unibas.dmi.dbis.cs108.casono.server.network.command.parsing.CommandParser;
+import ch.unibas.dmi.dbis.cs108.casono.server.network.protocol.request.PrimitiveRequest;
+
+/**
+ * Parser for the `GET_LOBBY_LIST` command.
+ *
+ * <p>Parses the incoming primitive request and produces a {@link GetLobbyListRequest}. This command
+ * takes no parameters.
+ */
+public class GetLobbyListParser implements CommandParser<GetLobbyListRequest> {
+    @Override
+    public GetLobbyListRequest parse(PrimitiveRequest primitiveRequest) {
+        return new GetLobbyListRequest(primitiveRequest.context());
+    }
+}

src/main/java/ch/unibas/dmi/dbis/cs108/casono/server/app/commands/lobby/get_lobby_list/GetLobbyListRequest.java

@@ -0,0 +1,15 @@
+package ch.unibas.dmi.dbis.cs108.casono.server.app.commands.lobby.get_lobby_list;
+
+import ch.unibas.dmi.dbis.cs108.casono.server.network.protocol.request.Request;
+import ch.unibas.dmi.dbis.cs108.casono.server.network.protocol.request.RequestContext;
+
+/**
+ * Request object for the `GET_LOBBY_LIST` command.
+ *
+ * <p>Contains only the request context; this command does not require parameters.
+ */
+public class GetLobbyListRequest extends Request {
+    public GetLobbyListRequest(RequestContext context) {
+        super(context);
+    }
+}

src/main/java/ch/unibas/dmi/dbis/cs108/casono/server/app/commands/lobby/get_lobby_list/GetLobbyListResponse.java

@@ -0,0 +1,37 @@
+package ch.unibas.dmi.dbis.cs108.casono.server.app.commands.lobby.get_lobby_list;
+
+import ch.unibas.dmi.dbis.cs108.casono.server.domain.lobby.Lobby;
+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;
+import java.util.Collection;
+
+/**
+ * Success response for `GET_LOBBY_LIST`.
+ *
+ * <p>Builds a `LOBBIES` collection with repeated `LOBBY` blocks containing `ID`, `NAME` and
+ * `PLAYER_COUNT`.
+ */
+public class GetLobbyListResponse extends SuccessResponse {
+    public GetLobbyListResponse(RequestContext context, Collection<Lobby> lobbies) {
+        super(
+                context,
+                ResponseBody.builder()
+                        .block(
+                                "LOBBIES",
+                                lobbies_block -> {
+                                    for (Lobby lobby : lobbies) {
+                                        lobbies_block.block(
+                                                "LOBBY",
+                                                lb -> {
+                                                    lb.param("ID", lobby.getId().value());
+                                                    lb.param("NAME", lobby.getName());
+                                                    lb.param(
+                                                            "PLAYER_COUNT",
+                                                            lobby.getPlayerNames().size());
+                                                });
+                                    }
+                                })
+                        .build());
+    }
+}