feat(backend): implement changing card deck

backend/api/websocket.go

@@ -95,6 +95,36 @@ func onPlayerJoin(client *socketio.Socket, room *types.Room, player *types.Playe
 		game.OnRoomUpdate(room)
 	})
 
+	client.On("SetCardDeck", func(datas ...any) {
+		setCardDeckRequest := types.C2S_SetCardDeck{}
+		unpackData(datas, &setCardDeckRequest)
+
+		if room.GameState != types.StateLobby {
+			client.Emit("Status", types.S2C_Status{
+				IsError:    true,
+				StatusCode: "game_already_running",
+				Message:    "You can't change the card deck while the game is running",
+			})
+			return
+		}
+		if !player.HasPermissionBit(types.PermissionHost) {
+			client.Emit("Status", types.S2C_Status{
+				IsError:    true,
+				StatusCode: "insufficient_permission",
+				Message:    "You can't change the card deck unless you are host",
+			})
+			return
+		}
+		if !game.SetCardDeck(room, setCardDeckRequest.CardDeckId) {
+			client.Emit("Status", types.S2C_Status{
+				IsError:    true,
+				StatusCode: "invalid_card_deck",
+				Message:    "No card deck exists with this ID",
+			})
+			return
+		}
+	})
+
 	client.On("UpdatePlayer", func(datas ...any) {
 		player.Mutex.Lock()
 		defer player.Mutex.Unlock()