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()

backend/game/game.go

@@ -123,6 +123,24 @@ func UpdateGameState(room *types.Room, newState types.GameState) {
 	OnRoomUpdate(room)
 }
 
+func SetCardDeck(room *types.Room, id int) bool {
+	if id < 0 || id > 1 {
+		return false
+	}
+	room.CardDeckId = id
+	OnRoomUpdate(room)
+	return true
+}
+
+func CreateCardDeckObj(room *types.Room) {
+	switch room.CardDeckId {
+	case 0:
+		room.CardDeck = &decks.Classic{}
+	case 1:
+		room.CardDeck = &decks.HexV1{}
+	}
+}
+
 func BroadcastInRoom(room *types.Room, topic string, data interface{}) {
 	for _, player := range room.Players {
 		if !player.Connection.IsConnected || player.Connection.Socket == nil {
@@ -179,7 +197,7 @@ func StartGame(room *types.Room) {
 	if room.GameState != types.StateLobby {
 		return
 	}
-	room.CardDeck = &decks.Classic{}
+	CreateCardDeckObj(room)
 	room.CardDeck.Init(room)
 	UpdateGameState(room, types.StateRunning)
 	UpdateAllPlayers(room)

backend/types/websocket_packets.go

@@ -47,6 +47,9 @@ type S2C_PlayedCardUpdate struct {
 	Card      Card
 }
 
+type C2S_SetCardDeck struct {
+	CardDeckId int
+}
 type C2S_UpdatePlayer struct {
 	PlayerId    bson.ObjectID
 	Username    *string