# In-memory room management
# rooms = { "room_id": [socket_id1, socket_id2, ...] }
rooms = {}


def add_user_to_room(room_id: str, socket_id: str):
    """Add a socket_id to the given room."""
    if room_id not in rooms:
        rooms[room_id] = []
    if socket_id not in rooms[room_id]:
        rooms[room_id].append(socket_id)


def remove_user_from_room(socket_id: str):
    """Remove a socket_id from ALL rooms it belongs to."""
    for room_id in list(rooms.keys()):
        if socket_id in rooms[room_id]:
            rooms[room_id].remove(socket_id)
            # Clean up empty rooms
            if not rooms[room_id]:
                del rooms[room_id]


def get_room_members(room_id: str) -> list:
    """Return list of socket IDs in a room."""
    return rooms.get(room_id, [])