from db.redis import (
    add_presence,
    remove_presence,
    get_presence
)


async def user_join_group(group_id: str, user_id: str):
    """
    Called when websocket connects
    """
    await add_presence(group_id, user_id)


async def user_leave_group(group_id: str, user_id: str):
    """
    Called when websocket disconnects
    """
    await remove_presence(group_id, user_id)


async def list_online_users(group_id: str):
    """
    Returns online users in a group
    """
    return await get_presence(group_id)