"""
Example for a Spawner.pre_spawn_hook
create a directory for the user before the spawner starts
"""
# pylint: disable=import-error
import os
import shutil

from jupyter_client.localinterfaces import public_ips


def create_dir_hook(spawner):
    """Create directory"""
    username = spawner.user.name  # get the username
    volume_path = os.path.join('/volumes/jupyterhub', username)
    if not os.path.exists(volume_path):
        os.mkdir(volume_path, 0o755)
        # now do whatever you think your user needs
        # ...


def clean_dir_hook(spawner):
    """Delete directory"""
    username = spawner.user.name  # get the username
    temp_path = os.path.join('/volumes/jupyterhub', username, 'temp')
    if os.path.exists(temp_path) and os.path.isdir(temp_path):
        shutil.rmtree(temp_path)


# attach the hook functions to the spawner
# pylint: disable=undefined-variable
c.Spawner.pre_spawn_hook = create_dir_hook
c.Spawner.post_stop_hook = clean_dir_hook

# Use the DockerSpawner to serve your users' notebooks
c.JupyterHub.spawner_class = 'dockerspawner.DockerSpawner'
c.JupyterHub.hub_ip = public_ips()[0]
c.DockerSpawner.hub_ip_connect = public_ips()[0]
c.DockerSpawner.container_ip = "0.0.0.0"

# You can now mount the volume to the docker container as we've
# made sure the directory exists
# pylint: disable=bad-whitespace
c.DockerSpawner.volumes = {'/volumes/jupyterhub/{username}/': '/home/jovyan/work'}