#!/usr/bin/env python3
import platform
import socket
from ipaddress import ip_address
from os import environ as env
from os import system
from os.path import exists, expanduser
from time import sleep
from typing import List

import novaclient.client
import novaclient.v2.client
from keystoneauth1.identity import v3
from keystoneauth1.session import Session
from novaclient.v2.keypairs import Keypair
from novaclient.v2.servers import Server
from pick import pick

SERVER_NAME='gbv'

def try_connect(ip: str) -> bool:
    sock = None
    try:
        sock = socket.create_connection((ip, 22), 1)
    except (socket.timeout, ConnectionRefusedError):
        return False
    sock.close()
    return True


def open_conn(ip: str, port: int = 23406):
    print('Opening tunnel...')
    system(f'ssh -D {port} -i ~/.ssh/id_ovh -o StrictHostKeyChecking=no -o GlobalKnownHostsFile=/dev/null -o UserKnownHostsFile=/dev/null -N debian@{ip}')


sess = Session(v3.Password(
    auth_url=env['OS_AUTH_URL'],
    username=env['OS_USERNAME'],
    password=env['OS_PASSWORD'],
    project_id=env['OS_TENANT_ID'],
    user_domain_name=env['OS_USER_DOMAIN_NAME']))

print('Logging in...')
nova: novaclient.v2.client.Client = novaclient.client.Client(
    "2.1", session=sess, region_name=env['OS_REGION_NAME'])

if not exists(expanduser('~/.ssh/id_ovh')):
    system("ssh-keygen -f ~/.ssh/id_ovh")

print('Making sure keypair is present...')
keypairs: List[Keypair] = nova.keypairs.list()
keyname = 'ovh_' + platform.uname()[1].split('.', 1)[0]
if keyname not in (k.name for k in keypairs):
    with open(expanduser('~/.ssh/id_ovh')) as f:
        print('Uploading keypair...')
        nova.keypairs.create(keyname, f.read())

flavor = nova.flavors.find(name='s1-2')
image = nova.glance.find_image('Debian 10')
net = nova.neutron.find_network('Ext-Net')

print('Creating server...')
nova.servers.create(SERVER_NAME, image, flavor,
                    nics=[{'net-id': net.id}], key_name=keyname)
sv: Server = nova.servers.find(name=SERVER_NAME)


while sv.status != 'ACTIVE':
    print('Waiting for server to POST...')
    sleep(5)
    sv = nova.servers.find(name=SERVER_NAME)
    pass

ips = []

interface = None
while not interface:
    interfaces = sv.interface_list()
    ext_interface = [k for k in interfaces if k.net_id == net.id]
    if ext_interface and ext_interface[0].port_state == 'ACTIVE':
        interface = ext_interface[0]
    else:
        sleep(2)

for i in interface.fixed_ips:
    ips.append(i['ip_address'])
ip = list(filter(lambda x: ip_address(x).version == 4, ips))[0]

while not try_connect(ip):
    print('Waiting for SSH service to become available...')
    sleep(4)
    pass

open_conn(ip)

exit = False
while not exit:
    choice = pick(['Reconnect', 'Destroy server and exit', 'Keep server online and exit'],
                  'The connection has ended. How do you want to proceed?')[0]
    if choice == 'Reconnect':
        open_conn(ip)
    elif choice == 'Destroy server and exit':
        sv.delete()
        exit = True
    else:
        exit = True