from getpass import getpass
import os
import logging
import threading

import click
from paramiko import SSHClient
from scp import SCPClient

DEFAULT_HOSTNAMES = [
    'test-inventory-provider01.geant.org',
    'test-inventory-provider02.geant.org'
]


def _install_proc(hostname, username, password, sdist):

    logging.info(f'installing on {hostname}')

    scp_destination = f'/tmp/{os.path.basename(sdist)}'

    ssh = SSHClient()
    ssh.load_system_host_keys()
    ssh.connect(hostname=hostname, username=username, password=password)
    scp = SCPClient(ssh.get_transport())
    scp.put(sdist, scp_destination)

    channel = ssh.invoke_shell()
    stdin = channel.makefile('wb')
    stdout = channel.makefile('rb')

    pip = '/home/inventory/venv/bin/pip'
    commands = [
        f'sudo su - -c \'{pip} uninstall -y inventory\'',
        f'sudo su - -c \'{pip} install {scp_destination}\'',
        f'rm {scp_destination}',
        'chown -R inventory.inventory /home/inventory/venv',
        'exit'
    ]
    stdin.write('\n'.join(commands) + '\n')
    print('\n'.join(commands))
    print(stdout.read())
    stdout.close()
    stdin.close()

    processes = [
        'inventory-provider.service',
        'inventory-worker.service',
        'inventory-monitor.service'
    ]
    restart_cmd = 'sudo su - -c \'systemctl restart ' \
        + ' '.join(processes) + '\''
    stdin, stdout, _ = ssh.exec_command(restart_cmd)
    output = stdout.read()
    status = stdout.channel.recv_exit_status()
    logging.debug(f'status: {status}, output: {output}')

    ssh.close()

    logging.info(f'finished installing on {hostname}')


@click.command()
@click.option(
    "--hostname",
    multiple=True,
    default=DEFAULT_HOSTNAMES,
    type=click.STRING,
    help="hostname [%r]"
         % str(DEFAULT_HOSTNAMES))
@click.option(
    "--user",
    default=None,
    type=click.STRING,
    help="ssh username")
@click.option(
    "--sdist",
    required=True,
    type=click.Path(exists=True, dir_okay=False),
    help="sdist filename")
def cli(hostname, user, sdist):
    password = getpass(prompt='Password: ', stream=None)

    def _make_thread(h):
        t = threading.Thread(
            target=_install_proc,
            args=[h, user, password, sdist])
        t.start()
        return t

    threads = [_make_thread(h) for h in hostname]

    for t in threads:
        t.join()


if __name__ == '__main__':
    logging.basicConfig(level=logging.INFO)
    cli()