#!/usr/bin/env python3

from pathlib import Path
from typing import Iterable, Set

import click
import docker
import restic
from docker.models.containers import Container

client = docker.from_env()

def stop_containers(names: Iterable[str]) -> Set[Container]:
    names = set(names)
    stopped_containers = set()
    for con in client.containers.list():
        if con.name in names:
            stopped_containers.add(con)
            try:
                con.stop()
            except:
                print('Error')
                break
            else:
                print(f'Stopped [{con.short_id}] {con.name}')
    return stopped_containers


def start_containers(containers: Iterable[Container]):
    for con in containers:
        try:
            con.start()
        except:
            print(f'Error starting: [{con.short_id}] {con.name}')
        else:
            print(f'Started: [{con.short_id}] {con.name}')


@click.command()
@click.argument('src', type=click.Path(exists=True, file_okay=False, readable=True, resolve_path=True, path_type=Path))
@click.option('-ds', '--docker-stop', type=click.STRING,
              help='Comma-delimited list of the container names to stop before running the backup')
def main(src: Path, docker_stop: str = None):
    print(type(src).__name__, src)

    if docker_stop is not None:
        cons = stop_containers(docker_stop.split(','))
    else:
        cons = set()

    pw_file = Path('/run/secrets/restic-pw').resolve()
    restic.password_file = pw_file.as_posix()

    restic.backup(
        paths=[''],
        dry_run=True
    )

    print(f'{len(restic.snapshots())} snapshots found in the repo')

    start_containers(cons)


if __name__ == '__main__':
    main()