import argparse
import pprint
import logging

from restic_volume_backup import log
from restic_volume_backup.config import Config
from restic_volume_backup.containers import RunningContainers
from restic_volume_backup import backup_runner
from restic_volume_backup import restic

logger = logging.getLogger(__name__)


def main():
    """CLI entrypoint"""
    args = parse_args()
    config = Config()
    containers = RunningContainers()

    if args.action == 'status':
        status(config, containers)

    elif args.action == 'backup':
        backup(config, containers)

    elif args.action == 'start-backup-process':
        start_backup_process(config, containers)


def status(config, containers):
    """Outputs the backup config for the compose setup"""

    logger.info("Backup config for compose project '%s'", containers.this_container.project_name)
    logger.info("Current service: %s", containers.this_container.name)
    # logger.info("Backup process: %s", containers.backup_process_container.name
    #             if containers.backup_process_container else 'Not Running')
    logger.info("Backup running: %s", containers.backup_process_running)

    backup_containers = containers.containers_for_backup()
    for container in backup_containers:
        logger.info('service: %s', container.service_name)
        if container.volume_backup_enabled:

            for mount in container.filter_mounts():
                logger.info(' - volume: %s', mount.source)

        if container.database_backup_enabled:
            instance = container.instance
            print(instance.container_type)
            print(instance.ping())

    if len(backup_containers) == 0:
        logger.info("No containers in the project has 'restic-volume-backup.enabled' label")


def backup(config, containers):
    """Request a backup to start"""
    # Make sure we don't spawn multiple backup processes
    if containers.backup_process_running:
        raise ValueError("Backup process already running")

    logger.info("Initializing repository")

    # TODO: Errors when repo already exists
    restic.init_repo(config.repository)

    logger.info("Starting backup container..")

    # Map all volumes from the backup container into the backup process container
    volumes = containers.this_container.volumes

    # Map volumes from other containers we are backing up
    mounts = containers.generate_backup_mounts('/backup')
    volumes.update(mounts)
    pprint.pprint(volumes, indent=2)

    backup_runner.run(
        image=containers.this_container.image,
        command='restic-volume-backup start-backup-process',
        volumes=volumes,
        environment=containers.this_container.environment,
        labels={
            "restic-volume-backup.backup_process": 'True',
            "com.docker.compose.project": containers.this_container.project_name,
        },
    )


def start_backup_process(config, containers):
    """The actual backup process running inside the spawned container"""
    if (not containers.backup_process_container
       or containers.this_container == containers.backup_process_container is False):
        logger.error(
            "Cannot run backup process in this container. Use backup command instead. "
            "This will spawn a new container with the necessary mounts."
        )
        return

    status(config, containers)
    logger.info("start-backup-process")

    restic.backup_files(config.repository, source='/backup')

def parse_args():
    parser = argparse.ArgumentParser(prog='restic_volume_backup')
    parser.add_argument(
        'action',
        choices=['status', 'backup', 'start-backup-process'],
    )
    return parser.parse_args()


if __name__ == '__main__':
    main()