#!/usr/bin/env python3
import logging
import sys
import importlib
import argparse
import multiprocessing as mp

from uncloud import UncloudException
from contextlib import suppress


def exception_hook(exc_type, exc_value, exc_traceback):
    logging.getLogger(__name__).error(
        'Uncaught exception',
        exc_info=(exc_type, exc_value, exc_traceback)
    )


sys.excepthook = exception_hook

if __name__ == '__main__':
    # Setting up root logger
    logger = logging.getLogger()
    logger.setLevel(logging.DEBUG)

    arg_parser = argparse.ArgumentParser()
    subparsers = arg_parser.add_subparsers(dest='command')

    parent_parser = argparse.ArgumentParser(add_help=False)
    parent_parser.add_argument('--debug', '-d', action='store_true', default=False,
                               help='More verbose logging')

    for component in ['api', 'scheduler', 'host', 'filescanner', 'imagescanner',
                      'metadata', 'configure', 'cli']:
        mod = importlib.import_module('uncloud.{}.main'.format(component))
        parser = getattr(mod, 'arg_parser')
        subparsers.add_parser(name=parser.prog, parents=[parser, parent_parser])

    args = arg_parser.parse_args()
    if not args.command:
        arg_parser.print_help()
    else:

        # if we start etcd in seperate process with default settings
        # i.e inheriting few things from parent process etcd3 module
        # errors out, so the following command configure multiprocessing
        # module to not inherit anything from parent.
        mp.set_start_method('spawn')
        arguments = vars(args)
        try:
            name = arguments.pop('command')
            mod = importlib.import_module('uncloud.{}.main'.format(name))
            main = getattr(mod, 'main')
            main(**arguments)
        except UncloudException as err:
            logger.error(err)
        except Exception as err:
            logger.exception(err)