#!/usr/bin/env python3
"""
Main Freqtrade bot script.
Read the documentation to know what cli arguments you need.
"""
import logging
import sys
from argparse import Namespace
from typing import List

from freqtrade import OperationalException
from freqtrade.arguments import Arguments
from freqtrade.configuration import set_loggers
from freqtrade.worker import Worker


logger = logging.getLogger('freqtrade')


def main(sysargv: List[str]) -> None:
    """
    This function will initiate the bot and start the trading loop.
    :return: None
    """
    arguments = Arguments(
        sysargv,
        'Free, open source crypto trading bot'
    )
    args: Namespace = arguments.get_parsed_arg()

    # A subcommand has been issued.
    # Means if Backtesting or Hyperopt have been called we exit the bot
    if hasattr(args, 'func'):
        args.func(args)
        return

    worker = None
    return_code = 1
    try:
        # Load and run worker
        worker = Worker(args)
        worker.run()

    except KeyboardInterrupt:
        logger.info('SIGINT received, aborting ...')
        return_code = 0
    except OperationalException as e:
        logger.error(str(e))
        return_code = 2
    except BaseException:
        logger.exception('Fatal exception!')
    finally:
        if worker:
            worker.exit()
        sys.exit(return_code)


if __name__ == '__main__':
    set_loggers()
    main(sys.argv[1:])