#!/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
    """
    try:
        worker = None
        return_code = 1

        # check min. python version
        if sys.version_info < (3, 6):
            raise SystemError("Freqtrade requires Python version >= 3.6")

        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)
            # TODO: fetch return_code as returned by the command function here
            return_code = 0
            return

        # 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 as e:
        logger.exception('Fatal exception! ' + str(e))
    finally:
        if worker:
            worker.exit()
        sys.exit(return_code)


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