from argparse import ArgumentParser
from .config import ConfigReader, ReadingError
from .dispatcher import Dispatcher, DispatchError
from .messenger import Messenger
from .messenger import Level

def add_options(parser):
    parser.add_argument('-Q', '--super-quiet', dest='super_quiet', action='store_true',
        help='suppress almost all output')
    parser.add_argument('-q', '--quiet', dest='quiet', action='store_true',
        help='suppress most output')
    parser.add_argument('-v', '--verbose', dest='verbose', action='store_true',
        help='enable verbose output')
    parser.add_argument('-d', '--base-directory', nargs=1,
        dest='base_directory', help='execute commands from within BASEDIR',
        metavar='BASEDIR', required=True)
    parser.add_argument('-c', '--config-file', nargs=1, dest='config_file',
        help='run commands given in CONFIGFILE', metavar='CONFIGFILE',
        required=True)

def read_config(config_file):
    reader = ConfigReader(config_file)
    return reader.get_config()

def main():
    log = Messenger()
    try:
        parser = ArgumentParser()
        add_options(parser)
        options = parser.parse_args()
        if (options.super_quiet):
            log.set_level(Level.WARNING)
        if (options.quiet):
            log.set_level(Level.INFO)
        if (options.verbose):
            log.set_level(Level.DEBUG)
        tasks = read_config(options.config_file[0])
        if not isinstance(tasks, list):
            raise ReadingError('Configuration file must be a list of tasks')
        dispatcher = Dispatcher(options.base_directory[0])
        success = dispatcher.dispatch(tasks)
        if success:
            log.info('\n==> All tasks executed successfully')
        else:
            raise DispatchError('\n==> Some tasks were not executed successfully')
    except (ReadingError, DispatchError) as e:
        log.error('%s' % e)
        exit(1)
    except KeyboardInterrupt:
        log.error('\n==> Operation aborted')
        exit(1)