"""
Command-Line Interface support
"""

import argparse
import os


class CLIParser(argparse.ArgumentParser):
    """ABC for CLI parsing"""

    def __init__(self, **kwargs):
        argparse.ArgumentParser.__init__(self, **kwargs)
        self.add_arguments()
        self.options = None

    def add_arguments(self):
        self.add_argument('-v', '--verbose', dest='verbose',
                          action='store_true', default=False,
                          help="be more verbose")

    def parse_args(self, args):

        options = argparse.ArgumentParser.parse_args(self, args)
        self.options = self.validate(options)
        return self.options

    def validate(self, options):

        if not getattr(options, 'verbose', False):
            # https://github.com/tensorflow/tensorflow/issues/7778
            os.environ['TF_CPP_MIN_LOG_LEVEL'] = '2'

        return options