"""
Parse commandline arguments and provide global variables for settings.
"""

import argparse


class Settings():
    file = None
    sort = "time"
    debug = False

    def __init__(self):
        parser = argparse.ArgumentParser(description='IHK Dijkstra Projekt.')
        parser.add_argument('file', help='The input file.')
        parser.add_argument(
                '-sort',
                default='time',
                help='Whether to sort after "time" or "co2"')
        parser.add_argument(
                '-debug',
                action='store_true',
                help='Show debug output.')
        args = parser.parse_args()
        assert(args.sort == "time" or args.sort == "co2")

        # update default values
        self.file = args.file
        self.debug = args.debug
        self.sort = args.sort