#!/usr/bin/python3
# -----------------------------------------------------------------------------
# Wachtwoord genereren.
# *** Leerobject voor Python. ***
# *** Gebruik Bitwarden voor wachtwoorden! ***
#
# Geschreven door Karel Zimmer <info@karelzimmer.nl>.
# Auteursrecht (c) 2020-2021 Karel Zimmer.
# GNU Algemene Publieke Licentie <https://www.gnu.org/licenses/gpl.html>.
#
# RelNum=02.00.08
# RelDat=2021-01-15
# -----------------------------------------------------------------------------
import os
import random
import argparse

progname = os.path.basename(__file__)

# Setup the command-line parsing module argparse.
parser = argparse.ArgumentParser(description='Wachtwoord genereren.',
                                 epilog="Typ 'man " + progname + "' voor meer "
                                        'informatie.')
parser.add_argument('-g', '--gui', action='store_true',
                    help='start in grafische modus')
parser.add_argument('-u', '--usage', action='store_true',
                    help='een korte gebruikssamenvatting tonen')
parser.add_argument('-v', '--version', action='store_true',
                    help='de versie tonen')
args = parser.parse_args()

# Proccess input.
if args.usage:
    print(f"""Gebruik: {progname} [-g|--gui] [-h|--help] [-u|--usage] \
[-v|--version]

Typ '{progname} --help' voor meer informatie.""")
elif args.version:
    file = os.path.realpath(__file__)
    release_number = release_date = copyright_years = None

    # Find release_number, release_date, and copyright_years in this script.
    with open(file) as f:
        datafile = f.readlines()
        for line in datafile:
            if 'Auteursrecht (c) ' in line and copyright_years is None:
                data = line.split()
                copyright_years = data[3]
            if '# RelNum=' in line and release_number is None:
                data = line.split('=')
                # e.g. data = ['# RelNum', '01.00.00\n'], remove \n.
                release_number = data[1].rstrip('\n')
            if '# RelDat=' in line and release_date is None:
                data = line.split('=')
                # e.g. data = ['# RelDat', '1970-01-01\n'], remove \n.
                release_date = data[1].rstrip('\n')
            if (release_number is not None
                    and release_date is not None
                    and copyright_years is not None):
                break

    print(f"""{progname} {release_number} ({release_date})

Geschreven door Karel Zimmer <info@karelzimmer.nl>.

Auteursrecht (c) {copyright_years} Karel Zimmer.
GNU Algemene Publieke Licentie <https://www.gnu.org/licenses/gpl.html>.""")
else:
    lower = 'abcdefghijklmnopqrstuvwxyz'
    upper = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
    numbers = '0123456789'
    symbols = '[]{}()*;/,_-'

    all = lower + upper + numbers + symbols

    length = 16

    password = ''.join(random.sample(all, length))
    print(password)

# Een non-gui script gestart met optie gui.
if args.gui:
    input('Druk op de Enter-toets om verder te gaan [Enter]: ')

# EOF