import vobject  # pip install vobject
import argparse
import csv
import sys


def notify_skip(card: vobject.vCard) -> None:
    print(sys.stderr, 'skipped:', card,
          file=sys.stderr)
    pass


def convert(src, dst) -> None:
    # TODO check if src == sys.stdin and it`s empty
    writer = csv.writer(dst)
    writer.writerow(['name', 'email'])
    for card in vobject.readComponents(src):
        if not hasattr(card, 'fn'):
            notify_skip(card)
            continue
        if not hasattr(card, 'email_list'):
            notify_skip(card)
            continue
        writer.writerow([
            card.fn.value.strip().split(' ')[0],
            card.email_list[0].value.strip()
        ])


def new_parser() -> argparse.ArgumentParser:
    parser = argparse.ArgumentParser(
        description='Extract name and email from vcf')
    parser.add_argument('src', nargs='?',
                        type=argparse.FileType('r'), default=sys.stdin,
                        help='source file in vcf format (default stdin)')
    parser.add_argument('dst', nargs='?',
                        type=argparse.FileType('w'), default=sys.stdout,
                        help='result file in csv format (default stdout)')
    return parser


if '__main__' == __name__:
    args = new_parser().parse_args()
    convert(args.src, args.dst)