"""Command-line interface for hello-hut."""

import argparse
import sys

from . import __version__
from .greetings import DEFAULT_NAME, greet


def build_parser():
    parser = argparse.ArgumentParser(
        prog="hello-hut",
        description="A friendly greeting tool for your terminal.",
    )
    parser.add_argument("name", nargs="?", help="who to greet")
    parser.add_argument("--shout", action="store_true",
                        help="print the greeting in capitals")
    parser.add_argument("--version", action="version",
                        version=f"%(prog)s {__version__}")
    return parser


def main(argv=None):
    args = build_parser().parse_args(argv)
    name = args.name or DEFAULT_NAME
    shout = args.shout

    message = greet(name, shout=shout)
    print(message)
    return 0