#!/bin/env python
"""
Example of using the argument parser to create a simple hello program.
- Author: Casey Walker
- License: MIT
Assuming this file is named `say-hello` and has execution permissions, it can be
used like any normal command line tool:
>>> say-hello Mary Poppins
Hello, Mary Poppins!
"""
import sys
from cliclops.parse import Arg_parser, Floating_spec, Positional_spec
def main() -> int:
    help = Floating_spec("h?", "help", desc="Show the help message.")
    first_name = Positional_spec(
        "first-name", num_args=1, desc="The person's first name."
    )
    last_name = Positional_spec(
        "last-name", is_unbounded=True, desc="The person's last name."
    )
    ap = Arg_parser(
        [help, first_name, last_name],
        progname="say-hello",
        short_prefixes="-",
        long_prefixes="--",
    )
    usage = f"""{ap.progname} [-h -? --help] <NAME> [<NAME>]"""
    (invokename, *parsed_args) = ap.parse()
    name: list[str] = []
    for parsed_arg in parsed_args:
        spec = parsed_arg.spec
        if spec == help:
            print(usage)
            return 0
        elif spec in [first_name, last_name]:
            name += parsed_arg.values
        else:
            if isinstance(spec, Floating_spec):
                print(
                    f"Unknown floating argument: {parsed_arg.prefix}"
                    f"{parsed_arg.floating_form}"
                )
            else:
                print(f"Unknown positional argument: {parsed_arg.values}")
            print("Use '-h' to see usage.")
            return 1
    if len(name) > 0:
        print(f"Hello, {' '.join(name)}!")
    else:
        print("No one to say hello to.")
        print("Use '-h' to see usage.")
        return 2
    return 0
if __name__ == "__main__":
    sys.exit(main())