# val_type_dc.py

import dataclasses
import sys
from typing import List, Any

USAGE = f"Usage: python {sys.argv[0]} [--help] | firstname lastname age]"


@dataclasses.dataclass
class Arguments:
    firstname: str
    lastname: str
    age: int = 0


def check_type(obj):
    for field in dataclasses.fields(obj):
        value = getattr(obj, field.name)
        print(
            f"Value: {value}, "
            f"Expected type {field.type} for {field.name}, "
            f"got {type(value)}"
        )
        if type(value) != field.type:
            print("Type Error")
        else:
            print("Type Ok")


def validate(args: List[str]):
    # If passed to the command line, need to convert
    # the optional 3rd argument from string to int
    if len(args) > 2 and args[2].isdigit():
        args[2] = int(args[2])
    try:
        arguments = Arguments(*args)
    except TypeError:
        raise SystemExit(USAGE)
    check_type(arguments)


def main() -> None:
    args = sys.argv[1:]
    if not args:
        raise SystemExit(USAGE)

    if args[0] == "--help":
        print(USAGE)
    else:
        validate(args)


if __name__ == "__main__":
    main()


# ejecutar
# python3 val_type_dc.py Guido "Van Rossum" 25
# python3 val_type_dc.py Guido "Van Rossum"
# python3 val_type_dc.py Guido Van Rossum