from typing import Optional


def choice(default: str, options: str, msg: str) -> str:
    default = default.lower()
    formatted_options = "".join(
        [(opt + "/" if opt != default else default.upper() + "/") for opt in options]
    )[:-1]
    choice = input(msg + " [" + formatted_options + "] ")
    if choice == "":
        return default
    else:
        return choice.lower()


def confirm(is_true_default: bool, msg: Optional[str] = ""):
    return (
        choice(
            "y" if is_true_default else "n",
            "yn",
            (msg if msg != "" and msg != None else "Do you really want to continue?"),
        )
        == "y"
    )


def confirm_overwrite(msg: Optional[str] = ""):
    return confirm(
        False, (msg if msg != "" else "Do you really want to overwrite your changes?")
    )