# Copyright (C) 2020 Sebastian Pipping <sebastian@pipping.org>
# Licensed under GPL v3 or later


class Confirmation:
    _CONFIRM_GOOD = ("y", "Y")
    _CONFIRM_BAD = ("", "n", "N")
    _CONFIRM_KNOWN = _CONFIRM_GOOD + _CONFIRM_BAD

    def __init__(self, messenger, ask):
        self._messenger = messenger
        self._ask = ask

    def confirmed(self, question):
        if not self._ask:
            return True

        question = self._messenger.format_question(question)

        self._messenger.produce_air()

        while True:
            reply = input(f"{question} [y/N] ")
            if reply in self._CONFIRM_KNOWN:
                break

        self._messenger.request_air(question)

        return reply in self._CONFIRM_GOOD