#!/usr/bin/env python3
# -*- coding: utf-8 -*-

from typing import Self, Optional

class Options:
    
    OVERWRITING:int = 0
    OVERWRITE:int = 1 * 3 ** OVERWRITING
    NO_OVERWRITE:int = 2 * 3 ** OVERWRITING

    NULLISH:int = 1
    ALLOW_NULLS:int = 1 * 3 ** NULLISH
    NOT_NULLS:int = 2 * 3 ** NULLISH

    DEFAULT:Self = Self(NO_OVERWRITE + ALLOW_NULLS)

    @classmethod
    def get_value(cls:type[Self], value:int, option:int) -> bool|None:

        ternary:int = value // 3 ** option % 3

        return (
            True if ternary == 1 else 
            False if ternary == 2 else 
        None)

    def __init__(self:Self, options:int = 0, default:Optional[Self] = None) -> None:

        self.overwrite:bool|None
        self.allow_null:bool|None

        if default is None:
            default = self.DEFAULT

        for key, option in (
            ("overwrite", self.OVERWRITE),
            ("allow_null", self.NULLISH)
        ):
            
            value:bool|None = self.get_value(options, option)
            
            setattr(self, key, getattr(default, key) if value is None and default is not None else value)

    def get(self:Self) -> int:
        
        code:int = 0
        option:int
        value:bool|None

        for option, value in (
            (self.OVERWRITING, self.overwrite), 
            (self.NULLISH, self.allow_null)
        ):
            code += (
                1 if value is True else 
                2 if value is False else
            0) * 3 ** option

        return code