from __future__ import annotations

import enum


class Gender(enum.StrEnum):
    MALE = "MALE"
    FEMALE = "FEMALE"
    PREFER_NOT_TO_ANSWER = "PREFER_NOT_TO_ANSWER"
    NON_BINARY_OTHER = "NON_BINARY_OTHER"

    @classmethod
    def from_string(cls, value: str | None) -> Gender | None:
        if value is None:
            return None
        if (value := value.upper()) in cls.__members__:
            return cls[value]
        elif value == "Prefer not to answer".upper():
            return cls.PREFER_NOT_TO_ANSWER
        elif value == "Non-binary/Other".upper():
            return cls.NON_BINARY_OTHER
        return None