import io
from typing import Iterator, Self, Type

import pydantic


class _Account(pydantic.BaseModel):
    name: str
    login: str
    password: str

    @classmethod
    def from_tuple(cls: Type[Self], tuple_: tuple[str, str, str]) -> Self:
        return cls(name=tuple_[0], login=tuple_[1], password=tuple_[2])

    def as_tuple(self: Self) -> tuple[str, str, str]:
        return (self.name, self.login, self.password)


class _Accounts(pydantic.BaseModel):
    accounts: list[_Account] = pydantic.Field(default_factory=list)


def _accounts_list_to_json(accounts: Iterator[tuple[str, str, str]]) -> str:
    accounts = _Accounts(accounts=[_Account.from_tuple(i) for i in accounts])
    return accounts.json()


def json_to_accounts(json_: str) -> list[tuple[str, str, str]]:
    accounts = _Accounts.parse_raw(json_)
    return [i.as_tuple() for i in accounts.accounts]


def accounts_to_json(accounts: Iterator[tuple[str, str, str]]) -> io.StringIO:
    file = io.StringIO(_accounts_list_to_json(accounts))
    file.name = "passwords.json"
    return file