from datetime import datetime
from typing import Tuple


class RegistrationCode:
    def __init__(self,
                 code: str,
                 creation_time: datetime = datetime.now(),
                 expiration_time: datetime = None,
                 usages: int = 0,
                 max_usages: int = 1):
        self.code = code
        self.creation_time = creation_time
        self.expiration_time = expiration_time
        self.usages = usages
        self.max_usages = max_usages

    @staticmethod
    def from_db(db_registration_code: Tuple) -> 'RegistrationCode':
        expiration_time = None if db_registration_code[2] is None else datetime.fromisoformat(db_registration_code[2])
        return RegistrationCode(
            db_registration_code[0],
            datetime.fromisoformat(db_registration_code[1]),
            expiration_time,
            db_registration_code[3],
            db_registration_code[4]
        )

    def is_expired(self):
        return self.expiration_time is not None and self.expiration_time < datetime.now()

    def has_available_uses(self):
        return self.usages < self.max_usages


class RegisteredUser:
    def __init__(self,
                 registration_code: str,
                 username: str,
                 registered_time: datetime = datetime.now()):
        self.registration_code = registration_code
        self.username = username
        self.registered_time = registered_time

    @staticmethod
    def from_db(db_registered_user: Tuple) -> 'RegisteredUser':
        return RegisteredUser(
            db_registered_user[0],
            db_registered_user[1],
            datetime.fromisoformat(db_registered_user[2])
        )