import datetime
import re

from aiogram.types import User as TelegramUser
from pydantic_core import PydanticCustomError
from pydantic_extra_types.phone_numbers import PhoneNumber


BIRTHDATE_REGEXP = re.compile(r"^(?P<day>\d{2}).(?P<month>\d{2}).(?P<year>\d{4})$")


def parse_date(text: str) -> datetime.date | None:
    if (re_match := BIRTHDATE_REGEXP.match(text)) is None:
        return

    return datetime.date(
        year=int(re_match.group("year")),
        month=int(re_match.group("month")),
        day=int(re_match.group("day")),
    )


def parse_phone(text: str) -> str | None:
    phone = text
    if not phone.startswith("+"):
        phone = f"+{phone}"
    try:
        PhoneNumber._validate(phone, None)
    except PydanticCustomError:
        return

    return phone


def get_telegram_user_full_name(user: TelegramUser) -> str:
    name_parts = (user.first_name, user.last_name)
    return " ".join(filter(None, name_parts))