import base64
import json
from typing import Any
import phonenumbers
from phonenumbers import NumberParseException


def is_valid_phone(phone: str, region="RU") -> bool:
    try:
        parsed = phonenumbers.parse(phone, region)
        return phonenumbers.is_valid_number(parsed)
    except NumberParseException:
        return False


def dict_to_b64(payload: dict) -> str:
    json_str = json.dumps(payload, separators=(",", ":"))
    json_bytes = json_str.encode("utf-8")
    b64 = base64.urlsafe_b64encode(json_bytes).decode("ascii")
    return b64.rstrip("=")


def b64_to_dict(payload: str) -> dict["str", Any]:
    padding = "=" * (-len(payload) % 4)
    payload += padding
    json_bytes = base64.urlsafe_b64decode(payload)
    return json.loads(json_bytes.decode("utf-8"))