"""Telegram ↔ VoIdea account linking."""

from __future__ import annotations

import secrets
from typing import Any

# In-memory store for link tokens (in production: Redis with TTL)
_link_tokens: dict[str, int] = {}  # token → user_id


def create_link_token(user_id: int) -> str:
    """Generate a one-time token for linking Telegram to VoIdea account."""
    token = secrets.token_urlsafe(32)
    _link_tokens[token] = user_id
    return token


def consume_link_token(token: str) -> int | None:
    """Validate and consume a link token. Returns user_id or None."""
    user_id = _link_tokens.pop(token, None)
    return user_id


def get_bot_link_url(base_url: str, token: str) -> str:
    """Return the URL for the user to confirm account linking."""
    return f"{base_url}/bot/link?token={token}"