import secrets
import time
import uuid

TICKET_TTL_SECONDS = 30

_tickets: dict[str, tuple[uuid.UUID, uuid.UUID, float]] = {}  # ticket -> (game_id, user_id, expires_at)


def issue_ticket(game_id: uuid.UUID, user_id: uuid.UUID) -> str:
    ticket = secrets.token_urlsafe(32)
    _tickets[ticket] = (game_id, user_id, time.monotonic() + TICKET_TTL_SECONDS)
    return ticket


def consume_ticket(ticket: str, game_id: uuid.UUID) -> uuid.UUID | None:
    """Single-use: returns the user_id if the ticket is valid for this game and not expired, else None."""
    entry = _tickets.pop(ticket, None)
    if entry is None:
        return None
    ticket_game_id, user_id, expires_at = entry
    if ticket_game_id != game_id or time.monotonic() > expires_at:
        return None
    return user_id