"""Session lifecycle. A session is one sitting (a poker session, or any chat).

For now a session is just an id and a start time; later the poker domain pack
will hang structured data (hands, stacks, villains) off the same id.
"""
from __future__ import annotations

import secrets
from dataclasses import dataclass, field
from datetime import datetime, timezone


def _new_id() -> str:
    return "sess-" + secrets.token_hex(4)


@dataclass
class Session:
    id: str = field(default_factory=_new_id)
    started_at: str = field(default_factory=lambda: datetime.now(timezone.utc).isoformat())