from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession

from app.config import settings
from app.db.models import RoundConfig


async def get_round_config(session: AsyncSession) -> RoundConfig:
    """Single-row operational config, lazily seeded from settings defaults on
    first use. fee_address starts empty until an operator sets it (admin
    endpoint, stage 10) — payouts must refuse to run until it's set."""
    config = await session.scalar(select(RoundConfig))
    if config is None:
        config = RoundConfig(fee_address="", bet_amount_sats=settings.bet_amount_sats)
        session.add(config)
        await session.flush()
    return config