from datetime import datetime, timezone

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

from app.db.models import PendingTransaction, RoundParticipant
from app.tx.confirmation import register_handler


async def _on_bet_confirmed(session: AsyncSession, pending: PendingTransaction) -> None:
    """Resolved by (round_id, user_id) — the pair is unique per participant and,
    unlike the txid, cannot change under us. Keying this on bet_txid meant an
    RBF-bumped bet confirmed under a txid no participant carried, so the row stayed
    "broadcast" forever and the round could never close (B-02). The txid is kept in
    step by tx/broadcast.py too, but correctness here no longer depends on it."""
    participant = await session.scalar(
        select(RoundParticipant).where(
            RoundParticipant.round_id == pending.round_id,
            RoundParticipant.user_id == pending.user_id,
        )
    )
    if participant is None:
        # Fall back to the txid for rows written before this changed, and for any
        # pending row missing its round/user link.
        participant = await session.scalar(
            select(RoundParticipant).where(RoundParticipant.bet_txid == pending.current_txid)
        )
    if participant is not None and participant.status in ("building", "broadcast"):
        participant.status = "confirmed"
        participant.confirmed_at = datetime.now(timezone.utc)


register_handler("bet", _on_bet_confirmed)