"""alert_outbox 원장 접근."""
from sqlalchemy import func, select, update

from common.database.model.models import alert_outbox
from common.enums import AlertStatus
from common.utils.gtime import GTime


async def latest_unresolved(session, dedupe_key: str):
    """이 dedupe_key 로 아직 안 풀린(resolved_at IS NULL) 가장 최근 알림."""
    result = await session.execute(
        select(alert_outbox)
        .where(alert_outbox.dedupe_key == dedupe_key, alert_outbox.deleted.is_(False),
               alert_outbox.resolved_at.is_(None))
        .order_by(alert_outbox.created_at.desc())
        .limit(1)
    )
    return result.scalars().first()


async def insert(session, values: dict) -> alert_outbox:
    row = alert_outbox(**values)
    session.add(row)
    await session.flush()
    return row


async def due_pending(session, limit: int = 20):
    """`next_attempt_at <= func.now()` — **DB 서버의** 지금 시각과 비교한다."""
    result = await session.execute(
        select(alert_outbox)
        .where(alert_outbox.status == AlertStatus.PENDING.value, alert_outbox.deleted.is_(False),
               alert_outbox.next_attempt_at <= func.now())
        .order_by(alert_outbox.next_attempt_at)
        .limit(limit)
    )
    return result.scalars().all()


async def mark_sent(session, alert_id) -> None:
    now = GTime.UTC()
    await session.execute(
        update(alert_outbox).where(alert_outbox.alert_id == alert_id)
        .values(status=AlertStatus.SENT.value, sent_at=now, updated_at=now)
    )


async def mark_retry(session, alert_id, attempts: int, next_attempt_at) -> None:
    await session.execute(
        update(alert_outbox).where(alert_outbox.alert_id == alert_id)
        .values(attempts=attempts, next_attempt_at=next_attempt_at, updated_at=GTime.UTC())
    )


async def mark_exhausted(session, alert_id, attempts: int) -> None:
    """재시도 상한 소진 — 더 시도하지 않는다(사람이 outbox 를 봐야 한다)."""
    await session.execute(
        update(alert_outbox).where(alert_outbox.alert_id == alert_id)
        .values(status=AlertStatus.FAILED.value, attempts=attempts, updated_at=GTime.UTC())
    )


async def mark_resolved(session, alert_id) -> None:
    now = GTime.UTC()
    await session.execute(
        update(alert_outbox).where(alert_outbox.alert_id == alert_id)
        .values(resolved_at=now, updated_at=now)
    )