"""Удаление устаревших events и resolved problems."""

from datetime import datetime, timedelta, timezone

from sqlalchemy import delete
from sqlalchemy.orm import Session

from app.config import Settings
from app.models import Event, Problem


def purge_old_data(db: Session, settings: Settings) -> dict:
    """
    Events: received_at старше sac_events_retention_days.
    Problems: status=resolved и updated_at старше sac_problems_retention_days.
    """
    now = datetime.now(timezone.utc)
    events_cutoff = now - timedelta(days=settings.sac_events_retention_days)
    problems_cutoff = now - timedelta(days=settings.sac_problems_retention_days)

    events_result = db.execute(delete(Event).where(Event.received_at < events_cutoff))
    events_deleted = events_result.rowcount or 0

    problems_result = db.execute(
        delete(Problem).where(
            Problem.status == "resolved",
            Problem.updated_at < problems_cutoff,
        )
    )
    problems_deleted = problems_result.rowcount or 0

    db.commit()

    return {
        "events_deleted": events_deleted,
        "problems_deleted": problems_deleted,
        "events_cutoff": events_cutoff.isoformat(),
        "problems_cutoff": problems_cutoff.isoformat(),
    }