"""Celery task: refresh mv_quarter_price_per_m2 → mv_quarter_price_index chain.

Scheduled via hardcoded beat entry in workers/beat_schedule.py:
  'refresh-quarter-price-index' — monthly on the 5th at 05:00 MSK (02:00 UTC).
  Runs after 'refresh-ekb-districts-medians' (04:00 MSK same day) so that
  deals data is settled before the price index is recomputed.

Issue: #762.
"""

from __future__ import annotations

import logging
from typing import Any

from app.core.db import SessionLocal
from app.services.site_finder.quarter_price_index_refresh import refresh_quarter_price_index
from app.workers.celery_app import celery_app

logger = logging.getLogger(__name__)


@celery_app.task(
    bind=True,
    name="tasks.refresh_quarter_price_index.refresh_quarter_price_index_chain",
    max_retries=2,
)
def refresh_quarter_price_index_chain(self: Any) -> dict[str, Any]:
    """Refresh mv_quarter_price_per_m2 then mv_quarter_price_index in sequence.

    Both MVs are refreshed CONCURRENTLY (non-blocking). Falls back to
    non-concurrent if the MV is found unpopulated (edge case on first run).

    Returns result dict for Celery task result store / logging.
    """
    db = SessionLocal()
    try:
        count = refresh_quarter_price_index(db, concurrently=True)
        logger.info("refresh_quarter_price_index_chain: completed, index rows=%d", count)
        return {"status": "ok", "mv_quarter_price_index_rows": count}
    except Exception as e:
        logger.exception("refresh_quarter_price_index_chain failed: %s", e)
        raise
    finally:
        db.close()