"""Scheduler APScheduler — 3 jobs de collecte météo."""
import logging
from datetime import datetime

from apscheduler.schedulers.asyncio import AsyncIOScheduler

logger = logging.getLogger(__name__)

scheduler = AsyncIOScheduler(timezone="Europe/Paris")


def _store_station_current() -> None:
    """Collecte et stocke les données actuelles de la station."""
    from app.services.station import fetch_current
    from app.models.meteo import MeteoStation
    from app.database import engine
    from sqlmodel import Session

    data = fetch_current()
    if not data:
        logger.warning("Station current: aucune donnée collectée")
        return

    now_str = datetime.now().strftime("%Y-%m-%dT%H:00")
    entry = MeteoStation(date_heure=now_str, type="current", **data)

    with Session(engine) as session:
        existing = session.get(MeteoStation, now_str)
        if existing:
            for k, v in data.items():
                setattr(existing, k, v)
            session.add(existing)
        else:
            session.add(entry)
        session.commit()
    logger.info(f"Station current stockée : {now_str}")


def _store_station_veille() -> None:
    """Collecte et stocke le résumé de la veille (NOAA)."""
    from datetime import timedelta
    from app.services.station import fetch_yesterday_summary
    from app.models.meteo import MeteoStation
    from app.database import engine
    from sqlmodel import Session

    data = fetch_yesterday_summary()
    if not data:
        logger.warning("Station veille: aucune donnée collectée")
        return

    yesterday = (datetime.now() - timedelta(days=1)).strftime("%Y-%m-%dT00:00")
    entry = MeteoStation(date_heure=yesterday, type="veille", **data)

    with Session(engine) as session:
        existing = session.get(MeteoStation, yesterday)
        if existing:
            for k, v in data.items():
                setattr(existing, k, v)
            session.add(existing)
        else:
            session.add(entry)
        session.commit()
    logger.info(f"Station veille stockée : {yesterday}")


def _store_open_meteo() -> None:
    """Collecte et stocke les prévisions Open-Meteo."""
    from app.services.meteo import fetch_and_store_forecast
    from app.models.meteo import MeteoOpenMeteo
    from app.database import engine
    from sqlmodel import Session

    rows = fetch_and_store_forecast()
    if not rows:
        logger.warning("Open-Meteo: aucune donnée collectée")
        return

    with Session(engine) as session:
        for row in rows:
            existing = session.get(MeteoOpenMeteo, row["date"])
            if existing:
                for k, v in row.items():
                    if k != "date":
                        setattr(existing, k, v)
                session.add(existing)
            else:
                session.add(MeteoOpenMeteo(**row))
        session.commit()
    logger.info(f"Open-Meteo stocké : {len(rows)} jours")


def backfill_station_missing_dates(max_days_back: int = 365) -> None:
    """Remplit les dates manquantes de la station météo au démarrage.

    Cherche toutes les dates sans entrée « veille » dans meteostation
    depuis max_days_back jours en arrière jusqu'à hier (excl. aujourd'hui),
    puis télécharge les fichiers NOAA mois par mois pour remplir les trous.
    Un seul appel HTTP par mois manquant.
    """
    from datetime import date, timedelta
    from itertools import groupby
    from app.services.station import fetch_month_summaries
    from app.models.meteo import MeteoStation
    from app.database import engine
    from sqlmodel import Session, select

    today = date.today()
    start_date = today - timedelta(days=max_days_back)

    # 1. Dates « veille » déjà présentes en BDD
    with Session(engine) as session:
        rows = session.exec(
            select(MeteoStation.date_heure).where(MeteoStation.type == "veille")
        ).all()
    existing_dates: set[str] = {dh[:10] for dh in rows}

    # 2. Dates manquantes entre start_date et hier (aujourd'hui exclu)
    missing: list[date] = []
    cursor = start_date
    while cursor < today:
        if cursor.isoformat() not in existing_dates:
            missing.append(cursor)
        cursor += timedelta(days=1)

    if not missing:
        logger.info("Backfill station : aucune date manquante")
        return

    logger.info(f"Backfill station : {len(missing)} date(s) manquante(s) à récupérer")

    # 3. Grouper par (année, mois) → 1 requête HTTP par mois
    def month_key(d: date) -> tuple[int, int]:
        return (d.year, d.month)

    filled = 0
    for (year, month), group_iter in groupby(sorted(missing), key=month_key):
        month_data = fetch_month_summaries(year, month)
        if not month_data:
            logger.debug(f"Backfill station : pas de données NOAA pour {year}-{month:02d}")
            continue

        with Session(engine) as session:
            for d in group_iter:
                data = month_data.get(d.day)
                if not data:
                    continue
                date_heure = f"{d.isoformat()}T00:00"
                if not session.get(MeteoStation, date_heure):
                    session.add(MeteoStation(date_heure=date_heure, type="veille", **data))
                    filled += 1
            session.commit()

    logger.info(f"Backfill station terminé : {filled} date(s) insérée(s)")


def setup_scheduler() -> None:
    """Configure et démarre le scheduler."""
    scheduler.add_job(
        _store_station_current, "interval", hours=1,
        next_run_time=datetime.now(), id="station_current", replace_existing=True,
    )
    scheduler.add_job(
        _store_station_veille, "cron", hour=6, minute=0,
        next_run_time=datetime.now(), id="station_veille", replace_existing=True,
    )
    scheduler.add_job(
        _store_open_meteo, "interval", hours=1,
        next_run_time=datetime.now(), id="open_meteo", replace_existing=True,
    )
    scheduler.start()
    logger.info("Scheduler météo démarré (3 jobs)")