"""Calculs de temps purs pour le MCP Alfred Autres (Python 3.11+)."""

from datetime import datetime
from os import environ
from zoneinfo import ZoneInfo, ZoneInfoNotFoundError

WEEKDAYS_FR = (
    "lundi", "mardi", "mercredi", "jeudi", "vendredi", "samedi", "dimanche"
)
MONTHS_FR = (
    "janvier", "février", "mars", "avril", "mai", "juin",
    "juillet", "août", "septembre", "octobre", "novembre", "décembre"
)


def get_current_datetime(timezone: str = "") -> dict[str, str | int]:
    """Obtient l'heure réelle de l'horloge système dans un fuseau IANA."""
    selected = timezone.strip() if timezone else environ.get("ALFRED_TIMEZONE", "Europe/Paris")
    try:
        zone = ZoneInfo(selected)
    except (ZoneInfoNotFoundError, ValueError) as exc:
        raise ValueError(f"Fuseau horaire non reconnu : {selected!r}") from exc

    now = datetime.now(zone)
    offset = now.strftime("%z")
    return {
        "iso_datetime": now.isoformat(timespec="seconds"),
        "time_24h": now.strftime("%H:%M:%S"),
        "hour": now.hour,
        "minute": now.minute,
        "date_iso": now.date().isoformat(),
        "weekday_fr": WEEKDAYS_FR[now.weekday()],
        "date_fr": f"{WEEKDAYS_FR[now.weekday()]} {now.day} {MONTHS_FR[now.month - 1]} {now.year}",
        "timezone": selected,
        "utc_offset": (offset[:3] + ":" + offset[3:]) if offset else "",
        "timestamp_unix": int(now.timestamp()),
    }