"""Météo via Open-Meteo (gratuit, sans clé API)."""
from __future__ import annotations

from dataclasses import dataclass

import httpx

from config import config

API_URL = "https://api.open-meteo.com/v1/forecast"

# Codes WMO -> (libellé court FR, emoji). Suffisant pour un dashboard e-ink.
WMO = {
    0: ("Dégagé", "☀"),
    1: ("Peu nuageux", "🌤"),
    2: ("Nuageux", "⛅"),
    3: ("Couvert", "☁"),
    45: ("Brouillard", "🌫"),
    48: ("Brouillard givrant", "🌫"),
    51: ("Bruine légère", "🌦"),
    53: ("Bruine", "🌦"),
    55: ("Bruine forte", "🌦"),
    61: ("Pluie faible", "🌧"),
    63: ("Pluie", "🌧"),
    65: ("Pluie forte", "🌧"),
    71: ("Neige faible", "🌨"),
    73: ("Neige", "🌨"),
    75: ("Neige forte", "🌨"),
    80: ("Averses", "🌦"),
    81: ("Averses", "🌧"),
    82: ("Fortes averses", "⛈"),
    95: ("Orage", "⛈"),
    96: ("Orage + grêle", "⛈"),
    99: ("Orage + grêle", "⛈"),
}


@dataclass
class Weather:
    ok: bool
    error: str | None = None
    temp: float | None = None
    feels_like: float | None = None
    label: str = ""
    icon: str = ""
    temp_min: float | None = None
    temp_max: float | None = None
    precip_prob: int | None = None


async def fetch_weather() -> Weather:
    params = {
        "latitude": config.weather_lat,
        "longitude": config.weather_lon,
        "current": "temperature_2m,apparent_temperature,weather_code",
        "daily": "temperature_2m_max,temperature_2m_min,precipitation_probability_max",
        "timezone": config.timezone,
        "forecast_days": 1,
    }
    try:
        async with httpx.AsyncClient(timeout=15) as client:
            resp = await client.get(API_URL, params=params)
            resp.raise_for_status()
            data = resp.json()
    except httpx.HTTPError as exc:
        return Weather(ok=False, error=f"réseau: {exc}")

    cur = data.get("current", {})
    daily = data.get("daily", {})
    code = int(cur.get("weather_code", -1))
    label, icon = WMO.get(code, ("—", "·"))

    def _first(key: str):
        vals = daily.get(key) or []
        return vals[0] if vals else None

    return Weather(
        ok=True,
        temp=cur.get("temperature_2m"),
        feels_like=cur.get("apparent_temperature"),
        label=label,
        icon=icon,
        temp_min=_first("temperature_2m_min"),
        temp_max=_first("temperature_2m_max"),
        precip_prob=_first("precipitation_probability_max"),
    )