import asyncio
import requests
from requests.exceptions import ConnectionError, Timeout, SSLError

_session = requests.Session()


async def fetch_weather(api_url, timeout=10, max_retries=3):
    """Получить данные о погоде с retry."""
    for attempt in range(max_retries):
        try:
            response = await asyncio.to_thread(_session.get, api_url, timeout=timeout)
            response.raise_for_status()
            return response.json()
        except (SSLError, ConnectionError, Timeout):
            if attempt < max_retries - 1:
                delay = 2 ** attempt
                print(f"Попытка {attempt + 1} не удалась. Повтор через {delay} сек...")
                await asyncio.sleep(delay)
                continue
            break
        except requests.RequestException as e:
            print(f"Ошибка при получении данных: {e}")
            break

    # Fallback: Open-Meteo API (без ключа, HTTPS)
    return await fetch_open_meteo()


async def fetch_open_meteo(lat=53.4069, lon=58.9797, timeout=10, max_retries=3):
    """Fallback на Open-Meteo API."""
    url = (
        f"https://api.open-meteo.com/v1/forecast?"
        f"latitude={lat}&longitude={lon}&current=temperature,"
        f"apparent_temperature,weather_code,wind_speed_10m,"
        f"relative_humidity_2m,pressure_msl&timezone=Asia/Chelyabinsk"
    )
    for attempt in range(max_retries):
        try:
            response = await asyncio.to_thread(_session.get, url, timeout=timeout)
            response.raise_for_status()
            data = response.json()
            current = data.get("current", {})
            # weather_code WMO код -> перевод (https://open-meteo.com/en/docs)
            weather_code = current.get("weather_code", None)
            desc = wmo_to_russian(weather_code)
            return {
                "current_condition": [{
                    "temp_C": current.get("temperature", "—"),
                    "FeelsLikeC": current.get("apparent_temperature", "—"),
                    "weatherDesc": [{"value": desc}],
                    "humidity": current.get("relative_humidity_2m", "—"),
                    "windspeedKmph": current.get("wind_speed_10m", "—"),
                    "pressure": current.get("pressure_msl", "—"),
                }]
            }
        except (SSLError, ConnectionError, Timeout):
            if attempt < max_retries - 1:
                delay = 2 ** attempt
                print(f"Попытка {attempt + 1} не удалась. Повтор через {delay} сек...")
                await asyncio.sleep(delay)
                continue
            break
        except requests.RequestException as e:
            print(f"Ошибка при получении данных: {e}")
            return None

    return None


def wmo_to_russian(code):
    """Перевод WMO weather code в русский."""
    mapping = {
        0: "Ясно",
        1: "Ясно", 2: "Переменная облачность",
        3: "Пасмурно",
        45: "Туман", 48: "Туман",
        51: "Лёгкая морось", 53: "Морось", 55: "Сильная морось",
        56: "Ледяная морось", 57: "Сильная ледяная морось",
        61: "Небольшой дождь", 63: "Дождь", 65: "Сильный дождь",
        66: "Ледяной дождь", 67: "Сильный ледяной дождь",
        71: "Небольшой снег", 73: "Снег", 75: "Сильный снег",
        77: "Снежная крупа",
        80: "Небольшой ливень", 81: "Ливень", 82: "Сильный ливень",
        85: "Снежный ливень", 86: "Сильный снежный ливень",
        95: "Гроза", 96: "Гроза с градом", 99: "Сильная гроза с градом",
    }
    return mapping.get(code, "Неизвестно")


def translate_weather(en):
    if not en:
        return "—"
    mapping = {
        "Moderate or heavy freezing rain in area": "Ледяной дождь",
        "Moderate or heavy sleet in area": "Слякоть",
        "Moderate or heavy snow in area": "Снег",
        "Moderate or heavy rain in area": "Дождь",
        "Thundery outbreaks in nearby": "Гроза вблизи",
        "Patchy rain nearby": "Местами дождь",
        "Patchy snow nearby": "Местами снег",
        "Patchy sleet nearby": "Местами слякоть",
        "Heavy freezing rain": "Сильный ледяной дождь",
        "Heavy snow": "Сильный снег",
        "Heavy rain": "Сильный дождь",
        "Moderate or heavy rain at times": "Дождь",
        "Moderate or heavy snow at times": "Снег",
        "Blowing snow": "Метель",
        "Patchy light drizzle": "Местами лёгкая морось",
        "Moderate or heavy freezing rain at a distance": "Ледяной дождь",
        "Moderate or heavy sleet at a distance": "Слякоть",
        "Light rain shower": "Небольшой дождь",
        "Heavy rain shower": "Сильный дождь",
        "Moderate rain": "Умеренный дождь",
        "Light rain": "Небольшой дождь",
        "Moderate rain at times": "Умеренный дождь",
        "Heavy rain at times": "Сильный дождь",
        "Light snow": "Небольшой снег",
        "Moderate snow": "Умеренный снег",
        "Patchy light snow": "Местами лёгкий снег",
        "Partly cloudy": "Переменная облачность",
        "Moderate or light sleet": "Слякоть",
        "Light freezing rain": "Лёгкий ледяной дождь",
        "Foggy": "Туманно",
        "Fog": "Туман",
        "Mist": "Туман",
        "Haze": "Дымка",
        "Overcast": "Пасмурно",
        "Cloudy": "Облачно",
        "Clear": "Ясно",
        "Sunny": "Ясно",
    }
    for key, value in mapping.items():
        if key.lower() in en.lower():
            return value
    return en


def pressure_to_mmhg(mb):
    if mb == "—" or not mb:
        return "—"
    try:
        return round(float(mb) * 0.750062, 1)
    except (ValueError, TypeError):
        return "—"