import openmeteo_requests
import pandas as pd
import requests_cache
from retry_requests import retry
from geopy.geocoders import Nominatim

def call_openmeteo_current(city: str, variable: str) -> str:
    # Setup the Open-Meteo API client with cache and retry on error
    cache_session = requests_cache.CachedSession('.cache', expire_after = 3600)
    retry_session = retry(cache_session, retries = 5, backoff_factor = 0.2)
    openmeteo = openmeteo_requests.Client(session = retry_session)

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

    lat, lon = get_coordinates(city)
    params = {
        "latitude": lat,
        "longitude": lon,
        "current": variable,
    }
    responses = openmeteo.weather_api(url, params=params)
    response = responses[0]
    current = response.Current()
    variable = current.Variables(0).Value()
    return variable

def get_current_weather(city: str) -> str:
    """Get the summary of the current weather in a city."""
    weather = call_openmeteo_current(city, "weather_code")
    weather_str = weather_code_to_description(weather)
    return weather_str

def get_current_temperature(city: str) -> str:
    """Get the current temperature in a city."""
    temperature = call_openmeteo_current(city, "temperature_2m")
    return str(round(temperature))

def get_current_wind_speed(city: str) -> str:
    """Get the current wind speed (10m) in a city."""
    wind = call_openmeteo_current(city, "wind_speed_10m")
    return str(round(wind)) + " m/s" 

def get_coordinates(city: str):
    geolocator = Nominatim(user_agent="NewApp")
    location = geolocator.geocode(city)
    return location.latitude, location.longitude


def weather_code_to_description(code: float | int) -> str:
    """
    Convert Open-Meteo (WMO) weather codes to human-readable descriptions.
    Accepts int or float values (e.g., 1.0 -> 1).
    """
    code = int(code)

    WEATHER_CODE_MAP = {
        0: "Clear sky",

        1: "Mainly clear",
        2: "Partly cloudy",
        3: "Overcast",

        45: "Fog",
        48: "Depositing rime fog",

        51: "Light drizzle",
        53: "Moderate drizzle",
        55: "Dense drizzle",

        56: "Light freezing drizzle",
        57: "Dense freezing drizzle",

        61: "Slight rain",
        63: "Moderate rain",
        65: "Heavy rain",

        66: "Light freezing rain",
        67: "Heavy freezing rain",

        71: "Slight snowfall",
        73: "Moderate snowfall",
        75: "Heavy snowfall",

        77: "Snow grains",

        80: "Slight rain showers",
        81: "Moderate rain showers",
        82: "Violent rain showers",

        85: "Slight snow showers",
        86: "Heavy snow showers",

        95: "Thunderstorm",
        96: "Thunderstorm with slight hail",
        99: "Thunderstorm with heavy hail",
    }

    return WEATHER_CODE_MAP.get(code, f"Unknown weather code: {code}")