#!/usr/bin/env python3
import requests
import argparse

# Set a unique User-Agent header (required by the NWS API)
headers = {'User-Agent': 'sandbox_weather_tool ([email protected])'}

def get_coordinates(lat, lon):
    """Retrieve metadata for location to find forecast endpoint URL"""
    points_url = f'https://api.weather.gov/points/{lat},{lon}'
    points_response = requests.get(points_url, headers=headers)
    if points_response.status_code != 200:
        print(f"Error fetching point data: {points_response.status_code}")
        return None
    
    points_data = points_response.json()
    
    # Extract the forecast URL from the response
    forecast_url = points_data['properties']['forecast']
    
    # Retrieve the actual forecast data
    forecast_response = requests.get(forecast_url, headers=headers)
    if forecast_response.status_code != 200:
        print(f"Error fetching forecast: {forecast_response.status_code}")
        return None
    
    forecast_data = forecast_response.json()
    
    # Print the detailed forecast
    print(forecast_data['properties']['periods'][0]['detailedForecast'])

def main():
    parser = argparse.ArgumentParser(
        description='Get weather forecast from NWS API',
        formatter_class=argparse.RawDescriptionHelpFormatter,
        epilog='''
Examples:
  %(prog)s 40.7128 -74.0060   Weather in NYC
  %(prog)s 51.5074 -0.1278    Weather in London
  %(prog)s 35.6762 139.7671   Weather in Tokyo
'''
    )
    parser.add_argument('lat', type=float, help='Latitude')
    parser.add_argument('lon', type=float, help='Longitude')
    
    args = parser.parse_args()
    
    get_coordinates(args.lat, args.lon)

if __name__ == '__main__':
    main()