src/streamlit_app.py

import os
import requests
import streamlit as st
from dotenv import load_dotenv

def get_weather(city):
    """Fetch weather data from OpenWeatherMap API"""
    load_dotenv()
    api_key = os.getenv('OPENWEATHER_API_KEY')
    
    if not api_key:
        st.error("⚠️ OpenWeather API key not found. Please set OPENWEATHER_API_KEY in your environment variables.")
        return None
    
    base_url = "http://api.openweathermap.org/data/2.5/weather"
    params = {
        'q': city,
        'appid': api_key,
        'units': 'imperial'
    }
    
    try:
        response = requests.get(base_url, params=params)
        response.raise_for_status()
        return response.json()
    except requests.exceptions.RequestException as e:
        st.error(f"Error fetching weather data: {e}")
        return None

def display_weather(weather_data):
    """Display formatted weather information in Streamlit"""
    if not weather_data:
        return
    
    if 'main' not in weather_data:
        st.error("Invalid response from weather API. Please check the city name.")
        return
    
    temp_fahrenheit = weather_data['main']['temp']
    feels_like = weather_data['main']['feels_like']
    humidity = weather_data['main']['humidity']
    description = weather_data['weather'][0]['description'].title()
    
    city_name = weather_data['name']
    country = weather_data['sys']['country']
    
    # Display weather report using Streamlit components
    st.success(f"Weather data retrieved for {city_name}, {country}")
    
    col1, col2, col3 = st.columns(3)
    
    with col1:
        st.metric("🌡️ Temperature", f"{temp_fahrenheit}°F", f"Feels like {feels_like}°F")
    
    with col2:
        st.metric("💧 Humidity", f"{humidity}%")
    
    with col3:
        st.metric("☁️ Condition", description)

def main():
    """Main application function"""
    st.set_page_config(
        page_title="Weather App",
        page_icon="🌤️",
        layout="wide"
    )
    
    st.title("🌤️ Weather CLI App")
    st.markdown("Get current weather information for any city!")
    
    # Create input form
    with st.form("weather_form"):
        city = st.text_input("🏙️ Enter a city name:", placeholder="e.g., London, Tokyo, New York")
        submit_button = st.form_submit_button("Get Weather")
    
    if submit_button and city:
        with st.spinner(f"🔍 Fetching weather data for {city}..."):
            weather_data = get_weather(city.strip())
            display_weather(weather_data)
    elif submit_button and not city:
        st.warning("Please enter a city name!")

if __name__ == "__main__":
    main()