server.py

from flask import Flask, jsonify, request, send_from_directory
import requests
import os
import datetime
from dotenv import load_dotenv
from flask_cors import CORS, cross_origin

# Load environment variables from .env file
load_dotenv()

app = Flask(__name__)
CORS(app, resources={r"/*": {"origins": ["http://localhost:9000", "https://bain-weather-app-1bb2d43eb419.herokuapp.com"]}})
app.config['API_KEY'] = os.getenv('API_KEY')

# Serve build files
@app.route('/', methods=['GET'])
def serve_react_app():
    return send_from_directory('public', 'index.html')

# Serve bundle.js
@app.route('/bundle.js', methods=['GET', 'OPTIONS'])
def serve_bundle():
    return send_from_directory('dist', 'bundle.js')

# Server weather data
@app.route('/weather', methods=['GET'])
@cross_origin()
def get_weather():
    
    if request.method == 'OPTIONS':
        response = jsonify({'message': 'Preflight request allowed'})
        response.headers.add('Access-Control-Allow-Methods', 'GET')
        response.headers.add('Access-Control-Allow-Headers', 'Content-Type')
        return response
    
    city = request.args.get('city')
    api_key = app.config['API_KEY']

    if not city:
        return jsonify({'error': 'City parameter is required'}), 400

    # Current weather API call
    current_url = f'https://api.openweathermap.org/data/2.5/weather?q={city}&appid={api_key}'
    current_response = requests.get(current_url)

    if current_response.status_code != 200:
        return jsonify({'error': 'Failed to fetch current weather data'}), 500

    current_data = current_response.json()

    # Extract lat and lon from current weather data
    lat = current_data['coord']['lat']
    lon = current_data['coord']['lon']

    # Historical weather API call for the past 5 days
    historical_url = f'https://api.openweathermap.org/data/3.0/onecall/timemachine?lat={lat}&lon={lon}&dt='
    historical_data = []
    for i in range(1, 6):
        timestamp = int((datetime.datetime.utcnow() - datetime.timedelta(days=i)).timestamp())
        historical_response = requests.get(f'{historical_url}{timestamp}&appid={api_key}')
        if historical_response.status_code == 200:
            historical_data.append(historical_response.json())

    return jsonify({'current_weather': current_data, 'historical_weather': historical_data})

# Run app
if __name__ == '__main__':
    # Binds app to the correct port specified by Heroku
    port = int(os.environ.get('PORT', 5001))
    app.run(host='0.0.0.0', port=port, debug=True)