from flask import Flask, request, jsonify
import requests
from dotenv import load_dotenv
import os

# Load environment variables from .env file
load_dotenv()

app = Flask(__name__)

# Retrieve environment variables
VERIFY_TOKEN = os.getenv('VERIFY_TOKEN')
PAGE_ACCESS_TOKEN = os.getenv('PAGE_ACCESS_TOKEN')
OPENAI_API_KEY = os.getenv('OPENAI_API_KEY')

# Define the API endpoint for sending messages
API_URL = f"https://graph.facebook.com/v13.0/me/messages?access_token={PAGE_ACCESS_TOKEN}"

@app.route("/facebook", methods=['GET'])
def fbverify():
    mode = request.args.get("hub.mode")
    token = request.args.get("hub.verify_token")
    challenge = request.args.get("hub.challenge")

    if mode == "subscribe" and challenge:
        if token == VERIFY_TOKEN:
            return challenge, 200
        else:
            return "Verification token mismatch", 403
    return "Hello world", 200

@app.route("/", methods=['POST'])
def fbwebhook():
    data = request.get_json()
    print(data)

    try:
        # Extract the message and sender ID from the request
        messaging_event = data['entry'][0]['messaging'][0]
        message = messaging_event.get('message', {})
        sender_id = messaging_event['sender']['id']

        # Check if the received message is "hi"
        if message.get('text') == "hi":
            request_body = {
                "recipient": {
                    "id": sender_id
                },
                "message": {
                    "text": "Hello, world!"
                }
            }
            response = requests.post(API_URL, json=request_body)
            return jsonify(response.json()), response.status_code

    except KeyError as e:
        print(f"KeyError: {e}")
        return "Invalid payload structure", 400
    except Exception as e:
        print(f"Exception: {e}")
        return "Internal Server Error", 500

if __name__ == '__main__':
    app.run(host="0.0.0.0", port=7860, debug=True)