app.py

from flask import Flask, request, jsonify
import requests

app = Flask(__name__)

VERIFY_TOKEN = 'imseldrith'  # Replace with your verification token

@app.route('/', methods=['GET'])
def home():
    return "Welcome to the chatbot!"

@app.route('/facebook', methods=['GET', 'POST'])
def webhook():
    if request.method == 'GET':
        # Webhook verification
        verify_token = request.args.get('hub.verify_token')
        challenge = request.args.get('hub.challenge')

        print(f"GET request received: verify_token={verify_token}, challenge={challenge}")

        if verify_token == VERIFY_TOKEN:
            print("Verification token matches. Returning challenge.")
            return challenge
        else:
            print("Error: wrong validation token.")
            return 'Error, wrong validation token'

    elif request.method == 'POST':
        data = request.get_json()
        print(f"POST request received: {data}")

        if 'entry' in data and len(data['entry']) > 0 and 'messaging' in data['entry'][0]:
            messaging_event = data['entry'][0]['messaging'][0]
            print(f"Messaging event: {messaging_event}")

            if 'message' in messaging_event:
                sender_id = messaging_event['sender']['id']
                message_text = messaging_event['message'].get('text', '')

                print(f"Received message from {sender_id}: {message_text}")

                if message_text.lower() == 'hi':
                    response_text = 'hello'
                    print(f"Sending response to {sender_id}: {response_text}")
                    send_message(sender_id, response_text)
                else:
                    print(f"No action taken for message: {message_text}")

        return jsonify({'status': 'ok'})

def send_message(recipient_id, message_text):
    access_token = 'YOUR_PAGE_ACCESS_TOKEN'  # Replace with your Facebook Page Access Token
    url = f'https://graph.facebook.com/v12.0/me/messages?access_token={access_token}'
    headers = {'Content-Type': 'application/json'}
    payload = {
        'recipient': {'id': recipient_id},
        'message': {'text': message_text}
    }
    print(f"Sending message request: {payload}")
    response = requests.post(url, headers=headers, json=payload)
    print(f"Message send response: {response.status_code}, {response.text}")

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