app.py

from flask import Flask, request, jsonify
import requests
from dotenv import load_dotenv
import os
import re
import json
from helper.openai_api import chat_completion  # Ensure this import is correct

# 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')

# Check if environment variables are set
if not all([VERIFY_TOKEN, PAGE_ACCESS_TOKEN, OPENAI_API_KEY]):
    raise EnvironmentError("Some environment variables are missing. Please check your .env file.")

# Debugging: Print the loaded environment variables (remove in production)
print(f"VERIFY_TOKEN: {VERIFY_TOKEN}")
print(f"PAGE_ACCESS_TOKEN: {PAGE_ACCESS_TOKEN}")
print(f"OPENAI_API_KEY: {OPENAI_API_KEY}")

@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:
                # Ignore echo messages
                if messaging_event['message'].get('is_echo'):
                    print("Echo message received. Ignoring.")
                    return jsonify({'status': 'ok'})

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

                if not message_text:
                    print("Empty message text received. Ignoring.")
                    return jsonify({'status': 'ok'})

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

                # Set typing on
                set_typing_on(sender_id)

                try:
                    # Get response with possible image URLs
                    response_data = chat_completion(message_text, sender_id)
                    print("ChatBot Response:\n", response_data)
                    response_data = parse_response(response_data)
                    print("#"*10)
                    print("Parsed Response:\n", response_data)
                    print("#"*10)
                    response_text = response_data.get('msg', '')
                    image_urls = response_data.get('image_urls', [])

                    print(f"ChatBot Response Text: {response_text}")
                    print(f"ChatBot Response Image URLs: {image_urls}")

                    # Send text and/or images
                    if response_text:
                        send_message(sender_id, response_text)
                    if image_urls:
                        for url in image_urls:
                            send_image(sender_id, url)

                except Exception as e:
                    print(f"Exception occurred: {e}")
                    send_message(sender_id, "Sorry, something went wrong. Please try again later.")
                
                # Mark message as seen
                mark_seen(sender_id)
                # Set typing off after responding
                set_typing_off(sender_id)

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

def parse_response(input_string):
    # Regex pattern to find URLs
    url_pattern = re.compile(r'https?://\S+|www\.\S+')
    urls = re.findall(url_pattern, input_string)

    # Clean URLs by removing unwanted characters
    cleaned_urls = [re.sub(r'[(){}"\']', '', url) for url in urls]

    # Extract JSON-like dictionaries from the input string
    json_pattern = re.compile(r'\{.*?\}')
    json_matches = json_pattern.findall(input_string)
    extracted_text = input_string

    for json_str in json_matches:
        try:
            json_data = json.loads(json_str)
            if isinstance(json_data, dict):
                extracted_text = json_data.get('msg', extracted_text)
                image_urls = json_data.get('image_url', [])
                if isinstance(image_urls, str):
                    cleaned_urls.append(re.sub(r'[(){}"\']', '', image_urls))
                elif isinstance(image_urls, list):
                    cleaned_urls.extend([re.sub(r'[(){}"\']', '', url) for url in image_urls])
        except json.JSONDecodeError:
            continue

    # Remove URLs from the extracted text
    text = re.sub(url_pattern, '', extracted_text).strip()

    # Further clean the text from any leftover JSON artifacts and unwanted parts
    text = re.sub(r'[\)\{\}\[\]\"\(\']', '', text).strip()
    text = re.sub(r'msg:', '', text).strip()
    text = re.sub(r'image_url:', '', text).strip()
    text = text.replace('\n', '').strip()
    text = text.replace("  ", " ")
    
    return {
        'msg': text,
        'image_urls': list(set(cleaned_urls))
    }

def send_message(recipient_id, message_text):
    url = f'https://graph.facebook.com/v12.0/me/messages?access_token={PAGE_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}")

def send_image(recipient_id, image_url):
    if not verify_image_url(image_url):
        print("Invalid or inaccessible image URL.")
        return

    url = f'https://graph.facebook.com/v12.0/me/messages?access_token={PAGE_ACCESS_TOKEN}'
    headers = {'Content-Type': 'application/json'}
    payload = {
        'recipient': {'id': recipient_id},
        'message': {
            'attachment': {
                'type': 'image',
                'payload': {
                    'url': image_url,
                    'is_reusable': True
                }
            }
        }
    }
    print(f"Sending image request: {payload}")
    response = requests.post(url, headers=headers, json=payload)
    print(f"Image send response: {response.status_code}, {response.text}")

    if response.status_code != 200:
        print(f"Error sending image: {response.json()}")

def verify_image_url(image_url):
    try:
        response = requests.head(image_url)
        return response.status_code == 200 and 'image' in response.headers['Content-Type']
    except Exception as e:
        print(f"Error verifying image URL: {e}")
        return False

def set_typing_on(recipient_id):
    url = f'https://graph.facebook.com/v12.0/me/messages?access_token={PAGE_ACCESS_TOKEN}'
    headers = {'Content-Type': 'application/json'}
    payload = {
        'recipient': {'id': recipient_id},
        'sender_action': 'typing_on'
    }
    print(f"Sending typing on request: {payload}")
    response = requests.post(url, headers=headers, json=payload)
    print(f"Typing on response: {response.status_code}, {response.text}")

def set_typing_off(recipient_id):
    url = f'https://graph.facebook.com/v12.0/me/messages?access_token={PAGE_ACCESS_TOKEN}'
    headers = {'Content-Type': 'application/json'}
    payload = {
        'recipient': {'id': recipient_id},
        'sender_action': 'typing_off'
    }
    print(f"Sending typing off request: {payload}")
    response = requests.post(url, headers=headers, json=payload)
    print(f"Typing off response: {response.status_code}, {response.text}")

def mark_seen(recipient_id):
    url = f'https://graph.facebook.com/v12.0/me/messages?access_token={PAGE_ACCESS_TOKEN}'
    headers = {'Content-Type': 'application/json'}
    payload = {
        'recipient': {'id': recipient_id},
        'sender_action': 'mark_seen'
    }
    print(f"Sending mark seen request: {payload}")
    response = requests.post(url, headers=headers, json=payload)
    print(f"Mark seen response: {response.status_code}, {response.text}")

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