from flask import Flask, request
import requests

app = Flask(__name__)

# --- CONFIGURATION ---
FB_VERIFY_TOKEN = 'YOUR_FB_VERIFY_TOKEN'
FB_PAGE_ACCESS_TOKEN = 'YOUR_FB_PAGE_ACCESS_TOKEN'
TELEGRAM_BOT_TOKEN = 'YOUR_TELEGRAM_BOT_TOKEN'
TELEGRAM_CHAT_ID = 'YOUR_TELEGRAM_CHAT_ID'

# --- HELPER FUNCTIONS ---
def send_telegram_message(text):
    url = f"https://api.telegram.org/bot{TELEGRAM_BOT_TOKEN}/sendMessage"
    payload = {
        "chat_id": TELEGRAM_CHAT_ID,
        "text": text
    }
    requests.post(url, json=payload)

def send_facebook_message(recipient_id, text):
    url = f"https://graph.facebook.com/v18.0/me/messages?access_token={FB_PAGE_ACCESS_TOKEN}"
    payload = {
        "recipient": {"id": recipient_id},
        "message": {"text": text}
    }
    requests.post(url, json=payload)

# --- WEBHOOK ENDPOINTS ---

# 1. Facebook Webhook
@app.route('/fb-webhook', methods=['GET', 'POST'])
def fb_webhook():
    if request.method == 'GET':
        mode = request.args.get('hub.mode')
        token = request.args.get('hub.verify_token')
        challenge = request.args.get('hub.challenge')
        
        if mode == 'subscribe' and token == FB_VERIFY_TOKEN:
            return challenge, 200
        return 'Verification failed', 403

    if request.method == 'POST':
        data = request.get_json()
        if data.get('object') == 'page':
            for entry in data.get('entry', []):
                for messaging_event in entry.get('messaging', []):
                    sender_id = messaging_event['sender']['id']
                    if 'message' in messaging_event and 'text' in messaging_event['message']:
                        user_text = messaging_event['message']['text']
                        forward_text = f"{sender_id}:{user_text}"
                        send_telegram_message(forward_text)
            return 'EVENT_RECEIVED', 200
    return 'Not Found', 404

# 2. Telegram Webhook
@app.route('/tg-webhook', methods=['POST'])
def tg_webhook():
    data = request.get_json()
    if 'message' in data and 'text' in data['message']:
        tg_text = data['message']['text']
        
        if ':' in tg_text:
            parts = tg_text.split(':', 1)
            recipient_id = parts[0].strip()
            message_to_send = parts[1].strip()
            
            if recipient_id.isdigit():
                send_facebook_message(recipient_id, message_to_send)
                
    return 'OK', 200

# WSGI Application
application = app

if __name__ == '__main__':
    app.run()