import json
import hmac
import hashlib
from http.server import BaseHTTPRequestHandler, HTTPServer
import logging

# Configure logging
logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(levelname)s - %(message)s')
logger = logging.getLogger(__name__)

# Webhook secret for verification (set this when creating the webhook)
WEBHOOK_SECRET = "your-base64-encoded-secret"  # Replace with your secret

class WebhookHandler(BaseHTTPRequestHandler):
    def do_POST(self):
        try:
            # Read the request body
            content_length = int(self.headers['Content-Length'])
            post_data = self.rfile.read(content_length).decode('utf-8')
            payload = json.loads(post_data)

            # Verify webhook signature
            signature = self.headers.get('X-Daily-Signature')
            if not self.verify_signature(post_data, signature):
                logger.warning("Invalid webhook signature")
                self.send_response(401)
                self.end_headers()
                return

            # Handle Daily.co dial-in events
            event_type = payload.get('event')
            if event_type in ['dialin.connected', 'dialin.stopped']:
                logger.info(f"Received {event_type} event: {json.dumps(payload, indent=2)}")
                
                # Example: Process dial-in event
                if event_type == 'dialin.connected':
                    call_id = payload.get('callId')
                    caller = payload.get('From')
                    logger.info(f"Dial-in connected: Call ID {call_id} from {caller}")
                    # Trigger bot startup (e.g., call /start endpoint)
                    self.handle_dialin_connected(payload)
                elif event_type == 'dialin.stopped':
                    call_id = payload.get('callId')
                    logger.info(f"Dial-in stopped: Call ID {call_id}")

                # Send 200 OK response
                self.send_response(200)
                self.send_header('Content-type', 'application/json')
                self.end_headers()
                self.wfile.write(b'{"status": "Event received"}')
            else:
                logger.info(f"Ignored event type: {event_type}")
                self.send_response(200)
                self.end_headers()

        except Exception as e:
            logger.error(f"Error processing webhook: {str(e)}")
            self.send_response(500)
            self.end_headers()

    def verify_signature(self, payload, signature):
        """Verify the webhook signature using HMAC-SHA256."""
        if not signature or not WEBHOOK_SECRET:
            return False
        computed = hmac.new(
            WEBHOOK_SECRET.encode('utf-8'),
            payload.encode('utf-8'),
            hashlib.sha256
        ).hexdigest()
        return hmac.compare_digest(computed, signature)

    def handle_dialin_connected(self, payload):
        """Handle dialin.connected event (e.g., trigger bot startup)."""
        # Example: Send payload to /start endpoint (modify URL as needed)
        import requests
        start_url = "https://<your-space>.hf.space/start"  # Replace with your endpoint
        try:
            response = requests.post(start_url, json=payload, timeout=5)
            logger.info(f"Sent to /start: {response.status_code} - {response.text}")
        except requests.RequestException as e:
            logger.error(f"Failed to send to /start: {str(e)}")

def run(server_class=HTTPServer, handler_class=WebhookHandler, port=8000):
    server_address = ('', port)
    httpd = server_class(server_address, handler_class)
    logger.info(f"Starting webhook server on port {port}...")
    httpd.serve_forever()

if __name__ == '__main__':
    run()