import ipaddress
import socket
from urllib.parse import urlparse
import requests


def validate_notification_url(url: str):
    parsed = urlparse(url or "")
    if parsed.scheme not in {"http", "https"} or not parsed.hostname or parsed.username or parsed.password:
        raise ValueError("Adres ntfy musi być adresem HTTP(S) bez danych logowania")
    try:
        addresses = {info[4][0] for info in socket.getaddrinfo(parsed.hostname, parsed.port, type=socket.SOCK_STREAM)}
        if any(ipaddress.ip_address(address).is_private or ipaddress.ip_address(address).is_loopback or
               ipaddress.ip_address(address).is_link_local for address in addresses):
            raise ValueError("Adres ntfy wskazuje na prywatną lub lokalną sieć")
    except socket.gaierror as exc:
        raise ValueError("Nie można rozpoznać hosta ntfy") from exc

def send_notification(url: str, topic: str, title: str, message: str, username: str = None, password: str = None):
    if not url or not topic:
        return False
    validate_notification_url(url)
        
    full_url = f"{url.rstrip('/')}/{topic}"
    headers = {
        "Title": title.encode('utf-8')
    }
    
    auth = None
    if username and password:
        auth = (username, password)
        
    try:
        response = requests.post(
            full_url,
            data=message.encode('utf-8'),
            headers=headers,
            auth=auth,
            timeout=5
        )
        response.raise_for_status()
        return True
    except Exception as e:
        print(f"Failed to send ntfy notification: {e}")
        return False