import requests
import logging
from typing import Optional

logger = logging.getLogger(__name__)

def get_public_ip() -> str:
    """
    Detects public IP using external services.
    Falls back to 127.0.0.1 on failure.
    """
    services = [
        "https://api.ipify.org",
        "https://ifconfig.me/ip",
        "https://icanhazip.com",
    ]
    
    for service in services:
        try:
            response = requests.get(service, timeout=3)
            if response.status_code == 200:
                ip = response.text.strip()
                # Basic validation could be added here
                return ip
        except requests.RequestException:
            continue
            
    logger.warning("Could not detect public IP, defaulting to 127.0.0.1")
    return "127.0.0.1"