import subprocess

SERVERS = [
    ("resolver1.opendns.com", "myip.opendns.com"),
    ("resolver2.opendns.com", "myip.opendns.com"),
    ("resolver3.opendns.com", "myip.opendns.com"),
    ("resolver4.opendns.com", "myip.opendns.com"),
    ("ns1-1.akamaitech.net", "whoami.akamai.net"),
]


def get_public_ip():
    for server, host in SERVERS:
        try:
            result = subprocess.run(
                [
                    "dig",
                    "+short",
                    host,
                    f"@{server}",
                ],
                capture_output=True,
                text=True,
                check=True,
                timeout=5,
            )

            ip = result.stdout.strip()

            if ip:
                return ip

        except Exception:
            pass

    raise RuntimeError("cannot determine public IP")