import pytest

from karldns.services.ddns import (
    INITIAL_PLACEHOLDER_IPV4,
    BadIpError,
    UpdateIpParams,
    _initial_dns_plan,
    _required_ip_param,
)


def test_update_ip_params_expose_initial_plan_arguments() -> None:
    params = UpdateIpParams(myip="203.0.113.9", ipaddr=None, myipv6="2001:db8::9", ip6addr=None)

    assert params.initial_plan_args == ("203.0.113.9", None, "2001:db8::9", None)


def test_required_ip_param_rejects_invalid_or_wrong_version_values() -> None:
    assert _required_ip_param("myip", "203.0.113.77", version=4) == "203.0.113.77"

    with pytest.raises(BadIpError, match="valid IPv4"):
        _required_ip_param("myip", "not-an-ip", version=4)

    with pytest.raises(BadIpError, match="IPv4"):
        _required_ip_param("myip", "2001:db8::1", version=4)


def test_initial_dns_plan_uses_placeholder_without_supplied_or_public_source_ip() -> None:
    plan = _initial_dns_plan(
        source_ip="172.18.0.5",
        myip=None,
        ipaddr=None,
        myipv6=None,
        ip6addr=None,
    )

    assert plan.ipv4 == INITIAL_PLACEHOLDER_IPV4
    assert plan.ipv6 is None
    assert plan.update_ipv4 is True
    assert plan.update_ipv6 is False
    assert plan.detail == "initial placeholder dns registered"


def test_initial_dns_plan_uses_supplied_ip_values() -> None:
    plan = _initial_dns_plan(
        source_ip="172.18.0.5",
        myip="203.0.113.77",
        ipaddr=None,
        myipv6=None,
        ip6addr=None,
    )

    assert plan.ipv4 == "203.0.113.77"
    assert plan.ipv6 is None
    assert plan.update_ipv4 is True
    assert plan.update_ipv6 is False
    assert plan.detail == "initial dns registered"