"""The dhcpd.conf and reverse zones generated from the test_data fixture."""

import pytest
from django.core.management import call_command
from freezegun import freeze_time

from mdb.models import DhcpConfig, Interface, Ip4Subnet, Ip6Subnet
from mdb.services.zone_sync import ZoneSyncService

EXPECTED_DHCPD_CONF = """\
# Autogenerated configuration 2024-01-01 00:00:00
default-lease-time 600;
max-lease-time 7200;
log-facility local7;
ddns-update-style none;

# clients
subnet 10.0.3.0 netmask 255.255.255.0 {
\toption domain-name "edb.technology";
\toption domain-name-servers 158.36.190.194, 158.36.190.199, 8.8.8.8;
\toption routers 158.36.186.1;
\tdeny unknown-clients;
\trange 10.0.3.2 10.0.3.254;
}

host tut {
\thardware ethernet f0:de:f1:58:be:1a;
\tfixed-address tut.edb.technology;
\tfilename "pxelinux.0";
}
"""

SOA_AND_NS = """\
$TTL 3600
@ IN SOA sega.neuf.no. sysadmin.neuf.no. (
\t{serial}\t; serial
\t28800\t; refresh
\t7200\t; retry
\t604800\t; expire
\t86400 )\t; minimum ttl
;
;
@\tIN\tNS\tsega.neuf.no.
@\tIN\tNS\tatari.neuf.no.
;
"""

EXPECTED_IP4_REVERSE = (
    SOA_AND_NS.format(serial=2024010101)
    + "2                   \tIN\tPTR\ttut.edb.technology.\n"
)

EXPECTED_IP6_REVERSE = (
    SOA_AND_NS.format(serial=1)
    + "2.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0\tPTR\ttut.edb.technology.\n"
)


@pytest.fixture
def fixtures(db):
    # Loading the interface bumps the subnet's serial to the frozen day's first.
    with freeze_time("2024-01-01 00:00:00"):
        call_command("loaddata", "test_data", verbosity=0)


@pytest.fixture
def service(tmp_path):
    svc = ZoneSyncService()
    svc.checkzone_dir = str(tmp_path)
    return svc


def body(zone_file):
    """A zone file without its header comments, which name the file and the time."""
    return zone_file[zone_file.index("$TTL") :]


@freeze_time("2024-01-01 00:00:00")
def test_dhcpd_configuration(fixtures):
    assert DhcpConfig.objects.get().dhcpd_configuration() == EXPECTED_DHCPD_CONF


@freeze_time("2024-01-01 00:00:00")
def test_dhcpd_configuration_authoritative(fixtures):
    DhcpConfig.objects.update(authoritative=True)
    conf = DhcpConfig.objects.get().dhcpd_configuration()
    assert conf.splitlines()[1] == "authoritative;"


def test_dhcpd_configuration_leaves_out_non_dhcp_hosts(fixtures):
    Interface.objects.update(dhcp_client=False)
    assert "host tut" not in DhcpConfig.objects.get().dhcpd_configuration()


def test_dhcpd_configuration_without_pxe_filename(fixtures):
    Interface.objects.update(pxe_filename="")
    conf = DhcpConfig.objects.get().dhcpd_configuration()
    assert "host tut {" in conf
    assert "filename" not in conf


def test_dhcpd_configuration_without_dynamic_range(fixtures):
    Ip4Subnet.objects.update(dhcp_dynamic=False)
    assert "range" not in DhcpConfig.objects.get().dhcpd_configuration()


def test_ip4_reverse_zone(fixtures, service):
    zone = Ip4Subnet.objects.get()
    contents = zone.zone_file_contents()
    assert body(contents) == EXPECTED_IP4_REVERSE
    status, output = service.check_zone(zone, contents)
    assert status == 0, output


def test_ip4_reverse_zone_leaves_out_unassigned_addresses(fixtures):
    Interface.objects.update(ip4address=None)
    assert "PTR" not in Ip4Subnet.objects.get().zone_file_contents()


def test_ip6_reverse_zone(fixtures, service):
    zone = Ip6Subnet.objects.get()
    contents = zone.zone_file_contents()
    assert body(contents) == EXPECTED_IP6_REVERSE
    status, output = service.check_zone(zone, contents)
    assert status == 0, output


def test_ip6_reverse_zone_name():
    zone = Ip6Subnet(network="2001:16d8:eeb6:3", netmask=64)
    assert zone.reverse_zone_name == "3.0.0.0.6.b.e.e.8.d.6.1.1.0.0.2.ip6.arpa"