import ipaddress
import os
import pytest
import requests

from django.test import override_settings
from django.core.exceptions import ValidationError

from peeringdb_server.validators import (
    validate_address_space, validate_info_prefixes4, validate_info_prefixes6,
    validate_prefix_overlap)

from peeringdb_server.models import (
    Organization,
    InternetExchange,
    IXLan,
    IXLanPrefix)

pytestmark = pytest.mark.django_db

INVALID_ADDRESS_SPACES = [
    '0.0.0.0/1',
    '0.0.0.0/8',
    '10.0.0.0/8',
    '127.0.0.0/8',
    '169.254.0.0/16',
    #FIXME: this fails still
    #'172.0.0.0/11',
    '172.16.0.0/12',
    '192.0.2.0/24',
    '192.168.0.0/16',
    '198.18.0.0/15',
    '198.51.100.0/24',
    '203.0.113.0/24',
    #FIXME: this fails still
    #'224.0.0.0/3',
    '224.0.0.0/4',
    '240.0.0.0/4',
    '100.64.0.0/10',
    '0000::/8',
    '0064:ff9b::/96',
    '0100::/8',
    '0200::/7',
    '0400::/6',
    '0800::/5',
    '1000::/4',
    '2001::/33',
    '2001:0:8000::/33',
    '2001:0002::/48',
    '2001:0003::/32',
    '2001:10::/28',
    '2001:20::/28',
    '2001:db8::/32',
    '2002::/16',
    '3ffe::/16',
    '4000::/2',
    '4000::/3',
    '5f00::/8',
    '6000::/3',
    '8000::/3',
    'a000::/3',
    'c000::/3',
    'e000::/4',
    'f000::/5',
    'f800::/6',
    'fc00::/7',
    'fe80::/10',
    'fec0::/10',
    'ff00::/8'
]


@pytest.fixture(params=INVALID_ADDRESS_SPACES)
def prefix(request):
    return request.param


#@pytest.mark.django_db
def test_validate_address_space(prefix):
    """
    Tests peeringdb_server.validators.validate_address_space
    """
    with pytest.raises(ValidationError) as exc:
        validate_address_space(ipaddress.ip_network(unicode(prefix)))


@override_settings(DATA_QUALITY_MAX_PREFIX_V4_LIMIT=500000)
def test_validate_info_prefixes4():
    """
    Tests peeringdb_server.validators.validate_info_prefixes4
    """
    with pytest.raises(ValidationError):
        validate_info_prefixes4(500001)
    with pytest.raises(ValidationError):
        validate_info_prefixes4(-1)
    validate_info_prefixes4(500000)


@override_settings(DATA_QUALITY_MAX_PREFIX_V6_LIMIT=500000)
def test_validate_info_prefixes6():
    """
    Tests peeringdb_server.validators.validate_info_prefixes6
    """
    with pytest.raises(ValidationError):
        validate_info_prefixes6(500001)
    with pytest.raises(ValidationError):
        validate_info_prefixes6(-1)
    validate_info_prefixes6(500000)


@override_settings(DATA_QUALITY_MIN_PREFIXLEN_V4=24,
                   DATA_QUALITY_MAX_PREFIXLEN_V4=24,
                   DATA_QUALITY_MIN_PREFIXLEN_V6=48,
                   DATA_QUALITY_MAX_PREFIXLEN_V6=48,
                   )
def test_validate_prefixlen():
    """
    Tests prefix length limits
    """
    with pytest.raises(ValidationError):
        validate_address_space(u"37.77.32.0/20")
    with pytest.raises(ValidationError):
        validate_address_space(u"131.72.77.240/28")
    with pytest.raises(ValidationError):
        validate_address_space(u"2403:c240::/32")
    with pytest.raises(ValidationError):
        validate_address_space(u"2001:504:0:2::/64")

@pytest.mark.djangodb
def test_validate_prefix_overlap():
    org = Organization.objects.create(name="Test org",status="ok")
    ix = InternetExchange.objects.create(name="Text exchange",status="ok",org=org)
    ixlan = IXLan.objects.create(ix=ix, status="ok")

    pfx1 = IXLanPrefix.objects.create(ixlan=ixlan, protocol="IPv4",
                                      prefix=ipaddress.ip_network(u"198.32.125.0/24"),
                                      status="ok")

    with pytest.raises(ValidationError) as exc:
        validate_prefix_overlap(u"198.32.124.0/23")