import ipaddress
import os

import pytest
import requests
from django.contrib.auth import get_user_model
from django.core.exceptions import ValidationError
from django.core.management import call_command
from django.test import RequestFactory, override_settings

from peeringdb_server.context import current_request
from peeringdb_server.models import (
    Facility,
    InternetExchange,
    IXLan,
    IXLanPrefix,
    Network,
    NetworkContact,
    NetworkIXLan,
    Organization,
    ProtectedAction,
)
from peeringdb_server.validators import (
    validate_address_space,
    validate_info_prefixes4,
    validate_info_prefixes6,
    validate_irr_as_set,
    validate_phonenumber,
    validate_prefix_overlap,
)

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(str(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)
    assert validate_info_prefixes4(None) == 0
    assert validate_info_prefixes4("") == 0


@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)
    assert validate_info_prefixes6(None) == 0
    assert validate_info_prefixes6("") == 0


@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("37.77.32.0/20")
    with pytest.raises(ValidationError):
        validate_address_space("131.72.77.240/28")
    with pytest.raises(ValidationError):
        validate_address_space("2403:c240::/32")
    with pytest.raises(ValidationError):
        validate_address_space("2001:504:0:2::/64")


@pytest.mark.django_db
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 = ix.ixlan

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

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


@pytest.mark.parametrize(
    "value,validated",
    [
        # success validation
        ("RIPE::AS-FOO", "RIPE::AS-FOO"),
        ("AS-FOO@RIPE", "AS-FOO@RIPE"),
        ("AS-FOO-BAR@RIPE", "AS-FOO-BAR@RIPE"),
        ("ripe::as-foo", "RIPE::AS-FOO"),
        ("as-foo@ripe", "AS-FOO@RIPE"),
        ("as-foo@ripe as-bar@ripe", "AS-FOO@RIPE AS-BAR@RIPE"),
        ("as-foo@ripe,as-bar@ripe", "AS-FOO@RIPE AS-BAR@RIPE"),
        ("as-foo@ripe, as-bar@ripe", "AS-FOO@RIPE AS-BAR@RIPE"),
        (
            "RIPE::AS12345:AS-FOO RIPE::AS12345:AS-FOO:AS9876",
            "RIPE::AS12345:AS-FOO RIPE::AS12345:AS-FOO:AS9876",
        ),
        ("ripe::as-foo:as123:as345", "RIPE::AS-FOO:AS123:AS345"),
        ("RIPE::AS12345", "RIPE::AS12345"),
        ("AS12345@RIPE", "AS12345@RIPE"),
        ("RIPE::AS123456:RS-FOO", "RIPE::AS123456:RS-FOO"),
        ("as-foo", "AS-FOO"),
        ("rs-foo", "RS-FOO"),
        ("as-foo as-bar", "AS-FOO AS-BAR"),
        ("rs-foo as-bar", "RS-FOO AS-BAR"),
        ("rs-foo rs-bar", "RS-FOO RS-BAR"),
        ("AS15562", "AS15562"),
        ("AS-15562", "AS-15562"),
        ("AS15562 AS33333", "AS15562 AS33333"),
        # hyphenated source validation
        ("AS-20C@ARIN-NONAUTH", "AS-20C@ARIN-NONAUTH"),
        ("ARIN-NONAUTH::AS-20C", "ARIN-NONAUTH::AS-20C"),
        # fail validation
        ("UNKNOWN::AS-FOO", False),
        ("AS-FOO@UNKNOWN", False),
        ("ASFOO@UNKNOWN", False),
        ("UNKNOWN::ASFOO", False),
        ("RIPE:AS-FOO", False),
        ("RIPE::RS15562:RS-FOO", False),
        ("RIPE::AS123456:RS-FOO:AS-FOO", False),
        ('!"*([])?.=+/\\', False),
        ('RIPE::!"*([])?.=+/\\', False),
        ('!"*([])?.=+/\\@RIPE', False),
        # > DATA_QUALITY_MAX_IRR_DEPTH
        ("ripe::as-foo:as123:as345:as678", False),
    ],
)
def test_validate_irr_as_set(value, validated):
    if not validated:
        with pytest.raises(ValidationError):
            validate_irr_as_set(value)
    else:
        assert validate_irr_as_set(value) == validated


@pytest.mark.django_db
def test_validate_phonenumber():

    # test standalone validator

    validate_phonenumber("+1 206 555 0199")
    validate_phonenumber("012065550199", "US")

    with pytest.raises(ValidationError):
        validate_phonenumber("invalid number")

    with pytest.raises(ValidationError):
        validate_phonenumber("012065550199")

    # test model field validation

    org = Organization.objects.create(name="Test org", status="ok")
    ix = InternetExchange.objects.create(
        name="Text exchange",
        status="ok",
        org=org,
        country="US",
        city="Some city",
        region_continent="North America",
        media="Ethernet",
    )
    net = Network.objects.create(name="Text network", asn=12345, status="ok", org=org)
    poc = NetworkContact.objects.create(network=net, status="ok", role="Abuse")

    # test poc phone validation

    with pytest.raises(ValidationError):
        poc.phone = "invalid"
        poc.full_clean()

    poc.phone = "+1 206 555 0199"
    poc.full_clean()

    # test ix phone validation

    with pytest.raises(ValidationError):
        ix.tech_phone = "invalid"
        ix.full_clean()

    ix.tech_phone = "+1 206 555 0199"
    ix.full_clean()

    with pytest.raises(ValidationError):
        ix.policy_phone = "invalid"
        ix.full_clean()

    ix.policy_phone = "+1 206 555 0199"
    ix.full_clean()


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

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

    with pytest.raises(ValidationError) as exc1:
        pfx.clean()

    assert (
        exc1.value.args[0]
        == "IXLanPrefix with status 'ok' cannot be linked to a IXLan with status 'pending'."
    )

    ixlan.status = "deleted"
    ixlan.save()
    pfx.status = "pending"
    pfx.save()

    with pytest.raises(ValidationError) as exc2:
        pfx.clean()

    assert (
        exc2.value.args[0]
        == "IXLanPrefix with status 'pending' cannot be linked to a IXLan with status 'deleted'."
    )


@pytest.mark.django_db
@override_settings(
    DATA_QUALITY_MAX_PREFIX_V4_LIMIT=500000,
    DATA_QUALITY_MAX_PREFIX_V6_LIMIT=500000,
    DATA_QUALITY_MIN_PREFIXLEN_V4=24,
    DATA_QUALITY_MAX_PREFIXLEN_V4=24,
    DATA_QUALITY_MIN_PREFIXLEN_V6=48,
    DATA_QUALITY_MAX_PREFIXLEN_V6=48,
    DATA_QUALITY_MAX_IRR_DEPTH=3,
    DATA_QUALITY_MIN_SPEED=10,
    DATA_QUALITY_MAX_SPEED=100,
)
def test_bypass_validation():

    User = get_user_model()

    superuser = User.objects.create_user(
        username="superuser",
        password="superuser",
        email="su@localhost",
        is_superuser=True,
    )
    user = User.objects.create_user(
        username="user", password="user", email="user@localhost"
    )

    factory = RequestFactory()

    org = Organization.objects.create(name="Test org", status="ok")
    ix = InternetExchange.objects.create(
        name="Text exchange",
        status="ok",
        org=org,
        country="US",
        city="Some city",
        region_continent="North America",
        media="Ethernet",
    )
    net = Network.objects.create(name="Text network", asn=12345, status="ok", org=org)

    # super user should bypass validation

    request = factory.get("/")
    request.user = superuser
    with current_request(request):
        validate_address_space("37.77.32.0/20")
        validate_address_space("131.72.77.240/28")
        validate_address_space("2403:c240::/32")
        validate_address_space("2001:504:0:2::/64")
        validate_info_prefixes4(500001)
        validate_info_prefixes6(500001)
        NetworkIXLan(speed=1, network=net, ixlan=ix.ixlan).clean()
        NetworkIXLan(speed=1000, network=net, ixlan=ix.ixlan).clean()
        validate_irr_as_set("ripe::as-foo:as123:as345:as678")

    # user should NOT bypass validation

    request = factory.get("/")
    request.user = user
    with current_request(request):
        with pytest.raises(ValidationError):
            validate_address_space("37.77.32.0/20")
        with pytest.raises(ValidationError):
            validate_address_space("131.72.77.240/28")
        with pytest.raises(ValidationError):
            validate_address_space("2403:c240::/32")
        with pytest.raises(ValidationError):
            validate_address_space("2001:504:0:2::/64")
        with pytest.raises(ValidationError):
            validate_info_prefixes4(500001)
        with pytest.raises(ValidationError):
            validate_info_prefixes6(500001)
        with pytest.raises(ValidationError):
            NetworkIXLan(speed=1, network=net, ixlan=ix.ixlan).clean()
        with pytest.raises(ValidationError):
            NetworkIXLan(speed=1000, network=net, ixlan=ix.ixlan).clean()
        with pytest.raises(ValidationError):
            validate_irr_as_set("ripe::as-foo:as123:as345:as678")