from django import forms
from django.test import TestCase

from ipam.forms import IPAddressCSVForm
from utilities.forms.fields import CSVDataField
from utilities.forms.utils import expand_alphanumeric_pattern, expand_ipaddress_pattern


class ExpandIPAddress(TestCase):
    """
    Validate the operation of expand_ipaddress_pattern().
    """
    def test_ipv4_range(self):
        input = '1.2.3.[9-10]/32'
        output = sorted([
            '1.2.3.9/32',
            '1.2.3.10/32',
        ])

        self.assertEqual(sorted(expand_ipaddress_pattern(input, 4)), output)

    def test_ipv4_set(self):
        input = '1.2.3.[4,44]/32'
        output = sorted([
            '1.2.3.4/32',
            '1.2.3.44/32',
        ])

        self.assertEqual(sorted(expand_ipaddress_pattern(input, 4)), output)

    def test_ipv4_multiple_ranges(self):
        input = '1.[9-10].3.[9-11]/32'
        output = sorted([
            '1.9.3.9/32',
            '1.9.3.10/32',
            '1.9.3.11/32',
            '1.10.3.9/32',
            '1.10.3.10/32',
            '1.10.3.11/32',
        ])

        self.assertEqual(sorted(expand_ipaddress_pattern(input, 4)), output)

    def test_ipv4_multiple_sets(self):
        input = '1.[2,22].3.[4,44]/32'
        output = sorted([
            '1.2.3.4/32',
            '1.2.3.44/32',
            '1.22.3.4/32',
            '1.22.3.44/32',
        ])

        self.assertEqual(sorted(expand_ipaddress_pattern(input, 4)), output)

    def test_ipv4_set_and_range(self):
        input = '1.[2,22].3.[9-11]/32'
        output = sorted([
            '1.2.3.9/32',
            '1.2.3.10/32',
            '1.2.3.11/32',
            '1.22.3.9/32',
            '1.22.3.10/32',
            '1.22.3.11/32',
        ])

        self.assertEqual(sorted(expand_ipaddress_pattern(input, 4)), output)

    def test_ipv6_range(self):
        input = 'fec::abcd:[9-b]/64'
        output = sorted([
            'fec::abcd:9/64',
            'fec::abcd:a/64',
            'fec::abcd:b/64',
        ])

        self.assertEqual(sorted(expand_ipaddress_pattern(input, 6)), output)

    def test_ipv6_range_multichar_field(self):
        input = 'fec::abcd:[f-11]/64'
        output = sorted([
            'fec::abcd:f/64',
            'fec::abcd:10/64',
            'fec::abcd:11/64',
        ])

        self.assertEqual(sorted(expand_ipaddress_pattern(input, 6)), output)

    def test_ipv6_set(self):
        input = 'fec::abcd:[9,ab]/64'
        output = sorted([
            'fec::abcd:9/64',
            'fec::abcd:ab/64',
        ])

        self.assertEqual(sorted(expand_ipaddress_pattern(input, 6)), output)

    def test_ipv6_multiple_ranges(self):
        input = 'fec::[1-2]bcd:[9-b]/64'
        output = sorted([
            'fec::1bcd:9/64',
            'fec::1bcd:a/64',
            'fec::1bcd:b/64',
            'fec::2bcd:9/64',
            'fec::2bcd:a/64',
            'fec::2bcd:b/64',
        ])

        self.assertEqual(sorted(expand_ipaddress_pattern(input, 6)), output)

    def test_ipv6_multiple_sets(self):
        input = 'fec::[a,f]bcd:[9,ab]/64'
        output = sorted([
            'fec::abcd:9/64',
            'fec::abcd:ab/64',
            'fec::fbcd:9/64',
            'fec::fbcd:ab/64',
        ])

        self.assertEqual(sorted(expand_ipaddress_pattern(input, 6)), output)

    def test_ipv6_set_and_range(self):
        input = 'fec::[dead,beaf]:[9-b]/64'
        output = sorted([
            'fec::dead:9/64',
            'fec::dead:a/64',
            'fec::dead:b/64',
            'fec::beaf:9/64',
            'fec::beaf:a/64',
            'fec::beaf:b/64',
        ])

        self.assertEqual(sorted(expand_ipaddress_pattern(input, 6)), output)

    def test_invalid_address_family(self):
        with self.assertRaisesRegex(Exception, 'Invalid IP address family: 5'):
            sorted(expand_ipaddress_pattern(None, 5))

    def test_invalid_non_pattern(self):
        with self.assertRaises(ValueError):
            sorted(expand_ipaddress_pattern('1.2.3.4/32', 4))

    def test_invalid_range(self):
        with self.assertRaises(ValueError):
            sorted(expand_ipaddress_pattern('1.2.3.[4-]/32', 4))

        with self.assertRaises(ValueError):
            sorted(expand_ipaddress_pattern('1.2.3.[-4]/32', 4))

        with self.assertRaises(ValueError):
            sorted(expand_ipaddress_pattern('1.2.3.[4--5]/32', 4))

    def test_invalid_range_bounds(self):
        self.assertEqual(sorted(expand_ipaddress_pattern('1.2.3.[4-3]/32', 6)), [])

    def test_invalid_set(self):
        with self.assertRaises(ValueError):
            sorted(expand_ipaddress_pattern('1.2.3.[4]/32', 4))

        with self.assertRaises(ValueError):
            sorted(expand_ipaddress_pattern('1.2.3.[4,]/32', 4))

        with self.assertRaises(ValueError):
            sorted(expand_ipaddress_pattern('1.2.3.[,4]/32', 4))

        with self.assertRaises(ValueError):
            sorted(expand_ipaddress_pattern('1.2.3.[4,,5]/32', 4))


class ExpandAlphanumeric(TestCase):
    """
    Validate the operation of expand_alphanumeric_pattern().
    """
    def test_range_numberic(self):
        input = 'r[9-11]a'
        output = sorted([
            'r9a',
            'r10a',
            'r11a',
        ])

        self.assertEqual(sorted(expand_alphanumeric_pattern(input)), output)

    def test_range_alpha(self):
        input = '[r-t]1a'
        output = sorted([
            'r1a',
            's1a',
            't1a',
        ])

        self.assertEqual(sorted(expand_alphanumeric_pattern(input)), output)

    def test_set(self):
        input = '[r,t]1a'
        output = sorted([
            'r1a',
            't1a',
        ])

        self.assertEqual(sorted(expand_alphanumeric_pattern(input)), output)

    def test_set_multichar(self):
        input = '[ra,tb]1a'
        output = sorted([
            'ra1a',
            'tb1a',
        ])

        self.assertEqual(sorted(expand_alphanumeric_pattern(input)), output)

    def test_multiple_ranges(self):
        input = '[r-t]1[a-b]'
        output = sorted([
            'r1a',
            'r1b',
            's1a',
            's1b',
            't1a',
            't1b',
        ])

        self.assertEqual(sorted(expand_alphanumeric_pattern(input)), output)

    def test_multiple_sets(self):
        input = '[ra,tb]1[ax,by]'
        output = sorted([
            'ra1ax',
            'ra1by',
            'tb1ax',
            'tb1by',
        ])

        self.assertEqual(sorted(expand_alphanumeric_pattern(input)), output)

    def test_set_and_range(self):
        input = '[ra,tb]1[a-c]'
        output = sorted([
            'ra1a',
            'ra1b',
            'ra1c',
            'tb1a',
            'tb1b',
            'tb1c',
        ])

        self.assertEqual(sorted(expand_alphanumeric_pattern(input)), output)

    def test_invalid_non_pattern(self):
        with self.assertRaises(ValueError):
            sorted(expand_alphanumeric_pattern('r9a'))

    def test_invalid_range(self):
        with self.assertRaises(ValueError):
            sorted(expand_alphanumeric_pattern('r[8-]a'))

        with self.assertRaises(ValueError):
            sorted(expand_alphanumeric_pattern('r[-8]a'))

        with self.assertRaises(ValueError):
            sorted(expand_alphanumeric_pattern('r[8--9]a'))

    def test_invalid_range_alphanumeric(self):
        self.assertEqual(sorted(expand_alphanumeric_pattern('r[9-a]a')), [])
        self.assertEqual(sorted(expand_alphanumeric_pattern('r[a-9]a')), [])

    def test_invalid_range_bounds(self):
        self.assertEqual(sorted(expand_alphanumeric_pattern('r[9-8]a')), [])
        self.assertEqual(sorted(expand_alphanumeric_pattern('r[b-a]a')), [])

    def test_invalid_range_len(self):
        with self.assertRaises(forms.ValidationError):
            sorted(expand_alphanumeric_pattern('r[a-bb]a'))

    def test_invalid_set(self):
        with self.assertRaises(ValueError):
            sorted(expand_alphanumeric_pattern('r[a]a'))

        with self.assertRaises(ValueError):
            sorted(expand_alphanumeric_pattern('r[a,]a'))

        with self.assertRaises(ValueError):
            sorted(expand_alphanumeric_pattern('r[,a]a'))

        with self.assertRaises(ValueError):
            sorted(expand_alphanumeric_pattern('r[a,,b]a'))


class CSVDataFieldTest(TestCase):

    def setUp(self):
        self.field = CSVDataField(from_form=IPAddressCSVForm)

    def test_clean(self):
        input = """
        address,status,vrf
        192.0.2.1/32,Active,Test VRF
        """
        output = (
            {'address': None, 'status': None, 'vrf': None},
            [{'address': '192.0.2.1/32', 'status': 'Active', 'vrf': 'Test VRF'}]
        )
        self.assertEqual(self.field.clean(input), output)

    def test_clean_invalid_header(self):
        input = """
        address,status,vrf,xxx
        192.0.2.1/32,Active,Test VRF,123
        """
        with self.assertRaises(forms.ValidationError):
            self.field.clean(input)

    def test_clean_missing_required_header(self):
        input = """
        status,vrf
        Active,Test VRF
        """
        with self.assertRaises(forms.ValidationError):
            self.field.clean(input)

    def test_clean_default_to_field(self):
        input = """
        address,status,vrf.name
        192.0.2.1/32,Active,Test VRF
        """
        output = (
            {'address': None, 'status': None, 'vrf': 'name'},
            [{'address': '192.0.2.1/32', 'status': 'Active', 'vrf': 'Test VRF'}]
        )
        self.assertEqual(self.field.clean(input), output)

    def test_clean_pk_to_field(self):
        input = """
        address,status,vrf.pk
        192.0.2.1/32,Active,123
        """
        output = (
            {'address': None, 'status': None, 'vrf': 'pk'},
            [{'address': '192.0.2.1/32', 'status': 'Active', 'vrf': '123'}]
        )
        self.assertEqual(self.field.clean(input), output)

    def test_clean_custom_to_field(self):
        input = """
        address,status,vrf.rd
        192.0.2.1/32,Active,123:456
        """
        output = (
            {'address': None, 'status': None, 'vrf': 'rd'},
            [{'address': '192.0.2.1/32', 'status': 'Active', 'vrf': '123:456'}]
        )
        self.assertEqual(self.field.clean(input), output)

    def test_clean_invalid_to_field(self):
        input = """
        address,status,vrf.xxx
        192.0.2.1/32,Active,123:456
        """
        with self.assertRaises(forms.ValidationError):
            self.field.clean(input)

    def test_clean_to_field_on_non_object(self):
        input = """
        address,status.foo,vrf
        192.0.2.1/32,Bar,Test VRF
        """
        with self.assertRaises(forms.ValidationError):
            self.field.clean(input)