import os
import re
import types
from datetime import datetime, timedelta
from decimal import Decimal
from unittest import TestCase, mock

from django.core.exceptions import ValidationError
from django.core.files.base import ContentFile
from django.core.validators import (
    BaseValidator, DecimalValidator, EmailValidator, FileExtensionValidator,
    MaxLengthValidator, MaxValueValidator, MinLengthValidator,
    MinValueValidator, ProhibitNullCharactersValidator, RegexValidator,
    URLValidator, int_list_validator, validate_comma_separated_integer_list,
    validate_email, validate_image_file_extension, validate_integer,
    validate_ipv4_address, validate_ipv6_address, validate_ipv46_address,
    validate_slug, validate_unicode_slug,
)
from django.test import SimpleTestCase

try:
    from PIL import Image  # noqa
except ImportError:
    PILLOW_IS_INSTALLED = False
else:
    PILLOW_IS_INSTALLED = True

NOW = datetime.now()
EXTENDED_SCHEMES = ['http', 'https', 'ftp', 'ftps', 'git', 'file', 'git+ssh']

TEST_DATA = [
    # (validator, value, expected),
    (validate_integer, '42', None),
    (validate_integer, '-42', None),
    (validate_integer, -42, None),

    (validate_integer, -42.5, ValidationError),
    (validate_integer, None, ValidationError),
    (validate_integer, 'a', ValidationError),
    (validate_integer, '\n42', ValidationError),
    (validate_integer, '42\n', ValidationError),

    (validate_email, 'email@here.com', None),
    (validate_email, 'weirder-email@here.and.there.com', None),
    (validate_email, 'email@[127.0.0.1]', None),
    (validate_email, 'email@[2001:dB8::1]', None),
    (validate_email, 'email@[2001:dB8:0:0:0:0:0:1]', None),
    (validate_email, 'email@[::fffF:127.0.0.1]', None),
    (validate_email, 'example@valid-----hyphens.com', None),
    (validate_email, 'example@valid-with-hyphens.com', None),
    (validate_email, 'test@domain.with.idn.tld.उदाहरण.परीक्षा', None),
    (validate_email, 'email@localhost', None),
    (EmailValidator(whitelist=['localdomain']), 'email@localdomain', None),
    (validate_email, '"test@test"@example.com', None),
    (validate_email, 'example@atm.%s' % ('a' * 63), None),
    (validate_email, 'example@%s.atm' % ('a' * 63), None),
    (validate_email, 'example@%s.%s.atm' % ('a' * 63, 'b' * 10), None),

    (validate_email, 'example@atm.%s' % ('a' * 64), ValidationError),
    (validate_email, 'example@%s.atm.%s' % ('b' * 64, 'a' * 63), ValidationError),
    (validate_email, None, ValidationError),
    (validate_email, '', ValidationError),
    (validate_email, 'abc', ValidationError),
    (validate_email, 'abc@', ValidationError),
    (validate_email, 'abc@bar', ValidationError),
    (validate_email, 'a @x.cz', ValidationError),
    (validate_email, 'abc@.com', ValidationError),
    (validate_email, 'something@@somewhere.com', ValidationError),
    (validate_email, 'email@127.0.0.1', ValidationError),
    (validate_email, 'email@[127.0.0.256]', ValidationError),
    (validate_email, 'email@[2001:db8::12345]', ValidationError),
    (validate_email, 'email@[2001:db8:0:0:0:0:1]', ValidationError),
    (validate_email, 'email@[::ffff:127.0.0.256]', ValidationError),
    (validate_email, 'example@invalid-.com', ValidationError),
    (validate_email, 'example@-invalid.com', ValidationError),
    (validate_email, 'example@invalid.com-', ValidationError),
    (validate_email, 'example@inv-.alid-.com', ValidationError),
    (validate_email, 'example@inv-.-alid.com', ValidationError),
    (validate_email, 'test@example.com\n\n<script src="x.js">', ValidationError),
    # Quoted-string format (CR not allowed)
    (validate_email, '"\\\011"@here.com', None),
    (validate_email, '"\\\012"@here.com', ValidationError),
    (validate_email, 'trailingdot@shouldfail.com.', ValidationError),
    # Max length of domain name labels is 63 characters per RFC 1034.
    (validate_email, 'a@%s.us' % ('a' * 63), None),
    (validate_email, 'a@%s.us' % ('a' * 64), ValidationError),
    # Trailing newlines in username or domain not allowed
    (validate_email, 'a@b.com\n', ValidationError),
    (validate_email, 'a\n@b.com', ValidationError),
    (validate_email, '"test@test"\n@example.com', ValidationError),
    (validate_email, 'a@[127.0.0.1]\n', ValidationError),

    (validate_slug, 'slug-ok', None),
    (validate_slug, 'longer-slug-still-ok', None),
    (validate_slug, '--------', None),
    (validate_slug, 'nohyphensoranything', None),
    (validate_slug, 'a', None),
    (validate_slug, '1', None),
    (validate_slug, 'a1', None),

    (validate_slug, '', ValidationError),
    (validate_slug, ' text ', ValidationError),
    (validate_slug, ' ', ValidationError),
    (validate_slug, 'some@mail.com', ValidationError),
    (validate_slug, '你好', ValidationError),
    (validate_slug, '你 好', ValidationError),
    (validate_slug, '\n', ValidationError),
    (validate_slug, 'trailing-newline\n', ValidationError),

    (validate_unicode_slug, 'slug-ok', None),
    (validate_unicode_slug, 'longer-slug-still-ok', None),
    (validate_unicode_slug, '--------', None),
    (validate_unicode_slug, 'nohyphensoranything', None),
    (validate_unicode_slug, 'a', None),
    (validate_unicode_slug, '1', None),
    (validate_unicode_slug, 'a1', None),
    (validate_unicode_slug, '你好', None),

    (validate_unicode_slug, '', ValidationError),
    (validate_unicode_slug, ' text ', ValidationError),
    (validate_unicode_slug, ' ', ValidationError),
    (validate_unicode_slug, 'some@mail.com', ValidationError),
    (validate_unicode_slug, '\n', ValidationError),
    (validate_unicode_slug, '你 好', ValidationError),
    (validate_unicode_slug, 'trailing-newline\n', ValidationError),

    (validate_ipv4_address, '1.1.1.1', None),
    (validate_ipv4_address, '255.0.0.0', None),
    (validate_ipv4_address, '0.0.0.0', None),

    (validate_ipv4_address, '256.1.1.1', ValidationError),
    (validate_ipv4_address, '25.1.1.', ValidationError),
    (validate_ipv4_address, '25,1,1,1', ValidationError),
    (validate_ipv4_address, '25.1 .1.1', ValidationError),
    (validate_ipv4_address, '1.1.1.1\n', ValidationError),
    (validate_ipv4_address, '٧.2٥.3٣.243', ValidationError),

    # validate_ipv6_address uses django.utils.ipv6, which
    # is tested in much greater detail in its own testcase
    (validate_ipv6_address, 'fe80::1', None),
    (validate_ipv6_address, '::1', None),
    (validate_ipv6_address, '1:2:3:4:5:6:7:8', None),

    (validate_ipv6_address, '1:2', ValidationError),
    (validate_ipv6_address, '::zzz', ValidationError),
    (validate_ipv6_address, '12345::', ValidationError),

    (validate_ipv46_address, '1.1.1.1', None),
    (validate_ipv46_address, '255.0.0.0', None),
    (validate_ipv46_address, '0.0.0.0', None),
    (validate_ipv46_address, 'fe80::1', None),
    (validate_ipv46_address, '::1', None),
    (validate_ipv46_address, '1:2:3:4:5:6:7:8', None),

    (validate_ipv46_address, '256.1.1.1', ValidationError),
    (validate_ipv46_address, '25.1.1.', ValidationError),
    (validate_ipv46_address, '25,1,1,1', ValidationError),
    (validate_ipv46_address, '25.1 .1.1', ValidationError),
    (validate_ipv46_address, '1:2', ValidationError),
    (validate_ipv46_address, '::zzz', ValidationError),
    (validate_ipv46_address, '12345::', ValidationError),

    (validate_comma_separated_integer_list, '1', None),
    (validate_comma_separated_integer_list, '12', None),
    (validate_comma_separated_integer_list, '1,2', None),
    (validate_comma_separated_integer_list, '1,2,3', None),
    (validate_comma_separated_integer_list, '10,32', None),

    (validate_comma_separated_integer_list, '', ValidationError),
    (validate_comma_separated_integer_list, 'a', ValidationError),
    (validate_comma_separated_integer_list, 'a,b,c', ValidationError),
    (validate_comma_separated_integer_list, '1, 2, 3', ValidationError),
    (validate_comma_separated_integer_list, ',', ValidationError),
    (validate_comma_separated_integer_list, '1,2,3,', ValidationError),
    (validate_comma_separated_integer_list, '1,2,', ValidationError),
    (validate_comma_separated_integer_list, ',1', ValidationError),
    (validate_comma_separated_integer_list, '1,,2', ValidationError),

    (int_list_validator(sep='.'), '1.2.3', None),
    (int_list_validator(sep='.', allow_negative=True), '1.2.3', None),
    (int_list_validator(allow_negative=True), '-1,-2,3', None),
    (int_list_validator(allow_negative=True), '1,-2,-12', None),

    (int_list_validator(), '-1,2,3', ValidationError),
    (int_list_validator(sep='.'), '1,2,3', ValidationError),
    (int_list_validator(sep='.'), '1.2.3\n', ValidationError),

    (MaxValueValidator(10), 10, None),
    (MaxValueValidator(10), -10, None),
    (MaxValueValidator(10), 0, None),
    (MaxValueValidator(NOW), NOW, None),
    (MaxValueValidator(NOW), NOW - timedelta(days=1), None),

    (MaxValueValidator(0), 1, ValidationError),
    (MaxValueValidator(NOW), NOW + timedelta(days=1), ValidationError),

    (MinValueValidator(-10), -10, None),
    (MinValueValidator(-10), 10, None),
    (MinValueValidator(-10), 0, None),
    (MinValueValidator(NOW), NOW, None),
    (MinValueValidator(NOW), NOW + timedelta(days=1), None),

    (MinValueValidator(0), -1, ValidationError),
    (MinValueValidator(NOW), NOW - timedelta(days=1), ValidationError),

    # limit_value may be a callable.
    (MinValueValidator(lambda: 1), 0, ValidationError),
    (MinValueValidator(lambda: 1), 1, None),

    (MaxLengthValidator(10), '', None),
    (MaxLengthValidator(10), 10 * 'x', None),

    (MaxLengthValidator(10), 15 * 'x', ValidationError),

    (MinLengthValidator(10), 15 * 'x', None),
    (MinLengthValidator(10), 10 * 'x', None),

    (MinLengthValidator(10), '', ValidationError),

    (URLValidator(EXTENDED_SCHEMES), 'file://localhost/path', None),
    (URLValidator(EXTENDED_SCHEMES), 'git://example.com/', None),
    (URLValidator(EXTENDED_SCHEMES), 'git+ssh://git@github.com/example/hg-git.git', None),

    (URLValidator(EXTENDED_SCHEMES), 'git://-invalid.com', ValidationError),
    # Trailing newlines not accepted
    (URLValidator(), 'http://www.djangoproject.com/\n', ValidationError),
    (URLValidator(), 'http://[::ffff:192.9.5.5]\n', ValidationError),
    # Trailing junk does not take forever to reject
    (URLValidator(), 'http://www.asdasdasdasdsadfm.com.br ', ValidationError),
    (URLValidator(), 'http://www.asdasdasdasdsadfm.com.br z', ValidationError),

    (BaseValidator(True), True, None),
    (BaseValidator(True), False, ValidationError),

    (RegexValidator(), '', None),
    (RegexValidator(), 'x1x2', None),
    (RegexValidator('[0-9]+'), 'xxxxxx', ValidationError),
    (RegexValidator('[0-9]+'), '1234', None),
    (RegexValidator(re.compile('[0-9]+')), '1234', None),
    (RegexValidator('.*'), '', None),
    (RegexValidator(re.compile('.*')), '', None),
    (RegexValidator('.*'), 'xxxxx', None),

    (RegexValidator('x'), 'y', ValidationError),
    (RegexValidator(re.compile('x')), 'y', ValidationError),
    (RegexValidator('x', inverse_match=True), 'y', None),
    (RegexValidator(re.compile('x'), inverse_match=True), 'y', None),
    (RegexValidator('x', inverse_match=True), 'x', ValidationError),
    (RegexValidator(re.compile('x'), inverse_match=True), 'x', ValidationError),

    (RegexValidator('x', flags=re.IGNORECASE), 'y', ValidationError),
    (RegexValidator('a'), 'A', ValidationError),
    (RegexValidator('a', flags=re.IGNORECASE), 'A', None),

    (FileExtensionValidator(['txt']), ContentFile('contents', name='fileWithUnsupportedExt.jpg'), ValidationError),
    (FileExtensionValidator(['txt']), ContentFile('contents', name='fileWithUnsupportedExt.JPG'), ValidationError),
    (FileExtensionValidator(['txt']), ContentFile('contents', name='fileWithNoExtension'), ValidationError),
    (FileExtensionValidator(['']), ContentFile('contents', name='fileWithAnExtension.txt'), ValidationError),
    (FileExtensionValidator([]), ContentFile('contents', name='file.txt'), ValidationError),

    (FileExtensionValidator(['']), ContentFile('contents', name='fileWithNoExtension'), None),
    (FileExtensionValidator(['txt']), ContentFile('contents', name='file.txt'), None),
    (FileExtensionValidator(['txt']), ContentFile('contents', name='file.TXT'), None),
    (FileExtensionValidator(['TXT']), ContentFile('contents', name='file.txt'), None),
    (FileExtensionValidator(), ContentFile('contents', name='file.jpg'), None),

    (DecimalValidator(max_digits=2, decimal_places=2), Decimal('0.99'), None),
    (DecimalValidator(max_digits=2, decimal_places=1), Decimal('0.99'), ValidationError),
    (DecimalValidator(max_digits=3, decimal_places=1), Decimal('999'), ValidationError),
    (DecimalValidator(max_digits=4, decimal_places=1), Decimal('999'), None),
    (DecimalValidator(max_digits=20, decimal_places=2), Decimal('742403889818000000'), None),
    (DecimalValidator(20, 2), Decimal('7.42403889818E+17'), None),
    (DecimalValidator(max_digits=20, decimal_places=2), Decimal('7424742403889818000000'), ValidationError),
    (DecimalValidator(max_digits=5, decimal_places=2), Decimal('7304E-1'), None),
    (DecimalValidator(max_digits=5, decimal_places=2), Decimal('7304E-3'), ValidationError),
    (DecimalValidator(max_digits=5, decimal_places=5), Decimal('70E-5'), None),
    (DecimalValidator(max_digits=5, decimal_places=5), Decimal('70E-6'), ValidationError),
    # 'Enter a number.' errors
    *[
        (DecimalValidator(decimal_places=2, max_digits=10), Decimal(value), ValidationError)
        for value in (
            'NaN', '-NaN', '+NaN', 'sNaN', '-sNaN', '+sNaN',
            'Inf', '-Inf', '+Inf', 'Infinity', '-Infinity', '-Infinity',
        )
    ],

    (validate_image_file_extension, ContentFile('contents', name='file.jpg'), None),
    (validate_image_file_extension, ContentFile('contents', name='file.png'), None),
    (validate_image_file_extension, ContentFile('contents', name='file.PNG'), None),
    (validate_image_file_extension, ContentFile('contents', name='file.txt'), ValidationError),
    (validate_image_file_extension, ContentFile('contents', name='file'), ValidationError),

    (ProhibitNullCharactersValidator(), '\x00something', ValidationError),
    (ProhibitNullCharactersValidator(), 'something', None),
    (ProhibitNullCharactersValidator(), None, None),
]


def create_path(filename):
    return os.path.abspath(os.path.join(os.path.dirname(__file__), filename))


# Add valid and invalid URL tests.
# This only tests the validator without extended schemes.
with open(create_path('valid_urls.txt'), encoding='utf8') as f:
    for url in f:
        TEST_DATA.append((URLValidator(), url.strip(), None))
with open(create_path('invalid_urls.txt'), encoding='utf8') as f:
    for url in f:
        TEST_DATA.append((URLValidator(), url.strip(), ValidationError))


class TestValidators(SimpleTestCase):

    def test_validators(self):
        for validator, value, expected in TEST_DATA:
            name = validator.__name__ if isinstance(validator, types.FunctionType) else validator.__class__.__name__
            exception_expected = expected is not None and issubclass(expected, Exception)
            with self.subTest(name, value=value):
                if validator is validate_image_file_extension and not PILLOW_IS_INSTALLED:
                    self.skipTest('Pillow is required to test validate_image_file_extension.')
                if exception_expected:
                    with self.assertRaises(expected):
                        validator(value)
                else:
                    self.assertEqual(expected, validator(value))

    def test_single_message(self):
        v = ValidationError('Not Valid')
        self.assertEqual(str(v), "['Not Valid']")
        self.assertEqual(repr(v), "ValidationError(['Not Valid'])")

    def test_message_list(self):
        v = ValidationError(['First Problem', 'Second Problem'])
        self.assertEqual(str(v), "['First Problem', 'Second Problem']")
        self.assertEqual(repr(v), "ValidationError(['First Problem', 'Second Problem'])")

    def test_message_dict(self):
        v = ValidationError({'first': ['First Problem']})
        self.assertEqual(str(v), "{'first': ['First Problem']}")
        self.assertEqual(repr(v), "ValidationError({'first': ['First Problem']})")

    def test_regex_validator_flags(self):
        msg = 'If the flags are set, regex must be a regular expression string.'
        with self.assertRaisesMessage(TypeError, msg):
            RegexValidator(re.compile('a'), flags=re.IGNORECASE)

    def test_max_length_validator_message(self):
        v = MaxLengthValidator(16, message='"%(value)s" has more than %(limit_value)d characters.')
        with self.assertRaisesMessage(ValidationError, '"djangoproject.com" has more than 16 characters.'):
            v('djangoproject.com')


class TestValidatorEquality(TestCase):
    """
    Validators have valid equality operators (#21638)
    """

    def test_regex_equality(self):
        self.assertEqual(
            RegexValidator(r'^(?:[a-z0-9\.\-]*)://'),
            RegexValidator(r'^(?:[a-z0-9\.\-]*)://'),
        )
        self.assertNotEqual(
            RegexValidator(r'^(?:[a-z0-9\.\-]*)://'),
            RegexValidator(r'^(?:[0-9\.\-]*)://'),
        )
        self.assertEqual(
            RegexValidator(r'^(?:[a-z0-9\.\-]*)://', "oh noes", "invalid"),
            RegexValidator(r'^(?:[a-z0-9\.\-]*)://', "oh noes", "invalid"),
        )
        self.assertNotEqual(
            RegexValidator(r'^(?:[a-z0-9\.\-]*)://', "oh", "invalid"),
            RegexValidator(r'^(?:[a-z0-9\.\-]*)://', "oh noes", "invalid"),
        )
        self.assertNotEqual(
            RegexValidator(r'^(?:[a-z0-9\.\-]*)://', "oh noes", "invalid"),
            RegexValidator(r'^(?:[a-z0-9\.\-]*)://'),
        )

        self.assertNotEqual(
            RegexValidator('', flags=re.IGNORECASE),
            RegexValidator(''),
        )

        self.assertNotEqual(
            RegexValidator(''),
            RegexValidator('', inverse_match=True),
        )

    def test_regex_equality_nocache(self):
        pattern = r'^(?:[a-z0-9\.\-]*)://'
        left = RegexValidator(pattern)
        re.purge()
        right = RegexValidator(pattern)

        self.assertEqual(
            left,
            right,
        )

    def test_regex_equality_blank(self):
        self.assertEqual(
            RegexValidator(),
            RegexValidator(),
        )

    def test_email_equality(self):
        self.assertEqual(
            EmailValidator(),
            EmailValidator(),
        )
        self.assertNotEqual(
            EmailValidator(message="BAD EMAIL"),
            EmailValidator(),
        )
        self.assertEqual(
            EmailValidator(message="BAD EMAIL", code="bad"),
            EmailValidator(message="BAD EMAIL", code="bad"),
        )

    def test_basic_equality(self):
        self.assertEqual(
            MaxValueValidator(44),
            MaxValueValidator(44),
        )
        self.assertEqual(MaxValueValidator(44), mock.ANY)
        self.assertNotEqual(
            MaxValueValidator(44),
            MinValueValidator(44),
        )
        self.assertNotEqual(
            MinValueValidator(45),
            MinValueValidator(11),
        )

    def test_decimal_equality(self):
        self.assertEqual(
            DecimalValidator(1, 2),
            DecimalValidator(1, 2),
        )
        self.assertNotEqual(
            DecimalValidator(1, 2),
            DecimalValidator(1, 1),
        )
        self.assertNotEqual(
            DecimalValidator(1, 2),
            DecimalValidator(2, 2),
        )
        self.assertNotEqual(
            DecimalValidator(1, 2),
            MinValueValidator(11),
        )

    def test_file_extension_equality(self):
        self.assertEqual(
            FileExtensionValidator(),
            FileExtensionValidator()
        )
        self.assertEqual(
            FileExtensionValidator(['txt']),
            FileExtensionValidator(['txt'])
        )
        self.assertEqual(
            FileExtensionValidator(['TXT']),
            FileExtensionValidator(['txt'])
        )
        self.assertEqual(
            FileExtensionValidator(['TXT', 'png']),
            FileExtensionValidator(['txt', 'png'])
        )
        self.assertEqual(
            FileExtensionValidator(['txt']),
            FileExtensionValidator(['txt'], code='invalid_extension')
        )
        self.assertNotEqual(
            FileExtensionValidator(['txt']),
            FileExtensionValidator(['png'])
        )
        self.assertNotEqual(
            FileExtensionValidator(['txt']),
            FileExtensionValidator(['png', 'jpg'])
        )
        self.assertNotEqual(
            FileExtensionValidator(['txt']),
            FileExtensionValidator(['txt'], code='custom_code')
        )
        self.assertNotEqual(
            FileExtensionValidator(['txt']),
            FileExtensionValidator(['txt'], message='custom error message')
        )

    def test_prohibit_null_characters_validator_equality(self):
        self.assertEqual(
            ProhibitNullCharactersValidator(message='message', code='code'),
            ProhibitNullCharactersValidator(message='message', code='code')
        )
        self.assertEqual(
            ProhibitNullCharactersValidator(),
            ProhibitNullCharactersValidator()
        )
        self.assertNotEqual(
            ProhibitNullCharactersValidator(message='message1', code='code'),
            ProhibitNullCharactersValidator(message='message2', code='code')
        )
        self.assertNotEqual(
            ProhibitNullCharactersValidator(message='message', code='code1'),
            ProhibitNullCharactersValidator(message='message', code='code2')
        )
