import re

from django.core.exceptions import ValidationError
from django.forms import RegexField
from django.test import SimpleTestCase


class RegexFieldTest(SimpleTestCase):

    def test_regexfield_1(self):
        f = RegexField('^[0-9][A-F][0-9]$')
        self.assertEqual('2A2', f.clean('2A2'))
        self.assertEqual('3F3', f.clean('3F3'))
        with self.assertRaisesMessage(ValidationError, "'Enter a valid value.'"):
            f.clean('3G3')
        with self.assertRaisesMessage(ValidationError, "'Enter a valid value.'"):
            f.clean(' 2A2')
        with self.assertRaisesMessage(ValidationError, "'Enter a valid value.'"):
            f.clean('2A2 ')
        with self.assertRaisesMessage(ValidationError, "'This field is required.'"):
            f.clean('')

    def test_regexfield_2(self):
        f = RegexField('^[0-9][A-F][0-9]$', required=False)
        self.assertEqual('2A2', f.clean('2A2'))
        self.assertEqual('3F3', f.clean('3F3'))
        with self.assertRaisesMessage(ValidationError, "'Enter a valid value.'"):
            f.clean('3G3')
        self.assertEqual('', f.clean(''))

    def test_regexfield_3(self):
        f = RegexField(re.compile('^[0-9][A-F][0-9]$'))
        self.assertEqual('2A2', f.clean('2A2'))
        self.assertEqual('3F3', f.clean('3F3'))
        with self.assertRaisesMessage(ValidationError, "'Enter a valid value.'"):
            f.clean('3G3')
        with self.assertRaisesMessage(ValidationError, "'Enter a valid value.'"):
            f.clean(' 2A2')
        with self.assertRaisesMessage(ValidationError, "'Enter a valid value.'"):
            f.clean('2A2 ')

    def test_regexfield_4(self):
        f = RegexField('^[0-9]+$', min_length=5, max_length=10)
        with self.assertRaisesMessage(ValidationError, "'Ensure this value has at least 5 characters (it has 3).'"):
            f.clean('123')
        with self.assertRaisesMessage(
            ValidationError,
            "'Ensure this value has at least 5 characters (it has 3).', "
            "'Enter a valid value.'",
        ):
            f.clean('abc')
        self.assertEqual('12345', f.clean('12345'))
        self.assertEqual('1234567890', f.clean('1234567890'))
        with self.assertRaisesMessage(ValidationError, "'Ensure this value has at most 10 characters (it has 11).'"):
            f.clean('12345678901')
        with self.assertRaisesMessage(ValidationError, "'Enter a valid value.'"):
            f.clean('12345a')

    def test_regexfield_unicode_characters(self):
        f = RegexField(r'^\w+$')
        self.assertEqual('éèøçÎÎ你好', f.clean('éèøçÎÎ你好'))

    def test_change_regex_after_init(self):
        f = RegexField('^[a-z]+$')
        f.regex = '^[0-9]+$'
        self.assertEqual('1234', f.clean('1234'))
        with self.assertRaisesMessage(ValidationError, "'Enter a valid value.'"):
            f.clean('abcd')

    def test_get_regex(self):
        f = RegexField('^[a-z]+$')
        self.assertEqual(f.regex, re.compile('^[a-z]+$'))

    def test_regexfield_strip(self):
        f = RegexField('^[a-z]+$', strip=True)
        self.assertEqual(f.clean(' a'), 'a')
        self.assertEqual(f.clean('a '), 'a')

    def test_empty_value(self):
        f = RegexField('', required=False)
        self.assertEqual(f.clean(''), '')
        self.assertEqual(f.clean(None), '')
        f = RegexField('', empty_value=None, required=False)
        self.assertIsNone(f.clean(''))
        self.assertIsNone(f.clean(None))