from unittest import TestCase

from django.core.exceptions import ValidationError
from django.core.validators import validate_integer, validate_email, RequiredIfOtherFieldBlank

class TestSimpleValidators(TestCase):
    pass

SIMPLE_VALIDATORS_VALUES = (
    # (validator, value, expected),
    (validate_integer, '42', None),
    (validate_integer, '-42', None),
    (validate_integer, -42, None),
    (validate_integer, -42.5, None),
    (validate_integer, None, ValidationError),
    (validate_integer, 'a', ValidationError),
    (validate_email, 'email@here.com', None),
    (validate_email, 'weirder-email@here.and.there.com', None),
    (validate_email, None, ValidationError),
    (validate_email, '', ValidationError),
    (validate_email, 'abc', ValidationError),
    (validate_email, 'a @x.cz', ValidationError),
    (validate_email, 'something@@somewhere.com', ValidationError),
)

def get_simple_test_func(validator, expected, value, num):
    if isinstance(expected, type) and issubclass(expected, Exception):
        test_mask = 'test_%s_raises_error_%d'
        def test_func(self):
            self.assertRaises(expected, validator, value)
    else:
        test_mask = 'test_%s_%d'
        def test_func(self):
            self.assertEqual(expected, validator(value))
    test_name = test_mask % (validator.__name__, num)
    return test_name, test_func

test_counter = {}
for validator, value, expected in SIMPLE_VALIDATORS_VALUES:
    num = test_counter[validator] = test_counter.setdefault(validator, 0) + 1
    setattr(TestSimpleValidators, *get_simple_test_func(validator, expected, value, num))

class TestComplexValidators(TestCase):
    pass

COMPLEX_VALIDATORS_VALUES = (
    #(validator, value, all_values, obj, expected),
    (RequiredIfOtherFieldBlank('other'), 'given', {'other': 'given'}, None, None),
    (RequiredIfOtherFieldBlank('other'), '', {'other': 'given'}, None, None),
    (RequiredIfOtherFieldBlank('other'), 'given', {}, None, AssertionError),
    (RequiredIfOtherFieldBlank('other'), '', {}, None, AssertionError),
    (RequiredIfOtherFieldBlank('other'), '', {'other': ''}, None, ValidationError),
)

def get_complex_test_func(validator, expected, value, all_values, obj, num):
    if isinstance(expected, type) and issubclass(expected, Exception):
        test_mask = 'test_%s_raises_error_%d'
        def test_func(self):
            self.assertRaises(expected, validator, value, all_values=all_values, obj=obj)
    else:
        test_mask = 'test_%s_%d'
        def test_func(self):
            self.assertEqual(expected, validator(value, all_values=all_values, obj=obj))
    test_name = test_mask % (validator.__class__.__name__, num)
    return test_name, test_func

test_counter = {}
for validator, value, all_values, obj, expected in COMPLEX_VALIDATORS_VALUES:
    num = test_counter[validator.__class__.__name__] = test_counter.setdefault(validator.__class__.__name__, 0) + 1
    setattr(TestComplexValidators, *get_complex_test_func(validator, expected, value, all_values, obj, num))