import datetime

from django.conf import settings
from django.db import connection
from django.test import TestCase
from django.utils import unittest

from models import (CustomPKModel, UniqueTogetherModel, UniqueFieldsModel,
    UniqueForDateModel, ModelToValidate)


class GetUniqueCheckTests(unittest.TestCase):
    def test_unique_fields_get_collected(self):
        m = UniqueFieldsModel()
        self.assertEqual(
            ([(UniqueFieldsModel, ('id',)),
              (UniqueFieldsModel, ('unique_charfield',)),
              (UniqueFieldsModel, ('unique_integerfield',))],
             []),
            m._get_unique_checks()
        )

    def test_unique_together_gets_picked_up_and_converted_to_tuple(self):
        m = UniqueTogetherModel()
        self.assertEqual(
            ([(UniqueTogetherModel, ('ifield', 'cfield',)),
              (UniqueTogetherModel, ('ifield', 'efield')),
              (UniqueTogetherModel, ('id',)), ],
             []),
            m._get_unique_checks()
        )

    def test_primary_key_is_considered_unique(self):
        m = CustomPKModel()
        self.assertEqual(([(CustomPKModel, ('my_pk_field',))], []), m._get_unique_checks())

    def test_unique_for_date_gets_picked_up(self):
        m = UniqueForDateModel()
        self.assertEqual((
            [(UniqueForDateModel, ('id',))],
            [(UniqueForDateModel, 'date', 'count', 'start_date'),
             (UniqueForDateModel, 'year', 'count', 'end_date'),
             (UniqueForDateModel, 'month', 'order', 'end_date')]
            ), m._get_unique_checks()
        )

    def test_unique_for_date_exclusion(self):
        m = UniqueForDateModel()
        self.assertEqual((
            [(UniqueForDateModel, ('id',))],
            [(UniqueForDateModel, 'year', 'count', 'end_date'),
             (UniqueForDateModel, 'month', 'order', 'end_date')]
            ), m._get_unique_checks(exclude='start_date')
        )

class PerformUniqueChecksTest(TestCase):
    def test_primary_key_unique_check_not_performed_when_adding_and_pk_not_specified(self):
        # Regression test for #12560
        def test():
            mtv = ModelToValidate(number=10, name='Some Name')
            setattr(mtv, '_adding', True)
            mtv.full_clean()
        self.assertNumQueries(0, test)

    def test_primary_key_unique_check_performed_when_adding_and_pk_specified(self):
        # Regression test for #12560
        def test():
            mtv = ModelToValidate(number=10, name='Some Name', id=123)
            setattr(mtv, '_adding', True)
            mtv.full_clean()
        self.assertNumQueries(1, test)

    def test_primary_key_unique_check_not_performed_when_not_adding(self):
        # Regression test for #12132
        def test():
            mtv = ModelToValidate(number=10, name='Some Name')
            mtv.full_clean()
        self.assertNumQueries(0, test)