from datetime import datetime

from operator import attrgetter

from django.db.models import Q

from django.test import TestCase

from models import Article

class OrLookupsTests(TestCase):

    def setUp(self):

        self.a1 = Article.objects.create(

            headline='Hello', pub_date=datetime(2005, 11, 27)

        ).pk

        self.a2 = Article.objects.create(

            headline='Goodbye', pub_date=datetime(2005, 11, 28)

        ).pk

        self.a3 = Article.objects.create(

            headline='Hello and goodbye', pub_date=datetime(2005, 11, 29)

        ).pk

    def test_filter_or(self):

        self.assertQuerysetEqual(

            Article.objects.filter(headline__startswith='Hello') |  Article.objects.filter(headline__startswith='Goodbye'), [

                'Hello',

                'Goodbye',

                'Hello and goodbye'

            ],

            attrgetter("headline")

        )

        self.assertQuerysetEqual(

            Article.objects.filter(headline__contains='Hello') | Article.objects.filter(headline__contains='bye'), [

                'Hello',

                'Goodbye',

                'Hello and goodbye'

            ],

            attrgetter("headline")

        )

        self.assertQuerysetEqual(

            Article.objects.filter(headline__iexact='Hello') | Article.objects.filter(headline__contains='ood'), [

                'Hello',

                'Goodbye',

                'Hello and goodbye'

            ],

            attrgetter("headline")

        )

        self.assertQuerysetEqual(

            Article.objects.filter(Q(headline__startswith='Hello') | Q(headline__startswith='Goodbye')), [

                'Hello',

                'Goodbye',

                'Hello and goodbye'

            ],

            attrgetter("headline")

        )

    def test_stages(self):

        # You can shorten this syntax with code like the following,  which is

        # especially useful if building the query in stages:

        articles = Article.objects.all()

        self.assertQuerysetEqual(

            articles.filter(headline__startswith='Hello') & articles.filter(headline__startswith='Goodbye'),

            []

        )

        self.assertQuerysetEqual(

            articles.filter(headline__startswith='Hello') & articles.filter(headline__contains='bye'), [

                'Hello and goodbye'

            ],

            attrgetter("headline")

        )

    def test_pk_q(self):

        self.assertQuerysetEqual(

            Article.objects.filter(Q(pk=self.a1) | Q(pk=self.a2)), [

                'Hello',

                'Goodbye'

            ],

            attrgetter("headline")

        )

        self.assertQuerysetEqual(

            Article.objects.filter(Q(pk=self.a1) | Q(pk=self.a2) | Q(pk=self.a3)), [

                'Hello',

                'Goodbye',

                'Hello and goodbye'

            ],

            attrgetter("headline"),

        )

    def test_pk_in(self):

        self.assertQuerysetEqual(

            Article.objects.filter(pk__in=[self.a1, self.a2, self.a3]), [

                'Hello',

                'Goodbye',

                'Hello and goodbye'

            ],

            attrgetter("headline"),

        )

        self.assertQuerysetEqual(

            Article.objects.filter(pk__in=(self.a1, self.a2, self.a3)), [

                'Hello',

                'Goodbye',

                'Hello and goodbye'

            ],

            attrgetter("headline"),

        )

        self.assertQuerysetEqual(

            Article.objects.filter(pk__in=[self.a1, self.a2, self.a3, 40000]), [

                'Hello',

                'Goodbye',

                'Hello and goodbye'

            ],

            attrgetter("headline"),

        )

    def test_q_negated(self):

        # Q objects can be negated

        self.assertQuerysetEqual(

            Article.objects.filter(Q(pk=self.a1) | ~Q(pk=self.a2)), [

                'Hello',

                'Hello and goodbye'

            ],

            attrgetter("headline")

        )

        self.assertQuerysetEqual(

            Article.objects.filter(~Q(pk=self.a1) & ~Q(pk=self.a2)), [

                'Hello and goodbye'

            ],

            attrgetter("headline"),

        )

        # This allows for more complex queries than filter() and exclude()

        # alone would allow

        self.assertQuerysetEqual(

            Article.objects.filter(Q(pk=self.a1) & (~Q(pk=self.a2) | Q(pk=self.a3))), [

                'Hello'

            ],

            attrgetter("headline"),

        )

    def test_complex_filter(self):

        # The 'complex_filter' method supports framework features such as

        # 'limit_choices_to' which normally take a single dictionary of lookup

        # arguments but need to support arbitrary queries via Q objects too.

        self.assertQuerysetEqual(

            Article.objects.complex_filter({'pk': self.a1}), [

                'Hello'

            ],

            attrgetter("headline"),

        )

        self.assertQuerysetEqual(

            Article.objects.complex_filter(Q(pk=self.a1) | Q(pk=self.a2)), [

                'Hello',

                'Goodbye'

            ],

            attrgetter("headline"),

        )

    def test_empty_in(self):

        # Passing "in" an empty list returns no results ...

        self.assertQuerysetEqual(

            Article.objects.filter(pk__in=[]),

            []

        )

        # ... but can return results if we OR it with another query.

        self.assertQuerysetEqual(

            Article.objects.filter(Q(pk__in=[]) | Q(headline__icontains='goodbye')), [

                'Goodbye',

                'Hello and goodbye'

            ],

            attrgetter("headline"),

        )

    def test_q_and(self):

        # Q arg objects are ANDed

        self.assertQuerysetEqual(

            Article.objects.filter(Q(headline__startswith='Hello'), Q(headline__contains='bye')), [

                'Hello and goodbye'

            ],

            attrgetter("headline")

        )

        # Q arg AND order is irrelevant

        self.assertQuerysetEqual(

            Article.objects.filter(Q(headline__contains='bye'), headline__startswith='Hello'), [

                'Hello and goodbye'

            ],

            attrgetter("headline"),

        )

        self.assertQuerysetEqual(

            Article.objects.filter(Q(headline__startswith='Hello') & Q(headline__startswith='Goodbye')),

            []

        )

    def test_q_exclude(self):

        self.assertQuerysetEqual(

            Article.objects.exclude(Q(headline__startswith='Hello')), [

                'Goodbye'

            ],

            attrgetter("headline")

        )

    def test_other_arg_queries(self):

        # Try some arg queries with operations other than filter.

        self.assertEqual(

            Article.objects.get(Q(headline__startswith='Hello'), Q(headline__contains='bye')).headline,

            'Hello and goodbye'

        )

        self.assertEqual(

            Article.objects.filter(Q(headline__startswith='Hello') | Q(headline__contains='bye')).count(),

            3

        )

        self.assertQuerysetEqual(

            Article.objects.filter(Q(headline__startswith='Hello'), Q(headline__contains='bye')).values(), [

                {"headline": "Hello and goodbye", "id": self.a3, "pub_date": datetime(2005, 11, 29)},

            ],

            lambda o: o,

        )

        self.assertEqual(

            Article.objects.filter(Q(headline__startswith='Hello')).in_bulk([self.a1, self.a2]),

            {self.a1: Article.objects.get(pk=self.a1)}

        )