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):

    @classmethod
    def setUpTestData(cls):
        cls.a1 = Article.objects.create(
            headline='Hello', pub_date=datetime(2005, 11, 27)
        ).pk
        cls.a2 = Article.objects.create(
            headline='Goodbye', pub_date=datetime(2005, 11, 28)
        ).pk
        cls.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_repr(self):
        or_expr = Q(baz=Article(headline="Foö"))
        self.assertEqual(repr(or_expr), "<Q: (AND: ('baz', <Article: Foö>))>")
        negated_or = ~Q(baz=Article(headline="Foö"))
        self.assertEqual(repr(negated_or), "<Q: (NOT (AND: ('baz', <Article: Foö>)))>")

    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.assertSequenceEqual(
            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)},
            ],
        )

        self.assertEqual(
            Article.objects.filter(Q(headline__startswith='Hello')).in_bulk([self.a1, self.a2]),
            {self.a1: Article.objects.get(pk=self.a1)}
        )
