from __future__ import unicode_literals

import datetime
from decimal import Decimal

from django.core.exceptions import FieldDoesNotExist, FieldError
from django.db.models import (
    F, BooleanField, CharField, Count, Func, IntegerField, Sum, Value,
)
from django.test import TestCase
from django.utils import six

from .models import (
    Author, Book, Company, DepartmentStore, Employee, Publisher, Store,
)


def cxOracle_513_py3_bug(func):
    """
    cx_Oracle versions up to and including 5.1.3 have a bug with respect to
    string handling under Python3 (essentially, they treat Python3 strings
    as Python2 strings rather than unicode). This makes some tests here
    fail under Python 3 -- so we mark them as expected failures.

    See  https://code.djangoproject.com/ticket/23843, in particular comment 6,
    which points to https://bitbucket.org/anthony_tuininga/cx_oracle/issue/6/
    """
    from unittest import expectedFailure
    from django.db import connection

    if connection.vendor == 'oracle' and six.PY3 and connection.Database.version <= '5.1.3':
        return expectedFailure(func)
    else:
        return func


class NonAggregateAnnotationTestCase(TestCase):

    @classmethod
    def setUpTestData(cls):
        cls.a1 = Author.objects.create(name='Adrian Holovaty', age=34)
        cls.a2 = Author.objects.create(name='Jacob Kaplan-Moss', age=35)
        cls.a3 = Author.objects.create(name='Brad Dayley', age=45)
        cls.a4 = Author.objects.create(name='James Bennett', age=29)
        cls.a5 = Author.objects.create(name='Jeffrey Forcier', age=37)
        cls.a6 = Author.objects.create(name='Paul Bissex', age=29)
        cls.a7 = Author.objects.create(name='Wesley J. Chun', age=25)
        cls.a8 = Author.objects.create(name='Peter Norvig', age=57)
        cls.a9 = Author.objects.create(name='Stuart Russell', age=46)
        cls.a1.friends.add(cls.a2, cls.a4)
        cls.a2.friends.add(cls.a1, cls.a7)
        cls.a4.friends.add(cls.a1)
        cls.a5.friends.add(cls.a6, cls.a7)
        cls.a6.friends.add(cls.a5, cls.a7)
        cls.a7.friends.add(cls.a2, cls.a5, cls.a6)
        cls.a8.friends.add(cls.a9)
        cls.a9.friends.add(cls.a8)

        cls.p1 = Publisher.objects.create(name='Apress', num_awards=3)
        cls.p2 = Publisher.objects.create(name='Sams', num_awards=1)
        cls.p3 = Publisher.objects.create(name='Prentice Hall', num_awards=7)
        cls.p4 = Publisher.objects.create(name='Morgan Kaufmann', num_awards=9)
        cls.p5 = Publisher.objects.create(name="Jonno's House of Books", num_awards=0)

        cls.b1 = Book.objects.create(
            isbn='159059725', name='The Definitive Guide to Django: Web Development Done Right',
            pages=447, rating=4.5, price=Decimal('30.00'), contact=cls.a1, publisher=cls.p1,
            pubdate=datetime.date(2007, 12, 6)
        )
        cls.b2 = Book.objects.create(
            isbn='067232959', name='Sams Teach Yourself Django in 24 Hours',
            pages=528, rating=3.0, price=Decimal('23.09'), contact=cls.a3, publisher=cls.p2,
            pubdate=datetime.date(2008, 3, 3)
        )
        cls.b3 = Book.objects.create(
            isbn='159059996', name='Practical Django Projects',
            pages=300, rating=4.0, price=Decimal('29.69'), contact=cls.a4, publisher=cls.p1,
            pubdate=datetime.date(2008, 6, 23)
        )
        cls.b4 = Book.objects.create(
            isbn='013235613', name='Python Web Development with Django',
            pages=350, rating=4.0, price=Decimal('29.69'), contact=cls.a5, publisher=cls.p3,
            pubdate=datetime.date(2008, 11, 3)
        )
        cls.b5 = Book.objects.create(
            isbn='013790395', name='Artificial Intelligence: A Modern Approach',
            pages=1132, rating=4.0, price=Decimal('82.80'), contact=cls.a8, publisher=cls.p3,
            pubdate=datetime.date(1995, 1, 15)
        )
        cls.b6 = Book.objects.create(
            isbn='155860191', name='Paradigms of Artificial Intelligence Programming: Case Studies in Common Lisp',
            pages=946, rating=5.0, price=Decimal('75.00'), contact=cls.a8, publisher=cls.p4,
            pubdate=datetime.date(1991, 10, 15)
        )
        cls.b1.authors.add(cls.a1, cls.a2)
        cls.b2.authors.add(cls.a3)
        cls.b3.authors.add(cls.a4)
        cls.b4.authors.add(cls.a5, cls.a6, cls.a7)
        cls.b5.authors.add(cls.a8, cls.a9)
        cls.b6.authors.add(cls.a8)

        s1 = Store.objects.create(
            name='Amazon.com',
            original_opening=datetime.datetime(1994, 4, 23, 9, 17, 42),
            friday_night_closing=datetime.time(23, 59, 59)
        )
        s2 = Store.objects.create(
            name='Books.com',
            original_opening=datetime.datetime(2001, 3, 15, 11, 23, 37),
            friday_night_closing=datetime.time(23, 59, 59)
        )
        s3 = Store.objects.create(
            name="Mamma and Pappa's Books",
            original_opening=datetime.datetime(1945, 4, 25, 16, 24, 14),
            friday_night_closing=datetime.time(21, 30)
        )
        s1.books.add(cls.b1, cls.b2, cls.b3, cls.b4, cls.b5, cls.b6)
        s2.books.add(cls.b1, cls.b3, cls.b5, cls.b6)
        s3.books.add(cls.b3, cls.b4, cls.b6)

    def test_basic_annotation(self):
        books = Book.objects.annotate(
            is_book=Value(1, output_field=IntegerField()))
        for book in books:
            self.assertEqual(book.is_book, 1)

    def test_basic_f_annotation(self):
        books = Book.objects.annotate(another_rating=F('rating'))
        for book in books:
            self.assertEqual(book.another_rating, book.rating)

    def test_joined_annotation(self):
        books = Book.objects.select_related('publisher').annotate(
            num_awards=F('publisher__num_awards'))
        for book in books:
            self.assertEqual(book.num_awards, book.publisher.num_awards)

    def test_annotate_with_aggregation(self):
        books = Book.objects.annotate(
            is_book=Value(1, output_field=IntegerField()),
            rating_count=Count('rating'))
        for book in books:
            self.assertEqual(book.is_book, 1)
            self.assertEqual(book.rating_count, 1)

    def test_aggregate_over_annotation(self):
        agg = Author.objects.annotate(other_age=F('age')).aggregate(otherage_sum=Sum('other_age'))
        other_agg = Author.objects.aggregate(age_sum=Sum('age'))
        self.assertEqual(agg['otherage_sum'], other_agg['age_sum'])

    def test_filter_annotation(self):
        books = Book.objects.annotate(
            is_book=Value(1, output_field=IntegerField())
        ).filter(is_book=1)
        for book in books:
            self.assertEqual(book.is_book, 1)

    def test_filter_annotation_with_f(self):
        books = Book.objects.annotate(
            other_rating=F('rating')
        ).filter(other_rating=3.5)
        for book in books:
            self.assertEqual(book.other_rating, 3.5)

    def test_filter_annotation_with_double_f(self):
        books = Book.objects.annotate(
            other_rating=F('rating')
        ).filter(other_rating=F('rating'))
        for book in books:
            self.assertEqual(book.other_rating, book.rating)

    def test_filter_agg_with_double_f(self):
        books = Book.objects.annotate(
            sum_rating=Sum('rating')
        ).filter(sum_rating=F('sum_rating'))
        for book in books:
            self.assertEqual(book.sum_rating, book.rating)

    def test_filter_wrong_annotation(self):
        with six.assertRaisesRegex(self, FieldError, "Cannot resolve keyword .*"):
            list(Book.objects.annotate(
                sum_rating=Sum('rating')
            ).filter(sum_rating=F('nope')))

    def test_update_with_annotation(self):
        book_preupdate = Book.objects.get(pk=self.b2.pk)
        Book.objects.annotate(other_rating=F('rating') - 1).update(rating=F('other_rating'))
        book_postupdate = Book.objects.get(pk=self.b2.pk)
        self.assertEqual(book_preupdate.rating - 1, book_postupdate.rating)

    def test_annotation_with_m2m(self):
        books = Book.objects.annotate(author_age=F('authors__age')).filter(pk=self.b1.pk).order_by('author_age')
        self.assertEqual(books[0].author_age, 34)
        self.assertEqual(books[1].author_age, 35)

    def test_annotation_reverse_m2m(self):
        books = Book.objects.annotate(
            store_name=F('store__name')).filter(
            name='Practical Django Projects').order_by(
            'store_name')

        self.assertQuerysetEqual(
            books, [
                'Amazon.com',
                'Books.com',
                'Mamma and Pappa\'s Books'
            ],
            lambda b: b.store_name
        )

    def test_values_annotation(self):
        """
        Annotations can reference fields in a values clause,
        and contribute to an existing values clause.
        """
        # annotate references a field in values()
        qs = Book.objects.values('rating').annotate(other_rating=F('rating') - 1)
        book = qs.get(pk=self.b1.pk)
        self.assertEqual(book['rating'] - 1, book['other_rating'])

        # filter refs the annotated value
        book = qs.get(other_rating=4)
        self.assertEqual(book['other_rating'], 4)

        # can annotate an existing values with a new field
        book = qs.annotate(other_isbn=F('isbn')).get(other_rating=4)
        self.assertEqual(book['other_rating'], 4)
        self.assertEqual(book['other_isbn'], '155860191')

    def test_defer_annotation(self):
        """
        Deferred attributes can be referenced by an annotation,
        but they are not themselves deferred, and cannot be deferred.
        """
        qs = Book.objects.defer('rating').annotate(other_rating=F('rating') - 1)

        with self.assertNumQueries(2):
            book = qs.get(other_rating=4)
            self.assertEqual(book.rating, 5)
            self.assertEqual(book.other_rating, 4)

        with six.assertRaisesRegex(self, FieldDoesNotExist, "\w has no field named u?'other_rating'"):
            book = qs.defer('other_rating').get(other_rating=4)

    def test_mti_annotations(self):
        """
        Fields on an inherited model can be referenced by an
        annotated field.
        """
        d = DepartmentStore.objects.create(
            name='Angus & Robinson',
            original_opening=datetime.date(2014, 3, 8),
            friday_night_closing=datetime.time(21, 00, 00),
            chain='Westfield'
        )

        books = Book.objects.filter(rating__gt=4)
        for b in books:
            d.books.add(b)

        qs = DepartmentStore.objects.annotate(
            other_name=F('name'),
            other_chain=F('chain'),
            is_open=Value(True, BooleanField()),
            book_isbn=F('books__isbn')
        ).order_by('book_isbn').filter(chain='Westfield')

        self.assertQuerysetEqual(
            qs, [
                ('Angus & Robinson', 'Westfield', True, '155860191'),
                ('Angus & Robinson', 'Westfield', True, '159059725')
            ],
            lambda d: (d.other_name, d.other_chain, d.is_open, d.book_isbn)
        )

    def test_null_annotation(self):
        """
        Test that annotating None onto a model round-trips
        """
        book = Book.objects.annotate(no_value=Value(None, output_field=IntegerField())).first()
        self.assertIsNone(book.no_value)

    def test_column_field_ordering(self):
        """
        Test that columns are aligned in the correct order for
        resolve_columns. This test will fail on mysql if column
        ordering is out. Column fields should be aligned as:
        1. extra_select
        2. model_fields
        3. annotation_fields
        4. model_related_fields
        """
        store = Store.objects.first()
        Employee.objects.create(id=1, first_name='Max', manager=True, last_name='Paine',
                                store=store, age=23, salary=Decimal(50000.00))
        Employee.objects.create(id=2, first_name='Buffy', manager=False, last_name='Summers',
                                store=store, age=18, salary=Decimal(40000.00))

        qs = Employee.objects.extra(
            select={'random_value': '42'}
        ).select_related('store').annotate(
            annotated_value=Value(17, output_field=IntegerField())
        )

        rows = [
            (1, 'Max', True, 42, 'Paine', 23, Decimal(50000.00), store.name, 17),
            (2, 'Buffy', False, 42, 'Summers', 18, Decimal(40000.00), store.name, 17)
        ]

        self.assertQuerysetEqual(
            qs.order_by('id'), rows,
            lambda e: (
                e.id, e.first_name, e.manager, e.random_value, e.last_name, e.age,
                e.salary, e.store.name, e.annotated_value))

    def test_column_field_ordering_with_deferred(self):
        store = Store.objects.first()
        Employee.objects.create(id=1, first_name='Max', manager=True, last_name='Paine',
                                store=store, age=23, salary=Decimal(50000.00))
        Employee.objects.create(id=2, first_name='Buffy', manager=False, last_name='Summers',
                                store=store, age=18, salary=Decimal(40000.00))

        qs = Employee.objects.extra(
            select={'random_value': '42'}
        ).select_related('store').annotate(
            annotated_value=Value(17, output_field=IntegerField())
        )

        rows = [
            (1, 'Max', True, 42, 'Paine', 23, Decimal(50000.00), store.name, 17),
            (2, 'Buffy', False, 42, 'Summers', 18, Decimal(40000.00), store.name, 17)
        ]

        # and we respect deferred columns!
        self.assertQuerysetEqual(
            qs.defer('age').order_by('id'), rows,
            lambda e: (
                e.id, e.first_name, e.manager, e.random_value, e.last_name, e.age,
                e.salary, e.store.name, e.annotated_value))

    @cxOracle_513_py3_bug
    def test_custom_functions(self):
        Company(name='Apple', motto=None, ticker_name='APPL', description='Beautiful Devices').save()
        Company(name='Django Software Foundation', motto=None, ticker_name=None, description=None).save()
        Company(name='Google', motto='Do No Evil', ticker_name='GOOG', description='Internet Company').save()
        Company(name='Yahoo', motto=None, ticker_name=None, description='Internet Company').save()

        qs = Company.objects.annotate(
            tagline=Func(
                F('motto'),
                F('ticker_name'),
                F('description'),
                Value('No Tag'),
                function='COALESCE')
            ).order_by('name')

        self.assertQuerysetEqual(
            qs, [
                ('Apple', 'APPL'),
                ('Django Software Foundation', 'No Tag'),
                ('Google', 'Do No Evil'),
                ('Yahoo', 'Internet Company')
            ],
            lambda c: (c.name, c.tagline)
        )

    @cxOracle_513_py3_bug
    def test_custom_functions_can_ref_other_functions(self):
        Company(name='Apple', motto=None, ticker_name='APPL', description='Beautiful Devices').save()
        Company(name='Django Software Foundation', motto=None, ticker_name=None, description=None).save()
        Company(name='Google', motto='Do No Evil', ticker_name='GOOG', description='Internet Company').save()
        Company(name='Yahoo', motto=None, ticker_name=None, description='Internet Company').save()

        class Lower(Func):
            function = 'LOWER'

        qs = Company.objects.annotate(
            tagline=Func(
                F('motto'),
                F('ticker_name'),
                F('description'),
                Value('No Tag'),
                function='COALESCE')
        ).annotate(
            tagline_lower=Lower(F('tagline'), output_field=CharField())
        ).order_by('name')

        # LOWER function supported by:
        # oracle, postgres, mysql, sqlite, sqlserver

        self.assertQuerysetEqual(
            qs, [
                ('Apple', 'APPL'.lower()),
                ('Django Software Foundation', 'No Tag'.lower()),
                ('Google', 'Do No Evil'.lower()),
                ('Yahoo', 'Internet Company'.lower())
            ],
            lambda c: (c.name, c.tagline_lower)
        )