from __future__ import absolute_import, unicode_literals

from django import forms
from django.contrib.contenttypes.generic import generic_inlineformset_factory
from django.contrib.contenttypes.models import ContentType
from django.test import TestCase

from .models import (TaggedItem, ValuableTaggedItem, Comparison, Animal,
                     Vegetable, Mineral, Gecko, Rock, ManualPK,
                     ForProxyModelModel, ForConcreteModelModel,
                     ProxyRelatedModel, ConcreteRelatedModel)


class GenericRelationsTests(TestCase):
    def test_generic_relations(self):
        # Create the world in 7 lines of code...
        lion = Animal.objects.create(common_name="Lion", latin_name="Panthera leo")
        platypus = Animal.objects.create(
            common_name="Platypus", latin_name="Ornithorhynchus anatinus"
        )
        eggplant = Vegetable.objects.create(name="Eggplant", is_yucky=True)
        bacon = Vegetable.objects.create(name="Bacon", is_yucky=False)
        quartz = Mineral.objects.create(name="Quartz", hardness=7)

        # Objects with declared GenericRelations can be tagged directly -- the
        # API mimics the many-to-many API.
        bacon.tags.create(tag="fatty")
        bacon.tags.create(tag="salty")
        lion.tags.create(tag="yellow")
        lion.tags.create(tag="hairy")
        platypus.tags.create(tag="fatty")
        self.assertQuerysetEqual(lion.tags.all(), [
            "<TaggedItem: hairy>",
            "<TaggedItem: yellow>"
        ])
        self.assertQuerysetEqual(bacon.tags.all(), [
            "<TaggedItem: fatty>",
            "<TaggedItem: salty>"
        ])

        # You can easily access the content object like a foreign key.
        t = TaggedItem.objects.get(tag="salty")
        self.assertEqual(t.content_object, bacon)

        # Recall that the Mineral class doesn't have an explicit GenericRelation
        # defined. That's OK, because you can create TaggedItems explicitly.
        tag1 = TaggedItem.objects.create(content_object=quartz, tag="shiny")
        tag2 = TaggedItem.objects.create(content_object=quartz, tag="clearish")

        # However, excluding GenericRelations means your lookups have to be a
        # bit more explicit.
        ctype = ContentType.objects.get_for_model(quartz)
        q = TaggedItem.objects.filter(
            content_type__pk=ctype.id, object_id=quartz.id
        )
        self.assertQuerysetEqual(q, [
            "<TaggedItem: clearish>",
            "<TaggedItem: shiny>"
        ])

        # You can set a generic foreign key in the way you'd expect.
        tag1.content_object = platypus
        tag1.save()
        self.assertQuerysetEqual(platypus.tags.all(), [
            "<TaggedItem: fatty>",
            "<TaggedItem: shiny>"
        ])
        q = TaggedItem.objects.filter(
            content_type__pk=ctype.id, object_id=quartz.id
        )
        self.assertQuerysetEqual(q, ["<TaggedItem: clearish>"])

        # Queries across generic relations respect the content types. Even
        # though there are two TaggedItems with a tag of "fatty", this query
        # only pulls out the one with the content type related to Animals.
        self.assertQuerysetEqual(Animal.objects.order_by('common_name'), [
            "<Animal: Lion>",
            "<Animal: Platypus>"
        ])
        # Create another fatty tagged instance with different PK to ensure
        # there is a content type restriction in the generated queries below.
        mpk = ManualPK.objects.create(id=lion.pk)
        mpk.tags.create(tag="fatty")
        self.assertQuerysetEqual(Animal.objects.filter(tags__tag='fatty'), [
            "<Animal: Platypus>"
        ])
        self.assertQuerysetEqual(Animal.objects.exclude(tags__tag='fatty'), [
            "<Animal: Lion>"
        ])
        mpk.delete()

        # If you delete an object with an explicit Generic relation, the related
        # objects are deleted when the source object is deleted.
        # Original list of tags:
        comp_func = lambda obj: (
            obj.tag, obj.content_type.model_class(), obj.object_id
        )

        self.assertQuerysetEqual(TaggedItem.objects.all(), [
                ('clearish', Mineral, quartz.pk),
                ('fatty', Animal, platypus.pk),
                ('fatty', Vegetable, bacon.pk),
                ('hairy', Animal, lion.pk),
                ('salty', Vegetable, bacon.pk),
                ('shiny', Animal, platypus.pk),
                ('yellow', Animal, lion.pk)
            ],