from datetime import date, datetime, timedelta
from operator import attrgetter

from django.db import IntegrityError
from django.test import TestCase

from .models import (
    CustomMembership,
    Employee,
    Event,
    Friendship,
    Group,
    Ingredient,
    Invitation,
    Membership,
    Person,
    PersonChild,
    PersonSelfRefM2M,
    Recipe,
    RecipeIngredient,
    Relationship,
    SymmetricalFriendship,
)


class M2mThroughTests(TestCase):
    @classmethod
    def setUpTestData(cls):
        cls.bob = Person.objects.create(name="Bob")
        cls.jim = Person.objects.create(name="Jim")
        cls.jane = Person.objects.create(name="Jane")
        cls.rock = Group.objects.create(name="Rock")
        cls.roll = Group.objects.create(name="Roll")

    def test_reverse_inherited_m2m_with_through_fields_list_hashable(self):
        reverse_m2m = Person._meta.get_field("events_invited")
        self.assertEqual(reverse_m2m.through_fields, ["event", "invitee"])
        inherited_reverse_m2m = PersonChild._meta.get_field("events_invited")
        self.assertEqual(inherited_reverse_m2m.through_fields, ["event", "invitee"])
        self.assertEqual(hash(reverse_m2m), hash(inherited_reverse_m2m))

    def test_retrieve_intermediate_items(self):
        Membership.objects.create(person=self.jim, group=self.rock)
        Membership.objects.create(person=self.jane, group=self.rock)

        expected = ["Jane", "Jim"]
        self.assertQuerySetEqual(self.rock.members.all(), expected, attrgetter("name"))

    def test_get_on_intermediate_model(self):
        Membership.objects.create(person=self.jane, group=self.rock)

        queryset = Membership.objects.get(person=self.jane, group=self.rock)

        self.assertEqual(repr(queryset), "<Membership: Jane is a member of Rock>")

    def test_filter_on_intermediate_model(self):
        m1 = Membership.objects.create(person=self.jim, group=self.rock)
        m2 = Membership.objects.create(person=self.jane, group=self.rock)

        queryset = Membership.objects.filter(group=self.rock)

        self.assertSequenceEqual(queryset, [m1, m2])

    def test_add_on_m2m_with_intermediate_model(self):
        self.rock.members.add(
            self.bob, through_defaults={"invite_reason": "He is good."}
        )
        self.assertSequenceEqual(self.rock.members.all(), [self.bob])
        self.assertEqual(self.rock.membership_set.get().invite_reason, "He is good.")

    def test_add_on_m2m_with_intermediate_model_callable_through_default(self):
        def invite_reason_callable():
            return "They were good at %s" % datetime.now()

        self.rock.members.add(
            self.bob,
            self.jane,
            through_defaults={"invite_reason": invite_reason_callable},
        )
        self.assertSequenceEqual(self.rock.members.all(), [self.bob, self.jane])
        self.assertEqual(
            self.rock.membership_set.filter(
                invite_reason__startswith="They were good at ",
            ).count(),
            2,
        )
        # invite_reason_callable() is called once.
        self.assertEqual(
            self.bob.membership_set.get().invite_reason,
            self.jane.membership_set.get().invite_reason,
        )

    def test_set_on_m2m_with_intermediate_model_callable_through_default(self):
        self.rock.members.set(
            [self.bob, self.jane],
            through_defaults={"invite_reason": lambda: "Why not?"},
        )
        self.assertSequenceEqual(self.rock.members.all(), [self.bob, self.jane])
        self.assertEqual(
            self.rock.membership_set.filter(
                invite_reason__startswith="Why not?",
            ).count(),
            2,
        )

    def test_add_on_m2m_with_intermediate_model_value_required(self):
        self.rock.nodefaultsnonulls.add(
            self.jim, through_defaults={"nodefaultnonull": 1}
        )
        self.assertEqual(self.rock.testnodefaultsornulls_set.get().nodefaultnonull, 1)

    def test_add_on_m2m_with_intermediate_model_value_required_fails(self):
        with self.assertRaises(IntegrityError):
            self.rock.nodefaultsnonulls.add(self.jim)

    def test_create_on_m2m_with_intermediate_model(self):
        annie = self.rock.members.create(
            name="Annie", through_defaults={"invite_reason": "She was just awesome."}
        )
        self.assertSequenceEqual(self.rock.members.all(), [annie])
        self.assertEqual(
            self.rock.membership_set.get().invite_reason, "She was just awesome."
        )

    def test_create_on_m2m_with_intermediate_model_callable_through_default(self):
        annie = self.rock.members.create(
            name="Annie",
            through_defaults={"invite_reason": lambda: "She was just awesome."},
        )
        self.assertSequenceEqual(self.rock.members.all(), [annie])
        self.assertEqual(
            self.rock.membership_set.get().invite_reason,
            "She was just awesome.",
        )

    def test_create_on_m2m_with_intermediate_model_value_required(self):
        self.rock.nodefaultsnonulls.create(
            name="Test", through_defaults={"nodefaultnonull": 1}
        )
        self.assertEqual(self.rock.testnodefaultsornulls_set.get().nodefaultnonull, 1)

    def test_create_on_m2m_with_intermediate_model_value_required_fails(self):
        with self.assertRaises(IntegrityError):
            self.rock.nodefaultsnonulls.create(name="Test")

    def test_get_or_create_on_m2m_with_intermediate_model_value_required(self):
        self.rock.nodefaultsnonulls.get_or_create(
            name="Test", through_defaults={"nodefaultnonull": 1}
        )
        self.assertEqual(self.rock.testnodefaultsornulls_set.get().nodefaultnonull, 1)

    def test_get_or_create_on_m2m_with_intermediate_model_value_required_fails(self):
        with self.assertRaises(IntegrityError):
            self.rock.nodefaultsnonulls.get_or_create(name="Test")

    def test_update_or_create_on_m2m_with_intermediate_model_value_required(self):
        self.rock.nodefaultsnonulls.update_or_create(
            name="Test", through_defaults={"nodefaultnonull": 1}
        )
        self.assertEqual(self.rock.testnodefaultsornulls_set.get().nodefaultnonull, 1)

    def test_update_or_create_on_m2m_with_intermediate_model_value_required_fails(self):
        with self.assertRaises(IntegrityError):
            self.rock.nodefaultsnonulls.update_or_create(name="Test")

    def test_remove_on_m2m_with_intermediate_model(self):
        Membership.objects.create(person=self.jim, group=self.rock)
        self.rock.members.remove(self.jim)
        self.assertSequenceEqual(self.rock.members.all(), [])

    def test_remove_on_m2m_with_intermediate_model_multiple(self):
        Membership.objects.create(person=self.jim, group=self.rock, invite_reason="1")
        Membership.objects.create(person=self.jim, group=self.rock, invite_reason="2")
        self.assertSequenceEqual(self.rock.members.all(), [self.jim, self.jim])
        self.rock.members.remove(self.jim)
        self.assertSequenceEqual(self.rock.members.all(), [])

    def test_set_on_m2m_with_intermediate_model(self):
        members = list(Person.objects.filter(name__in=["Bob", "Jim"]))
        self.rock.members.set(members)
        self.assertSequenceEqual(self.rock.members.all(), [self.bob, self.jim])

    def test_set_on_m2m_with_intermediate_model_value_required(self):
        self.rock.nodefaultsnonulls.set(
            [self.jim], through_defaults={"nodefaultnonull": 1}
        )
        self.assertEqual(self.rock.testnodefaultsornulls_set.get().nodefaultnonull, 1)
        self.rock.nodefaultsnonulls.set(
            [self.jim], through_defaults={"nodefaultnonull": 2}
        )
        self.assertEqual(self.rock.testnodefaultsornulls_set.get().nodefaultnonull, 1)
        self.rock.nodefaultsnonulls.set(
            [self.jim], through_defaults={"nodefaultnonull": 2}, clear=True
        )
        self.assertEqual(self.rock.testnodefaultsornulls_set.get().nodefaultnonull, 2)

    def test_set_on_m2m_with_intermediate_model_value_required_fails(self):
        with self.assertRaises(IntegrityError):
            self.rock.nodefaultsnonulls.set([self.jim])

    def test_clear_removes_all_the_m2m_relationships(self):
        Membership.objects.create(person=self.jim, group=self.rock)
        Membership.objects.create(person=self.jane, group=self.rock)

        self.rock.members.clear()

        self.assertQuerySetEqual(self.rock.members.all(), [])

    def test_retrieve_reverse_intermediate_items(self):
        Membership.objects.create(person=self.jim, group=self.rock)
        Membership.objects.create(person=self.jim, group=self.roll)

        expected = ["Rock", "Roll"]
        self.assertQuerySetEqual(self.jim.group_set.all(), expected, attrgetter("name"))

    def test_add_on_reverse_m2m_with_intermediate_model(self):
        self.bob.group_set.add(self.rock)
        self.assertSequenceEqual(self.bob.group_set.all(), [self.rock])

    def test_create_on_reverse_m2m_with_intermediate_model(self):
        funk = self.bob.group_set.create(name="Funk")
        self.assertSequenceEqual(self.bob.group_set.all(), [funk])

    def test_remove_on_reverse_m2m_with_intermediate_model(self):
        Membership.objects.create(person=self.bob, group=self.rock)
        self.bob.group_set.remove(self.rock)
        self.assertSequenceEqual(self.bob.group_set.all(), [])

    def test_set_on_reverse_m2m_with_intermediate_model(self):
        members = list(Group.objects.filter(name__in=["Rock", "Roll"]))
        self.bob.group_set.set(members)
        self.assertSequenceEqual(self.bob.group_set.all(), [self.rock, self.roll])

    def test_clear_on_reverse_removes_all_the_m2m_relationships(self):
        Membership.objects.create(person=self.jim, group=self.rock)
        Membership.objects.create(person=self.jim, group=self.roll)

        self.jim.group_set.clear()

        self.assertQuerySetEqual(self.jim.group_set.all(), [])

    def test_query_model_by_attribute_name_of_related_model(self):
        Membership.objects.create(person=self.jim, group=self.rock)
        Membership.objects.create(person=self.jane, group=self.rock)
        Membership.objects.create(person=self.bob, group=self.roll)
        Membership.objects.create(person=self.jim, group=self.roll)
        Membership.objects.create(person=self.jane, group=self.roll)

        self.assertQuerySetEqual(
            Group.objects.filter(members__name="Bob"), ["Roll"], attrgetter("name")
        )

    def test_order_by_relational_field_through_model(self):
        today = datetime.now()
        yesterday = today - timedelta(days=1)
        CustomMembership.objects.create(
            person=self.jim, group=self.rock, date_joined=yesterday
        )
        CustomMembership.objects.create(
            person=self.bob, group=self.rock, date_joined=today
        )
        CustomMembership.objects.create(
            person=self.jane, group=self.roll, date_joined=yesterday
        )
        CustomMembership.objects.create(
            person=self.jim, group=self.roll, date_joined=today
        )
        self.assertSequenceEqual(
            self.rock.custom_members.order_by("custom_person_related_name"),
            [self.jim, self.bob],
        )
        self.assertSequenceEqual(
            self.roll.custom_members.order_by("custom_person_related_name"),
            [self.jane, self.jim],
        )

    def test_query_first_model_by_intermediate_model_attribute(self):
        Membership.objects.create(
            person=self.jane, group=self.roll, invite_reason="She was just awesome."
        )
        Membership.objects.create(
            person=self.jim, group=self.roll, invite_reason="He is good."
        )
        Membership.objects.create(person=self.bob, group=self.roll)

        qs = Group.objects.filter(membership__invite_reason="She was just awesome.")
        self.assertQuerySetEqual(qs, ["Roll"], attrgetter("name"))

    def test_query_second_model_by_intermediate_model_attribute(self):
        Membership.objects.create(
            person=self.jane, group=self.roll, invite_reason="She was just awesome."
        )
        Membership.objects.create(
            person=self.jim, group=self.roll, invite_reason="He is good."
        )
        Membership.objects.create(person=self.bob, group=self.roll)

        qs = Person.objects.filter(membership__invite_reason="She was just awesome.")
        self.assertQuerySetEqual(qs, ["Jane"], attrgetter("name"))

    def test_query_model_by_related_model_name(self):
        Membership.objects.create(person=self.jim, group=self.rock)
        Membership.objects.create(person=self.jane, group=self.rock)
        Membership.objects.create(person=self.bob, group=self.roll)
        Membership.objects.create(person=self.jim, group=self.roll)
        Membership.objects.create(person=self.jane, group=self.roll)

        self.assertQuerySetEqual(
            Person.objects.filter(group__name="Rock"),
            ["Jane", "Jim"],
            attrgetter("name"),
        )

    def test_query_model_by_custom_related_name(self):
        CustomMembership.objects.create(person=self.bob, group=self.rock)
        CustomMembership.objects.create(person=self.jim, group=self.rock)

        self.assertQuerySetEqual(
            Person.objects.filter(custom__name="Rock"),
            ["Bob", "Jim"],
            attrgetter("name"),
        )

    def test_query_model_by_intermediate_can_return_non_unique_queryset(self):
        Membership.objects.create(person=self.jim, group=self.rock)
        Membership.objects.create(
            person=self.jane, group=self.rock, date_joined=datetime(2006, 1, 1)
        )
        Membership.objects.create(
            person=self.bob, group=self.roll, date_joined=datetime(2004, 1, 1)
        )
        Membership.objects.create(person=self.jim, group=self.roll)
        Membership.objects.create(
            person=self.jane, group=self.roll, date_joined=datetime(2004, 1, 1)
        )

        qs = Person.objects.filter(membership__date_joined__gt=datetime(2004, 1, 1))
        self.assertQuerySetEqual(qs, ["Jane", "Jim", "Jim"], attrgetter("name"))

    def test_custom_related_name_forward_empty_qs(self):
        self.assertQuerySetEqual(self.rock.custom_members.all(), [])

    def test_custom_related_name_reverse_empty_qs(self):
        self.assertQuerySetEqual(self.bob.custom.all(), [])

    def test_custom_related_name_forward_non_empty_qs(self):
        CustomMembership.objects.create(person=self.bob, group=self.rock)
        CustomMembership.objects.create(person=self.jim, group=self.rock)

        self.assertQuerySetEqual(
            self.rock.custom_members.all(), ["Bob", "Jim"], attrgetter("name")
        )

    def test_custom_related_name_reverse_non_empty_qs(self):
        CustomMembership.objects.create(person=self.bob, group=self.rock)
        CustomMembership.objects.create(person=self.jim, group=self.rock)

        self.assertQuerySetEqual(self.bob.custom.all(), ["Rock"], attrgetter("name"))

    def test_custom_related_name_doesnt_conflict_with_fky_related_name(self):
        c = CustomMembership.objects.create(person=self.bob, group=self.rock)
        self.assertSequenceEqual(self.bob.custom_person_related_name.all(), [c])

    def test_through_fields(self):
        """
        Relations with intermediary tables with multiple FKs
        to the M2M's ``to`` model are possible.
        """
        event = Event.objects.create(title="Rockwhale 2014")
        Invitation.objects.create(event=event, inviter=self.bob, invitee=self.jim)
        Invitation.objects.create(event=event, inviter=self.bob, invitee=self.jane)
        self.assertQuerySetEqual(
            event.invitees.all(), ["Jane", "Jim"], attrgetter("name")
        )


class M2mThroughReferentialTests(TestCase):
    def test_self_referential_empty_qs(self):
        tony = PersonSelfRefM2M.objects.create(name="Tony")
        self.assertQuerySetEqual(tony.friends.all(), [])

    def test_self_referential_non_symmetrical_first_side(self):
        tony = PersonSelfRefM2M.objects.create(name="Tony")
        chris = PersonSelfRefM2M.objects.create(name="Chris")
        Friendship.objects.create(
            first=tony, second=chris, date_friended=datetime.now()
        )

        self.assertQuerySetEqual(tony.friends.all(), ["Chris"], attrgetter("name"))

    def test_self_referential_non_symmetrical_second_side(self):
        tony = PersonSelfRefM2M.objects.create(name="Tony")
        chris = PersonSelfRefM2M.objects.create(name="Chris")
        Friendship.objects.create(
            first=tony, second=chris, date_friended=datetime.now()
        )

        self.assertQuerySetEqual(chris.friends.all(), [])

    def test_self_referential_non_symmetrical_clear_first_side(self):
        tony = PersonSelfRefM2M.objects.create(name="Tony")
        chris = PersonSelfRefM2M.objects.create(name="Chris")
        Friendship.objects.create(
            first=tony, second=chris, date_friended=datetime.now()
        )

        chris.friends.clear()

        self.assertQuerySetEqual(chris.friends.all(), [])

        # Since this isn't a symmetrical relation, Tony's friend link still
        # exists.
        self.assertQuerySetEqual(tony.friends.all(), ["Chris"], attrgetter("name"))

    def test_self_referential_non_symmetrical_both(self):
        tony = PersonSelfRefM2M.objects.create(name="Tony")
        chris = PersonSelfRefM2M.objects.create(name="Chris")
        Friendship.objects.create(
            first=tony, second=chris, date_friended=datetime.now()
        )
        Friendship.objects.create(
            first=chris, second=tony, date_friended=datetime.now()
        )

        self.assertQuerySetEqual(tony.friends.all(), ["Chris"], attrgetter("name"))

        self.assertQuerySetEqual(chris.friends.all(), ["Tony"], attrgetter("name"))

    def test_through_fields_self_referential(self):
        john = Employee.objects.create(name="john")
        peter = Employee.objects.create(name="peter")
        mary = Employee.objects.create(name="mary")
        harry = Employee.objects.create(name="harry")

        Relationship.objects.create(source=john, target=peter, another=None)
        Relationship.objects.create(source=john, target=mary, another=None)
        Relationship.objects.create(source=john, target=harry, another=peter)

        self.assertQuerySetEqual(
            john.subordinates.all(), ["peter", "mary", "harry"], attrgetter("name")
        )

    def test_self_referential_symmetrical(self):
        tony = PersonSelfRefM2M.objects.create(name="Tony")
        chris = PersonSelfRefM2M.objects.create(name="Chris")
        SymmetricalFriendship.objects.create(
            first=tony,
            second=chris,
            date_friended=date.today(),
        )
        self.assertSequenceEqual(tony.sym_friends.all(), [chris])
        # Manually created symmetrical m2m relation doesn't add mirror entry
        # automatically.
        self.assertSequenceEqual(chris.sym_friends.all(), [])
        SymmetricalFriendship.objects.create(
            first=chris, second=tony, date_friended=date.today()
        )
        self.assertSequenceEqual(chris.sym_friends.all(), [tony])

    def test_add_on_symmetrical_m2m_with_intermediate_model(self):
        tony = PersonSelfRefM2M.objects.create(name="Tony")
        chris = PersonSelfRefM2M.objects.create(name="Chris")
        date_friended = date(2017, 1, 3)
        tony.sym_friends.add(chris, through_defaults={"date_friended": date_friended})
        self.assertSequenceEqual(tony.sym_friends.all(), [chris])
        self.assertSequenceEqual(chris.sym_friends.all(), [tony])
        friendship = tony.symmetricalfriendship_set.get()
        self.assertEqual(friendship.date_friended, date_friended)

    def test_set_on_symmetrical_m2m_with_intermediate_model(self):
        tony = PersonSelfRefM2M.objects.create(name="Tony")
        chris = PersonSelfRefM2M.objects.create(name="Chris")
        anne = PersonSelfRefM2M.objects.create(name="Anne")
        kate = PersonSelfRefM2M.objects.create(name="Kate")
        date_friended_add = date(2013, 1, 5)
        date_friended_set = date.today()
        tony.sym_friends.add(
            anne,
            chris,
            through_defaults={"date_friended": date_friended_add},
        )
        tony.sym_friends.set(
            [anne, kate],
            through_defaults={"date_friended": date_friended_set},
        )
        self.assertSequenceEqual(tony.sym_friends.all(), [anne, kate])
        self.assertSequenceEqual(anne.sym_friends.all(), [tony])
        self.assertSequenceEqual(kate.sym_friends.all(), [tony])
        self.assertEqual(
            kate.symmetricalfriendship_set.get().date_friended,
            date_friended_set,
        )
        # Date is preserved.
        self.assertEqual(
            anne.symmetricalfriendship_set.get().date_friended,
            date_friended_add,
        )
        # Recreate relationship.
        tony.sym_friends.set(
            [anne],
            clear=True,
            through_defaults={"date_friended": date_friended_set},
        )
        self.assertSequenceEqual(tony.sym_friends.all(), [anne])
        self.assertSequenceEqual(anne.sym_friends.all(), [tony])
        self.assertEqual(
            anne.symmetricalfriendship_set.get().date_friended,
            date_friended_set,
        )


class M2mThroughToFieldsTests(TestCase):
    @classmethod
    def setUpTestData(cls):
        cls.pea = Ingredient.objects.create(iname="pea")
        cls.potato = Ingredient.objects.create(iname="potato")
        cls.tomato = Ingredient.objects.create(iname="tomato")
        cls.curry = Recipe.objects.create(rname="curry")
        RecipeIngredient.objects.create(recipe=cls.curry, ingredient=cls.potato)
        RecipeIngredient.objects.create(recipe=cls.curry, ingredient=cls.pea)
        RecipeIngredient.objects.create(recipe=cls.curry, ingredient=cls.tomato)

    def test_retrieval(self):
        # Forward retrieval
        self.assertSequenceEqual(
            self.curry.ingredients.all(), [self.pea, self.potato, self.tomato]
        )
        # Backward retrieval
        self.assertEqual(self.tomato.recipes.get(), self.curry)

    def test_choices(self):
        field = Recipe._meta.get_field("ingredients")
        self.assertEqual(
            [choice[0] for choice in field.get_choices(include_blank=False)],
            ["pea", "potato", "tomato"],
        )

    def test_count(self):
        self.assertEqual(self.curry.ingredients.count(), 3)
        self.assertEqual(self.tomato.recipes.count(), 1)

    def test_exists(self):
        self.assertTrue(self.curry.ingredients.exists())
        self.assertTrue(self.tomato.recipes.exists())
