from django.db.models import BooleanField, Exists, F, OuterRef, Q
from django.db.models.expressions import RawSQL
from django.test import SimpleTestCase

from .models import Tag


class QTests(SimpleTestCase):
    def test_combine_and_empty(self):
        q = Q(x=1)
        self.assertEqual(q & Q(), q)
        self.assertEqual(Q() & q, q)

        q = Q(x__in={}.keys())
        self.assertEqual(q & Q(), q)
        self.assertEqual(Q() & q, q)

    def test_combine_and_both_empty(self):
        self.assertEqual(Q() & Q(), Q())

    def test_combine_or_empty(self):
        q = Q(x=1)
        self.assertEqual(q | Q(), q)
        self.assertEqual(Q() | q, q)

        q = Q(x__in={}.keys())
        self.assertEqual(q | Q(), q)
        self.assertEqual(Q() | q, q)

    def test_combine_empty_copy(self):
        base_q = Q(x=1)
        tests = [
            base_q | Q(),
            Q() | base_q,
            base_q & Q(),
            Q() & base_q,
        ]
        for i, q in enumerate(tests):
            with self.subTest(i=i):
                self.assertEqual(q, base_q)
                self.assertIsNot(q, base_q)

    def test_combine_or_both_empty(self):
        self.assertEqual(Q() | Q(), Q())

    def test_combine_not_q_object(self):
        obj = object()
        q = Q(x=1)
        with self.assertRaisesMessage(TypeError, str(obj)):
            q | obj
        with self.assertRaisesMessage(TypeError, str(obj)):
            q & obj

    def test_combine_negated_boolean_expression(self):
        tagged = Tag.objects.filter(category=OuterRef("pk"))
        tests = [
            Q() & ~Exists(tagged),
            Q() | ~Exists(tagged),
        ]
        for q in tests:
            with self.subTest(q=q):
                self.assertIs(q.negated, True)

    def test_deconstruct(self):
        q = Q(price__gt=F("discounted_price"))
        path, args, kwargs = q.deconstruct()
        self.assertEqual(path, "django.db.models.Q")
        self.assertEqual(args, (("price__gt", F("discounted_price")),))
        self.assertEqual(kwargs, {})

    def test_deconstruct_negated(self):
        q = ~Q(price__gt=F("discounted_price"))
        path, args, kwargs = q.deconstruct()
        self.assertEqual(args, (("price__gt", F("discounted_price")),))
        self.assertEqual(kwargs, {"_negated": True})

    def test_deconstruct_or(self):
        q1 = Q(price__gt=F("discounted_price"))
        q2 = Q(price=F("discounted_price"))
        q = q1 | q2
        path, args, kwargs = q.deconstruct()
        self.assertEqual(
            args,
            (
                ("price__gt", F("discounted_price")),
                ("price", F("discounted_price")),
            ),
        )
        self.assertEqual(kwargs, {"_connector": "OR"})

    def test_deconstruct_and(self):
        q1 = Q(price__gt=F("discounted_price"))
        q2 = Q(price=F("discounted_price"))
        q = q1 & q2
        path, args, kwargs = q.deconstruct()
        self.assertEqual(
            args,
            (
                ("price__gt", F("discounted_price")),
                ("price", F("discounted_price")),
            ),
        )
        self.assertEqual(kwargs, {})

    def test_deconstruct_multiple_kwargs(self):
        q = Q(price__gt=F("discounted_price"), price=F("discounted_price"))
        path, args, kwargs = q.deconstruct()
        self.assertEqual(
            args,
            (
                ("price", F("discounted_price")),
                ("price__gt", F("discounted_price")),
            ),
        )
        self.assertEqual(kwargs, {})

    def test_deconstruct_nested(self):
        q = Q(Q(price__gt=F("discounted_price")))
        path, args, kwargs = q.deconstruct()
        self.assertEqual(args, (Q(price__gt=F("discounted_price")),))
        self.assertEqual(kwargs, {})

    def test_deconstruct_boolean_expression(self):
        expr = RawSQL("1 = 1", BooleanField())
        q = Q(expr)
        _, args, kwargs = q.deconstruct()
        self.assertEqual(args, (expr,))
        self.assertEqual(kwargs, {})

    def test_reconstruct(self):
        q = Q(price__gt=F("discounted_price"))
        path, args, kwargs = q.deconstruct()
        self.assertEqual(Q(*args, **kwargs), q)

    def test_reconstruct_negated(self):
        q = ~Q(price__gt=F("discounted_price"))
        path, args, kwargs = q.deconstruct()
        self.assertEqual(Q(*args, **kwargs), q)

    def test_reconstruct_or(self):
        q1 = Q(price__gt=F("discounted_price"))
        q2 = Q(price=F("discounted_price"))
        q = q1 | q2
        path, args, kwargs = q.deconstruct()
        self.assertEqual(Q(*args, **kwargs), q)

    def test_reconstruct_and(self):
        q1 = Q(price__gt=F("discounted_price"))
        q2 = Q(price=F("discounted_price"))
        q = q1 & q2
        path, args, kwargs = q.deconstruct()
        self.assertEqual(Q(*args, **kwargs), q)