"""Unit tests for zero-argument super() & related machinery."""

import unittest


class A:
    def f(self):
        return 'A'
    @classmethod
    def cm(cls):
        return (cls, 'A')

class B(A):
    def f(self):
        return super().f() + 'B'
    @classmethod
    def cm(cls):
        return (cls, super().cm(), 'B')

class C(A):
    def f(self):
        return super().f() + 'C'
    @classmethod
    def cm(cls):
        return (cls, super().cm(), 'C')

class D(C, B):
    def f(self):
        return super().f() + 'D'
    def cm(cls):
        return (cls, super().cm(), 'D')

class E(D):
    pass

class F(E):
    f = E.f

class G(A):
    pass


class TestSuper(unittest.TestCase):

    # def tearDown(self):
    #     # This fixes the damage that test_various___class___pathologies does.
    #     nonlocal __class__
    #     __class__ = TestSuper

    def test_basics_working(self):
        self.assertEqual(D().f(), 'ABCD')

    def test_class_getattr_working(self):
        self.assertEqual(D.f(D()), 'ABCD')

    def test_subclass_no_override_working(self):
        self.assertEqual(E().f(), 'ABCD')
        self.assertEqual(E.f(E()), 'ABCD')

    def test_unbound_method_transfer_working(self):
        self.assertEqual(F().f(), 'ABCD')
        self.assertEqual(F.f(F()), 'ABCD')

    def test_class_methods_still_working(self):
        self.assertEqual(A.cm(), (A, 'A'))
        self.assertEqual(A().cm(), (A, 'A'))
        self.assertEqual(G.cm(), (G, 'A'))
        self.assertEqual(G().cm(), (G, 'A'))

    # def test_super_in_class_methods_working(self):
    #     d = D()
    #     self.assertEqual(d.cm(), (d, (D, (D, (D, 'A'), 'B'), 'C'), 'D'))
    #     e = E()
    #     self.assertEqual(e.cm(), (e, (E, (E, (E, 'A'), 'B'), 'C'), 'D'))

    # def test_super_with_closure(self):
    #     # Issue4360: super() did not work in a function that
    #     # contains a closure
    #     class E(A):
    #         def f(self):
    #             def nested():
    #                 self
    #             return super().f() + 'E'

    #     self.assertEqual(E().f(), 'AE')

    # def test_various___class___pathologies(self):
    #     # See issue #12370
    #     class X(A):
    #         def f(self):
    #             return super().f()
    #         __class__ = 413
    #     x = X()
    #     self.assertEqual(x.f(), 'A')
    #     self.assertEqual(x.__class__, 413)
    #     class X:
    #         x = __class__
    #         def f():
    #             __class__
    #     self.assertIs(X.x, type(self))
    #     # with self.assertRaises(NameError) as e:
    #     #     exec("""class X:
    #     #         __class__
    #     #         def f():
    #     #             __class__""", globals(), {})
    #     # self.assertIs(type(e.exception), NameError) # Not UnboundLocalError
    #     class X:
    #         global __class__
    #         __class__ = 42
    #         def f():
    #             __class__
    #     self.assertEqual(globals()["__class__"], 42)
    #     del globals()["__class__"]
    #     self.assertNotIn("__class__", X.__dict__)
    #     # class X:
    #     #     nonlocal __class__
    #     #     __class__ = 42
    #     #     def f():
    #     #         __class__
    #     # self.assertEqual(__class__, 42)

    # def test___class___instancemethod(self):
    #     # See issue #14857
    #     class X:
    #         def f(self):
    #             return __class__
    #     self.assertIs(X().f(), X)

    # def test___class___classmethod(self):
    #     # See issue #14857
    #     class X:
    #         @classmethod
    #         def f(cls):
    #             return __class__
    #     self.assertIs(X.f(), X)

    # def test___class___staticmethod(self):
    #     # See issue #14857
    #     class X:
    #         @staticmethod
    #         def f():
    #             return __class__
    #     self.assertIs(X.f(), X)

    # def test___class___new(self):
    #     # See issue #23722
    #     # Ensure zero-arg super() works as soon as type.__new__() is completed
    #     test_class = None

    #     class Meta(type):
    #         def __new__(cls, name, bases, namespace):
    #             nonlocal test_class
    #             self = super().__new__(cls, name, bases, namespace)
    #             test_class = self.f()
    #             return self

    #     class A(metaclass=Meta):
    #         @staticmethod
    #         def f():
    #             return __class__

    #     self.assertIs(test_class, A)

    # def test___class___delayed(self):
    #     # See issue #23722
    #     test_namespace = None

    #     class Meta(type):
    #         def __new__(cls, name, bases, namespace):
    #             nonlocal test_namespace
    #             test_namespace = namespace
    #             return None

    #     class A(metaclass=Meta):
    #         @staticmethod
    #         def f():
    #             return __class__

    #     self.assertIs(A, None)

    #     B = type("B", (), test_namespace)
    #     self.assertIs(B.f(), B)

    # def test___class___mro(self):
    #     # See issue #23722
    #     test_class = None

    #     class Meta(type):
    #         def mro(self):
    #             # self.f() doesn't work yet...
    #             self.__dict__["f"]()
    #             return super().mro()

    #     class A(metaclass=Meta):
    #         def f():
    #             nonlocal test_class
    #             test_class = __class__

    #     self.assertIs(test_class, A)

    # def test___classcell___expected_behaviour(self):
    #     # See issue #23722
    #     class Meta(type):
    #         def __new__(cls, name, bases, namespace):
    #             nonlocal namespace_snapshot
    #             namespace_snapshot = namespace.copy()
    #             return super().__new__(cls, name, bases, namespace)

    #     # __classcell__ is injected into the class namespace by the compiler
    #     # when at least one method needs it, and should be omitted otherwise
    #     namespace_snapshot = None
    #     class WithoutClassRef(metaclass=Meta):
    #         pass
    #     self.assertNotIn("__classcell__", namespace_snapshot)

    #     # With zero-arg super() or an explicit __class__ reference,
    #     # __classcell__ is the exact cell reference to be populated by
    #     # type.__new__
    #     namespace_snapshot = None
    #     class WithClassRef(metaclass=Meta):
    #         def f(self):
    #             return __class__

    #     class_cell = namespace_snapshot["__classcell__"]
    #     method_closure = WithClassRef.f.__closure__
    #     self.assertEqual(len(method_closure), 1)
    #     self.assertIs(class_cell, method_closure[0])
    #     # Ensure the cell reference *doesn't* get turned into an attribute
    #     with self.assertRaises(AttributeError):
    #         WithClassRef.__classcell__

    # def test___classcell___missing(self):
    #     # See issue #23722
    #     # Some metaclasses may not pass the original namespace to type.__new__
    #     # We test that case here by forcibly deleting __classcell__
    #     class Meta(type):
    #         def __new__(cls, name, bases, namespace):
    #             namespace.pop('__classcell__', None)
    #             return super().__new__(cls, name, bases, namespace)

    #     # The default case should continue to work without any errors
    #     class WithoutClassRef(metaclass=Meta):
    #         pass

    #     # With zero-arg super() or an explicit __class__ reference, we expect
    #     # __build_class__ to raise a RuntimeError complaining that
    #     # __class__ was not set, and asking if __classcell__ was propagated
    #     # to type.__new__.
    #     expected_error = '__class__ not set.*__classcell__ propagated'
    #     with self.assertRaisesRegex(RuntimeError, expected_error):
    #         class WithClassRef(metaclass=Meta):
    #             def f(self):
    #                 return __class__

    # def test___classcell___overwrite(self):
    #     # See issue #23722
    #     # Overwriting __classcell__ with nonsense is explicitly prohibited
    #     class Meta(type):
    #         def __new__(cls, name, bases, namespace, cell):
    #             namespace['__classcell__'] = cell
    #             return super().__new__(cls, name, bases, namespace)

    #     for bad_cell in (None, 0, "", object()):
    #         with self.subTest(bad_cell=bad_cell):
    #             with self.assertRaises(TypeError):
    #                 class A(metaclass=Meta, cell=bad_cell):
    #                     pass

    # def test___classcell___wrong_cell(self):
    #     # See issue #23722
    #     # Pointing the cell reference at the wrong class is also prohibited
    #     class Meta(type):
    #         def __new__(cls, name, bases, namespace):
    #             cls = super().__new__(cls, name, bases, namespace)
    #             B = type("B", (), namespace)
    #             return cls

    #     with self.assertRaises(TypeError):
    #         class A(metaclass=Meta):
    #             def f(self):
    #                 return __class__

    def test_obscure_super_errors(self):
        def f():
            super()
        self.assertRaises(RuntimeError, f)
        def f(x):
            del x
            super()
        self.assertRaises(RuntimeError, f, None)
        # class X:
        #     def f(x):
        #         nonlocal __class__
        #         del __class__
        #         super()
        # self.assertRaises(RuntimeError, X().f)

    # def test_cell_as_self(self):
    #     class X:
    #         def meth(self):
    #             super()

    #     def f():
    #         k = X()
    #         def g():
    #             return k
    #         return g
    #     c = f().__closure__[0]
    #     self.assertRaises(TypeError, X.meth, c)

    def test_super_init_leaks(self):
        # Issue #26718: super.__init__ leaked memory if called multiple times.
        # This will be caught by regrtest.py -R if this leak.
        # NOTE: Despite the use in the test a direct call of super.__init__
        # is not endorsed.
        sp = super(float, 1.0)
        for i in range(1000):
            super.__init__(sp, int, i)


if __name__ == "__main__":
    unittest.main()
