import inspect
import types
import unittest
import contextlib
from test.support.import_helper import import_module
from test.support import gc_collect, requires_working_socket


class AsyncGenTest(unittest.TestCase):

    def compare_generators(self, sync_gen, async_gen):
        def sync_iterate(g):
            res = []
            while True:
                try:
                    res.append(g.__next__())
                except StopIteration:
                    res.append('STOP')
                    break
                except Exception as ex:
                    res.append(str(type(ex)))
            return res

        def async_iterate(g):
            res = []
            while True:
                an = g.__anext__()
                try:
                    while True:
                        try:
                            an.__next__()
                        except StopIteration as ex:
                            if ex.args:
                                res.append(ex.args[0])
                                break
                            else:
                                res.append('EMPTY StopIteration')
                                break
                        except StopAsyncIteration:
                            raise
                        except Exception as ex:
                            res.append(str(type(ex)))
                            break
                except StopAsyncIteration:
                    res.append('STOP')
                    break
            return res

        sync_gen_result = sync_iterate(sync_gen)
        async_gen_result = async_iterate(async_gen)
        self.assertEqual(sync_gen_result, async_gen_result)
        return async_gen_result

    def test_async_gen_iteration_01(self):
        async def gen():
            await awaitable()
            a = yield 123
            self.assertIs(a, None)
            await awaitable()
            yield 456
            await awaitable()
            yield 789

        self.assertEqual(to_list(gen()), [123, 456, 789])

    def test_async_gen_iteration_02(self):
        async def gen():
            await awaitable()
            yield 123
            await awaitable()

        g = gen()
        ai = g.__aiter__()

        an = ai.__anext__()
        self.assertEqual(an.__next__(), ('result',))

        try:
            an.__next__()
        except StopIteration as ex:
            self.assertEqual(ex.args[0], 123)
        else:
            self.fail('StopIteration was not raised')

        an = ai.__anext__()
        self.assertEqual(an.__next__(), ('result',))

        try:
            an.__next__()
        except StopAsyncIteration as ex:
            self.assertFalse(ex.args)
        else:
            self.fail('StopAsyncIteration was not raised')

    def test_async_gen_exception_03(self):
        async def gen():
            await awaitable()
            yield 123
            await awaitable(throw=True)
            yield 456

        with self.assertRaises(AwaitException):
            to_list(gen())

    def test_async_gen_exception_04(self):
        async def gen():
            await awaitable()
            yield 123
            1 / 0

        g = gen()
        ai = g.__aiter__()
        an = ai.__anext__()
        self.assertEqual(an.__next__(), ('result',))

        try:
            an.__next__()
        except StopIteration as ex:
            self.assertEqual(ex.args[0], 123)
        else:
            self.fail('StopIteration was not raised')

        with self.assertRaises(ZeroDivisionError):
            ai.__anext__().__next__()

    def test_async_gen_exception_05(self):
        async def gen():
            yield 123
            raise StopAsyncIteration

        with self.assertRaisesRegex(RuntimeError,
                                    'async generator.*StopAsyncIteration'):
            to_list(gen())

    def test_async_gen_exception_06(self):
        async def gen():
            yield 123
            raise StopIteration

        with self.assertRaisesRegex(RuntimeError,
                                    'async generator.*StopIteration'):
            to_list(gen())

    def test_async_gen_exception_07(self):
        def sync_gen():
            try:
                yield 1
                1 / 0
            finally:
                yield 2
                yield 3

            yield 100

        async def async_gen():
            try:
                yield 1
                1 / 0
            finally:
                yield 2
                yield 3

            yield 100

        self.compare_generators(sync_gen(), async_gen())

    def test_async_gen_exception_08(self):
        def sync_gen():
            try:
                yield 1
            finally:
                yield 2
                1 / 0
                yield 3

            yield 100

        async def async_gen():
            try:
                yield 1
                await awaitable()
            finally:
                await awaitable()
                yield 2
                1 / 0
                yield 3

            yield 100

        self.compare_generators(sync_gen(), async_gen())

    def test_async_gen_exception_09(self):
        def sync_gen():
            try:
                yield 1
                1 / 0
            finally:
                yield 2
                yield 3

            yield 100

        async def async_gen():
            try:
                await awaitable()
                yield 1
                1 / 0
            finally:
                yield 2
                await awaitable()
                yield 3

            yield 100

        self.compare_generators(sync_gen(), async_gen())

    def test_async_gen_exception_10(self):
        async def gen():
            yield 123
        with self.assertRaisesRegex(TypeError,
                                    "non-None value .* async generator"):
            gen().__anext__().send(100)

    def test_async_gen_exception_11(self):
        def sync_gen():
            yield 10
            yield 20

        def sync_gen_wrapper():
            yield 1
            sg = sync_gen()
            sg.send(None)
            try:
                sg.throw(GeneratorExit())
            except GeneratorExit:
                yield 2
            yield 3

        async def async_gen():
            yield 10
            yield 20

        async def async_gen_wrapper():
            yield 1
            asg = async_gen()
            await asg.asend(None)
            try:
                await asg.athrow(GeneratorExit())
            except GeneratorExit:
                yield 2
            yield 3

        self.compare_generators(sync_gen_wrapper(), async_gen_wrapper())

    def test_async_gen_exception_12(self):
        async def gen():
            with self.assertWarnsRegex(RuntimeWarning,
                    f"coroutine method 'asend' of '{gen.__qualname__}' "
                    f"was never awaited"):
                await anext(me)
            yield 123

        me = gen()
        ai = me.__aiter__()
        an = ai.__anext__()

        with self.assertRaisesRegex(RuntimeError,
                r'anext\(\): asynchronous generator is already running'):
            an.__next__()

        with self.assertRaisesRegex(RuntimeError,
                r"cannot reuse already awaited __anext__\(\)/asend\(\)"):
            an.send(None)

    def test_async_gen_asend_throw_concurrent_with_send(self):
        import types

        @types.coroutine
        def _async_yield(v):
            return (yield v)

        class MyExc(Exception):
            pass

        async def agenfn():
            while True:
                try:
                    await _async_yield(None)
                except MyExc:
                    pass
            return
            yield


        agen = agenfn()
        gen = agen.asend(None)
        gen.send(None)
        gen2 = agen.asend(None)

        with self.assertRaisesRegex(RuntimeError,
                r'anext\(\): asynchronous generator is already running'):
            gen2.throw(MyExc)

        with self.assertRaisesRegex(RuntimeError,
                r"cannot reuse already awaited __anext__\(\)/asend\(\)"):
            gen2.send(None)

    def test_async_gen_athrow_throw_concurrent_with_send(self):
        import types

        @types.coroutine
        def _async_yield(v):
            return (yield v)

        class MyExc(Exception):
            pass

        async def agenfn():
            while True:
                try:
                    await _async_yield(None)
                except MyExc:
                    pass
            return
            yield


        agen = agenfn()
        gen = agen.asend(None)
        gen.send(None)
        gen2 = agen.athrow(MyExc)

        with self.assertRaisesRegex(RuntimeError,
                r'athrow\(\): asynchronous generator is already running'):
            gen2.throw(MyExc)

        with self.assertRaisesRegex(RuntimeError,
                r"cannot reuse already awaited aclose\(\)/athrow\(\)"):
            gen2.send(None)

    def test_async_gen_asend_throw_concurrent_with_throw(self):
        import types

        @types.coroutine
        def _async_yield(v):
            return (yield v)

        class MyExc(Exception):
            pass

        async def agenfn():
            try:
                yield
            except MyExc:
                pass
            while True:
                try:
                    await _async_yield(None)
                except MyExc:
                    pass


        agen = agenfn()
        with self.assertRaises(StopIteration):
            agen.asend(None).send(None)

        gen = agen.athrow(MyExc)
        gen.throw(MyExc)
        gen2 = agen.asend(MyExc)

        with self.assertRaisesRegex(RuntimeError,
                r'anext\(\): asynchronous generator is already running'):
            gen2.throw(MyExc)

        with self.assertRaisesRegex(RuntimeError,
                r"cannot reuse already awaited __anext__\(\)/asend\(\)"):
            gen2.send(None)

    def test_async_gen_athrow_throw_concurrent_with_throw(self):
        import types

        @types.coroutine
        def _async_yield(v):
            return (yield v)

        class MyExc(Exception):
            pass

        async def agenfn():
            try:
                yield
            except MyExc:
                pass
            while True:
                try:
                    await _async_yield(None)
                except MyExc:
                    pass

        agen = agenfn()
        with self.assertRaises(StopIteration):
            agen.asend(None).send(None)

        gen = agen.athrow(MyExc)
        gen.throw(MyExc)
        gen2 = agen.athrow(None)

        with self.assertRaisesRegex(RuntimeError,
                r'athrow\(\): asynchronous generator is already running'):
            gen2.throw(MyExc)

        with self.assertRaisesRegex(RuntimeError,
                r"cannot reuse already awaited aclose\(\)/athrow\(\)"):
            gen2.send(None)

    def test_async_gen_3_arg_deprecation_warning(self):
        async def gen():
            yield 123

        with self.assertWarns(DeprecationWarning):
            x = gen().athrow(GeneratorExit, GeneratorExit(), None)
        with self.assertRaises(GeneratorExit):
            x.send(None)
            del x
            gc_collect()

    def test_async_gen_api_01(self):
        async def gen():
            yield 123

        g = gen()

        self.assertEqual(g.__name__, 'gen')
        g.__name__ = '123'
        self.assertEqual(g.__name__, '123')

        self.assertIn('.gen', g.__qualname__)
        g.__qualname__ = '123'
        self.assertEqual(g.__qualname__, '123')

        self.assertIsNone(g.ag_await)
        self.assertIsInstance(g.ag_frame, types.FrameType)
        self.assertFalse(g.ag_running)
        self.assertIsInstance(g.ag_code, types.CodeType)
        aclose = g.aclose()
        self.assertTrue(inspect.isawaitable(aclose))
        aclose.close()

    def test_async_gen_asend_close_runtime_error(self):
        import types

        @types.coroutine
        def _async_yield(v):
            return (yield v)

        async def agenfn():
            try:
                await _async_yield(None)
            except GeneratorExit:
                await _async_yield(None)
            return
            yield

        agen = agenfn()
        gen = agen.asend(None)
        gen.send(None)
        with self.assertRaisesRegex(RuntimeError, "coroutine ignored GeneratorExit"):
            gen.close()

    def test_async_gen_athrow_close_runtime_error(self):
        import types

        @types.coroutine
        def _async_yield(v):
            return (yield v)

        class MyExc(Exception):
            pass

        async def agenfn():
            try:
                yield
            except MyExc:
                try:
                    await _async_yield(None)
                except GeneratorExit:
                    await _async_yield(None)

        agen = agenfn()
        with self.assertRaises(StopIteration):
            agen.asend(None).send(None)
        gen = agen.athrow(MyExc)
        gen.send(None)
        with self.assertRaisesRegex(RuntimeError, "coroutine ignored GeneratorExit"):
            gen.close()