import sqlalchemy as sa
from sqlalchemy import func
from sqlalchemy import select
from sqlalchemy import testing
from sqlalchemy.ext.asyncio import async_scoped_session
from sqlalchemy.ext.asyncio import AsyncSession as _AsyncSession
from sqlalchemy.orm import sessionmaker
from sqlalchemy.testing import async_test
from sqlalchemy.testing import eq_
from sqlalchemy.testing import is_
from .test_session_py3k import AsyncFixture


class AsyncScopedSessionTest(AsyncFixture):
    @testing.requires.python37
    @async_test
    async def test_basic(self, async_engine):
        from asyncio import current_task

        AsyncSession = async_scoped_session(
            sa.orm.sessionmaker(async_engine, class_=_AsyncSession),
            scopefunc=current_task,
        )

        some_async_session = AsyncSession()
        some_other_async_session = AsyncSession()

        is_(some_async_session, some_other_async_session)
        is_(some_async_session.bind, async_engine)

        User = self.classes.User

        async with AsyncSession.begin():
            user_name = "scoped_async_session_u1"
            u1 = User(name=user_name)

            AsyncSession.add(u1)

            await AsyncSession.flush()

            conn = await AsyncSession.connection()
            stmt = select(func.count(User.id)).where(User.name == user_name)
            eq_(await conn.scalar(stmt), 1)

            await AsyncSession.delete(u1)
            await AsyncSession.flush()
            eq_(await conn.scalar(stmt), 0)

    @testing.requires.python37
    def test_attributes(self, async_engine):
        from asyncio import current_task

        expected = [
            name
            for cls in _AsyncSession.mro()
            for name in vars(cls)
            if not name.startswith("_")
        ]

        ignore_list = {
            "dispatch",
            "sync_session_class",
            "run_sync",
            "get_transaction",
            "get_nested_transaction",
            "in_transaction",
            "in_nested_transaction",
        }

        SM = async_scoped_session(
            sessionmaker(async_engine, class_=_AsyncSession), current_task
        )

        missing = [
            name
            for name in expected
            if not hasattr(SM, name) and name not in ignore_list
        ]
        eq_(missing, [])
