from asyncio import current_task
from typing import AsyncGenerator

from core.config import settings
from opentelemetry.instrumentation.sqlalchemy import SQLAlchemyInstrumentor
from sqlalchemy import create_engine
from sqlalchemy.ext.asyncio import (
    AsyncSession,
    async_scoped_session,
    create_async_engine,
)
from sqlalchemy.orm import sessionmaker

async_engine = create_async_engine(
    settings.SQLALCHEMY_TEST_ASYNC_DATABASE_URI
    if settings.TESTING
    else settings.SQLALCHEMY_ASYNC_DATABASE_URI,
    pool_pre_ping=True,
    echo=False,
    future=True,
)
# async_session_factory can be used directly using: async with async_session_factory() as session: ...
async_session_factory = sessionmaker(
    bind=async_engine, expire_on_commit=False, autoflush=False, class_=AsyncSession
)
AsyncSessionScoped = async_scoped_session(async_session_factory, scopefunc=current_task)

engine = create_engine(settings.SQLALCHEMY_DATABASE_URI)
SQLAlchemyInstrumentor().instrument(
    engine=engine,
)

#  Async Dependency
async def get_session() -> AsyncGenerator:
    async with async_session_factory() as session:
        yield session


# or
async def get_db() -> AsyncGenerator:
    session = async_session_factory()
    try:
        yield session
        await session.commit()
    except async_session_factory as ex:
        await session.rollback()
        raise ex
    finally:
        await session.close()