from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession, async_sessionmaker
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker

from app.configs import settings
from .models import Base


# Async engine for FastAPI
async_engine = create_async_engine(
    settings.database_url,
    pool_size=settings.database_pool_size,
    echo=settings.debug,
)

AsyncSessionLocal = async_sessionmaker(
    bind=async_engine,
    class_=AsyncSession,
    expire_on_commit=False,
)


async def get_db():
    async with AsyncSessionLocal() as session:
        try:
            yield session
            await session.commit()
        except Exception:
            await session.rollback()
            raise


async def init_db():
    async with async_engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)