from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession
from sqlalchemy.orm import sessionmaker, declarative_base
from sqlalchemy import text
from backend.config import DATABASE_URL

engine = create_async_engine(DATABASE_URL, echo=False)
Base = declarative_base()

AsyncSessionLocal = sessionmaker(
    engine, class_=AsyncSession, expire_on_commit=False
)

async def get_db():
    async with AsyncSessionLocal() as session:
        try:
            yield session
        finally:
            await session.close()

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