from sqlalchemy.ext.asyncio import create_async_engine, async_sessionmaker, AsyncSession
from sqlalchemy.orm import declarative_base
from config import DATABASE_URL

engine = create_async_engine(
    DATABASE_URL,
    echo=True,
    pool_size=5,
    max_overflow=10,
)

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

Base = declarative_base()

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

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