import os
from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession
from sqlalchemy.orm import declarative_base, sessionmaker

DATABASE_URL = os.getenv("DATABASE_URL", "postgresql+asyncpg://postgres:password@db:5432/cycling")

engine = create_async_engine(DATABASE_URL, echo=True)
AsyncSessionLocal = sessionmaker(
    bind=engine,
    class_=AsyncSession,
    expire_on_commit=False
)

Base = declarative_base()

async def get_db() -> AsyncSession:
    async with AsyncSessionLocal() as session:
        yield session