from sqlalchemy.ext.asyncio import create_async_engine, async_sessionmaker, AsyncSession
from sqlalchemy.orm import DeclarativeBase
import os

DATABASE_URL = os.getenv("DATABASE_URL", "postgresql+asyncpg://pokedexter:pokedexter_secret@db/pokedexter")

engine = create_async_engine(DATABASE_URL, echo=False)
async_session = async_sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)


class Base(DeclarativeBase):
    pass


async def get_db():
    async with async_session() as session:
        yield session