from contextlib import (AbstractContextManager, asynccontextmanager,
                        contextmanager)
from typing import Callable

from sqlalchemy.ext.asyncio import (AsyncSession, async_sessionmaker,
                                    create_async_engine)
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import Session

Base = declarative_base()


class Database:
    def __init__(self, db_url: str) -> None:
        self._engine = create_async_engine(db_url, echo=True)
        self._session_factory = async_sessionmaker(
            self._engine,
            class_=AsyncSession,
            expire_on_commit=False,
        )

    @property
    def session(self):
        return self._session_factory()

    async def __aenter__(self):
        return self

    async def __aexit__(self, *args):
        await self.session.rollback()
        await self.session.close()

    async def commit(self):
        await self.session.commit()

    async def rollback(self):
        await self.session.rollback()