from __future__ import annotations

from collections.abc import AsyncGenerator

from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine
from sqlalchemy.orm import sessionmaker
from sqlmodel import SQLModel

from app.core.config import settings

async_engine = create_async_engine(
    settings.MARIADB_DSN,
    echo=settings.DEBUG,
    pool_pre_ping=True,
    pool_size=10,
    max_overflow=20,
)

AsyncSessionLocal = sessionmaker(
    bind=async_engine,
    class_=AsyncSession,
    expire_on_commit=False,
)


async def init_mariadb() -> None:
    async with async_engine.begin() as conn:
        await conn.run_sync(SQLModel.metadata.create_all)


async def close_mariadb() -> None:
    await async_engine.dispose()


async def get_db() -> AsyncGenerator[AsyncSession, None]:
    async with AsyncSessionLocal() as session:
        try:
            yield session
            await session.commit()
        except Exception:
            await session.rollback()
            raise