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

engine = create_async_engine(
    settings.database_url,
    echo=False,
    pool_size=20,
    max_overflow=10,
    pool_pre_ping=True,
)

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


class Base(DeclarativeBase):
    pass


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


async def init_db():
    from .models import provider, channel, user, epg, custom_category, log, notification, jellyfin  # noqa: ensure all models imported
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)