from sqlmodel import SQLModel
from sqlmodel.ext.asyncio.session import AsyncSession
from sqlalchemy.ext.asyncio import create_async_engine
from sqlalchemy.orm import sessionmaker
from config import settings

# Create async database engine
# Note: For SQLite, we disable same_thread check as we're in an async context
connect_args = {}
if settings.DATABASE_URL.startswith("sqlite"):
    connect_args = {"check_same_thread": False}

engine = create_async_engine(
    settings.DATABASE_URL,
    echo=False,
    future=True,
    connect_args=connect_args
)

# Async session factory
async_session_maker = sessionmaker(
    engine,
    class_=AsyncSession,
    expire_on_commit=False
)

async def init_db():
    async with engine.begin() as conn:
        # Import models here to make sure they register with SQLModel.metadata
        from models import ModerationLog
        await conn.run_sync(SQLModel.metadata.create_all)

async def get_session():
    async with async_session_maker() as session:
        yield session