from sqlmodel import SQLModel
from sqlalchemy.ext.asyncio import create_async_engine
from sqlmodel.ext.asyncio.session import AsyncSession
from core.config import get_settings

settings = get_settings()

async_engine = create_async_engine(
    settings.DATABASE_URL,
    echo=False,
    future=True,
    pool_pre_ping=True,
    pool_size=10,  # The number of connections to keep open in the pool
    max_overflow=5, # The number of connections to allow in "overflow"
    pool_timeout=30, # How long to wait for a connection from the pool
)

async def get_db():
    """
    Dependency function to get an async database session.
    Ensures the session is always closed after the request.
    """
    async with AsyncSession(async_engine) as session:
        yield session

async def create_db_and_tables():
    """
    Utility function to create database tables asynchronously.
    """
    async with async_engine.begin() as conn:
        await conn.run_sync(SQLModel.metadata.create_all)