from typing import Generator
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker

from .settings import get_settings

settings = get_settings()
db_url = settings.database_url
engine_kwargs: dict = {
    "pool_pre_ping": True,
    "pool_recycle": 1800,
    "pool_timeout": settings.db_pool_timeout,
    "future": True,
}
if not str(db_url).startswith("sqlite"):
    engine_kwargs["pool_size"] = settings.db_pool_size
    engine_kwargs["max_overflow"] = settings.db_max_overflow

engine = create_engine(db_url, **engine_kwargs)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine, future=True)

def get_db() -> Generator:
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()