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

from app.config import get_settings

settings = get_settings()

engine = create_engine(
    settings.DATABASE_URL,
    echo=settings.DEBUG,
    pool_pre_ping=True,
    pool_size=10,
    max_overflow=20,
    pool_recycle=900,
    pool_timeout=30,
)

SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)


class Base(DeclarativeBase):
    pass


def get_db() -> Generator:
    db = SessionLocal()
    try:
        yield db
        db.commit()
    except Exception:
        db.rollback()
        raise
    finally:
        db.close()