"""
SQLAlchemy engine & session factory.
"""

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

from app.config import settings

connect_args = {}
if settings.DATABASE_URL.startswith("sqlite"):
    connect_args = {"check_same_thread": False}

engine = create_engine(
    settings.DATABASE_URL,
    connect_args=connect_args,
    echo=settings.DEBUG,
    pool_pre_ping=True,
)

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


class Base(DeclarativeBase):
    pass


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