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

from .config import settings

# PostgreSQL: use connection pool; SQLite (dev/test): check_same_thread
connect_args = {}
if settings.database_url.startswith("sqlite"):
    connect_args["check_same_thread"] = False
    engine = create_engine(settings.database_url, connect_args=connect_args)
else:
    engine = create_engine(
        settings.database_url,
        pool_size=10,
        max_overflow=20,
        pool_pre_ping=True,
    )

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


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