from collections.abc import Generator

from sqlalchemy import create_engine
from sqlalchemy.orm import Session, sessionmaker
from sqlalchemy.pool import StaticPool

from app.core.config import get_settings

settings = get_settings()

_engine_kwargs: dict = {"pool_pre_ping": True, "pool_recycle": 3600}
if settings.is_sqlite:
    _engine_kwargs["connect_args"] = {"check_same_thread": False}
    if settings.database_url.endswith(":memory:") or settings.database_url.endswith("/:memory:"):
        _engine_kwargs["poolclass"] = StaticPool

engine = create_engine(settings.database_url, **_engine_kwargs)

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


def get_db() -> Generator[Session, None, None]:
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()