from collections.abc import Generator

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

from app.config import get_settings


class Base(DeclarativeBase):
    pass


def _connect_args(database_url: str) -> dict[str, object]:
    if database_url.startswith("sqlite"):
        return {"check_same_thread": False}
    return {}


settings = get_settings()
engine = create_engine(settings.database_url, connect_args=_connect_args(settings.database_url))
SessionLocal = sessionmaker(bind=engine, autoflush=False, autocommit=False)


def init_db() -> None:
    import app.models  # noqa: F401

    Base.metadata.create_all(bind=engine)


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