from sqlalchemy import create_engine
from sqlalchemy.orm import DeclarativeBase, sessionmaker
from sqlalchemy.pool import StaticPool
from config import settings


class Base(DeclarativeBase):
    pass


_connect_args = {}
_pool_class = None

if settings.database_url.startswith("sqlite"):
    _connect_args = {"check_same_thread": False}
    _pool_class = StaticPool

engine = create_engine(
    settings.database_url,
    connect_args=_connect_args,
    **({"poolclass": _pool_class} if _pool_class else {}),
    echo=settings.debug,
)

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


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


def init_db() -> None:
    from db import models  # noqa: F401 – Modelle müssen importiert sein
    Base.metadata.create_all(bind=engine)