# -*- coding: utf-8 -*-
"""Database Engine & Session – SQLite (lokal) oder PostgreSQL (Produktion)."""

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

from .config import DATABASE_URL
from .core.models import Base

engine = create_engine(
    DATABASE_URL,
    echo=False,
    connect_args={"check_same_thread": False} if "sqlite" in DATABASE_URL else {},
)

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


def init_db():
    """Erstellt alle Tabellen falls sie noch nicht existieren."""
    Base.metadata.create_all(bind=engine)


def get_db() -> Session:
    """Dependency für FastAPI – liefert eine DB-Session pro Request."""
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()