from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker, DeclarativeBase
from typing import Generator

from app.config import get_settings

settings = get_settings()

# Create engine
engine = create_engine(
    settings.DATABASE_URL,
    connect_args={"check_same_thread": False}
    if "sqlite" in settings.DATABASE_URL
    else {},
    echo=settings.DEBUG,
)

# Session factory
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)


class Base(DeclarativeBase):
    pass


def get_db() -> Generator:
    """Dependency for FastAPI to get database session."""
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()