"""
Database connection and session management
"""
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker, Session
from sqlalchemy.pool import NullPool
from app.core.config import get_settings

settings = get_settings()

# Create engine with connection pooling disabled for SQLite compatibility
# In production with PostgreSQL, use QueuePool for better performance
engine = create_engine(
    settings.database_url,
    echo=settings.debug,
    poolclass=NullPool if "sqlite" in settings.database_url else None,
)

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


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