"""
Database connection and session management.
"""

from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker, declarative_base
from app.core.config import get_settings

settings = get_settings()

_engine_kwargs = {"pool_pre_ping": True}
if settings.database_url.startswith("postgresql"):
    _engine_kwargs.update(pool_size=10, max_overflow=20)

engine = create_engine(settings.database_url, **_engine_kwargs)

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

Base = declarative_base()


def get_db():
    """Dependency for getting database session."""
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()