"""Database engine and session configuration."""

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

from app.config import settings

engine = create_engine(
    settings.effective_database_url,
    pool_size=10,
    max_overflow=20,
    pool_pre_ping=True,
    echo=settings.debug,
)

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


class Base(DeclarativeBase):
    """Declarative base for all ORM models."""


def get_db():
    """FastAPI dependency that yields a database session and closes it after use."""
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()