from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker, Session
from config import settings
from models import Base
import logging

logger = logging.getLogger(__name__)

# Create engine with pooling
engine = create_engine(
    settings.database_url,
    pool_size=10,
    max_overflow=20,
    pool_recycle=3600,
    pool_pre_ping=True
)

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

def init_db():
    """Ensure all tables exist in the database."""
    try:
        Base.metadata.create_all(bind=engine)
        logger.info("Database initialized successfully.")
    except Exception as e:
        logger.error(f"Error initializing database: {e}")
        raise

def get_db() -> Session:
    """Dependency for getting DB session."""
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()