import dotenv
dotenv.load_dotenv()

from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
import os
import logging
from sqlalchemy.exc import SQLAlchemyError


engine = create_engine(
    os.getenv("DB_URL"),
    pool_pre_ping=True,
    pool_size=2,        # Reduced from 5
    max_overflow=3,     # Reduced from 10
    pool_recycle=1800,  # Reduced to 30 minutes
    pool_timeout=30,    # Add connection timeout
    echo=False,         # Disable in production - this uses memory
    connect_args={
        "sslmode": "require" if os.getenv("IS_DEV") == "False" else "disable",
        "connect_timeout": 10,  # Connection timeout
        "command_timeout": 60,  # Query timeout
    },
)

Base = declarative_base()  # Base class for ORM models

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


def get_db():
    db = SessionLocal()
    try:
        yield db
        db.commit()  # Explicit commit
    except SQLAlchemyError as e:
        db.rollback()
        logging.error(f"Database error: {e}")
        raise
    except Exception as e:
        db.rollback()
        logging.error(f"Unexpected error: {e}")
        raise
    finally:
        db.close()